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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.
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 22 AWG (American Wire Gage) wire; for a maxi-
mum distance from unit of 100 ft, use 18 AWG wire.
5. Level mounting base against wall and mark wall through
the 2 mounting holes in base.
6. Drill two
3
⁄
-in. mounting holes in wall where marked.
16
CAUTION: 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
⁄
-in. to prevent adjacent wires from shorting to-
1
4
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.
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. 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.
Fig. 1 — Thermostat Mounting
NOTE: Some large commercial rooftop heat pump units (542J)
must be configured with Advanced Setup Step 3 (Heat Pump
Operation) set to OFF. Refer to the base unit instructions for
more information.
Table 1 — Thermostat Wiring Terminations
EXISTING
WIRE
DESIGNATION
G or F
Y1, Y, or C
W1, W, or H
Rh, R, M, Vr, or A
C
O/B
Y2
W2
RS+5
RS
RS G
CK1
CK2
*Terminals C, Y2, and W2 may not be used in all applications.
†Used on Heat Pump applications only.
IV. CONFIGURE ADVANCED SETUP
To enter into the advanced setup screens of the thermostat,
press the Mode and Backlight 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 Backlight button at any time to exit
the Advanced Setup mode.
A. Unoccupied Cooling and Heating Set Points (Steps 1
and 2)
When the thermostat is used in conjunction with an external
device wired to the dry contacts, the thermostat is placed in
Unoccupied mode when the contacts open or close (depend-
ing on the configuration of advanced setup Step 9). The ther-
mostat will control cooling and heating to the Unoccupied
Cooling and Heating Set Points.
—2—
TERMINAL
FUNCTION
CONNECTION
Fan
Cooling
Heating
Power (24 v)
Common
Reversing Valve
W1/O/B†
Second Stage Cooling
Second Stage Heating
Remote Sensor (5 vdc)
Remote Sensor Signal
Remote Sensor Ground
Dry Contact Switch 1
Dry Contact Switch 2
G
Y1
W1/O/B
R
C*
Y2*
W2*
RS+5
RS
RS G
CK1
CK2
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