Mitsubishi Electric TRANE TPEFYP015MH142A Manual De Instalación página 10

7. Connecting refrigerant pipes and drain pipes
7.1. Refrigerant piping work
This piping work must be done in accordance with the installation manuals for
both outdoor unit and BC controller (simultaneous cooling and heating series R2).
• Series R2 is designed to operate in a system that the refrigerant pipe from an
outdoor unit is received by BC controller and branches at the BC controller to
connect between indoor units.
• For constraints on pipe length and allowable difference of elevation, refer to
the outdoor unit manual.
• The method of pipe connection is brazing connection.
Connecting refrigerant piping
Caution:
• Install the refrigerant piping for the indoor unit in accordance with the
following.
1. Cut the tip of the indoor unit piping, remove the gas, and then remove the
brazed cap.
[Fig. 7.1.1] (P.3)
Cut here
A
Remove brazed cap
B
Caution:
Before removing the brazing, cut off the end of the pipe to release any gas.
If the gas is not released, the pipe may fly off.
2. Pull out the thermal insulation on the site refrigerant piping, braze the unit
piping, and replace the insulation in its original position.
Wrap the piping with insulating tape.
* Before brazing the refrigerant piping, always wrap the piping on the main
body, and the thermal insulation piping, with damp cloths to prevent
heat shrinkage and burning the thermal insulation tubing. Take care to
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Note:
• When blazing the refrigerant pipes, be sure to blaze, after covering a
wet cloth to the pipes of the units in order to prevent it from burning
and shrinking by heat.
[Fig. 7.1.2] (P.3)
Cool by a wet cloth
A
• Pay strict attention when wrapping the copper piping since wrapping
the piping may cause condensation instead of preventing it.
[Fig. 7.1.3] (P.3)
Thermal insulation
A
Wrap with damp cloth
C
Ensure that there is no gap here
E
3. ���������������������������������������
thermal insulation tubing as shown below.
[Fig. 7.1.4] (P.3)
A Thermal insulation tubing 1
B Caution:
Pull out the thermal insulation on the refrigerant piping at the site, braze the piping,
and replace the insulation in its original position.
Take care to ensure that condensation does not form on exposed copper piping.
C Refrigerant piping (liquid)
E Main body
G Site refrigerant piping
H Ensure that there are no gaps between the insulation and the main body.
I Thermal insulation tubing (small) (accessory) 1
J Tie band (large) (accessory) 4
K Ensure that there is no gap here. Place join upwards.
L Thermal insulation tubing (large) (accessory) 2
Refrigerant amount adjustment
Refer to the installation manual for the outdoor unit for details on adjusting the
amount of refrigerant.
Cautions On Refrigerant Piping
u Be sure to use non-oxidative brazing for brazing to ensure that no for-
eign matter or moisture enter into the pipe.
u Be sure to apply refrigerating machine oil over the flare connection
seating surface and tighten the connection using a double spanner.
u Provide a metal brace to support the refrigerant pipe so that no load is
imparted to the indoor unit end pipe. This metal brace should be pro-
vided 50 cm away from the indoor unit's flare connection.
10
Pull out insulation
B
Return to original position
D
Wrap with insulating tape
F
D Refrigerant piping (gas)
F Thermal insulation tubing 2
Warning:
Do not use refrigerant other than the type indicated in the manuals pro-
vided with the unit and on the nameplate.
- Doing so may cause the unit or pipes to burst, or result������������
ing use, during repair, or at the time of disposal of the unit.
- It may also be in violation of applicable laws.
- MITSUBISHI ELECTRIC TRANE HVAC US LLC cannot be held responsible
for malfunctions or accidents resulting from the use of the wrong type of refrig-
erant.
Caution:
• Use refrigerant piping made of C1220 (Cu-DHP) phosphorus deoxidized
copper as specified in the JIS H3300 "Copper and copper alloy seam-
less pipes and tubes". 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.
• 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.
• Use ester oil, ether oil or alkylbenzene (small amount) as the refrigera-
tor oil to coat flares and flange connections. (For models using R410A)
- The refrigerant used in the unit is highly hygroscopic and mixes with water
and will degrade the refrigerator oil.
7.2. Drain piping work
• Ensure that the drain piping is downward (pitch of more than 1/100) to the
outdoor (discharge) side. Do not provide any trap or irregularity on the way.
• Ensure that any cross-wise drain piping is less than 20 m [65 ft] (excluding
the difference of elevation). If the drain piping is long, provide metal braces to
prevent it from waving. Never provide any air vent pipe. Otherwise drain may
be ejected.
• Use a hard vinyl chloride pipe O.D. ø32 mm [1-1/4 in] for drain piping.
• Ensure that collected pipes are 10 cm [3-15/16 in] lower than the unit body's
drain port.
• Do not provide any odor trap at the drain discharge port.
• Put the end of the drain piping in a position where no odor is generated.
• Do not put the end of the drain piping in any drain where ionic gases are
generated.
• When 2 drains are necessary, attach the drain hose to the adjacent drain
piping not in use.
• When the drain piping connection is one place, please do not use the drain
piping closed with the rubber cork.
• Install drain piping so that there are no leaks from piping connections.
• Adequately insulate the pipes to prevent condensation water from dripping.
- When running a drain hose in a ceiling where it is high in temperature and
humidity (dew-point temperature of 26°C [79°F] or higher) and operating
the units for a long time at a time, condensation may form on the drain
hose. Insulate the drain hose or take other appropriate measures to pre-
vent condensation water from dripping.
• Insulate the drain pipe that runs through a room with commercially available
insulator (polyethylene foam with specific gravity of 0.03 and a minimum
thickness of 10 mm [7/16 in]).
1 When installing a unit on the top floor or in a high-temperature high-
humidity environment, use an insulator with greater thickness than what
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2 ��������������������
[Fig. 7.2.1] (P.4)
Correct piping
Wrong piping
A Insulation (9 mm [3/8 in] or more)
B Downward slope (1/100 or more)
C Support metal
K Air bleeder
L Raised
M Odor trap
Grouped piping
D O. D. ø32 mm [1-1/4 in] PVC TUBE
E Make it as large as possible. About 10 cm [3-15/16 in].
F Indoor unit
G Make the piping size large for grouped piping.
H Downward slope (1/100 or more)
I O. D. ø38 mm [1-1/2 in] PVC TUBE for grouped piping.
(9 mm [3/8 in] or more insulation)
J Up to 700 mm [27-9/16 in]
N Drain socket (accessory)
O Horizontal or slightly upgradient
-
our client, if any.