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Fig. 9—Typical hookup for MABS XX Control Panel with T874A Thermostat/Q674B,E Subbases in single-
stage heating-cooling zone system.
M1636
1
2
3
4
5
6
7
8
9
ADD-A-
ZONE
HEAT FAN COOL HEAT FAN COOL HEAT FAN COOL
YWGGh
456Z
DAMPER
ACTUATOR
12
3X
L1
(HOT)
L2
1
MABS XX
CONTROL PANEL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
WIRE ONLY THE TERMINAL CONNECTIONS SHOWN. SOME TERMINALS NOT AVAILABLE ON ALL THERMOSTATS. IF THERMOSTAT HAS
R/RC/RH TERMINALS, JUMPER TOGETHER AND WIRE AS SINGLE R TERMINAL. DO NOT CONNECT THERMOSTAT O AND B TERMINALS
TO CONTROL PANEL.
2
ZONE 1
ZONE 2 ZONE 3
O B RC RH
12 GYRW
M6 M4 M1 VO VC
ZONE 1
G
YRW
M6 M4 M1 VO VC
ZONE 2
GYRWM6
M4
M1 VO VC
ZONE 3
OPEN CLOSE
DAMPER
ZONE SYS
ZONE 1
OPEN CLOSE
DAMPER
ZONE SYS
ZONE 2
OPEN CLOSE
DAMPER
ZONE SYS
ZONE 3
FAN FAN FAN
G
Y1
Y2
R
W1
W2
O
T874A
THERMOSTAT/
Q674B OR E
SUBBASE
2
456Z
DAMPER
ACTUATOR
123X
G
Y1
Y2
R
W1
W2
O
T874A
THERMOSTAT/
Q674B OR E
SUBBASE
2
456Z
DAMPER
ACTUATOR
123X
G
Y1
Y2
R
W1
W2
O
T874A
THERMOSTAT
Q674B OR E
SUBBASE
2
CAC FC
TO SINGLE-
STAGE
HEATING/
COOLING
EQUIPMENT
MCM
B B B