Honeywell Weather Radio C7650A User Manual

C7650A  
Solid State Temperature Sensor  
PRODUCT DATA  
FEATURES  
Senses temperature of outdoor air.  
Long lasting thermistor sensing element is accurate  
and stable over time.  
When temperature of outdoor air increases, the  
outdoor air damper is closed to a preset minimum  
position.  
When temperature of outdoor air is low, the outdoor  
air damper is opened to reduce the cooling load in the  
building.  
Provides 10 to 20 mA output signal to W7459 Solid  
State Economizer Control; setpoint is located on solid  
state economizer control.  
Sensor is enclosed in a rugged, corrosion-resistant  
glass-fiber reinforced plastic case.  
Compact size and lightweight construction provide  
easy mounting in HVAC rooftop unit.  
GENERAL  
C7650A Solid State Thermistor Sensor is used with the  
W7459 Solid State Economizer Control Package. The W7459  
Solid State Economizer Control Package is usually mounted  
on an M7405/M7415 Actuator. It permits the use of outdoor  
air as the first stage of cooling in heating, ventilating and air  
conditioning (HVAC) systems. The application is for  
differential or single temperature economizer control on  
HVAC equipment up to approximately 20 tons.  
Contents  
General ...............................................................................  
Features ..............................................................................  
Specifications ......................................................................  
Ordering Information ...........................................................  
Installation ...........................................................................  
Operation ............................................................................  
1
1
2
2
2
3
63-2499-1  
Copyright © 1996 Honeywell Inc.  
All Rights Reserved  
 
C7650A SOLID STATE TEMPERATURE SENSOR  
W7459 ECONOMIZER PACKAGE MOUNTED ON ACTUATOR  
TR  
L1  
(HOT)  
TR  
SO  
SR  
24 Vac  
TR1  
TR1  
L2  
B
C
A
D
+
TEMPERATURE  
SETPOINT  
+
+
S
5
C7650A OUTDOOR  
AIR TEMPERATURE  
SENSOR  
620 OHM  
RESISTOR  
1
3
2
4
1
TR  
MINIMUM  
POSITION  
MIXED AIR  
SENSOR  
TR1  
T
P
T1  
P1  
TR  
OPEN  
MINIMUM  
POSITION  
TR1  
W7459 ECONOMIZER PACKAGE  
ACTUATOR  
M7577  
1
SEE W7459 SPECIFICATIONS FOR ADDITIONAL  
WIRING INFORMATION.  
Fig. 2. Wiring Connections for C7650A Temperature Sensor.  
Operation  
CAUTION  
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.  
1. Before beginning installation, disconnect power  
supply to prevent electrical shock or equipment  
damage.  
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.  
2. When selecting the location, make sure the  
sensor is not exposed to rain, snow, or direct  
sunlight.  
Location  
The relationship between the C7650A output current and the  
temperature is shown in Fig. 3.  
The C7650A Temperature Sensor can be mounted in any  
position; however, the sensor must be installed where it is  
exposed to freely circulating air, but protected from rain and  
direct sunlight.  
19  
LED ON  
18  
The C7650A is designed to operate in 500 ft/min minimum  
airflow.  
D
17  
LED ON  
16  
15  
14  
LED OFF  
C
Wiring  
Disconnect power supply before beginning installation to  
prevent electrical shock or equipment damage. All wiring  
must comply with applicable codes and ordinances. Follow  
the wiring information furnished by the equipment  
LED ON  
LED OFF  
B
13  
12  
LED ON  
LED OFF  
A
manufacturer or refer to Fig. 2 for typical wiring hookups.  
11  
10  
9
LED OFF  
95  
85 90  
OPERATION  
100  
40  
60  
DEGREES FAHRENHEIT  
NOTE: A,B,C,D ARE W7459A SWITCHING SETPOINTS.  
65  
45  
50  
55  
70  
75  
80  
M7578A  
Control Dial Setting  
Control setpoint scale is located on the W7459 Solid State  
Economizer Control. Control points A, B, C, D are field  
selectable; use A, B, C, D control points for temperature  
sensing.  
Fig. 3. C7650A Temperature Sensor Output Current.  
63-2499—1  
3
 
Home and Building Control  
Honeywell Inc.  
Honeywell Plaza  
P.O. Box 524  
Minneapolis MN 55408-0524  
Home and Building Control  
Honeywell Limited-Honeywell Limitée  
155 Gordon Baker Road  
North York, Ontario  
Honeywell Asia Pacific Inc.  
Room 3213-3225  
Sun Hung Kai Centre  
No. 30 Harbour Road  
Wanchai  
M2H 2C9  
Hong Kong  
Honeywell Europe S.A.  
3 Avenue du Bourget  
Honeywell Latin American Division  
Miami Lakes Headquarters  
B-1140 Brussels Belgium  
14505 Commerce Way Suite 500  
Miami Lakes FL 33016  
Helping You Control Your World®  
63-2499—1 G.H. Rev. 12-96 Printed in U.S.A.  
 

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