E93.1001EN.C Manual CD
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10
TECHNICAL DATA CD
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WATER HEATERS
2.1
Functional introduction
The CD
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water heaters are heaters with a maximum high efficiency. Such a performance can be reached by,
amongst other things, using a special heat exchanger made of stainless steel. This allows the flue gases to cool
down below the condensation point, and so release extra heat. This has an immediate positive impact on the
efficiency, exceeding the 100%.
The CD
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water heater is standard set for Natural gas G20 / G25.3
Gases used must meet the European standard EN 437.
Fuel used should have sulphur rates according to the European standard, a maximum annual peak over a short
period of time of 150 mg/m
3
and an annual average of 30 mg/m
3
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Water heater control includes the next programmable features:
Cascade control for up to twelve water heaters
Remote operation and heat demand indication from each water heater
Anti-Legionnaires’ disease function
0-10 VDC remote flow temperature (set point) control
NB! 0-10 VDC remote
burner input
control is NOT possible for this type of direct fired water heaters.
Cascade control
When using the integrated cascade control, a maximum of twelve heaters can be controlled in a cascade config-
uration. By the use of an appropriate external control, this number may be increased at will.
0-10 VDC connection available
The water temperature can be controlled by an external 0-10 VDC signal. When a number of water heaters are
cascaded, the signal should be directed to the master only. A signal of 1.48 Volt will switch on the water heater(s),
less than 1.4 Volt will switch off the water heater(s).
Time program
Time programs with three programmable periods per day are available.
These time programs are activated at the
control panel and offer great flexibility in controlling the water heater’s day and night temperatures as well as the
anti-Legionella settings.