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4. Connect gas side branch pipe (1) to the main gas pipe. The main
gas pipe is field-supplied.
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1
2 3
1 Gas side branch pipe (1)
2 Main gas pipe (field supply)
3 Brazing
5. Connect liquid side accessory pipes (2) to the liquid side shutoff
valves. Liquid side accessory pipes (2) are supplied with the
outdoor units.
1
4
2
3
1 Liquid side shutoff valve
2 Liquid side accessory pipe (2)
3 Branch pipe (field supply)
4 Brazing
CAUTION
• Check that the on-site piping does not come in contact with other
piping, the bottom frame, or side plate of the product.
Field installation items
CAUTION
• This product requires that a dryer and a sight glass be installed on
liquid piping on site. (Operating the unit without a dryer installed
may result in equipment failure.)
• Only install the dryer and the sight glass after the other field piping
has been installed .
• Operating the units without a sight glass installed makes it
impossible to check the state of the refrigerant.
• When brazing, make sure there are no flammable materials
around.
LREQ15+20B7Y1R
Air cooled refrigeration condensing unit
4P360438-1B – 2014.01
A
A
Dryer installation
Select a dryer from the following chart:
Model
Required dryer core (recommended type)
LREQ15-20
550 g (100% molecular sieve equivalent)
(48-DM: Danfoss made)
• Install the dryer in a horizontal orientation wherever possible.
• Install the dryer as close to the outdoor unit as possible.
• Remove the dryer cap immediately before brazing (to prevent
absorption of airborne moisture).
• Follow instructions in the dryer instruction manual concerning dryer
brazing.
• Repair any burning of dryer paint that occurs during dryer
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.
• Install the dryer on the main liquid pipe.
Sight glass installation
• The sight glass is supplied with the outdoor unit
mult-connection piping kit.
• Install the sight glass between the dryer and the indoor unit, as
close to the outdoor unit as possible.
• Make sure the sight glass is comfortably accessible.
• Install the sight glass on the main liquid pipe.
• During brazing, use a wet cloth to cool down the glass portion of
the sight glass.
a
a Sight glass
b Dryer
Precautions for Piping
Perform piping branching with the following conditions kept in mind.
• At the time of branching the liquid piping, use a T-joint or Y-joint
and branch it horizontally. This will prevent an uneven flow of
refrigerant.
• At the time of branching gas piping, use a T-joint and branch it so
that the branched piping will be located above the main piping (see
the illustration below). This will prevent the stay of refrigerant oil in
the indoor unit not in operation.
• Use a Y-joint for the liquid refrigerant branch and have the piping
branch horizontally.
Y-joint
A
b
Horizontal
surface
±30° or less
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Installation manual
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