Greenheck Fan Energy Recovery Ventilator ERVe User Manual

Part #473007  
®
Energy Recovery Ventilators  
Installation, Operation and Maintenance Manual  
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the  
product described. Protect yourself and others by observing all safety information. Failure to comply with instructions  
could result in personal injury and/or property damage! Retain instructions for future reference.  
Model ERVe  
General Safety Information  
Only qualified personnel should install this system.  
Personnel should have a clear understanding of these  
instructions and should be aware of general safety  
precautions. Improper installation can result in electric  
shock, possible injury due to coming in contact with  
moving parts, as well as other potential hazards.  
Other considerations may be required if high winds  
or seismic activity are present. If more information  
is needed, contact a licensed professional engineer  
before moving forward.  
1. Follow all local electrical and safety codes, as well  
as the National Electrical Code (NEC), the National  
Fire Protection Agency (NFPA), where applicable.  
Follow the Canadian Electric Code (CEC) in  
Canada.  
2. All moving parts must be free to rotate without  
striking or rubbing any stationary objects.  
3. Unit must be securely and adequately grounded.  
4. Do not spin fan wheel faster than maximum  
cataloged fan RPM. Adjustments to fan speed  
significantly effects motor load. If the fan RPM is  
changed, the motor current should be checked to  
make sure it is not exceeding the motor nameplate  
amps.  
DANGER  
Always disconnect power before working on or near  
this equipment. Lock and tag the disconnect switch  
or breaker to prevent accidental power up.  
5. Do not allow the power cable to kink or come in  
contact with oil, grease, hot surfaces or chemicals.  
Replace cord immediately if damaged.  
CAUTION  
When servicing the unit, the internal components  
may be hot enough to cause pain or injury. Allow  
time for cooling before servicing.  
6. Verify that the power source is compatible with the  
equipment.  
7. Never open access doors to the unit while it is  
running.  
CAUTION  
Precaution should be taken in explosive  
atmospheres.  
Model ERVe Energy Recovery Unit  
1
Table of Contents  
Basic Operation  
Basic Operation . . . . . . . . . . . . . . 3  
Installation  
Supplemental Installation, Operation and  
Maintenance Manuals . . . . . . . . . . . 3  
Installation Concerns. . . . . . . . . . . . 3  
Lifting with a Crane / Forklift. . . . . . . . . 4  
Roof Curb and Rail Mounting  
The ERVe brings in fresh, outdoor air and removes  
stale, exhaust air. Prior to discharging the exhaust  
air, the energy recovery wheel transfers energy from  
the exhaust air to the outdoor air at an effectiveness  
of 70-80%. Simply put, this unit preconditions the  
outdoor air to save money on heating and cooling  
costs.  
Recommended Roof Opening . . . . . . . . 4  
Roof Curb Mounting . . . . . . . . . . . . 5  
Curb Dimensions and Weights . . . . . . . . 5  
Ductwork Connections . . . . . . . . . . . 5  
Rail Mounting / Layout . . . . . . . . . . . 6  
Service Clearances . . . . . . . . . . . . 6  
Access Panel Description and Location . . . 6  
Dimensional Data . . . . . . . . . . . . . 7  
Electrical Information  
Enthalpy Wheel  
Supply Air to Building  
Filters  
Outdoor Air Weatherhood  
Outdoor Air  
Supply  
Blower  
General Electrical Information . . . . . . . . 8  
Control Center Components. . . . . . . . . 9  
Electric Heater Application/Operation . . . . . 9  
Unit Accessories. . . . . . . . . . . . . . 10  
Exhaust Air Damper Installation . . . . . . . 10  
Optional Accessories  
Exhaust Blower  
Return Air from Building  
Filters  
Exhaust Weatherhood  
Exhaust Air  
Frost Control Application/Operation . . . . . 11  
Economizer Application/Operation . . . . . . 12  
Variable Frequency Drives and Wiring . . . .13-14  
Typical Wiring Diagram . . . . . . . . . . . 15  
Sensors and Lights . . . . . . . . . . . . 16  
Remote Control Panel and Wiring . . . . . . 17  
Sensors Mounted by Factory . . . . . . . . 18  
Sequence of Operation  
Supplemental Installation,  
Operation and Maintenance  
Manuals  
Refer to the following Installation, Operation and  
Maintenance Manuals for additional details:  
Part #462844 — Exhaust Weatherhood  
Start-Up  
Unit . . . . . . . . . . . . . . . . . . . 19  
Optional Accessories . . . . . . . . . . . 20  
Fan . . . . . . . . . . . . . . . . . .21-22  
Energy Recovery Wheel . . . . . . . . . . 22  
Routine Maintenance Checklist  
General . . . . . . . . . . . . . . . . . 23  
Fan Belts. . . . . . . . . . . . . . . . . 23  
Fan Motors . . . . . . . . . . . . . . . . 23  
Fan Wheel and Fasteners . . . . . . . . . . 24  
Fan Bearings . . . . . . . . . . . . . . . 24  
Filters . . . . . . . . . . . . . . . . . . 24  
Door Seal Maintenance. . . . . . . . . . . 24  
Energy Recovery Wheel Maintenance  
Installation  
The system design and installation should follow  
accepted industry practice, such as described in the  
ASHRAE Handbook.  
Adequate space should be left around the unit for  
filter replacement and maintenance. Sufficient space  
should be provided on the side of the unit for routine  
service and component removal should that become  
necessary.  
See Service Clearances and Access Panel Description  
sections for more details.  
Accessing Energy Recovery Wheel . . . . . 25  
Removing Energy Recovery Wheel Segments 25  
Cleaning Wheel or Segments . . . . . . . 25  
Wheel Belt . . . . . . . . . . . . . . . 25  
Wheel Bearing . . . . . . . . . . . . . 25  
Parts List . . . . . . . . . . . . . . . . . 26  
Sequence of Operation . . . . . . . . . . . 26  
Troubleshooting – Airflow. . . . . . . . . . 27  
Troubleshooting – Unit . . . . . . . . . 28-29  
Maintenance Log . . . . . . . . . . . 30-31  
Warranty . . . . . . . . . . . . . Backcover  
WARNING  
All factory provided lifting lugs must be used when  
lifting the unit. Failure to comply with this safety  
precaution could result in property damage, serious  
injury or death.  
Model ERVe Energy Recovery Unit  
3
Lifting with a Crane  
1. Before lifting, be sure that all shipping material  
Roof Curb and Rail Mounting  
Recommended Roof Opening  
has been removed from unit.  
2. To assist in determining rigging requirements,  
weights are shown below.  
A
1.63  
1.63  
3. Unit must be lifted by all corner lifting points  
provided on base structure.  
4. Rigger to use suitable mating hardware to attach  
to unit corner lifting points.  
EXHAUST  
INLET  
5. Spreader bar(s) must span the unit to prevent  
damage to the cabinet by the lift cables.  
B
SUPPLY  
OUTLET  
Unit Size  
ERVe-20  
ERVe-35  
ERVe-45  
ERVe-55  
A
B
22  
25  
27  
27  
37  
44.5  
51.5  
60  
All dimensions are in inches.  
6. Always test-lift the unit to check for proper  
balance and rigging before hoisting to desired  
location.  
7. Never lift units by weatherhoods.  
8. Never lift units in windy conditions.  
9. Preparation of curb and roof openings should be  
completed prior to lifting unit to the roof.  
10. Check to be sure that gasketing (supplied by  
others) has been applied to the curb prior to  
lifting the unit and setting on curb.  
Position the unit roof opening such that the supply  
discharge and exhaust inlet of the unit will line up  
with the corresponding ductwork. Be sure to allow  
for the recommended service clearances when  
positioning opening (see Service Clearances).  
Do not face the outdoor air intake of the unit into  
prevailing wind and keep the intake away from any  
other exhaust fans. Likewise, position the exhaust  
discharge opening away from outdoor air intakes of  
any other equipment.  
When cutting only duct openings, cut opening 1-inch  
(25mm) larger than duct size to allow clearance for  
installation. Area enclosed by roof curb must comply  
with clearance to combustible materials. If the roof is  
constructed of combustible materials, area within the  
roof curb must be ventilated, left open, or covered  
with non-combustible material which has an “R”  
value of at least 5. If area within curb is open, higher  
radiated sound levels may result.  
Unit Weights (lbs.)  
Unit Size  
ERVe-20  
ERVe-35  
ERVe-45  
ERVe-55  
Approx. Weight  
825  
1100  
1275  
1550  
The weights shown are a worst case scenario based  
on the sheet metal and component weights for the  
unit. These weights include sheet metal weights  
added together with the largest motors, blowers and  
accessories for the units.  
Where the supply or warm air duct passes thru a  
combustible roof, a clearance of one inch must be  
maintained between the outside edges of the duct  
and combustible material in accordance with NFPA  
Standard 90A.  
Lifting with a Forklift  
Unit base rail includes fork-able lifting locations. Use  
weights shown to determine forklift size requirements.  
Model ERVe Energy Recovery Unit  
4
Roof Curb Mounting  
Curb Outside Dimensions - continued  
Roof curb details including duct location dimensions,  
are available on Roof Curb Assembly Instructions,  
Part Number 472119.  
Unit Side  
Unit Base  
1.895  
Rooftop units require curbs to be mounted first. The  
duct connections must be located so they will be  
clear of structural members of the building.  
1. Factory Supplied Roof Curbs: Roof curbs are  
Model GKD. The GKD ships in a knockdown  
kit (includes duct adapter) and requires field  
assembly (by others). Assembly instructions are  
included with the GKD curbs.  
Insulation Pan  
(Insulation not included)  
4.844  
Roof Curb  
1.549  
2. Install Curb: Locate curb over roof opening and  
fasten in place. (Refer to Recommended Roof  
Openings). Check that the diagonal dimensions  
are within 1/8 inch of each other and adjust  
as necessary. For proper unit operation, it is  
important that the installation be level. Shim as  
required to level.  
3. Install Ductwork: Installation of all ducts should  
be done in accordance with SMACNA and AMCA  
guidelines. Duct adapter provided to support  
ducts prior to setting the unit.  
4. Install Insulation: One-inch deep insulation  
pans were provided with the curb assembly.  
Install insulation prior to setting the unit.  
Insulation is not included from the factory.  
5. Set the Unit: Lift unit to a point directly above  
the curb and duct openings. Guide unit while  
lowering to align with duct openings. Roof curbs  
fit inside the unit base. Make sure the unit is  
properly seated on the curb and is level.  
