Honeywell M8405 User Manual
Solid State Economizer System  
(CONSISTING OF: C7046C DISCHARGE AIR SENSOR OR C7150B MIXED AIR SENSOR, C7400A  
SOLID STATE ENTHALPY SENSOR OR C7650A SOLID STATE TEMPERATURE SENSOR, M7415  
OR M8405 DAMPER ACTUATORS OR MODULATING DIRECT COUPLED ACTUATORS (MS7505),  
T6031H THERMOSTAT AND W7459 OR W7212 SOLID STATE ECONOMIZER LOGIC MODULE)  
PRODUCT DATA  
FEATURES  
C7046C Discharge Air Sensors have probe lengths of 8 in.  
(203 mm) and nominal sensor resistance of 3000 ohms at  
C7046C  
77°F (25°C).  
•
•
•
•
No setting or calibration required.  
Solid state components not affected by dust or dirt.  
Fast reacting.  
M7415/M8405  
Rugged aluminum insertion probe.  
C7150B Mixed Air Sensor is used with the W7212/W7459  
Economizer Module to sense mixed or discharged air in roof-  
top packaged air conditioning equipment.  
C7150B  
W7459A,C  
•
No setting or calibration required.  
C7400A Solid State Enthalpy Sensor and C7650A Solid State  
Temperature Sensors are used with the W7212/W7459 Solid  
State Economizer Logic Module to sense outdoor and return  
air enthalpy or temperature.  
W7212  
•
C7400A senses and combines temperature and  
humidity (enthalpy) of outdoor air (heat index).  
T6031H  
C7400A/C7650A  
•
•
C7650A senses temperature only.  
When enthalpy/temperature of outdoor air increases,  
the outdoor air damper closes to a preset minimum  
position.  
APPLICATION  
•
•
When enthalpy/temperature of outdoor air is low, the  
outdoor air damper opens to reduce the building  
cooling load.  
The Solid State Economizer System provides an economical  
method of providing cooling air by incorporating outdoor air in  
the first stage of cooling in heating, ventilating and air  
conditioning (HVAC) systems. The Solid State Economizer  
System consists of the C7046C Discharge Air Sensor or  
C7150B Mixed Air Sensor, C7400A Solid State Enthalpy  
Sensor or C7650A Solid State Temperature Sensor, M7415  
or M8405 Damper Actuators or Modulating Direct Coupled  
Actuators (MS7505), T6031H Thermostat and W7212 or  
W7459A,C Solid State Economizer Logic Module.  
Additional economizer savings are achieved when two  
C7400A Solid State Enthalpy Sensors are connected to  
one Logic Module for differential enthalpy changeover  
control.  
Contents  
Sequence of Operation .................................................... 16  
Operation: W7212 ............................................................ 17  
Settings and Adjustments: W7212 ................................... 18  
Checkout and Troubleshooting ........................................ 19  
Checkout and Troubleshooting: W7212 ........................... 31  
Application ........................................................................  
Features ...........................................................................  
Ordering Information ........................................................  
Specifications ...................................................................  
Specifications: M7215 ......................................................  
Specifications: W7212A Logic Module .............................  
Installation: M7215, M7415, M8405 .................................  
Wiring: M7215, M7415, M8405 ........................................  
1
1
2
3
4
6
7
8
Operation and Checkout .................................................. 12  
Settings and Adjustments ................................................. 14  
63-2484-2  
   
SOLID STATE ECONOMIZER SYSTEM  
Mounting Arrangement:  
Integral mounting flange that requires two no. 8 screws (not  
provided).  
MS7505 Spring Return Direct Coupled Actuator  
The MS7505 Series Spring Return Direct Coupled Actuators  
(DCA) are control actuators that provide proportioning control  
for valves and dampers. They accept a voltage signal from an  
economizer to position a damper or valve at any chosen point  
between fully open and fully closed.  
Maximum Ambient Temperature:  
250°F (121°C).  
Operating Temperature Range:  
40°F to 150°F (4°C to 66°C).  
•
Control for air damper applications with up to 12.5 sq ft  
assuming 3.5 in.-lb per sq ft of damper area, velocity  
independent.  
Wiring Connections:  
•
•
•
•
•
•
•
Brushless DC submotor with electronic stall protection.  
Patented self-centering shaft adapter.  
Access cover to facilitate connectivity.  
Metal housing with mechanical end limits.  
Field-installable auxiliary switches.  
6 in. (152 mm) leadwires.  
Dimensions:  
See Fig. 1.  
C7150B Mixed Air Sensor  
Used to sense mixed air in rooftop packaged air conditioning  
equipment.  
Spring return direction field-selectable.  
Hub includes position indicator.  
Resistance/Temperature (NTC):  
Nominal Resistance: 3000 ohms at 77°F (24°C). Nominal Sen-  
sitivity: 70 ohms per degree F (124 ohms per degree C) at  
midrange.  
SPECIFICATIONS  
IMPORTANT  
Maximum Ambient Temperature:  
250°F (121°C).  
The specifications given in this publication do not  
include normal manufacturing tolerances. Therefore,  
these units may not exactly match the specifications  
listed. Also, these products are tested and calibrated  
under closely controlled conditions and some minor  
differences in performance can be expected if these  
conditions are changed.  
Operating Temperature Range:  
-40°F to +110°F (-40°C to +44°C).  
Dimensions:  
See Fig. 2.  
Models:  
C7400A Solid State Enthalpy Sensor/C7650A Solid  
State Temperature Sensor  
Senses enthalpy or temperature of outdoor and return air.  
Specifications for each model are listed separately.  
C7046 Discharge Air Sensors  
Intended for use as a discharge sensor in rooftop applications.  
Temperature Sensing Element:  
Thermistor.  
Sensing Element:  
Carbon type, thermistor-resistor element.  
Output Signal:  
4 to 20 mA current signal; increases from 4 mA to 20 mA as  
Performance Characteristics:  
Reaction Time Constant with Air Approach Velocity of 8.33 ft/  
enthalpy decreases.  
sec (2.54 m/sec): 60 seconds.  
Ambient Operating Temperature Range:  
-40°F to +125°F (-40°C to +52°C).  
Resistance/Temperature (NTC):  
Nominal Resistance: 3000 ohms at 77°F (24°C). Nominal Sen-  
sitivity: 70 ohms per degree F (124 ohms per degree C) at  
midrange.  
Approval:  
Underwriters Laboratories Inc. Flammability Rating: UL94-5V.  
Dimensions:  
See Fig. 3.  
1/2 (13)  
DIAMETER  
3/8 (10)  
DIAMETER  
7/8  
(22)  
1/4 (6)  
DIAMETER  
3/4 (19)  
9/16  
IMMERSION LENGTH: 8 (203)  
(2)  
(14)  
1-1/2 (38)  
M9087  
Fig. 1. Approximate dimensions of C7046C Air Temperature Sensor in in. (mm).  
3
63-2484—2  
 
SOLID STATE ECONOMIZER SYSTEM  
Terminal Connections:  
1/4 in. (6 mm) male quick connect terminals mounted on actua-  
tor. Terminal arrangement is dependent on actuator model.  
3/4  
(19)  
Ambient Operating Temperature Range:  
-40°F to +125°F (-40°C to +52°C).  
Voltage and Timing:  
See Table 1.  
3/16 (5) DIAMETER  
Dimensions:  
See Fig. 4.  
Shaft:  
Single-ended drive shaft with crank arm supplied.  
Flammability Rating:  
Underwriters Laboratories Inc. UL94-5V.  
2
(51)  
Approval:  
Underwriters Laboratories Inc. Component Recognized: File  
No. E4436, Guide No. XAPX2, Vol. 9, Section 1, 7-25-83.  
SPECIFICATIONS: M7215  
Models: ML7215: 25 lb-in. (2.8 Nm) torque, foot-mounted  
spring-return damper motor with 2-10 Vdc feedback signal.  
Accepts 2-10 Vdc control signal.  
2-1/2 (64)  
M9084  
Fig. 2. Approximate dimensions of C7150B Mixed/  
Discharge Air Sensor in in. (mm).  
Dimensions: See Fig. 4.  
Electrical Ratings:  
Supply Voltage: 24 ±6 Vac 50/60 Hz.  
Power Consumption: 24 Vac, 60 Hz: 8.7 VA. 24 Vac, 50 Hz: 8.4  
5/16 (8)  
VA.  
Torque:  
3-5/32  
Lift and Hold: 25 lb-in. (2.8 Nm). Spring Return: 25 lb-in. (2.8  
Nm). Breakaway: 40 lb-in. (4.5 Nm).  
+
(80)  
S
2-3/4  
IMPORTANT  
(70)  
Never use motor continuously at the breakaway  
torque rating.  
NOTE: Breakaway torque available to overcome occasional  
large loads such as a seized damper.  
9/16  
(14)  
3-7/8 (96)  
7/32  
(6)  
1 (25)  
M9096  
Stroke:  
Travel: 90°.  
Timing:  
Fig. 3. Approximate dimensions of C7400A Solid State  
Enthalpy Sensor/C7650A Solid State Temperature Sensor  
in in. (mm).  
Driving: 86 ±5 seconds.  
Spring Return: 13 ±5 seconds.  
Motor Rotation (Viewed From Shaft End):  
Closed Position: Limit of clockwise rotation.  
Open Position: Limit of counterclockwise rotation.  
Crank Arm Rotation Limits: See Fig. 8.  
M7415A, M8405A Damper Actuators  
Provides control of economizer systems on HVAC equipment.  
Actuator Rotation:  
Shipped with shaft in closed position.  
Closed position is the limit of clockwise rotation; open position  
is the limit of counterclockwise rotation as viewed from the  
shaft end of the motor.  
Ambient Ratings:  
Temperature:  
Operating: -25°F to +125°F (-32°C to +52°C).  
Storage: -30°F to +150°F (-34°C to +66°C).  
Humidity: 5 to 95 percent RH, noncondensing.  
Auxiliary Switch Rating (M8405A only):  
24 Vac, 20 VA inrush, 20 VA run.  
Terminal Connections: 1/4 in. (6 mm) quick-connect termi-  
nals mounted on motor.  
63-2484—2  
4
 
SOLID STATE ECONOMIZER SYSTEM  
Shaft: Single-ended drive shaft with crank arm supplied.  
Approvals:  
Underwriters Laboratory Inc.: Flammability Rating: UL94-5V.  
Component Recognized: File No. E4436, Guide No.  
XAPX2, Vol. 9, Section 1, 7-25-83.  
Reliability:  
Full-Stroke Cycles: 60,000. Repositions: 1,500,000.  
4-1/2 (114)  
1/4 (6)  
1-3/8 (35)  
3-1/8 (79)  
4-1/32  
(102)  
4-1/2  
(114)  
4-1/2  
(114)  
5
(127)  
2-1/4 (57)  
3-1/2 (89)  
7/16  
(11)  
1-1/4  
(32)  
5-3/16 (132)  
TOP VIEW  
SIDE VIEW  
POWER END VIEW  
M3851  
Fig. 4. M7215, M7415A, and M8405A Damper Motor dimensions in in. (mm).  
Table 1. M7415A/M7405A Actuator Specifications.  
Power (Vac)  
Torque  
Timing  
Voltage (Vac)  
50/60 Hz  
Stroke  
(°)  
Open Rotation  
(lb-in.) (Nm) (Shaft End View) (Shaft End View)  
Spring Return  
a
Model Number  
(Drive) (Hold) (sec)  
b,c  
24  
24  
24  
24  
24  
8
5
3
5
5
5
90  
90  
90  
90  
90  
90  
90  
90  
90  
90  
25  
25  
25  
25  
44  
2.8  
2.8  
2.8  
2.8  
5
ccw  
cw  
M7415A  
b,d  
7
ccw  
cw  
M8405A  
b,c  
8
cw  
ccw  
cw  
M7415B  
b,c  
8
ccw  
M7215A  
a,b,c,e  
13  
cw/ccw  
cw/ccw  
MS7505  
a
Timing with 60 Hz power.  
