Rinnai RHFE-308 FTR - Manual (Page 35)

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FLUE EXTENSION KITS
■ CAUTIONS
1. Maximum extendable length
FOR BEST ROOM AIR HUMIDITY, KEEP
WATER IN THE HUMIDIFIER TRAY.
2. To prevent water condensation
Condensed water
may accumulate
here, and cause a blockage
preventing combustion.
• 7.0 Metres less 1m per bend to a max 3
bends.
• The bend where the hose and pipes leave
the body is not counted.
• The air intake hose should run along the
exhaust pipe.
3. Condensed water formed by combustion, will
run back to the unit, and may overflow from the
condensation pan if pipes are longer than 2.0
metres. Therefore, pipes exceeding these
lengths should be made to drain to the outside
by giving their horizontal portions 3˚ or more
downward and outward slope.
CAUTION
Never allow the exhaust pipe to sag, as
condensed water may accumulate and
cause incomplete combustion.
3 slope(approximate)
Less than 2.0m
4. Wherever the air intake hose and exhaust pipe
run sideways, try to have the exhaust pipe on
top (to prevent the air intake hose from sagging
onto the exhaust pipe.)
Exhaust pipe
Exhaust pipe
Air intake hose
Air intake hose