0.775  
Curb Cap Details for Factory Supplied Roof Curbs  
Ductwork Connections  
Examples of poor and good fan-to-duct connections  
are shown below. Airflow out of the fan  
should be directed straight or curve  
the same direction as  
the fan wheel rotates.  
Poor duct installation  
will result in low airflow  
and other system  
POOR  
effects.  
Length of Straight Duct  
Curb Outside Dimensions and Weights  
GOOD  
Recommended Discharge Duct Size and Length  
Model  
Blower Size Duct Size Straight Duct Length  
ERVe-20  
ERVe-35  
ERVe-45  
ERVe-55  
9
14 x 14  
20 x 20  
20 x 20  
28 x 28  
36  
36  
36  
60  
10  
12  
15  
W
L
All dimensions shown in inches.  
Recommended duct sizes are based on velocities across the  
cfm range of each model at approximately 800 feet per minute  
(FPM) at minimum airflow and up to 1600 fpm at maximum  
airflow. Recommended duct sizes are only intended to be a  
guide and may not satisfy the requirements of the project.  
Refer to plans for appropriate job specific duct size and/or  
velocity limitations.  
Straight duct lengths were calculated based on 100% effective  
duct length requirements as prescribed in AMCA Publication  
201. Calculated values have been rounded up to nearest foot.  
L
LF  
W
WF  
Curb Weight  
(lbs.)  
Unit Size  
L
W
LF  
WF  
ERVe-20  
ERVe-35  
ERVe-45  
ERVe-55  
61.125 40.375 64.875 44.125  
63.375 48.5 67.125 52.25  
67.375 55.5 71.125 59.25  
93  
106  
120  
148  
78.25 65.5  
82  
69.188  
All dimensions are in inches. Weights are for 14-inch high  
GKD type curbs.  
Model ERVe Energy Recovery Unit  
5
Rail Mounting / Layout  
Service Clearances  
• Rails designed to handle the weight of the ERVe  
should be positioned as shown on the diagram  
(rails by others).  
• Make sure that rail positioning does not interfere  
with the supply air discharge opening or the  
exhaust air intake opening on the ERVe unit.  
Avoid area dimensioned “B” below.  
• Rails should extend beyond the unit a minimum  
of 12 inches on each side.  
ERVe units require minimum clearances to perform  
routine maintenance, such as filter replacement,  
energy wheel cassette inspection, and fan belt  
adjustment. Blower and motor assemblies, energy  
recovery wheel cassette and filter sections are always  
provided with a service door  
or panel for proper  
component  
access.  
B
C
• Set unit on rails.  
D
A
D
Recommended Service Clearances  
Unit Size  
A
B
C
D
ERVe-20  
ERVe-35  
ERVe-45  
ERVe-55  
24  
32  
32  
32  
24  
24  
24  
24  
42  
48  
54  
60  
35  
43  
43  
44  
All dimensions are in inches.  
Isometric view of  
ERVe on rails  
Access Panel Description and  
Location  
3
4
2
5
1
B
A
Side view of  
ERVe on rails  
B
Unit Size  
ERVe-20  
ERVe-35  
ERVe-45  
ERVe-55  
A
5.75  
5.75  
6
Outdoor air filters  
Frost control  
Outdoor air sensors  
18  
20.5  
22.5  
26  
1
Preheater and controls  
Outdoor air intake damper  
6
All dimensions are in inches.  
2
3
Supply blower and motor  
Electric control center  
Main disconnect  
Energy wheel cassette  
Exhaust air filters  
Exhaust air intake damper  
4
5
Exhaust blower and motor  
Outdoor air intake damper actuator  
Model ERVe Energy Recovery Unit  
6
Dimensional Data  
D
A
G
RA Intake  
H
SA Discharge  
B
D
C
EA Discharge  
SA Discharge  
E
F
RA Intake  
B
A
OA Intake  
OA Intake  
Exhaust Air  
Weatherhood  
E
Electrical Box  
Duct Dimensions  
B
C
D
F
G
H
Unit Size  
ERVe-20  
ERVe-35  
ERVe-45  
ERVe-55  
A
E
18.0 12.2 10.7 15.8 18.0 10.8 25.8  
20.5 13.7 11.9 21.5 20.5 15.8 27.8  
22.5 16.1 14.0 24.5 22.5 18.8 29.1  
26.0 19.2 16.4 28.0 26.0 23.8 34.8  
11.8  
13.1  
15.8  
18.6  
C
Outdoor Air  
Weatherhood  
All dimensions are in inches.  
Unit Dimensions  
Intake and Discharge Options  
B
C
D
E
Top  
Side  
End  
X
Unit Size  
ERVe-20  
ERVe-35  
ERVe-45  
ERVe-55  
A
Unit Size  
ERVe-20  
ERVe-35  
ERVe-45  
ERVe-55  
Bottom  
67.0  
69.2  
72.2  
84.1  
50.8  
60.8  
67.1  
75.3  
46.3  
54.4  
60.2  
71.4  
17.8  
21.8  
21.8  
21.8  
20.8  
17.8  
19.2  
23.9  
X
X
X
X
X
All dimensions are in inches. Door handles, hinges and  
other protrusions are not included in the dimensions  
above. Dimensions are rounded up to the nearest .1 inch.  
OA - Outdoor Air  
SA - Supply Air (to the space)  
RA - Return Air (from the space)  
EA - Exhaust Air  
Model ERVe Energy Recovery Unit  
7
Electrical Information  
CAUTION  
The unit must be electrically grounded in accordance  
with the current National Electrical Code, ANSI/NFPA  
70. In Canada, use current CSA Standard C22.1,  
Canadian Electrical Code, Part 1. In addition, the  
installer should be aware of any local ordinances or  
electrical company requirements that might apply.  
System power wiring must be properly fused and  
conform to the local and national electrical codes.  
System power wiring is to the unit main disconnect  
(door interlocking disconnect switch standard  
on most units) or distribution block and must be  
compatible with the ratings on the nameplate: supply  
power voltage, phase, and amperage (Minimum  
Circuit Amps - MCA, Maximum Overcurrent Protection  
- MOP). All wiring beyond this point has been done  
by the manufacturer and cannot be modified without  
affecting the unit’s agency / safety certification.  
High voltage wiring is run in the top roof panel(s)  
of this unit. Do not install sensors or other devices  
through the top panel(s).  
WARNING  
To prevent injury or death due to electrocution or  
contact with moving parts, lock disconnect switch  
open.  
Most factory supplied electrical components are  
prewired. To determine what electrical accessories  
require additional field wiring, refer to the unit specific  
wiring diagram located on the inside of the unit  
control center access door. The low voltage control  
circuit is 24 VAC and control wiring should not exceed  
0.75 ohms.  
Refer to Field Control Wiring Length/Gauge table for  
wire length maximums for a given wire gauge.  
If field installing an additional disconnect switch, it  
is recommended that there is at least four feet of  
service room between the switch and system access  
panels. When providing or replacing fuses in a fusible  
disconnect, use dual element time delay fuses and  
size according to the rating plate.  
Field Control Wiring Length/Gauge  
Total  
Wire Length  
Minimum  
Wire Gauge  
125 ft.  
200 ft.  
300 ft.  
450 ft.  
18  
16  
14  
12  
If power supply is desired through bottom of unit, run  
the wiring through the curb, cut a hole in the cabinet  
bottom, and wire to the disconnect switch. Seal  
penetration in cabinet bottom to prevent leakage.  
Control wires should not be run inside the same  
conduit as that carrying the supply power. Make sure  
that field supplied conduit does not interfere with  
access panel operation.  
The electric supply to the unit must meet stringent  
requirements for the system to operate properly.  
Voltage supply and voltage imbalance between  
phases should be within the following tolerances.  
If the power is not within these voltage tolerances,  
contact the power company prior to operating the  
system.  
If wire resistance exceeds 0.75 ohms, an industrial-  
style, plug-in relay should be added to the unit  
control center and wired in place of the remote  
switch (typically between terminal blocks R and G  
on the terminal strip (refer to Typical Control Center  
Components). The relay must be rated for at least  
5 amps and have a 24 VAC coil. Failure to comply  
with these guidelines may cause motor starters to  
“chatter” or not pull in which can cause contactor  
failures and/or motor failures.  
Voltage Supply: See voltage use range on the rating  
plate. Measure and record each supply leg voltage at  
all line disconnect switches. Readings must fall within  
the allowable range on the rating plate.  
Voltage Imbalance: In a 3-phase system, excessive  
voltage imbalance between phases will cause motors  
to overheat and eventually fail. Maximum allowable  
imbalance is 2%. To determine voltage imbalance,  
use recorded voltage measurements in this formula.  
Key:  
V1, V2, V3 = line voltages as measured  
VA (average) = (V1 + V2 + V3) / 3  
VD = Line voltage (V1, V2 or V3) that  
deviates farthest from average (VA)  
Formula: % Voltage Imbalance = [100 x (VA-VD)] / VA  
CAUTION  
If any of the original wire as supplied with the  
appliance must be replaced, it must be replaced  
with wiring material having a temperature rating of  
at least 105ºC.  
Model ERVe Energy Recovery Unit  
8
Typical Control Center Components  
Electric Heater Application/Operation  
Factory installed electric heaters can be provided for  
preheat frost control. An electric preheater warms  
the outdoor air prior to the energy recovery wheel  
to prevent frosting on the wheel. Electric heaters  
are available in 208, 230, or 460 VAC (refer to heater  
nameplate for voltage).  
1. Main Disconnect (non-fusible, lockable)  
2. Motor Starter – Exhaust Air Fan  
3. Motor Starter – Outdoor Air Fan  
4. Motor Contactor – Energy Wheel  
5. 24 VAC Control Transformer  
6. 24 VAC Terminal strip  
7. Fuses for blower motors  
Preheaters: Preheaters are standard as single-stage  
on/off control. Preheaters are single point wired at  
the factory. A thermodisc temperature sensor (with  
a 5°F set point) is mounted in the outdoor airstream  
after the preheater to turn the preheater on. See Frost  
Control Application/Operation for typical set points.  
If the temperature falls below the set point and the  
wheel pressure drop sensor is triggered, the preheater  
will turn on.  
5
1
6
7
Access to the preheater  
control panel is through  
the outdoor air filter  
door.  
2
3
4
Exploded Detail  
of Terminal Strip  
Access to Control Center Components  
is gained through the access panel indicated.  
Model ERVe Energy Recovery Unit  
9
Unit Accessories  
Exhaust Air Damper Installation  
Instructions (bottom return air intake  
configuration only)  
Outdoor Air Weatherhood  
Outdoor air weatherhood will be  
factory mounted.  
