Duct Installation - Rinnai DONSR20Z9 Operation & Installation Manual

12. DUCT INSTALLATION

12.1 Design and Installation
1. In order to prevent short-circuit air delivery, the duct for air outlet and air return ducts must not be too close.
2. The indoor unit does not have an air filter installed. The air filter must be installed at a location like an air inlet
where it can be easily maintained. (Without an air filter, dust particles may stick to the coil which will make the
air conditioner prone to failures and water leakage.)
3. Before installing the duct, ensure that the static pressure of the duct is within the permitted range of the indoor
unit. Refer to "12.2 Fan Performance" on page 26.
4. Connect the canvas duct to the air return and air outlet ducts to prevent vibrations from the indoor unit
transferring to the ceiling.
5. Use insulation materials at a thickness of 25 mm or more to prevent condensation on the air duct.
6. Connect the air duct as shown in Figure 22.
On-site preparation required for all components except for the air conditioner.
NOTE
Once the air conditioner body and the canvas joints are riveted together, the upper flange plate
must be secured with screws.
(M6 x 12 screws are prepared on site.)
CAUTION
Rinnai
Primary
Secondary
Figure 21. Verify water discharge
Canvas Joint
Heat insulation layer
Air outlet
Figure 22.
Connecting pipes
for water discharge
Canvas Joint
Heat insulation layer
Return
Air Inlet
For Inspection
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INSTALLATION INDOOR