Installation and User Guide
4
Pub. No. 18HD55D1-1C-EN 09/2020
Part No. 37-7790003
3.
Pull the cover off the thermostat body. Forcing or prying on
the thermostat will cause damage to the unit.
4.
Move base over hole in wall and mark mounting hole
locations on wall using base as template. (See Fig. 1)
5.
Move base out of the way. Drill mounting holes. If you are
using existing mounting holes pull thermostat wire bundle
through the hole in the thermostat base. Secure sub-base
to the wall. Leveling is for appearance only and will not affect
thermostat operation.
6.
Connect wires to terminal block on base using appropriate
wiring diagram.
7.
Push excess wire into wall and plug hole with a fire resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.
8.
Two “AAA” alkaline batteries are included in the thermostat
at the factory with a battery tag to prevent power drainage.
9.
Remove the battery tag to engage the batteries.
4.3 Configuration
FIGURE 2. BATTERY LOCATION
Mounting
Hole
O/B
Terminal
Switch
Selection
W905
Clip for Slow Cycle
W904
W905
W904
Clip for Celsius
Mounting
Hole
W906
Clip for Emergency Heat
Second Stage Fan Control
Electric/Gas Jumper (Fan Option)
If your emergency or auxiliary system will energize the blower,
then jumper W906 on the thermostat base must be cut
(see fig. 1).
If your emergency or auxiliary heat system requires that the
thermostat energize the fan circuit, do not cut jumper W906.
If you are unsure of your application, contact a qualified
service person.
°F or °C Selection
The factory default setting for temperature display is Fahrenheit.
If you want the temperature in Celsius, clip jumper W904.
Fast or Slow Cycle Selection
The factory default setting is fast cycle, which cycles 1st stage
at approximately 1.2°F and 2nd stage 0.75°F. If you prefer slow
cycle, clip jump W905. The 1st stage and 2nd stage would be
1.5°F and 1.2°F respectively.
O/B Terminal Switch Selection
The O/B switch on this thermostat is factory set to “O” position.
This will accommodate the majority of heat pump applications,
which require the changeover relay to be energized in COOL.
If the thermostat you are replacing or the heat pump being
installed with this thermostat requires a “B” terminal, to energize
the changeover relay in HEAT, the O/B switch must be moved
to the “B” position.
Battery Location
This thermostat does not require batteries to operate. The 2
“AAA” alkaline batteries are for the thermostat to remember the
configuration menu selections if AC voltage is lost. If the display
shows
BATT
or when AC power is not present, the batteries
are low and should be replaced with fresh “AAA” Energizer
®
alkaline batteries. For best results, replace all batteries with new
premium brand alkaline batteries. To replace the batteries, install
the batteries along the bottom (see fig. 2). The batteries must be
installed with the positive (+) ends to the right.
