Operating instructions

22
A. Cool Mode
In Cool Mode, the system cycles the compressor On and Off based on room air temperature and
temperature set-point on the CT thermostat. The fan turns on rst, followed by the compressor
approximately 2 minutes later. There are three fan speeds in Cool Mode:
● “Low”: Fan operates continuously at low speed. The compressor cycles On and Off.
● “High”: Fan operates continuously at high speed. The compressor cycles On and Off.
● “Auto”: Fan speed varies depending on the difference between the temperature set-point
and room air temperature. The compressor and the fan cycle On and Off with the CT
thermostat.
B. Furnace Mode
There are three fan speeds in Furnace Mode:
● “Low”: Fan operates continuously at low speed.
● “High”: Fan operates continuously at high speed.
● “Auto”: Fan is Off.
If additional indoor air circulation provided by the air conditioner is NOT desired during
Furnace Mode, select “Auto” in Fan Mode to shut the air conditioner fan off. If “Low” or
“High” is selected, the air conditioner fan will continue to operate at the selected speed.
In Furnace Mode the system cycles the RV furnace On and Off based on room air temperature
and temperature set-point on the CT thermostat. CT thermostat can be congured to operate using
an On / Off differential of either 1ºF (-17 °C) or 2ºF (-16.6 °C). This feature is programmed during
the system initialization.
To set the temperature differential, the system must be Off. Press the Down ( ) button and simul-
taneously press and hold the / Mode button for three seconds. Press the Up ( ) button to tog-
gle between “d1” and “d2”, “d1” for 1ºF (-17 °C) differential and “d2” for 2ºF (-16.6 °C) differential.
C. Heat Pump Mode (Select Models)
In Heat Pump Mode, the system cycles the compressor On and Off based on room air temperature
and temperature set-point on the CT thermostat. When the system calls for heating there will be a
delay of approximately 2 minutes. There are three fan speeds in Heat Pump Mode:
● “Low”: Fan operates continuously at low speed. The compressor cycles On and Off.
● “High”: Fan operates continuously at high speed. The compressor cycles On and Off.
● “Auto”: Fan speed varies depending on the difference between the temperature set-point
and room air temperature. The compressor and the fan will cycle On and Off with the CT
thermostat. Compressor shuts off rst followed by the fan in approximately 15 seconds.
This mode of operation is a customer option usually selected when temperatures are below 70 ºF
and the user needs to warm the living space. This reverses refrigerant ow in the air conditioner,
causing warm air to be dispensed inside rather than cold, and cold air is dispensed outside rather
than warm.
This mode of operation can cause a dilemma where the outside coil, which is now dispensing cold
air, can freeze up due to cold air blowing across the coil mixed with outside temperature. A system
freeze up can render the heat pump inoperable. There is a defrost feature that prevents this from
happening. See "C. Defrost Cycle" on page 23 for more information.
MODE DESCRIPTION