Johnson Controls YVAHP072B31S, Service Manual

Page: 901 / 1796

4.4 Piping Work
(2) When cutting piping, secure the adequate depth for brazing as shown in the following table.
(1) Use clean copper pipes without any moisture or foreign materials on inner surface of pipes. When
connecting refrigerant pipe, cut the copper pipes with a pipe cutter as shown below. Also blow-out the
pipes with nitrogen or compressed air to ensure that no dust remains inside the pipe. Do NOT use a saw, a
grindstone or others which causes a large amount of cutting powder.
Pipe Cutter
Pipe
Connection
Part
Deburring
B
A
4.3 Connection Procedure for Piping Joint
When connecting liquid piping for a unit with a capacity of 15 MBH or smaller, and with a length of piping 49.2ft (15m)
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the insulation attached to the indoor unit.
Brazing
Insulation Attached to Indoor Unit
Field-Supplied Refrigerant Piping
Field-Supplied Insulation
Fix this part with the attached cord
band or field-supplied vinyl tape.
Insulate this part with the
attached insulation.
Use the flare nut of the indoor unit.
Expander for Liquid Line (Accessory)
Flare the pipe after inserting the flare nut.
Indoor
Unit
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Hole
Rain water
can enter.
When installing pipe through the
wall, install an end cap at the end of
the pipe.
Attach an end cap
or vinyl tape.
INCORRECT
CORRECT
INCORRECT CORRECT
Do NOT lay the pipe directly
on the ground.
Attach an end
cap or vinyl tape.
INCORRECT CORRECT
Attach an end cap
or vinyl tape with a
rubber band.
inch (mm)
Diameter
(A)
Min. Insertion Depth
(B)
3/16 < A < 5/16
1/4 (6)
(5 < A < 8)
5/16 < A < 15/32
9/32 (7)
(8 < A < 12)
15/32 < A < 5/8
5/16 (8)
(12 < A < 16)
5/8 < A < 31/32
13/32 (10)
(16 < A < 25)
31/32 < A < 1-3/8
15/32 (12)
(25 < A < 35)
1-3/8 < A < 1-25/32
9/16 (14)
(35 < A < 45)
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INSTALLATION