McQuay MWMV Specifiche Scaricare il pdf (Pagina 23)

Unit Operation Check List

 Connect supply power to the unit and conrm green

LED illuminates on the Mark IV control board.

 Adjust all valves to their full open positions. Turn on

the line power to all heat pumps.

Note: Room temperature should be within the mini-

mum-maximum ranges. During start-up checks,

loop water temperature entering the heat pump

should be between 55°F [13°C] and 90°F [32°C].

If either return air temperature or water tem-

perature are at a minimum or maximum level,

the other must be at normal condition for proper

operation of the heat pump.

 Adjust the unit thermostat to the fan only position

and check for fan operation.

 With the thermostat in “Auto” adjust to minimum

setpoint. Compressor start-up could take up to 6

minutes depending on thermostat conguration.

Verify compressor operates and cool air is delivered.

Complete start-up sheet beginning on page 32

of this manual. Conrm unit capacity is within 10%

of the catalog THR. It is not necessary to connect

refrigeration gauges unless unit troubleshooting is

required and all external air and water conditions

are veried to be adequate.

 Verify the condensate trap lls to provide a air seal

with the drain system.

 Adjust thermostat to warmest setting and conrm

compressor operation. Conrm warm air is delivered

after a few minutes of operation.

 Check for vibration, noise and water leaks. Inspect

piping and wiring for rubbing. Make adjustments

as needed for rubbing lines or wiring. It is the

responsibility of the installer to make nal unit

adjustments.

 If unit does not operate properly perform

troubleshooting as needed.

Troubleshooting

Should a major problem develop, refer to the following

information for possible cause and corrective steps.

Neither fan nor compressor runs:

1. The fuse may be blown or the circuit breaker is

open. Check electrical circuits and motor windings

for shorts or grounds. Investigate for possible

overloading. Replace fuse or reset circuit breakers

after fault is corrected.

2. Wires may be loose or broken. Replace or tighten.

3. Supply voltage may be too low. Check it with the

power company.

4. Control system may be faulty. Check thermostat

for correct wiring and check 24 volt transformer for

burnout.

Fan operates but compressor does not:

1. Check capacitor.

2. Wires may be loose or broken. Replace or tighten.

3. The high pressure may have tripped due to:

a. Fouled or plugged condenser.

b. Lack of or no condenser water.

c. Too warm condenser water.

d. Not enough airow over the coil due to dirty

lters.

e. Coil or fan motor failure.

4. The low temperature switch may have tripped due to:

a. Fouled or plugged condenser.

b. Lack of or no condenser water.

c. Too cold condenser water.

d. Not enough airow over the coil due to dirty

lters.

e. Coil or fan motor failure.

5. Check thermostat setting, calibration and wiring.

6. The compressor overload protection is open. If the

compressor dome is extremely hot, the overload

will not reset until cooled down. If the overload

is external, replace it. If the overload is internal,

replace the compressor.

7. The internal winding of the compressor motor may

be grounded to the compressor shell. If so, replace

the compressor.

8. The compressor winding may be open. Check

continuity with ohmmeter. If the winding is open,

replace the compressor.

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