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10. REFRIGERANT PIPING INSTALLATION
10.1 Length and Level Difference Requirements for the Piping Connections to the Indoor and Outdoor
Units
The length and level difference requirements for the refrigerant piping are different for different indoor and outdoor
units. Refer to the installation manual of the outdoor unit.
10.2 Piping Material and Size
1.
Piping material: Copper pipes.
2.
Piping size: Choose and purchase copper pipes that correspond to the length and size calculated for the
selected model in the installation manual of the outdoor unit and your actual project requirements.
10.3 Piping Layout
1.
Seal the two ends of the piping properly before you connect the indoor and outdoor piping. Once unsealed,
connect the piping of the indoor and outdoor units as quickly as possible to prevent dust or other debris from
entering the piping system via the unsealed ends, as this may cause the system to malfunction.
2.
If the piping needs to go through walls, drill the opening in the wall, and place accessories like casings and
covers for the opening properly.
3.
Place the refrigerant connecting piping and the communication wiring for the indoor and outdoor units
together, and bundle them tightly to make sure air does not enter and condensate to form water that may leak
from the system.
4.
Insert the bundled piping and wiring from outside the room through the wall opening into the room. Be careful
when you lay out the piping. Do not damage the piping.
10.4 Piping Installation
•
Refer to the installation manual attached with the outdoor unit on installation of the refrigerant piping for the
outdoor unit.
•
All gas and liquid piping must be properly insulated; otherwise, this may cause water to leak. Use heat
insulation materials that can withstand high temperatures above 120°C to insulate the gas pipes. In addition,
the insulation of the refrigerant piping should be reinforced (20 mm or thicker) in situations where there is
high temperature and/or high humidity (when part of refrigerant piping part is higher than 30°C or when the
humidity exceeds RH80%). Otherwise, the surface of the heat insulation material may be exposed.
•
Before the works are carried out, verify that the refrigerant is R410A. If the wrong refrigerant is used, the unit
may malfunction.
•
Other than the specified refrigerant, do not let air or other gases enter the refrigeration circuit.
•
If the refrigerant leaks during installation, make sure you fully ventilate the room.
•
Use two wrenches when you install or dismantle the piping, a common wrench and a torque wrench. See
Figure 4.1.
•
Slide the refrigerant piping into the brass nut (accessory), and expand the pipe socket. Refer to the following
table for the size of the pipe socket and the appropriate tightening torque.
Rinnai
Pipe fittings
Figure 12.
Normal wrench
Torque wrench
Pipe socket cap
21
Ducted Reverse Cycle Inverter Installation Manual (Indoor)
INSTALLATION INDOOR
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