T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—88
Fig. 5. Installing Q674 Subbase on wall.
Fig. 6. Subbase components and leveling procedure.
Wire Subbase
Disconnect power suppl
before be
innin
installation to
prevent electrical shock or e
uipment dama
e.
All wirin
must compl
with local electrical codes and
ordinances.
IMPORTANT
Use 18 gauge, solid-conductor wire whenever possi-
ble. If using 18 gauge stranded wire, no more than
10 wires can be used. Do not use larger than
18 gauge wire.
Follow e
uipment manufacturer wirin
instructions when
available. To wire subbase, proceed as follows:
1.
Connect the s
stem wires to the subbase as shown in
the applicable dia
ram. A letter code is located near
each terminal for identification. T
pical terminal desi
-
nation and wirin
connections are listed in Table 5. The
terminal barrier permits strai
ht or wraparound wirin
connection. See Fi
. 7. The subbase can re
uire one or
more
umpers that ma
or ma
not be factor
-supplied.
See Fi
. 8 and the wirin
dia
rams for specific terminals
to be
umpered.
Fig. 7. Barrier configuration.
CAUTION
Equipment Damage Hazard.
Never install more than one wire per terminal unless
usin
factor
-supplied
umper with spade terminal.
2.
Firml
ti
hten each terminal screw.
3.
Fit wires as close as possible to the subbase. Push
excess wire back into the hole.
4.
Plu
hole with nonflammable insulation to prevent drafts
from affectin
the thermostat.
WIRES THROUGH
WALL OPENING
WALL
WALL
ANCHORS
(2)
SUBBASE
MOUNTING
SCREWS (2)
M926
MOUNTING
HOLES
SPIRIT LEVEL
M927
WIRING
TERMINAL
THERMOSTAT
CABLE OPENING
TO SPRING FINGER
CONTACTS ON
THE THERMOSTAT
UP TO 12
MOUNTING
HOLES (4)
POST FOR
MOUNTING
THERMOSTAT (2)
FOR STRAIGHT
INSERTION
–
STRIP 5/16 IN. (8 MM)
FOR WRAPAROUND–
STRIP 7/16 IN. (11 MM)
SUBBASE TERMINAL SCREW
M928
BARRIER
