Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 171

About brazing
● Be sure to braze while supplying nitrogen gas.
If no nitrogen gas is supplied, a large amount of impurity
（oxidized film）will be generated, which may clog the capillary
tube and the expansion valve, resulting in fatal malfunction.
Table 1 Pipe specification
Single type
● Be sure to use pipes of 1／2H material, and wall thickness
above 1mm. （Pressure resistance of O-type pipe is not enough.）
Table 2 Parts used for the connecting pipe assembly
No. Name
1 Accessory pipe A
2 Straight pipe
3 Straight pipe
4 Elbow
Table 3 Length and specification of straight pipe （Procured in the field）
Straight pipe
Straight pipe
（Internal face
of base）
Elbow,procured
in the field
Connection example
of refrigerant pipe－
（Rightward connection）
Refrigerant line （one way） length（m）
200V ≦35（m） φ22.22 x t1.0
250V ≦70（m） φ25.4 x t1.0 or φ28.58 x t1.0
≦35（m） φ22.22 x t1.0
280V
≦60（m） φ25.4 x t1.0 or φ28.58 x t1.0
Quantity
1 Accessory
1 Procured at the field
1
Procured at the field
1 or 0
2
（Not required for downward direction）
Procured at the field
1 or 0
（Not required for downward direction）
Downward Forward
A B
400mm or more 192.5－202.5mm 192.5－202.5mm
1
-
105mm or more 155mm or more
2
76
（Internal face
of base）
Service valve
connecting position
at gas side
Accessory pipe A
Straight pipe
（Procured in the field,
192.5－202.5mm）
Straight pipe
（Procured in the field,
155mm or more）
Braze the refrigerant
C pipe here
Remark
Rightward
C D
370mm or more
（Internal face
of base）
1
2
Elbow,procured
in the field
Connection example
of refrigerant pipe－
（Backward connection）
170
- -
'21 • PAC-SM-383
A
Accessory pipe A x 1 pc.
Heat insulating material is attached
to the accessory pipe with band.
When installing the heat insulating
material, cut the band and retrieve it.
B
Accessory pipe B x 1 pc.
● Branching pipe set can be used by
using the accessory pipe B.
When φ22.22（O.D.） size of the
indoor unit gas pipe is used, the
accessory pipe B is unnecessary.
Accessory
pipe A
Straight pipe
Backward
φ22.22（O.D.） to be
procured locally
210mm
Elbow to be
procured locally
Straight pipe
φ22.22（O.D.） to be
procured locally
Service valve connecting
position at gas side
44
（Internal face of base）
Accessory pipe A
Straight pipe
（Procured in the field,
210mm）
Braze the refrigerant
pipe here
Straight pipe
（Procured in the field,
370mm or more）
D
1
Branching pipe set
（DIS-WB1G,DIS-TB1G）
Accessory pipe B
Field piping
φ22.22（O.D.）
2
1
2