Danfoss HM 322, HM 328 Fact sheet

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

CIRCUIT DIAGRAM  EXAMPLE

DH
Supply

DH
Return

P, M and S refer to ECL Instruction manual

HE
Supply

HE
Return

Cylinder
Supply

Cylinder
Return

1 Plate heat exchanger HE
4 Diff. pressure controller AVP-F
5 Strainer
6 Non-return valve
7 Ball valve
8 Circulation pump Cyl. / HE
8A Circulation pump, HE
11 Safety valve HE
13 Thermometer
14 Manometer w/shut-off valve
15 Manometer
17 Air valve
22 Needle valve
23 Sensor pocket for heat meter
24 Fitting piece for heat meter
25 Controller Danfoss ECL310/A247
26 Outdoor sensor
27 Sensor forward/return
28 Sensor DHW cylinder
29 Actuator AMV13
30 2-way valve VS2
31 Actuator AMV 150
32 3-way valve VMV 30/15
54 Jumo safety thermostat (option)

Technical parameters:

Nom. pressure
(prim/sec):
Max. supply temp: 120 ºC
Min. ∆P:
Chloride compounds: Max. 300 mg/l

PN 16 / PN 10

See capacity examples

50

Cover 1030

Max. 917

890

Connections:

50

Cover 420

380

40

1. District heating (DH) return

2. District heating (DH) supply

3. Cylinder return

4. Cylinder supply

5. Heating (HE) supply

Weight incl. cover: Max. 100 kg

(incl. packing)

Cover: White-lacquered steel

1180

Electrical supply: 230 V AC

Dimensions (mm):

Without cover: H1373 x Wmax. 917 x D380
With cover: H1200 x W1030 x D420

Connections sizes:*

DH: G 1” (int. thread)
HE: G 1¼” (int. thread)

Cylinder: G 1” (int. thread)

* for substation illustrated on the front page

CAPACITY, WEIGHT AND DIMENSIONS

Heating: Capacity examples

Substation

type

Plate heat

exchanger

heating

capacity

kW

HM322 XB 37M-1 20 45 80 44.6 0.41 22 35 27 23 65 45
HM322 XB 37M-1 20 39 70 40.1 0.43 14 35 30 25 60 30
HM328 X B37M -1 30 55 80 40.7 0.30 35 35 27 20 65 45
HM328 X B37M -1 30 55 70 39.5 0.49 20 35 30 35 60 30
HM328 X B37M -1 40 75 80 43.0 0.35 35 35 27 40 65 45
HM328 X B37M -1 40 75 70 39.7 0.52 20 35 30 55 60 35
HM328 X B37M -1 20 95 80 44.2 0.41 35 35 27 60 65 45
HM328 X B37M -1 20 95 70 39.9

* Heat meter not incl.

Tot al

DH

supply

°C

118

22064110

110 110

130 110

1 2 3 4 65

The connection sizes are adapted to the pipe dim. as follows:
Pipe dim. 22 mm: 1” connections
Pipe dim. 28 mm: 1¼” connections

DH

return

°C

Pressure

loss

Primary

*bar

Heating
capacity

Floor heat-

ing
kW

Floor heat-

ing

circuit

supply

°C

HEATING: CAPACITY EXAMPLES

**)

0.58 20 35 30 75 60 30

Berechnet auf 70% der Heizleistung + TWW Kapazität von 32,3 kW bei einer Fernwärme Vorlauftempe-

ratur von 60 ° C oder 70 ° C.

Floor heat-

ing
circuit
return

6. Heating (HE) return

Options:

Cover 1200

• Cover, white-lacquered steel, with door

• Prepared for insertion of heat meter

• Pipe insulation

• Insertion of larger plate heat exchanger
for larger output

Capacity

cylinder or

radiator

°C

kW

Cylinder or ra-

diator circuit

supply

°C

Danfoss Redan A/S · District Heating · Omega 7, Søften · DK-8382 Hinnerup · Denmark
Tel.: [phone] · Fax: [phone] · [e-mail] · www.redan.danfoss.dk

Cylinder or ra-

diator circuit

return

°C

© Danfoss | DHS-SRMT/ PL | 2017 . 12

VL.HE.G3.02