Mitsumi electronic PUHY-P-TGMU-A Installation of unit, Refrigerant piping installation

7. Installation of unit

7.1. Installation

[Fig. 7.1.1] (P.3)

A M10 anchor bolt procured at the site. B Corner is not seated.

•Fix unit tightly with bolts so that unit will not fall down due to earthquake or gust of wind.

•Use concrete or angle bracket for foundation of unit.

•Vibration may be transmitted to the installation section and noise and vibration may be generated from the floor and walls, depending on the installation con- ditions. Therefore, provide ample vibrationproofing (cushion pads, cushion frame, etc.).

•Be sure that the corners are firmly seated. If the corners are not firmly seated, the installation feet may be bent.

Warning:

•Be sure to install unit in a place strong enough to withstand its weight. Any lack of strength may cause unit to fall down, resulting in a personal injury.

•Have installation work in order to protect against a strong wind and earth- quake.

Any installation deficiency may cause unit to fall down, resulting in a personal injury.

When building the foundation, give full attention to the floor strength, drain water disposal <during operation, drain water flows out of the unit>, and piping and wir- ing routes.

Down piping and down wiring precautions

When down piping and down wiring are performed, be sure that foundation and base work does not block the base through holes. When down piping is performed, make the foundation at least 100 mm [3-15/16 in] high so that the piping can pass under the bottom of the unit.

8. Refrigerant piping installation

Connecting the piping is a terminal-branch type in which refrigerant piping from		Warning
the outdoor unit is branched at the terminal and connected to each of the indoor	When installing and moving the unit, do not charge it with refrigerant other
units.
	than the refrigerant specified on the unit.
The method of pipe connection is as follows: flare connection for the indoor units,
	-	Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to mal-

gas pipes for outdoor units, flare connection for P72 and brazed connection for P96 ~	function and result in severe damage.
P234; liquid pipes, flare connection. Note that the branched sections are brazed.

GB

Warning:

Always use extreme care to prevent the refrigerant gas from leaking while using fire or flame. If the refrigerant gas comes in to contact with a flame from any source, such as a gas stove, it breaks down and generates a poi- sonous gas which can cause gas poisoning. Never weld in an unventilated room. Always conduct an inspection for gas leakage after installation of the refrigerant piping has been completed.

8.1. Caution

This unit uses refrigerant R410A. Follow the local regulations on materials and pipe thickness when selecting pipes.

1Use the following materials for refrigeration piping.

•Material: Use refrigerant piping made of phosphorus deoxidized copper. In addition, be sure that the inner and outer surfaces of the pipes are clean and free of hazardous sulphur, oxides, dust/dirt, shaving particles, oils, moisture, or any other contaminant.

2Commercially available piping often contains dust and other materials. Always blow it clean with a dry inert gas.

3Use care to prevent dust, water or other contaminants from entering the piping during installation.

4Reduce the number of bending portions as much as possible, and make bend- ing radius as big as possible.

5Always observe the restrictions on the refrigerant piping (such as rated length, the difference between high/low pressures, and piping diameter). Failure to do so can result in equipment failure or a decline in heating/cooling performance.

6Either a lack or an excess of refrigerant causes the unit to make an emergency stop. Charge the system with an appropriate amount of refrigerant. At such a time, always properly charge the unit. When servicing, always check the notes concerning pipe length and amount of additional refrigerant at both locations, the refrigerant volume calculation table on the back of the service panel and the additional refrigerant section on the labels for the combined number of indoor units.

7Use liquid refrigerant to fill the system.

8Never use refrigerant to perform an air purge. Always evacuate using a vacuum pump.

9Always insulate the piping properly. Insufficient insulation will result in a de- cline in heating/cooling performance, water drops from condensation and other such problems.

0When connecting the refrigerant piping, make sure the ball valve of the out- door unit is completely closed (the factory setting) and do not operate it until the refrigerant piping for the outdoor and indoor units has been connected, a refrigerant leakage test has been performed and the evacuation process has been completed.

AResidues in commercially available antioxidants may have adverse effects on the equipment. Braze only with non-oxide brazing material. The use of other brazing material may result in compressor damage.

(Refer to item 9.2. for detailed information on pipe connections and valve op- erations.)

BNever perform outdoor unit piping connection work when it is raining.

Caution:

•Use a vacuum pump with a reverse flow check valve.

-If the vacuum pump does not have a reverse flow check valve, the vacuum pump oil may flow back into the refrigerant cycle and cause deterioration of the refrigerator oil and other trouble.

•Do not use the tools shown below used with conventional refrigerant. (Gauge manifold, charge hose, gas leak detector, check valve, refrigerant charge base, vacuum gauge, refrigerant recovery equipment)

-Mixing of conventional refrigerant and refrigerator oil may cause the refrig- erator oil to deteriorate.

-Mixing of water will cause the refrigerator oil to deteriorate.

-R410A refrigerant does not contain any chlorine. Therefore, gas leak detec- tors for conventional refrigerants will not react to it.

•Manage the tools more carefully than normal.

-If dust, dirt, or water gets in the refrigerant cycle, the refrigerator oil will dete- riorate.

•Never use existing refrigerant piping.

-The large amount of chlorine in conventional refrigerant and refrigerator oil in the existing piping will cause the new refrigerant to deteriorate.

•Store the piping to be used during installation indoors and keep both ends of the piping sealed until just before brazing.

-If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate and the compressor may fail.

•Do not use a charging cylinder.

-Using a charging cylinder may cause the refrigerant to deteriorate.

•Do not use special detergents for washing piping.

8.2. Refrigerant piping system

Connection Example

[Fig. 8.2.1] [Fig. 8.2.2] (P.3)

Å Outdoor model		ı Liquid pipe
Ç Gas pipe		Î Total capacity of indoor units
‰	Model number	Ï	Downstream unit model total
Ì	Branch kit model	Ó	The 1st branch of P168 ~ P234

¬4-Branching header (Downstream unit model total < 72)

=

Ô8-Branching header (Downstream unit model total < 144)

=

		<	234)
	10-Branching header (Downstream unit model total =
A Outdoor unit		B First branch
C Indoor unit		D Cap
*1	ø12.7 [1/2] for over 90 m [295ft]
*2	ø12.7 [1/2] for over 40 m [131ft]

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