1. Open the exhaust air filter and wheel access door.  
Exhaust Weatherhood  
The exhaust weatherhood is  
shipped separately as a kit with  
its own instructions.  
2. Remove exhaust air filters and possibly the energy  
wheel for more working area inside the unit.  
3. Remove the two screws holding the damper in  
place as shown (save screws for step 7).  
Dampers  
Backdraft dampers are always  
included as an integral part of  
the exhaust hood assemblies.  
Motorized outdoor air and exhaust  
air dampers are optional. Outdoor  
air dampers are factory mounted  
and wired at the intake. Exhaust  
air dampers, depending on the  
unit configuration, may require  
final installation. If your unit is  
Shipping Location  
configured as return air intake on  
4. Bend the brackets holding the damper out and  
away from the damper as shown in the Part  
Removal drawing. Use caution while executing this  
step, as the damper is heavy. Guide it into place  
gently and avoid dropping it, as damage may  
occur.  
the end of the unit, the exhaust air damper is factory  
installed and wired. If your unit is configured with  
the return air intake location on the bottom, final  
installation is required per the instructions provided.  
Step 4  
Step 5  
Step 4  
Part Removal  
5. Once the damper is positioned as shown in the  
Part Removal drawing, remove the four (4) screws  
holding the shipping brackets in place.  
6. Remove the shipping brackets and discard.  
7. Insert screws removed in step 3 through the  
damper flange in the same location they were  
removed from.  
Final Installation  
Model ERVe Energy Recovery Unit  
10  
After testing, set the Timer Scale as follows:  
Optional Accessories  
T1 = 10 minutes, T2 = 1 hour  
Frost Control Application/Operation  
Set the Timer Settings as follows:  
T1 = 0.5, T2 = 0.5  
The timer is now set for 5 minutes off and 30  
minutes on. Remember to remove the jumper.  
Extremely cold outdoor air temperatures can cause  
moisture condensation and frosting on the energy  
recovery wheel. Frost control is an optional feature  
that will prevent/control wheel frosting. Three options  
are available:  
Electric preheat frost control includes an electric  
heater (at outdoor air intake), an airflow pressure  
switch and thermodisc temperature sensor (located  
at the preheater) in addition to a pressure sensor  
across the energy wheel. (Refer to Electric Heater  
Application/Operation for electric preheater location).  
When electric preheat frost control is initiated, the  
electric preheater will turn on and warm the air  
entering the energy wheel to avoid frosting. The  
thermodisc temperature sensor installed has a 5°F  
nonadjustable set point. For custom temperature set  
point thermodiscs, please contact the factory. Use the  
following test procedure for troubleshooting.  
1. Timed Exhaust frost control  
2. Electric preheat frost control  
3. Modulating wheel frost control  
All of these options are provided with a thermostat  
(with probe) mounted in the outdoor air intake  
compartment and a pressure sensor to monitor  
pressure drop across the wheel.  
Frost Threshold Temperatures  
Indoor RH @ 70°F  
Frost Threshold Temp  
20%  
30%  
40%  
-10º F  
-5º F  
0º F  
Testing:  
Jumper out the thermodisc temperature sensor  
and the wheel pressure sensor. The heater should  
turn on.  
The typical temperature setting corresponds to the  
indoor air relative humidity as shown in the Frost  
Threshold Temperatures Table and represents when  
frost can occur. An increase in pressure drop would  
indicate that frost is occurring. Both the pressure  
sensor AND the outdoor air temperature sensor  
must trigger in order to initiate frost control. The  
two sensors together ensure that frost control is  
only initiated during a real frost condition. Field  
wiring of a light (or other alarm) between 6 & C in  
the control center will notify personnel when unit is  
in frost control mode (refer to Remote Panel Wiring  
schematics section for wiring details). The following  
explains the three options in more detail.  
If it doesn’t, either put the outdoor air side doors  
on or temporarily jumper the airflow pressure  
switch in the preheater control center to avoid  
nuisance tripping of the pressure switch. Also  
check the airflow switch pressure tap located  
at the supply discharge blower to ensure the  
tubing is connected and the tap is not blocked.  
Remember to remove the jumpers.  
Modulating wheel frost control includes a variable  
frequency drive in addition to the thermostat and  
pressure sensor. When modulating wheel frost control  
is initiated, the variable frequency drive will reduce  
the speed of the wheel. Reducing the speed of the  
energy wheel reduces its effectiveness, which keeps  
the exhaust air condition from reaching saturation,  
thus, eliminating condensation and frosting. If the  
outdoor air temperature is greater than the frost  
threshold temperature OR the pressure differential  
is less than the set point, the wheel will run at full  
speed. If the outdoor air temperature is less than  
the frost threshold temperature AND the pressure  
differential is greater than the set point, the wheel will  
run at reduced speed until the pressure differential  
falls below the set point. The temperature and  
pressure differential set points are set at the factory,  
but are field-adjustable (refer to VFD section for more  
information). The variable frequency drive will be fully  
programmed at the factory.  
Timed exhaust frost control includes a timer in  
addition to the thermostat and wheel pressure sensor.  
When timed exhaust frost control is initiated, the  
timer will turn the supply blower on and off to allow  
the warm exhaust air to defrost the energy recovery  
wheel. Default factory settings are 5 minutes off and  
30 minutes on. Use the following test procedure for  
troubleshooting.  
Testing (refer to Timer Faceplate drawing below)  
Jumper the wheel  
A1  
B1  
15  
pressure switch in the  
unit control center. Set  
the Timer Scale for T1  
and T2 to 1 minute. Set  
the Timer Settings for  
T1 and T2 to 1.0. Set the  
dip switch to the down  
position. (normal position)  
0.8 0.6  
1.0 0.4  
0.2  
Dip  
Switch  
0
T2  
1 MIN T2  
Timer  
Scale  
1 MIN T1  
0.8 0.6  
1.0 0.4  
0.2  
0
T1  
16  
18  
A2  
Turn the temperature  
sensor up as high as  
possible. The supply blower should cycle on for  
one minute, then turn off for one minute.  
Model ERVe Energy Recovery Unit  
11  
should not light and the energy recovery wheel  
should energize and rotate.  
If these steps provide the results described, the  
enthalpy economizer is working properly.  
Economizer Application/Operation  
The energy recovery wheel operation can be altered  
to take advantage of economizer operation (free  
cooling). Two modes are available:  
1. De-energizing the wheel  
2. Modulating the wheel  
Turn unit power off. Reconnect C7400 Solid State  
Enthalpy Sensor to terminal SO.  
A field supplied call for cool (Y1) is required.  
Modulating the Wheel  
In applications in which an internal heat gain is  
present in the space, the rotational speed of the  
energy wheel may be modulated (via variable  
frequency drive) to avoid overheating the space  
during the winter. The speed of the energy wheel  
will be controlled in response to the discharge  
temperature set point.  
De-energizing the wheel is accomplished with a signal  
from a Temperature or Enthalpy sensor mounted  
in the air intake compartment. This primary sensor  
will de-energize the energy wheel when the outdoor  
air temperature (factory default is 65ºF) or enthalpy  
(factory default is the ‘D’ setting) is below the field  
adjustable set point. An Override temperature  
sensor is also furnished in the outdoor air intake  
compartment to deactivate economizer mode. The  
Override (with field adjustable set point) is set at  
some temperature lower than the primary sensor  
(factory default is 50ºF). Effectively, the two sensors  
create a deadband where the energy recovery wheel  
will not operate and free cooling from outside can be  
brought into the building unconditioned.  
Sequence of Operation: The variable frequency  
drive is fully programmed at the factory (refer to VFD  
section for more information). A “call for cool” must  
be field wired to the unit (terminals provided in unit -  
refer to wiring diagram in unit control center) to allow  
for initiation of economizer mode. When the space  
calls for cooling, factory supplied controls will drive  
the following wheel operations:  
Testing  
Wheel runs at full speed.  
TAO > TRA  
Temperature Sensor with Override  
(maximum energy recovery)  
Turn both Temperature and  
Override thermostats down as  
low as they go. The wheel should  
be rotating.  
T
AO < TRA  
and  
Wheel is stopped.  
(no energy recovery)  
T
AO > TSA  
TAO < TRA  
and  
T
Wheel will modulate to maintain  
discharge temperature.  
Turn the Temperature sensor  
up as high as it goes, and keep  
the Override sensor as low as it  
will go. The wheel should stop  
rotating.  
Temperature  
Sensor with  
Override  
AO < TSA  
Where (T ) is the outdoor air temperature set point,  
(T ) is the return air temperature set point, and (T  
OA  
)
RA  
SA  
Turn both sensors as high as they will go. The  
wheel should start rotating.  
is the supply air discharge thermostat set point.  
Set the Temperature sensor at desired point  
for economizer operation to begin. Set the  
Override sensor at desired point for economizer  
operation to end (factory default is 65ºF and 50ºF,  
respectively).  
Enthalpy Sensor with Override  
Turn unit power off. Disconnect  
C7400 Solid State Enthalpy Sensor  
from terminal So on the enthalpy  
controller. Also, disconnect the  
620 ohm resistor from  
terminal Sr on the  
enthalpy controller.  
Turn unit power on. The  
LED on the enthalpy  
Enthalpy  
Sensor with  
Override  
controller should light and the energy  
recovery wheel should not rotate.  
Turn unit power off. Reconnect 620  
ohm resistor to terminal Sr on the  
enthalpy controller. Turn unit power  
on. The LED on the enthalpy controller  
Enthalpy  
Controller  
Model ERVe Energy Recovery Unit  
12  
Variable Frequency Drives for Energy Recovery Blowers  
Optional factory installed, wired, and programmed variable frequency drives (VFDs) may have been provided  
for modulating or multispeed control of the blowers. One VFD is provided for each blower (supply air and  
exhaust). The VFD’s provided are either Yaskawa model V1000 or J1000. Refer to the tables in this section for  
factory settings and field wiring requirements. Refer to the unit control center for unit specific wiring diagram (an  
example wiring diagram has been provided in this manual for reference). When making adjustments outside of  
For technical support, contact Yaskawa direct at 1-800-927-5292.  
