Heat Pump - EWC Controls EWT-3102 User Manual

HEAT PUMP

OUTDOOR/INDOOR
TEMPERATURE
SENSOR
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. 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 LED" SECTION FOR MORE INFORMATION.
4. "O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
5. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 19. Typical hookup of multistage heat pump with no 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
4
2
COMPRESSOR 2
CHANGEOVER
VALVE
5
OPTIONAL
24VAC
COMMON
R C 1
CONNECTION
(2H/2C heat pump).
Y2 Y G
L Y2 Y G
3
COMPRESSOR 1
FAN RELAY
32