Rinnai MP2200 Operation & Installation Manual page 17

(e) Drain lines shall not discharge into a storage water heater safe tray.
(f) The end of the condensate drain line shall be:
(i) not lower than 200 mm or higher than 300 mm above an unpaved surface; or
(ii) 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.
(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
requirements of the "Installation Method" on page 16.
Common Stack Discharge
Where individual water heaters are installed in a multi-storey 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 requirements of the "Installation
Method" on page 16.
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
CONDENSATE DRAIN (REU-KM' MODELS ONLY)
17 Commercial Manifold Pack OIM