Indoor Unit Installation - Drain Pipe - Rinnai Pro Series Installation Manual

Indoor unit installation - drain pipe

Indoor drain pipe installation
Thermally insulate the drain pipe to prevent condensation and leakage. Attach the end of the drain
hose to the unit's outlet pipe. Clip the end of the hose firmly in place with a pipe clasp.
The 11-18 kW models operate with positive pressure at the drain connections so a drain trap is
required. The trap needs to be installed as close to the unit as possible. Make sure the top of the
trap is below the connection to the drain pan to allow complete drainage.
Ceiling
7 - 9 kW models
• If the drain pipe is bent or installed incorrectly, water may leak and cause a water-level switch
malfunction.
• Thermally insulate the drain pipe.
• In HEAT mode the outdoor unit will discharge water, ensure the drain hose is placed in an
appropriate area to avoid water damage.
• The drain pipe should slope downward at a gradient of at least 1/50 to prevent water from
flowing back to the unit.
• To prevent sagging, place supports every 1-1.5 m.
• If sufficient fall cannot be achieved, connect the hose to the condensate pump. The initial lift
pipe must start no more than 200 mm from the unit and the vertical rise must be no more than
55 mm above the unit, refer diagram below.
• To prevent air bubbles, keep the drain hose level or slightly tiled up (<75 mm).
• Before installing ductwork conduct a drainage test to ensure correct installation. For new builds,
this test should be performed before the ceiling is installed.
7 - 9 kW models
Drain coupling (supplied)
Pipe clamp
Drain pipe
connecting port
OR
1-1.5 m
Fall 1/50
Stow tube
Insulation
Ceiling
>50mm
>50mm
>50mm
11 - 18 kW models
11 - 18 kW models
Fall 1/50
Drain trap
Stow tube
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