Spring return.  
b
c
d
e
Modulating.  
Three-position with field adjustable minimum position control.  
Mounts directly on damper shaft.  
Control Range, Element Temperature and Differential:  
See Table 2.  
T6031H Thermostat  
A standard spdt switch, without a case, that acts as a  
changeover thermostat.  
Approval:  
Underwriters Laboratories Inc. Listed:  
File E4436, Vol. 4, Guide No. XAPX2.  
Electrical Rating:  
0.25A at 1/.4V to 12 Vdc inductive load.  
Dimensions:  
See Fig. 5.  
5
63-2484—2  
SOLID STATE ECONOMIZER SYSTEM  
3/4 (19)  
MOUNTING  
1
HOLES  
4-1/16  
(103)  
4-3/16  
(106)  
OVERALL LENGTH: 5 (127)  
2-3/16  
(56)  
OVERALL DEPTH LESS  
ADJUSTING DIAL SHAFT:  
2-1/8 (54)  
ON THE 114496 BRACKET, THE MOUNTING HOLES ARE TWO  
1
NO. 8-32 TAPPED HOLES. THE 107940 BRACKET IS MOUNTED  
WITH A 5/32 (4) DIAMETER HOLE AT THE TOP AND A VERTICAL  
5/32 X 5/16 (4 X 8) SLOT AT THE BOTTOM.  
M9090  
Fig. 5. Approximate dimensions of back mounting bracket  
for T6031H in in. (mm).  
7/8 (22)  
W7459A,C Solid State Economizer Logic Module  
Used with C7400 Sensor or C7650A Sensor and M7415 or  
M8405 Actuator to proportion outdoor and return air dampers  
for economizer control in commercial HVAC equipment.  
2-13/16 (71)  
1-1/4  
(32)  
Electrical Ratings:  
Input Voltage: 24 Vac, 50/60 Hz.  
Power Consumption: 5.5 VA.  
5/8  
(16)  
Relay Contact Rating at 24 Vac: 1.5A run, 3.5A inrush.  
Temperature Ratings:  
-25°F to +125°F (-32°C to +52°C).  
M9085A  
Fig. 6. Approximate dimensions of W7459 Solid State  
Economizer Logic Module in in. (mm).  
Approval:  
Underwriters Laboratories Inc.: Flammability Rating: UL94V-5V.  
Specifications:  
See Table 3.  
SPECIFICATIONS: W7212A LOGIC MODULE  
Dimensions:  
See Fig. 6.  
Models: W7212A, W7213A, W7214A Logic Modules: for use  
with any Honeywell 2-10 Vdc actuator; includes DCV input;  
adjustable exhaust fan setpoint.  
NOTES:  
—
All models include a minimum damper position  
potentiometer, and setpoints for: occupied/unoccu-  
pied control, DCV operation, and DCV maximum.  
Occupied/Unoccupied overrides minimum damper  
position setting when building is unoccupied.  
—
Dimensions: See Fig. 7.  
Electrical Ratings:  
Input Voltage: 24 Vac ±20%; 50/60 Hz (Class 2). Nominal  
Power Consumption (at 24 Vac, 60 Hz): 11.5 VA.  
Relay Contact Rating at 30 Vac (maximum power from class 2  
input only): 1.5A run, 3.5A inrush.  
63-2484—2  
6
 
SOLID STATE ECONOMIZER SYSTEM  
IMPORTANT  
All inputs and outputs must be 24 Vac Class 2.  
C7400 Solid State Enthalpy Sensor.  
C7650 Dry Bulb Temperature Sensor.  
S963B1128 Remote Potentiometer to provide remote control of  
damper minimum position.  
Ambient Ratings:  
Temperature: -40°F to +149°F (-40°C to +65°C). Humidity: 5 to  
95 percent RH (noncondensing).  
ST6008 Energy Management Timer for occupied/unoccupied  
control.  
Inputs:  
4-3/8 (112)  
Enthalpy (C7400)  
Dry Bulb Temperature (C7650)  
Discharge Air (C7046)  
Mixed Air (C7150)  
DCV Sensor (C7232): 0/2-10 Vdc control signal;  
100K ohm input impedance.  
1-5/8  
(41)  
Outputs:  
Actuator Signal: 2-10 Vdc. Minimum Actuator Impedance: 1K  
ohm.  
2-1/16  
(53)  
Exhaust Fan: Contact closure.  
24 Vac Out: 25 VA maximum.  
1-15/16  
(49)  
Approvals:  
Underwriters Laboratories Inc.: UL873 listed.  
Flammability Rating: UL94-5VB.  
4-1/8  
(104)  
Plenum Rated.  
CE.  
C-tick.  
Accessories:  
4074EJM Bag Assembly. Consists of: Checkout jumper, 620  
ohm, 1.2K ohm, 5.6K ohm, and 6.8K ohm checkout resis-  
tors.  
1/8 (4)  
2-5/8 (66)  
M20578B  
C7046A Discharge Air Temperature Sensor. C7150B Mixed Air  
Temperature Sensor.  
C7232A,B Carbon Dioxide Sensors.  
Fig. 7. Logic module dimensions in in. (mm).  
Table 2. T6031H Thermostat Specifications.  
Max Element  
Temperature  
Control Range  
Differential  
°F °C  
2°  
Capillary Length  
ft  
Bulb Size  
mm  
3/8 x 3-1/2 10 x 89  
Model  
Number  
Type of  
Mounting  
°F  
°C  
°F  
°C  
66°  
m
in.  
T6031H  
0° to 95°  
-18° to +35° 150°  
3°  
Back  
2
0.6  
Table 3. W7459A,C,D Specifications.  
Discharge Air Minimum Position  
For Use with  
Actuator  
Terminals for Remote  
Output  
Model  
Temperature Input Potentiometer Adjustment Minimum Damper Position Relays  
W7459A M7415  
W7459C M8405  
Thermistor Sensor  
Spst control  
Yes  
Yes  
No  
2 spdt  
2 spdt  
No. Minimum position  
adjustment is built into  
M8405 Actuator  
W7212A M7215  
MS7505  
Thermistor sensor  
Yes  
Yes  
2 spdt  
4. After installation is complete, check out product opera-  
INSTALLATION: M7215, M7415, M8405  
tion as provided in these instructions.  
When Installing this Product...  
CAUTION  
1. Read instructions carefully. Failure to follow them could  
damage the product or cause a hazardous condition.  
2. Check ratings and description given in the specifications  
to make sure the product is suitable for your application.  
3. Installer must be a trained, experienced service technician.  
Electrical Shock or Equipment Damage Hazard.  
Can shock individuals or short equipment circuitry.  
Disconnect power supply before installation.  
7
63-2484—2  
 
SOLID STATE ECONOMIZER SYSTEM  
WIRING: M7215, M7415, M8405  
CAUTION  
Spring-return assembly can release.  
Leave end covers attached to the motor.  
Personal Injury Hazard.  
All wiring must comply with applicable codes and ordinances.  
Refer to Fig. 9 for typical hookup.  
Location and Mounting  
M7215  
L1  
L2  
TR  
Locate motor as close as possible to the equipment to be  
controlled. Refer to Fig. 4 for mounting dimensions.  
TR1  
IN+  
2-10  
+
–
1. Mount motor with the shaft horizontal to ensure maxi-  
VDC  
CONTROL  
mum life.  
IN–  
NOTE: Operation in other positions is possible when required  
by the application.  
OUT  
–
1
OUT  
+
METER INDICATING  
MOTOR POSITION  
(2-10 VDC)  
2. Remove crank arm (secured with two screws) from the  
motor hub.  
1
DOTTED LINE REPRESENTS INTERNAL  
IMPORTANT  
CONNECTIONS OF THE M7215 ACTUATOR.  
M17365  
Position crank arm on hub so it does not strike motor  
mounting surface during any portion of full stroke.  
See Fig. 8.  
Fig. 9. Typical M7215 wiring.  
3. Reposition the crank arm to accommodate specific  
C7046C Discharge Air Temperature Sensor  
damper requirements.  
The sensor assembly consists of an aluminum sensor probe  
(element housed internally) with attached flange that can be  
mounted on a flat duct or plenum surface, or in a 2 in. by 4 in.  
(51 by 102 mm) junction box, using two no. 8 screws.  
Connections to the sensor are made through two 6 in. (152  
mm) leadwires.  
NOTE: Crank arm position is adjustable in eight degree  
increments.  
4. Reconnect crank arm to the motor hub.  
5. If there is an excess length of linkage rod, cut it to size.  
Make necessary minor adjustments until desired opera-  
tion is obtained.  
Location  
6. Tighten all nuts and set screws.  
Locate the sensor in the air duct or plenum where it can  
sample average air temperature. Avoid locations where air  
stratification can cause sensing errors.  
Mounting  
To mount the C7046C Sensor on a flat duct or plenum surface  
(see Fig. 10):  
MAXIMUM  
OPEN  
MAXIMUM  
CLOSED  
1. Cut a 1/2 in. (13 mm) hole in the duct or plenum surface  
at the desired location.  
1
POSITION  
POSITION  
2. Insert the sensor probe into the duct or plenum hole until  
the flange rests against the duct or plenum wall.  
3. If necessary, use the flange as a template to mark and  
drill two holes for no. 8 mounting screws.  
4. Fasten the sensor to the duct or plenum surface with the  
two no. 8 sheet metal screws (not provided).  
MOTOR MOUNTING SURFACE  
CRANK ARM FIELD ADJUSTABLE IN 7.5 DEGREE INCREMENTS.  
1
M3850  
Fig. 8. Limits of crank arm rotation.  
63-2484—2  
8
 
SOLID STATE ECONOMIZER SYSTEM  
To mount the C7046C Sensor in a junction box (see Fig. 11):  
SYSTEM DUCT OR PLENUM  
1. Cut a 1/2 in. (13 mm) hole in the duct or plenum surface  
at the desired location.  
2. Remove the center rear knockout from the junction box  
and insert the sensor probe through the knockout with  
the flange flat against the junction box.  
3. Using the flange as a template, mark and drill two holes  
in the junction box and the duct or plenum surface for no.  
8 mounting screws.  
NO. 8  
MOUNTING  
SCREWS (2)  
FLANGE  
SENSOR PROBE  
4. Insert the sensor probe through both the junction box  
knockout and the 1/2 in. (13 mm) hole drilled in the duct  
or plenum and fasten the junction box and sensor to the  
duct or plenum surface with the two no. 8 sheet metal  
screws (not provided).  
1
TO APPROPRIATE  
SYSTEM COMPONENTS  
(SEE WIRING DIAGRAM)  
SENSOR WIRES WITH  
2 SOLDERLESS  
CONNECTORS  
1
SCREWS NOT PROVIDED.  
M9086  
Fig. 10. Mounting C7046C Air Temperature Sensor on duct  
or plenum.  
STANDARD 2 X 4 (51 X 102)  
OUTLET BOX (OPTIONAL)  
SENSOR PROBE  
FLANGE  
CONNECTOR  
AND  
LOCKNUT  
BLANK  
FACEPLATE  
(OPTIONAL)  
TO APPROPRIATE  
SYSTEM COMPONENTS  
(SEE WIRING DIAGRAM)  
1
SENSOR WIRES WITH 2  
SOLDERLESS CONNECTORS  
1
SCREWS NOT PROVIDED.  
SYSTEM DUCT OR PLENUM  
M9088  
Fig. 11. Mounting C7046C Discharge Air Temperature Sensor in junction box.  
Wiring  
CAUTION  
Can Cause Electrical Shock or Equipment Damage.  
Disconnect the power supply before connecting the  
wiring.  
Connect low voltage wiring from the sensor to the appropriate  
system component terminals using solderless connectors as  
shown in Fig. 10 and 11.  
Make sure wiring complies with applicable local codes,  
ordinances and regulations.  
