Operation and checkout, Operation, Low range thermostat – Honeywell T7047C User Manual

Page 7: Calibration, Checkout

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T7047C,G,H REMOTE SPACE SENSORS

OPERATION AND CHECKOUT

Operation

The T7047C,G Remote Sensor control element is a
negative temperature coefficient (NTC) thermistor. As

the room temperature increases, the resistance of the
thermistor decreases.

The T7047H Remote Sensor control element is a

positive temperature coefficient (PTC) thermistor. As
the room temperature increases, the resistance of the

thermistor increases.

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.

Low Range Thermostat

Use caution when setting temperatures below 40°F
(5°C). A low temperature setpoint can result in

temperatures below freezing in areas distant from the
remote sensor.

Calibration

The T7047 Remote Space Sensor is accurately

calibrated at the factory. It cannot be field calibrated.

Checkout

Allow the T7047 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 sensor resistance in accordance with the
temperature curves. See Fig. 3 through 7.

Check operation of the complete control systems as

directed in the associated technical publications.

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This manual is related to the following products:

H, G