Procedure For Wiring Inside Units; Air Tight Test And Vacuum Drying; Pipe Insulation; Figure - Daikin REYQ18PY1 Installation Manual

7-6 Procedure for Wiring Inside Units

• Referring to figure 27, secure and wire the power and transmis-
sion wiring using the included clamp (1), (2), and (3).
• Wire so that the ground wiring does not come into contact with the
compressor lead wiring.
If they touch, this may have an adverse effect on other devices.
• The transmission wiring must be at least 50 mm away from the
power wiring.
• Make sure all wiring do not contact to the pipes (hatching parts in
the figure 24).
(Refer to figure 24)
1. Retain with accessory clamp (3).
2. Electric conduit
3. When routing out the power/ground wires from the left side.
4. When routing out the transmission wiring from the open-
ing for piping.
5. When routing out the power/ground wires from the front.
6. Clear over 50 mm.
7. When routing out the transmission wiring from the
knockout hole.
8. Retain to the back of the column support with the acces-
sory clamp (2).
9. When routing out the power/ground wires from the right side.
10. Power wiring
11. Transmission wiring
12. Ground wire
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).
15. When wiring, exercise sufficient caution not to detach the
acoustic insulators from the compressor.
Note
• After wiring work is completed, check to make sure there are no
loose connections among the electrical parts in the
EL.COMPO.BOX.
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. Equalizer pipe shutoff valve
8. HP/LP gas pipe shutoff valve
9. Suction gas pipe shutoff valve
10. Liquid pipe shutoff valve
11. Refrigerant charge port
12. Valve A
English
13. Valve B
14. Valve C
15. Outdoor unit
16. To BS (or indoor) unit
17. Shutoff valve
18. Service port
19. Field piping
20. Gas flow
Note
• The airtightness test and vacuum drying
should be done using the service ports of
equalizer pipe, 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.
• 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, HP/LP gas pipe and
equalizer pipe from the service ports of each shutoff valve to 4.0MPa
(40bar) (do not pressurize more than 4.0MPa (40bar)). If the pres-
sure 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, HP/LP
gas pipe and equalizer 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 gas
piping, the equalizer pipe (between the outdoor units for the out-
door multi system) 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, the equal-
izer pipe and the gas piping because the HP/LP 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.
[R410A] Label
12