Installation guide

Observer Communicating Wall Control Four-Wire Connection Wiring Diagrams
Figure 10 (See Thermostat Installation Instructions for specific unit combinations)
Wall Control Outdoor
Green
Yellow
White
Red
Optional Remote {
Room Sensor Humidifier
Connection
Variable Speed
Furnace/Fan Coil
Green _/_
Yellow j_
_ _ WhLte ....
Red __
A
W
HUM
'IF
COM
EX
LEGEND
24V FACTORY WIRING
..... 24V FIELD WIRING
FIELD SPLICE CONNECTION
Non-Communicating Standard Thermostat 3-Wire 24V Circuit Connections
Figure 11 (See Thermostat Installation Instructions for
Specific Unit combinations)
A/C
THERMOSTAT
24 VAC HOT E_]--
24 VAC COM E_"
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN E_"
Typical
FURNACE
.... -[_ ....
...... E_
..... E_ ....
AIR A/C Typical
CONDITIONER THERMOSTAT FANCOIL
24VACHOTD ......
24 VAC COM
HEAT STAGE 1
COOL STAGE 1
INDOORFANEB......
AIR
CONDITIONER
'--Q-E_
LEGEND
-- 24-V FACTORYWIRING
__ __ 24-V FIELD WIRING
FIELD SPLICE CONNECTION
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in
equipment damage or improper operation.
A minimum of three wire thermostat wiring is
required for the system to operate.
421 01 5104 03 Specifications subject to change without notice. 11