Wiring Diagrams - Honeywell Home T4 Pro Series Manual
Programmable thermostat
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Also See for T4 Pro Series:
- User manual ,
- Installation instructions manual (37 pages) ,
- Product information (4 pages)
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Available languages
Wiring diagrams
1 Stage Heat Only: Gas or Oil Furnace
S
L/A
S
O/B
Y
AUX
Y2
E
G
C
U
U
1
2
G
C
W
1
COMMON OPTIONAL.
2
G USED FOR INDEPENDENT FAN CONTROL ONLY. MOST HEAT
ONLY, GAS OR OIL FORCED AIR SYSTEMS DO NOT USE A FAN
(G) WIRE.
1H/1C: Gas Furnace +
Air-Conditioning
S
L/A
S
O/B
Y
AUX
Y2
E
G
C
U
U
1 1
G
C
W
C
G
Y
W
COMMON OPTIONAL.
1
COMPATIBLE MODELS:
TH4110U2005
A
TH4210U2002
W2
W
K
R
Rc
R/Rc
SWITCH UP
FURNACE
R
M38990
COMPATIBLE MODELS:
TH4110U2005
A
TH4210U2002
W2
W
K
R
Rc
R/Rc
SWITCH UP
R
FURNACE
R
M38992
1 Stage Cool Only
S
L/A
S
O/B
Y
AUX
Y2
G
C
U
U
1
C
G
Y
1
COMMON OPTIONAL.
2 Transformer System, 1H/1C: Oil
Furnace + Air-Conditioning
S
L/A
S
O/B
Y
AUX
Y2
G
C
U
U
1
C
G
Y
R
AIR HANDLER
1
COMMON OPTIONAL.
4
COMPATIBLE MODELS:
TH4110U2005
A
TH4210U2002
W2
E
W
K
R
Rc
R/Rc
SWITCH UP
AIR-HANDLER
R
M38991
COMPATIBLE MODELS:
TH4110U2005
A
TH4210U2002
W2
E
W
K
R
Rc
R/Rc SWITCH
DOWN
W
R
OIL FURNACE
M38993
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Questions and answers
How to turn system on
The Honeywell Home T4 Pro Series thermostat system turns on automatically when properly wired and powered. Ensure the thermostat is installed correctly and connected to power. If the system does not turn on, check the wiring, power source, and ensure the C-wire (common wire) is connected if required. If the system is in a delay mode, wait for the built-in compressor protection time to elapse before it starts operating.
This answer is automatically generated