9
63-2484—2  
SOLID STATE ECONOMIZER SYSTEM  
IMPORTANT  
Dimensions, Approximate 9.72 in. high x 3.94 in. wide x 2.95  
in. deep (247 mm high x 100 mm wide x 75 mm deep)  
Fail Safe Mode Spring Return  
Electrical Connections Enclosed screw terminal strip (22 to  
14 AWG) (Enclosed screw terminal strip [0.324 to 2.08 sq  
mm])  
Failure to follow these wiring practices can introduce  
electrical interference (noise) that can cause erratic  
system operation:  
a. Keep wiring at least one foot away from large induc-  
tive loads such as motors, line starters, lighting bal-  
lasts, and large power distribution panels.  
b. Shielded cable is required in installations where  
these guidelines cannot be met.  
c. Ground shield only to grounded controller case.  
d. Make good physical wiring connections to ensure  
good electrical connections.  
Frequency 60 Hz  
Manual operation Manual Crank  
Spring Return Direction By orientation  
Rotational Stroke 95 ±3 degrees  
Rotational Stroke Adjustment Mechanically limited 5 degree  
increments  
Shaft Adapter Type Self-centering clamping  
Compatible Damper Shafts 3/8 to 1.06 round or 3/8 to 11/16  
square (10 to 27 round or 10 to 18 square)  
Mounting Direct Coupled  
e. Make sure that building earth ground connections  
are not intermittent or missing.  
f. Mount sensor only in recommended environment.  
External Auxiliary Switches Available Yes  
Rated Torque (44 lb-in. (5 Nm)  
MS7505 Damper Actuators  
Maximum Stall Torque 75 lb-in. (8.5 Nm)  
Spring Return Torque 44 lb-in. (5 Nm)  
Maximum Noise Rating, Holding (dBA @ 1m) 20 (no audi-  
ble noise)  
Location and Mounting  
Maximum Noise Rating, Driving (dBA @ 1m) 40  
Environmental Rating NEMA2  
Ambient Temperature Range -40°F to +140°F (-40°C to  
+60°C)  
LOCATION  
Locate the actuator as close as possible to the equipment to  
be controlled. Refer to Fig. 12 for mounting dimensions.  
Storage Temperature Range -40°F to +158°F (-40°C to  
+70°C)  
Operating Humidity Range (% RH) 5 to 95% RH, non-con-  
Wiring  
Disconnect power supply before connecting wiring to prevent  
electrical shock or equipment damage. All wiring must comply  
with applicable local codes and ordinances.  
densing  
Materials Aluminum housing, Plenum rated plastic access  
cover  
Weight 6 lb (2.72 kg)  
Approvals: CE: 89/336/ECC, 73/23/EEC  
C-Tick N314  
Canadian Underwriters Laboratories, Inc. cUL C22.2 No.  
24-93  
Underwriters Laboratories, Inc. UL873, Plenum Rated  
Includes Mounting Bracket, Self-Centering Shaft Adapter,  
3mm crank  
3-15/16 (100)  
1-9/16  
(40)  
1-9/16  
(40)  
3 (76)  
MIN.  
2-1/2  
(64)  
FROM  
SHAFT  
END  
MIN.  
1-9/16  
(40)  
T6031H THERMOSTAT  
Location and Mounting  
9-3/4  
(247)  
6-1/8  
(156)  
The T6031H Thermostat mounts either vertically or horizontally  
on a wall or panel. Locate the remote bulb as far from the  
controller as capillary tubing allows.  
Mounting Sensing Elements  
T6031H: Install the bulb in the return airflow where air of  
average temperature can circulate around it.  
IMPORTANT  
2-15/16 (75)  
Do not overtighten clamps to the point of distorting  
the sensor bulb because overtightening causes a sig-  
nificant shift in bulb calibration.  
1/4 (6)  
3 (76)  
MIN.  
Mounting Thermostat  
Mount the thermostat using the back mounting plate as shown  
in Fig. 5.  
M20952  
Fig. 12. MS7505 Dimensions Diagram.  
63-2484—2  
10  
SOLID STATE ECONOMIZER SYSTEM  
dimensions). Mount device in a location protected from rain,  
snow and direct sunlight. Secure device to sheet metal using  
the two supplied mounting screws.  
Wiring  
CAUTION  
Disconnect power supply before connecting wiring.  
Can Cause Electrical Shock or Equipment Damage.  
CAUTION  
Equipment Damage Hazard.  
Mounting screws longer than 5/8 in. can damage  
internal motor components.  
When mounting the module to an M7215 use only the  
included #6 5/8 in. thread-forming screw.  
Disconnect the power supply before connecting wiring to  
prevent electrical shock and equipment damage. All wiring  
must comply with applicable local codes and ordinances.  
Refer to Fig. 13 and the wiring diagrams furnished with the  
system equipment to complete the wiring.  
M7415, M7405 OR  
M8405 ACTUATOR  
TEMPERATURE  
RISE  
SETPOINT  
SWITCH  
BREAKS R-B;  
MAKES R-W  
ON RISE  
DIFFERENTIAL  
SETPOINT  
FOR T6031H  
MAKES R-B;  
BREAKS R-W  
ON FALL  
W
B
R
W7459  
ECONOMIZER PACKAGE  
M9091  
Fig. 14. Mounting W7459 on M7415 or M8405 Damper  
Actuator.  
R AND W LOCATIONS  
DEPEND ON MODEL  
AND CONSTRUCTION  
M9089  
Fig. 13. T6031H switch terminal arrangement and  
switching.  
M7215 DAMPER MOTOR  
W7459A,C AND W7212 Solid State  
Economizer Logic Module  
ECONOMIZER  
LOGIC MODULE  
Location and Mounting W7459 Economizer  
Logic Module  
Mount the W7459 Economizer Logic Module on the side of the  
M7415 or M8405 Damper Actuator. When planning the  
installation, allow enough clearance for maintenance and  
service. Install the W7459 Economizer Logic Module where it  
is protected from rain and snow. One mounting screw is  
supplied to secure the W7459 to the actuator (after the  
actuator is mounted). See Fig. 14.  
5/8 INCH SCREW INCLUDED WITH LOGIC MODULE. M20717B  
Location and Mounting W7212  
The logic modules mount on an M7215 or a sheet metal duct  
or panel. When planning the installation, allow enough  
clearance for maintenance and service (see Fig. 15 and 16 for  
Fig. 15. Direct mounting of module.  
11  
63-2484—2  
SOLID STATE ECONOMIZER SYSTEM  
4500  
4000  
3500  
3000  
2500  
2000  
1500  
1000  
3,000 OHMS AT  
77F (25C)  
55  
60  
15  
65  
70  
75  
80  
85  
30  
90  
95  
35  
100  
F
20  
25  
C
TEMPERATURE (DEGREES)  
M20601  
M9099  
Fig. 16. Mounting the W7212 module on sheet metal.  
Fig. 17. C7046C and C7150B Air Temperature Sensors  
resistance versus temperature.  
C7400 Enthalpy Sensor and C7650A  
C7400A Solid State Enthalpy Sensor  
Temperature Sensor Location and Mounting  
The C7400A Solid State Enthalpy Sensor is used with a solid  
state economizer control and damper actuator to proportion an  
outdoor air damper in a ventilation system.  
Outdoor air sensing: Mount the C7400 Enthalpy Sensor or  
C7650A Temperature Sensor in any orientation where it is  
exposed to freely circulating air but protected from rain, snow  
and direct sunlight.  
Figure 18 is a partial psychometric chart with single C7400A  
Sensor and W7459A Economizer Logic Module performance  
curves. The curves illustrate the reset in the temperature  
control point due to changes in relative humidity.  
Return air sensing: For differential enthalpy or temperature  
control, a second C7400 Enthalpy Sensor or C7650A  
Temperature Sensor is connected to the W7459 or W7212.  
Mount the second sensor in the return air duct as far as  
possible from the outdoor air sensor.  
The enthalpy control setpoint A,B,C or D combines  
temperature and humidity conditions, resulting in the control  
curve shown in Fig. 18. When the enthalpy or outdoor air is  
below (left of) the appropriate curve, the outdoor air damper  
can proportion open on a call for cooling. If outdoor air enthalpy  
rises above (to the right of) the control curve, the outdoor air  
damper closes to the minimum position.  
Wiring  
For differential enthalpy, turn the control setpoint to D (fully  
clockwise). If outdoor air enthalpy is lower than return air enthalpy,  
the outdoor air damper proportions open on a call for cooling.  
CAUTION  
Can Cause Electrical Shock or Equipment Damage.  
Disconnect power supply before connecting wiring.  
If outdoor air is higher enthalpy than return air enthalpy, the  
outdoor air damper closes to minimum position. Differential  
enthalpy control provides energy savings and increased  
comfort by using the air with the lowest enthalpy.  
Disconnect the power supply before connecting wiring to  
prevent electrical shock or equipment damage. All wiring must  
comply with applicable local codes, ordinances and  
regulations.  
If outdoor air enthalpy and return air enthalpy are equal, the  
outdoor air damper proportions open on a call for cooling.  
The relationship between the C7400A Sensor output current  
and relative humidity is shown in Fig. 19.  
OPERATION AND CHECKOUT  
C7046C (Discharge) and C7150B (Mixed) Air Sensors  
C7650A Solid State Temperature Sensor  
The C7046C discharge air sensor is applied following the coils  
in the supply air to the conditioned space. The C7150B mixed  
air sensor is mounted in the mixing box, where the “best”  
combination of outdoor and return air temperature can be  
measured. Use either a discharge or a mixed air sensor to  
provide input to the economizer module through T and T1  
Terminals.  
The C7650A Solid State Temperature Sensor is used with a  
solid state economizer control and damper actuator to  
proportion an outdoor air damper in a ventilation system.  
When outdoor air temperature is higher than return air  
temperature, the outdoor air damper closes to the minimum  
position. When the outdoor air temperature and the return air  
temperature are equal, the outdoor air damper proportions  
open on a call for cooling.  
The relationship between the C7650A Sensor output current  
and the air temperature is shown in Fig. 20.  
63-2484—2  
12  
 
SOLID STATE ECONOMIZER SYSTEM  
85  
90  
95 100 105 110  
(29) (32) (35) (38) (41) (43)  
CONTROL CONTROL POINT  
CURVE  
APPROX. °F (°C)  
AT 50% RH  
80  
(27)  
A
B
C
D
73 (23)  
70 (21)  
67 (19)  
63 (17)  
75  
(24)  
70  
(21)  
65  
(18)  
60  
(16)  
A
55  
(13)  
B
50  
(10)  
C
45  
(7)  
D
40  
(4)  
35  
(2)  
1
A
B
C
D
35  
(2)  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
95 100 105 110  
(4) (7) (10) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)  
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)  
HIGH LIMIT CURVE FOR W7210D, W7212, W7213, W7214, W7340B.  
M11160C  
1
Fig. 18. Partial psychrometric chart with single C7400A Solid State Enthalpy Sensor and W7212 or W7459 Solid State  
Economizer Logic Module performance curves.  
C7400A OUTPUT CURRENT  
100  
19  
LED ON  
18  
17  
16  
15  
14  
90  
80  
70  
60  
D
LED ON  
LED OFF  
C
LED ON  
LED OFF  
B
13  
12  
50  
40  
LED ON  
LED OFF  
A
11  
10  
9
30  
20  
10  
LED OFF  
95  
85 90  
F
100  
40  
60  
65  
45  
50  
55  
70  
75  
80  
NOTE: A,B,C,D ARE W7459 SWITCHING SETPOINTS.  
40  
(4)  
50  
(10)  
60  
(16)  
70  
(21)  
80  
(27)  
90  
(32)  
100  
(38)  
M7578A  
TEMPERATURE F (C)  
M9101  
Fig. 20. C7650A Solid State Temperature Sensor output  
current vs. temperature.  
Fig. 19. C7400A Sensor output current vs. relative  
humidity.  
