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T874A,D,R THERMOSTATS AND Q674B,D,F,Q SUBBASES
CAUTION
1.
Disconnect power supply to prevent electrical
shock or equipment damage.
2.
Run wires as close as possible to the subbase.
To prevent interference with the thermostat
linkage, keep wire length to a minimum. Push
excess wire back into the hole, and plug the
hole to prevent drafts from affecting the
thermostat operation.
3.
Do not overtighten the thermostat captive
mounting screws because damage to the
subbase threads can result.
4.
Do not short across coil terminals on the relay.
This can burn out the heat indicator.
IMPORTANT
An incorrectly leveled thermostat can cause the
temperature control to deviate from setpoint. It is
not a calibration problem.
Location
Install the thermostat about 5 ft (1.5m) above the floor in a
well-circulated area of average temperature.
Do not install the thermostat where it can be affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
Mount Subbase
The subbase can be mounted on a vertical or horizontal
outlet box (see Fig. 1) or directly on the wall (see Fig. 2).
To mount the subbase on a vertical outlet box, order
193121A Adapter Assembly, which includes an adapter
ring, two screws and a cover plate to cover marks on
the wall.
IMPORTANT
An incorrectly leveled subbase can cause the
temperature control to deviate from setpoint.
To mount the subbase on the wall:
Hold the subbase in position and mark the holes for
the anchors. Wall anchors must be obtained locally.
Make sure that the wires do not fall back into the
wall opening.
Set aside the subbase.
Drill four 3/16 in. (4.6 mm) holes and gently tap the
anchors into the holes until flush with the wall.
Pull electrical wires through the cover plate, if used,
and through the subbase wire opening. See Fig. 2.
Secure the cover plate and subbase with the two
screws provided, but do not fully tighten the screws.
The subbase mounting slots allow minor out-of-level
adjustments. Level the subbase using a spirit level,
as shown in Fig. 3, and tighten the subbase
mounting screws.
69-0107—2
1
HORIZONTAL
OUTLET
BOX
SUBBASE
SUBBASE
MOUNTING SCREWS (2)
CAPTIVE
MOUNTING SCREWS (2)
1
NOT INCLUDED WITH UNIT.
2
ACCESSORY PART AVAILABLE (193121A).
Fig. 1. Installation of Q674 Subbase on outlet box.
WALL
ANCHORS
(2)
M926
Fig. 2. Installation of Q674 Subbase on wall.
2
VERTICAL
MOUNTING
OUTLET
SCREWS (2)
1
BOX
ADAPTER
RING
2
O L
C O
8 0
7 0
6 0
5 0
8 0
7 0
6 0
5 0
A T
H E
6 0
5 0
WALL
WIRES THROUGH
WALL OPENING
MOUNTING
HOLES
MOUNTING
SUBBASE
SCREWS (2)
COVER
PLATE
2
THERMOSTAT
THERMOSTAT
COVER
8 0
7 0
M6009
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