58
Marvair Wall Mount Heat Pump I&O Manual
06/2023 Rev.7
Economizer Cooling (Check and Record Readings)
After about 10 minutes of operating in the cooling mode, check and record the following data points.
All unit panels MUST be in place for proper operation and testing.
Inside Temperature (IAT)
ºF
Outside Temperature (OAT)
ºF
Return Air Temperature (RAT) db (Should be same temp as IAT)
ºF
Return Air Temperature (RAT) wb (used to calculate RH% of Return Air)
ºF
Supply Air Temperature (SAT) db (Acceptable Range 55ºF (+/- 3ºF)
ºF
Return Air Temperature (SAT) wb (used to calculate RH% of Supply Air)
ºF
Economizer Cooling Stop
Adjust the cooling setpoint to approximately two degrees above the current indoor temperature. The
unit will sequence off.
Is the Economizer Damper Closed? ..................................................................................
❒
Yes
❒
No
Is the indoor blower motor (IBM) Off? ............................................................................
❒
Yes
❒
No
I.
Heating Mode (Mechanical Heating Heat Pump)
Close the Compressor (Cooling) circuit breaker. Close the Heating (Heat) circuit breaker. Power will
be applied to the thermostat / control device. Setup / Configure the control for the desired settings.
Adjust the heating setpoint so there is No demand for heating or cooling. The unit will not be
running.
Heating Start (Mechanical Heating Heat Pump)
If using a standard thermostat, Set the Control to ON, Mode to Heat, Fan to Auto (other controls, set
appropriately for heating mode).
Note: The reversing valve (Marvair Heat Pumps) is de-energized for
“Cooling”. The “O” signal from the thermostat is Not Required.
Adjust the heating setpoint to approximately two degrees above the current indoor temperature. After
the initial start-up delay (.3 to 5 minutes), the unit will sequence on, start heating.
Is the indoor blower motor (IBM) On? .............................................................................
❒
Yes
❒
No
Is the Compressor On? ......................................................................................................
❒
Yes
❒
No
Is the Condenser Fan (CFM) On? (Ambient conditions may be delay CFM) ..................
❒
Yes
❒
No
Is the Heater Off? (Clamp an AmpProbe on one leg of the heater contactor to verify) ...
❒
Yes
❒
No
Heating (Mechanical Heating Heat Pump) (Check and Record Readings)
After about 10 minutes of operating in the heating mode, check and record the following data points.
Inside Temperature (IAT)
ºF
Outside Temperature (OAT)
ºF
Entering Condenser Air Temperature (Should be same temp as OAT)
ºF
Leaving Condenser Air Temperature (Acceptable Range 15º - 20º below OAT)
ºF
Return Air Temperature (RAT) db (Should be same temp as IAT)
ºF
Return Air Temperature (RAT) wb (used to calculate RH% of Return Air)
ºF
Supply Air Temperature (SAT) db (Acceptable Range 15º - 20º above RAT)
ºF
Return Air Temperature (SAT) wb (used to calculate RH% of Supply Air)
ºF
Compressor Amps (L1)
ºF
Compressor Amps (L2)
ºF
Compressor Amps (L3)
ºF
