Daikin VRV III REMQ72PBYD Engineering Data Download

Page: 104 / 130

Installation

EDUS391004-N

104

Installation of Outdoor Units

CAUTION

•

Be sure to use crimp-style terminal with insulating sleeves for
connections. (See the figure below.)

•

For wiring, use the designated power wire and connect firmly, then
secure to prevent outside pressure being exerted on the terminal
board.

•

Use an appropriate screwdriver for tightening the terminal screws.
A screwdriver with a small head will strip the head and make
proper tightening impossible.

•

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 24, 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 24).

(Refer to figure 24)

Retain with accessory clamp (3).

Electric conduit

When routing out the power/ground wires from the left
side.

When routing out the transmission wiring from the
opening for piping.

When routing out the power/ground wires from the front.

Clear over 2 in..

When routing out the transmission wiring from the
knockout hole.

Retain to the back of the column support with the
accessory clamp (2).

When routing out the power/ground wires from the right
side.

10.

Power wiring

11.

Transmission wiring

12.

Ground wire

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.

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 25, 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 25 are needed in

“11.

ADDITIONAL REFRIGERANT CHARGE AND CHECK
OPERATION”

(Refer to figure 25)

Gauge manifold

Nitrogen

Measuring device

R410A tank (with siphon)

Vacuum pump

Charge hose

Equalizer pipe shutoff valve

HP/LP gas pipe shutoff valve

Suction gas pipe shutoff valve