Mitsubishi Electric CITY MULTI PUHY-HP-YHM-A Serie Manual De Instalación página 16

Caution:
• Do not vent R410A into the atmosphere.
• R410A is a Fluorinated Greenhouse gas, covered by the Kyoto Protocol,
with a Global Warming Potential (GWP) = 1975.
• Refrigerant pipe connection
This product includes connecting pipes for front piping and bottom post-piping.
(Refer to [Fig.10.2.2])
Check the liquid/gas piping dimensions before connecting the refrigerant pipe.
Refer to item 9.2 Refrigerant piping system for piping dimensions.
Make sure that the refrigerant pipe is not touching other refrigerants pipes, unit
panels, or base plates.
Be sure to use non-oxidative brazing when connecting pipes.
<Refrigerant piping connection examples>
[Fig.10.2.2] (P.6)
<A> Front pipe routing
<C> Included with outdoor unit
A Gas pipe (field supply required)
C Shape
• Front pipe routing
1 Connecting elbow (ID ø25.4, OD ø25.4) <Included with outdoor unit>
2 Connecting pipe (OD ø19.05, ID ø25.4) <Included with outdoor unit>
3 Connecting pipe (OD ø22.2, ID ø25.4) <Included with outdoor unit>
4 Connecting pipe (OD ø12.7, ID ø9.52) <Included with outdoor unit>
5 Connecting pipe (ID ø9.52, OD ø9.52) <Included with outdoor unit>
• Bottom pipe routing
2 Connecting pipe (OD ø19.05, ID ø25.4) <Included with outdoor unit>
3 Connecting pipe (OD ø22.2, ID ø25.4) <Included with outdoor unit>
4 Connecting pipe (OD ø12.7, ID ø9.52) <Included with outdoor unit>
*1 P200, P250: Expand the liquid pipe (ID ø9.52) and connect directly to the
valve. <field supply required>
• After evacuation and refrigerant charging, ensure that the handle is fully open.
If operating with the valve closed, abnormal pressure will be imparted to the
high- or low-pressure side of the refrigerant circuit, giving damage to the com-
pressor, four-way valve, etc.
• Determine the amount of additional refrigerant charge by using the formula,
and charge refrigerant additionally through the service port after completing
piping connection work.
• After completing work, tighten the service port and cap securely so as not to
generate any gas leakage. (Refer to the table on the below for appropriate
tightening torque.)
Appropriate tightening torque:
Outer diameter of
Cap (N·m) Shaft (N·m)
copper pipe (mm)
ø9.52 15
ø12.7 20
ø15.88 25
ø19.05 25
ø25.4 25
Caution:
• Keep the valve closed until refrigerant charging to the pipes to be added
on site has been completed. Opening the valve before charging the
refrigerant may cause damage to the unit.
• Do not use a leak detection additive.
[Fig. 10.2.3] (P.6)
A Example of closure materials (field supply)
B Fill the gap at the site
Make sure to seal-off the space around areas where the wires and refrigerant
pipes enter the unit to ensure that small animals, rainwater, or snow cannot enter
the unit through such openings and cause damage to the unit.
Caution:
Make sure to seal-off the openings for the pipe and wire retrieval.
• Small animals, rainwater, or snow entering through the openings may
cause damage to the device.
16
<B> Bottom pipe routing
B
Liquid pipe (field supply required)
Size of hexagonal Service port
wrench (mm) (N·m)
6 4
9 4
15 6 12
30 8
30 8