Confirm there is no wrong connection in terminals and the main panel of AC contact, etc. Confirm all
the electric connections are not loose; all the electric components (AC contactor and relay, etc.) are
connected firmly and safely. Especially pay attention to the condition of the connecting wire between
control components and electric control box and power cord. The power wire shall not be warped,
and the insulation cover shall not have cracks and cut. Check the energy consumption in starting and
operating the unit is in the permitted range.
2. Water system Connection: confirm the water system does not leak water. If the unit has not been
used for a long period, it is necessary to open the drain valve of the water pump to empty the water
pump, tube pipe or shell pipe type heat exchanger and all the water in the pipes. If the ambient
temperature may drop below 0℃, it is more necessary to be done.
If the water in the unit is not emptied, the main switch of the power supply must keep close, and the
unit is set in heating mode, thus it can prevent from freezing by the heating temperature sensor. Do be
careful when cleaning the filter.
3.Cleaning of tube in tube type (or shell&tube type) heat exchanger: when using the unit, for
example, when using hard water, sometimes it will produce dirty. In this condition, it is
recommended to install the filter to remove dirty. The heat exchanger shall use cleaning solution
to be washed; the solution can be weak acid solution, use pump to drive the cleaning solution in
the heat exchanger.
The installation of the liquid container for weak acid solution can be permanent or as an optional
device. If there is spare connecting pipe, the portable cleaning device can be installed in the pipes
at any time.
In order to fulfill a better cleaning effect, the circulation flow speed of the acid solution shall be 1.5
times of normal water flow, if can use acid solution to wash the pipe in an opposite direction again,
the effect will be better. Finally, use a large amount of water to repeatedly wash the acid solution
The unit shall be cleaned periodically, not until the unit is blocked. The cleaning frequency is
determined by the water quality being used, but generally, once a year is rather reasonable.
4. Refrigerant Circuit: Confirm the refrigerant and refrigerant oil does not leak from the
compressor. Check if the pressure in the high/low pressure side is normal. Check the inside
cleanness of the plate type heat exchanger by pressure drop.
5.Control: Check the operation of all the delays, high/low pressure protection and control.
1. If needing to replace the refrigerant of the unit, its quantity shall be in accordance with the data
on the nameplate. Before replacing, the previous gas must be released as empty as possible.
2. During operation, all the panels must be installed properly, including the panel on the control