Johnson Controls MAHP18B21S - Refrigerant Piping Work; Table 12. Piping Size

PMGB0406B rev.1
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20. Refrigerant Piping Work
Table 12. Piping Size
inch (mm)
DX-Kit Model
Liquid Piping
(IN/OUT)
Applicable Air Handler
Model
Gas Piping with Reducer* Liquid Piping
EXV-018E
ĭ3/8 (9.52)
AP18BX21 ĭ3/4 (19.05)
ĭ5/8 (15.88)
ĭ3/8 (9.52)
EXV-024E AP24BX21 ĭ3/4 (19.05)
ĭ5/8 (15.88)
EXV-030E AP30BX21 ĭ3/4 (19.05)
ĭ5/8 (15.88)
EXV-036E AP36BX21, AP36CX21 ĭ3/4 (19.05)
ĭ5/8 (15.88)
EXV-048E AP48DX21, AP48CX21 ĭ7/8 (22.2)
ĭ5/8 (15.88)
EXV-060E AP60DX21, AP60CX21 ĭ7/8 (22.2)
ĭ3/4 (19.05)
(3) Prepare ¿ eld-supplied copper pipes.
(4) Select clean copper pipes. Make sure there is no dust and moisture inside.
(5) The refrigerant oil for the refrigerant R410A is susceptible to moisture, an oxide ¿ lm, and fatty oil. Take
special care during the installation so that moisture, contaminations or old refrigerant oil will not enter
the refrigerant cycle. Otherwise, impurities may adhere to the expansion valve and it may prevent
proper operation.
(6) When cutting the pipes, use a pipe cutter to avoid grind swarf generation for the pipe cutting work. Blow
the inside of pipes with nitrogen or dry air to remove any dust or foreign materials before connecting
pipes. Do not use any tools which produce a lot of swarf such as a saw or a grinder.
(1) The tolerance of refrigerant piping length differs depending on the combination with the outdoor unit.
Refer to “Installation and Maintenance Manual” of the outdoor unit for details.
(2) Select the piping size from the following table.
For details on refrigerant piping work, vacuum pump, and refrigerant charge, refer to the "Installation and
Maintenance Manual" for the outdoor unit.
Use the speci¿ ed non-À ammable refrigerant (R410A) to the outdoor unit in the refrigerant cycle.
Do not charge the unit with materials other than R410A, such as hydrocarbon refrigerants (propane
and isobutan), oxygen, À ammable gases (acetylene, ammonia, etc.) or poisonous gases when
installing, maintaining and moving the unit. These À ammables are extremely dangerous and may
cause explosion, a ¿ re, or injury.
20.1 Piping Materials
*Change the gas connection piping diameter of the air handler by using the reducer to connect to VRF
system.
In Case of Getting the Pipe
Through a Hole in the Wall
Correct
CorrectIncorrect Incorrect
Correct Incorrect
HoleHole
Attach a cap or put a plastic bag
over the pipe end.
Attach a cap or put a plastic
bag over the pipe end.
Attach a cap or put a plastic
bag over the pipe end.
Rubber Band
Do not lay the pipe
directly on the ground.
Rain water
can come in.
In Case of Rain
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2016/11/2515:32:54