Refrigerant Connections - Carrier 42VQV050 Installation Manual

42VQV

Refrigerant connections

Make refrigerant connections before connecting the
system to the power supply.
Refer to the outdoor unit installation manual for tube
sizing, and limitations (slopes, length, number of curves
allowed, refrigerant charge, etc.)
Model Gas
42VQV (Suction)
mm
050
12,70
080
15,87
• For refrigerant tubes use seamless, insulated refrigeration grade
tube, (Cu DHP type according to ISO 1337), degreased and
deoxidized, suitable for operating pressures of at least 4200 kPa.
Under no circumstances use sanitary type copper pipe.
Note:
• Do not kink or flatten the tubes.
• Avoid bends with a bending radius of less than 100 mm.
• Do not bend copper tubes more than three times at the same point.
• Do not remove flare fittings from unit tubes before actually making
the connections.
• Do not fasten the insulation too tightly to the tubes with straps or
tape.
Flaring the end of the tubing
Remove protective caps from the copper tube ends.
Position tube end downward, cut the tube to the required length
and remove the burrs with a reamer.
Remove flare nuts from the unit connections and place them on
the tube end.
Flare the tube with a flaring tool.
Flare end must not have any burrs or imperfections.
The length of the flared walls must be uniform.
Finger-tighten the fitting several turns, then tighten it fully with two
wrenches by applying the tightening torque indicated in the table.
GB - 8
Tubing diameter
Liquid
(Discharge)
(inches) mm (inches)
(1/2") 6,35 (1/4")
(5/8") 9,52 (3/8")
Connection to the unit
Insufficient tightening torque will cause gas leaks.
Overtightening the fittings will damage the tube flaring and cause
gas leaks.
Adijustable wrench or
torque wrench
Connecting pipes
Unit connections
Tubing diameter
mm (inches)
6,35 (1/4")
9,52 (3/8")
12,70 (1/2")
15,87 (5/8")
Tube insulation
Fastening tape
Once all connections have been completed, check for leaks by
applying soapy water to them.
If incorrect connection or removal of the unit results in a
refrigerant gas leak, check the refrigerant charge as indicated
in the "OUTDOOR UNIT INSTALLATION MANUAL".
Finally wrap connections with anti-condensate insulation and
tighten with tape, without exerting great pressure on the
insulation.
Repair and cover any possible cracks in the insulation.
Connection pipes and electric cables between indoor and
outdoor units must be fixed to the wall with appropriate
conduits.
Check
Pour water into the condensate drain pan and check that it flows
freely to the drain.
Torque
Nm
18
42
55
65