Loading ...
Loading ...
Loading ...
17
EE
EN
11. Refrigerant piping work
Forconstraintsonpipinglengthandallowabledierenceof
elevation, refer to the design section of the engineering manual.
Themethodofpipeconnectionontheairhandlerisare
connection.
Provide proper bracing for refrigerant piping so no load is imparted
upon the connections at the air handler.
Warning:
When installing and moving the unit, do not charge it with
refrigerantotherthantherefrigerantspeci�edontheunit.
Mixingofadierentrefrigerant,air,etc.maycausethe
refrigerant cycle to malfunction and result in severe
damage.
Caution:
Use refrigerant piping made of C1220 (Cu-DHP)
phosphorousdeoxidizedcopperasspeci�edinASTM
B280 Standard for copper and copper alloy seamless
pipes and tubes. In addition, be sure that the inner
and outer surfaces of the pipes are clean and free of
hazardous sulphur, oxides, dust/dirt, shaving particles, oils,
moisture, or any other contaminant.
Never use existing refrigerant piping.
Caution: COIL UNDER PRESSURE
Always wear safety glasses when working around
pressurized devices.
The air handlers are shipped with a nitrogen holding
charge in the coil. Carefully follow these instructions when
releasing the charge.
Carefullyremovethearenutotheendofthepipetoreleaseany
gas.
Both refrigerant lines need to be insulated all the way up to
the cabinet. Make sure the openings in the cabinet around the
refrigerant lines are sealed. 3/8 in thick insulation is the minimum
recommended thickness. Based on ambient conditions, local codes
and line length, thicker insulation may be desired.
Donotputanyoilonthethreadedportionofthearenuts.This
maycausethearenuttoloosenandleakrefrigerant.
Pipe
diameter
inch (mm)
Nut
(mm)
A inch
(mm)
Tightening torque
Clutch
type
tool for
R410A
N•m
lb•ft
(kgf•cm)
1/4 (6.35) (17)
0 to 0.02
(0 to 0.5)
13.7 to 17.7
10 to 13
(140 to 180)
3/8 (9.52) (22) 34.3 to 41.2
25 to 30
(350 to 420)
1/2 (12.7) (26) 49.0 to 56.4
36 to 42
(500 to 575)
5/8 (15.88) (29) 73.5 to 78.4
54 to 58
(750 to 800)
-Never use existing refrigerant piping.
-The large amount of chlorine in conventional refrigerant and
refrigerant oil in the existing piping will cause the new refrigerator to
deteriorate.
-Store the piping to be used during the installation indoors and keep
both ends of the piping sealed until just before brazing.
-If dust, dirt or water gets into the refrigerant cycle, the oil will
deteriorate and the compressor may fail.
-Use ester oil, ether oil or alkylbenzene (small amount) as the
refrigerantoiltocoataresandangeconnectionsbefore
connecting.
-The refrigerant used in the unit is highly hydroscopic and mixes
with water which will degrade the refrigerant oil.
Loading ...
Loading ...
Loading ...