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5. REFRIGERANT PIPING
Maximum Pipe Length And Maximum No. Of Bends
When the pipe length becomes too long, both the capacity and reliability will drop and as the no. of bends increases,
system piping resistance to the refrigerant flow increases, thus lowering the capacity. As a result the compressor
may fail. Always choose the shortest path and follow the recommendations as tabulated below:-
Field piping
To ensure satisfactory operation and performance, the following points should be noted for the field piping
arrangements of the complete refrigerant cycle.
a) Liquid loops or oil traps must be provided according to the position of the outdoor and the indoor units
(depending on whether the indoor unit is above or below the outdoor unit)
Always choose the shortest piping path and follow the recommendations as shown below:
Max. Total Length,
Accumulator
m (ft.)
Model
Max. Elevation,
Liquid
Max. of
m (ft.)
With
holding
Bends
Accumulator
capacity (ltr.)
RZR200AY16
40 (131.2)
4.8
RZR300AY16
20 (65.6)
40 (131.2)
5.27
8
RZR400AY16
40 (131.2)
8.4
Caution:
1. Our guarantee on performance of our air-conditioners is strictly revoked if the height, length and/or the number
of bends of the refrigerant piping system installed is beyond the limit above.
2. Bendings must be carefully made so as not to crush the pipe. Use a pipe bender to bend a pipe as far as
possible.
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Field Connection pipe size detail
Indoor
Liquid Pipe
FDKR200AV16
1/2"
FDKR300AV16
1/2"
FDKR400AV16
5/8"
Precautions on refrigerant piping
INDOOR UNIT
----c=ra
Gas Pipe
Outdoor
Liquid Pipe
Gas Pipe
7/8"
RZR200AY16
1/2"
7/8"
1-1/8"
RZR300AY16
1/2"
1-1/8"
1-1/8"
RZR400AY16
5/8"
1-1/8"
i. Do not allow anything other than the designated refrigerant to get mixed into the refrigerant cycle, such as air, nitrogen.etc.
If any refrigerant gas leaks while working on the unit, ventilate the room thoroughly right away.
ii. Use R41 OA only when adding refrigerant.
iii. Installation tools:
Make sure to use installation tools (gauge manifold, charge hose, etc.) that are exclusively use for R41 OA installations to
withstand the pressure and to prevent foreign materials (e. g. mineral oils and moisture) from mixing into the system.
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