Condensate Disposal - andrews MAXXflo EVOCWH 120/302 Installation And Maintenance Manual

4.6 CONDENSATE DISPOSAL

Condensation is formed in the normal operation of the heater and this must be continuously discharged into
a drain. Given the acidity level of condense discharge (pH 3.5 - 4.5) only plastic material can be used for the
discharge pipe work. For a CWH 120 each 60kW heat engine can produce up to 6.0 litres of water per hour,
whilst at full load.
Use of 40mm plastic pipe with a drop of at least 45 mm for every metre of pipework is recommended. The trap
supplied as part of the appliance can be connected into an internal drain in many cases without the require-
ment for an additional air break. Wherever possible all condensate pipework should be installed inside the
plant room.
Any external pipework passing through a wall to the outside should be run in a minimum of 40mm diameter.
External pipework should be insulated to a minimum of 13mm protection against frost and freezing tempera-
tures. Insulation must be waterproof and UV resistant. The end of the pipe must be cut at 45
lated to the tip of the pipe.
CAUTION
The condensate trap must be fi lled with water before operating the heater.
It is important that the condensate fl ow must be maintained, even in freezing conditions. In the
event that the condensate becomes blocked, the heater will shutdown completely, and will not
operate again until the fl ow has been restored.
Soil / Vent Stack
There is no requirement for an additional trap or air
break when connecting drain pipework to an inter-
nal or external soil or vent stack
Installation
EXTERNAL CONDENSATE DISPOSAL EXAMPLES
Gully
There is no requirement for an additional trap
if discharging direct into an open gully.
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