Comfort Stat CDT901 - Manual (Page 33)

CDT900 Series Touchscreen Programmable Thermostata
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
(2H/2C heat pump).
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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
5
COMPRESSOR 2
COMPRESSOR 1
4
3