Carrier 38YY...G Installation Manual page 8

38YY...G / 38YYS...G
Refrigerant connections
Flaring the ends of the tubing
Remove protective caps from copper tube ends.
Position tube end downward, cut the tube to the requested length
and remove the burrs with a reamer.
Do not leave system open to atmosphere any longer than minimum
required for installation.
Oil in the compressor is extremely susceptible to moisture
absorption.
Always keep ends of tubing sealed during installation.
The maximum residual quantity of oil used for tubing is 40 mg/10 m.
Remove flare nuts from the unit connections and place them on the
tube end.
Flare the tube with the flaring tool.
Flare end must not have any burrs or imperfections.
The length of the flared walls must be uniform.
Valve
Wrench mm
1/4"
3/8"
1/2"
5/8"
3/4"
R-410A
Flare nut Valve cap
Nm Wrench mm
17 18 23
22 42 23
26 55 29
29 65 29
36 100 38
1
The unit can be installed:
on the floor;
on the wall using the bracket kit.
Connect tubing in accordance with the limits shown on Table II
(Connections).
Finger-tighten the fitting several turns, then tighten it with a wrench
by applying the tightening torque indicated in the table.
Where required, the unit must be charged with additional
refrigerant.
Additional charge must be added using electronic scales and
the service port (5/16") on the suction line.
Charge refrigerant only in liquid phase (bottle turned upside
down or using the specific connection on bottle; see page 1).
Connection to unit
Insufficient tightening torque will cause gas leaks.
Overtightening the fittings will damage the tube flaring and
cause gas leaks.
Pipe diameter
6.35 mm (1/4")
9.52 mm (3/8")
12.70 mm (1/2")
15.87 mm (5/8")
19.05 mm (3/4")
Tightening torque
Pressure port cap
Nm Wrench mm Nm
20 18 16 - 18 Allen (hex.) 5
20 18 16 - 18 Allen (hex.) 5
40 18 16 - 18 Allen (hex.) 5
40 18 16 - 18 Allen (hex.) 5
40 18 16 - 18 Allen (hex.) 5
E N G L I S H
2
Adjustable wrench
or torque wrench
Tightening torque
Nm
18
42
55
65
100
Valve needle Pressure port
Wrench mm Nm Wrench mm
9 –
9 –
13 –
13 –
13 –
Nm
0.34
0.34
0.34
0.34
0.34
GB - 7