Technical Sheet PRS Module

Juniper PRSinstantaneous & semi-instantaneous plate heat exchangers

DESCRIPTIONThe new PRS modules are designed to rapidly prepare Domestic Hot Water for medium and large-scale facilities; they can work both with accumulation (semi-immediate mode) or without (immediate mode)..COMPONENTS• Inspectable plate heat exchanger with steel structure and

exchanger plates made in stainless steel AISI 316L with EPDM gaskets

• Single or double pump for primary circuit• Motorized 3-way mixing valve• Electrical control panel with control unit for program-

mation• Temperature probes• Galvanized steel frame • 230V AC single phase supply.

OPTIONAL• Insulation for the heat exchanger in aluminium and

mineral wool (M0-A1 reaction to fire class)• Data Logger

OPERATING CONDITIONSMaximum Working pressure = 10 barMaximum temperature of the gaskets = 140 °C

WARRANTY2 years

PRS MODULEMODULE FOR IMMEDIATE DHW PRODUCTION

FEATURES AND FUNCTIONS OF THE PRS CONTROL UNIT

• Back-lighted display with representation of graphs and texts• Self-explanatory menu with captions• Simple visualization of the measured values• Temperature maintenance of the DHW inlet and of the DHW accumulation, set from the controller• High operational efficiency thanks to the proportional control of primary pumps speed• Performance of a series of anti-legionella disinfection cycles, schedulable at preferred time and day of the week, final

result showed on the display• DHW recirculation function control• Analysis and monitoring of the system through statistics• Computation of the exchanged heat, on a daily and weekly basis• Diagnostic unit function for temperature and flow probes

1 Primary Inlet

2 Primary Outlet

3 Domestic water inlet

4 Domestic hot water circuit outlet

1

2

3

4

ACCESSORIES

DATA LOGGER

Art. Nr.

5755280000029

• Remote monitoring• Historical anti-legionella cycles data recording on Micro

SD card• Registration of the temperatures achieved in the system

Kit includes: 5 Vdc transformer, Micro SD card, CAN-bus cable, terminating resistors and wall plugs.

INSULATION

Art. Nr. PRS Model

5655000020001 4620 (up to 31 plates)

5655000020002 4620 (up to 67 plates)

5655000020003 7420 (up to 29 plates)

5655000020004 7420 (up to 67 plates)

5655000020005 8031 (up to 47 plates)

5655000020006 8031 (from 49 to 57 plates)Insulation for the exchanger made with mineral wool and aluminum

case (M0-A1 reaction to fire class)

L

H

P

L

H

P

PRS MODULEMODULE FOR IMMEDIATE DHW PRODUCTION

MOD. N° ofPlates

P H

Lmod. HIGH temp.

Lmod. LOW

temp.

[mm]

4620

SINGLEPUMP

9

400 906

760 596

1317 21 25 29 33

780 61737 4145

4620

DOUBLEPUMP

9

403 906

868 703

1317 21 25 29 33

888 72437 4145

MOD. N° ofPlates

P H

Lmod. HIGH temp.

Lmod. LOW

temp.

[mm]

7420

SINGLEPUMP

9

400 1192

760 596

1317 21 25 29 33

780 61737 4145

7420

DOUBLEPUMP

9

403 1192

868 703

1317 21 25 29 33

888 72437 4145

MOD. N° ofPlates

P H

Lmod. HIGH temp.

Lmod. LOW

temp.

[mm]

8031

SINGLEPUMP

13493

1156

1085 99017 21 25 532 1091 99629

542 1111 101633 37 4145

545

1113 101849

1363 12685357

8031

DOUBLEPUMP

13

535

1156

1205 111017 21 25

1220 112529 33 37 41 542 1236 114145 49

551 1471 13765357

PRS – FOR LOW TEMPERATURE SYSTEMS

L

H

P

+

3 3/ /

with DOUBLE pump

+

with SINGLE pump

PRS – FOR HIGH TEMPERATURE SYSTEMS

L

H

P

+

3 3/ /

with DOUBLE pump

+

with SINGLE pump

1) IDENTIFICATION OF THE SYSTEMThe PRS module is available in two basic versions:one for high temperature and one for low tempe-rature. The models for high temperature feature a3-way mixing valve on the primary circuit, in orderto avoid deposits of limescale inside the exchanger. If the temperature of the primary circuit overcomes 60-65 °C it is necessary to choose the version forhigh temperature, while below this value it is pos-sible to use also the models for low temperature.

