![background image](http://html1.mh-extra.com/html/midea/rsj-420-pzn1-h/rsj-420-pzn1-h_technical-manual_1791198060.webp)
MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual
60
Often check the working situation of each part in the unit, and check the inner pipe connectors of
the unit and whether the high and low pressure detecition ports of the refrigerant has oil dirty, to
make sure the unit has no refrigerant leakage.
Switch check for the electricity leakage protector.
The leakage flow protector of electric control box operates a period (Generally a month), should
be in the closed power on state to press the test button, check the leakage flow protector is
normal or not (each time press the button, the leakage flow protector should be broken off once),
if it is not normal and check the cause of the accident when be found, allowing once power on,
and then, if no operation, it should find out the reason of the fault, and if necessary, do the
movement characteristic test; if it is confirmed by the check for the leakage flow protector itself
fails, it should be timely replacement or repaired.
After running for a long time, the heat transfer surface of water side heat exchanger will deposit
calcium carbonate or other minerals, when these substances on the heat transfer surface scale
is large, then can affect the heat transfer performance and lead to increased power consumption,
high air exhaust pressure (or suction pressure is too low). It can use the organic acids such as
formic acid, citric acid, acetic acid detergent for cleaning. Do not use detergents containing
fluoride chlorate, due to the material of the water side heat exchanger is stainless steel or copper,
which is easily to be corrosive and cause refrigerant leakage.
Clean the water side heat exchanger should be conducted by professionals.
After using cleaning agent, use the clean water to clean the water pipe and heat exchanger, in
case of the waterproof system will be corrosive or has cleaning scale after adsorption.
Under using the clean agents, it should accord to the dirt deposition to adjust the detergent
concentration, cleaning time and temperature.
It needs to neutralize the waste liquid after cleaning; the waste liquid processing should contact
the relative company.
The cleanser have corrosion effect for the eyes, skin, nasalmucosa etc., so the protection device
must be used in the cleaning process (such as protective glasses, protective gloves, protective
mask, protective shoes, etc.) in order to prevent the inhalation or contact with the cleaner.