Johnson Controls Hitachi MW-NP692A3 User Manual

8
4.4 Piping Work
2. When cutting the pipe, allow for an adequate depth for brazing as shown in the following table.
Copper Tube Cutter
Pipe
Connection
Part
Deburring
B
A
4.3 Connection Procedure for Piping Joint
When connecting liquid piping for the unit with a capacity 15 MBH or smaller, and when the length of piping is
49.2ft (15m) or longer, use a piping diameter size of 3/8 inch (9.52mm). Secure the connecting pipe as shown
below. Use the insulation attached to the indoor unit.
Brazing
Indoor
Unit
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.
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When installing pipe through the
wall, secure a cap at the end of
the pipe.
Attach a cap
or vinyl tape.
INCORRECT
CORRECT
INCORRECTCORRECT
Do NOT place the pipe directly
on the ground.
In case of rain attach a cap or
put a plastic bag over the pipe end.
Attach a cap
or vinyl tape.
INCORRECTCORRECT
Attach a cap
or plastic bag
with rubber
band.
Hole
Rain water
can enter.
inch (mm)
Diameter
(A)
Min. Insertion Depth
(B)
3/16
< A < 5/16
1/4 (6)
(5
< A < 8)
5/16
< A < 1/2
9/32 (7)
(8
< A < 12)
1/2
< A < 5/8
5/16 (8)
(12
< A < 16)
5/8
< A < 1
3/8 (10)
(16
< A < 25)
1
< A < 1-3/8
1/2 (12)
(25
< A < 35)
1-3/8
< A < 1-3/4
9/16 (14)
(35
< A < 45)
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 copper tube cutter as shown below.
Also deburr the
cutting edge using deburring tool to ensure that no burr goes inside the pipe.
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 other
tools which causes a large amount of powder residue when cutting.

Johnson Controls Hitachi MW-NP692A3 Specifications

General

Brand	Johnson Controls
Model	Hitachi MW-NP692A3
Category	Air Conditioner
Language	English