LV Heat Pump Series
First Stage Compressor Operation
Reversing Valve (energized in cooling)
Auxiliary Electric Heat (runs in conjunction
Transformer 24 VAC Common (extra
Transformer 24 VAC Common (primary
Transformer 24 VAC Hot
UPM DIP SWITCH DEFAULT POSITION
After completing the installation, and before energizing
the unit, the following system checks should be made
prior to initial startup:
Verify that the supply voltage to the heat pump is in
accordance with the nameplate ratings.
Make sure that all electrical connections are tight
Check the electrical fusing and wiring for the correct
Verify that the low voltage wiring between the
thermostat and the unit is correct.
Verify that the water piping is complete and correct.
Check that the water flow is correct, and adjust if
Check the blower for free rotation, and that it is
secured to the shaft.
Verify that vibration isolation has been provided.
Unit is serviceable. Be certain that all access panels
are secured in place.
10. Verify that the blower support has been removed.
11. Verify that duct work has been properly fastened to
supply and return duct collars.
12. Make sure return air filters are positioned correctly
in the filter rack if removed during installation.
LV Heat Pump Series
To obtain maximum performance, clean the air coil
before starting the unit. A 10% solution of dishwasher
detergent and water is recommended for both sides of
the coil. Rinse thoroughly with water.
Use the procedure below to initiate a proper start-up
NOTICE: This equipment is designed for
indoor installation only
This equipment is designed for indoor installation only.
Extreme variations in temperature, humidity and
corrosive water or air will adversely affect the unit
performance, reliability and service life.
A voltage variation of
10% of nameplate utilization
voltage is acceptable.
Unit Starting Conditions
Minimum ambient temperature for heating operation is
45°F. Minimum entering air for heating is 40°F. Minimum
entering water temperature for heating with standard
range units is 50°F and for extended range units is 20°F.
Air and water flow rates must be within the cataloged
These operating limits are not suitable for
continuous operating conditions. Assume
that such start up conditions are for the
purpose of bringing the building space up to
WARNING: When the disconnect switch is
closed, high voltage is present in some
areas of the electrical panel. Exercise
caution when working with the energized
Restore power to system.
Turn thermostat fan position to ON. Blower should
Balance airflow at registers.
Adjust all valves to the full open position and turn on
the line power to the heat pump unit.
Operate unit in the cooling cycle first, then the
heating cycle. for unit operating limits. Allow 15
minutes between cooling and heating tests for
pressure to equalize.
Pre-Start-Up | 15
8 733 905 683 (2016/09)