Thermostat Wiring - Single Stage Furnace; Thermostat Wiring - Guis/Gcis Two Stage Furnace; Thermostat Wiring - Guiv Variable Speed, Two Stage Furnace; Heating/Cooling Room Thermostat - Amana GUIA070A30 Service Instructions Manual

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.
Heating/Cooling
Heating
Room
Thermostat
W1
R
Y
R
B
G
W1
Furnace Control
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.
Heating/Cooling
Heating
Room
Thermostat
W2
W1
R
Y
R
B
G
W1
W2
Furnace Control
Typical Field Wiring for Two Stage Furnace
(24 VAC Control Circuit)
42
Rev. 2
PRODUCT DESIGN
Room
Thermostat
Y
W1
R
G
C
Y Y
R
B C
G
Remote
W1
Condensing
Unit
Furnace Control
Room
Thermostat
W2
Y
W1
R
G
C
Y Y
R
B C
G
Remote
W1
Condensing
W2
Unit
Furnace Control
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.
Heating
Room Thermostat
W2
W1
R
Furnace
Control
Y
R
C
G
W1
W2
Figure A

Heating/Cooling Room Thermostat

W2
Y
W1
G R
C
Y/Y2
Y
Y1
R
G
C
R1
G
DE
W1
W2
ACB
Furnace Interface
Control Board
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.
Heating/Cooling
Room Thermostat
W2
Y
W1
G R
C
Y
Y
R
C C
G
Remote
W1
Condensing
W2
Unit
Furnace
Control
Figure B
Y
C
Remote
Cond
Unit