13  
63-2484—2  
SOLID STATE ECONOMIZER SYSTEM  
The economizer functions as a true first stage of cooling and  
provides maximum fuel economy during the cooling cycle. The  
economizer is automatically locked out during heating. It holds  
the outdoor air damper at the minimum position setting. On a  
call for cooling by the space thermostat, the system operates  
as follows:  
M7415 Damper Actuator  
Single M7415 Damper Actuator accepts thermistor sensor  
input from a C7046A or a C7150B Mixed Air Sensor mounted  
in discharge or mixed air duct. See Fig. 27.  
During the occupied period, on a call for cooling, when outdoor  
air temperature or enthalpy conditions are low, the M7415  
Actuator proportions to maintain between 50°F (10°C) and  
56°F (13°C) at the thermistor sensor.  
When the enthalpy or temperature of the outdoor air is below  
the setpoint, the outdoor air damper is proportioned open (and  
the return air damper is proportioned closed) to maintain  
between 50°F and 56°F (10°C and 13°C) at the mixed/  
discharge air sensor. During economizer operation, the  
mechanical cooling is operated by stage 2 cooling on the  
space thermostat.  
If the mixed or discharge temperature is above 56°F (13°C),  
the M7415 Actuator opens to admit additional outdoor air until  
the temperature returns to the 50°F (10°C) to 56°F (13°C)  
range. If the mixed or discharge air temperature is below 50°F  
(10°C), the actuator proportions closed, shutting the outdoor  
air damper until the temperature returns to the 50°F (10°C) to  
56°F (13°C) range. During the occupied period, the actuator  
does not close past the minimum position.  
When the enthalpy or temperature of the outdoor air is above  
the setpoint, the outdoor air damper closes to its minimum  
position. A call for cooling from the space thermostat turns on  
the mechanical cooling.  
If the fully open M7415 Actuator cannot satisfy the space  
demand, mechanical cooling is sequenced on.  
During the unoccupied period, the M7415 Damper Actuator  
spring-returns the outdoor air damper to the fully closed  
position.  
During the unoccupied period, the M7415 Actuator overrides  
the minimum position setting and drives fully closed. On a loss  
of power, the actuator spring-returns fully closed.  
W7212A Economizer Logic Module  
W7212A economizer logic module used with C7400 enthalpy  
If terminals P and P1 are jumpered, the M7415 drives fully  
open; however, if terminals P and P1 are left open, the M7415  
drives fully closed. The M7415 minimum position adjustment  
drives the motor open when the resistance across P and P1 is  
minimal. Increasing the amount of resistance across these  
terminals drives the actuator closed.  
sensors, M7215 or MS7505 damper actuators and C7232 CO  
sensors to proportion outdoor and return air dampers from  
economizer and demand control ventilation in commercial  
HVAC equipment.  
2
W7212A Optional Applications  
M8405 Damper Actuator  
HEAT PUMP CHANGEOVER (W7213, W7214 ONLY)  
In heat pump applications, the controller must have control of  
the changeover valve. To provide the logic module with the  
An spst low-voltage controller is used to control the M8405  
Actuator as follows:  
information necessary for proper information, there must be a  
connection to the logic module O/B terminal. This terminal  
alerts the logic module as to when the system operates in  
cooling (the only time the economizer is used).  
a. Fully open—when the controller circuit closes to pro-  
vide 24 Vac to terminals D and T, the actuator is  
energized and runs fully open.  
b. Fully closed—when the controller circuit opens,  
power is removed from terminals D and T, and the  
actuator spring-returns to the fully closed position.  
c. Mid-position—when the controller circuit closes to  
provide 24 Vac to terminals T and X, the actuator is  
energized to run to the adjustable mid-position (mini-  
mum position).  
W7213 (CHANGEOVER TERMINAL B)  
Connect the B terminal according to the following details:  
— 24V power to B: System is in heating mode.  
— No power to B: System is in cooling mode.  
W7214 (CHANGEOVER TERMINAL O)  
Adjustable minimum position can be reached from either the  
fully closed or fully open position. From fully closed, the  
actuator drives open to the minimum position; from fully open,  
the actuator spring-returns to minimum position.  
Connect the O terminal according to the following details:  
— 24V power to O: System is in cooling mode.  
— No power to O: System is in heating mode.  
SETTINGS AND ADJUSTMENTS  
W7459A,C Solid State Economizer Logic  
Module  
Adjusting Minimum Damper Position  
The purpose of an economizer is to use outdoor air for cooling  
whenever possible, to reduce air conditioner compressor  
operation. The W7459 Economizer System, when wired as  
shown in Fig. 27, responds to a signal from the cooling  
thermostat. This system uses a C7400 Enthalpy Sensor or a  
C7650A Temperature Sensor. It responds to both dry bulb  
temperature and humidity, allowing the use of outdoor air at  
higher temperatures for free cooling when the humidity is low.  
The minimum position potentiometer keeps the outdoor air  
damper from completely closing during system operation to  
allow ventilation.  
63-2484—2  
14  
 
SOLID STATE ECONOMIZER SYSTEM  
M7415 and M8405 Damper Actuators  
W7459A,C Solid State Economizer Logic  
Module  
Adjusting Minimum Position (Ventilation)  
The M7415 Damper Actuator is adjusted for desired minimum  
position using a Q709 Actuator Mounted Minimum Position  
Potentiometer and/or a remote S963B1136 Manual  
Potentiometer. The M8405 Damper Actuator has an integral  
thumbwheel for minimum position adjustment.  
Two potentiometers with small screwdriver slots for adjustment  
are located on the face of the module.  
Minimum Position Adjustment  
W7459A ECONOMIZER LOGIC MODULE  
M7415 Minimum Position Adjustment  
1. Make sure the factory-installed jumper is in place  
across terminals P and P1 (terminals T and T1 are  
disconnected.  
2. Connect 24 Vac at terminals TR and TR1 and adjust the  
potentiometer on the face of the W7459A with a small  
screwdriver for desired minimum position.  
1. Run actuator to fully closed position and disconnect 24  
Vac from terminals TR and TR1.  
2. Connect minimum position potentiometer to terminals P  
and P1 (T and T1 are disconnected).  
3. Reconnect 24 Vac to terminals TR and TR1 and adjust  
the potentiometer for the desired minimum position.  
4. When the Q709 Actuator Mounted Minimum Position  
Potentiometer is used and a remote potentiometer is not  
connected in series, jumper terminals P and P1 on the  
Q709A.  
W7459C ECONOMIZER LOGIC MODULE  
1. Connect 24 Vac at terminals TR and X (D is not connected).  
2. Adjust thumbwheel on motor for desired minimum position.  
M8405 Minimum Position Adjustment  
Enthalpy Changeover Setpoint  
1. Connect the 24 Vac to the actuator at terminals T and X  
(D is not connected).  
Single enthalpy: the enthalpy changeover setpoint is set to  
return the outdoor air damper to the minimum position when  
the enthalpy rises above its setpoint. The enthalpy setpoint  
scale markings, located on the W7459, are A, B, C, D; see Fig.  
18 for the corresponding control point. The factory-installed  
2. Adjust the thumbwheel on the actuator for desired  
minimum position.  
Discharge Air Temperature Setpoint  
Adjustment—M7415 Only  
620-ohm jumper must be in place across terminals + and S .  
R
This temperature range can be adjusted either up or down by  
wiring a resistor in series (to increase the setpoint) or in parallel  
(to decrease the setpoint) with the C7150B, depending on the  
application. See Fig. 21 and 22 for explanation.  
ENTHALPY  
CHANGEOVER  
SETPOINT  
R
T
C7150  
T1  
M7415  
MINIMUM  
DAMPER  
RESISTOR VALUE (OHMS)  
C7150B SETPOINT °F (°C)  
POSITION  
SETTING  
1
681  
2760  
54.5—61.5 (12.5—16.4)  
68.4—80.1 (20.3—26.8)  
87.4—110.3 (30.8—45.5)  
104.7—150 (40.4—65.5)  
116—194 (46.7—90)  
120—300 (49—149)  
3650  
LED LIGHTS  
4420  
WHEN OUTDOOR  
AIR IS SUITABLE  
FOR FREE COOLING  
4750  
4870  
NO RESISTOR  
50—56 (10—13.3)  
USE 1%, 1/8 W OR HIGHER RESISTOR  
M1544C  
Fig. 21. Increasing C7150B setpoint.  
1
MINIMUM DAMPER POSITION ADJUSTMENT  
IS PRESENT ONLY ON W7459A,D MODELS.  
M9098B  
T
R
Fig. 23. Location of enthalpy setpoint potentiometer,  
minimum position potentiometer and LED.  
C7150  
T1  
M7415  
Differential Enthalpy Changeover Setting  
RESISTOR VALUE (OHMS)  
C7150B SETPOINT °F (°C)  
18.2K  
24K  
36—44 (2.2—6.7)  
39.5—47 (4.0—8.3)  
42—49 (5.6—9.4)  
50—56 (10—13.3)  
(USE THIS OPTION ONLY WITH TWO-STAGE COOLING  
THERMOSTATS.)  
Differential enthalpy control uses two C7400 Enthalpy Sensors  
or two C7650A Temperature Sensors connected to one W7459  
Solid State Economizer Logic Module.  
30K  
NO RESISTOR  
USE 1%, 1/8 W OR HIGHER RESISTOR  
M1545C  
Fig. 22. Decreasing C7150B setpoint.  
15  
63-2484—2  
SOLID STATE ECONOMIZER SYSTEM  
The setpoint scale markings, located on the W7459, are A,B,C  
and D. Turn the setpoint potentiometer fully clockwise to the D  
setting. The economizer selects the air that has lower enthalpy  
or temperature for cooling; for example, if outdoor air has lower  
enthalpy or temperature than return air, the outdoor air damper  
is opened to bring in outdoor air for free cooling.  
3.  
a. On the standard (non-differential) economizers, the  
logic module checks the outdoor air C7400 Enthalpy  
Sensor or C7650 Temperature Sensor to determine if  
the enthalpy or temperature is below the setpoint.  
b. On the differential economizers, the logic module  
checks to determine if the outdoor air temperature is  
below the return air temperature.  
Remote Minimum Position Control  
4. If the logic module uses the outside air for cooling, the  
mixed air sensor prevents the entering air from going  
below 50°F (10°C).  
Remote control of outdoor air dampers is desirable when  
requiring temporary additional ventilation. The addition of a  
S963B1128 Remote Potentiometer allows occupants to open  
or close the dampers beyond minimum position for modified  
ventilation.  
a. On the modulating system, the control closes the  
outside air damper and opens the return air damper  
to mix the outside air and return air to maintain 50°–  
55°F (10°–13°C).  
b. On the three-position system, the mixed air sensor  
switch opens, closing the fresh air damper until the  
mixed air sensor temperature returns above 55°F  
(13°C), closing the switch and re-opening the outside  
air damper.  
SEQUENCE OF OPERATION  
Economizer Sequence of Operation  
5.  
a. If the logic module senses that the outside air is not  
suitable for cooling, the air conditioning unit com-  
pressor is energized and the space is cooled with  
refrigerated air.  
(WITH AND WITHOUT DIFFERENTIAL ENTHALPY)  
The economizer operating sequence for both the modulating  
and the three-position control systems are identical when the  
outdoor enthalpy temperature is above the mixed air setpoint  
of 55°F (13°C). The operating sequence for both, using a  
standard two-stage thermostat is:  
b. On the two-stage thermostat, the economizer is the  
first stage if the outside air temperature is suitable for  
cooling. The compressor on the unit is energized if  
the second stage of the thermostat is energized,  
thereby creating an integrated economizer.  
6. Refer to Table 4 for further information on outside air  
damper positions.  
1. The first stage of the thermostat signals a need for  
cooling.  
2. The W7459 Solid State Economizer Logic Module  
begins to make decisions regarding the unit/  
economizer operation.  
Table 4. Outdoor air damper positions.  