R+ R- S+ S- IG  
P1 P2 PC A1 A2 +V AC AM AC MP  
S1 S2 S3 S4 S5 S6 S7 HC SC H1 RP MA MB MC  
S1 S2 S3 S4 S5 SC A1 +V AC AM AC  
MA MB MC  
J1000  
V1000  
Factory Set Points  
Variable Frequency Drives (VFDs) for the blowers are  
factory setup to operate in one of the three following  
modes:  
OPTION 1 - 0-10 VDC CONTROL  
USER TO PROVIDE ISOLATION AS REQUIRED  
Modulating: 0-10 VDC signal wired in the field by  
others varies the speed of the blower between 30  
and 60Hz  
0-10 VDC CONTROL SIGNAL (BY OTHERS)  
WIRED TO A1 (+) AND AC (COMMON)  
0 VDC=30 Hz  
A1 AC  
10 VDC=60 Hz  
Multispeed: Digital contact closures by others  
command the VFD to run at multiple speed settings:  
• SC to S4 - Drive runs at 40Hz  
FOR ONE 0-10 SIGNAL, WIRE TO DRIVES IN PARALLEL  
SEE VFD INSTALLATION MANUAL FOR MORE DETAIL  
• SC to S5 - Drive runs at 30Hz  
FOR CONTINUOUS 60Hz OPERATION JUMPER TERMINALS A1 AND +V.  
CO Sensor: A digital contact closure from an  
2
optional factory provided CO sensor sends the  
2
VFD to high or low speed depending on CO ppm  
levels at the sensor.  
2
OPTION 2 - MULTI SPEED CONTROL  
USER TO PROVIDE CONTACTS AND ISOLATION  
AS REQUIRED  
The terminal locations for Modulating (option 1) and  
Multi-speed (option 2) are shown on the left. Most  
of the set points in the VFDs are Yaskawa factory  
defaults. However, a few set points are changed at  
Greenheck and are shown in the tables on the next  
page. These settings are based on the VFD mode  
selected.  
To gain access to change set points on the V1000 and  
J1000 drives, parameter A1-01 needs to be set at “2”.  
To prevent access or tampering with drive settings on  
either drive, change parameter A1-01 to “0”.  
NEITHER S4 OR S5 CONTACT CLOSED  
S4 S5 SC  
DRIVE SPEED = 60 Hz.  
S4 TO SC CONTACT CLOSED (BY OTHERS)  
DRIVE SPEED = 40 Hz.  
S5 TO SC CONTACT CLOSED (BY OTHERS)  
DRIVE SPEED = 30 Hz.  
SEE VFD INSTALLATION MANUAL FOR MORE DETAIL  
TO CHANGE THE FACTORY SET Hz CHANGE THE FOLLOWING PARAMETERS.  
PARAMETER A1-01 CHANGE TO 2  
PARAMETER d1-01 FOR NEW 60Hz SETTING  
PARAMETER d1-02 FOR NEW 40Hz SETTING  
PARAMETER d1-03 FOR NEW 30Hz SETTING  
PARAMETER A1-01 CHANGE TO 0  
Drive Operation  
SC to S1 contact for On/Off  
A1 (0-10 VDC) referenced to AC. Can use +15 VDC  
from +V  
Model ERVe Energy Recovery Unit  
13  
Factory Set Points - continued  
CO SENSOR CONTROL FOR FAN SPEED  
2
Resetting the V1000 drive to factory defaults  
To reset the V1000 drive back to Greenheck factory  
defaults go to parameter A1-01 and set it to “2”.  
Then go to A1-03 and change it to “1110” and press  
enter. The drive is now reset back to the settings  
programmed at Greenheck. This option is not  
available on the J1000.  
(1/2 SPEED WHEN C0 DROPS bELOW 700 PPM)  
2
(FULL SPEED WHEN C0 RISES AbOVE 800 PPM)  
2
Setting  
Parameter  
V1000  
J1000  
A1-01  
Access Level  
2
0
1
2
0
1
b1-01 Reference Source (Frequency)  
b1-17  
C1-01  
C1-02  
C6-02  
d1-01  
d1-02  
d2-02  
VFD Start-Up Setting  
Acceleration Time  
Deceleration Time  
Carrier Frequency  
30 sec. 30 sec.  
30 sec. 30 sec.  
MODULATING CONTROL FOR FAN SPEED  
(0-10 VDC)  
1
1
Setting  
Parameter  
Frequency Reference 1  
Frequency Reference 2  
Ref Lower Limit  
60 Hz  
30 Hz  
50%  
30 Hz  
60 Hz  
50%  
V1000  
J1000  
A1-01  
b1-17  
C1-01  
C1-02  
C6-02  
d2-02  
Access Level  
VFD Start-Up Setting  
Acceleration Time  
Deceleration Time  
Carrier Frequency  
Ref Lower Limit  
2
1
2
1
Motor  
FLA  
Motor  
FLA  
30 sec. 30 sec.  
30 sec. 30 sec.  
E2-01  
Motor Rated FLA  
H3-10  
A1-01  
A2 Not Used  
Access Level  
F
0
NA  
0
1
1
50%  
Motor  
FLA  
50%  
Motor  
FLA  
Variable Frequency Drives for Energy  
Recovery Wheel  
E2-01  
Motor Rated FLA  
H3-04  
A1-01  
Terminal A1 Bias  
Access Level  
50%  
50%  
Optional factory installed VFD for the energy recovery  
wheel is programmed at the factory per the settings  
shown below for economizer and frost control modes.  
The VFD provided is a Yaskawa model J1000. Refer  
to the VFD instruction manual that ships with the unit  
when making adjustments.  
0
0
MULTI-SPEED CONTROL FOR FAN SPEED  
(1/3 OR 1/2 SPEED REDUCTION)  
Setting  
Parameter  
Parameter  
Access Level  
Setting – J1000  
V1000  
J1000  
A1-01  
b1-17  
C6-02  
d2-01  
d2-02  
E2-01  
2
A1-01  
Access Level  
2
0
1
2
0
1
VFD Auto Start  
Carrier Frequency  
Ref Upper Limit  
Ref Lower Limit  
Motor Rated FLA  
1
b1-01 Reference Source (Frequency)  
2
40% or 50%*  
5%  
b1-17  
C1-01  
C1-02  
C6-02  
d1-01  
d1-02  
d1-03  
d1-04  
d2-02  
VFD Start-Up Setting  
Acceleration Time  
30 sec. 30 sec.  
30 sec. 30 sec.  
Deceleration Time  
Motor FLA  
Must be less  
than FLA  
Carrier Frequency  
1
1
E2-03  
H1-02  
H2-01  
Motor No-Load Current  
Frequency Reference 1  
Frequency Reference 2  
Frequency Reference 3  
Frequency Reference 4  
Ref Lower Limit  
60 Hz  
40 Hz  
30 Hz  
60 Hz  
50%  
60 Hz  
40 Hz  
30 Hz  
60 Hz  
50%  
Multi-Function Input  
(Terminal S2)  
Multi-Function Output  
(MA, MB, MC)  
6
5
Setting  
Motor  
FLA  
Motor  
FLA  
Economizer Signal Source  
(0-10 VDC)  
E2-01  
H1-04  
H1-05  
H1-06  
Motor Rated FLA  
Honeywell  
Carel  
Module Controller  
Multi-Function Input Sel 4  
(Terminal S4)  
3
4
5
3
4
Analog Frequency Reference  
H3-03  
0
100  
0
(Gain)  
Multi-Function Input Sel 5  
(Terminal S5)  
Analog Frequency Reference  
H3-04  
(Bias)  
99  
Multi-Function Input Sel 6  
(Terminal S6)  
NA  
L1-01  
L4-01  
A1-01  
Elect Thermal Overload  
Frequency Detection Level  
Access Level  
2
15  
0
H3-10  
A1-01  
A2 Not Used  
Access Level  
F
0
NA  
0
*30 through 64 inch wheels are 40% (24 Hz)  
74 inch wheel is 50% (30 Hz)  
Model ERVe Energy Recovery Unit  
14  
Typical Wiring Diagram  
Following is an example of a typical wiring diagram located in the unit control center. This wiring diagram  
includes a legend highlighting which accessories were provided with the unit. Factory wiring and field wiring  
are also indicated. This particular example includes 1) variable frequency drives on the blowers requiring a  
modulating input, 2) modulating energy recovery wheel with factory controls for economizer, 3) energy recovery  
wheel rotation sensor, 4) outdoor air and exhaust air dirty filter switches, 5) motorized outdoor air and exhaust  
air intake dampers, and 6) timed exhaust frost control. Many other factory installed and wired accessories are  
available.  
DS1  
L1  
T1  
T2  
T3  
L1  
VFD-E  
MAIN POWER  
TO UNIT  
L2  
L3  
LEGEND  
L2  
L3  
S1 SC FR FC  
R3  
CC COMPRESSOR CONTACTOR  
CF CONDENSING FAN CONTACTOR  
CH COMPRESSOR SUMP HEATER  
EXHAUST FAN  
MOTOR  
GROUND  
1
3
0-10 VDC  
D
DAMPER  
*
T1  
T2  
T3  
L1  
VFD-S  
DB POWER DISTRIBUTION BLOCK  
DL DAMPER LIMIT SWITCH  
DS DISCONNECT SWITCH  
EC ECONOMIZER CONTROLLER  
FCS CONDENSOR FAN CYCLE SWITCH  
FU FUSES  
L2  
L3  
*
*
S1 SC FR FC  
R4  
SUPPLY FAN  
MOTOR  
1
3
0-10 VDC  
FU5 CONTROL TRANSFORMER FUSES (NOT ON CLASS II)  
FZ1 FREEZE PROTECTION  
HPS HIGH PRESSURE SWITCH (MANUAL RESET)  
LPS LOW PRESSURE SWITCH  
PS1 WHEEL FROST PRESSURE SWITCH  
PS2 SUPPLY DIRTY FILTER PRESSURE SWITCH  
PS3 EXHAUST DIRTY FILTER PRESSURE SWITCH  
R1 ENERGY WHEEL RELAY/CONTACTOR  
R2 OCCUPIED/UNOCCUPIED RELAY  
R3 EXHAUST BLOWER VFD RELAY  
R4 SUPPLY BLOWER VFD RELAY  
R5 MODULATING WHEEL FROST CONTROL RELAY  
R6 ECONOMIZER RELAY  
*
L1  
L2  
L3  
S1  
T1  
T2  
T3  
VFD-W  
*
*
*
*
ENERGY WHEEL  
SC  
FR FC MA MC  
R1  
SEE BELOW FOR  
TERMINAL CONNECTIONS  
3
4
*
*
FU5  
TR1  
R7 COMPRESSOR INTERLOCK RELAY  
R8 EVAP RELAY (INDIRECT)  
R9 EVAP RELAY (DIRECT)  
R10 UNIT RELAY  
S1 FAN SWITCH  
S2 ROTATION SENSOR REED SWITCH  
S3 ROTATION SENSOR REED SWITCH  
S4 CALL FOR HEAT SWITCH  
MULTI-VOLTAGE PRIMARY  
24 SECONDARY  
o
*
R
C
S5 BYPASS SWITCH  
o
S6 CALL FOR COOL SWITCH (FIRST STAGE)  
S7 CALL FOR COOL SWITCH (SECOND STAGE)  
ST MOTOR STARTER  
T1 FROST CONTROL TIMER  
TYPICAL SETTINGS t1(OFF) = 5 MIN., t2(ON) = 30 MIN.  
