CTC Union EcoZenith i555 Pro 1x230V, Installation And Maintenance Manual

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16 CTC EcoZenith i555 Pro
2.3.6 Speed-controlled charge pump (accessory
from CTC)
Each heat pump should be provided with a separate charge pump that is
controlled in tandem with its respective heat pump. If a speed-controlled
PVM charge pump (accessory from CTC) is connected to the heat pump
and controlled from the EcoZenith, the flow will be automatically set without
any adjustment needed via the control valve. In the upper tank the speed of
the charge pump will be controlled so that the heat pump always delivers its
highest possible temperature into the top of the EcoZenith. This provides for
quick access to DHW when the heat pump starts.
Towards the lower tank the speed-controlled charge pump will work for a
fixed difference between flow and return from the heat pump.
If a speed-controlled charge pump is not installed, the flow must be adjusted
manually, and the difference between incoming and outgoing water from the
heat pump will vary, depending on the operation conditions during the year.
In cases where an air/water heat pump is installed and the outdoor
temperature is lower than +2 °C, the charge pumps are started in order to
protect against frost. If a speed-controlled charge pump is installed, the pump
will only work at 25% of its maximum capacity. This provides for increased
savings on the charge pump’s operating economy, and the heat losses in the
EcoZenith are reduced compared to a conventional on/off charge pump.
Also refer to the "Heat pump" section in the "Detailed Menu Descriptions"
chapter (Installer/Settings/Heat Pumps 1-3).
2.4 Wood boiler
The EcoZenith can be connected to a wood boiler, such as the CTC V40.
The primary flow from the wood boiler is connected to the top of the
EcoZenith and the return flow to the wood boiler is connected to the lowest
connection on the lower tank.
When firing is started and the flue gas sensor and/or boiler sensor reaches
a set value (menu: “Installer/Settings/Wood boiler” factory-set “100/70 °C”),
the control goes into wood operation status when the temperature of the
lower tank is above or equal to its reference value (setpoint). When the flue
gas sensor is below the set value, wood operation status is interrupted.
It is recommended the wood boiler be provided with a charge system.
A charge system such as Laddomat 21 is recommended for optimum
performance. The charge pump in the charge system must be controlled
from the wood boiler. In special cases, such as operation with a water
jacketed stove, the charge pump may be controlled from the EcoZenith
without installing a charge system.
If the wood-fired system needs more water than the 540 litres contained in
the product, the system needs to be supplemented with an accumulator
tank.
Also refer to the "Wood boiler" section in the "Detailed Menu
Descriptions" chapter (Installer/Settings/Wood Boiler).
Schematic diagram only the installer adds expansion vessels, safety valves, etc., and sizes the system.