2) IDENTIFICATION OF THE MODELThe PRS module is available in three different sizes,depending on the size of the heat exchanger: 4620,7420 and 8031. In high temperature systems it is pre-ferable to use the model 4620, in the low temperature systems it is preferable to use the model 7420, while the model 8031 is recommended for high demandsof DHW.PLEASE NOTE: each exchanger is characterized by

a minimum DHW flow rate value, below this limit the

PRS module might not function properly. Hence it is

important to consider the values provided below for

the choice of the module and for the system sizing,

especially for the applications in which there is im-

mediate production of DHW.

MINIMUM FLOW RATE OF PRODUCIBLE DHW

PRS 4620 => DHW minimum flow rate = 0,60 m3/h (10 lt/min)



50 55 60 65 70 75 80 85

Primary circuit input temperature [°C]

HIGH TEMPERATURELOW TEMPERATURE

0 50 100 150 200 250 300 350 400 450

0 5 10 15 20 25 30

8031

7420

4620

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IDENTIFY THE BEST SOLUTION IN 5 EASY STEPS.

HIGH TEMPERATURE

LOWTEMPERATURE MODEL N° of PLATES CIRCULATION

PUMPS

1. Identify thesystem according to the temperature of the primary circuit (POINT 1)

2. Identify the most suitable model through the selection chart. (POINT 2)

3. Identify through the charts the number of plates needed. (POINT 3)

4. Choose how many circulation pumps you want on your module. (POINT 4)

CONFIGURATION

5. Choose amongthe configuration “with accumulation” or “without accumulation” . (POINT 5)

PRS MODULESELECTION PROCEDURE FOR PRS MODULE

3) CHOICE OF THE NUMBER OF PLATESOnce the model has been established, the choice of the number of plates can be made by using the selection charts presented in the following pages.Please read below to understand how to read the charts.THE FOLLOWING PARAMETERS NEED TO BE CONSIDERED:• The temperature difference between input and output of DHW (±TDHW): the domestic water is taken from public drinking water system generally at 10°C; then

it is heated up to the desired temperature set in the control unit of the PRS module.• The input temperature from the primary circuit to the exchanger (Tprim_IN): in the case of PRS modules with 3-way valve the Tprim_IN corresponds to the mixing

temperature of the primary fluid set in the control unit of the PRS module.• The DHW flow rate required to meet peaks in demand (Q’DHW)

EXAMPLE:

In a high temperature system, supposing that the needed flow rate is 3 m3/h (50 lt/min) of DHW at 48°C, we have identified the model PRS 4620.We consider the main inlet temperature to be 10 °C and the primary at 75 °C.As first step we have to identify the selection graph with our ±TDHW (10 ÷ 48 °C in this case).Next we will trace a vertical line in correspondence of the input temperature of the primary circuit (75 °C) and an horizontal line in correspondence of the required DHW flow rate (3 m3/h).The intersection of the two lines will represent the operational point of the PRS module in our peaks in demand. The number of plates required to guarantee the needs will be represented by the curve immediately above the point of intersection (in the specific case of the example this will be PRS 4620 with 33 plates).

4) CHOICE OF THE NUMBER OF CIRCULATION PUMPSEach PRS module is available either with single or with double pump on the primary circuit. The double pump allows a greater redundancy of the system, thanks to the backup alternating operation, hence a major assurance of continuity of water supply.

5) CHOICE OF CONFIGURATION ON USER SIDE (WITH OR WITHOUT DHW ACCUMULATION)The systems with DHW accumulation allow to produce domestic hot water at a stable temperature. Moreover, at the same operational conditions, it is possible tochoose smaller PRS modules since the accumulation tank works as a buffer that can satisfy the peaks in demand. For the models which foresee the accumulation, the central unit is specifically conceived to handle the inertial tank for DHW.

PLEASE NOTE: In case of configuration for accumulation, consult our calorifiers catalogue to complete the installation, by purchasing the accumulation tank

which bests suits the needs of users.

