42
Rev. 2
PRODUCT DESIGN
THERMOSTAT WIRING
Thermostat Wiring - Single Stage Furnace
The single stage furnace will have a "W1" terminal and will
use a single stage thermostat. The following drawing illus-
trates the typical field wiring for a heat only single stage
system and a single stage heating/single stage cooling sys-
tem.
W1
R
G
Y
W1
R
C
Y
R
B
Y
R
B
G
W1
Y
C
Furnace Control
Furnace Control
Remote
Condensing
Unit
Heating
Room
Thermostat
Heating/Cooling
Room
Thermostat
G
W1
Typical Field Wiring for Single Stage Gas Furnace
(24 VAC Control Circuit)
Thermostat Wiring - GUIS/GCIS Two Stage Furnace
A two stage furnace will have both “W1” and “W2” terminals
and must use a two stage thermostat. The following drawing
illustrates the typical field wiring for a heat only two stage
system and a two stage heating/one stage cooling system.
If the thermostat has “Y1” and “Y2” connections and a one
stage cooling system is used, connect “Y” on the furnace
control to “Y1” on the thermostat.
W2
W1
R
G
Y
W2
W1
R
C
Y
R
B
Y
R
B
G
W1
W2
Y
C
Furnace Control
Furnace Control
Remote
Condensing
Unit
Heating
Room
Thermostat
Heating/Cooling
Room
Thermostat
G
W1
W2
Typical Field Wiring for Two Stage Furnace
(24 VAC Control Circuit)
Thermostat Wiring - GUIV Variable Speed, Two Stage
Furnace
A variable speed, two stage furnace will have both “W1” and
“W2” terminals. Figures A, B, and C show connections for
a “heat only” two-stage system and a two-stage “heating”/
one stage “cooling” system. If the thermostat has “Y1” and
“Y2” connections and a one stage cooling system is used,
connect “Y” on the furnace control to “Y1” on the thermo-
stat.
Y/Y2
Y1
G
R1
DE
Y
R
C
Y
R
C
G
W1
W2
Y
C
Furnace
Control
Furnace
Control
Remote
Condensing
Unit
Heating
Room Thermostat
Heating/Cooling
Room Thermostat
G
W1
W2
G
W1
C
W2
Y
R
R
W2
W1
Y
R
C
G
W1
W2
Y
C
Furnace
Control
Remote
Cond
Unit
Heating/Cooling Room Thermostat
G
W1
C
W2
Y
R
ACB
Interface
Board
Figure A
Figure B
Figure C
Typical Field Wiring for Variable Speed,
Two Stage Furnace
(24VAC Control Circuit)
A 40 V.A. transformer and an integrated electronic control
are built into the furnace to allow use with most cooling equip-
ment.
Dehumidistat Wiring
The dehumidistat is an optional device that energizes a lower
blower speed whenever the cooling system is activated and
there is a call for dehumidification. The dehumidistat used
must operate on 24 VAC and contains a switch that opens
on a humidity rise.
Содержание GCIA045A30
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