Honeywell T874G Installation Instructions Manual page 3

Fig. 2—Installation of Q674 Subbase on wall.
WIRES THROUGH
WALL OPENING
WALL
ANCHORS
(2)
M926
IMPORTANT: Use 18 gauge, color-coded thermostat
cable for proper wiring.
3. Pull wires through the cover plate (if used) and
sub-base cable opening. See Fig. 3. Take care that wires
do not fall back into the wall opening.
4. Secure the cover plate (if used) and subbase with the
screws provided. Do not fully tighten the subbase screws.
5. Level the subbase using a spirit level, as shown in
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 set point.
WIRING THE SUBBASE
All wiring must comply with local electrical codes and
ordinances. Follow equipment manufacturer wiring instruc-
tions when available. To wire subbase, proceed as follows:
WALL
MOUNTING
HOLES
SUBBASE
MOUNTING
SCREWS (2)
Fig. 3—Subbase components and leveling
procedure.
TOP MOUNTING HOLES (2)
SPIRIT LEVEL
TO SPRING FINGER CONTACTS
ON THE THERMOSTAT
(UP TO 12)
Fig. 4—Wiring Connections.
FOR STRAIGHT
INSERTION–
STRIP 5/16 in. [8 mm]
SUBBASE TERMINAL SCREW
1. Connect the system wires to the subbase as shown
in Figs. 5-11. A letter code located near each terminal is
for identification. 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.
4. Plug hole with nonflammable insulation to pre-
vent drafts from affecting the thermostat.
3
WIRING
TERMINAL
THERMOSTAT
CABLE OPENING
MOUNTING HOLES (2)
FOR WRAPAROUND–
STRIP 7/16 in. [11 mm]
BARRIER
POST (2) FOR
MOUNTING
THERMOSTAT
M927
M928
69-0435—10