McQuay 5MDS 50, Installation Manual

Page: 23 / 44

Installation Manual IM-MDS_(i) 19
s o
Close-packed
packing
Hollow
packing
ball valve
(gas side)
A Valve stem
B Stopper pin
C Packing(accessory)
D Connecting pipe(accessory)
E Open
F Cap, copper packing
G Service port
H Flare nut
I Liquid pipe diameter
J Gas pipe diameter
K Field piping
ball valve
(liquid side)
o s
o s
A
B
C
D
J
K
H
G
I
F
E
E
di
am
et
er

The proper steps to insulate the refrigerant piping are shown below.
Pipe Specification
Diameter 6.35 - 25.4mm Diameter 28.58 - 41.3mm
Thickness Min 10mm Min 12mm
Heat resistance
Min100
℃
6.5 Ball valve installation and operation

Operate the gas side ball valve
o
Uninstall the flange connector: remove the flange connector from the piping
o
Stick the seal material to cover the inlet of the ball valve flange to avoid the dirt entry
o
Change the hollow seal pad
o
Fix the flange connector and hollow seal pad and fixed ball valve of gas side with screw bolt.

Liquid side ball valve connecting: expand the copper tube outlet and connect the ball valve connector

Vacuum and charge in refrigerant, ensure to open the valve completely

Calculate the additional refrigerant and charge into units accordingly

Check the looseness to avoid leakage of refrigerant

Copper tube expanded connector dimension. (unit: mm)
External Diameter
Diameter
mm inch
Ф6.35 1/4”
9.0
Ф9.52 3/8”
13.0
Ф12.7 1/2”
16.2
Ф15.88 5/8”
19.4
Ф19.05 3/4”
23.3