Fig. 4. Terminal Designations for Compressor.
Fig. 5. Terminal Designations for Boiler.
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THE “D” TERMINAL OPERATES AS AN INPUT FOR DEFROST. ACTIVE
INPUT ON “D” TERMINAL AT ERM WILL TELL THE THERMOSTAT TO
POWER THE AUX (OR AUX 1) TERMINAL AT THE SUBBASE OR EIM. IF
“D” TO AUX IS NOT DESIRED, DO NOT CONNECT “D” TERMINAL TO THE
ERM5220R IS CONFIGURED FOR USE WITH A COMPRESSOR.
TERMINAL DESIGNATIONS FOR COMPRESSOR
TERMINALS FOR 10K OHM TEMPERATURE SENSOR. CAN BE USED
TO SENSE OUTDOOR TEMPERATURE WHICH WILL BE DISPLAYED
ON A COMPATIBLE RedLINK THERMOSTAT.
COMPRESSOR LINE FAULT TERMINAL. FAULT OCCURRENCE WILL
BE COMMUNICATED TO COMPATIBLE RedLINK THERMOSTAT.
COMPRESSOR DEFROST TERMINAL. DEFROST OCCURRENCE WILL
BE COMMUNICATED TO COMPATIBLE RedLINK THERMOSTAT.
THERMOSTAT WILL ENGERGIZE AUX OR AUX1 WHEN THIS OCCURS.
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M36110
O/B TERMINAL FOR REVERSING VALVE ON HEATPUMP.
SECOND STAGE OF TWO STAGE COMPRESSOR.
FIRST STAGE OF COMPRESSOR.
TERMINALS FOR 24VAC POWER.
TERMINAL FOR JUMPER. JUMPER BETWEEN J AND R SHOULD
BE IN PLACE FOR COMPRESSOR USE.
J
R
C
Y
D
L
S1
S1
O/B
T
Y2
T
J
R
C
Y
O/B
T
D
L
S1
S1
TERMINALS FOR 10K OHM TEMPERATURE SENSOR. CAN BE USED
FOR FREEZE PROTECTION IN THE CASE OF THE THERMOSTAT
LOSING THE SIGNAL TO THE ERM. SENSOR MUST REMAIN INDOORS
TO BE USED FOR FREEZE PROTECTION.
DRY CONTACT TERMINAL FOR HEAT CALL.
TERMINALS FOR 24VAC POWER.
TERMINAL FOR JUMPER. JUMPER BETWEEN J AND R SHOULD
BE REMOVED FOR BOILER USE.
TERMINAL DESIGNATIONS FOR BOILER
Y2
T
DRY CONTACT TERMINAL FOR HEAT CALL.
ERM WILL NOT SUPPORT SERIES 20 OPERATION UNLESS A RELAY IS ADDED
(SEE FIGURE 14). WHEN CONFIGURED TO A BOILER, THE Y RELAY SHALL BE
DE-ENERGIZED AT ALL TIMES.
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M36111
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