Field Controls Ventilation Hood PVU 300 User Manual

POWER VENTER SYSTEM  
Model: PVU-300  
Included is one ETL LISTED power venter to be used for side wall venting of a single 120/24 VAC controlled  
furnace, boiler, or water heater which burns natural or LP gas, or oil. The PVU may also be used to vent a  
single 24 VAC controlled gas fired furnace or boiler and a 30 millivolt residential gas fired water heater.  
TYPICAL VENTING SYSTEM COMPONENTS  
ETL LISTED PVU-300 POWER VENTER with pre-wired integral Universal  
Control (24VAC and 120 VAC), factory set Draft Proving Switch, and direct  
access Terminal Blocks.  
• Side Wall Vent Hood (Not included)  
• Barometric Draft Control (Not Included)  
• Spill Switches (Not included)  
CONTENTS  
PAGE  
System Operation  
Power Venter Sizing  
2
2-3  
3-4  
4-6  
6
6-8  
8
9
Installation Safety Instructions  
Installation of Power Venter  
General Wiring Instructions  
PVU Internal Wiring Schematic  
Adjusting Thermostat Anticipator  
Airflow Adjustments  
General Installation Inspection  
System Control Check Procedures  
Troubleshooting Tips  
Maintenance  
Replacement Parts List  
Multiple Venting Systems  
9
10  
10  
10  
10  
11-13  
Venting System Operational Information  
Installation Information  
15  
15  
This device MUST be installed by a qualified agency in accordance with the manufacturers installation  
instructions.  
The definition of a qualified agency is: any individual, firm, corporation or company which either in person or through a representative is  
engaged in, and is responsible for, the installation and operation of gas appliances, who is experienced in such work, familiar with all  
the precautions required, and has complied with the requirements of the authority having jurisdiction.  
DO NOT DESTROY  
THESE INSTRUCTIONS MUST REMAIN WITH EQUIPMENT  
2630 Airport Road · Kinston, NC 28504  
Phone: 252-522-3031· Fax: 252-522-0214  
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PROCEDURE FOR CALCULATING TOTAL EQUIVALENT PIPE LENGTH IN FEET  
1. Calculate the total equivalent feet for each type of fitting used in the venting system from the following chart.  
2. Calculate the total amount of feet for the straight lengths of vent pipe.  
3. Add the equivalent feet for the fittings with the total amount of feet of straight lengths.  
Table 3  
EQUIVALENT LENGTH (FEET) OF VENT PIPE FOR VENT PIPE FITTINGS  
VENT PIPE DIAMETER  
VENT PIPE FITTINGS  
3”  
19  
5
4”  
25  
7
5”  
31  
9
6”  
38  
11  
5
7”  
44  
12  
6
8”  
50  
14  
7
9”  
56  
16  
8
10”  
63  
18  
9
TEE  
90° ELBOW  
45° ELBOW  
3
4
4
1/4  
1/2  
3/4  
8
11  
7
14  
8
17  
10  
4
19  
12  
4
22  
13  
5
25  
15  
6
28  
17  
6
REDUCER  
(d/D)*  
5
2
3
3
*Reducer or increaser ratio (d/D) small diameter divided by the larger diameter. (See Figure 3)  
Example: 4" to 8" reducer, the reducer ratio is d/D = 4/8 = 1/2. To estimate the equivalent foot  
length for the fitting, use the smaller pipe diameter for the equivalent length figure. Example:  
4" to 8" reducer; the reducer ratio is 1/2 and the smaller pipe  
diameter is 4". So, from the chart, the equivalent feet would be 7  
feet.  
Example: System Pipe Size = 4"  
Step 1  
Step 2  
Step 3  
2 – 90° Elbows (4") = 14 Ft.  
10 - 2 Ft. Lengths of 4" Pipe = 20 Ft.  
Total Equivalent Feet = 14 Ft. + 20 Ft. = 34 Ft.  
