Bryant TSTATBBP250-LA Ix. Remote Temperature Sensor, X. Keypad Lock, Troubleshooting

IX. REMOTE TEMPERATURE SENSOR

A remote temperature sensor is available to read the tem- perature from a space. If a remote temperature sensor is connected, the thermostat will ignore the reading of its in- ternal sensor. When the thermostat is using a reading from a remote sensor, the degree symbol above the tempera- ture reading will blink.

X. KEYPAD LOCK

To prevent unauthorized use of the thermostat, the front panel buttons can be disabled. To disable or lock the

keypad, press and hold the Mode button. While holding down the Mode button, press the UP and DOWN ARROW buttons simultaneously. The ``Locked'' icon will appear on the display.

The thermostat is unlocked by performing the same pro- cedure. Press and hold the Mode button. While holding down the Mode button, press the UP and DOWN ARROW but- tons simultaneously. The ``Locked'' icon will be removed from the display.

TROUBLESHOOTING

For thermostat troubleshooting see Table 4 below.

Table 4 Ð Thermostat Troubleshooting

PROBLEM	SOLUTION
Display on thermostat not illuminated.	Check for 24 vac at the R terminal connection. Terminal R must be
	connected for proper thermostat operation.
``Service Filter'' is displayed on thermostat.	After the con®gured number of blower operating hours, the Service
	Filter message will be displayed. This reminds the owner to re-
	place the ®lter. Reset the Service Filter feature to reset the blower
	operation timer to 0 hours.
Cooling will not energize.	Select COOL mode. Decrease cooling set point to 10 degrees be-
	low room temperature. Check for 24 vac at Y1 terminal. If present,
	thermostat is operating correctly and problem is with wiring or equip-
	ment. If 24 vac is not present, replace the thermostat. Check for
	Compressor Cycle per Hour Limit. Cooling may be locked out.
Heating will not energize.	Select HEAT mode. Increase heating set point to 10 degrees above
	room temperature. Check for 24 vac at W1/O/B terminal. If present,
	thermostat is operating correctly and problem is with wiring or equip-
	ment. If 24 vac is not present, replace the thermostat.
When using 4 wires (R,G,W,Y), the cooling equip-	There is not enough power available. Connect a 270 ohm, 10 watt
ment tries repeatedly to turn on, but cannot. At	power resistor at the air-conditioning equipment between terminals
times the display dims or disappears.	W and C (non-heat pump applications only).
When using 4 wires (R,G,W,Y), the heating equip-	There is not enough power available. Connect a 270 ohm, 10 watt
ment tries repeatedly to turn on, but cannot. At	power resistor at the air-conditioning equipment between terminals
times the display dims or disappears.	Y and C (non-heat pump applications only).
When controlling a heat pump, heat comes on	Con®gure thermostat for heat pump operation (Table 2, Step 3).
during cooling cycle.
When calling for cooling, both heating and cool-	The thermostat is con®gured for a heat pump. Con®gure the ther-
ing are energized.	mostat for non-heat pump operation (Table 2, Step 3).
When controlling a commercial heat pump unit,	Commercial heat pumps require that Heat Pump Option on ther-
unit runs in reverse or heating is always on.	mostat is turned OFF.

Copyright 1998 Bryant Heating & Cooling Systems Printed in U.S.A. CATALOG NO. 809-684