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Installation Of Subbase On Outlet Box; Installation Of Subbase On Wall; Wiring The Subbase; Subbase Components And Leveling Procedure - Honeywell Q674L Installation Instructions Manual

Thermostats with subbases
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VERTICAL
OUTLET
BOX
MOUNTING
SCREWS (2)
HORIZONTAL
OUTLET
1
BOX
NOT INCLUDED WITH UNIT.
1
ACCESSORY PARTS AVAILABLE (193121A).
2
Fig. 1. Installation of subbase on outlet box.
WIRES THROUGH
WALL OPENING
WALL
ANCHORS
(2)
M926
Fig. 2. Installation of subbase on wall.
2. Run wires to the thermostat location.
3. Pull wires through the cover plate (if used) and sub-
base cable opening. See Fig. 3.
IMPORTANT
Use 18 gauge, color-coded thermostat cable for
proper wiring.
1
COVER
ADAPTER
PLATE
RING
2
SUBBASE
MOUNTING
SCREWS (2)
MOUNTING
SCREWS (2)
SUBBASE
WALL
MOUNTING
HOLES
MOUNTING
SCREWS (2)
SUBBASE
T874R THERMOSTATS AND Q674L SUBBASES
4. Secure the cover plate (if used) and subbase with
the screws provided. Do not fully tighten the
subbase screws.
5. Level the subbase by using a spirit level. Firmly
2
tighten subbase mounting screws. See Fig. 3. The
subbase mounting holes provide for minor out-of-
level adjustments.
IMPORTANT
An incorrectly leveled subbase causes the
temperature control to deviate from setpoint.

Wiring the Subbase

All wiring must comply with local electrical codes and
ordinances. Follow equipment manufacturer wiring
instructions when available. To wire subbase, proceed as
follows:
1. Connect the system wires to the subbase. See Fig.
5-12. A letter code for identification is located near
each terminal. The terminal barrier permits straight
or conventional wraparound wiring connection. See
Fig. 4.
2. Firmly tighten each terminal screw.
3. Fit wires as close as possible to the subbase. Push
excess wire back into the hole.
M925
4. Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
SPIRIT LEVEL
MOUNTING
HOLES (2)
Fig. 3. Subbase components and leveling procedure.
FOR STRAIGHT
INSERTION–
STRIP 5/16 IN. (8 MM)
SUBBASE TERMINAL SCREW
3
TOP
WIRING
MOUNTING
TERMINAL
HOLES (2)
POST (2) FOR
MOUNTING
THERMOSTAT
FOR WRAPAROUND–
STRIP 7/16 IN. (11 MM)
BARRIER
Fig. 4. Wiring connections.
THERMOSTAT
CABLE OPENING
TO SPRING FINGER
CONTACTS ON THE
THERMOSTAT
(UP TO 12)
M927
M928
69-0392—9

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