Vacuuming; Tightening Torque; Vacuuming And Charging - McQuay 5WSS Serie Manual De Instrucciones

Unit has to be sufficiently vacuumed to -0.1MPa (-76cmHg). Leave the vacuum for 5 minutes to ascertain the gauge pointer
do not raise again. (Refer to Figure 7 & 8)
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
in mm
1/4 6.35
3/8 9.52
1/2 12.7
5/8 15.88
3/4 19.05
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
High Pressure Gauge (Red)
-76 cmHg ~ 53 kgf/cm 2
Low Pressure Gauge (Blue)
2
-76 cmHg ~ 38 kgf/cm
b) Charge Hose
Operating Pressure
Burst Pressure
Connection size
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being withdrawn from the charging cylinder.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 refrigerant R410A in state will affect the performance and operat-
ing condition of the system. Invert the cylinder that does not come with dip pipe during charging.
Additional Charge Operation
This operation must be done by using a gas cylinder and a precise weighing machine. The additional charge is topped-up into
the outdoor unit using the suction valve via service port.
- Remove the service port cap.
- Connect the low pressure side of the charging gauge to the suction service port, center of the cylinder tank and close the
high pressure side of the gauge. Purge the air from the service hose.
- Start the air conditioner unit.
- Open the gas cylinder and low pressure charging valve.
- When the required refrigerant quantity is pumped into the unit, close the low pressure side and the gas cylinder valve.
- Disconnect the service hose from service port. Put back the service port cap.

VACUUMING

TIGHTENING TORQUE

Torque (Nm)
18
42
55
65
100

VACUUMING AND CHARGING

Gauge Manifold (R410A)
-0.1 ~ 5.3 MPa
1/2 UNF -20
-0.1 ~ 3.8 MPa
Charge Hose (R410A)
5.1 MPa (51 kgf/cm
27.4 MPa (274 kgf/cm
1/2 UNF -20 thread per inch
1-4
Connection Port Size
thread per inch
2
)
2 )