Installation guide

CONDENSE DRAIN
Condensation is formed in the heater and this must be
continuously discharged into a drain. A trap is supplied
which should be connected into a drain via a tundish or
air break. (See Fig 1a and 1b). The condense flow must
not be allowed to block otherwise the heater will fail to
work correctly. NOTE: AN AIR BREAK IS REQUIRED
DOWNSTREAM OF THE TRAP TO PROTECT THE
WATER HEATER FROM BLOCKAGES AND
SUBSEQUENT DAMAGE. Each 30kW module could
produce up to 3 litres of condense per hour while at
full load.
SECONDARY RETURN
CIRCULATION PUMP
An additional connection for a secondary circulation is
available in the top of the heater that is located between
the hot flow and cold feed ports. We would recommend
that a non-return valve is fitted in the return line.
If a secondary return circuit is fitted with a secondary
pump, please ensure that the flow-rate does not exceed
the heater maximum flow-rate. An excessive flow in the
secondary circuit could result in a temperature mixing
effect in the heater storage vessel resulting in a stored
water temperature less than the set temperature (see
table below).
Model Type CWH30 CWH60 CWH90 CWH120
Maximum
0.9 1.8 2.7 3.6
flow rate m
3
/h
XXXXXXXXX • SECTION XX
11
INSTALLATION • SECTION 3
11
C
irculation Pump
Secondary
Return Line
Cold Water
Fig 2