Piping Insulation; System Piping (Length) Limitations - Daikin RZQ200MY1 Installation Manual

Connect the piping downward
Cut the piping to
the required length
Precautions to piping connection
• Make sure the connection pipe does not come into contact with
the terminal cover of the compressor.
Adjust the height as shown in the below figure to prevent the
insulation material on the liquid side piping from contacting with
the cover.
In addition, make sure the connection pipe does not come into
contact with the compressor's bolts and shell plate.
• If there is a possibility that the condensed water on the stop valve
might flow into the indoor unit through gaps between the
insulation material and piping because the outdoor unit is located
higher than the indoor unit, caulk the gaps at the connection.
Terminal cover
Compressor
Caulking, etc.
Insulation material
[How to prevent entry of small animals]
• Caulk the piping through holes with putty or insulation material
(field supply) as shown in the below figure to prevent gaps.
(For the outdoor unit, entry by insects could cause short circuit
of the electrical component box.)

7-6 Piping insulation

• If temperature within the ceiling exceeds 30ºC and the humidity
over RH 80%, thicken the insulation material of the refrigerant
piping. (Thickness at least 20mm)
(Condensation might form on the surface of the insulation
material.)
• The connection piping (liquid side, gas side) and the refrigerant
branch kit must be insulated.
(Otherwise, it may cause water dripping.)
(Be sure to use the insulation material with high-heat-
resistance performance as the gas side piping can reach
temperature of about 120ºC)
12
Gas side accessory
piping (1)
Gas side piping
(field supply)
Bolt
Putty or insulation
material
(field supply)
CAUTION
For piping connected locally, wrap the insulation material
till the root segment of the stop valve. The naked piping
may result in condensation and burns.

7-7 System piping (length) limitations

Example of connection
Main piping
H1 between
indoor unit and
outdoor unit
Indoor unit
Maximum allowable length
• Between outdoor unit and indoor unit.
Piping length between outdoor unit and
Actual piping length
indoor unit ≤100m
Total piping length from outdoor unit to all indoor
Total piping length
units ≥10m, ≤300m
Allowable height difference
• Between outdoor unit and indoor unit.
Difference in height between outdoor unit
Difference in height and indoor unit (H1) ≤50m
(Max. 40m if the outdoor unit is in the lower part)
Selecting the piping size
[Precautions to select connection piping]
If the equivalent piping length between outdoor unit and indoor unit
is over 90m, size of the main pipe on the gas side and liquid side
must be increased.
In addition, depending on the distance of the refrigerant piping, size
of the main pipe also can be increased if capability decreased.
[Gas side] Ø19.1mm→Ø22.2mm [Liquid side] Ø9.5mm→Ø12.7mm
Outdoor unit
Main pipe
Note
To increase the size of the piping joint (Ø19.1mm→Ø22.2mm and
Ø9.5mm→Ø12.7mm), connect it using joints of different apertures
(field supply).
In addition, connection part should be set beside the outdoor unit
(behind the 1st bending outside the unit).
Outdoor unit
Indoor unit
Size increase