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T874D MULTISTAGE THERMOSTAT AND Q674A,D SUBBASES
4. Level the subbase using a spirit level. See Fig. 3,
and firmly tighten subbase mounting screws. The
subbase mounting holes provide for minor out-of-
level adjustments.
IMPORTANT
An incorrectly leveled subbase will cause the
temperature control to deviate from setpoint. It is
not a calibration problem.
VERTICAL
OUTLET
BOX
MOUNTING
SCREWS (2)
HORIZONTAL
OUTLET
1
BOX
NOT INCLUDED WITH UNIT.
1
ACCESSORY PARTS AVAILABLE (193121A).
2
Fig. 1. Installation of Q674 Subbase on outlet box.
WIRES THROUGH
WALL OPENING
WALL
ANCHORS
(2)
M926
Fig. 2. Installation of Q674 Subbase on wall.
Wiring the Subbase
All wiring must comply with local electrical codes and
ordinances. Follow equipment manufacturer's wiring
instructions when available. To wire subbase, proceed as
follows:
1. Connect the system wires to the subbase. See
Fig. 5 and 6. A letter code is located near each
terminal for identification. The terminal barrier
permits straight or conventional wraparound wiring
connection. See Fig. 4.
69-0774B—1
1
COVER
ADAPTER
PLATE
RING
2
SUBBASE
MOUNTING
SCREWS (2)
MOUNTING
SCREWS (2)
SUBBASE
WALL
MOUNTING
HOLES
MOUNTING
SCREWS (2)
SUBBASE
SPIRIT LEVEL
2
MOUNTING
HOLES (2)
Fig. 3. Subbase components and leveling procedure.
2. Firmly tighten each terminal screw.
3. Fit wires as close as possible to the subbase. Push
excess wire back into the hole.
4. Plug hole with nonflammable insulation to prevent
drafts from affecting the thermostat.
FOR STRAIGHT
INSERTION–
STRIP 5/16 IN. (8 MM)
SUBBASE TERMINAL SCREW
M925
Mount Thermostat
1. Remove the thermostat cover by pulling the bottom
edge of the cover upward until it snaps free of the
mounting slots.
NOTE: The cover is hinged at the top and must be
2. Carefully remove and discard the polystyrene
packing insert that protects the mercury switches
during shipment.
3. Turn over thermostat base and note the spring
fingers that engage the subbase contacts. Make
sure the spring fingers are not bent flat, preventing
proper electrical contact with the subbase.
4. Note the two tabs on the top inside edge of the
thermostat base. The tabs fit into corresponding
slots on top of the subbase. Mount the thermostat
on the subbase.
5. Align the two captive mounting screws in the
thermostat base with the posts on the subbase. See
Fig. 7. Tighten both screws. Do not overtighten
screws or damage to subbase posts can result.
2
TOP
WIRING
MOUNTING
TERMINAL
HOLES (2)
POST (2) FOR
MOUNTING
THERMOSTAT
FOR WRAPAROUND–
STRIP 7/16 IN. (11 MM)
BARRIER
Fig. 4. Barrier configuration.
removed by pulling up at the bottom.
THERMOSTAT
CABLE OPENING
TO SPRING FINGER
CONTACTS ON THE
THERMOSTAT
(UP TO 12)
M927
M928
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