McQuay M5WSS Installation Manual download pdf (Page 36)

Tightening Torque

Use proper torque wrench to tight the flare nuts. If the torque strength is weak, gas leakage may occur. If it is

too tight, the flare nut may crack and it may be non-removable.

Diameter D Torque(Nm)

in mm

1/4 6.35 18

3/8 9.52 42

1/2 12.7 55

5/8 15.88 65

3/4 19.05 100

Vacuuming and Charging

Use a vacuum pump with a back flow preventing adapter to prevent the vacuum pump oil mix with R410A

which will create sludge and damage the equipment. Use only gauge manifold exclusive for R410A for

vacuuming and charging.

a) Gauge Manifold

Gauge Manifold(R410A) Connection Port Size

High Pressure Gauge (Red) -0.1~5.3 Mpa

-76 cm Hg ~ 53 kgf/cm

Low Pressure Gauge (Blue) -0.1 ~ 3.8 Mpa

-76 cm Hg ~ 38kgf/cm

½ UNF-20

thread per inch

b) Charge Hose

Charge Hose (R410A)

Operating Pressure 5.1 MPa (51 kgf/cm

)

Burst Pressure 27.4 MPa (274 kgf/ cm

)

Connection Size ½ UNF-20 thread per inch

The different size of connection port from the conventional is to prevent wrong refrigerant charging instead

of R410A.

c) Refrigerant Cylinder

A typical R410A charging cylinder will be identified with the refrigerant name and is coated with pink in

colour as designated by ARI.

R410A is mixture of refrigerant which have different evaporating temperature. So when charging, make sure

only liquid is being withdrawn from the charging cylinder. Charging gas state will affect the performance and

operating condition of the system. Invert the cylinder that does not come with dip pipe during charging.

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McQuay M5WSS Installation Manual Page 36