56
Marvair GAA A/C w/Gas Heat I&O Manual
06/2023 Rev.5
Chapter 6 Start-Up
Before lighting the unit, smell around the unit for gas. Be sure to smell next to the floor because LP gas
is heavier than air and will settle on the floor.
The gas valve on your unit is equipped with an ON/OFF knob. Use only your hand to turn the knob Never
use tools. If the knob will not push in or turn by hand, do not try to repair it. Call a qualified service
technician. Force or attempted repair may result in a fire or explosion.
The air conditioner with gas heat is equipped with an automatic spark ignition system. There is no pilot.
In case of a safety shutdown on units with electronic temperature control, shut main disconnect OFF
and then back ON to reset ignition control. On units with an electro-mechanical thermostat, move the
thermostat switch to OFF and return the thermostat switch to HEAT. On initial start-up of the unit in the
heating mode, a burn-off of excess paint and oils remaining from the manufacturing process may cause
some smoking and smell for 5-10 minutes.
6.1 Cooling Cycle
1. Set the fan switch to "Auto" and the system switch to "Off".
2. Move the cooling temperature on the wall thermostat to a point higher than the room temperature.
Move the heating temperature to a temperature that is lower than the room temperature.
3. Set the thermostats system switch to "Cool" or "Auto" position. Nothing should operate at this time.
4. Set the time delay in the control box to three minutes. Note that time delay is an option on some units
and may not be on your air conditioner.
5. Remove the cover plate from the thermostat. Slowly lower the thermostat cooling temperature. Once
the indoor fan turns on, allow approximately three minutes for the compressor and outdoor fan to
start.
For units equipped with the low ambient control, note that the outdoor fan may not come on immediately,
because it is cycled by refrigerant pressures. Some units have a time delay module which prevents the
compressor from restarting immediately after interruption of power. See Cooling Mode section of the
Installation Instructions for details on the operation of the low ambient control and the time delay.
6.2 Heating Cycle
1. Turn off electrical power to the unit.
2. Set thermostat to its lowest setting.
3. Remove heat section access panel.
4. Turn knob on the gas control valve to ON. Do not force. Never light the burner with a match or torch.
Figure 12. Gas Control Valve On Switch
