McQuay M5WSS Manual de instalación descargar pdf (Pagina 195)

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Fault Cause/ Check Point

Air conditioner

cannot start

1. Power supply plug disconnected.

2. Circuit breaker or fuse tripped / blown.

3. Wiring connection

4. If fault persist, contact your installer

Neither fan coil unit

and compressor run

1. The fuse may be blown or circuit breaker opened.

2. Check electrical circuit or motor winding for shorts or grounds. Investigate

for possible over loading. Replace fuse if necessary.

3. Check wiring connections. Wire may be loosening. Replace or tighten.

4. Control system may be faulty

Compressor does not

operate.

1. Check capacitor if available. Replace capacitor if faulty.

2. Check wiring connection. Wire may be loosening. Replace or tighten.

3. The high pressure switch may tripped due to:

a) No or insufficient water flows into and leaves heat exchanger. May

be clogged.

b) Water entering temperature higher than the maximum operating

conditions.

c) Not enough air flow into fan coil unit. May be due to dirty filter or

block by object, cardboard and etc (heating mode).

d) Fan coil motor failure (heating mode).

e) Unit over-charged. Release some of the refrigerant charge.

4. The compressor internal/external overload protection is opened. If the

compressor body is extremely hot, the overload will not reset until it cooled

down.

5. The compressor winding may be grounded to the compressor shell. If so,

replace the compressor.

Insufficient cooling or

heating.

1. Check controller temperature setting.

2. Filter may be clogged. Check and clean the filter.

3. Check capillary tube for possible restriction of refrigerant flow. Replace

capillary tube if proven so.

4. The reversing valve may be defective (valve position is not shifted properly),

creating a bypass of refrigerant. Check the reversing valve coil connection.

5. Check for restriction of air and water flow.

6. Refrigerant leakage. Check all piping bends and connection for leakage.

Repair the leakage area or replace with new piping.

7. Window or door wide open.

8. Unit may be under-sized.

Remote control

display light is too

dim.

1. Battery flat. Replace the battery.

2. The batteries are not properly positioned

Insufficient water flow

through heat

exchanger

1. Valves are not opened fully.

2. Circulating water pump is faulty.

3. Water pipes or strainers are clogged.

Noisy operation

1. Check for loose bolts or screws.

2. Make sure rubber isolators are used for installation.

3. Check for water balance to unit for proper water flow rate.

4. Check for tubing touching compressor or other surface. Readjust tubing by

bending it slightly.

5. Fan (fan coil unit) knocking / hitting on its housing.

6. May be due to worn compressor bearing.

192

When a malfunction of the air conditioner unit is detected, immediately switch off the main power supply

before proceeding with the following troubleshooting procedures.

The following are common fault conditions and simple troubleshooting tips. If any other fault conditions

which are not listed occur, contact your nearest local dealer. DO NOT attempt to troubleshoot the unit by

yourself.

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McQuay M5WSS Manual de instalación Pagina 195

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