Standard Economizer Damper Position  
Differential Enthalpy Damper Position  
Return  
Outside  
1
2
2
1
2,3  
2,3  
Temperature  
Modulating  
Closed  
3-Position  
Closed  
Temperature  
80  
Modulating  
Closed  
3-Position  
Closed  
80  
85  
75  
80  
75  
Open  
Closed  
Open  
Open  
Open  
Closed  
Open  
Open  
75  
Closed  
Closed  
70  
Open  
Open  
Open  
Open  
Open  
65  
Open  
60  
Open  
75  
75  
75  
Open  
Open  
Open  
55  
Open  
Open  
54 and down  
Modulating  
Opening/Closing  
Modulating  
Opening/Closing  
1
2
3
Standard economizer position based on enthalpy control set on the A setting and 50% relative humidity.  
Closed position is either the minimum position or fully closed, depending on the job setting.  
Opening/closing is dependent on the mixed air temperature.  
63-2484—2  
16  
 
SOLID STATE ECONOMIZER SYSTEM  
Dry Bulb Temperature Sensor(s). The C7400 responds to both  
dry bulb temperature and humidity, allowing use of outdoor air  
at higher temperatures for free cooling when humidity is low.  
The C7650 responds only to dry bulb temperature; use only in  
dry, arid climates.  
OPERATION: W7212  
The purpose of the economizer is to use outdoor air for  
cooling, whenever possible, to reduce compressor operation.  
Power at the N terminal determines the Occupied/Unoccupied  
setting:  
The logic module functions as a true first stage of cooling  
providing maximum energy economy during the cooling cycle.  
It automatically locks out free cooling during heating; holding  
the outdoor air damper at the minimum position setting.  
— W7212:  
•
24 Vac (Occupied).  
The logic module can operate as either a basic free cooling  
controller, or it can incorporate additional functions. Table 5  
details the input/output (I/O) logic of the module.  
•
No power (Unoccupied).  
— W7213,W7214:  
•
W7213 (CHANGEOVER TERMINAL B)  
— 24V power to B: System is in heating mode.  
— No power to B: System is in cooling mode.  
W7214 (CHANGEOVER TERMINAL O)  
— 24V power to O: System is in cooling mode.  
— No power to O: System is in heating mode.  
•
S963B1128 REMOTE  
POTENTIOMETER  
MINIMUM  
R
CW  
CLOSE  
POSITION  
P1  
ADJUSTMENT  
NOTE: When module is operating in Occupied mode, the  
minimum position is defined by the potentiometer.  
When the module is operating in Unoccupied mode,  
and there is no call for cooling, the damper drives fully  
closed.  
P
B
W
CW  
ECONOMIZER  
M20603A  
When wired as shown in Fig. 28–33, the logic module  
responds to the cooling thermostat signal. The system uses  
C7400 Solid State Enthalpy Changeover Sensor(s) or C7650  
Fig. 24. S963B1128 Remote Potentiometer used with logic  
module for remote damper control.  
Table 5. W7212 Economizer I/O Logic.  
INPUTS  
Enthalpy  
OUTPUTS  
a
b
Compressor  
N Terminal  
b
b
Occupied  
Unoccupied  
Demand Control  
Ventilation (DCV)  
Outdoor  
High (Free  
Cooling LED Off)  
Return  
Y1  
On  
Y2 Stage 1 Stage 2  
Damper  
Closed  
Below set (DCV  
LED Off)  
Low  
On  
Off  
Off  
On  
Off  
On  
On  
Off  
On  
Off  
On  
Off  
Off  
Off  
Off  
Minimum position  
On  
Off  
On  
On  
c
c
Low (Free  
Cooling LED On)  
High  
Modulating (between Modulating (between  
min. position and full- closed and full-open)  
open)  
Off  
On  
On  
Off  
On  
On  
Off  
Off  
On  
Off  
Off  
On  
Off  
Off  
Off  
On  
On  
Off  
On  
Off  
Off  
Off  
On  
Off  
Off  
Off  
Off  
Off  
Minimum position  
Closed  
d
d
Above set (DCV  
LED On)  
High (Free  
Cooling LED Off)  
Low  
Modulating (between Modulating (between  
min. position and DCV closed and DCV  
maximum)  
maximum)  
e
f
Low (Free  
Cooling LED On)  
High  
Modulating  
Modulating  
a
For single enthalpy control, the module compares outdoor enthalpy to the ABCD setpoint.  
b
Power at N terminal determines Occupied/Unoccupied setting:  
• W7212: 24 Vac (Occupied), no power (Unoccupied).  
• W7213,W7214: No power (Occupied), 24 Vac (Unoccupied).  
c
d
e
Modulation is based on the mixed air sensor signal.  
Modulation is based on the DCV signal.  
Modulation is based on the greater of DCV and mixed air sensor signals, between minimum position and either maximum posi-  
tion (DCV) or fully open (mixed air signal).  
f
Modulation is based on the greater of DCV and mixed air sensor signals, between closed and either maximum position (DCV) or  
fully open (mixed air signal).  
17  
63-2484—2  
 
SOLID STATE ECONOMIZER SYSTEM  
NOTES:  
—
—
DCV and Free Cooling have setpoints and LED indications.  
For models with a B terminal (W7213):  
No power to B: cooling mode, free cool enabled. Module follows logic detailed above.  
24V power to B: heating mode, free cool disabled. Actuator drives to minimum position (closed when Unoccupied).  
For models with an O terminal (W7214):  
—
24V power to O: cooling mode, free cool enabled. Module follows logic detailed above.  
No power to O: heating mode, free cool disabled. Actuator drives to minimum position (closed when Unoccupied).  
limit the amount of outdoor air flow into the building when the  
SETTINGS AND ADJUSTMENTS: W7212  
DCV overrides the mixed air sensor and allows the proper  
ventilation based on occupancy. Setting the DCV maximum  
position of the damper prevents the introduction of large  
amounts of hot or cold air into the space by preventing the  
dampers from opening 100%. Set the DCV maximum position  
at the maximum design occupancy.  
CAUTION  
Equipment Damage Hazard.  
Excessive force can damage potentiometer  
controls.  
Use a small screwdriver when adjusting enthalpy  
IMPORTANT  
With the DCV maximum position set below the mini-  
mum position, the minimum position overrides the  
maximum position (negating most DCV functions of  
the logic module, as the damper cannot move).  
changeover and minimum damper position controls.  
Potentiometers with small screwdriver adjustment slots,  
located on device face, provide adjustments for several  
parameters (see Fig. 25 for locations on device):  
NOTES:  
—
When the mixed air sensor takes control based on  
an increased requirement for cooling, it overrides  
the DCV maximum position potentiometer and can  
drive the damper full-open.  
If the mixed air temperature drops to 45°F, the  
mixed air sensor overrides the DCV and fully  
closes the damper to protect from freezing the hot  
or chilled water coils. Control returns to normal  
once the mixed air temperature rises to 48°F.  
— DCV setpoint.  
— Minimum damper position.  
— DCV maximum damper position.  
— Enthalpy changeover.  
— Exhaust setpoint.  
—
EXHAUST  
FAN SETPOINT  
EXH  
N1  
LED LIGHTS  
Set  
N
2V  
10V  
WHEN EXHAUST  
CONTACT IS MADE  
Minimum Position Adjustment  
EXH  
P1  
T1  
MINIMUM DAMPER  
POSITION SETTING  
For detailed assistance in minimum position selection  
reference the Economizer Application Guide (form 63-8594)  
Ventilation section. The following provides basic guidelines for  
minimum position selection and adjustment:  
P
T
Min  
Pos  
MAXIMUM DAMPER  
DEMAND CONTROL  
VENTILATION SETPOINT  
Open  
DCV  
Max  
LED LIGHTS WHEN  
DEMAND CONTROL  
VENTILAION INPUT  
IS ABOVE SETPOINT  
2V  
10V  
AQ1  
IMPORTANT  
DCV  
AQ  
SO+  
SO  
SR+  
SR  
DCV  
Set  
10V  
•
Adjust the minimum position potentiometer to allow  
the minimum amount of outdoor air for building efflu-  
ents, as required by local codes, to enter the building.  
This procedure requires use of a quality thermometer  
capable of reading to 0.5°F (0.25°C).  
2V  
DEMAND CONTROL  
VENTILAION SETPOINT  
Free  
Cool  
•
B
C
D
LED LIGHTS WHEN  
OUTDOOR AIR IS  
SUITABLE FOR  
A
NOTE: Make minimum position adjustments with at least a  
10°F (6°C) temperature difference between outdoor  
and return air.  
FREE COOLING  
ENTHALPY  
M20604  
CHANGEOVER SETPOINT  
Fig. 25. Potentiometer and LED locations (W7212 shown).  
1. Calculate the appropriate mixed air temperature. See  
Equation 1.  
2. Disconnect mixed air sensor from terminals T and T1.  
3. Place a jumper across terminals T and T1.  
4. Ensure that either the factory-installed jumper is in place  
across terminals P and P1 or, if remote damper position  
is required, that it is wired according to Fig. 24 and  
turned fully clockwise.  
Demand Control Ventilation Setpoint  
The logic module modulates the outdoor damper to provide  
ventilation based on the 0/2-10 Vdc DCV. With no cooling  
signal, the DCV overrides the outdoor air damper when  
ventilation requires additional outdoor air.  
5. Connect 24 Vac across terminals TR and TR1.  
6. Carefully adjust the potentiometer on the face of the  
device with a small screwdriver until the mixed air tem-  
perature reaches the calculated value.  
Adjusting Minimum and Maximum Positions  
The minimum position potentiometer maintains the minimum  
outdoor air flow into the building during the occupied period.  
The minimum position allows for the building effluents. The  
DCV maximum position potentiometer allows the installer to  
NOTE: Ensure that the sensed air is well-mixed.  
63-2484—2  
18  
 
SOLID STATE ECONOMIZER SYSTEM  
7. If all minimum and maximum position adjustments are  
complete, remove the T-T1 jumper and reconnect the  
mixed air sensor.  
NOTE: Turn the enthalpy setpoint potentiometer fully clock-  
wise to the D setting.  
The logic module selects the lower enthalpy air (return or  
outdoor) for cooling. For example, when outdoor air has lower  
enthalpy than return air, the module calls to open the outdoor  
air damper to bring in outdoor air for free cooling.  
EQUATION 1. FORMULA TO AID MINIMUM POSITION ADJUSTMENT.  
(T × OA)+(T × RA)= T  
O
R
M
Where:  
= Outdoor air temperature  
OA = Percent of outdoor air  
T
O
Exhaust Setpoint  
T = Return air temperature  
The exhaust setpoint determines when the exhaust fan runs  
based on damper position. When the exhaust fan call is made,  
the module provides a 60 ±30 second delay before exhaust fan  
activation. This delay allows the damper to reach the  
R
RA = Percent of return air  
T
= Resulting mixed air temperature  
M
NOTE: The following sample calculation uses only Fahren-  
heit temperature.  
appropriate position to avoid unnecessary fan overload.  
NOTES:  
EXAMPLE: Assume local codes require 10% outdoor air dur-  
ing occupied conditions, outdoor air is 60°F and  
return air is 75°F. Under these conditions, what is  
the temperature of the mixed air?  
—
EF and EF1 are 24V dry contacts only. An external  
line voltage contactor is required to operate the  
exhaust fan.  
When the exhaust fan is deactivated the EF and  
EF1 contacts open immediately.  
—
(0.1 × 60°F)+(0.9 × 75°F)=6.0°F + 67.5°F=73.5°F  
Mixed air will be 73.5°F when OA is 60°F and RA is 75°F with  
10 percent outdoor air entering the building.  
CHECKOUT AND TROUBLESHOOTING  
Tables 6 through 10 provide step-by-step economizer checkout  
and troubleshooting steps. See Fig. 23 and 25 for enthalpy  
setpoint potentiometer, minimum position potentiometer and  
LED locations.  
DCV Maximum Position Adjustment  
1. Disconnect mixed air sensor from terminals T and T1  
and short terminals T and T1.  
2. Connect a jumper between terminals AQ and AQ1.  
3. Connect 24 Vac across terminals TR and TR1.  
4. Adjust the potentiometer on the face of the device with a  
small screwdriver for desired maximum position.  
5. If all minimum and maximum position adjustments are  
complete, remove the T-T1 jumper and reconnect the  
mixed air sensor.  
