Carrier 38BC - Flaring Tubing Ends; Connecting to the Unit

GB - 7
38BC / 38BH
R-410A
ENGLISH
Where required, the unit must be charged with additional
refrigerant.
Additional charge must be added using electronic scales and
the service port (1/2") on the suction line (gas).
Charge refrigerant only in liquid phase (see page 1).
IMPORTANT:
Open the three way valves only after having completed the
pipe connections and evacuation.
Connection to unit
Insufficient tightening torque will cause gas leaks.
Overtightening the fittings will damage the tube flaring and
cause gas leaks.
Pipe diameter Tightening torque
Nm
6.35 mm (1/4”)18
9.52 mm (3/8”)42
12.70 mm (1/2”)55
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.
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.
The unit can be installed:
햲 on the floor;
햳 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.
Refrigerant connections
햴 Adjustable wrench
or torque wrench
L
L
햲
햳
Tightening torque
Valve
Flare nut Valve cap Pressure port cap Valve needle Pressure port
Wrench mm Nm Wrench mm Nm Wrench mm Nm Wrench mm Nm Wrench mm Nm
1/4” 22 18 23 20 18 16 - 18 Allen (hex.) 5 9 – 0.34
3/8” 22 42 23 20 18 16 - 18 Allen (hex.) 5 9 – 0.34
1/2” 26 55 29 40 18 16 - 18 Allen (hex.) 5 13 – 0.34
햴