Haier CA0035EAND Service Manual page 25

■ Electrical Connection
Before circuit connection, following safety rules and measures must be adhered to:
1. The unit must be installed by our service personnel or specially trained installation personnel. The installation
shall be in accordance with applicable national and local laws, regulations and standards on electrical, building
and environmental protection, etc., and requirements in the installation manual. Removal or addition of control
components is not allowed without permission. We are not liable for any unit damage or casualty due to non-
conformance with these requirements.
2. Circuits shall be connected as per "electrical connection". We provide each unit with a wiring diagram, which is
located inside the control cabinet.
3. The ground wire of the unit shall be well grounded. The ground wire is not allowed to be connected to gas pipe,
water pipe or telephone wire, because improper grounding may lead to electric shock.
4. Before startup, check power supply for compliance with requirements.
■ Operation Inspection
■ Necessary inspection and pre CAUTIONs before startup
1. Confirm all electrical connections are firm.
2. Ensure the unit is installed horizontally and sufficiently supported at bottom.
3. Ensure no water seepage occurs and valves operate normally.
4. All screws necessary for panels are installed firmly and securely.
5. Confirm no refrigerant is leaked.
6. Confirm electrical and pipe connection is consistent with the scope shown on unit nameplate, wiring diagrams
and other relevant documents.
7. Confirm insulations of all temperature sensors are not damaged.
■ Inspection before operation
1. Ensure power supply is consistent with what required on unit nameplate.
2. Unit circuits are connected. Check whether power supply wire is routed and connected correctly and ground
wire is firmly connected. Check interlocking devices of water pump, etc. are connected correctly.
3. Water pipes and relevant pipes. Water pipes and relevant pipes must be flushed for at least two or three times
without any pollutant.
4. Check the water circulation system. Check whether water is sufficient and air is exhausted completely, and
ensure there is no leakage.
5. Before initial startup or restart after shutdown over a long time, the power supply must be switched on to heat
crankcase for at least 12 hours.
6. The water filter is installed as required, and there is no pollutant on the water filter screen.
■ Inspection of operation status
When the unit operates stably, check the followings:
1. Temperature at water inlet of the unit.
2. Temperature at water outlet of the unit.
3. Outlet flow.
4. Operating current of compressor.
5. Operating current of fan.
6. High/low pressure value during cooling (heating).
You may determine whether the unit operates normally on the basis of above data.
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