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
NOTE
To have sufficient time to complete the installation without losing the programming, hold the
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.
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
!CAUTION
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.
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
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.
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