Operating instructions

105
point is set at 5°F. The secondary stage will activate
when the actual room temperature reaches 77°F (72°F
+ 5°F), and will continue to operate until the room once
again becomes 72°F.
K. AUX. HEAT
When in the HEAT PUMP mode, if the outside ambient
temperature is measured to be below 24°F, the control will
automatically select the FURNACE operation. When this
happens, the AUX. HEAT and the HEAT PUMP indicators on
the LCD will illuminate. Once the outside ambient temperature
is measured above 34°F, the control will return to the HEAT
PUMP operation. If your vehicle does not contain a furnace,
and you have a Duo-Therm Heat Pump, once the outside
ambient temperature goes below 24°F, the system will shut
down until the outside temperature reaches 34°F, at which
time the Heat Pump will resume operation.
05
72
L. DEFROST CYCLE
This cycle is active during HEAT PUMP operation and
allows the heat pump to operate down to 24°F. When the
72
outside ambient temperature is less than 42°F and greater
than 24°F, a defrost timing cycle will begin. The defrost
timing cycle will allow operation of the heat pump for 40
minutes. The fan will then be shut off, the refrigerant flow
reversed and run for 4-1/2 minutes, this is the DEFROST
cycle. The refrigerant flow will then be returned to normal
and, after a 30 second delay will continue until the tempera-
ture is greater than 42°F or until the temperature becomes
less than 24°F, at which time the furnace will activate. (See
AUX. HEAT). During the defrost cycle, the DEFROST
indicator on the LCD shall be illuminated.
M. RESET
If the Comfort Control Center is not operational, inad-
equate data or no functions occur, reset the Comfort
Control Center to factory setting. When a reset procedure
is done, all previous program memory is removed. The
factory setting of 72°F for cooling mode and 68°F for
heating modes are entered.
To initiate a RESET, do the following in the order
listed:
1) Turn control on to ensure annunciator data and light
are present. If data and light are present, continue to
next step. If data and light are not present, see Sec.
1.6.
2) Depress MODE switch to activate annunciator light.
3) Simultaneously depress the bottom two buttons (tem-
perature UP and DOWN) and hold.
4) While holding these buttons down, depress the MODE
button once and release.
5) Release the two buttons previously held down.
6) Depress the MODE button once again.
7) At this time the light should extinguish, and the mode
should register "OFF". If not, repeat Steps 2 through 6.
8) Retest system ensuring that all functions are present
and operational.