York TIWM006B22S, Installation And Maintenance Manual

Page: 23 / 50

P5417090
19
6. Refrigerant Piping Work
Table 6.1 Piping Size
inch (mm)
Model Gas Piping Liquid Piping
TIWM006B22S
TIWM008B22S
TIWM012B22S
TIWM015B22S
1/2 (12.7) 1/4 (6.35)
TIWM018B22S
TIWM024B22S
TIWM030B22S
5/8 (15.88) 3/8 (9.52)
(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 deburring tool
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.
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.
For details of refrigerant piping work, vacuum pump and refrigerant charging, refer to the "Installation and
Maintenance Manual" for the outdoor unit.
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.
In Case of Getting the Pipe
Through a Hole in the Wall
Correct
Correct Incorrect Incorrect
Correct Incorrect
Hole Hole
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