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Heating System
1. Move SYSTEM switch to HEAT position. If the auxiliary
heating system has a standing pilot, be sure to light it.
2. Press to adjust thermostat setting to 90° and hold for five
seconds. Both stages of the heating system should begin to
operate. However, if the word HEAT is flashing, the com-
pressor lockout feature is operating (see Lockout Bypass
Option to temporarily override the compressor lockout fea-
ture during testing).
3. Press to adjust temperature setting below room tem-
perature. The auxiliary heating system will stop immedi-
ately, and the first stage will stop within three to four
minutes.
Cooling System
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
1. Move SYSTEM switch to COOL position.
2. Press to adjust thermostat setting below room tempera-
ture. The blower should come on immediately on high speed,
followed by cold air circulation. However, if the fan is running
but the compressor is not running and the word COOL is
flashing, the compressor lockout feature is operating (see
Lockout Bypass Option to temporarily override the com-
pressor lockout feature during testing).
3. Press
to adjust temperature setting above room tem-
perature. The cooling system should stop operating.
O/B TERMINAL SWITCH SELECTION
The O/B switch on this thermostat is factory set to the “O”
position. This will accommodate the majority of heat pump
applications, which require the changeover relay to be ener-
gized in COOL. If the thermostat you are replacing or the heat
pump being installed with this thermostat require the “B” termi-
nal, to energize the changeover relay in HEAT, the O/B switch
must be moved to the “B” position.
ARMCHAIR PROGRAMMING
Armchair Programming is a unique feature that allows your
thermostat to be programmed before being mounted on the wall.
If you do not want to Armchair Program, the thermostat can be
programmed after being mounted on the wall and system power
turned on.
If you wish to Armchair Program your thermostat, temporarily
hold a new 9-volt battery against the wires in the battery cutout
on the back of the thermostat base for approximately 45 sec-
onds. This will provide a charge that will last approximately 30
to 45 minutes to allow the thermostat to be programmed. After
programming, the thermostat must be mounted on the wall,
wires connected and system power turned on.
To have sufficient time to complete the installation without losing
the programming, hold the 9-volt battery to the terminals on the
back of the base for 30 to 45 seconds again after programming
the thermostat. The battery must be removed before mounting
the thermostat on the wall.
ADJUSTABLE ANTICIPATION
The first stage has anticipation that can be set to 2.5 or 4 cycles
per hour for heating or cooling. The second stage heat has a
fixed anticipation. To change the first stage anticipation in the
HEAT or COOL mode, press SET TIME and VIEW PRGM
buttons at the same time until the desired setting is displayed
(S for slow (factory setting) or F for fast).
CHECK THERMOSTAT OPERATION
If at any time during testing your system does not operate
properly, contact a qualified serviceperson.
Fan Operation
1. Turn on power to the system.
2. Move SYSTEM switch to OFF position.
3. Move FAN switch to ON. The blower should begin to operate.
4. Move FAN switch to AUTO position. The blower should stop
within a short period of time.
NOTE
LOCKOUT BYPASS OPTION
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY. OPERATORS SHOULD NOT USE THIS FEA-
TURE DUE TO POSSIBILITY OF EQUIPMENT OR
PROPERTY DAMAGE, OR PERSONAL INJURY.
COMPRESSOR SHORT TERM
CYCLE PROTECTION
This thermostat has a built-in short term (5-minute)
time delay. During this 5-minute period, the thermo-
stat will lock out the compressor to allow head pres-
sure to stabilize. If you want to override this feature
while testing thermostat operation, simply press
and at the same time.
DO NOT USE THE LOCKOUT BYPASS OPTION
UNLESS THE COMPRESSOR OIL HEATERS HAVE
BEEN OPERATIONAL FOR 6 HOURS AND THE
SYSTEM HAS NOT BEEN OPERATIONAL FOR AT
LEAST 5 MINUTES.
CAUTION
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