Mitsubishi Electric PUZ-HA.NHA2 Serie Manual De Instalación página 6

4. Installing the refrigerant piping
@ Stop valve <Liquid side>
Stop valve <Gas side>
© Service port
Open/Close section
®
®
®f J
(_ Local pipe
Fig. 4-4
(_ Sealed, same way for gas side
@ Pipe cover
(_ Do not use a wrench here.
Refrigerant leakage may result.
(_ Use two wrenches here.
(1)
®
®
®
®
Fig. 4-5
(2)
® /9
®
Fig. 4-6
* The figure to the left is an example only.
The stop valve shape, service port po-
sition, etc., may vary according to the
model.
* Turn section @ only.
(Do not further tighten sections @ and ®
together.)
© Charge hose
Service port
Fig. 4-7
4.4. Refrigerant pipe airtight testing method
(1) Connect the testing tools.
• Make sure the stop valves @ ® are closed and do not open them.
• Add pressure to the refrigerant lines through the service port © of the liquid stop valve
©.
(2) Do not add pressure to the specified pressure all at once; add pressure little by little.
dP Pressurize to 0.5 MPa (5 kgf/cm2G), wait five minutes, and make sure the pressure
does not decrease.
® Pressurize to 1.5 MPa (15 kgf/cm2G), wait five minutes, and make sure the pressure
does not decrease.
® Pressurize to 4.15 MPa (41.5 kgf/cm2G) and measure the surrounding temperature
and refrigerant pressure.
(3) If the specified pressure holds for about one day and does not decrease, the pipes have
passed the test and there are no leaks.
• If the surrounding temperature changes by 1 °C, the pressure will change by about
0.01MPa (0.1 kgf/cm2G). 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.
4.5. Stop valve opening method
(1) Gas side (Fig. 4-5)
dP Remove the cap, pull the handle toward you and rotate 1/4 turn in a counter-
clockwise direction to open.
® 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 (Fig. 4-6)
dP 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.
(_6.35, 1/4 inch: Approximately 4.5 revolutions) 0a9.52, 3/8 inch: Approximately
10 revolutions)
® Make sure that the stop valve is open completely, push in the handle and rotate
he cap back to its original position.
@ Valve
® Unit side
© Operation section
@ Cap
® Local pipe side
® Pipe cover
@ Service port
@ Wrench hole
(_ Double spanner section
(Do not apply a spanner other than to this sec-
tion.Doing so would cause refrigerant leaks.)
@ 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
not infiltrate the heat insulation material.)
Handle
Refrigerant pipes are protectively wrapped
• The pipes can be protectively wrapped up to a diameter of _a90 ram, 3-35/64
inch before or after connecting the pipes. Cut out the knockout in the pipe cover
following the groove and wrap the pipes.
Pipe inlet gap
• Use putty or sealant to seal the pipe inlet around the pipes so that no gaps
remain.(If the gaps are not closed, noise may be emitted or water and dust will
enter the unit and breakdown may result.)
Precautions when using the charge valve (Fig.4-7)
Do not tiqhten the service port too much when installinq it, otherwise, the valve
core could be deformed and become loose causina a aas leak.
After positioning section @ in the desired direction, turn section @ only and tighten it.
Do not further tighten sections @ and ® together after tightening section @.
4.6. Addition of refrigerant
• Additional charging is not necessary if the pipe length does not exceed 30 m, 100 ft
• If the pipe length exceeds the specified length above, charge the unit with addi-
tional 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.
* 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.
• Be careful when installing multiple units. Connecting to an incorrect indoor unit
can lead to abnormally high pressure and have a serious effect on operation per-
formance.
Max pipe Max height Additional refrigerant charging amount
length difference 30 m 33 m 37 m 40 m 43 m 46 m 49 m 52 m 55 m 58 m 61 m 64 m 67 m 70 m 73 m 75 m
100ft 110ft 120ft 130ft 140ft 150ft 160ft 170ft 180ft 190ft 200ft 210ft 220ft 230ft 240ft 245ft
0oz 6oz 12oz 180z 24oz 30oz 360z 42oz 480z 54oz 600z 66oz 720z 78oz 84oz 860z
75m, 245ft 30m, 100ft 0kg 0.2kg 0.4kg 0.5kg 0.7kg 0.9kg 1.0kg 1.2kg 1.4kg 1.5kg 1.7kg 1.9kg 2.0kg 2.2kg 2.3kg 2.4kg
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