Mitsubishi Electric Mr.Slim PUZ-A NHA6 Series Installation Manual page 6

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A
B
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C Service port
D Open/Close section
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(1)
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(2)
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for A12-A36, 30 m 100 ft for A42.
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R410A refrigerant according to the permitted pipe lengths in the chart below.
* When the unit is stopped, charge the unit with the additional refrigerant through
the liquid stop valve after the pipe extensions and indoor unit have been vacu-
umized.
When the unit is operating, add refrigerant to the gas check valve using a safety
charger. Do not add liquid refrigerant directly to the check valve.
Model Max pipe length
PUZ-A18 30 m, 100 ft
PUZ-A24, A30, A36 50 m, 165 ft
PUZ-A42 50 m, 165 ft
6
B
A
C
H
D
E
F
I
G
E Local pipe
F Sealed, same way for gas side
G Pipe cover
H Do not use a wrench here.
Refrigerant leakage may result.
I Use 2 wrenches here.
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The stop valve shape, service port po-
sition, etc., may vary according to the
model.
* Turn section A only.
(Do not further tighten sections A and B
together.)
C Charge hose
D Service port
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Max height
20 m 24 m
difference
70 ft
0.06 kg
30 m, 100 ft 0
0.17 kg
30 m, 100 ft 0
30 m, 100 ft 0
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(1) Connect the testing tools.
‡ 0DNH VXUH WKH VWRS YDOYHV A B are closed and do not open them.
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1 Pressurize to 0.5 MPa (5 kgf/cm
not decrease.
2 Pressurize to 1.5 MPa (15 kgf/cm
not decrease.
3 Pressurize to 4.15 MPa (41.5 kgf/cm
refrigerant pressure.
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passed the test and there are no leaks.
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MPa (0.3 kgf/cm 2 G). Make the necessary corrections.
(4) If the pressure decreases in steps (2) or (3), there is a gas leak. Look for the source of
the gas leak.
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(1) Gas side of A24-A42 (Fig. 4-5)
1 Remove the cap, pull the handle toward you and rotate 1/4 turn in a counterclock-
wise direction to open.
2 Make sure that the stop valve is open completely, push in the handle and rotate
the cap back to its original position.
(2) Liquid side of A24-A42 and Gas/Liquid side of A12, A18 (Fig. 4-6)
1 Remove the cap and turn the valve rod counterclockwise as far as it will go with
the use of a 4 mm hexagonal wrench. Stop turning when it hits the stopper.
(ø6.35, 1/4 inch: Approximately 4.5 revolutions) (ø9.52, 3/8 inch: Approximately
10 revolutions)
2 Make sure that the stop valve is open completely, push in the handle and rotate
he cap back to its original position.
A Valve
B Unit side
C Operation section
D Cap
E Local pipe side
F Pipe cover
G Service port
H Wrench hole
Refrigerant pipes are protectively wrapped for A24-A42
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before or after connecting the pipes. Cut out the knockout in the pipe cover follow-
ing the groove and wrap the pipes.
Pipe inlet gap for A24-A42
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(If the gaps are not closed, noise may be emitted or water and dust will enter the
unit and breakdown may result.)
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Do not tighten the service port too much when installing it, otherwise, the valve core g
could be deformed and become loose, causing a gas leak.
After positioning section B in the desired direction, turn section A only and tighten it.
Do not further tighten sections A and B together after tightening section A.
* After charging the unit with refrigerant, note the added refrigerant amount on the
service label (attached to the unit).
Refer to the "1.5. Using R410A refrigerant air conditioners" for more information.
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can lead to abnormally high pressure and have a serious effect on operation per-
formance.
Additional refrigerant charging amount (kg/oz)
27 m 30 m 34 m
80 ft 90 ft 100 ft 110 ft
0.11 kg 0.17 kg
-
2 oz 4 oz 6 oz
0.34 kg 0.51 kg 0.68 kg
6 oz 12 oz 18 oz 24 oz
0.17 kg
0 0 0
6 oz
2
G), wait 5 minutes, and make sure the pressure does
2 G), wait 5 minutes, and make sure the pressure does
2 G) and measure the surrounding temperature and
I Double spanner section
(Do not apply a spanner other than to this sec-
tion.Doing so would cause refrigerant leaks.)
J Seal section
(Seal the end of the heat insulation material at
the pipe connection section with whatever seal
material you have on hand so that water does
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p g ,
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37 m 40 m 43 m 46 m
120 ft 130 ft 140 ft 150 ft
- - - -
0.85 kg 1.02 kg 1.19 kg 1.36 kg
30 oz 36 oz 42 oz 48 oz
0.34 kg 0.51 kg 0.68 kg 0.85 kg
12 oz 18 oz 24 oz 30 oz
,
49 m 50 m
160 ft 165 ft
- -
1.53 kg 1.70 kg
54 oz 60 oz
1.02 kg 1.19 kg
36 oz 42 oz