McQuay MAC Specifications download pdf (Page 34)

7. PROBLEMS AND TROUBLESHOOTING

Symptoms Possible Cause Troubleshooting

Panel gets hot

abnormally

• Wiring fault in 12VDC supply

• Change a new panel module and turn ON the unit again

after the verification

• Wiring fault in the 12VDC

supply

• Correct the wiring problem

• No power supply • Check the wiring and supply 12VDC to panel

• Voltage supply too low • Check the power source

The LCD no display

(blank screen)

• Module defective • Change a new panel module

• Panel cannot/not yet

received the information

from Chiller or FCU

completely

• Ensure the selected unit exists in the network.

• Ensure the wiring is correct.

• Ensure the wiring is not defective.

• Ensure the wiring has been isolated from high power cable

• That particular unit address

is not recognized by the

panel

• Select a coherent unit address on the panel (refer to

6.2.2)

'- -' for all status (quite

a long time)

• Module defective • Change a new module

• Software limitation

• Ensure it is pressed (hold 1s) in [Summary Pages],

not in others menu.

ON/OFF, COOL or

HEAT button not

function

• Module defective • Change a new module

Cannot switch to

HEATING mode

• Software limitation

• Ensure this mode is available in current "Model" of

Chiller. Please refer to 6.2.4

Cannot switch to

BOILING mode

• Software limitation

• Ensure this mode is available in current "Model" of

Chiller. Please refer to 6.2.4

No "Manual Defrost"

item

• Software limitation • Ensure current running mode is HEATING

Cannot step inside [Set

Parameter]

• Software limitation. Panel

has not received all the

information from Chiller

completely

• Refer to symptoms 3

7 Days Programmable

Timer not function

• Software limitation. User

did not activate the

schedule

Control of Chiller:

• Ensure the "Timer" in [Timer Menu] is set ENABLE

Control of Chiller:

• Ensure the "Timer" in [Operation Menu] is set

ENABLE

No beeping sound

when new alarm

occurred

• Software limitation. User

did not set ON to the alarm

buzzer

• Ensure "Buzzer" in [Panel Option] is set ON

No screen saver after

timeout

• Software limitation. User

did not set ENABLE to the

screen saver

• Ensure "Screen Saver" in [Panel Option] is set

ENABLE

Time always reset to

12:00am,1

Jan 2000

• No backup battery

• Energy of the backup

battery is low

• Replace a coin cell battery

Panel stop operation.

Whole operation

freezing (hang)

• Unstable power supply

• Energy of the backup

battery is low

• Power off the panel. Take out the backup battery as

well. Replace with a new 3V coil cell battery if

necessary. Put back the backup battery into the

panel and power on again.

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McQuay MAC Specifications Page 34

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