ENTHALPY CHANGEOVER  
SETPOINT  
W7459  
TR1  
TR  
+
B
C
1
+
+
S
O
R
S
+
D
A
C7400  
DC  
MILLIAMMETER  
S
2
620 OHM  
JUMPER  
Enthalpy Changeover Setpoint  
Outdoor Enthalpy Changeover Setpoint  
(Single Enthalpy)  
The outdoor enthalpy changeover setpoint returns the outdoor  
air damper to minimum position when enthalpy rises above its  
setpoint. Enthalpy setpoint scale markings, located in the  
device, are A, B, C and D. See Fig. 18 for the corresponding  
control point. The factory-installed 620-ohm jumper must be in  
place across terminals SR and SR+. Temperature and humidity  
points to the left of the selected curve will allow the dampers to  
open for free cooling.  
LED LIGHTS WHEN  
OUTDOOR AIR IS SUITABLE  
FOR FREE COOLING  
1
2
INSERT DC MILLIAMMETER BETWEEN S AND S FOR CHECKOUT  
O
AND TROUBLESHOOTING.  
M9097  
JUMPER USED FOR SINGLE ENTHALPY CONTROL.  
Differential Enthalpy Changeover Setting  
Differential enthalpy control uses two C7400 Enthalpy Sensors  
connected to one logic module. The logic module compares  
outdoor air to return air.  
Fig. 26. Meter location for checkout and troubleshooting.  
19  
63-2484—2  
 
SOLID STATE ECONOMIZER SYSTEM  
W7459C ECONOMIZER PACKAGE  
M8405 ACTUATOR  
T
M8405  
MAX  
T
TR  
TR1  
SW  
SET  
APPLY  
24VAC T-X  
MIN  
FOR MIN POSN  
C7400  
+
T-D FOR  
OUTDOOR  
MAX POSN  
SENSOR  
+
S
O
S
X
D
S
R
+
5
C7400  
S
RETURN  
SENSOR  
5
1K  
4
+
1
3
2
4
UNOCCUPIED  
2K  
ST6008  
TIMER  
X
D
X
D
OCCUPIED  
T675/T6031 MIXED  
AIR CONTROL  
6
55¡ F SETPOINT  
W
R
C
COOL 1  
COOL 2  
Y1  
Y2  
W2  
W1  
Y1  
Y2  
W
T6031 AMBIENT  
LOCKOUT CONTROL  
50¡ F SETPOINT  
R
HEAT 2  
HEAT 1  
W2  
W1  
X
FAN  
6
DELAY  
RELAY  
FDR  
G
G
1
3
FAN  
RH  
RC  
L2  
FDR  
2
R
L1  
(HOT)  
T7300 OR T874  
THERMOSTAT  
HVAC EQUIPMENT  
TERMINAL STRIP  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
MOTOR SPRING-RETURNS CLOSED WHEN FAN IS NOT RUNNING.  
3
4
5
ENSURE THAT EQUIPMENT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.  
RELAYS 1K AND 2K ACTUATE WHEN THE ENTHALPY SENSED BY THE C7400 IS HIGHER THAN THE ENTHALPY SETPOINT A-D.  
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE REMOVED ONLY IF A C7400 ENTHALPY SENSOR  
M3865B  
IS ADDED TO S AND + FOR DIFFERENTIAL ENTHALPY.  
R
6
FOR T7300 ONLY.  
Fig. 27. M8405A Damper Actuator used in two-stage cooling system with differential enthalpy changeover and W7459C  
Economizer.  
63-2484—2  
20  
SOLID STATE ECONOMIZER SYSTEM  
W7459A ECONOMIZER PACKAGE  
M7415 ACTUATOR  
TR  
24 VAC  
TR1  
TR  
TR1  
C7400  
+
OUTDOOR  
AIR  
+
+
S
S
O
R
ENTHALPY  
SENSOR  
S
620 OHM  
RESISTOR  
6
5
2
1K  
5
1
3
1S  
2K  
4
4
T
MIXED  
AIR  
T1  
T
P
T1  
P1  
SENSOR  
1S1  
C7150B MIXED  
AIR OR  
P1  
P
C7046A  
MINIMUM POSITION  
ADJUSTMENT  
MINIMUM  
POSITION  
UNOCCUPIED  
8
DISCHARGE  
AIR SENSOR  
ST6008  
TIMER  
OCCUPIED  
C
M7415  
TR  
COOL 1  
COOL 2  
HEAT 2  
HEAT 1  
W
Y1  
Y2  
W2  
W1  
24 VAC  
Y1  
Y2  
TR1  
T6031 AMBIENT  
LOCKOUT  
R
CONTROL  
SENSOR  
T
50 F SETPOINT  
T1  
W2  
P1  
P
MIN  
POS  
W1  
FAN  
G
X
DELAY  
RELAY  
7
FDR  
G
1
3
FAN  
RH  
L2  
FDR  
2
R
RC  
L1  
(HOT)  
T7300 OR T874  
THERMOSTAT  
HVAC EQUIPMENT  
TERMINAL STRIP  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
MOTOR SPRING-RETURNS CLOSED WHEN FAN IS NOT RUNNING.  
2
3
4
5
6
ENSURE THAT EQUIPMENT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.  
1S IS AN ELECTRONIC SWITCH THAT CLOSES WHEN POWERED BY A 24 VAC INPUT.  
RELAYS 1K AND 2K ACTUATE WHEN THE ENTHALPY SENSED BY THE C7400 IS HIGHER THAN THE ENTHALPY SETPOINT A-D.  
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE REMOVED ONLY IF A C7400 ENTHALPY SENSOR  
IS ADDED TO S AND + FOR DIFFERENTIAL ENTHALPY.  
R
7
8
FOR T7300 ONLY.  
M10115A  
WITH T7300, USE CONTACTS A AND A INSTEAD OF S7005 TIMER.  
1
2
Fig. 28. W7459A/C7400 used in two-stage cooling system with single enthalpy changeover and with M7415 Actuator.  
21  
63-2484—2  
SOLID STATE ECONOMIZER SYSTEM  
TR  
TR1  
N1  
N
24 VAC HOT  
24 VAC COM  
MINIMUM POSITION  
ADJUSTMENT  
24  
Vac  
24 Vac  
COM  
P1  
T1  
HOT  
P
T
C7150B MIXED  
AIR OR C7046A  
DISCHARGE  
AIR SENSOR  
+
–
2-10 VDC CONTROL  
SIGNAL INPUT  
1
2
5
AQ1  
–
+
0/2-10 VDC  
INDOOR AIR  
SENSOR  
AQ  
SO+  
SO  
SR+  
3
4
EF  
EF1  
SR  
M7215  
C7400  
W7212  
5
OUTDOOR  
AIR  
+
3
620 OHM  
L1  
ENTHALPY  
SENSOR  
S
RESISTOR  
(HOT)  
L2  
EXHAUST  
FAN  
Y1  
Y2  
C
COOL 1  
COOL 2  
Y1  
Y2  
W2  
W1  
A2  
HEAT 2  
HEAT 1  
W2  
W1  
4
A1  
G
A2  
A1  
G
RH  
FAN  
2
L2  
RC  
X
1
R
L1  
(HOT)  
HVAC EQUIPMENT  
TERMINAL STRIP  
T7300/Q7300  
THERMOSTAT  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR. USE THE SAME  
TRANSFORMER FOR T7300 AND ECONOMIZER.  
3
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE  
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.  
4
5
T7300 TERMINALS A1 AND A2 ARE CONNECTED WHEN THERMOSTAT IS IN THE OCCUPIED MODE.  
M20716D  
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.  
Fig. 29. W7212 used with M7215 Damper Motor and T7300 Thermostat.  
63-2484—2  
22  
SOLID STATE ECONOMIZER SYSTEM  
TR  
TR1  
N1  
N
24 VAC HOT  
24 VAC COM  
MINIMUM POSITION  
ADJUSTMENT  
24  
Vac  
24 Vac  
COM  
P1  
T1  
HOT  
P
T
C7150B MIXED  
AIR OR C7046A  
DISCHARGE  
+
–
2-10 VDC CONTROL  
SIGNAL INPUT  
AIR SENSOR  
1
2
5
AQ1  
–
+
0/2-10 VDC  
INDOOR AIR  
SENSOR  
AQ  
SO+  
SO  
SR+  
3
4
EF  
EF1  
SR  
M7215  
C7400  
W7212  
5
OUTDOOR  
AIR  
+
4
620 OHM  
L1  
ENTHALPY  
SENSOR  
S
RESISTOR  
(HOT)  
L2  
EXHAUST  
FAN  
Y1  
Y2  
C
COOL 1  
COOL 2  
Y1  
Y2  
W2  
W1  
HEAT 2  
HEAT 1  
W2  
3
AUX  
W1  
A2  
G
RH  
RC  
G
R
FAN  
2
L2  
1
X
L1  
(HOT)  
HVAC EQUIPMENT  
TERMINAL STRIP  
T7350  
THERMOSTAT  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.  
THE SAME TRANSFORMER CAN BE USED FOR THE THERMOSTAT AND ACTUATOR.  
IF SEPARATE HEATING AND COOLING TRANSFORMERS ARE USED, REMOVE JUMPER AT THERMOSTAT.  
T7350 - TERMINAL “AUX” IS POWERED BY THE HEATING TRANSFORMER (RH).  
3
IF POWERING THE ECONOMIZER TERMINAL “N” WITH THE THERMOSTAT TERMINAL “AUX”, BE SURE THE ECONOMIZER IS POWERED BY THE  
SAME TRANSFORMER AS TERMINAL “AUX”. IF NOT, USE AN ISOLATION RELAY TO POWER “N”.  
4
5
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE  
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.  
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.  
M13657  
Fig. 30. W7212 used with M7215 Damper Motor and T7350 Thermostat.  
23  
63-2484—2  
SOLID STATE ECONOMIZER SYSTEM  
TR  
TR1  
N1  
N
24 VAC HOT  
24 VAC COM  
MINIMUM POSITION  
ADJUSTMENT  
24  
Vac  
24 Vac  
COM  
P1  
T1  
HOT  
P
T
C7150B MIXED  
AIR OR C7046A  
DISCHARGE  
AIR SENSOR  
+
–
2-10 VDC CONTROL  
SIGNAL INPUT  
1
2
5
AQ1  
–
+
0/2-10 VDC  
INDOOR AIR  
SENSOR  
AQ  
SO+  
SO  
SR+  
3
4
EF  
EF1  
SR  
M7215  
C7400  
W7212  
5
OUTDOOR  
AIR  
+
4
620 OHM  
L1  
ENTHALPY  
SENSOR  
S
RESISTOR  
(HOT)  
L2  
EXHAUST  
FAN  
Y1  
Y2  
C
COOL 1  
COOL 2  
Y1  
Y2  
W2  
W1  
A
HEAT 2  
HEAT 1  
W2  
3
W1  
A
G
R
G
R
FAN  
2
L2  
RC  
X
1
L1  
(HOT)  
HVAC EQUIPMENT  
TERMINAL STRIP  
TB7220 OR TB8220  
THERMOSTAT  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.  
THE SAME TRANSFORMER CAN BE USED FOR THE THERMOSTAT AND ACTUATOR.  
IF SEPARATE HEATING AND COOLING TRANSFORMERS ARE USED, REMOVE JUMPER AT THERMOSTAT.  
TB7220 - TERMINAL “A” IS POWERED BY THE COOLING TRANSFORMER (RC).  
TB8220 - TERMINAL “A” IS POWERED BY THE HEATING TRANSFORMER (R).  
3
IF POWERING THE ECONOMIZER TERMINAL “N” WITH THE THERMOSTAT TERMINAL “A”, BE SURE THE ECONOMIZER IS POWERED BY THE  
SAME TRANSFORMER AS TERMINAL “A”. IF NOT, USE AN ISOLATION RELAY TO POWER “N”.  
4
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE  
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.  
M13658  
5
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.  