Figure 3  
INSTALLATION SAFETY INSTRUCTIONS  
CAUTION: This device must be installed by a qualified installer in accordance with the manufacturer's installation  
instructions. Appliances should have a minimum of 75% combustion efficiency or have a maximum measured flue gas  
temperature of 550°F at the inlet of the venter.  
1. The power venting system must be installed by a qualified installer. "Qualified Installer" shall mean an individual who  
has been properly trained or a licensed installer. The installer must write or imprint his name, phone number and date  
of installation on the installation tag. The tag should be attached to the power venter unit. Recording burner and  
venting system initial operational information is recommended as a guide for service or burner tune-up. Enter this on  
the back page of this manual.  
2. Safety inspection of a venting system should be performed before and after installing a power venting system on an  
existing or new appliance. Procedures to follow are those recommended by the National Fuel Gas Code,  
A.N.S.I.Z223.1 or refer to the "General Installation Inspection" section of this manual.  
3. Plan the vent system layout before installation to avoid the possibility of accidental contact with concealed wiring or  
plumbing inside walls.  
4. Single wall vent pipe may be used to join an appliance to the venting system, but if proper clearances cannot be  
maintained from combustible materials, Class B Vent Pipe should be used for gas appliances. Refer to national or  
local codes for guidelines. Also, a minimum of 6 inches clearance between the venter housing and combustible  
materials must be maintained.  
5. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.  
6. This equipment is designed to overcome minor negative pressure conditions. To ensure extreme negative pressure  
does not exist, follow the "General Installation Inspection" section of this manual.  
7. Heating appliances equipped with draft hoods, such as boilers or furnaces, LP and natural gas appliances SHOULD  
have a secondary spillage switch installed. On appliances without draft hoods, it is recommended that the secondary  
safety switch GSK-3 be installed into the system. Gas-fired 30 millivolt power systems MUST be equipped with a  
spillage switch.  
Page 3  
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8. Air flow adjustment MUST be made to ensure appliance efficiency. This should be done at the appliance exhaust  
outlet with a velocity meter, draft gauge or by the "match test procedure". The match test is in accordance with  
National Fuel Gas Code A.N.S.I.Z223.1, Section 8.6.  
9. On heating appliances not equipped with a draft hood, a barometric draft control MUST be installed to regulate proper  
air flow and fluctuations in the system's air flow during operation. Fluctuations can come from wind loads on the outlet  
of the venter, house depressurization during windy days and the different house ventilation requirements between  
summer and winter operation. Use a Field Controls Type MG-1 Barometric Draft Control. Gas-fired draft induced  
systems should have a single-acting or double-acting barometric draft control installed.  
Diagram A  
INSTALLATION OF POWER VENTER  
CAUTION: Failure to install, maintain and/or operate the power venting system in accordance with manufacturer's  
instructions will result in conditions which may produce bodily injury and/or property damage.  
1. Remove power venter from box and inspect unit for damage. If the carton has been crushed or mutilated, check unit  
very carefully for damage. Rotate venter wheel to insure that the motor and venter wheel rotate freely. DO NOT install  
if any damage is apparent. Refer to unit sizing chart to check proper venting sizing.  
2. Location of the termination of the venting system should be installed in accordance with the National Fuel Gas Code,  
A.N.S.I.Z233.1, manufacturer's recommendations, and/or local codes which are applicable. See the following  
requirements or refer to Diagram A for typical locations.  
a. The exit termination of mechanical draft systems shall  
not be less than 7' above grade when located  
adjacent to public walkways.  
b. A venting system shall terminate at least 3' above any  
forced air inlet located within 10'.  
c. The venting system of other than a direct vent  
appliance shall terminate at least 4' below, 4'  
horizontally from, or 1' above any door, window, or  
gravity air inlet into the building.  
d. The vent termination of a direct vent appliance with an  
input of 50,000 BTU/Hr or less, shall be located at  
Figure 4  
least 9" from any opening through which vented gases  
could enter the building. With an input over 50,000  
BTU/Hr, a 12" termination clearance shall be required.  
e. The vent termination point shall not be installed closer than 3' from an inside corner of an L-shaped structure.  
f. The vent termination should not be mounted directly above or within 3' horizontally from an oil tank vent or gas  
meter.  
g. The bottom of the vent terminal shall be located at least 12" above finished grade.  
