Interconnection Of Condensate Drain Lines; Common Stack Discharge; Tundish Drain Lines; Areas Subject To Freezing - Rinnai REU-VR3237WG Operation & Installation Manual

CONDENSATE DRAIN (REU-KM' MODELS ONLY)
(g) 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.

INTERCONNECTION OF CONDENSATE DRAIN LINES

Condensate drain lines from multiple water heaters may be joined together provided they conform
with the 'INSTALLATION' requirements on page 27.

COMMON STACK DISCHARGE

Where individual water heaters are installed in a multistorey building, the condensate drain lines may
discharge into a common stack, subject to the following:
(a) The discharge from the common stack is to a tundish, having a discharge line, that is not less
than the size of the common stack, directly connected to a fixture trap, and installed in connection
with any adjacent soil or waste stack.
(b) The discharge point of the common stack is such that any discharge is readily visible and not
cause any nuisance.
(c) The 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 on page 27.

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 more than 150 mm measured from the outlet of the drain pipe to the rim of the tundish.
Rinnai Australia 28 Installation Manual