Manual 2100-374
Page 12
THERMOSTAT INDICATOR LAMPS
The red lamp marked “Check” will come on if there is
any problem that prevents the compressor from running
when it is supposed to be.
COMPRESSOR MALFUNCTION LIGHT
Actuation of the red lamp is accomplished by a relay
output from the heat pump control board which is
factory installed. Any condition such as high head
pressure, etc., that will prevent compressor from
operating will cause red lamp to activate. This is a
signal to the operator of the equipment to place system
in emergency heat position.
WIRING – LOW VOLTAGE WIRING
230 / 208V, 1 phase and 3 phase equipment dual
primary voltage transformers. All equipment leaves the
factory wired on 240V tap. For 208V operation,
reconnect from 240V to 208V tap. The acceptable
operating voltage range for the 240 and 208V taps are:
TAP
RANGE
240
253 - 216
208
220 - 187
NOTE: The voltage should be measured at the field
power connection point in the unit and while the
unit is operating at full load (maximum
amperage operating condition).
Nine (9) wires should be run from thermostat subbase
to the 24V terminal board in the unit. A nine
conductor, 18 gauge copper, color-coded thermostat
cable is recommended.. The connection points are
shown in Figures 7 and 8.
TABLE 3
THERMOSTAT WIRE SIZE
r
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m
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f
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T
A
V
A
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6
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1
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2
1
5
4
0
6
0
0
1
0
6
1
0
5
2
TABLE 4
WALL THERMOSTAT AND SUBBASE
COMBINATIONS
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2
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8
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LOW VOLTAGE CONNECTIONS
These units use a grounded 24 volt AC low voltage
circuit.
The "R" terminal is the hot terminal and the "C"
terminal is grounded.
"G" terminal is the fan input.
"Y" terminal is the compressor input for cooling.
"B" terminal is the reversing valve input. The reversing
valve must be energized for heating mode.
"R" terminal is 24 VAC hot.
"C" terminal is 24 VAC grounded.
"L" terminal is compressor lockout output. This
terminal is activated on a high or low pressure trip by
the electronic heat pump control. This is a 24 VAC
output.
"W2" terminal is second stage heat (if equipped).
"O1" terminal is the ventilation input. This terminal
energizes any factory installed ventilation option.
"E" terminal is the emergency heat input. This terminal
energizes the emergency heat relay.
"W3" terminal is the 24 VAC dehumidification circuit.
"W1" terminal is the compressor input of heat pump
heating.
NOTE: For total and proper control using DDC, a total
of 8 controlled outputs are required (7 if no
ventilation system is installed). For proper
system operation under Emergency Heat
conditions where the compressor needs to be
deactivated, the B-W2-E outputs need to be
energized. Removing the W1 (compressor)
signal alone turns the compressor off, but does
not activate the additional circuitry embedded in
the heat pump for proper and complete
operation.
LOW VOLTAGE CONNECTIONS
FOR DDC CONTROL
Fan Only
Energize G
Cooling Mode
Energize Y, G
Heat Pump Heating
Energize W1, G, B
2nd Stage Heating
Energize G, W2, W1, B
(if employed)
Ventilation
Energize G, O1
Dehumidification
Energize W3
Emergency Heat
Energize B, W2, E, G
