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II. INSTALL THERMOSTAT
WARNING:
Before installing thermostat, turn off all
power to the unit. There may be more than one power
disconnect. Electrical shock can cause injury or death.
1. Turn off all power to unit.
2. If an existing thermostat is being replaced:
a. Remove existing thermostat from the wall.
b. Disconnect wires from existing thermostat. Do not
allow wires to fall back into the wall. As each wire
is disconnected, record wire color and terminal
connection.
c. Discard or recycle old thermostat.
NOTE: Mercury is a hazardous waste and must be disposed
of properly.
3. Remove the thermostat cover from wall plate (mount-
ing base) to expose mounting holes. See Fig. 1. With
the thermostat facing forward, press the back plate on
the left hand side top corner to release the two prongs
holding on the cover. Pull off the cover when the prongs
have been disengaged.
4. Route thermostat wires through large hole in mount-
ing base. Remove outer sheath from wires for added
flexibility. Standard solid or multi-conductor thermo-
stat wire should be used from the thermostat to the
unit. Size and length considerations are as fol-
lows: for a maximum distance from unit of 36 ft,
use 22AWG (American Wire Gage) wire; for a maxi-
mum distance from unit of 100 ft, use 18AWG wire.
5. Level mounting base against wall and markwall through
the 2 mounting holes in base.
6. Drill two
3
⁄
16
-in. mounting holes in wall where marked.
WARNING:
Be careful not to drill into wiring in wall.
Electrical shock could result.
7. Secure mounting base to wall with 2 screws and an-
chors provided. Ensure all wires exit through hole in
mounting base.
8. Adjust wire length and routing to allow proper closure
of the thermostat. Strip each wire at the end no more
than
1
⁄
4
-in. to prevent adjacent wires from shorting to-
gether. Match and connect wires to terminals on the
thermostat. See Fig. 2-4 and Table 1.
CAUTION:
Improper wiring or installation may cause
damage to the thermostat. Check to ensure wiring is
correct before proceeding with installation of unit.
9. Push excess wiring into wall. Seal hole in wall to pre-
vent drafts.
10. Re-attach thermostat cover to back plate by aligning
the top two prongs of the back plate inthe vertical groove
of the top cover and then snapping the cover onto the
back plate.
11. Turn on power to unit. The thermostat will receive power
from the unit. The thermostat will be powered by 24 v,
nominal (18 to 30 vac). Terminals R (+ 24 v), W1/O/B
(first stage heat or reversing valve),Y1 (first stage cool-
ing), and G (fan relay) will always be connected. Some
applications will use C (common),Y2 (second stage cool-
ing), or W2 (second stage heating).
III. SET CLOCK
The Set Clock button allows the user to change the time and
day displayed on the thermostat. Press the Set Clock button.
The current time will blink on and off. Press the UP ARROW
and DOWNARROW buttons until the correct time is shown.
Hold down the buttons to quickly move through the time dis-
play. Press and hold the Fan button while pressing the UP or
DOWN ARROW buttons to scroll through by hours. The AM
and PM annunciators will automatically change. To ensure
the schedules are properly followed, make sure that AM or
PM is correct for the time chosen. When the correct time is
shown, press the Mode button to modify the day of the week.
The current day will blink on and off. Press the UP ARROW
and DOWN ARROW buttons until the correct day is shown.
Press the Set Clock button again to exit the Set Time mode.
IV. HEAT PUMP CONFIGURATION
To configure the thermostat for heat pump operation, Ad-
vanced Setup Steps 3 (Heat Pump Operation) and 4 (Revers-
ing Valve Polarity) must be configured correctly. See the
Configure Advanced Setup section for information on config-
uring these options.
NOTE: Some large commercial rooftop heat pump units (542J)
must be configured withAdvanced Setup Step 3 (Heat Pump
Operation) set to OFF. Refer to the base unit instructions for
more information.
V. CONFIGURE ADVANCED SETUP
To enter into the advanced setup screens of the thermostat,
press the Mode and Program buttons at the same time. The
Advanced Setup Step number is shown in the top right cor-
ner of the thermostat screen. Use the Mode button to ad-
vance through the steps. There are 17 Advanced Setup Steps.
See Table 2. Press the Program button at any time to exit the
Advanced Setup mode.
NOTE: Advanced Setup Steps 1 and 2 are configured with
the Set Clock button, and are not accessed through the ad-
vanced setup screens.
Fig. 1 — Thermostat Mounting
—2—