Page 4  
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SIDE WALL VENT HOOD INSTALLATION  
1. Use the inside wall plate as a template to mark the hole location. Cut a hole 1 inch larger than the marked hole to  
facilitate easy installation (See Figure 4)  
2. Center vent hood through the hole from outside. Fasten the vent hood to the outside wall with the appropriate type of  
mounting screws.  
3. Fasten the wall end plate to the inside wall with the appropriate type of  
mounting screws. NOTE: Apply sealant to the outside mounting plate of  
the vent hood to prevent leakage.  
4. Connect the venter outlet or a properly sized section of vent pipe onto  
the inner pipe of the vent hood. Fasten the connection with three sheet  
metal screws or equivalent fastening method.  
5. Seal the vent hood inlet connection and any other vent pipe joints on the  
outlet side of the venter with an approved high temperature silicone  
adhesive sealant or equivalent material.  
NOTE: Do not enclose the space between the plates on the outside of the  
vent hood or between the inner and outer pipe of the vent hood. This might  
Figure 5  
cause overheating of the wall structure. Local codes might require  
fencing around the vent hood outlet.  
VENTER LOCATION  
Install the power venter onto the vent hood inlet or as close to the vent  
hood inlet as possible. Always install the venter such that the motor  
shaft is horizontal and the pressure switch diaphragm is vertical (See  
Figure 5) When venting a draft induced gas fired heating appliance a  
barometric draft control must be installed on the vent system between  
the appliance outlet and the venter inlet. (See Figure 6)  
Figure 6  
CAUTION: The power venter should never be installed with the motor shaft in the vertical position. This could allow heat  
to be trapped in the venter housing and radiate through the motor possibly causing motor deterioration and premature  
failure. Never attach the venter inlet directly to the outlet of the heating appliance. Also, a minimum of 6 inches clearance  
between the venter housing and combustible materials must be maintained.  
CONNECTING VENTER TO THE FLUE PIPE  
NOTE: The power venter should be supported in accordance with National Fuel Gas Code Z223.1, Section 7.910 as  
follows; A vent connector shall be supported for the design and weight of the material employed to maintain clearances  
and to prevent physical damage and separation of joints.  
NOTE: For gas fired heating appliances not equipped with a draft hood, a barometric draft control must be installed  
between the heating appliance exhaust outlet and the power venter inlet to regulate any draft fluctuations during  
operation.  
1. Use approved vent connectors to join the heating appliance outlet to the venter inlet securing each joint with sheet  
metal screws or equivalent means of fastening when required.  
2. Seal all pipe joints on the outlet side of the venter with a high temperature silicone adhesive or equivalent. Test the  
vent connections for leaks by using a soap solution as recommended by the National Fuel Gas Code, A.N.S.I. Z223.1,  
Section 4.1.1.  
Page 5  
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OPTIONAL GSK-3 EXHAUST GAS SPILLAGE DETECTOR SWITCH INSTALLATION  
NOTE: Installation of the GSK-3 secondary safety switch is recommended  
for LP and Natural gas fired appliances with a draft hood. This switch will  
detect exhaust gas spillage out of the draft hood due to a blocked vent  
system and/or inadequate draft during operation. When this switch senses  
spillage it interrupts the power supply to the gas valve which terminates the  
burner operation.  
1. Mount the GSK-3 on the lower edge of the draft hood with the exposed  
thermal disk directed into the draft hood (See Figure 7)  
2. Route the electrical wires along the heating appliance cabinet within an  
accepted wiring enclosure in accordance with the National Electrical  
Code and any applicable local codes. Keep the wires away from any  
HOT surfaces.  
3. Wire the switch into the low voltage thermostat circuit. Refer to the  
appropriate wiring diagram in this manual.  
