● When needs to be repaired, please entrust after-sale service department or a specialized
personnel to implement. If improper repaired, it may cause unit operation failure, electric shock, fire,
hurt, leaking, etc.
● Can not install the unit in combustible gas easy-leaking places, once the combustible gas leaks
around the unit, it may cause a fire.
● Confirm if the installation base is strong enough, if it is not strong and has been used for a long time,
it may cause falling and injuries.
● Confirm if leakage protection switch is installed, if don't install a leakage protection switch, may
cause electric shock or fire.
● When cleaning the unit, the operation should be stopped, and power switch should be turned off.
3. Heat pump unit working principle
3.1 Heat pump working process
● First, the low pressure and superheated gas in the evaporator is inhaled into the compressor then
becomes the high temperature and high pressure overheated vapour.
● Second, the overheated vapour is exhausted into the condenser and exchange the heat with the
water, then the refrigerant is condensed and becomes the saturated or over cooling high pressure
and high temperature refrigerant liquid. The water is heated up by heat pump when absorbing the
heat energy which released by the refrigerant.
● Third, the refrigerant liquid releases the pressure by passing the expansion valve, then becomes
the low temperature and low pressure liquid.
● Fourth, the refrigerant liquid flows into the evaporator and absorb the energy from the air, then is
vaporized and became the low pressure and overheated vapour. The refrigerant working repeatedly
as described above, then the water which flows through the condenser is heated up constantly, the
temperature rise and can get the hot water.
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