Operating instructions

10
Central ventilation units KWL EC 700/1400/2000 D Pro / WW
Installation and operating instructions
KWL EC .. Pro WW
☞
ATTENTION
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3.2.3 Hot water heater
A hot water heater ensures the comfortable and energy-efficient post-heating of supply air. This is particularly useful if
the supply air (heated outside air from the heat exchanger) is to be heated to a higher temperature level (normally room
temperature or higher).
– Connection and regulation of internal hot water post-heater (only Type KWL EC .. Pro WW)
The outside air and supply air which has been pre-heated by the heat exchanger can be additionally heated with the
internal hot water heater. A WHSH 1100 24V 0-10V Item No.: 8819 is required for this (WHSH not included in scope of
delivery), and the circulating pump integrated in the WHSH must be operated at medium capacity.
When using the hot water heater, it must be ensured that the hot water supply is guaranteed at all times, for example,
to prevent frost damage to the heater. The hydraulic unit must be connected to the ventilation unit by a specialist.
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A cover flat must be mounted in the outside air and in the exhaust air on KWL EC .. PRO WW units to
prevent damage to the hot water heater!
– Connection and regulation of external hot water post-heater (only Type KWL EC ... D PRO)
It is possible to integrate an external hot water post-heater on unit types KWL EC 700/1400/2000 D PRO. The heater
can be regulated with the controller by regulating the ventilation unit.
3.2.4 Frost-protection Hot water heater (only Type KWL EC . PRO WW)
The hot water heater frost-protection prevents hot water heater from freezing at extremely cold temperatures and in
case of non-functioning central heating.
Frost-protection is active if the following conditions are met:
Condition I: Outside air temp. (sensor EXT1) is less than +2 °C
Condition II: Temperature behind the heat exchanger (supply air) (sensor EXT2) is less than +5 °C
or
Condition III: Outside air temp. sensor (EXT1) is defective
or
Condition IV: Temperature sensor (EXT2) is defective
AND
Condition V: Hot water return flow temperature (sensor T
water
) is less than +15 °C
or
Condition VI: Temperature behind the hot water heater (sensor T
alarm
) is less than +6 °C
or
Condition VII: Temperature sensor on hot water return flow (T
water
) is defective
or
Condition VIII: Temperature sensor on hot water heater (T
alarm
) is defective
If both conditions are met, the frost-protection function will activate, and as soon one of the following conditions is met,
the frost-protection function will activate.
3.2.5 Frost-protection for downstream hot water heater
If the supply air temp. falls below +5 °C, the supply air ventilator will shut down. An error code will be displayed on the
controller.
fig.10
KWL EC .. Pro
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KWL EC .. Pro WW
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UK