Daikin VRV III REMQ72PBYD, Engineering Data

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EDUS391004-N Installation
Installation of Outdoor Units 81
• Over-tightening the terminal screws may break them.
See the following table for the tightening torque of the terminal
screws.
• When pulling the ground wire out, wire it so that it comes through
the cut out section of the cup washer. (See the figure below.) An
improper ground connection may prevent a good ground from
being achieved.
• When two wires are connected to a single terminal, connect them
so that the rear sides of the crimp contacts face each other. Also,
make sure the thinner wire is on top, securing the two wires
simultaneously to the resin hook using the included clamp (1).
7-6 Procedure for Wiring Inside Units
• Referring to figure 23, secure and wire the power and transmission
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. away from the power
wiring.
• Make sure all wiring do not contact to the pipes (hatching parts in
the figure 23).
(Refer to figure 23)
1. Secure to the hook of column support using the
accessory clamp (1).
2. Electric conduit
3. When routing out the power/ground wires from the left
side.
4. When routing out the transmission wiring from the
opening for piping.
5. When routing out the power/ground wires from the front.
6. Clear over 2 in..
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
accessory clamp (2).
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 left and connect
it using a conduit.
• Transmission line : Connect it using a conduit in the knockout
hole on the right.
NOTE
• After wiring work is completed, check to make sure there are no
loose connections among the electrical parts in the electrical
components 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 air tight test.
• Absolutely do not open the shutoff valve until the main power
circuit insulation measurement has been completed. (measuring
after the shutoff valve is opened will cause the insulation value to
drop.)
<Needed tools>
<The system for air tight test and vacuum drying>
• Referring to figure 24, 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 figure 24 are needed in
“11.
ADDITIONAL REFRIGERANT CHARGE AND CHECK
OPERATION”
.
(Refer to figure 24)
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 Branch Selector (or indoor) unit
16. Shutoff valve
17. Service port
18. Field piping
19. Gas flow
Screw size Tightening torque (ft · lbf)
M8 Power terminal, ground terminal 4.06 ~ 5.38
Crimp-style terminal
Cup washer
Cut out section
Terminal
block Crip style
terminal
Wire : narrow
Wire : thick
Resin hook
Gauge manifold
Charge hose
valve
• To prevent entry of any impurities and insure
sufficient pressure resistance, always use the
special tools dedicated for R410A.
• Use charge hose that have pushing stick for
connecting to service port of shutoff valves or
refrigerant charge port.
Vacuum pump
• The vacuum pump for vacuum drying should be
able to lower the pressure to –14.6 psi.
• Take care the pump oil never flow backward into
the refrigerant pipe during the pump stops.
Burr
Knockout hole
Left side Right side
Conduit
(field supply)
Lock nut
(field supply)
Conduit mounting plate
(accessory)
3P215731-12R