Download Print this page

Mounting The Subbase; Mounting The Thermostat - Honeywell T874 Series Installation Instructions Manual

Thermostat/subbase combinations
Hide thumbs

Advertisement

LOCATION
Install the thermostat about 5 ft [1.5 m] above the floor in
an area with good air circulation at 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.

MOUNTING THE SUBBASE

The thermostat subbase can be mounted on a vertical
outlet box, horizontal outlet box or directly on the wall.
1. If you must mount the subbase on a vertical outlet box,
order 193121A Adapter Assembly (Fig. 1). The as-sembly
includes an adapter ring, two screws and a cover plate to cover
marks on the wall. Install the ring and cover plate on the
vertical outlet box.
For a wall installation, hold subbase in position and mark
holes for anchors (Fig. 2). Obtain wall anchors locally. Take
care that the wires do not fall back into the wall opening. Set
aside subbase. Drill four 3/16 in. [4.8 mm] holes and gently
tap anchors into the holes until flush with the wall.
2. Pull wires through the cover plate (if used) and subbase
cable opening (Fig. 3).
3. Secure the cover plate (if used) and subbase with the
screws provided. Do not fully tighten the subbase screws.
4. Level the subbase using a spirit level, as shown in Fig.
3, and firmly tighten the subbase mounting screws. The
subbase mounting holes provide for minor out-of-level ad-
justments.
IMPORTANT: An incorrectly leveled subbase will cause
the temperature control to deviate from set point.
WIRING THE SUBBASE
IMPORTANT: Use 18-gauge color-coded thermostat cable
for proper wiring.
Disconnect power supply before beginning installation to
prevent electrical shock or equipment damage.
All wiring must comply with local electrical codes and
ordinances. Follow equipment manufacturer wiring instruc-
tions when available. To wire subbase, proceed as follows:
1. Connect the system wires to the subbase as shown in
Figs. 5-7. A letter code located near each terminal is for
identification. The terminal barrier permits straight or con-
ventional wraparound wiring connection (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 prevent
drafts from affecting the thermostat.

MOUNTING THE THERMOSTAT

1. Remove the thermostat cover by pulling the bottom
edge of the cover outward and away from the base until it
snaps free of the mounting slots.
NOTE: The cover is hinged at the top and must be re-moved
by pulling outward at the bottom.
60-1147-4
Fig. 1—Installation of Q674 Subbase on outlet box.
VERTICAL
OUTLET
BOX
MOUNTING
SCREWS (2)
HORIZONTAL
OUTLET
BOX
1
SUBBASE
1 NOT INCLUDED WITH UNIT.
2 ACCESSORY PARTS AVAILABLE (193121A).
Fig. 2—Installation of Q674 Subbase on wall.
WALL
ANCHORS
(2)
M926
Fig. 3—Subbase components and leveling
procedure.
SPIRIT LEVEL
TO SPRING FINGER CONTACTS
ON THE THERMOSTAT
(UP TO 12)
2
1
COVER
ADAPTER
PLATE
RING
2
SUBBASE
MOUNTING
SCREWS (2)
WALL
WIRES THROUGH
WALL OPENING
MOUNTING
HOLES
SUBBASE
MOUNTING
SCREWS (2)
TOP MOUNTING HOLES (2)
WIRING
TERMINAL
THERMOSTAT
CABLE OPENING
MOUNTING HOLES (2)
POST (2) FOR
MOUNTING
THERMOSTAT
2
MOUNTING
SCREWS (2)
M925
M927

Advertisement

loading

  Related Manuals for Honeywell T874 Series

This manual is also suitable for:

T874nQ674cQ674 seriesQ674fT874rQ674l