Refrigerant Connections - Carrier 42 HWS 07 Installation Manual

42 HWS

Refrigerant connections

Refer to the outdoor unit installation manual for tube sizing,
and limitations (slopes, length, number of curves allowed,
refrigerant charge, etc.)
Gas
Mod. (Suction)
mm (inches)
07 10 (3/8")
09 10 (3/8")
12 12 (1/2")
18
12 (1/2")
24 16 (5/8")
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 3000 kPa. Under no circumstances use
sanitary type copper pipe.
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 the flaring tool.
Flare end must not have any burrs or imperfections.
The length of the flared walls must be uniform.
Lubricate the tube end and thread of the flare fitting with anti-freeze
oil. 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)
mm (inches)
6 (1/4")
6 (1/4")
6 (1/4")
6 (1/4")
6 (1/4")
Connection to the unit
Insufficient tightening torque will cause gas leaks. Overtightening
the fittings will damage the tube flaring and cause gas leaks.
Adjustable wrench or torque wrench
Outdoor end
Indoor end
Tubing diameter
mm (inches)
6 (1/4")
10 (3/8")
12 (1/2")
16 (5/8")
Tube
Tube insulation
Fastening tape
Once all connections have been completed, check for leaks by
applying soapy water to them. 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. If the system power supply is connected to the indoor unit
(only for models 07 - 09 and 12) the power supply cable must also
be fixed to the wall in the proper conduit.
Check
Pour water into the condensate drain pan and check that it flows
freely to the drain.
Torque
Nm
15 - 20
31 - 35
50 - 55
50 - 55