T2 ROTATION SENSOR TIMER  
*
*
S1  
EXHAUST DAMPER  
D1  
R3  
G
*
T3 ROTATION SENSOR TIMER  
T4 ECONOMIZER WHEEL JOG TIMER  
TYPICAL SETTINGS t1(OFF) = 3 HRS., t2(ON) = 10 SEC.  
T5 EVAP DELAY OFF TIMER  
VFD-E O.L.  
MB MC  
EXHAUST FAN  
2
7
T6 COMPRESSOR MINIMUM OFF TIMER (TYP. 3 MIN.)  
T7 COMPRESSOR MINIMUM OFF TIMER (TYP. 3 MIN.)  
TR TRANSFORMER  
TS1 FROST CONTROL THERMOSTAT (JUMPER - HEAT )  
CLOSES ON TEMP. DECREASE TYPICAL SETTING 5 F.  
*
*
SUPPLY DAMPER  
D2  
R4  
R1  
4
º
TS2 ECONOMIZER LOW LIMIT THERMOSTAT (JUMPER - HEAT )  
VFD-S O.L.  
R3  
T1  
º
º
OPENS ON TEMP. DECREASE TYP. SETTING 20 OFFSET OR 50 F.  
SUPPLY FAN  
TS3 ECONOMIZER UPPER LIMIT THERMOSTAT (JUMPER - HEAT)  
6
8
16  
2
7
15  
MB  
MC  
º
º
CLOSES ON TEMP. DECREASE TYP. SETTING 65 F./2 DIFF.  
TS4 ROOM OVERRIDE SENSOR  
TS5 INLET AIR POST HEATER LOCKOUT THERMOSTAT (AFTER WHEEL)  
CLOSES ON TEMP. DECREASE TYPICAL SETTING 65 F.  
TS6 INLET AIR COMPRESSOR LOCKOUT THERMOSTAT (JUMPER-HEAT)  
OPENS ON TEMP. DECREASE TYPICAL SETTING 60 F./2 DIFF.  
ENERGY WHEEL  
ROTATION SENSOR  
º
A2  
A1  
TO MA AND MC  
ON VFD-W  
MA  
º
º
MC  
1
C
S2  
T2  
6
2
NC  
12  
FACTORY SUPPLIED AND WIRED  
*
o
FIELD WIRED  
OA-SENSOR  
SENSOR  
FIELD CONTROL WIRING RESISTANCE SHOULD NOT EXCEED 0.75 OHM. IF  
RESISTANCE EXCEEDS 0.75 OHM THEN CONSULT FACTORY. USE 14 GAUGE  
MINIMUM WIRE THICKNESS FOR CONTROL WIRING.  
24 VAC  
THERMOSTAT(S) TS1,  
COM  
THERMOSTAT CONTROLLER(S)  
FROST CONTROL  
B1  
PS1  
NO  
TS1  
REPLACEMENT FUSES: MUST HAVE A MINIMUM I.R. RATING OF 5 KA  
6
T1  
C
COM  
NO  
A1  
A2  
CAUTION:  
UNIT SHALL BE GROUND IN ACCORDANCE WITH N.E.C.  
POWER MUST BE OFF WHILE SERVICING.  
S6  
Y1  
ECONOMIZER CONTROL  
TR  
1
TR1  
EC  
+
-
FR  
FC  
TO FR AND FC  
ON VFD-W  
2-10V  
USER INTERFACE CONNECTIONS:  
SR  
SR+  
SO  
SO+  
T
T1  
620 OHM RESISTOR OR  
RETURN AIR SENSOR  
USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.  
DIRTY FILTER INDICATOR SHOWN AS 24V POWER FROM UNIT.  
PS2  
OUTDOOR AIR  
SENSOR  
5
2
MIXED AIR  
SENSOR  
C
NC  
NO  
SUPPLY DIRTY  
FILTER SWITCH  
R
C
PS3  
4
3
C
NC  
NO  
EXHAUST DIRTY  
FILTER SWITCH  
R
C
C
FROST CONTROL INDICATOR  
ROTATION INDICATOR  
6
12  
C
Model ERVe Energy Recovery Unit  
15  
Rotation Sensor  
CO Sensor  
2
The rotation sensor monitors energy recovery wheel  
rotation. If the wheel should stop rotating, the sensor  
will close a set of contacts in the unit control center.  
Field wiring of a light (or other alarm) between  
terminals R & 12 in the unit control center will notify  
maintenance personnel when a failure has occurred.  
(Refer to Remote Panel Wiring Schematics section for  
wiring details).  
This accessory is often used to provide a modulating  
control signal to a variable frequency drive to raise  
and lower airflow in relationship to the CO levels  
2
in the space. This strategy is often referred to as  
Demand Control Ventilation and provides further  
energy savings to the system. Follow instructions  
supplied with sensor for installation and wiring details.  
Service Outlet  
Dirty Filter Sensor  
120 VAC GFCI service outlet ships  
loose for field installation. Requires  
separate power source so power is  
available when unit main disconnect is  
turned off for servicing.  
Dirty filter sensors monitor pressure drop across the  
outdoor air filters, exhaust air filters or both. If the  
pressure drop across the filters exceeds the set point,  
the sensor will close a set of contacts in the unit  
control center. Field wiring of a light (or other alarm)  
to these contacts will notify maintenance personnel  
when filters need to be replaced.  
Vapor Tight Lights  
Vapor tight lights provide light to each of the  
compartments in the energy  
The switch has not been set at the factory due to  
external system losses that will affect the switch. This  
switch will need minor field adjustments after the unit  
has been installed with all ductwork complete. The  
dirty filter switch is mounted in the unit control center.  
recovery unit. The lights are wired  
to a junction box mounted on the  
outside of the unit. The switch to  
turn the lights on is located in the  
unit control center. The switch  
requires a separate power source  
to allow for power to the lights  
when the unit main disconnect is  
off for servicing.  
To adjust the switch, the unit must be running with  
all of the access doors in place. The adjusting  
screw is located on the top of the switch. Open the  
filter compartment and place a sheet of plastic or  
cardboard over 50% of the filter media. Replace  
the filter compartment door. Check to see if there is  
power at the alert signal leads. (Refer to electrical  
diagram).  
Whether there is power or not, turn the adjustment  
screw on the dirty filter gauge (clockwise if you did  
not have power, counterclockwise if you did have  
power) until the power comes on or just before the  
power goes off. Open the filter compartment and  
remove the obstructing material. Replace the door  
and check to make sure that you do not have power  
at the alert signal leads. The unit is now ready for  
operation.  
Setscrew (on front of switch) must  
be manually adjusted after the  
system is in operation.  
Negative pressure connection  
is toward the ‘front or top’ of  
the switch. (senses blower side  
of filters)  
Positive pressure connection is toward the ‘back or  
bottom’ of the switch. (senses air inlet side of filters)  
Model ERVe Energy Recovery Unit  
16  
Indicator Lights powered by the ER Unit  
Remote Control Panel and Wiring  
Schematics  
The remote panel is a series of junction boxes ganged  
together and includes a stainless steel faceplate. The  
remote panel is available with a number of different  
alarm lights and switches to control the unit. The  
remote panel ships loose and requires mounting and  
wiring in the field  
R
C
Unit On/Off  
G
Y1  
Y2  
W1  
Frost Control  
6
Economizer  
Rotation Sensor  
7
The remote panel is available with the following  
options:  
12  
• Unit on/off switch  
• Unit on/off light  
PS2  
NC  
C
NO  
Supply Dirty Filter  
Exhaust Dirty Filter  
• 7-day time clock  
• Hand/off/auto switch  
• Time delay override  
• Economizer light  
PS3  
NC  
C
NO  
• Frost control light  
• Exhaust air dirty filter light  
• Outdoor air dirty filter light  
• Wheel rotation sensor light  
Refer to Electrical Connections section for Field Control  
Wiring recommendations.  
Dirty Filter Indicator (power by others)  
7-Day Timer or On/Off Switch  
PS2  
Supply Dirty Filter  
Exhaust Dirty Filter  
NC  
C
NO  
7-Day Timer  
R
PS3  
Terminal Block  
NC  
C
NO  
C
G
in Unit  
Control Center  
S1 - Unit On/Off  
Hot  
L1  
Refer to Pressure Switch for voltage and load ratings.  
For 7-Day Timer, use blue and black wires.  
Red wires should be capped off.  
Hand/Off/Auto Switch  
R
Terminal Block  
C
G
in unit  
On  
Control Center  
Off  
Auto  
BMS  
Hand/Off/Auto Switch allows the unit to  
“Off” - off  
“On” - Manual Operation  
“Auto” - Unit is controlled by BMS, RTU, etc.  
NOTE: RTU controllers are by others.  
Model ERVe Energy Recovery Unit  
17  
Sensors Mounted by Factory  
Factory mounted temperature, pressure, and current sensors are available in the locations indicated on the unit  
diagram below. A list of available sensors is shown below. The specific sensors provided on a given unit are  
labeled in the unit control center on the terminal strip. Sensors are wired to the terminal strip to make it easy for  
the controls contractor to connect the Building Management System for monitoring purposes.  
EW-P  
RAF-P  
EF-A  
EAW  
RAI  
RA  
FILTER  
TO  
OUTSIDE  
FROM  
INSIDE  
EXHAUST  
BLOWER  
OAF-P  
OAI  
OAAW  
OAF-A  
OA  
FILTER  
FROM  
OUSTIDE  
TO  
INSIDE  
SUPPLY  
BLOWER  
OAD  
OAW-P  
Temperature Sensors - 1K Ohm RTD  
Drawing Labels Terminal Strip Labels  
OAI  
OA/Supply Inlet Temp  
OA After Wheel  
OAAW  
RAI  
RA/Exhaust Inlet Temp  
Supply Discharge Temp  
Exhaust After Wheel Temp  
OAD  
EAW  
Pressure Sensors (analog or digital)  
Drawing Labels Terminal Strip Labels  
OAF-P  
OAW-P  
RAF-P  
EW-P  
OA/Supply Filter Pressure  
Outdoor Air Wheel Pressure  
RA/Exhaust Filter Pressure  
Exhaust Wheel Pressure  
Amp - Current Sensors (analog or digital)  
Drawing Labels Terminal Strip Labels  
OAF-A  
EF-A  
Supply Fan Amps  
Exhaust Fan Amps  
Model ERVe Energy Recovery Unit  
18  
o Rotate the fan wheels and energy recovery wheels  
by hand and ensure no parts are rubbing. If  
rubbing occurs, refer to Start-Up section for more  
information.  
