Installation Manual

26 Hydronic Air Handler Installaon and Operaon Manual
1. Mount the thermostat approximately 5 ft.
(1.5 m) from the floor and close to, or in, a
frequently used room, preferably on an
inside partitioning wall or a section of wall
without pipes or duct work.
2. Connect the thermostat to the air handler.
Follow the wiring diagrams in the next
section: “5.4.1 Thermostat Wiring
Diagrams.”
Heat Pump Application with Hot Water Heat
3-Speed PSC Motor
Maximum allowable current draw from power-
stealing thermostats or other accessories is 18
mA. Exceeding this value may cause the air
handler control board to operate abnormally.
Hot Water Heat Only Application
Cooling Application with Hot Water Heat
R R
G
W
G
W
RED
Thermostat Air Handler
GRN
WHT
NOTE: Connect common (C) wire only if required. See
thermostat installation instructions for more information.
Refer to section “4.6 Thermostat Requirements”
for complete thermostat installation
requirements.
For thermostat wiring with the Domestic Priority
Switch, refer to section “5.6.6 Air Handler and
Thermostat Wiring.”
NOTE
Thermostat
Air Handler
Y2
Y1
O
W
C
R
W
C
G
R
YEL/
BLU
YEL
ORG
WHT
BLU
GRN
RED
Y2
Y1
O
W
C
G
R
Condensing
Unit
R
R
G
W
G
W1
C
C
Y1
Y1
Y2
Y2
RED
GRN
WHT
YEL
YEL/
BLU
BLU
Thermostat
Air Handler
Condensing
Unit