This manual is designed to be a quick guide to the most common type of instal-
lation for a Hitachi Yutaki M Monobloc system.
This assumes heating via a buffer tank or low loss header, domestic hot water
via a cylinder with sensor pocket and immersion heater, 3 port diverting valve
and Secon remote room RF wireless programmable temperature controller.
In the above system the monobloc units functions are controlled by the units own controller
and this is only used by the technician not the end user.
The end user controls the heating demand using a wireless room controller and can use this
to set the room temperature at different times of the day.
The heat pump controls the domestic hot water temperature itself (including for an optional
sterilisation cycle) using the 3 way valve and is assisted by the immersion heater.
There is no electric heater inside the monobloc unit. An optional inline heater can be used.
The 3 way valve is a diverting, not a mixing valve. When unpowered it provides flow to the
buffer tank. When powered it cuts off flow to the buffer tank and diverts it to hot water.
A buffer tank or low loss header is necessary to provide thermal separation and cope with low
load conditions. In addition a buffer tank gives the thermal mass necessary to avoid freezing
the heat exchanger during defrost mode.
A magnetic filter should be fitted in the return pipework and a pressure gauge in the flow.
T: 0191 516 6554 W: www.seconrenewables.com E: info@seconrenewables.com
* Please note—the monobloc unit contains a strainer
so an external one is optional as is a flowsetter.
* A magnetic filter is mandatory for all installations.
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