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Fig. 4—T8631A 1-stage oil heat/1-stage cool. Oil Primary has its own transformer.
COOLING
DAMPER/
COOLING
CHANGE-
OVER
1
L1
(HOT)
L2
1
Fig. 5—T8631R 2-stage heat/1-stage cool thermostat with EM. HT.-HEAT-OFF-COOL system and ON-AUTO
fan switching.
3
POWER
SUPPLY
SUBBASE
STAT
LOGIC/
LOGIC
CONTROL
CIRCUIT
CIRCUIT
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS
REQUIRED.
2
REMOVE JUMPER ( IF PRESENT) FOR SYSTEM WITH ISOLATED STAGE 1 HEATING
AND COOLING CONNECTIONS.
3
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
DO NOT CONNECT H BUS WIRES TO THERMOSTAT UNTIL OTHER TotalHome
4
DEVICES ARE CONNECTED.
O
W
RELAY
1
L1
(HOT)
T
T
L2
OIL PRIMARY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
ON
FAN
SWITCH
AUTO
SYSTEM
SWITCH
HIGH
LIMIT
HEATING-COOLING WALLPLATE
G
C
FAN
RELAY
AUX.
E. HEAT
HEAT
RED
GREEN
HIGH
LIMIT
E. HEAT
HEAT
OFF
COOL
HEAT/
COOL 1
3
R
B
Y
HEATING
AIR
DAMPER/
COND.
HEATING
EQUIP.
CHANGE-
OVER
TRANSFORMER
R
C
L
MONITOR
W2
AUXILIARY
HEAT RELAY
E
EMERGENCY
HEAT 2
HEAT RELAY
W1
STAGE 1
HEAT RELAY
G
FAN RELAY
2
O
CHANGEOVER
RELAY (COOL)
B
CHANGEOVER
RELAY (HEAT)
Y1
COMPRESSOR
CONTACTOR
H3
TRANS-
H3
CEIVER
H4
BUS OUT
H4
H1
POWER
13.7 VDC
SUPPLY
H2
M3089
L1
(HOT)
L2
1
BUS IN
4
+
BUS
POWER
SUPPLY
_
M3065A
69-0689—2
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