Start-Up  
DANGER  
Electric shock hazard. Can cause injury or death.  
Before attempting to perform any service or  
maintenance, turn the electrical power to unit  
to OFF at disconnect switch(es). Unit may have  
multiple power supplies.  
o Check the fan belt drives for proper alignment  
and tension (refer to Start-Up section for more  
information).  
o Filters can load up with dirt during building  
construction. Replace any dirty pleated filters and  
clean the aluminum mesh filters in the intake hood  
(refer to Routine Maintenance section).  
WARNING  
Use caution when removing access panels or other  
unit components, especially while standing on a  
ladder or other potentially unsteady base. Access  
panels and unit components can be heavy and  
serious injury may occur.  
o Verify that non-motorized dampers open and close  
properly.  
o Check the tightness of all factory wiring  
connections.  
Do not operate energy recovery ventilator without  
the filters and birdscreens installed. They prevent  
the entry of foreign objects such as leaves, birds,  
etc.  
o Verify control wire gauge (refer to the Electrical  
Connections section).  
o Verify diameter seal settings on the energy  
recovery wheel (refer to Start-Up section for more  
information).  
CAUTION  
o Install exhaust inlet motorized damper (see Unit  
Do not run unit during construction phase. Damage  
to internal components may result and void  
warranty.  
Accessories section)  
SPECIAL TOOLS REQUIRED  
• Voltage Meter (with wire probes)  
• Amperage Meter  
• Thermometer  
Tachometer  
• Incline manometer or equivalent  
General Start-Up Information  
Every installation requires a comprehensive start-  
up to ensure proper operation of the unit. As part  
of that process, the following checklist must be  
completed and information recorded. Starting up  
the unit in accordance with this checklist will not  
only ensure proper operation, but will also provide  
valuable information to personnel performing future  
maintenance. Should an issue arise which requires  
factory assistance, this completed document  
will allow unit experts to provide quicker resolve.  
Qualified personnel should perform start-up to ensure  
safe and proper practices are followed.  
Start-Up Checklist  
The unit will be in operational mode during start-up.  
Use necessary precautions to avoid injury. All data  
must be collected while the unit is running. In order to  
measure volts & amps, the control center door must  
be open, and the unit energized using a crescent  
wrench to turn the disconnect handle.  
Check line voltage at unit disconnect  
_______ L1-L2 volts  
Unit Model Number _______________________________  
(e.g. ERVe-20)  
_______ L2-L3 volts  
_______ L1-L3 volts  
Unit Serial Number _______________________________  
(e.g. 10111000)  
Motor Amp Draw  
Energy Wheel Date Code __________________________  
(e.g. 0450)  
• Supply Fan  
• Exhaust Fan  
_______ L1 amps  
_______ L2 amps  
_______ L3 amps  
______ L1 amps  
______ L2 amps  
______ L3 amps  
Start-Up Date  
_______________________________  
Start-Up Personnel Name__________________________  
Start-Up Company _______________________________  
• Energy Wheel  
Phone Number  
_______________________________  
_______ L1 amps  
_______ L2 amps  
_______ L3 amps  
Pre Start-Up Checklist – check as items are  
completed.  
o Disconnect and lock-out all power switches  
Fan RPM  
o Remove any foreign objects that are located in the  
_______ Supply Fan ______ Exhaust Fan  
energy recovery unit.  
Correct fan rotation direction  
o Check all fasteners, set-screws, and locking collars  
on the fans, bearings, drives, motor bases and  
accessories for tightness.  
Supply Fan  
Exhaust Fan  
Yes / No  
Yes / No  
Model ERVe Energy Recovery Unit  
19  
Optional Accessories Checklist  
Refer to the respective sections in this Installation, Operation and Maintenance Manual for detailed information.  
Refer to wiring diagram in unit control center to determine what electrical accessories were provided.  
Provided with Unit? Frost Control Application / Operation section:  
Setting  
Factory Default  
Yes  
Yes  
No  
No  
Frost Control set point  
Differential  
5ºF  
2ºF  
Timer  
Refer to IOM  
Refer to IOM  
Frost Control Modulating  
Economizer Application / Operation section:  
Yes  
No  
Economizer (temperature)  
Set point  
65ºF  
20ºF  
2ºF  
Offset  
Differential  
Yes  
Yes  
No  
No  
Economizer (enthalpy)  
Set point  
D
Economizer (modulating)  
Refer to IOM  
Optional Accessories section:  
Operational  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
No  
No  
No  
No  
No  
No  
No  
Wheel Rotation Sensor  
OA Dirty Filter Sensor  
EA Dirty Filter Sensor  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
No  
No  
No  
No  
No  
No  
No  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
CO Sensor  
2
Service Outlet  
Vapor Tight Lights  
Remote Control Panel  
Variable Frequency Drives section:  
Operational  
Yes  
Yes  
No  
No  
Blower VFDs  
Wheel VFD  
Yes  
Yes  
No  
No  
N/A  
N/A  
Damper section:  
Operational  
Yes  
Yes  
No  
No  
Outdoor Air Damper  
Exhaust Air Damper  
Yes  
Yes  
No  
No  
N/A  
N/A  
Model ERVe Energy Recovery Unit  
20  
5. Place belts over sheaves. Do not pry or force  
belts, as this could result in damage to the cords  
in the belts.  
Unit Start-Up  
Refer to Parts List section for component locations.  
Fans  
6. With the fan off, adjust the belt tension by moving  
the motor base. (See belt tensioning procedures in  
the Routine Maintenance section of this manual).  
When in operation, the tight side of the belts  
should be in a straight line from sheave to sheave  
with a slight bow on the slack side.  
The ERVe models contain  
two forward curved (supply &  
exhaust) fans. These forward  
curved fans should be checked  
for free rotation. If any binding  
occurs, check for concealed  
damage and foreign objects  
in the fan housing. Be sure to  
check the belt drives per the  
start-up recommendations in  
the following section.  
Forward Curved  
Exhaust Fan  
WRONG  
WRONG  
WRONG  
CORRECT  
CAUTION  
Direction of Fan Wheel Rotation  
When operating conditions of the fan are to be  
changed (speed, pressure, temperature, etc.),  
consult Greenheck to determine if the unit can  
operate safely at the new conditions.  
Blower access is labeled on unit. Check for proper  
wheel rotation by momentarily energizing the fan.  
Rotation is determined by viewing the wheel from the  
drive side and should match the rotation decal affixed  
to the fan housing (see Rotation Direction figures).  
If the wheel is rotating the wrong way, direction can  
be reversed by interchanging any two of the three  
electrical leads. Check for unusual noise, vibration, or  
overheating of bearings. Refer to the Troubleshooting  
section of this manual if a problem develops.  
Fan Performance Modifications  
Due to job specification revisions, it may be  
necessary to adjust or change the sheave or pulley to  
obtain the desired airflow at the time of installation.  
Start-up technician must check blower amperage  
to ensure that the amperage listed on the motor  
nameplate is not exceeded. Amperage to be tested  
with access doors closed and ductwork installed.  
Airflow  
Fan Belt Drives  
The fan belt drive components, when supplied by  
Greenheck, have been carefully selected for the  
unit’s specific operating condition. Utilizing different  
components than those supplied could result in  
unsafe operating conditions which may cause  
personal injury or failure of the following components:  
Forward Curved  
Fan RPM  
Supply fan and exhaust fan will have an adjustable  
motor pulley (on 15 HP and below) preset at the  
factory to the customer specified RPM. Fan speed  
can be increased or decreased by adjusting the pitch  
diameter of the motor pulley. Multigroove variable  
pitch pulleys must be adjusted an equal number  
of turns open or closed. Any increase in fan speed  
represents a substantial increase in load on the  
motor. Always check the motor amperage reading  
and compare it to the amperage rating shown on the  
motor nameplate when changing fan RPM. All access  
doors must be installed except the control center  
door. Do not operate units with access doors open or  
without proper ductwork in place as the fan motors  
will overload.  
• Fan Shaft  
• Fan Wheel  
• Bearings  
• Belt  
• Motor  
Tighten all fasteners and set screws securely and  
realign drive pulleys after adjustment. Check pulleys  
and belts for proper alignment to avoid unnecessary  
belt wear, noise, vibration and power loss. Motor and  
drive shafts must be parallel and pulleys in line (see  
diagrams in this section).  
Belt Drive Installation  
1. Remove the protective coating from the end of  
the fan shaft and assure that it is free of nicks and  
burrs.  
2. Check fan and motor shafts for  
parallel and angular alignment.  
3. Slide sheaves on shafts. Do not  
drive sheaves on as this may  
result in bearing damage.  
4. Align fan and motor sheaves  
with a straight-edge or  
string and tighten.  
Model ERVe Energy Recovery Unit  
21  
Vibration  
Drive Belt  
Inspect the drive belt. Make sure the belt rides  
smoothly through the pulley and over the wheel rim.  
Excessive vibration may be experienced during initial  
start-up. Left unchecked, excessive vibration can  
cause a multitude of problems, including structural  
and/or component failure. The most common sources  
of vibration are listed.  
Air Seals  
Check that the air seals located around the outside of  
the wheel and across the center (both sides of wheel)  
are secure and in good condition. Air seal clearance  
is determined by placing a sheet of paper, to act as a  
feeler gauge, against the wheel face. To access seals,  
follow the instructions in the Energy Recovery Wheel  
Maintenance section. To adjust the air seals, loosen  
all eight seal retaining screws. These screws are  
located on the bearing support that spans the length  
of the cassette through the wheel center. Tighten the  
screws so the air seals tug slightly on the sheet of  
paper.  
Many of these conditions can be discovered by  
careful observation.  
Wheel Unbalance  
Refer to the  
Troubleshooting  
Drive Pulley Misalignment  
Incorrect Belt Tension  
Bearing Misalignment  
Mechanical Looseness  
Faulty Belts  
Drive Component Unbalance  
Poor Inlet/Outlet Conditions  
Foundation Stiffness  
section of this manual  
for corrective actions.  