Figure 7  
4. After installation, check the amperage through the thermostat circuit and adjust the anticipator if necessary.  
CAUTION: The GSK-3 is a manual reset switch. Investigate the system thoroughly for the cause of any shut down and  
correct the problem before resetting the GSK-3 and restarting the system.  
Diagram B – Internal Wiring Schematic for PVU-300  
Page 6  
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GENERAL WIRING INSTRUCTIONS  
CAUTION: Disconnect electrical power before wiring power venter!  
Connect line voltage (110/120 VAC) through junction box access hole labeled "120 VAC Only". Connect low voltage  
control wiring through junction box access hole labeled "24 VAC Control Wiring Only". VENTER MUST BE  
GROUNDED! Check ground circuit to make certain that venter has been properly grounded. The wiring must be  
protected by an over current protection circuit such as a fuse or circuit breaker rated at 15 amperes. Prevent wiring  
contact with any heat source.  
IMPORTANT: The PVU-300 is shipped with the yellow mode wire connected to the 120VAC terminal. This is correct for  
120VAC control (typical oil-fired). For 24VAC control (typical gas fired) the yellow mode wire must be disconnected from  
the 120VAC terminal and reconnected to the 24VAC terminal (see wiring diagrams).  
NOTE: Wire the venter in accordance with the National Electrical Code and applicable local codes. Refer to Diagrams C  
and D for proper wiring specifications for a 24VAC Gas or 120VAC Oil fired appliance.  
Diagram C – Wiring with 24 VAC Gas Valve  
Diagram D – Wiring with a 120 VAC Oil Fired Primary Control  
Page 7  
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NOTE: A CK-20FV or CK-20FG control kit MUST be added to the system to properly control the venter with the operation  
of a 30mV water heater. Refer to Diagram E for proper wiring specifications.  
Diagram E – Wiring with a 30mV Water Heater  
ADJUSTING THERMOSTAT ANTICIPATOR  
If connecting the Power Venter system to a gas appliance with a  
thermostat anticipator, refer to the following to make adjustments.  
Disconnect one side of the thermostat circuit at the gas valve or burner  
control, and connect an ampere meter into the circuit. With the system  
running, take an amperage reading on the circuit. Check the nameplate or  
instructions for the thermostat to obtain the proper amperage level. Adjust  
amperage level by moving the anticipator lever. Reconnect the thermostat  
to the gas valve and start the system operating. Time the burn cycles and  
adjust as follows; To make the cycle time longer, increase the amount on  
the anticipator (Example: .45 to .5 Amps); to decrease cycle time, reduce  
the amount on the anticipator. (Example: .45 to .3 Amps) (See Figure 8)  
Figure 8  
Page 8  
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AIR FLOW ADJUSTMENTS  
1. To properly adjust the venter air flow, loosen the inlet ring screws and open the  
choke plate approximately 1/2 to 3/4 open. (See Figure 9) Start the heating  
appliance following the manufacturer specified procedure, and set the  
thermostat to call for heat.  
2. After the system has operated for several minutes to stabilize the exhaust gas  
temperature, check for air flow at the draft hood or the heating appliance outlet  
using a velocity meter, draft meter, or match test procedure.  
3. Adjust the venter choke plate inward or outward to obtain the minimum draft  
necessary to maintain venting. Then increase the draft slightly (Approximately  
10% over minimum flow rate) to ensure proper venting during any variations in  
venter performance, such as wind load or house depressurization.  
Figure 9  
4. Secure the choke plate into position by tightening the screws on the inlet collar  
(See Figure 9)  
GENERAL INSTALLATION INSPECTION  
Follow recommended procedures for safety inspection of a heating appliance in accordance with the National Fuel Gas  
Code A.N.S.I. Z223.1. The following procedure will help in evaluation of the venting system. It is intended as a guide to  
aid in determining that the appliance is properly installed and is in a safe condition for continuous use. This is a  
generalized procedure, which cannot anticipate all situations. Accordingly, in some cases deviation from this procedure  
may be necessary to determine safe operation of the equipment. If it is determined that a condition which could result in  
unsafe operation exists, the appliance should be shut off and the owner advised of the unsafe conditions. Corrections  
must be made prior to allowing continuous operation. The following steps should be taken in making a safety inspection.  
