Eco Heating Systems CB 105 HW, Installation, Service And User Manual

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E93.1803.901 HW 29
Non Return valve
All water heaters have a non-return valve installed in the gas-air mixing pipe just before the burner. Flue gas
recirculation is prevented by the non-return valve. The prevention of recirculation also reduces standby losses
through the flue of the water heater. This creates a higher thermal efficiency.
Pump functionality
Delta T monitoring:
A high temperature difference between supply and return of the water heater can indicate a clogged heat ex-
changer or filter, or a defective pump. The burner load automatically decreases when the Return/Supply temper-
ature differential increases too much.
At maximum burner power ΔT is limited to 18
⁰
C and at low burner power a ΔT above 26
⁰
C is not allowed. Above
these values the water heater modulates down until the temperature difference is between 18 ⁰ C and 26 ⁰ C. If the
ΔT exceeds 35
⁰ C, the water heater will be temporarily switched off.
Frost protection
The water heater has a built-in frost protection automatically activating the water heater pump when the water
heater return (water) temperature drops below 10 °C (programmable). When the water heater Inlet temperature
drops below 5 °C (programmable), the burner is also ignited. The pump and/or water heater will shut down as
soon as the Inlet temperature has reached 15 °C (programmable). The mentioned temperatures are related to
the temperatures measured by the INLET sensor of the water heater. This frost protection function will not fire up
the water heater in case of a “general blocking” of the water heater demand.
- This frost protection function is only protecting the water heater and not the whole sanitary system.
- This frost protection function is only useable provided that water circulation through the system is possible - if
not, the water heater goes in a lock-out.
- Because it concerns a programmable setting, a water heater damaged by frost is not covered under warranty
The condensate trap must al-
ways be filled to the edge with
water, before replacing to the
unit.