Fact sheet
HM 322/328
Substation for apartment houses and small properties
Application
The HM 322/328 is an indirect substation for district heating featuring high performance and simple operation. The HM 322/328 is made in a compact design and is especially suitable for small properties and apartment houses. - either just for supply of heating (radiator and floor heating) or for supply of heating and domestic hot water (radiator heating and domestic hot water cylinder).
District heating (DH)
The substation is prefabricated with interconnecting components such as ball valves, thermometers, manometers, sensor pockets, differential pressure controller, strainer and fitting pieces for mounting of heat meter in the district heating return and supply line.
Heating (HE)
The heating side consists of a plate heat exchanger, safety valves, manometer, thermometers, non-return valves, air valve, circulation pump and mixing loop with circulation pump.
The heating temperature is controlled by an electronic temperature controller, Danfoss ECL, with an outdoor temperature sensor, in combination with an electronic actuator.
Mixing loop
The mixing loop provides a suitable temperature level e.g. for floor heating. A 3-way valve and an electrical actuator in combination with the ECL controller control the mixing loop.
Domestic hot water (DHW)
The substation is supplied with connection pipes for DHW cylinder on the secondary side and the temperature in the cylinder is controlled by the Danfoss ECL controller.
Construction
The HM 322/328 is built on a frame of galvanized iron and offers variable connection possibilities, as connection of pipes can be established both in the top or in the bottom of the substation. All pipes are made of stainless steel. The connections are made by nuts and gaskets. The HM 322/328 can be delivered with white-lacquered steel cover, with door.
Dimensioning
The HM 322/328 is flexible and can be dimensioned according to various output requirements and operational parameters.
FEATURES AND BENEFITS
•Substation for apartment houses and small properties
•Indirect heating - one or two heating circuits
•Connections for DHW cylinder on the secondary side
•Electronic control of heating (HE) temperature
•Capacity: 39 - 95 kW HE / 35 kW FH / 75 kW cylinder or radiator
•Pipes connection in top or bottom of substation = Savings in installations costs
•Pipes and plate heat exchanger made of stainless steel
•Electrical wiring from factory - Plug & Play
Heat exchanger
The heat exchanger used in the HM 322/328 is a brazed, highly efficient Danfoss plate heat exchanger, which has been tested and approved according to the PED-directive.
Depending on substation’s application, different heat exchangers dimensioned for central or floor heating can be used.
www.danfoss.com
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