Carrier ClassiCool 53KDMT12N-718 - Page 60

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CONNECTING REFRIGERANT PIPING
18-10 STEPS OF CONNECTING REFRIGERANT PIPING LINES TO INDOOR UNIT
Connecting
suction
and liquid piping
lines respectively with
suction and
liquid half unions of indoor unit.
A. Lubricate flare nuts of suction and liquid
piping line end and the threads of the
suction
and liquid
half unions of indoor unit with anti
– freeze oil.
This is effective for reducing refrigerant
leaks.
B. For proper connection, align the centers of
suction
union pipe and flare pipe straight with
each other, then finger tighten several tu
rns
the flare nut tightly at first to obtain a smooth
match.
C. Then hold the union side with a double-ended
wrench and tighten the flare nut by applying
the tightening torque indicated in the table.
Be careful not to damage the flare nut
threads.
NOTES
a. Insufficient tightening torque
will cause refrigerant leaks.
b. Over tightening the torque will
damage the tube flaring and
cause refrigerant leaks.
18-11 STEPS OF CONNECTING REFRIGERANT PIPING LINES TO OUTDOOR UNIT
x Connecting the other ends of suction
and liquid piping lines respectively
with suction and liquid flare valves of
the outdoor unit.
x Repeat steps (A), (B), (C) when
connecting refrigerant piping lines to
the flare valve of the outdoor unit.
Lubricate
(1)
Fingers tighten
several turns the
flare nuts tightly of
first to obtain a
smooth match
Flare Spanner or
Torque Wrench
Indoor
Side
(2)
Tighten flare nuts
with adjustable
wrench or torque
wrench.
Indoor Unit
Piping
Refrigerant
Piping Lines
Indoor unit tubing
Piping Line
Flare Nut
Refrigerant
Piping Lines
Flare Nut
Tightening Torque
inch
Mm
N.M
Kgf - cm
1/4”
6.35
15-20
150-200
3/8”
9.52
31-35
310-350
1/2”
12.7
50-55
500-550
5/8”
15.88
70.76
700.760
3/4”
19.05
70.76
700-760
7/8"
22.22
70-76
700-760
Indoor Unit
Tightening Torque