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Appendix 1: Condensate
The Rinnai INFINITY condensing water heaters generate condensate continuously at a rate of
up to 5 litres per hour as a by-product of a highly efficient gas burner. This condensate must
be drained via a pipe to a suitable point of discharge. As condensate is a by-product of gas
combustion it is mildly acidic. For this reason copper tube MUST NOT be used as it will corrode.
Instead Rinnai recommend plastic pipes and fittings.
Important considerations for the condensate drain pipe
The content of AS/NZS 3500 ' Temperature / Pressure Relief and Expansion Control Valve Drain
Lines' has been used as a guide in preparing the information below.
Remove cap from condensate drain outlet
A. Water heater drain outlet connection, R½"
(15 mm) BSP male. Condensate drain outlet
connection, ½" (15 mm) BSP male nylon.
N.B: The black plastic shipping cap MUST BE
removed from the condensate drain outlet prior
to water heater operation.
B. PE R½" BSP (15 mm) female to barbed
irrigation system connector (13-19 mm) or
equivalent plastic fitting
C. Drain pipe and fittings to match B.
D. Continuous fall of at least 2° from water
heater to discharge point. Lengths and bends in
accordance with the table below.
Lengths and changes of direction
Max. length (m)
Max. changes of direction greater
than 45°
E. Suitable points of discharge are deemed to
be drains, sewers or pits. DO NOT discharge
onto electrical connections, earth stakes,
copper pipes, concrete paths or into a pond.
Non-PE plastics will fail over time due to contact with the acidic condensate. Damage caused by installation of non-PE plastics will not
1
be covered by warranty.
22 | Demand Rapid owner & installer guide 12949-B 02-19
A
B
C
.
1
9
8
7
6
3
4
5
6
D
2°
A
Installation
The drain line MUST NOT discharge onto
electrical connections, earth stakes, copper
pipes, concrete paths or into a pond.
The point of discharge from each drain
line shall be located so that the release of
condensate does not cause a nuisance, is
readily discernible and incurs no risk of damage
to the building.
There shall be no tap, valve or other restrictions
in any line.
Each line shall fall continuously from the valve
to the approved point of discharge.
Drain lines shall not discharge into a storage
water heater safe tray.
The end of the condensate line shall be:
•
Not lower than 200 mm or higher than
300 mm above an unpaved surface; or
•
Not lower than 75 mm, or higher than
300 mm above a gravel pit not less than
100 mm in diameter in a paved surface.
•
Where discharging over a tundish or gully
trap, drain lines shall have an air gap of a
size at least twice the diameter of the drain
line.
Condensate drain applies to
both internal and external
models. The external model is
NOTE
shown in this illustration.
E
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