Wiring Diagrams; Cool Only - Aprilaire 8353 User Manual

Wiring Diagrams

The following is just a sample of the most common types of HVAC sys-
tems. Refer to your systems installation manual for wiring information.
HEAT/COOL
SINGLE TRANSFORMER
Transformer
Hot
24 VAC
120 VAC
HEAT ONLY
SINGLE TRANSFORMER
Transformer
Hot
24 VAC
120 VAC
HEAT/COOL
TWO TRANSFORMER
(HEATING)
Transformer
Hot
120 VAC 24 VAC
Hot
120 VAC 24 VAC
(COOLING)
Transformer
4-WIRE
Factory-Installed
jumper
RH
RC
Heating
W
Control
Cooling
Y
Control
Fan
G
Control
2-WIRE
NOTE: Remove factory
installed jumper
RH
RC
Heating
W
Control
Y
G
5-WIRE
RH
RC
Heating
W
Control
Cooling
Y
Control
Fan
G
Control
T
H
Transformer
E
R
120 VAC
M
O
S
T
A
T
T
H
E
R
120 VAC
M
O
S
T
A
T
NOTE: Cut center of
factory installed jumper
and bend back
T
H
NOTE: Both transformers
E
must be in phase.
R
M
O
S
T
A
T
11
HEAT ONLY
3-WIRE
SINGLE TRANSFORMER
Factory- Installed
Hot
24 VAC
Heating
Control

COOL ONLY

3-WIRE
SINGLE TRANSFORMER
NOTE: Remove factory
installed jumper
Transformer
Hot
24 VAC
Control
jumper
T
RH
H
E
RC
R
M
W
Control
O
S
Y
T
A
Fan
G
T
T
RH
H
E
RC
R
M
W
O
S
Cooling
Y
Control
T
A
Fan
G
T