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Honeywell T812A1010 - Premier 1 Heat Stage Thermostat Installation Instructions Manual page 3

Installation instructions
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T812A
THERMOSTAT
R
W
TH
TR
TH
TR
TRANSFORMER
GAS VALVE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 4. T812A in typical gas heating system.
TS812
THERMOSTAT
R
W
LIMIT
CONTROL
PP
TH1
TH2
Fig. 5. Typical hookup to TS812A in millivolt system.
T812B
THERMOSTAT
W
R
GAS VALVE
POWER SUPPLY. PROVIDE DISCONNECT
1
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
Fig. 6. T812B in 12 Vdc application.
COMBINATION FAN
AND LIMIT CONTROL
LIMIT
FAN
L1
(HOT)
1
L2
FAN
MOTOR
M20437
PILOT CONTROL
(IF USED)
MILLIVOLT
GENERATOR
PP
M20438A
1
TO 12 Vdc
POWER SUPPLY
M20439
1
L1
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 7. T812C in heating and cooling system.
L1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
1
AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 8. T812D in cooling only application.
3
T812, TS812 THERMOSTATS
T812C
THERMOSTAT
R W Y G
HEAT
FAN
COOL
M20440
T812D
THERMOSTAT
R
Y
COOL
1
M20441
69-1606ESF-3

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