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Condensate drain - EF models only
Installation of a condensate drain
Point of discharge from each drain line shall be located so the release of condensate does not
cause a nuisance, is readily discernible and incurs no risk of building damage. 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
drain 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 and 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 a drain line.
Joining of condensate drain lines
Condensate drain lines from multiple water heaters may be joined together provided they
conform with the installation requirements above.
Common stack discharge
Where individual heaters are installed in a multistorey building, the condensate drain lines may
discharge into a common stack subject to the following:
•
Drained to a tundish having a discharge line that is not less than the common stack,
directly connected to a fixture trap, and installed in a connection with any adjacent soil or
waste stack
•
Discharge point of the common stack is readily visible and does not cause any nuisance
•
Common stack is vented by extending the pipe upwards, above the roof level
Tundish drain lines
The drain line from any tundish shall be not less than DN 20 or less than one size larger than
that of the largest drain line discharging into the tundish. Tundish drain lines shall comply with
the installation requirements above.
Areas subject to freezing
In areas where water pipes are prone to freezing, the drain pipe from any valve
shall be insulated and not exceed 300 mm in length. It shall discharge into a
tundish through an air gap of not less than 75 mm and not exceed more than 150
mm measured from the outlet of the drain pipe to the rim of the tundish.
Rinnai New Zealand Ltd.
Continuous Flow Water Heater Installation Manual:
13
03-11
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