Daikin RXYMQ36MVJU Instruction Manual download pdf (Page 19)

Installation EDUS39-606A-N

18 Installation of Outdoor Units

1. Make sure the pump oil does not flow oppositely into the

system while the pump is not working.

2. Use a vacuum pump which can evacuate to –14.6 psi.

Selection of piping material

1. Foreign materials inside pipes (including oils for fabrica-

tion) must not exceed 9 mg per 10 feet or less.

2. Use the following material specification for refrigerant pip-

ping:

• Construction material: Phosphoric acid deoxidized

seamless copper for refrigerant.

• Size: Determine the proper size referring to Section 6-

6, Example of Connection.

3. Make sure to use the refrigerant branching kit designated

in Section 6-6, Example of Connection.

• Use this guide to perform the piping installation within

the range of the maximum allowable pipe length, allow

able level difference, and allowable length after branch-

ing.

• For installation of the refrigerant branching kit, refer to

the installation manual attached to the kit.

Install the REFNET joint so that the pipings are branched

horizontally or vertically.

Or vertically

(Horizontal line)

(View A)

Within ± 30°



Mount the REFNET header so that it branches horizontally.



(Horizontal line)

(View B)

PROTECTION OF PIPING:

• Protect piping to prevent moisture and dust from entering,

especially when passing pipes through a hole or connect

ing the end pipe that extends outside.

• Especially, pay attention when passing the pipings through

a hole or connecting the end of piping to the outdoor.

Piping connection

• For handling of stop valves, refer to Stop valve operation

method in Section 6-7, Airtight test and vacuum drying.

• Only use the flare nuts attached to the stop valves.

Using different flare nuts may cause the refrigerant to leak.

• Be sure to perform a nitrogen blow when brazing.

Brazing without performing nitrogen replacement or releasing

nitrogen into the piping will create large quantities of oxidized

film inside the pipes, adversely affecting valves and compres

sor in the refrigerating system and preventing normal opera-

tion.

DANGER

• Use of oxygen could cause an explosion resulting in severe

injury or death. Only use nitrogen gas.

• Refrigerant gas may produce toxic gas if it comes in contact

with fire such as from a fan heater, stove, or cooking device.

Exposure to this gas can cause severe injury or death.

• When brazing with blowing nitrogen, set the nitrogen

pressure to 2.9 psi or less by using a pressure reduc

ing valve.

Location to

be brazed

Taping

Refrigerant

piping

Nitrogen

Regulator

Manual valve

Nitrogen

• Do not use anti-oxidants when brazing. Residue can clog

pipes and break the unit.

• Do not let any refrigerant other than the specified

refrigerant enter the refrigerant system.

• Do not let any gas, such as air, enter the refrigerant

system.

Precautions when connecting the pipings:

• See the following table for flare dimensions.

• When connecting the flare nuts, apply refrigerant oil to

the inside and outside of the flares and turn them three

or four times at first.

(Use ester oil or ether oil.)

• See the following table for tightening torque. Applying

too much torque may cause the flares to crack.

• After connecting all the pipings, perform a gas leak

check by using nitrogen.

Refrigerant oil

• If you must install the unit without a torque wrench,

use the following instructions:

• When you keep on tightening the flare nut with a span-

ner, there is a point where the tightening torque sud-

denly increases.

Location Working period Protection method

Outdoor

1 month or more Pinch pipes

Less than 1 month

Pinch or tape pipes

Indoor Regardless of period

Pipe size

Tightening

torque

ft·lbf

Flare dimension A

(in.) Flare shape (in.)

φ3/8”

(9.5mm)

24.1’-29.4’

(7.35 – 8.96

0.504 - 0.520

(12.80-13.21mm)

φ5/8”

(15.88mm)

45.6’-55.6’

(13.90 --

16.95m)

0.760 - 0.776

(19.30-19.71mm)

± 2

90°± 2°

R0.016

~0.031

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Daikin RXYMQ36MVJU Instruction Manual Page 19

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