T7147 REMOTE SENSOR AND OVERRIDE MODULE
OPERATION
CHECKOUT
1.
Allow the sensor to stabilize to ambient conditions
before taking a resistance measurement. The sensor
resistance measurement should be in accordance with
the device temperature curve (see Fig. 2).
Sensor
The remote sensor control element is a negative temperature
coefficient (NTC) thermistor. As room temperature increases,
the resistance of the thermistor decreases. As room
temperature decreases, the resistance of the thermistor
increases. The T7300 detects the thermistor resistance
change and controls the space temperature by sequentially
staging the heating/cooling equipment on and off.
2.
3 Hour Occupied
Check operation of the
key:
3 Hour Occupied
a. Press the
key once.
b. The LED above the key turns on.
Go to the T7300 thermostat and check it to see that the
3.
4.
3 Hr Occupied
display arrow indicator points to
Warmer Cooler
keys:
.
On models with
and
key once.
Warmer
Warmer
NOTE: The T7047C1025 uses the same sensor element.
a. Press the
b. The LED above the
key comes on.
key turns off and the
key once.
Cooler
c. Press the
d. The LED above the
Cooler
key turns on.
key.
3 Hour Occupied
When correctly wired, pressing the
Warmer
LED above the
3 Hour Occupied
e. Press the
3 Hour Occupied
key
sends a signal from the T7147 to the T7300/Q7300. Upon
receipt of this signal, the T7300/Q7300 proceeds into the
3 Hour Occupied override. In response, the T7300/Q7300
sends a signal back to the T7147 to turn on the 3 Hour
Occupied LED. The 3 Hour Occupied LED remains on for
the duration of the 3 hour override.
f. The LED above this key turns off, as well as those
Warmer Cooler
above either the
or
keys.
5.
Go to the T7300 thermostat and check to see that the
3 Hr
arrow indicator on the display no longer points to
Occupied
and has returned to its currently programmed
occupied or unoccupied period.
NOTE: For additional details, consult the T7300/Q7300
Specification sheet, form 63-4038.
NOTE: If the T7147 does not check out, review the
wiring and connections between the Q7300
and the T7147. Replace the T7147 if wiring
continuity checks out. If the new T7147 does
not check out, replace the Q7300.
3 Hour Setpoint Adjust
3 Hour Occupied
When wired correctly, pressing the
key,
Warmer Cooler
followed by the
or
key sends a signal from the
6.
T7147 to the T7300/Q7300. The T7300/Q7300, upon receipt
of this signal, proceeds into the 3 Hour Setpoint Adjust
override. In response, the T7300/Q7300 sends a signal back
to the T7147 that turns on the 3 Hour Occupied LED and the
appropriate Warmer or Cooler LED. The 3 Hour Occupied
LED and Warmer or Cooler LED remains on for the duration
of the 3 hour override.
Check operation of the complete control system as
directed in the T7300/Q7300 Specification sheet, form
63-4038.
This override may be performed at any time, regardless of
whether the thermostat system is operating in the occupied
or unoccupied mode.
NOTES:
—
For additional details, consult the T7300/Q7300
Specification sheet, form 63-4038.
—
Premature exit from either override can be
3 Hour Occupied
achieved by pressing the
key
again. The T7300 then returns to normal operation.
63-4065—1
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