Installation manual
6
RRHQ+RRLQ006~008BAV3
Outdoor unit for air to water heat pump
4PW54244-1
Connecting the refrigerant piping to the outdoor unit
1
When connecting the flare nut, coat the flare inner surface with
ether oil or with ester oil and initially tighten 3 or 4 turns by hand
before tightening firmly.
2
When loosening a flare nut, always use two wrenches together.
When connecting the piping, always use a spanner and torque
wrench together to tighten the flare nut to prevent nut cracking
and leaks.
Refrigerant piping work
Pipe handling guidelines
■
Protect the open end of the pipe against dust and moisture.
■
All pipe bends should be as gentle as possible. Use a pipe
bender for bending.
Bending radius should be 30 to 40 mm or larger.
Selection of copper and heat insulation materials
When using commercial copper pipes and fittings, observe the
following:
■
Insulation material: polyethylene foam
Heat transfer rate: 0.041 to 0.052 W/mK (0.035 to 0.045
kcal/mh°C)
Refrigerant gas pipe's surface temperature reaches 110°C max.
Choose heat insulation materials that will withstand this
temperature.
■
Be sure to insulate both the gas and liquid piping and to provide
insulation dimensions as below.
■
Use separate thermal insulation pipes for gas and liquid
refrigerant pipes.
Purging air and checking gas leakage
When all piping work is completed and the outdoor unit is connected
to the indoor unit, it is necessary to purge the air and check for gas
leakage.
■
If using additional refrigerant, perform air purging from the
refrigerant pipes and indoor unit using a vacuum pump, then
charge additional refrigerant.
■
Use a hexagonal wrench (4 mm) to operate the stop valve rod.
All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and
national regulations.
CAUTION
■
Do not use mineral oil on flared part.
Mineral oil getting into the system would reduce the
lifetime of the units.
■
Never use piping which has been used for previous
installations. Only use parts which are delivered with
the unit.
■
Do never install a drier to this R410A unit in order to
guarantee its lifetime. The drying material may
dissolve and damage the system.
■
Incomplete flaring may cause refrigerant gas leakage.
Flare nut
Flare nut tightening torque
Ø6.4 mm (1/4")
15~17 N•m
Ø15.9 mm (5/8")
63~75 N•m
Valve cap tightening torque
Valve cap
Gas pipe
Ø6.4 mm (1/4")
21.6~27.4 N•m
Ø15.9 mm (5/8")
44.1~53.9 N•m
Service port cap tightening torque
10.8~14.7 N•m
1
2
3
4
1
Torque wrench
2
Spanner
3
Piping union
4
Flare nut
Pipe size
Pipe insulation
Outer
diameter
Thickness
Inner diameter
Thickness
6.4 mm (1/4")
0.8 mm
8-10 mm
≥
10 mm
15.9 mm (5/8")
1.0 mm
16-20 mm
≥
13 mm
WARNING
■
Do not mix any substance other than the specified
refrigerant (R410A) into the refrigeration cycle.
■
When refrigerant gas leaks occur, ventilate the room
as soon and as much as possible.
■
R410A, as well as other refrigerants, should always
be recovered and never be released directly into the
environment.
CAUTION
Use a vacuum pump for R410A exclusively. Using the
same vacuum pump for different refrigerants may damage
the vacuum pump or the unit.
5
6
1
2
4
3
1
Gas pipe
2
Inter-unit wiring
3
Liquid pipe
4
Liquid pipe insulation
5
Finishing tape
6
Gas pipe insulation
1D_IM_4PW54244-1.book Page 6 Friday, October 30, 2009 8:20 AM
