Installation Of The Outdoor Unit; Refrigerant Piping - McQuay CEX20E Installation Manual

1. Piping Length & Elevation
Figure O
Outdoor Unit
• If the piping length is too long, both the capacity and reliability of the unit will decrease.
• As the number of bends increases, resistance of the piping system to the refrigerant flow increases and thus lowering the
capacity.
• As a result, the compressor may become defective. See Figure O and Figure P.
• Therefore, always select the shortest path for the piping system and follow the recommendations as tabulated in the table.
Indoor
Model
Outdoor
Maximum length, m (ft)
Maximum elevation, m (ft)
Maximum no. of bends
Liquid pipe size
Gas pipe size
Cutting Copper Tube
1/4t
Remove Burr
Copper Tube
Swaging Block

INSTALLATION OF THE OUTDOOR UNIT

REFRIGERANT PIPING

Indoor Unit
CEX20E CEX25E 5CEX15ER 5CEX20ER 5CEX25ER
SLV20B SLV25B 5SLX15CR 5SLX20CR 5SLX25CR
15 15
(49.2) (49.2)
8 8
(26.2) (26.2)
10 10
1/4" 3/8"
5/8" 5/8"
2. Piping Work
• Do not use contaminated or damaged copper tubing. Do not remove plastic,
rubber plugs and brass nuts from the valves, fittings, tubings and coils until
you are ready to connect suction or liquid line into valves or fittings.
• If any brazing work is required, ensure that the nitrogen gas is passed
through coil and joints while the brazing work is being done. This will
eliminate soot formation on the inside walls of the copper tubings.
• Cut the connection pipe with a pipe cutter.
• Remove burrs from cut edges of the pipes with remover. Hold the end of the
pipe downwards to prevent metal chips from entering the pipe.
• Insert the flare nuts, mounted on the connection parts of both the indoor unit
and outdoor unit onto the copper pipes.
• Flare the pipe with extra length above the flaring tool as shown in the table.
• The flared edge must be even and not cracked or scratched.
Ø Tube, D
Inch
1/4"
3/8"
1/2"
5/8"
3/4"
The outdoor unit must be installed in such a way, so as to
prevent short circuit of the hot discharged air or obstruction to
the smooth air flow. Please follow the installation clearances
shown in the figure. Select the coolest possible place where
intake air temperature is not greater than the outside air
temperature (max 45°C).
Dimension A
Minimum Distance, 300
mm (in) (11.8)
Note: If there is any obstacle higher than 2m, or if there is any
obstruction at the upper part of the unit, please allow more
space than the figure indicated in the above table.
Figure P
Outdoor Unit
12 15
(39.4) (49.2)
5 8
(16.4) (26.2)
10 10
1/4" 1/4"
1/2" 1/2"
mm Imperial
6.35 1.3
9.52 1.6
12.70 1.9
15.88 2.2
19.05 2.5
5
B C
1000 300
(39.4) (11.8)
Indoor Unit
15
(49.2)
8
(26.2)
10
1/4"
5/8"
A (mm)
Rigid
0.7
1.0
1.3
1.7
2.0