Auto Random Re-Start Function; Indicator Lights - McQuay CEX20E Installation Manual

2. Additional Charge
The refrigerant is pre-charged in the outdoor unit. If the piping length is less than 7.6m, then additional charge after vacuuming
is not necessary. If the piping length is more than 7.6m, then use the additional charge valve as indicated in the table.
Additional Charge in Gram (R22 models)
Model 10m
15E / ER 30/60
20E / 20ER 75/125
25E / 25ER 190/250
Liquid Side
Indoor Unit
Gas Side
Check
Valve
Hi
Low
Open
Close
If there is a power cut when the unit is operating, it will automatically resume the same operating mode when the power is
restored. (Applicable only to units with this feature).
Wireless Remote Control
Cooling
– – –
– – –
1
1
2 2
3 3
4 4
5 5
6
6
– – – –
15m 20m
60/120 90/180
150/250 225/375
380/500 570/570
Outdoor Unit
Discharge Valve
Open
Suction Valve
Open

AUTO RANDOM RE-START FUNCTION

INDICATOR LIGHTS

Heating
Cool mode
Dry mode
Fan mode
Heat mode
Defrost
Indoor sensor missing / Short
Outdoor sensor missing / Short
Communication error
Compressor overload
Pump fault
Compressor overheat / Gas leak
Outdoor overcurrent
IPM / PFC / Partial switching
– – – Indoor fan feedback error
Additional Charge in Gram (R410A models)
Model
15E / ER
20E / ER
25E / ER
3. Charge Operation
This operation must be done by using a gas cylinder and a
precise weighing machine. The additional charge is topped-
up into the outdoor unit using the suction valve via the service
port.
• Remove the service port cap.
• Connect the low pressure side of the charging gauge to the
suction service port center of the cylinder tank and close
the high pressure side of the gauge. Purge the air from the
service hose.
• Start the air conditioner unit.
• Open the gas cylinder and low pressure charging valve.
• When the required refrigerant quantity is pumped into the
unit, close the low pressure side and the gas cylinder valve.
• Disconnect the service hose from service port. Put back
the service port cap.
Operating / Faulty Indication
7
10m 15m
26/56 52/112
67/112 135/225
17/225 342/450
Action
–
–
–
–
–
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20m
78/168
202/337
513/675