Procedure For Wiring Inside Units; Air Tight Test And Vacuum Drying - Daikin REYQ72TTJU Installation Manual

9 .6 . Procedure for Wiring Inside Units

• Referring to the figure below, secure and wire the power and trans-
mission 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 2 in. (51 mm) away from
the power wiring.
• Route wiring so that it does not come into contact with the high-
temperature pipes (indicated by the hatching in the figure below) or
the port pipes (see figure below).
REYQ72T
7
Hole
5
9
Note:
3
Do not allow the power wire
to come into contact with
the port pipe.
REYQ96-168T
7
8
5
9
Note:
3
Do not allow the power wire
to come into contact with
the port pipe.
1 Power/ground wires
2 Clear over 2 in. (50 mm)
3 Transmission wiring
4 Clamp (1) (accessory)
5 Clamp (2) (accessory)
NOTE
Do not touch the port pipes during wiring work. Damages of pipes may
cause refrigerant leak.
3P362438-3H English
8
3
4
1
6
1
2
1
3
4
1
6
Compressor wiring
1
2
1
6 Clamp (3) (accessory)
7 Power wiring
8 Ground wire
9 Port pipes
Precautions when knocking out knockout holes
• To punch out a knockout hole, hit it with a hammer.
• Open an appropriate hole as needed.
• After knocking out the holes, trim off the burr, then we recommend
you to paint the edges and areas around the edges using the repair
paint to prevent rusting.
• Power line: Open a knockout hole as shown at right and connect it
using a conduit.
Choose an appropriate knockout hole for conduit size suitable for
the power and ground line to be used.
• Transmission line: Connect it using a conduit in the knockout hole
on the left.
Knockout hole (Transmission line) f7/8 in. (22.2 mm)
Knockout hole (Power line)
Burr
NOTE
After wiring work is completed, check to make sure there are no loose
connections among the electrical parts in the control box.

10 . 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 air tightness test.
• Absolutely do not open the stop valve until the main power circuit
insulation measurement has been completed. (Measuring after the
stop valve is opened will cause the insulation value to drop.)
<Needed tools>
Gauge manifold
• To prevent entry of any impurities and insure
Charge hose
sufficient pressure resistance, always use the
valve
special tools dedicated for R410A.
• Use charge hose that have pushing stick for con-
necting to service port of stop valves or refriger-
ant charge port.
Vacuum pump
• The vacuum pump for vacuum drying should be
able to lower the pressure to 500 microns.
• Take care the pump oil never flow backward into
the refrigerant pipe during the pump stops.
<The system for airtight test and vacuum drying>
• Referring to the figure below, connect a 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 the figure below are needed in
14. Charging refrigerant on page 26.
f7/8 in. (22.2 mm)
f1-1/8 in. (27.8 mm)
f1-3/8 in. (34.5 mm)
22