Service manual

8
In gas heat mode, the gas furnace will provide the only source
of heat and the heat pump is locked out.
NOTE
The temperature displays in degrees Fahrenheit as a
factory set default (See Figure 2). To display in
degrees Celsius, move the jumper marked “F” and
“C” to bridge between middle pin and position “C”,
then cycle 12 volt power off and then back on.
WIRING THE WALL THERMOSTAT
OEM must supply these mating parts to connect
these thermostats per Figure 1. The plugs must be
connected to motorcoach wiring harness before the
base is secured to the wall.
Heat Pump Example To Bring On Gas Furnace As Backup Heat
Setpoint Indoor Temp. Operation
70 70+ No functions occur
\\\ 69 Heat Pump turns on (Primary heat source)
71 Heat Pump turns off (Thermostat satisfied)
69 Heat Pump turns on
65 Gas Furnace turns on, Heat Pump turns off (Heat Pump not able to
satisfy Thermostat) (First strike for backup heat counter)
71 Gas Furnace turns off (Thermostat satisfied)
69 Heat Pump turns on
65 Gas Furnace turns on, Heat Pump turns off (Heat Pump is again unable
to satisfy Thermostat), (Backup heat counter reaches 3
rd
strike and Heat
Pump is locked out for 2 hours), backup heat counter is reset if Heat
Pump is running for more than 20 minutes and does not call for backup
heat
71 Gas Furnace turns off (Thermostat satisfied)
69 Gas Furnace turns off (Becomes Primary heat source)
71 Gas Furnace turns off (Thermostat Satisfied)
\\\ After 2 hour lockout
69 Heat Pump turns on (Resumes as Primary heat source)
65 Gas Furnace turns on, Heat Pump turns off (Becomes Primary heat
source) (Heat Pump is locked out for another 2 hours)
71 Gas Furnace turns off (Thermostat Satisfied)
\\\ After 2 hour lockout
69 Heat Pump turns on (Resumes as Primary heat source)
71 Heat Pump turns off (Thermostat Satisfied) (Backup heat counter is
reset any time Heat Pump satisfies thermostat setpoint and does not
need Gas Furnace)
The word “DIFF” will display on LCD when backup heat is operating
and the heat pump is locked out. There is a 30 second delay between
Stage 1 and Stage 2. There is also a 3 minute anti-short cycle delay time
for cooling.
The chart below shows the system functions with the 6536-335* thermostat. After the entire air
conditioning system (and furnace system) is installed, check each position function.