6 2551868AB
TECHNICAL FEATURES
Typical ModuSat® XR & XR-ECO Unit
Note: The product may look different from the image shown.
Function and operation
District or communal heating system – the primary thermal energy is used to produce
domestic hot water and heating.
Domestic hot water (DHW) - the DHW is prepared via a plate heat exchanger and is
activated when flow is registered through the flow sensor located on the cold water inlet.
The electronically controlled Pressure Independent Control Valve (PICV) modulates the
primary flow rate to maintain the DHW temperature. This unit operates with the DHW
taking priority over HTG – when the hot water is used it will temporarily cut the heating
operation. Once the hot water outlets are closed the heating operation will be resumed.
Heating (HTG) – when the space heating demand is requested by the end user controller,
the heating operation is started. The electronically controlled PICV is used to modulate the
primary flow rate to match the heating demand. The unit has an integrated heating
circulation pump which is switched on when the heating is on and modulates based on
secondary heating delta T.
Keep Warm Facility – when the heat interface unit is set in the Comfort mode, the DHW
plate heat exchanger is kept warm by opening the domestic hot water PICV to pulse the
primary heating through the plate in order to maintain a set temperature. This is in order to
ensure a fast DHW response time.
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