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T7047C,G ELECTRONIC THERMOSTATS AND REMOTE SPACE SENSORS
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9
customer.honeywell.com
® U.S. Registered Trademark
© 2005 Honeywell International Inc.
62-3050—3 B.B. Rev. 02-05
OPERATION AND CHECKOUT
Operation
The T7047C,G Electronic Thermostat or Remote Space
Sensor control element is a negative temperature
coefficient (NTC) thermistor. As the room temperature
increases, the resistance of the thermistor decreases.
The change in the thermistor resistance causes the
motor, system logic panel or system transmitter bridge
circuit to become unbalanced. As the electronic motor,
system logic panel or system transmitter circuits react to
rebalance the circuit, damper or valve movement, or
sequential staging of heating and/or cooling equipment
occurs.
Calibration
The T7047C,G Electronic Thermostat or Remote Space
Sensor is accurately calibrated at the factory. It cannot be
field calibrated.
Checkout
Allow the T7047C,G Electronic Thermostat or Remote
Space Sensor to stabilize to ambient conditions before
taking a resistance measurement. Measure nominal
resistance according to the values described in the
Specifications section. Measure the T7047 resistance in
accordance with the temperature curves. See Fig. 8 and
9.
Check operation of the complete control systems as
directed in the associated technical publications.
Fig. 8. T7047C Remote Sensor resistance
change with change in temperature.
Fig. 9. T7047G Remote Sensor resistance
change with change in temperature.
2000
1800
1600
1400
1200
1000
10
20
30 40
50
60
70 80 90
100
RESISTANCE
(OHMS)
1420 OHMS AT
75 F (24 C)
TEMPERATURE (DEGREES)
M4034
-10
0 10
20 30 40
C
F
1000
900
800
700
600
500
10
20
30 40
50
60
70 80 90
100
RESISTANCE
(OHMS)
710 OHMS AT
75 F (24 C)
TEMPERATURE (DEGREES)
M5354
-10
0 10
20 30 40
C
F
110