Air Tight Test And Vacuum Drying; Pipe Insulation - Daikin REYQ8PY1B Installation Manual

7. When routing out the transmission wiring from the
knockout hole.
8. When routing out the power/ground wires from the right side.
9. Power wiring
10. Ground wire
11. Transmission wiring
12. When wiring, exercise sufficient caution not to detach the
acoustic insulators from the compressor.
13. Secure to the back side of the support beam using the
accessory clamp (1).
14. Retain to the back of the column support with the acces-
sory clamp (2).
Note
• After wiring work is completed, check to make sure there are no loose
connections among the electrical parts in the EL.COMPO.BOX (1)
(right).
8.

AIR TIGHT TEST AND VACUUM DRYING

• After finished piping work, carry out air tight test and vacuum drying.
Note
• Always use nitrogen gas for the airtightness test.
• Absolutely do not open the shutoff valve until the main power ciruit
insulation measurement has been completed. (measuring after
the shutoff valve is opened will cause the insulation value to drop.)
<Needed tools>
• To prevent entry of any impurities and insure
sufficient pressure resistance, always use the
Gauge manifold
special tools dedicated for R410A.
Charge hose
• Use charge hose that have pushing stick for
valve
connecting to service port of shutoff valves or
refrigerant charge port.
• The vacuum pump for vacuum drying should
be able to lower the pressure to –100.7kPa
Vacuum pump (5 Torr –755mm Hg).
• Take care the pump oil never flow backward
into the refrigerant pipe during the pump stops.
<The system for air tight test and vacuum drying>
• Referring to figure 25, connect an nitrogen tank, refrigerant tank,
and a vacuum pump to the outdoor unit.
The refrigerant tank and the charge hose connection to refrigerant
charge port or the valve A in figure 25 are needed in "11. ADDI-
TIONAL REFRIGERANT CHARGE AND CHECK OPERATION".
(Refer to figure 25)
1. Gauge manifold
2. Nitrogen
3. Measuring device
4. R410A tank (with siphon)
5. Vacuum pump
6. Charge hose
7. Refrigerant charge port
8. HP/LP gas pipe shutoff valve
9. Suction gas pipe shutoff valve
10. Liquid pipe shutoff valve
11. Valve A
12. Valve B
13. Valve C
14. Outdoor unit
15. To BS (or indoor) unit
16. Shutoff valve
17. Service port
18. Field piping
19. Gas flow
Note
• The airtightness test and vacuum drying
should be done using the service ports of
HP/LP gas pipe, suction gas pipe and liquid
pipe shutoff valve.
See the [R410A] Label attached to the front
plate of the outdoor unit for details on the
location of the service port (see figure at right)
• See [Shutoff valve operation procedure] in
"11-1 Before working" for details on han-
dling the shutoff valve.
11
• The refrigerant charge port is connected to unit pipe.
When shipped, the unit contains the refrigerant, so use caution
when attaching the charge hose.
<Air tight test>
Pressurize the liquid pipe, suction gas pipe and HP/LP gas pipe from
the service ports of each shutoff valve to 4.0MPa (40bar) (do not
pressurize more than 4.0MPa (40bar)). If the pressure does not drop
within 24 hours, the system passes the test.
If there is a pressure drop, check for leaks, make repairs and perform
the airtight test again.
<Vacuum drying>
Evacuate the system from the liquid pipe, suction gas pipe and
HP/LP gas pipe shutoff valve service ports by using a vacuum
pump for more than 2 hours and bring the system to –100.7kPa or
less. After keeping the system under that condition for more than 1
hour, check if the vacuum gauge rises or not. If it rises, the system
may either contain moisture inside or have leaks.
Note
If moisture might enter the piping, follow belows.
(I.e., if doing work during the rainy season, if the actual work
takes long enough that condensation may form on the inside of
the pipes, if rain might enter the pipes during work, etc.)
(1) After performing the vacuum drying for two hours, pressurize to
0.05 MPa (i.e., vacuum breakdown) with nitrogen gas, then
depressurize down to –100.7 kPa for an hour using the vacuum
pump (vacuum drying).
(2) If the pressure does not reach –100.7 kPa even after depressur-
izing for at least two hours, repeat the vacuum breakdown - vac-
uum drying process.
After vacuum drying, maintain the vacuum for an hour and make sure
the pressure does not rise by monitoring with a vacuum gauge.
9.

PIPE INSULATION

• Insulation of pipes should be done after performing "8. AIR TIGHT
TEST AND VACUUM DRYING".
• Always insulate the liquid piping, the HP/LP gas piping, the suc-
tion gas piping, the gas piping and these pipe connections.
Failing to insulate the pipes may cause leaking or burns.
Especially, be sure to insulate the HP/LP gas piping as withstand-
ing as the suction pipe because the suction gas follows in the
HP/LP gas piping when the system is whole cooling mode.
And be sure to use the insulation which can withstand such tem-
peratures of 120°C or more for the HP/LP gas piping and the gas
piping because the high pressure gas follows in these pipings.
• Reinforce the insulation on the refrigerant piping according to the
installation environment. Condensation might form on the surface
of the insulation. Refer to the below.
Ambient temperature : 30°C, humidity : 75% to 80% RH : min.
thickness : 15mm.
If the ambient temperature exceeds 30°C and the humidity
80% RH, then the min. thickness is 20mm.
See the Engineering data book for detail.
• If there is a possibility that condensation on the shutoff valve
might drip down into the indoor unit through gaps in the insulation
and piping because the outdoor unit is located higher than the
indoor unit, etc., this must be prevented by caulking the connec-
tions, etc. (Refer to figure 26)
• The piping lead-out hole lid should be attached after opening a
knock hole. (Refer to figure 27)
• If small animals and the like might enter the unit through the pip-
ing lead-out hole, close the hole with blocking material (procured
on site) after completion of "11. ADDITIONAL REFRIGERANT
CHARGE AND CHECK OPERATION". (Refer to figure 30)
(Refer to figure 26)
1. Insulation material
2. Caulking, etc.
(Refer to figure 27)
1. Piping lead-out hole lid
2. Open a knock hole at "
3. Block "
Note
[R410A] Label
• After knocking out the holes, we recommend you remove burrs in
the knock holes (See figure 27) and paint the edges and areas
around the edges using the repair paint.
".
".
English