Fig. 31. W7212 used with M7215 Damper Motor and TB7220 or TB8220 Thermostats.  
63-2484—2  
24  
SOLID STATE ECONOMIZER SYSTEM  
TR  
TR1  
N1  
N
~
+
1
2
3
4
5
MINIMUM POSITION  
ADJUSTMENT  
24  
Vac  
24 Vac  
COM  
P1  
T1  
HOT  
P
T
C7150B MIXED  
AIR OR C7046A  
DISCHARGE  
+
–
F
AIR SENSOR  
1
2
5
AQ1  
–
+
0/2-10 VDC  
INDOOR AIR  
SENSOR  
MS7XXX  
HONEYWELL  
ACTUATOR  
AQ  
SO+  
SO  
SR+  
3
4
EF  
EF1  
SR  
4
W7212  
3
C7400  
620 OHM  
OUTDOOR  
AIR  
+
RESISTOR  
ENTHALPY  
SENSOR  
S
C
L1  
(HOT)  
L2  
COOL 1  
Y1  
Y1  
Y2  
EXHAUST  
FAN  
5
HEAT 2  
W2  
W1  
W2  
UNOCCUPIED  
HEAT 1  
ST6008  
TIMER  
W1  
G
6
FAN  
OCCUPIED  
DELAY  
RELAY  
RH  
FDR  
G
R
FAN  
2
L2  
RC  
X
FDR  
1
L1  
(HOT)  
HVAC EQUIPMENT  
TERMINAL STRIP  
THERMOSTAT  
1
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.  
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE  
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.  
4
5
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.  
M24219  
SEE WIRING DIAGRAMS FOR T7350 AND TB7220/TB8220.  
TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS ON THE THERMOSTAT.  
6
Fig. 32. W7212A used in single-stage cooling system with single enthalpy changeover and Honeywell actuator and time  
clock for occupancy.  
25  
63-2484—2  
SOLID STATE ECONOMIZER SYSTEM  
TR  
TR1  
N1  
N
~
1
MINIMUM POSITION  
ADJUSTMENT  
2
24  
Vac  
24 Vac  
COM  
P1  
T1  
HOT  
3
P
T
+
C7150B MIXED  
AIR OR C7046A  
+
–
4
DISCHARGE  
AIR SENSOR  
F
5
1K  
1S  
1
2
5
3
AQ1  
2K  
–
+
0/2-10 VDC  
INDOOR AIR  
SENSOR  
MS7XXX  
HONEYWELL  
ACTUATOR  
AQ  
SO+  
SO  
SR+  
3
4
1S1  
EF  
EF1  
SR  
W7212  
C7400  
7
5
OUTDOOR  
AIR  
+
620 OHM  
ENTHALPY  
SENSOR  
RESISTOR  
S
C
L1  
(HOT)  
L2  
COOL 1  
COOL 2  
HEAT 2  
HEAT 1  
Y1  
Y2  
Y1  
Y2  
T6031 AMBIENT  
LOCKOUT  
W
R
EXHAUST  
FAN  
CONTROL  
50 F SETPOINT  
W2  
W1  
W2  
UNOCCUPIED  
8
6
W1  
G
ST6008  
TIMER  
FAN  
9
DELAY  
RELAY  
OCCUPIED  
RH  
FDR  
FDR  
G
R
FAN  
2
RC  
X
L2  
4
1
L1  
(HOT)  
HVAC EQUIPMENT  
TERMINAL STRIP  
T7300 OR T874  
THERMOSTAT  
1
2
3
6
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
USE THE FOLLOWING CONTACTS INSTEAD OF TIMER  
FOR T7300, USE A1 AND A2 TERMINALS.  
FOR T7350 USE AUX TERMINAL.  
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA  
LOAD OF THE ECONOMIZER AND ACTUATOR.  
FOR TB7220 OR TB8220 USE A TERMINAL  
THE TERMINALS ARE CONNECTED WHEN THERMOSTAT IS IN THE OCCUPIED MODE.  
7
8
9
1S IS AN ELECTRONIC SWITCH THAT CLOSES WHEN POWERED  
BY A 24 VAC INPUT.  
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.  
SEE WIRING DIAGRAMS FOR T7350 AND TB7220/TB8220.  
4
5
FOR T7300 ONLY  
TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS ON THE THERMOSTAT.  
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE  
REMOVED ONLY WHEN A C7400 ENTHALPY SENSOR IS ADDED TO  
SR AND SR+ FOR DIFFERENTIAL ENTHALPY.  
M24220  
Fig. 33. W7212A used in two-stage cooling system with Honeywell Series 72 Actuator and time clock for occupancy.  
63-2484—2  
26  
SOLID STATE ECONOMIZER SYSTEM  
1
2
L2  
L1  
(HOT)  
~
+
1
2
3
4
5
TR  
TR1  
N1  
N
MINIMUM POSITION  
ADJUSTMENT  
24  
Vac  
24 Vac  
COM  
F
P1  
T1  
HOT  
P
T
MS7XXX  
HONEYWELL  
ACTUATOR  
C7150B MIXED  
AIR OR C7046A  
DISCHARGE  
+
–
AIR SENSOR  
1
2
5
~
1
2
AQ1  
–
+
0/2-10 VDC  
INDOOR AIR  
SENSOR  
3
AQ  
SO+  
SO  
SR+  
+
3
4
4
F
5
EF  
EF1  
MS7XXX  
HONEYWELL  
ACTUATOR  
SR  
W7212  
4
620 OHM  
C7400  
5
UNOCCUPIED  
3
RESISTOR  
OUTDOOR  
+
ST6008  
AIR  
7
TIMER  
ENTHALPY  
SENSOR  
S
L1  
(HOT)  
OCCUPIED  
L2  
1
C
COOL 1  
Y1  
Y2  
Y1  
Y2  
L1  
(HOT)  
COOL 2  
HEAT 2  
HEAT 1  
L2  
1
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
EXHAUST  
FAN  
W2  
W1  
W2  
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE  
THE LOAD OF ALL ACTUATORS.  
W1  
G
USE THE FOLLOWING CONTACTS INSTEAD OF TIMER  
FOR T7300, USE A1 AND A2 TERMINALS.  
FOR T7350 USE AUX TERMINAL.  
FAN  
DELAY  
RELAY  
FOR TB7220 OR TB8220 USE A TERMINAL  
THE TERMINALS ARE CONNECTED WHEN THERMOSTAT  
IS IN THE OCCUPIED MODE.  
RH  
FDR  
FDR  
G
R
FAN  
RC  
X
L2  
L1  
4
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR  
SHOULD BE REMOVED ONLY WHEN A C7400 ENTHALPY  
SENSOR IS ADDED TO SR AND SR+ FOR DIFFERENTIAL  
ENTHALPY.  
1
(HOT)  
THERMOSTAT  
6
HVAC EQUIPMENT  
TERMINAL STRIP  
EF AND EF1 ARE DRY CONTACTS IN THE  
LOGIC MODULE.  
5
6
SEE WIRING DIAGRAMS FOR T7350  
AND TB7220/TB8220.  
M24221  
7
TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS  
ON THE THERMOSTAT.  
Fig. 34. W7212 controlling parallel-wired Honeywell Series 72 Actuators and time clock for occupancy.  
27  
63-2484—2  
SOLID STATE ECONOMIZER SYSTEM  
~
1
2
TR  
TR1  
O
5
3
+
N
4
MINIMUM POSITION  
ADJUSTMENT  
24  
Vac  
24 Vac  
COM  
P1  
T1  
F
5
HOT  
P
T
+
–
C7150B  
DISCHARGE  
AIR SENSOR  
MS7XXX  
1
2
4
HONEYWELL  
ACTUATOR  
AQ1  
–
+
0/2-10 VDC  
INDOOR AIR  
SENSOR  
AQ  
SO+  
SO  
SR+  
3
5
EF  
EF1  
SR  
W7214  
2
3
620 OHM  
C7400  
RESISTOR  
OUTDOOR  
AIR  
+
ENTHALPY  
SENSOR  
S
A3  
A2  
Y1  
Y2  
4
C
COOL 1  
Y1  
Y2  
L1  
(HOT)  
COOL 2  
HEAT 2  
HEAT 1  
FAN  
L2  
EXHAUST  
FAN  
W2  
W2  
W1  
G
W1  
G
RH  
L2  
L1  
1
R
O
RC  
X
(HOT)  
5
O
HVAC EQUIPMENT  
TERMINAL STRIP  
T7300  
THERMOSTAT  
1
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.  
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE REMOVED ONLY WHEN A  
C7400 ENTHALPY SENSOR IS ADDED TO SR AND SR+ FOR DIFFERENTIAL ENTHALPY.  
4
5
T7300 TERMINALS A2 AND A3 ARE CONNECTED WHEN THERMOSTAT IS IN THE UNOCCUPIED MODE.  
SEE WIRING DIAGRAMS FOR T7350 AND TB7220/TB8220.  
W7213: B TERMINAL  
W7214: O TERMINAL  
M24222  
Fig. 35. W7213, W7214 controlling heat pump system.  
63-2484—2  
28  
SOLID STATE ECONOMIZER SYSTEM  
Table 6. Troubleshooting modulating economizer—outdoor enthalpy above setpoint.  
Condition on Logic Module Should Be  
1. Red LED not lighted.  
Condition Not Met  
1. If the LED glows, the Logic Module recognizes conditions are good for free cool-  
ing. Verify that conditions are above the enthalpy setpoint, see Note 2. Check wir-  
ing to Enthalpy Control for a short from {SO} and {+}.  
2. 24 Vac to terminals {TR} and {TR1}.  
3. 24 Vac to terminals {1} and {TR1}.  
4. 24 Vac to terminals {2} and {TR1}.  
2. Check the wiring from [G] and [C] on the unit low voltage terminal strip. {TR} and  
{TR1} power the actuator.  
3. Verify that there is a call for cooling from the thermostat. Without a call for cooling,  
the compressor can not be in the normal air conditioning mode.  
4. If 24 Vac is not on {2} and {TR1}, the internal switch is not set correctly. Remove  
the {SO} wire from the module. If 24 Vac is on {2} and {TR1}, the enthalpy control  
is bad or the {SO} and {+} wires are shorted together. If no voltage to {2} and  
{TR1}, the module is bad.  
5. Continuity on terminals {1} and {2}, {3} 5. If there is not continuity for terminals {1} and {2}, the internal switch is not in the  
and {4}.  
correct position and the module is defective. If there is continuity from terminals  
{1} and {2}, the red LED should not be lighted. If there is continuity on terminals  
{3} and {4}, the internal switch is correctly energized. The damper actuator should  
be in a min. position.  
6. Compressor does not operate with all 6. Check the wiring from {2} to Y1 on the unit low voltage control board. If the LED is  
above conditions correct.  
not lighted, check 24 Vac from {2} to Y1.  
Second Stage  
7. 24 Vac to terminals {3} and {TR1}.  
8. 24 Vac to terminals {4} and {TR1}.  
7. Verify that you have a two-stage thermostat. Check for a call for a second stage  
cooling. If 24 Vac is not on {3} and {TR1}, check wiring from Y2 on the thermostat  
to the module.  
8. If {4} and {TR1} do not have 24 Vac, and {3} and {TR1} have 24 Vac, the internal  
switch is not in the correct position. The module is defective.  
9. Compressor does not operate with  
9. If all other functions are correct, check wiring from {4} to Y2 on the unit low voltage  
second stage conditions met.  
terminal board.  
Table 7. Troubleshooting modulating economizer—outdoor enthalpy below setpoint.  
Condition on Logic Module Should Be  
Conditions Not Met  
1. Red LED lighted.  
1. Jumper terminals {SO} and {+}. If the LED lights, the module is okay, see Note 2.  
Check wiring to enthalpy control.  
2. 24 Vac to terminals {TR} and {TR1}.  
3. 24 Vac to terminals {1} and {TR1}.  
2. Check the wiring from [G] and [C] on the unit low voltage terminal strip. {TR} and  
{TR1} power the actuator.  
