Commissioning; Checking List Before Commissioning; Commissioning Record Table; Common Problems During Commissioning - McQuay MDS 30 Installation Manual


When charging R410A with cylinder which is without the siphon pipe, turn the cylinder upside down when
charging to ensure only liquid refrigerant is charged into the system.
to indoor unit
to indoor unit
refrigerant
tank
HI
LO
compound
weighbridge
pressure gauge

9.0 Commissioning

9.1 Checking list before commissioning


Ampere of indoor & outdoor units is normal and under protection value?

Power supply for indoor and outdoor units is normal?

Dip switch address setting up for indoor units are ok?

Indoor unit is power on?

Communication wiring is ok?

Refnet is well installed?

Condensing water drainage system is ok?

Earthing is ok?

Insulation testing (10Mega Ω)

Power supply check (220-240V/380-415V)

System has been vacuumed and charged with additional refrigerant?

How many indoor units are controlled by outdoor unit controller?

Outdoor unit ball valve is opened?

9.2 Commissioning record table


Before commissioning, power on the system 24 hours in advance to preheat the crankcase heater.
Suction
No.
pressure(bar)
1
2
3
4
5
6

9.3 Common problems during commissioning

Symptoms
No heating or cooling
Fan stop when heating
Pump keep running
26
REFRIGERANT CHARGING SKETCH
service port
ball valve
to indoor unit
liquid pipe
gas pipe
to indoor unit
ball valve
refrigerant
tank
outdoor
LO
unit
weighbridge
Discharge
Voltage
pressure
(V)
(bar)
Wiring controller
Cannot select cooling or heating
Defrost
No indication
service port
ball valve
liquid pipe
gas pipe
ball valve
outdoor
HI
unit
compound
pressure gauge
Suction
Ampere
temperature
(A)
(℃ )
Possible reason
When one indoors units in heating, all
indoors in heating mode
Fan stop running when defrosting
Pump keep running to drain the water
Syphon pipe
The cylinder had Syphon pipe
Ambient
Checking person
Temp.(
/ Time
℃ )
Installation Manual IM-MDS_(i)