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CAUTION
1. Disconnect the power supply to prevent elec-
trical shock and 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 thermo-
stat operation.
3. Do not tighten the thermostat captive mount-
ing screws to the point of damaging the sub-
base threads.
4. Do not short across coil terminals on the relay.
This may burn out the heat anticipator.
IMPORTANT: Thermostats are calibrated at the factory by
using subbases mounted at true level. Inaccurate sub-
base leveling will cause thermostat control deviation.
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 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 THE SUBBASE
The thermostat subbase can be mounted on a vertical
outlet box, horizontal outlet box or directly on the wall.
1. To mount on a vertical outlet box, order Honeywell
193121A Adapter Assembly. See Fig. 1. The assembly
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. The horizontal outlet box requires
placing the subbase on the box and tightening two mount-
ing screws.
For a wall installation, hold the subbase in position and
mark the holes for the anchors. See Fig. 2. Obtain wall
anchors locally. Be careful that the wires do not fall back
into the wall opening. Set subbase aside. Drill two 3/16 in.
[5 mm] holes and gently tap anchors into the holes until
flush with the wall.
2. Pull electrical wires through the cover plate (if used)
and subbase cable opening. See Fig. 3. See Wire the Sub-
base section before pulling any wires.
IMPORTANT: Use 18 gauge, color-coded thermostat
cable for proper wiring.
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, see Fig. 3, and
firmly tighten the subbase mounting screws. The subbase
mounting holes allow for minor out-of-level adjustments.
IMPORTANT: An incorrectly leveled subbase will cause
the temperature control to deviate from set point.
Fig. 1—Installation of subbase on outlet box.
VERTICAL
OUTLET
BOX
MOUNTING
SCREWS (2)
HORIZONTAL
OUTLET
1
BOX
NOT INCLUDED WITH UNIT.
1
ACCESSORY PARTS AVAILABLE (193121A).
2
Fig. 2—Installation of subbase on wall.
WALL
ANCHORS
(2)
M926
Fig. 3—Subbase components and leveling
procedure.
TOP
MOUNTING
HOLES (2)
SPIRIT LEVEL
MOUNTING
HOLES (2)
2
1
COVER
ADAPTER
PLATE
2
RING
2
SUBBASE
MOUNTING
SCREWS (2)
MOUNTING
SCREWS (2)
SUBBASE
M925
WALL
WIRES THROUGH
WALL OPENING
MOUNTING
HOLES
MOUNTING
SUBBASE
SCREWS (2)
THERMOSTAT
WIRING
CABLE OPENING
TERMINAL
POST (2) FOR
TO SPRING FINGER
MOUNTING
CONTACTS ON THE
THERMOSTAT
THERMOSTAT
(UP TO 12)
M927
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