Important Notice - Lux Products PSPU721T Instruction Manual

IMPORTANT NOTICE

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WHEN USING THIS THERMOSTAT WITH A GAS FURNACE A COMMON WIRE (C) MUST BE
CONNECTED.
When working without a common wire:
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A confirm in HEAT MODE the cooling does not switch on or B confirm in COOL MODE the heat
does not switch on.
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If test A or B fail or the thermostat shuts down in either HEAT or COOL MODE then it is neces-
sary to connect a common wire, (C), alternatively it may be possible to solve this issue by sim-
ply connecting the 250 ohm 10 watt resistor between C and W (in the case of a cooling problem
- see B) or between C and Y1 (in the case of a heating problem - see A) at the HVAC equipment.
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When working without a common wire, A confirm that when there is a call for heat, cooling
does not also activate, and when there is a call for cool, heating does not also activate.
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If using the configuration of Heat Pump and Furnace with no Common Wire confirm that when
Heat Pump and Furnace are working together (both stages are operating at the same time) that
the display does not go blank, if so you must use a Common Wire.
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This thermostat is equipped to run with two separated power transformers if required RC and
RH. Terminals RC and RH are internally connected together however you should wish to use two
transformers simply cut with a blade the copper trace on the printed circuit board located
between the C and Y2 screw terminals.
40 LUXPRO ® PSPU721T