Daikin LRYEQ-AY - Инструкция по эксплуатации - Страница 11

LRYEQ16A7Y1

CONVENI-PACK

4P448939-1A – 2016.07

Installation manual

8

6-2 Selection of Refrigerant Branching

When selecting refrigerant branching, follow the rules outlined below.

Allowed refrigerant branch kits

A:  Choose the refnet joint so that incoming and outgoing piping diam-
eters (refer to 6-1 Selection of Piping Material and Size) matches with 
one of the available diameters of the refnet joint.
B: Do not connect 2 or more headers in series. For the gas side 
choose the refnet header so that the diameter of the header is equal to 
the main piping diameter or equal to one size-up of the main piping 
diameter.

6-3 Protection Against Contamination when 

Installing Pipes

Protect the piping to prevent moisture, dirt, dust, etc. from entering the 
piping.

Note

Exercise special caution to prevent dirt or dust when passing piping 
through holes in walls and when passing pipe edges to the exterior.

6-4 Pipe Connection

• Be sure to perform nitrogen permutation or nitrogen blow when brazing.

Brazing without performing nitrogen permutation or nitrogen blow 
into the piping will create large quantities of oxidized film on the 
inside of the pipes, adversely affecting valves and compressors in 
the refrigerating system and preventing normal operation.

• The pressure regulator for the nitrogen released when doing the 

brazing should be set to 0.02 MPa (about 0.2kg/cm

2

:Enough to feel 

a slight breeze on your cheek).

Note

Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.

6-5 Drier Installation

CAUTION

This product requires that a drier be installed on liquid piping on site.
(Operating the unit without a drier installed may result in equipment 
failure.)

Select a drier from the following chart:

• Connect the drier to liquid pipe on the refrigeration side.
• Install the drier in a horizontal orientation wherever possible.
• Install the drier as close to the outdoor unit as possible.
• Remove the drier cap immediately before brazing (to prevent 

absorption of airborne moisture).

• Follow instructions in the drier instruction manual concerning drier 

brazing.

• Repair any burning of drier paint that occurs during drier brazing. 

Contact the manufacturer for more information about paint for 
repair use.

• Flow direction is specified for some type of the dryer.

Set the flow direction according to the operation manual of the 
dryer. (Liquid refrigerant flows from the outdoor unit to the indoor 
unit.)

6-6 Connecting the Refrigerant Piping

CAUTION

• In addition to gas and liquid shutoff valves, this unit has a mainte-

nance shutoff valve (see diagram below).

• Do not operate the maintenance shutoff valve*.

(The factory setting for the maintenance shutoff valve is "open." 
During operation, always leave this valve in the open position. 
Operating the unit with the valve in the closed position may cause 
the compressor to fail.)

Allowed

Not allowed

Refriger-
ant side

Refnet joints and 

headers

(a)

T-joints

(a) For allowed Daikin refrigerant branch kits, see table below.

—

Air condi-
tioning 
side

Refnet joints and head-

ers

(a)

T-joints

Refnet joint

KHRQ22M20T

KHRQ22M29T9

KHRQM64T

KHRQ22M75T

A

Refnet header

(a)

(a) Maximum 8 branches can be connected to a header.

KHRQ22M29H
KHRQ22M64H
KHRQ22M75H

B

Place

Installation period

Protection method

Outdoor

More than a month

Pinch the pipe

Less than a month

Pinch or tape the pipe

Indoor

Regardless of the period

Refrigerant pipe

Regulator

Handy valve

Taping

Nitrogen

Nitrogen

Location to 
be brazed

Model

Required dryer core 

(recommended type)

LRYEQ16A7Y1

160g (100% molecular sieve equivalent)
(DML164/DML164S : Danfoss made)

Liquid side shutoff valve 
(provided with service port)

Gas side shutoff valve 
(provided with service port)

* Maintenance shutoff valve

* Maintenance shutoff valve

4PEN448939-1A.book  Page 8  Monday, September 5, 2016  7:12 PM