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Maintenance and Repair
Notes
• Keep the unit in a dry environment, that is clean and well ventilation. Clean the evaporator fins regularly
(once per 1-2 months) in order to maintain high exchange efficiency and save energy.
• The unit has self-diagnosis built into it and as such will display error codes on the control display if any items
need attentions.
Antifreeze Protection of the Unit
In most heating climates antifreeze protection is of great importance to the operation security and service
life of the unit, therefore, please be sure to follow the instructions below:
• The hot water piping must be well insulated to reduce heat loss
• Coiling piping will condensate so to avoid this use water proof piping insulation on child lines also
• Limit the distance of the piping run into the house. Shorter pipes will lose less heat.
• Ensure the drain plug on the bottom of the heat pump pan is elevated 24” so that ice buildup does not plug
drain.
• The unit is equipped with both a drain pan and compressor low temperature supplemental heating trace to
ensure proper operation in low temperature.
• Polypropylene glycol should be used in an appropriate ratio corresponding to the lowest possible ambient
temperature (see table below).
• System pressure drop will increase by 25% with 35% water to glycol mixture so this must be considered
when sizing pump.
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