Service manual

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Serial No. Model
Indoor Unit
⑤
Ducted Type MC-D09AI
Indoor Unit
④
Ducted Type MC-D09AI
Indoor Unit
③
Ducted Type MC-D09A
Indoor Unit
②
Ducted Type MC-D09AI
Indoor Unit
①
Ducted Type MC-D18AI
Liquid Refrigerant Pipe
Serial No. e d c b a
Diameter φ6.35 φ6.35 φ6.35 φ6.35 φ9.52
Length 20m 20m 15m 5m 5m
The total length of each liquid refrigerant pipe is: e+d+c+b+a=20+20+15+5+5=65m. Thus, the minimum additional
refrigerant charge
=
(65-50)
×
0.022=0.33kg (Note: no additional refrigerant is needed for the liquid pipe within 50m).
4) Additional Refrigerant Charge Record
Indoor Unit
No. Indoor Unit Model Additional Refrigerant Charge(kg)
1
2
……
N
Total
Refrigerant Pipe
Diameter Total Length(m) Additional Refrigerant Charge(kg)
Φ15.9
Φ12.7
Φ9.52
Φ6.35
Total
c. Items to be checked after the Installation
Items to be Checked Possible Errors Check Results
Has each part and component the of unit
installed securely?
The unit may fall off, vibrate or generate noise.
Has the gas leakage test been taken? The cooling (heating) capacity may be poor.
Is the thermal insulation sufcient? Dews and water drops may be generated.
Does the drainage go well? Dews and water drops may be generated.
Is the actual power voltage in line with
the value marked on the nameplate?
The unit may break down or some
components may be burnt out.
Are the wiring and the piping correct?
The unit may break down or some
components may be burnt out.
Has the unit been earthed reliably? There may be a danger of electric shock.
Does the wire meet the regulated requirement?
The unit may break down or the
component may be burnt out.
Is there any obstacle at the air inlet/outlet
of the indoor/outdoor unit?
The cooling (heating) capacity may be poor
Have the length of the refrigerant pipe and
the refrigerant charge been recorded?
It may be hard to know the exact refrigerant charge.
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