Heat Pump - EWC Controls EWT-3102 User Manual

HEAT PUMP

OUTDOOR/INDOOR
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED
2. FACTORY INSTALLED JUMPER.
3．OUTDOOR SENSOR REQUIRED IN SYSTEM WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL KIT
4．OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE
5．MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS EQUIPMENT MONITOR, CAN ALSO BE USED
AS A 24 VAC OUTPUT. SEE HEAT PUMP SECTION ON PAGE 90
6．"O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
Fig. 21. Typical hookup of multistage heat pump with auxiliary/backup heat
EWT-3102 / EWT-3103 Touchscreen Programmable Thermostat
S1 S2 C R RC W W2
S1 S2 C R RC E
O/B AUX
6
2
CHANGEOVER
EMERGENCY
4
3
HEAT RELAY
TEMPERATURE
SENSOR
EQUIPMENT MONITOR
OPTIONAL
24VAC
COMMON
CONNECTION
R
C 1
(3H/2C heat pump).
Y2 Y G
L Y2 Y G
5
VALVE
HEAT 2 RELAY
(AUXILIARY HEAT)
COMPRESSOR 2
COMPRESSOR 1
FAN RELAY
34