Refrigerant Piping Work; Piping Materials - York TIWM006B21S Installation And Maintenance Manual

6.

Refrigerant Piping Work

Use the specified non-flammable refrigerant (HFC R410A) for the outdoor unit refrigerant cycle. Do
not charge the unit with anything other than HFC R410A, such as hydrocarbon refrigerants (propane
and Isobutene), oxygen, and other flammable gases (acetylene, ammonia, and so forth), or any
poisonous gases when installing, maintaining and moving the unit. These substances are volatile
and dangerous and can result in fire, explosion, and serious or fatal injuries.
For details of refrigerant piping work, vacuum pump and refrigerant charging, refer to the "Installation and
Maintenance Manual" for the outdoor unit.
6.1

Piping Materials

(1) Tolerances of refrigerant piping lengths depend on the combination with the outdoor unit.
Refer to the "Installation and Maintenance Manual" for the outdoor unit.
(2) Select the piping size from the following table.
(3) Prepare field-supplied copper pipes.
(4) Select clean copper pipes. Make sure there is no dust and moisture inside.
(5) Make sure that moisture, old refrigerant, and other contaminants do not enter the refrigeration system.
Impurities can adhere to the expansion valve and can impair system operation.
(6) When cutting piping, do not use conventional tools such as saws or grinding wheel cutting disks that
produce harmful metallic filings and burrs that can damage a refrigerant system. Use a copper tube
cutter to eliminate metal filings produced by the cutting operation. After the cut is made, blow out each
pipe with dry compressed air or nitrogen to remove this residue before making pipe connections.
In Case of Getting the Pipe
Through a Hole in the Wall
Correct
Hole
Attach a cap or put a plastic bag
over the pipe end.
18
Table 6.1 Piping Size
Model
TIWM006B21S
TIWM008B21S
TIWM012B21S
TIWM015B21S
TIWM018B21S
TIWM024B21S
TIWM030B21S
Do not lay the pipe
directly on the ground.
Incorrect Correct
Hole
Attach a cap or put a plastic
bag over the pipe end.
Gas Piping Liquid Piping
1/2 (12.7) 1/4 (6.35)
5/8 (15.88) 3/8 (9.52)
In Case of Rain
Correct
Incorrect
Rain water
can come in.
Attach a cap or put a plastic
bag over the pipe end.
inch (mm)
Incorrect
Rubber Band
P5417052