26
Installation Manual
Drain processing
• Expansion water may drop from the pressure relief valve and wet the floor.
Hot water piping
• Do not use lead, PVC, iron or any piping which has been treated with chromates, boiler seal or other
chemicals.
• Keep the pipe lengths to a minimum, and make sure that the pipework is well insulated as correct
performance of the appliance is dependent on properly insulated pipework.
• DO NOT FIT ANY VALVES OR RESTRICTORS TO THE OUTLET OF THE WATER HEATER.
• DO NOT FIT ANY OBSTRUCTION TO THE PRESSURE RELIEF LOCATED ON THE HOT WATER OUTLET
CONNECTION.
• Use mixing valves with low water resistance. Use shower heads with low pressure loss.
• If necessary, use a pump or other means to ensure that the supply water pressure to the inlet of the heater
does not fall below 199kPa when the maximum amount of water is being demanded. If the water pressure
drops below 200 kPa, local boiling can occur inside the water heater causing abnormal sounds and
decreasing the durability of the heat exchanger.
After purging the air from the system using the hot water supply taps, remove the water inlet strainer located
on the cold water supply inlet connection. Remove any debris from the filter and replace. When replacing the
filter, do not over-tighten the “O” ring seal.
No pressure reduction is required unless the water pressure exceeds 1000kPa.
27
Installation Manual
Condensate Piping
• This water heater is a high efficiency, fully condensing appliance which produces acidic condensate
during operation. The water heater incorporates a collection and removal system which must be properly
drained in order to ensure proper operation of this appliance as per AS3500.4.
• The pH level of the condensate is approximately 2-3. It should be drained as required by local code or
when the condensate could cause damage.
• In order to drain the condensate, a 1/2" threaded fitting is provided at the base of the water heater.
Do not reduce the size of this fitting or the drain piping to less than 1/2".
In cold climates, do not drain the condensate to the outdoors. If the drain pipe freezes during cold
weather, the pipe will not drain condensate and the unit will stop operating.
• Use plastic pipe, such as PVC, for the drain line. Do not use steel, black iron, or any other material which
can corrode when placed into contact with acidic condensate.
• Keep the length of the drain pipe as short as possible. Long runs or applications where the nearest drain is
above the water heater will require the use of a condensate pump. Size the pump to allow for a maximum
condensate discharge of 100ml/minutes from the water heater.
• Horizontal runs must be sloped 1/50 downwards the drain or condensate pump. The condensate will be
discharged by gravity force only. Make the drain pipe run as short as possible.
• The end of the drain pipe must not be submerged in water or blocked in any way. To ensure proper
drainage, leave the end of the drain pipe open to the atmosphere. Do not have a trap. Also, make sure
that there are no obstructions blocking the drain line from discharging condensate.
• Be sure to check that condensate is freely flowing from the drain piping after the system has been installed.
Condensate will begin flowing out of the water heater within 15 minutes after operation has started.
• Take measures to prevent the condensate drain lines from freezing (insulation, heat tape, electric heaters, etc.).
Drain pipe
Drain pipe
Drain connecting
supply
Heat insulation
material
Water heater
Do not pitch the drain line up
once a horizontal section has
been introduced. Always pitch
the drain line down to ensure
proper drainage.
Due to the acidic nature of the condensate, be sure to properly drain and if necessary, treat the condensate
prior to disposal. Damage caused by improperly handled condensate is not covered by the warranty.
CAUTION
SBB80RX_P001-P044_E_tonb.indd 26 2017/01/27 8:13:58
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