Evacuating - Daikin RP200B8W1 Installation Manual

NOTE Refer to the table for stop valve tightening
torques.
Be sure to use both a spanner and a torque
wrench when connecting or disconnecting pipes
to or from the unit.
Use a charging hose with push rod when using
the service port (5).
Check for refrigerant gas leakage after tightening
the cap.
Make sure to keep the valve open during
operation.
Service port (5)
Liquid pipe
Valve cap (1)
Gas pipe
Precautions for connecting pipes
When the outdoor unit is installed above the indoor unit the following
can occur:
1. The condensated water on the stop valve can move to the indoor
unit. To avoid this, please cover the stop valve with sealing material.
2. If the temperature is higher than 30°C and the humidity is higher than
RH 80%, then the thickness of the sealing materials should be at
least 20mm in order to avoid condensation on the surface of the
sealing.
Please refer to the table for the dimensions for processing flares
and for the tightening torques. (Too much tightening will end up
in splitting of the flare.)
Flare nut tightening
Piping size torque
32.7~39.9 N•m
Ø9.5
(333~407 kgf•cm)
49.5~60.3 N•m
Ø12.7
(504~616 kgf•cm)
61.8~75.4 N•m
Ø15.9
(630~770 kgf•cm)
97.2~118.6 N•m
Ø19.1
(989.8~1208 kgf•cm)
When connecting the flare nut, coat the flare both inside and
outside with refrigerating ether or ester oil and initially tighten by
hand 3 or 4 turns before tightening firmly.
Coat here with ether oil or ester oil
Make sure to flow nitrogen gas through the pipe when brazing.
Take measures against contamination when installing pipes.
Prevent foreign materials like moisture and other impurities from
mixing into the system.
Place Installation period
More than a month
Outdoor unit
Less than a month
Regardless of the
Indoor
Great caution is needed when passing copper tubes through walls.
Installation manual
4
Stop valve tightening torques
R(Y)P200 R(Y)P250
9.8~14.7 N•m (100~150 kgf•cm)
19.6~24.5 N•m 29.4~34.3 N•m
(200~250 kgf•cm) (300~350 kgf•cm)
39.2~44.1 N•m (400~450 kgf•cm)
A dimensions for
processing flares (mm ) Flare shape
12.0~12.4
90° ±2
15.4~15.8
A
18.6~19.0
22.9~23.3
Protection method
Pinch the pipe
Pinch or tape the pipe
period
In case of simultaneous operation system
Upward and downward piping should be performed at the main
piping line.
Use branch piping kit (optional) for branching refrigerant pipes.
Precautions to be taken. (For details, refer to the manual
attached to branch piping kit.)
- Install the branch pipes horizontally (Maximum inclination:
20 degrees or less)
- Length of branch pipe to the indoor unit should be as short as
possible.
- Try to keep lengths of both branch pipes to the indoor unit
equal.
E
VACUATING
The units were checked for leaks by the manufacturer.
The refrigerant lines fitted in site are to be checked for leaks by the
fitter.
Confirm that the valves are firmly closed before pressure test or
vacuuming.
Do not purge the air with refrigerants. Use a vacuum pump
to vacuum the installation. No additional refrigerant is
provided for air purging.
Air tight test and vacuum drying: refer to
A Pair system
B Simultaneous operation system
1 Pressure gauge
2 Nitrogen
3 Refrigerant
4 Weighing machine
5 Vacuum pump
6 Stop valve
7 Main pipe
8 Branched pipes
9 Pipe branching kit (optional)
R=0.4~0.8
Air tight test: make sure to use nitrogen gas. Pressurize the
liquid and gas pipes to 3.3 MPa (do not pressurize more than
3.3 MPa). If the pressure drops, check where the nitrogen
comes from.
Vacuum drying: use a vacuum pump which can evacuate to
–100.7 kPa (5 Torr, –755 mm Hg).
• Evacuate the system from the liquid and gas pipes by using a
vacuum pump for more than 2 hours and bring the system to
–100.7 kPa. After keeping the system under that condition for
more than one hour, check if the vacuum gauge rises or not.
If it rises, the system may either contain moisture inside or
have leaks.
• Following should be executed if there is a possibility of moisture
remaining in the pipe (if piping work is carried out during the
raining season or over a long period of time, rainwater may enter
the pipe during work).
After evacuating the system for 2 hours, pressurize the system to
0.05 MPa (vacuum break) with nitrogen gas and evacuate the
system again using the vacuum pump for 1 hour to –100.7 kPa
(vacuum drying). If the system cannot be evacuated to –100.7 kPa
within 2 hours, repeat the operation of vacuum break and vacuum
drying.
Then after leaving the system in vacuum for 1 hour, confirm that
the vacuum gauge does not rise.
figure 8
R(Y)P200+250B8W1
Split System air conditioners
4PW23688-1B