1. Visually inspect the venting system for proper size and determine that there is no blockage, restriction, leakage,  
corrosion, or other deficiencies, which could cause unsafe operation.  
2. To the extent possible, close all building doors, windows, and all doors to the room in which the heating appliance is  
located. Turn on clothes dryers and any exhaust fans so that they operate at maximum speed. Do not operate a  
summer exhaust fan. Also close all fireplace dampers. If after completing steps 3 through 7 it is believed that sufficient  
combustion air is not available, refer to the National Fuel Gas Code A.N.S.I. Z223.1 or any local codes for proper  
guidelines.  
3. Place the appliance being inspected into operation. Follow the lighting instructions and adjust the thermostat so that  
the heating appliance will operate continuously.  
4. Determine that the burner is operating properly and that the main burner ignition functions satisfactorily, by  
interrupting the electrical power of the appliance in any safely convenient manner. Test the burner safety device to  
determine if it is operating properly by extinguishing the pilot or disconnecting the flame safety circuit.  
5. Visually determine that the main burner is burning properly, i.e. no floating, lifting, or flashbacks. Adjust the primary air  
shutter as required by the appliance manufacturer. If the appliance is equipped with high and low flame control or  
flame modulation, check for proper main burner operation at both flame levels.  
6. Test for exhaust gas spillage at the draft hood or the barometric draft control after approximately 5 minutes of main  
burner operation. Use a draft meter or flame or smoke from match, candle or cigarette.  
7. Turn on all fuel burning appliances within the same room so that they operate at their maximum capacity. Then repeat  
Steps 5 and 6.  
8. Return all doors, windows, exhaust fans, fireplace dampers, and any other fuel burning appliances to their previous  
condition.  
Page 9  
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SYSTEM CONTROL CHECK PROCEDURES  
1. Adjust the thermostat to call for heat and observe the power venting system for proper operation sequence. Repeat as  
necessary.  
a. Thermostat calls for heat.  
b. Venter relay is energized which starts venter motor.  
c. Pressure switch closes which allows burner to fire.  
d. Thermostat is satisfied, burner stops operation.  
e. Venter continues to operate for up to 2 minutes during the post purge cycle.  
2. While the system is in operation, disconnect the draft tube from the air pressure switch. The pressure switch should  
open and interrupt burner operation. Re-connect the draft tube to the air pressure switch, which should allow the  
burner re-light.  
3. If a GSK-3 secondary safety switch is installed, allow the vent pipe to cool and disconnect the vent pipe between the  
appliance outlet and venter inlet. Block the vent connected to the appliance with a non-combustible material. Activate  
the heating system main burner and verify that the GSK-3 shuts down the burner within a few minutes or less. Reset  
the GSK-3 and repeat.  
TROUBLESHOOTING TIPS  
1. Burner does not fire when thermostat calls for heat.  
a. Make sure draft tube is securely fastened to the air pressure switch, and is not blocked.  
b. Check for continuity across pressure switch terminals when venter is operating.  
c. Check wiring connections between air pressure switch, appliance, relay, yellow mode wire connection  
and PVU control board.  
d. Relay should “click” when pressure switch closes.  
2. Venter does not activate when thermostat calls for heat.  
a. Check to see if relay closes when thermostat calls for heat.  
b. Check wiring connections, including yellow mode wire connection.  
c. Check motor for unrestricted shaft rotation.  
3. Exhaust gas odor.  
a. Check system draft level during operation.  
b. Check vent system on outlet side of venter for leakage.  
c. Check for negative pressure in building.  
MAINTENANCE  
1. Motor: Inspect the motor once a year - motor should rotate freely. The PVU’s motor has sealed ball bearings,  
therefore, should not need oiling.  
2. Blower Wheel: Inspect the blower wheel annually to clear any soot, ash or coating, which inhibits either rotation or  
airflow. Remove all foreign materials before operating.  
