McQuay MAC 100 CR User Manual

33
7. PROBLEMS AND TROUBLESHOOTING
Symptoms Possible Cause Troubleshooting
1
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
2
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)
3
'- -' 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.
4
ON/OFF, COOL or
HEAT button not
function
• Module defective • Change a new module
5
Cannot switch to
HEATING mode
• Software limitation
• Ensure this mode is available in current "Model" of
Chiller. Please refer to 6.2.4
6
Cannot switch to
BOILING mode
• Software limitation
• Ensure this mode is available in current "Model" of
Chiller. Please refer to 6.2.4
7
No "Manual Defrost"
item
• Software limitation • Ensure current running mode is HEATING
8
Cannot step inside [Set
Parameter]
• Software limitation. Panel
has not received all the
information from Chiller
completely
• Refer to symptoms 3
9
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
10
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
11
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
12
Time always reset to
12:00am,1
St
Jan 2000
• No backup battery
• Energy of the backup
battery is low
• Replace a coin cell battery
13
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.

McQuay MAC 100 CR Specifications

General

Brand	McQuay
Model	MAC 100 CR
Category	Chiller
Language	English