3. Verify there is a call for cooling from the thermostat. Without a call for cooling, the  
motor can not be in the economizer mode.  
4. No continuity on terminals {1} and {2}. 4. If there is continuity from terminals {1} and {2}, the red LED should not be lighted. If  
there is continuity and the LED glows, the module is defective.  
5. Continuity on terminals {3} and {5}.  
5. If there is continuity on terminals {3} and {5}, the internal switch is correctly ener-  
gized. Damper motor should be in a modulating mode.  
6. Motor does not operate with all above 6. Jumper the mixed air sensor terminals {T} and {T1}. If the motor begins to operate,  
conditions met.  
check the wiring to the sensor. If correct, the temperature is below the sensor set-  
point or it is defective. If the motor does not operate, and the wiring is correct and  
the temperature is above the sensor setpoint, the motor is bad.  
Second Stage  
7. 24 Vac to terminals {3} and {TR1}.  
7. Verify that you have a two-stage thermostat. Check for a call for a second stage  
cooling. If 24 Vac is not on terminals {3} and {TR1}, check wiring from terminal Y2  
on the thermostat to the module.  
8. 24 Vac to terminals {5} and {TR1}.  
8. If terminals {5} and {TR1} do not have 24 Vac, the internal switch is not in the cor-  
rect position, assuming that terminals {3} and {TR1} have 24 Vac. The module is  
defective.  
9. Compressor does not operate with  
9. If all other functions are correct, check the wiring from terminal {5} to Y2 on the unit  
second stage conditions met.  
low voltage terminal board.  
29  
63-2484—2  
SOLID STATE ECONOMIZER SYSTEM  
Table 8. Troubleshooting three-position economizer—outdoor enthalpy above setpoint.  
Condition on Logic Module Should Be  
1. Red LED not lighted.  
Conditions Not Met  
1. If the LED glows, the module is in the economizer mode. Verify the conditions are  
above the enthalpy setpoint, see Note 2. Check wiring to Enthalpy Control for a  
short from {SO} and {+}.  
2. 24 Vac to terminals {TR} and {TR1},  
2. Check the wiring from [G] and [C] on the unit low voltage terminal strip. {TR} and  
{X} and {TR}.  
{TR1} power the actuator. {X} and {TR} provide power for minimum position.  
3. 24 Vac to terminals {1} and {TR}.  
3. Verify that there is a call for cooling from the thermostat. Without a call for cooling  
the compressor can not be in the normal air conditioning mode.  
4. 24 Vac to terminals {2} and {TR}.  
4. If 24 Vac is not on {2} and {TR}, the internal contacts are not set correctly. Remove  
the {SO} wire from the module. If 24 Vac is on {2} and {TR}, the enthalpy control is  
bad or the {SO} and + wiring are shorted together. If no voltage to {2} and {TR}, the  
module is bad.  
5. Continuity on terminals {1} and {2}, {3} 5. If there is not continuity for {1} to {2}, the internal contacts are not in the correct  
and {4}.  
position, and either the module or the enthalpy control is defective. If there is conti-  
nuity from terminals {1} and {2}, the red LED should not be lighted. If there is conti-  
nuity and the LED glows, the module is defective. If there is continuity on terminals  
{3} and {4}, the internal contacts are correctly energized. Damper motor should be  
in the min. position.  
6. Compressor does not operate with all 6. Check the wiring from {2} to Y1 on the unit low voltage control board. Verify that  
above conditions correct.  
there are not 24 Vac to Y1 and C on the unit.  
Second Stage  
7. 24 Vac to terminals {3} and {TR}.  
8. 24 Vac to terminals {5} and {TR}.  
7. Verify that the thermostat is two-stage. Check for a call for a second stage cooling.  
If there are not 24 Vac on {3} and {TR}, check wiring from Y2 on the thermostat to  
the module.  
8. If {5} and {TR} do not have 24 Vac and {3} and {TR} have 24 Vac, the internal  
switch 1S is not in the correct position. The module is defective.  
9. Compressor does not operate with  
9. If all other functions are correct, check the wiring from {5} to Y2 on the unit low volt-  
second stage conditions met.  
age terminal board.  
Table 9. Troubleshooting three position economizer—outdoor enthalpy below setpoint.  
Condition on Logic Module Should Be  
Conditions Not Met  
1. Red LED lighted.  
1. Jumper terminals {SO} and {+}. If the LED glows, the module is okay, see Note 2.  
Check wiring to enthalpy control.  
2. 24 Vac to terminals {TR} and {TR1}.  
3. 24 Vac to terminals {1} and {TR1}.  
2. Check the wiring from [G] and [C] on the unit low voltage terminal strip. {TR} and  
{TR1} power the actuator.  
3. Verify there is a call for cooling from the thermostat. Without a call for cooling, the  
motor can not be in the economizer mode.  
4. No continuity on terminals {1} and {2}. 4. If there is continuity from terminals {1} and {2}, then the red LED cannot be lighted.  
If there is continuity and the LED glows, the module is defective.  
5. Continuity on terminals {3} and {5}.  
5. If there is continuity on terminals {3} and {5}, the internal switch 1S is correctly  
energized. Damper motor should be in a modulating mode.  
6. Motor does not operate with all above 6. Jumper the mixed air sensor terminals {6} and {D}. If the motor begins to operate,  
conditions met.  
check the wiring to the sensor. If it is correct, the temperature is below the sensor  
setpoint or the sensor is defective. If the motor does not operate, the wiring is cor-  
rect, and the temperature is above the sensor setpoint, the motor is bad.  
Second Stage  
7. 24 Vac to terminals {3} and {TR}.  
7. Verify that the thermostat is two-stage. Check for a call for a second stage cooling.  
If 24 Vac is not on {3} and {TR}, check wiring from Y2 on the thermostat to the  
module.  
8. 24 Vac to terminals {5} and {TR}.  
8. If {5} and {TR} do not have 24 Vac, and {3} and {TR} do have 24 Vac, then the  
internal switch 1S is not in the correct position. The module is defective.  
9. Compressor does not operate with  
9. If all other functions are correct, check the wiring from {5} to Y2 on the unit low volt-  
second stage conditions met.  
age terminal board.  
63-2484—2  
30  
SOLID STATE ECONOMIZER SYSTEM  
CHECKOUT AND TROUBLESHOOTING:  
W7212  
W7212  
EXH  
N1  
Set  
10V  
N
2V  
Checkout requires a 9V battery, 620 ohm, 1.2K ohm, 5.6K  
ohm, and 6.8K ohm resistors. Use Table 10 and Fig. 36 for  
checkout.  
EXH  
P1  
T1  
P
T
Min  
Pos  
Open  
1
DC VOLTMETER  
DCV  
Max  
10V  
+
–
2V  
CAUTION  
AQ1  
DCV  
Equipment Damage Hazard.  
AQ  
SO+  
SO  
SR+  
SR  
DCV  
Set  
10V  
Excessive force can damage potentiometer  
controls.  
Use a small screwdriver when adjusting enthalpy  
changeover and minimum damper position controls.  
2V  
S
C7400  
+
Free  
Cool  
B
C
D
A
2
620 OHM RESISTOR  
1
2
INSERT DC VOLTMETER BETWEEN AQ AND AQ1 FOR  
CHECKOUT AND TROUBLESHOOTING.  
JUMPER USED FOR SINGLE ENTHALPY CONTROL.  
M20612  
Fig. 36. Meter location for checkout and troubleshooting  
(W7212 shown).  
Table 10. Checkout for W7212, W7213, W7214 Economizers Connected to Honeywell Actuator.  
Step  
1.  
Checkout Procedure  
CHECKOUT PREPARATION  
Proper Response  
Disconnect power at TR and TR1.  
Disconnect devices at P and P1.  
Jumper P to P1.  
All LED are off; Exhaust Fan contacts are open.  
Place 5.6K ohm resistor across T and T1.  
Jumper TR to 1.  
W7212 only: Jumper TR to N.  
If connected, remove C7400 Enthalpy Sensor from  
terminals S and +.  
O
Connect 1.2K ohm 4074EJM Checkout Resistor across  
terminals S and +.  
O
Put 620 ohm resistor across S and +.  
R
Set minimum position, DCV setpoint, and Exhaust  
potentiometers fully CCW.  
Turn DCV maximum position potentiometer fully CW.  
Set enthalpy potentiometer to D.  
Apply power (24 Vac) to terminals TR and TR1.  
DIFFERENTIAL ENTHALPY  
2.  
3.  
Execute step one, Checkout Preparation.  
–
–
Place 620 ohm resistor across S and +.  
O
Place 1.2K ohm resistor across S and +.  
Free cool LED turns on.  
Free cool LED turns off.  
R
Remove 620 ohm resistor from S and +.  
O
SINGLE ENTHALPY  
Execute step one, Checkout Preparation.  
Set enthalpy potentiometer to A (fully CCW).  
Set enthalpy potentiometer to D (fully CW).  
–
Free cool LED turns on.  
Free cool LED turns off.  
31  
63-2484—2  
 
SOLID STATE ECONOMIZER SYSTEM  
Table 10. Checkout for W7212, W7213, W7214 Economizers Connected to Honeywell Actuator. (Continued)  
Step  
4.  
Checkout Procedure  
DCV AND EXHAUST  
Proper Response  
Execute step one, Checkout Preparation.  
Ensure terminals AQ and AQ1 are open.  
–
LED for both DCV and Exhaust should be off.  
Actuator drives fully closed.  
Connect 9V battery positive to AQ and negative to AQ1.  
LED for both DCV and Exhaust turn on.  
Actuator drives to between 81 and 85 degrees open.  
Turn Exhaust potentiometer CW until Exhaust LED turns  
off.  
Exhaust LED turns off with potentiometer approximately 90  
percent CW. Actuator remains in position.  
Turn DCV setpoint potentiometer CW.  
DCV LED turns off with potentiometer at approximately 9V.  
Actuator drives fully closed.  
Turn DCV setpoint potentiometer CCW until Exhaust LED Exhaust contacts close 30-90 seconds after Exhaust LED  
turns on.  
turns on.  
Turn DCV setpoint potentiometer CW.  
Exhaust LED turns off with potentiometer indication at  
approximately 9V.  
Turn Exhaust potentiometer CCW until Exhaust LED turns Exhaust contacts close 30-90 seconds after Exhaust LED  
on.  
turns on.  
5.  
MINIMUM AND MAXIMUM POSITION  
Execute step one, Checkout Preparation.  
Connect 9V battery positive to AQ and negative to AQ1.  
–
DCV LED turns on. Actuator drives to between 81 and 85  
degrees open.  
Turn DCV maximum position potentiometer to midpoint.  
Turn DCV maximum position potentiometer to fully CCW.  
Turn minimum position potentiometer to midpoint.  
Turn minimum position potentiometer fully CW.  
W7212: Remove jumper from TR and N.  
MIXED AIR INPUT  
Actuator drives to between 18 and 72 degrees open.  
Actuator drives fully closed.  
Actuator drives to between 18 and 72 degrees open.  
Actuator drives fully open.  
Actuator drives fully closed.  
6.  
7.  
Execute step one, Checkout Preparation.  
Set enthalpy potentiometer to A.  
–
Free cool LED turns on.  
Actuator drives to between 18 and 72 degrees open.  
Remove 5.6K ohm resistor and jumper from T and T1.  
Remove jumper from T and T1 and leave open.  
HEAT PUMP INPUT - W7213, W7214 ONLY  
Execute step one, Checkout Preparation.  
Set enthalpy potentiometer to A.  
Actuator drives fully open.  
Actuator drives fully closed.  
–
Free cool LED turns on.  
Actuator drives to between 18 and 72 degrees open.  
W7213: Jumper TR to B.  
W7214: Remove jumper from TR and O.  
Free cool LED turns off.  
Actuator drives fully closed  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
customer.honeywell.com  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Toronto, Ontario M1V 4Z9  
® U.S. Registered Trademark  
© 2005 Honeywell International Inc.  
63-2484—2 M.S. Rev. 08-06  

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