Wiring Connections; Jumper Rc And Rh Terminals For Single Transformer System - Honeywell TROL-A-TEMP Q674B Installation Instructions Manual

Zone thermostats/subbases
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letter code is located near each subbase terminal for identi-
fication. The terminal barrier permits straight or conven-
tional wraparound wiring connection (Fig. 4).
2. Some Q674 Subbases have RC and RH terminals
for isolated heating and cooling transformers. For zoning
systems, jumper RC and RH terminals as shown in Fig. 5
and wire as single R terminal.
3. Firmly tighten each terminal screw.
4. Fit wires as close as possible to the subbase. Push
excess wire back into hole.
5. Plug the hole with nonflammable insulation to pre-
vent drafts from affecting the thermostat.
Fig. 4—Wiring connections.
FOR STRAIGHT
INSERTION–
STRIP 5/16 in. [8 mm]
SUBBASE TERMINAL SCREW
Fig. 6—Typical hookup for MM-2 Mini-zone Control Panel with T874A Thermostat/Q674B,D Subbase in
single-stage heating-cooling two-zone system.
MINIZONE
(MM-2)
CONTROL
PANEL
TO SINGLE-
STAGE
HEATING/
COOLING
EQUIPMENT
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
2
ZONE 1 O AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION.
3
JUMPER RC AND RH TERMINALS TOGETHER AND WIRE AS SINGLE R TERMINAL.
4
DO NOT CONNECT W2 AND Y2 TERMINALS TO CONTROL PANEL.
FOR WRAPAROUND–
STRIP 7/16 in. [11 mm]
BARRIER
M928
HEAT
RELAY
Y2
Y1
O
G2
G1
RC
COOL
RH
B
W2
W1
24 V, 40 VA
E
TRANSFORMER
L2
1
L1
(HOT)
Fig. 5—Jumper RC and RH terminals for single
transformer system. Strip wire 3/4 in. [19 mm].
T874A THERMOSTAT/Q674B SUBBASE
3
2
O
G
B
Y1 RC RH W1
COOL
RELAY
CHANGEOVER
CONTROL
ZONE 1
O1
T6
G1
T5
FAN
B1
T4
HEAT
B
M6
2
M4
1
M1
4
5
DAMPER
ACTUATOR
1
2
3
R C
R H
R C
R H
T874A THERMOSTAT/
Q674D SUBBASE
4
3
4
W2 Y2
Y1
Y2 RC RH W2
ZONE 1
ZONE 2
RELAY
RELAY
ZONE 2
T6
T5
T4
M6
M4
M1
6
Z
4
5
6
DAMPER
ACTUATOR
1
2
3
3
X
M1633
M929
W1
Z
X
69-0580—2

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