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.
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).
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
6-5 Drier Installation
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
• 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- j o i n t s
(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
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