3. Vent System: Inspect all vent connections annually for looseness, for evidence of corrosion and for flue gas leakage.  
Replace, seal, or tighten pipe connections if necessary. Check the power venter choke plate to insure it is secured in  
place. Check the barometric draft control, if installed, to insure the gate swings freely.  
4. System Safety Devices: With the heating system operating disconnect the pressure sensing tube from the pressure  
switch on the venter. This should stop the burner operation. Re-connecting the tube will relight the burner. For 30  
millivolt operating systems, disconnect one lead of the spill switch circuit from the thermocouple junction block. This  
should shut off the pilot and the burner. Re-connection will allow re-lighting of the pilot.  
REPLACEMENT PARTS LIST  
The following items are available for replacement, if necessary.  
REPLACEMENT PARTS LIST  
DESCRIPTION  
PVU-300  
Motor  
Blower Wheel  
46512900  
46513100  
46257300  
46513200  
46399200  
24 VAC Relay  
Pressure Switch  
CK-63/PVU Circuit Board  
Page 10  
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MULTIPLE VENTING SYSTEMS  
1. To vent a 24 VAC controlled boiler or furnace and a 30  
millivolt residential water heater using one PVU power  
venter refer to the following.  
a. Follow the instructions for safe and proper venting  
previously specified in this manual. Make sure that the  
combined gross BTU/Hr input and equivalent vent pipe  
length does not exceed the maximum venting capacity  
of the venter selected.  
b. A CK-20FV or CK-20FG control kit MUST be added to  
the system to properly control the venter during  
operation of the water heater. Refer to Figure 10 and  
Diagram F for vent pipe arrangement and wiring  
information.  
Figure 10  
Diagram F – Multiple Wiring with 24 VAC Furnace and 30mV Water Heater  
Page 11  
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2. To vent two 24 VAC appliances using one PVU power venter refer to the following.  
a. Follow the instructions for safe and proper venting previously specified in this manual. Make sure that the  
combined gross BTU/Hr input and equivalent vent pipe length does not exceed the maximum venting capacity of  
the venter selected.  
b. A CK-41 Control Kit must be added to the system to properly control the venter when common venting an  
additional 24 VAC furnace or boiler. Tee the draft tube on the PVU unit to connect to the air pressure switch on  
the Control Kit. Refer to Diagram G for wiring instructions.  
Diagram G – Multiple Wiring with two 24 VAC Appliances  
Page 12  
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3. To vent two 120 VAC appliances using one PVU power venter refer to the following.  
c. Follow the instructions for safe and proper venting previously specified in this manual. Make sure that the  
combined gross BTU/Hr input and equivalent vent pipe length does not exceed the maximum venting capacity of  
the venter selected.  
d. A CK-61, 62, or 63 Control Kit must be added to the system to properly control the venter when common venting  
an additional 120 VAC furnace or boiler. Tee the draft tube on the PVU unit to connect to the air pressure switch  
on the Control Kit. Refer to Diagram H for wiring instructions.  
Diagram H – Multiple Wiring with two 120 VAC Appliances  
Page 13  
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PV SERIES POWER VENTER: VERTICAL VENTING OPTION  
Natural gas, lp gas or #2 fuel oil appliance rated at 75% or greater non-condensing type of appliance.  
Maximum input temperature at power venter: 575°f  
Diagram I – Vertical Venting Option  
Page 14  
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VENTING SYSTEM OPERATIONAL INFORMATION  
Date:  
Heating appliance BTU/Hr input  
Gas valve operation pressure  
Vent system draft above draft hood or  
below barometric draft control  
CO2 measurement  
CO measurement  
Appliance outlet flue gas temperature  
INSTALLATION INFORMATION  
PVU-300  
MODEL NO.:____________________________________________________________  
INSTALLER'S NAME:_____________________________________________________  
INSTALLER'S COMPANY:_________________________________________________  
INSTALLER'S PHONE NO.:________________________________________________  
DATE OF INSTALLATION:_________________________________________________  
Page 15  
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P/N 46517200 Rev B 11/06  
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