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MOUNTING SUBBASE
The subbase does not require leveling for proper opera-
tion, but only for appearance.
Remove thermostat from subbase. See Fig. 1.
The subbase mounts directly onto the wall with the
screws and anchors included in the package. Use the
subbase as a template, and with a pencil, mark the two
mounting screw positions. See Fig. 2. If drywall construc-
tion, plastic anchors must be used; select 3/16 in. bit to
drill holes for anchors. Gently tap anchors into holes until
they are flush with the wall surface. Thread wires through
the center opening of the subbase. Then, mount the subbase
by using two screws provided. Gently tighten screws, level
top surface of subbase and then securely tighten screws.
WIRING
All wiring must comply with local electrical codes and
ordinances.
Fig. 1—Removing thermostat from subbase.
Fig. 3—T8631A 1-stage heat/1-stage cool thermostat with HEAT-OFF-COOL system and ON-AUTO fan
switching.
H3
TRANS-
H3
CEIVER
H4
BUS OUT
H4
H1
POWER
13.7 VDC
SUPPLY
H2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
JUMPER R AND RC FOR SINGLE TRANSFORMER SYSTEM.
3
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
4
DO NOT CONNECT H BUS WIRES TO THERMOSTAT UNTIL OTHER TotalHome DEVICES ARE CONNECTED.
5
FAN OPERATION SWITCH (4A) IN ELEC. POSITION, USE ONE SYSTEM TRANSFORMER AND JUMPER R TO RC.
6
FOR SINGLE STAGE HEAT PUMP APPLICATIONS, JUMPER W TO Y FOR SINGLE COMPRESSOR CONTACTOR
OPERATION.
M3060
POWER
3
SUPPLY
FAN
SWITCH
SUBBASE
STAT
LOGIC/
LOGIC
CONTROL
CIRCUIT
CIRCUIT
BUS IN
4
+
BUS
POWER
_
SUPPLY
Disconnect power before wiring to prevent electrical
shock or equipment damage.
The shape of the terminal barrier permits insertion of
straight or conventional wraparound wiring connections.
Either method is acceptable.
Refer to Figs. 3-5 for typical hookups of subbase and
thermostat.
NOTE: Keep all wiring restricted to ribbed area surround-
ing terminals to assure thermostat/subbase contact. See
Fig. 6.
Fig. 2—Mounting subbase on wall.
WALL
ANCHORS
(2)
MOUNTING
HOLES
1
2
ON
AUTO
SYSTEM
SWITCH
5
CONV.
ELEC.
2
WALL
WIRES THROUGH
WALL OPENING
SUBBASE
SWITCH UP DISCONNECTS THE HBUS.
FAN CAN BE SET FOR ELECTRIC HEAT OR CONVENTIONAL.
R
C
B
HEAT DAMPER OR
CHANGEOVER RELAY
W
HEAT
G
OFF
2
COOL
6
5
O
COOL DAMPER OR
HEAT/
CHANGEOVER RELAY
COOL
Y
HIGH
RC
LIMIT
1
HBUS
SWITCH
2
FAN
OPERATIONAL
SWITCH FOR
T8631A ONLY
MOUNTING
SCREWS (2)
M3061
1
L1
(HOT)
L2
HEATING SYSTEM
TRANSFORMER
HEAT RELAY
FAN RELAY
COMPRESSOR
CONTACTOR
1
L2
L1
(HOT)
COOLING
SYSTEM
TRANSFORMER
M3066A
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