If observation cannot  
locate the source of  
vibration, a qualified  
technician using  
vibration analysis  
Replace cassette into unit, plug in wheel drive,  
replace access door and apply power. Observe by  
opening door slightly (remove filters if necessary to  
view wheel) the wheel should rotate freely at about  
20-40 RPM.  
equipment should be consulted. If the problem is  
wheel unbalance, in-place balancing can be done.  
Generally, fan vibration and noise is transmitted  
to other parts of the building by the ductwork. To  
eliminate this undesirable effect, the use of heavy  
canvas connectors is recommended.  
Energy Recovery Wheel  
The ERVe models contain a total energy recovery  
wheel. The wheels are inspected for proper  
mechanical operation at the factory. However, during  
shipping and handling, shifting can occur that may  
affect wheel operation. The wheel is accessible  
through the access  
door marked  
“Energy Wheel  
Cassette Access”.  
Turn the energy  
recovery wheels  
by hand to verify  
free operation.  
The wheel should  
rotate smoothly  
and should not  
Inside layout of ERVe  
wobble.  
Bearing  
Support  
Adjustable  
Air Seals  
Label  
Drive Belt  
showing  
cassette  
serial #  
and date  
code  
Drive Pulley  
Model ERVe Energy Recovery Unit  
22  
Dampers  
Routine Maintenance  
Check all dampers to ensure they open and close  
properly and without binding. Backdraft dampers can  
be checked by hand to determine if blades open and  
close freely. Apply power to motorized dampers to  
ensure the actuator opens and closes the damper as  
designed.  
DANGER  
Electric shock hazard. Can cause injury or death.  
Before attempting to perform any service or  
maintenance, turn the electrical power to unit  
to OFF at disconnect switch(es). Unit may have  
multiple power supplies.  
Fan Belts  
CAUTION  
Belts must be checked on a regular basis for  
wear, tension, alignment, and dirt accumulation.  
Premature or frequent belt failures can be caused by  
improper belt tension (either too loose or too tight)  
or misaligned sheaves. Abnormally high belt tension  
or drive misalignment will cause excessive bearing  
loads and may result in failure of the fan and/or motor  
bearings. Conversely, loose belts will cause squealing  
on start-up, excessive belt flutter, slippage, and  
overheated sheaves. Both loose and tight belts can  
cause fan vibration.  
Use caution when removing access panels or other  
unit components, especially while standing on a  
ladder or other potentially unsteady base. Access  
panels and unit components can be heavy and  
serious injury may occur.  
Once the unit has been put into operation, a routine  
maintenance program should be set up to preserve  
reliability and performance. Items to be included in  
this program are:  
When replacing belts on multiple groove drives, all  
belts should be changed to provide uniform drive  
loading. Do not pry belts on or off the sheave. Loosen  
belt tension until belts can be removed by simply  
lifting the belts off the sheaves. After replacing belts,  
ensure that slack in each belt is on the same side of  
the drive. Belt dressing should never be used.  
Lubrication  
Apply lubrication where required  
Dampers  
Check for unobstructed operation  
Fan Belts  
Check for wear, tension, alignment  
Motors  
Do not install new belts on worn sheaves. If the  
sheaves have grooves worn in them, they must be  
replaced before new belts are installed.  
Check for cleanliness  
Blower Wheel & Fasteners  
Check for cleanliness  
The proper belt setting is the lowest tension at which  
the belts will not slip under peak load operation.  
For initial tensioning, set the belt deflection at  
1/64-inch for each inch of belt span (measured half-  
way between sheave centers). For example, if the  
belt span is 64 inches, the belt deflection should  
Check all fasteners for tightness  
Check for fatigue, corrosion, wear  
Bearings  
Check for cleanliness  
Check set screws for tightness  
Lubricate as required  
be one inch (using  
moderate thumb  
Belt Span  
Deflection =  
64  
External Filter  
pressure at mid-point  
of the drive). Check  
belt tension two times  
during the first 24 hours  
of operation and  
Check for cleanliness - clean if required  
Internal Filter  
Check for cleanliness - replace if required  
Door Seal  
Belt Span  
periodically thereafter.  
Check if intact and pliable  
Fan Motors  
Energy Recovery Wheel  
Check for cleanliness - clean if required  
Check belt for wear  
Check pulley, bearings, and motor  
Motor maintenance is generally limited to cleaning  
and lubrication. Cleaning should be limited to exterior  
surfaces only. Removing dust and grease buildup  
on the motor housing assists proper motor cooling.  
Never wash-down motor  
Maintenance Procedures:  
Lubrication  
with high pressure spray.  
Greasing of motors is  
Check all moving components for proper lubrication.  
Apply lubrication where required. Any components  
showing excessive wear should be replaced to  
maintain the integrity of the unit and ensure proper  
operation.  
only intended when  
fittings are provided.  
Many fractional motors  
are permanently  
lubricated for life and  
require no further  
lubrication.  
Model ERVe Energy Recovery Unit  
23  
Fan Wheel & Fasteners  
Filter Size and Quantities  
Pleated Filter Size  
Wheels require very little attention when moving clean  
air. Occasionally oil and dust may accumulate on the  
wheel causing imbalance. When this occurs the wheel  
and housing should be cleaned to assure smooth and  
safe operation. Inspect fan impeller and housing for  
fatigue, corrosion or wear.  
Quantity  
Unit Size  
Supply  
20 x 20  
16 x 20  
20 x 25  
16 x 20  
Exhaust  
20 x 20  
16 x 25  
20 x 25  
16 x 20  
Supply  
Exhaust  
ERVe-20  
ERVe-35  
ERVe-45  
ERVe-55  
2
3
3
6
2
3
3
6
Routinely check all fasteners, set screws and locking  
collars on the fan, bearings, drive, motor base and  
accessories for tightness. A proper maintenance  
program will help preserve the performance and  
reliability designed into the fan.  
All dimensions in inches.  
Outdoor Air Filters: Access to the outdoor air filters  
is through the door labeled as “Filter Access” on the  
outdoor air side of the unit.  
Bearings  
Exhaust Air Filters: Access to the exhaust air filters  
is through the door labeled as “Filter Access” on the  
exhaust air side of the unit.  
Most bearings are permanently lubricated and require  
no further lubrication under normal use. Normal use  
being considered -20ºF to 120ºF and in a relatively  
clean environment. Some bearings are re-lubricatable  
and will need to be regreased depending on fan use.  
Check your bearings for grease zerk fittings to find  
out what type of bearing you have. If your fan is not  
being operated under normal use, bearings should be  
checked monthly for lubrication.  
Refer to Access Door Descriptions section for  
additional information on filter locations.  
Door Seal Maintenance  
Slip-on type seal is installed on the door. Inspect at  
least annually to ensure that seal is still pliable and  
intact.  
External Filter Maintenance  
Aluminum mesh, 2-inch deep filters are located in the  
supply weatherhood (if the weatherhood option was  
purchased). Filters should be checked and cleaned  
on a regular basis for best efficiency. The frequency  
of cleaning depends upon the cleanliness of the  
incoming air. These filters should be cleaned prior to  
start-up.  
Clean filters by rinsing with a mild detergent in warm  
water.  
Internal Filter Maintenance  
The ERVe units are always provided with 2-inch,  
pleated filters in the outdoor air and exhaust  
airstreams. These filters should be checked per  
a routine maintenance schedule and replaced as  
necessary to ensure proper airflow through the  
unit. See table for pleated filter size and quantity  
for each unit. Replacement filters shall be of same  
performance and quality as factory installed filters.  
Filter type must be pleated design with integral metal  
grid. Two acceptable filter replacements are Aerostar  
®
Series 400 or Farr 30/30 .  
Model ERVe Energy Recovery Unit  
24  
Cleaning the Energy Recovery Wheel  
Energy Recovery Wheel Maintenance  
Annual inspection of the energy recovery wheel is  
recommended. Units ventilating smoking lounges  
and other non-clean air spaces should have energy  
recovery wheel inspections more often based upon  
need. Inspections for smoke ventilation applications  
are recommended bimonthly to quarterly until a  
regular schedule can be established.  
If the wheel appears excessively dirty, it should be  
cleaned to ensure maximum operating efficiency.  
Only excessive buildup of foreign material needs to  
be removed. Discoloration and staining of energy  
recovery wheel does not affect its performance.  
Thoroughly spray wheel matrix with household  
®
cleaner such as Fantastik or equivalent. Gently rinse  
with warm water and using a soft brush remove any  
heavier accumulation. A detergent/water solution can  
also be used. Avoid aggressive organic solvents, such  
as acetone. The energy recovery wheel segments  
can be soaked in the above solution overnight for  
stubborn dirt or accumulation.  
Accessing the Energy Recovery Wheel  
Disconnect power to the ERVe. Open door labeled  
“Energy Wheel Cassette Access”.  
Unplug the wheel drive motor.  
Pull the wheel cassette halfway out.  
After cleaning is complete, shake the excess water  
from the wheel or segments. Dry wheel or segments  
before placing them back into the cassette. Place  
wheel or segments back into cassette by reversing  
removal procedures.  
Removing the Energy Recovery Wheel Segments  
(stainless steel rim)  
Steel retainers are located on the inside of the wheel  
rim. Push the retainer towards the center of the  
wheel, then lift up and away to release segments.  
CAUTION  
Do not clean energy recovery wheel segments with  
water in excess of 140ºF (60ºC).  
Bracket Segment  
Retainer  
Do not dry energy recovery wheel segments in air in  
excess of 140ºF (60ºC).  
Lift away from  
segment  
Catch Segment  
Retainer  
Inside of wheel rim  
Spoke  
The use of a pressure washer to clean segments is  
not recommended. Damage could result.  
Push toward center  
Energy Recovery Wheel Belt  
Inspect belts each time  
filters are replaced. Belts  
that look chewed up  
or are leaving belt dust  
near the motor pulley  
may indicate a problem  
with the wheel. Be sure  
to inspect wheel for  
Important! Place retainers back in the original  
position before rotating the energy recovery wheel,  
otherwise damage to retainer will occur.  
smooth and unrestricted  
rotation. If a belt requires  
replacement, contact  
Wheel Belt & Pulley  
the local Greenheck  
representative. Instructions  
for replacement will ship with the new belt.  
Energy Recovery Wheel Bearing  
In the unlikely event that  
a wheel bearing fails,  
the bearing is behind  
a removable plate on  
the wheel support  
beam. Contact the local  
Greenheck representative  
for detailed instructions  
on how to replace the  
bearing.  
