Condensation Drain; Reducing Heat Losses; Water Supplied By Storage Tank On The Roof - Rheem 3805 Series Owner's Manual And Installation Instructions

In locations where water pipes are prone to freezing, drain lines must be insulated, must not exceed
300mm in length and are to discharge into a tundish through an air gap of between 75mm and
150mm.
If a drain line discharges into a tundish, the drain line from the tundish must be not less than DN20.
The drain line from a tundish must meet the same requirements as for a drain line from a relief
valve.
For multiple installations the drain lines from several water heaters can discharge into a common
tundish.
Warning: As the function of the temperature pressure relief valve on this water heater is to
discharge high temperature water under certain conditions, it is strongly recommended the pipe
work downstream of the relief valve be capable of carrying water exceeding 93°C. Failure to
observe this precaution may result in damage to pipe work and property.

Condensation Drain

A drain line must be fitted to the condensate drain to carry the discharge clear of the water heater.
The drain line can be extended using 13 mm rigid hose or conduit. The pipe work from the
condensate drain should be as short as possible, and fall all the way from the water heater with no
restrictions. It should have no more than three right angle bends in it. The outlet of the drain line
must be in such a position that flow out of the pipe can be easily seen - but arranged so water
discharge will not cause damage or nuisance.
The condensate drain line must not be connected to the relief valves drain lines but may discharge
at the same point.

Reducing Heat Losses

The pipe work of the water heater must be insulated in compliance with all relevant standards, local
codes and regulatory authority requirements. The insulation must be weatherproof and UV resistant
if exposed.

Water supplied by storage tank on the roof

Please note the following if the incoming water is supplied from a roof mounted water tank:

The minimum acceptable inlet water pressure is 0.05MPa.

The tank must be at least 1 metre higher than the highest point in the plumbing system.

If the vertical distance between the bottom of tank and highest hot water outlet is
within 5 metres take care to avoid an air lock.

The cold water line from the supply tank should be adequately sized and fitted with a
full flow gate valve or ball valve to ensure full flow.
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