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Honeywell TROL-A-TEMP Q674B Installation Instructions Manual page 5

Zone thermostats/subbases
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Fig. 8—Typical hookup for MABS II and MABS II-L Control Panels with T874D Thermostat/Q674B,D
Subbases in multistage heating-cooling zone system. MABS II Control Panel shown; MABS II-L Control
Panel hookup is the same.
MABS II
CONTROL PANEL
EM. HEAT
RELAY
Y2
Y1
O
G2
TO SINGLE-
G1
STAGE
HEATING/
RC
COOLING
EQUIPMENT
RH
B
W2
W1
E
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
JUMPER RC, RH TOGETHER AND WIRE AS SINGLE R TERMINAL.
3
ZONE 1 O AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION.
4
IF SINGLE-STAGE COOLING, DO NOT CONNECT Y2; IF SINGLE-STAGE HEATING, DO NOT CONNECT W2.
T874D THERMOSTAT/Q674B SUBBASE
2
RC
O
G
B
Y2 W2
SECOND
FAN
HEAT
COOL
STAGE
RELAY
RELAY
RELAY
RELAY
CHANGEOVER
CONTROL
O1
COOL
G1
FAN
ADD-A-ZONE
A4
B1
HEAT
A3
E1
EM. HEAT
A2
2
24 V, 40 VA
A1
1
TRANSFORMER
1
L2
L1
(HOT)
T874D THERMOSTAT/
Q674D SUBBASE
3
4
RC Y2
Y1
RH W1
CAC
ZONE 1
RELAY
RELAY
ZONE 1
T8
T7
T6
T5
T4
M6
M4
M1
4
5
6
Z
DAMPER
ACTUATOR
1
2
3
X
5
T874D THERMOSTAT/
Q674D SUBBASE
2
4
RC Y2
W2
Y1 RH W1
ZONE 2
ZONE 3
RELAY
RELAY
ZONE 2
ZONE 3
T8
T8
T7
T7
T6
T6
T5
T5
T4
T4
M6
M6
M4
M4
M1
M1
4
5
6
Z
DAMPER
ACTUATOR
1
2
3
X
2
4
W2
Y1 RH W1
4
5
6
Z
DAMPER
ACTUATOR
1
2
3
X
M1393A
69-0580—2

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