39
Marvair Wall Mount Heat Pump I&O Manual
06/2023 Rev.7
Wires from temperature
sensor mounted in
supply air.
Figure 7 - Temperature Sensor Wires
2. Turn the unit on and the Hot Gas Reheat is operating.
3. Set the digital VOM for DC milliamp voltage. The milliamp voltage shown on the meter’s
display corresponds to the desired air temperature (ºF). Insert the probes of the meter into the
negative (black) and positive (red) set point test terminals on the board. Carefully, and in small
increments, turn the blue knob on the potentiometer until the volt meter displays the desired
milliamp voltage (temperature). Airxcel Commercial Group recommends 70ºF and no lower
than 68ºF and no higher than 78ºF. Allow the refrigerant system to stabilize for at least five
minutes and adjust the temperature as desired.
Adjustment Knob
Positive (Red)
Negative (Black)
Figure 8 - Desired Temperature Set Point
4.4 Ventilation System Set-Up:
Manual Fresh Air System (Configuration N)
. This is the standard ventilation system in Marvair heat
pumps. Fresh air ventilation by means of a damper can provide up to 15% of rated air flow of outside
air. The damper has four positions corresponding to 0, 5, 10 and 15% of rated air flow of outside air.
The damper only opens when the indoor fan is operating. Position the screw on the side of the damper
hood for the desired air flow.
