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other positions due to various heating and hot water requirements
with no inconvenience.
• Lower setting of DHW temperature reduces fuel consumption.
2. Product Description
Harmony-D is a room sealed mono-thermal exchanger combination
boiler with 24.1 kW nominal output to provide both central heating and
domestic hot water.
Despite the complexity of the system, all inner pipe work and compo-
nents are designed to allow easy access for the service engineer.
Ignition of the burner is provided automatically by the electronic ignition
system.
The latest design of main integrated electronic board controls all safety
and operational functions automatically.
A diagnostic section monitors boiler operation mode and indicates faults
to the user by a Carrier© blue LCD screen located on the fascia panel.
A degree of frost protection is built into the boiler controls. When the
boiler temperature falls under 6°C, the boiler starts to operate until a
temperature of 15°C is reached on CH side. Additionally, there is also an
antifreeze DHW protection function that operates under 5°C until 8°C is
reached. These control functions prevent the boiler from freezing.
When there is no heat demand during 24 hours, pump is activated by the
control board for 30 seconds to prevent the pump from getting jammed
due to inactivity.
User controls are on a modern, aesthetic, and functional control panel
on the boiler front. The controls allow the user to set the central heating
temperature to between 30°C and 80°C and the DHW temperature to
between 35°C and 60°C.
Boiler has got those features:
• Continuous full modulation for both domestic hot water and central
heating,
• Three ignition attempts, (one ignition attempt for operating with
LPG)