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EWT-3102 / EWT-3103 Touchscreen Programmable Thermostat
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. 20. Typical hookup of single-stage heat pump with auxiliary/backup heat
(2H/1C heat pump).
33
3
4
HEAT PUMP
S1 S2 C R RC W W2 Y2 Y G
S1 S2 C R RC E L Y2 Y G
O/B AUX
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
2
R
C 1
CHANGEOVER
VALVE
FAN RELAY
OPTIONAL
24VAC
COMMON
CONNECTION
6
5
COMPRESSOR
RELAY
EMERGENCY
HEAT RELAY
HEAT 2 RELAY
(AUXILIARY HEAT)
EQUIPMENT
MONITOR