7
5.
Keypad Lockout
Option switches #1, #2, and #4 should be changed (if
required), programming should be completed, and bat-
tery should be installed before changing option switch #3.
6.
Automatic Changeover from Heat to Cool
The battery maintains the stored program in the event of
a power failure. When attached to the wall with 24v AC
power applied, the thermostat will function normally with-
out the battery. However, the program will be lost in the
event of a power interruption or failure if the battery is not
installed. When power is restored, the thermostat will
automatically maintain a heating temperature of 64
°
F or
a cooling temperature of 82
°
F (factory preprogrammed)
as needed.
CHECK THERMOSTAT OPERATION
When checking thermostat, option switch #4 for auto-
matic changeover must be in the OFF position. This will
allow temporary setting of heat setpoints above cool
setpoints. After system checkout, reset option switch #4
to ON position if automatic changeover is desired (see
SET OPTION SWITCHES).
FAN OPERATION
1.
Turn on power to the system. If the auxiliary heat
source has a standing pilot, be sure to light it.
2.
Press
FAN
SWITCH
until FAN ON is displayed. The blower
should begin to operate.
3.
Press
FAN
SWITCH
until FAN AUTO is displayed. The
blower should stop operating within approximately
one minute.
HEATING SYSTEM
1.
Press
SYSTEM
SWITCH
until HEAT is displayed (it may al-
ready be displayed).
2.
Press
to adjust thermostat to 99
°
F. All stages of
the heating system should begin to operate within
approximately five minutes. However, if the PUMP
LED is flashing, the compressor lockout feature is
operating (see Lockout Bypass Option to tempo-
rarily override the compressor lockout feature during
testing).
COOLING SYSTEM
To prevent compressor and/or property damage,
if power to the compressor has been off or
interrupted for more than 1 hour and the outdoor
temperature is below 50
°
F, DO NOT operate the
system for at least the amount of time the com-
pressor was off! This will allow the compressor
heaters to warm the compressor oils to avoid
damage due to slugging.
1.
Press
SYSTEM
SWITCH
until COOL is displayed.
2.
Press
to adjust thermostat to 40
°
F. All stages of
the cooling system should begin to operate within
approximately five minutes. However, if the PUMP
LED is flashing, the compressor lockout feature is
operating (see Lockout Bypass Option to tempo-
rarily override the compressor lockout feature during
testing).
NOTE
ON
1
2
3
4
Switch #1 (see steps 1-4)
Switch #2 (see steps 1-4)
Switch #3
Switch #4 (see step 6)
ON
ON
1
2
3
4
Switch #1 (see steps 1-4)
Switch #2 (see steps 1-4)
Switch #3 (see step 5)
Switch #4 ON
NOTE
NOTE
CAUTION
!
LOCKOUT BYPASS OPTION
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY. OPERATORS SHOULD NOT USE THIS
FEATURE 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
VIEW
PRGM
and
VIEW
TEMP
buttons at the same time at initial startup.
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.