Wheel segment removed  
Wheel Bearing  
Model ERVe Energy Recovery Unit  
25  
Parts List  
Sequence of Operation  
Basic Unit  
The ERVe units are prewired such that when a call  
for outside air is made (via field supplied 24 VAC  
control signal wired to unit control center), the supply  
fan, exhaust fan and energy wheel are energized  
and optional motorized dampers open. The ERVe is  
normally slaved (24 volt) to the roof top air handler.  
When the roof top air handler starts, the auxiliary  
contactor in the air handler closes to start the ERVe.  
7
8
7
5
4
Summer Operation  
Outdoor air is preconditioned (temperature and  
moisture levels are decreased) by the transfer of  
energy from the cooler, drier, exhaust air via the  
energy recovery wheel. The preconditioned air is  
typically mixed with return air going back to the air  
handler for final conditioning.  
2
3
Economizer Operation: Refer to Economizer  
Application/Operation section.  
1. Supply blower  
• Forward curved fan  
Winter Operation  
• Adjustable motor mount for belt tensioning  
• Adjustable sheaves for speed control  
Not depicted on this image  
Outdoor air is preconditioned (temperature and  
moisture levels are increased) by the transfer of  
energy from the warmer, more humid exhaust air via  
the energy recovery wheel. The preconditioned air is  
typically mixed with return air going back to the air  
handler for final conditioning.  
2. Vibrations isolators (quantity 4 per blower)  
• Neoprene  
3. Energy recovery wheel cassette  
Frost Control Operation: Refer to Frost Control  
Application/Operation section.  
4. Removable energy recovery wheel segments  
5. Standard supply weatherhood with 2-inch  
aluminum mesh filter  
Other Accessories:  
Rotation Sensor: Refer to Optional Accessories  
section  
6. Standard exhaust weatherhood with birdscreen  
Not depicted on this image  
Dirty Filter Sensor: Refer to Optional Accessories  
section  
7. Standard supply and exhaust air filter racks for  
2-inch pleated, 30% efficient filters  
CO Sensor: Refer to Optional Accessories section  
2
VFD on Blowers: VFDs on blowers are often used  
as part of a demand control ventilation system. This  
type of system takes advantage of varying occupancy  
through the use of CO sensors to monitor space CO  
8. Electrical control box (standard features)  
• Single point power  
• Disconnect interlocked with access door  
• Motor starters for the supply blower, exhaust  
blower and energy wheel motors  
2
2
levels. If CO levels are low in the space, the VFD will  
2
operate the blowers at minimum airflow required by  
• 24 VAC, control circuit with terminal strip  
code. As the space occupancy increases and CO  
levels increase, the VFD will increase the amount  
of fresh outdoor air being brought in to offset the  
2
9. Exhaust blower  
• Forward curved fan  
• Adjustable motor mount for belt tensioning  
• Adjustable sheaves for speed control  
Not depicted on this image  
CO levels in the space (exhaust airflow is increased  
2
proportionally as outdoor airflow increases). As CO  
levels come back down, the airflow will decrease  
back to minimum requirements.  
2
Model ERVe Energy Recovery Unit  
26  
Troubleshooting – Airflow  
Test and Balance Report  
The Test and Balance Report (TAB) is utilized to determine whether the appropriate amount of outdoor air  
and exhaust air is being supplied and removed from a building, respectively. There are no set rules on what  
information must be included in a TAB report. As such, if a TAB report indicates that the airflow on a unit is low,  
prior to contacting the factory, please determine the following information:  
Unit #1  
Unit #2  
Unit #3  
Unit #4  
Model Number  
Serial Number  
Nameplate Information  
Voltage  
Hertz  
Phase  
Outdoor Air Fan Amps  
Exhaust Fan Amps  
Outdoor Air Fan Horsepower  
Exhaust Fan Horsepower  
Design Airflow  
Outdoor Air  
Exhaust  
Measured Airflow  
Outdoor Air  
Exhaust  
Measured Data  
Blower Rotation  
Outdoor Air Fan RPM  
Exhaust Fan RPM  
Outdoor Air Fan Amp Draw  
Exhaust Fan Amp Draw  
Pressure Drop Across Energy Recovery Wheel  
Outdoor Air Side  
Exhaust Side  
Airflow problems can often be tied back to improper ductwork installation. Be sure to install ductwork in  
accordance with SMACNA and AMCA guidelines.  
Model ERVe Energy Recovery Unit  
27  
Troubleshooting – Unit  
Symptom  
Possible Cause  
Corrective Action  
Replace fuse or reset circuit breaker and check  
amps.  
Blown fuse or open circuit breaker.  
Defective motor or capacitor.  
Motor starter overloaded.  
Replace.  
Blower fails to  
Reset starter and check amps.  
operate  
Check for On/Off switches. Check for correct  
supply voltage.  
Electrical.  
Drive.  
Check for broken or loose belts. Tighten loose  
pulleys.  
Shorten wiring run to mechanical room or  
install a relay which will turn unit on/off. Consult  
Factory for relay information.  
Control power (24 VAC) wiring run is too long  
(resistance should not exceed 0.75 ohms).  
Motor starters  
“chatter” or  
do not pull in  
Incoming supply power is less than anticipated.  
Voltage supplied to starter coil must be within  
Need to increase supply power or use a special  
control transformer which is sized for the actual  
+10% / -15% of nominal voltage stated on the coil. supply power.  
CFM too high.  
Check cfm and adjust drives if needed.  
Static pressures are higher or lower than  
design.  
If higher, ductwork should be improved.  
If lower, fan rpm should be lower.  
Blower rotation is incorrect.  
Motor voltage incorrect.  
Check rotation and reverse if necessary.  
Motor over amps  
Check motor nameplate versus supplied  
voltage.  
See specifications and catalog for fan curves to  
determine if horsepower is sufficient.  
Motor horsepower too low.  
Shorted windings in motor.  
Unit damper not fully open.  
Replace motor.  
Adjust damper linkage or replace damper motor.  
Improve ductwork to eliminate losses using  
good duct practices.  
System static pressure too high.  
Blower speed too low.  
Check for correct drives and rpm with catalog  
data.  
For 3-phase, see Direction of Fan Wheel  
Rotation under Unit Start-Up section.  
Fan wheels are operating backwards.  
Low airflow (cfm)  
Follow cleaning procedures in Routine  
Maintenance section.  
Dirty filter or energy wheel.  
Leaks in ductwork.  
Repair.  
Elbows or other obstructions may be  
obstructing fan outlet.  
Correct or improve ductwork.  
Adjust belt tension.  
Belt slippage.  
Check for correct fan rpm. Decrease fan speed  
if necessary.  
Blower fan speed too high.  
Filter(s) not in place.  
Install filters.  
High airflow (cfm)  
Induce Ps into system ductwork. Make sure  
grilles and access doors are installed. Decrease  
fan speed if necessary.  
Insufficient static pressure (Ps) (airflow  
resistance).  
Always have a completed Pre Start-Up Checklist, unit Start-Up Checklist, and Optional Accessories Checklist prior to requesting parts or  
service information.  
Model ERVe Energy Recovery Unit  
28  
Troubleshooting – Unit  
Symptom  
Possible Cause  
Corrective Action  
One or both  
blowers turn off  
intermittently and  
back on after  
Adjust frost temperature sensor set point as  
needed.  
Exhaust Only frost control sensors are tripping.  
about 2 minutes  
See Energy Recovery Wheel under Unit Start-Up  
section.  
Air seals are too tight.  
Adjust temperature or enthalpy set points as  
needed.  
“Economizer” sensors are operating.  
No power to wheel motor.  
Wheel drive belt.  
Energy wheel does  
NOT turn  
Make sure wheel drive is plugged in. Verify  
power is available.  
Check for loose or broken belts. Replace belts  
(consult factory).  
Refer to VFD section. Compare motor amp  
rating to setting in VFD. Adjust accordingly.  
VFD overload. (OL1 on readout)  
Recheck air seals, make sure they are not too  
tight. See Energy Recovery Wheel under Unit  
Start-Up Section.  
Energy wheel runs  
intermittently  
Wheel motor overloads are tripping, due to  
rubbing between wheel and air seals.  
Adjust wheel and/or inlet cone. Tighten wheel  
hub or bearing collars on shaft.  
Fan wheel rubbing on inlet.  
Bearings.  
Replace defective bearing(s). Lubricate  
bearings. Tighten collars and fasteners.  
Wheel out of balance.  
Loose wheel on shaft.  
Loose motor or blower sheave.  
Belts too loose.  
Replace or rebalance.  
Tighten wheel setscrew.  
Tighten sheave setscrew.  
Adjust belt tension after 24 hours of operation.  
Excessive noise  
or vibration  
Loosen to maintain a 3/8 inch deflection per  
foot of span between sheaves.  
Belts too tight.  
Worn belt.  
Replace.  
Motor base or blower loose.  
Buildup of material on wheel.  
Bearing and drive misaligned.  
Tighten mounting bolts.  
Clean wheel and housing.  
Realign.  
Make sure ductwork is supported properly.  
Make sure ductwork metal thickness is sized for  
proper stiffness. Check duct size at discharge to  
ensure that air velocities are not too high.  
Noise being transmitted by duct.  
Always have a completed Pre Start-Up Checklist, unit Start-Up Checklist, and Optional Accessories Checklist prior to requesting parts or  
service information.  
Model ERVe Energy Recovery Unit  
29  
Maintenance Log  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
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Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
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_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Model ERVe Energy Recovery Unit  
30  
Maintenance Log  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Date __________________ Time _____________ AM/PM  
Notes:___________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Model ERVe Energy Recovery Unit  
31  
Warranty  
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from  
the shipment date. The energy recovery wheel is warranted to be free from defects in material and workmanship for a  
period of five years from the shipment date. Any units or parts which prove defective during the warranty period will  
be replaced at our option when returned to our factory, transportation prepaid. Motors are warranted by the motor  
manufacturer for a period of one year. Should motors furnished by Greenheck prove defective during this period, they  
should be returned to the nearest authorized motor service station. Greenheck will not be responsible for any removal  
or installation costs.  
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications  
without notice.  
Greenheck Catalog Energy Recovery Ventilator, Model ERVe,  
provides additional information describing the equipment,  
fan performance, available accessories, and specification  
data.  
AMCA Publication 410-96, Safety Practices for Users and  
Installers of Industrial and Commercial Fans, provides  
additional safety information. This publication can be  
®
Phone: (715) 359-6171 • Fax: (715) 355-2399 • E-mail: [email protected]Web site: www.greenheck.com  
473007 • Model ERVe IOM, Rev. 2, April 2012 Copyright 2012 © Greenheck Fan Corp.  
32  

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