ERLQ018~030BAVJU
Outdoor unit for air to water heat pump
4PW62590-1 – 07.2010
Installation manual
8
■
Do not use flux when brazing copper-to-copper refrigerant
piping. Use phosphor copper brazing filler alloy (BCuP) which
does not require flux.
■
Flux has an extremely harmful influence on refrigerant piping
systems. For instance, if chlorine based flux is used, it will cause
pipe corrosion or, in particular, if the flux contains fluorine, it will
deteriorate the refrigerant oil.
9.2.
Guidelines for flare connection
■
Flares should not be re-used. New ones should be made in
order to prevent leaks.
■
Use a pipe cutter and annealed flare tool suitable for the
refrigerant used.
■
Only use the annealed flare nuts included with the unit. Using
different flare nuts may cause the refrigerant to leak.
■
Please refer to the table for flaring dimensions and tightening
torques (too much tightening will result in splitting the flare).
■
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.
■
After all piping has been connected, use nitrogen to perform a
gas leak check.
■
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 flare nut
cracking and leaks.
■
After the work is finished, make sure to check that there is no
gas leak.
9.3.
Guidelines for handling the stop valve
Cautions for handling the stop valve
■
Make sure to keep both stop valves open during operation.
■
The figure below shows the name of each part required in
handling the stop valve.
■
The stop valve is factory closed.
■
Do not apply excessive force to the stop valve. Doing so may
break the valve body.
Since the stop valve mounting plate may be deformed if only a
torque wrench is used to loosen or tighten the flare nut, always
make sure to secure the stop valve with a spanner, then loosen
or tighten the flare nut with a torque wrench.
Do not place the spanner on the stop valve cover, as this could
cause a refrigerant leak.
■
The operating pressure at the refrigerant side can be low,
sufficiently seal the flare nut in the stop valve on the gas line with
silicon sealant to prevent freezing.
How to use the stop valve
■
Opening the stop valve
1.
Remove the stop valve cover.
2.
Insert a hexagon wrench (0.15 inch [close to 5/32 inch] (4 mm))
into the stop valve and turn the stop valve counter clockwise.
3.
When the stop valve cannot be turned any further, stop turning.
The valve is now open.
■
Closing the stop valve
1.
Remove the stop valve cover.
2.
Insert a hexagon wrench (0.15 inch [close to 5/32 inch] (4 mm))
into the stop valve and turn the stop valve clockwise.
3.
When the stop valve cannot be turned any further, stop turning.
The valve is now closed.
CAUTION
■
Do not use mineral oil on flared part.
Mineral oil getting into the system would reduce the
lifetime of the units.
■
Incomplete flaring may cause refrigerant gas leakage.
Piping size
Tightening
torque
Flare
dimensions A
Flare shape
(mm)
1/4 inch
(Ø6.4 mm)
11.06~12.54 lbs•ft
(15~17 N•m)
0.34~0.36 inch
(8.7~9.1 mm)
5/8 inch
(Ø15.9 mm)
46.47~55.32 lbs•ft
(63~75 N•m)
0.76~0.78 inch
(19.3~19.7 mm)
R=0.02~0.04 inch
(=0.4~0.8 mm)
45
±
2
90
±
2
A
2
3
1
4
1
Torque wrench
2
Spanner
3
Piping union
4
Flare nut
1
Spanner
2
Torque wrench
Silicon sealant
(Make sure there is no gap)
Closing direction
Liquid side
Gas side
1
Service port and service port cover
2
Stop valve
3
Field piping connection
4
Stop valve cover
3
4
1
2
1
2
4PW62590-1.book Page 8 Wednesday, June 30, 2010 12:17 PM
