Danfoss PM2 P Fact sheet
Danfoss PM2+P Domestic Hot Water Controller
Proportional flow controller with integrated differential pressure controller
Unique control technology with
Application
The Danfoss PM2+P controller is used to
control the domestic hot water temperature in combination with a plate heat
exchanger in the Danfoss Redan product
series Akva Vita II.
Capacity
The capacity of the controller fully covers
the domestic hot water need of a standard
dwelling.
Function,
The controller is pressure controlled. It is
designed with
control feature, which ensures that district
heating water is led to the instantaneous
water heater only when hot water is tapped and that the flow of district heating
water is shut off, when the tapping of domestic hot water ends.
The PM2+P controller is supplied with
a built in differential pressure controller,
which ensures a constant pressure drop
over the control valve. This ensures a very
stable domestic hot water temperature,
which is independent of variations in differential pressure.
Standby losses
Due to the
nality of the controller, standby losses are
avoided. When the tapping of domestic
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function, a pressure
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energy saving functio-
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function, which saves energy and spares the environment.
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hot water ends, the controller immediately
shuts off the flow of district heating water
into the heat exchanger. This means that
energy (district heating) is needed only,
when hot water is tapped.
Lime scale deposits in the heat exchanger
Normally no lime scale will occur when
the heat exchanger is used in combination
with a PM2+P controller. When hot water
is not consumed, the district heating flow
is also shut off and the temperature in the
secondary side of the heat exchanger does
not exceed the temperature (approx. 55°C),
at which lime scale is deposited.
Materials
The controller is made of materials, which
have been approved for fresh water purposes.
The controller housing is made of dezincification-free brass. The spindle is made of
stainless steel and the sensor of copper. All
O-rings and the membrane are made of
EPDM rubber.
Options
If the domestic water installation is made
with circulation, it is recommended to
establish a bypass above the district
heating part of the PM2+P controller.
By means of a return flow thermostat and
the connecting capillary tubes separate
control of the circulation and domestic hot
water temperature is made possible.
Mounting
The controller must be installed in a way
that allows the medium to flow in the direction as shown on the drawing on the
back page. The insertion position of the
sensor is optional and it is recommended
that the sensor is placed firmly into the hot
water outlet connecting piece of the heat
exchanger.
FEATURES AND BENEFITS
• Suitable for low temperature areas
• Perfect control of domestic hot water
temperature under all conditions
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• With
• No standby losses, - low energy consump-
tion
• Maximum comfort
• Control range 45 - 65°C
• VA approved
save
function
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VL.GE.O1.02 © Danfoss 11/2010
Danfoss PM2+P with
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Principle:
When tapping starts, cold water flows into the secondary side of
the controller (1), passes the secondary side cone (2), leaves the
controller (3) and enters the heat exchanger. The pressure drop generated during tapping of domestic hot water is transferred to the
diaphragm (4) which transfers the force to the spring. This causes the
main spindle (5) to move to the right, which opens the primary side
cone (6). The opening results in primary ow entering from the heat
exchanger into the controller (7), where it passes the primary side
cone (6) of the integrated dierential pressure controller (8) and leaves the controller (9).
The temperature sensor mounted on the secondary hot water side is sensing the temperature. If the temperature is deviating from the setting temperature the thermostatic element will move (open/close) primary
side cone (6) until desired temperature is reached. By rotating the handle for temperature setting (10), the
domestic hot water temperature can be adjusted. The setting range of the controller is 45°C to 65°C.
When there is no demand for domestic hot water, the heat exchanger is always cold. A bypass function ensures that the supply pipe for the water heater is always kept warm, so that hot water is produced immediately,
when tapping starts. The no-load temperature is set on the bypass thermostat (13) and is independent on
the set domestic hot water temperature.
Domestic hot water circulation connection (11) and idle controller connection (12) are placed directly on the
controller. If the domestic water installation is made with circulation, the circulation pipe is connected to the
connecting piece of the controller (11). The bypass thermostat is connected to the controller (12). The circulation water temperature is controlled individually by the bypass thermostat (13), independently of the set
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domestic hot water temperature. The built in dierential pressure controller (8) ensures optimum operation
of the domestic hot water controller under all operating conditions.
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function
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Main data for the PM2+P controller:
Dimensions, weight
Size of packaging: H76 x W61 x L206 mm.
Weight: 1.3 kg. (incl. of packaging).
Materials
Controller housings: Dezincification-free brass
Piston: MPPE Noryl
Spindle /guide: Stainless, acid-resisting steel
O-rings / membrane: EPDM
Sensor: Copper
Technical data
Nominel diameter
Version 2,4 3,0
Min. flow rate, primary 70 l/h 100 l/h
Max. flow rate, primary 1000 l/h 1200 l/h
Min. flow rate, secondary 120 l/h
Max. flow rate, secondary 1400 l/h
Nominal pressure, primary PN 16
Max. Δp, primary
Max. temperature, primary 120°C
Setting range 45 - 65°C
Medium DH water/glycolic water 30%
DN 15
6 bar
Dimensioned sketches:
Variants:
Angular with union nut connection
Angular with O-ring connection
Danfoss Redan A/S · District Energy Division · Omega 7 · Søften · DK-8283 Hinnerup
Tel.: +45 87 43 89 43 · Fax: +45 87 43 89 44 · redan@danfoss.com · www.redan.danfoss.dk
VL.GE.O1.02 © Danfoss 11/2010 DKDHR
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