0

50

100

150

200

250

0,00

1,00

2,00

3,00

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5,00

6,00

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41�SODWHV

37�SODWHV

33�SODWHV

29�SODWHV

25�SODWHV

21�SODWHV

17�SODWHV

13�SODWHV

9�SODWHV PRS 4620

PRS MODULESELECTION PROCEDURE FOR PRS MODULE

PRS 4620

PRS MODULECURVES FOR CHOOSING PLATES- PRS 4620

0

50

100

150

200

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1,00

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29�SODWHV

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21�SODWHV

17�SODWHV

13�SODWHV

9�SODWHV

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50

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150

200

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0,00

1,00

2,00

3,00

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33�SODWHV

29�SODWHV

25�SODWHV

21�SODWHV

17�SODWHV

13�SODWHV

9�SODWHV


0

50

100

150

200

250

300

0,00

1,00

2,00

3,00

4,00

5,00

6,00

55 60 65 70 75 80 85 90 95

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1,50

2,00

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3,50

4,00

4,50

5,00

60 65 70 75 80 85 90 95

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41�SODWHV

37�SODWHV

33�SODWHV

29�SODWHV

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21�SODWHV

17�SODWHV

13�SODWHV

9��SODWHV

ǻ7�'�+�:�10 - 50 °C

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1,00

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50 55 60 65 70 75 80 85

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41�SODWHV

37�SODWHV

33�SODWHV

29�SODWHV

25�SODWHV

21�SODWHV

17�SODWHV

13�SODWHV

9�SODWHV


PRS 7420

0

20

40

60

80

100

120

140

160

180

0,00

0,50

1,00

1,50

2,00

2,50

3,00

3,50

4,00

4,50

50 55 60 65 70 75 80 85

45 plates

41 plates

37 plates

33 plates

29 plates

25 plates

21 plates

17 plates

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160

180

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3,50

4,00

4,50

50 55 60 65 70 75 80 85

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41�SODWHV

37�SODWHV

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4,50

55 60 65 70 75 80 85 90 95

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41�SODWHV

37�SODWHV

33�SODWHV

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2,00

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3,00

3,50

4,00

60 65 70 75 80 85 90 95

45�SODWHV

41�SODWHV

37�SODWHV

33�SODWHV

29�SODWHV

25�SODWHV

21�SODWHV

17�SODWHV

ǻ7�'�+�:�10 - 50 °C

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1,00

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2,00

2,50

3,00

3,50

4,00

50 55 60 65 70 75 80 85

45�SODWHV

41�SODWHV

37�SODWHV

33�SODWHV

29�SODWHV

25�SODWHV

21�SODWHV

17�SODWHV


PRS 8031

0

200

400

600

800

1000

1200

1400

0,00

5,00

10,00

15,00

20,00

25,00

30,00

35,00

50 55 60 65 70 75 80 85

13 plates

17 plates

21 plates

25 plates

29 plates

33 plates

37 plates

41 plates

45 plates

49 plates

53 plates

57 plates

ǻ7�'�+�:�10 - 45 °C

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200

400

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800

1000

1200

0,00

5,00

10,00

15,00

20,00

25,00

30,00

50 55 60 65 70 75 80 85

13 plates

17 plates

21 plates

25 plates

29 plates

33 plates

37 plates

41 plates

45 plates

49 plates

53 plates

57 platesǻ7�'�+�:�10 - 48 °C

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17 plates

21 plates

25 plates

29 plates

33 plates

37 plates

41 plates

45 plates

49 plates

53 plates

57 plates ǻ7�'�+�:�10 - 50 °C


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PRS MODULE

The following schemes are purely illustrative. To realize the installation, always refer to a qualified design engineer.

EXAMPLE OF INSTALLATION WITH MODULO PRS - FOR DHW ACCUMULATION

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PRS MODULEEXAMPLE OF INSTALLATION WITH MODULO PRS - WITHOUT DHW ACCUMULATION

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Modutherm Limited,Unit 4 GenesisEndeavour Drive Basildon, SS14 3WF

modutherm.co.ukTel: 0345 521 [email protected] member of the Modular Heating Group. CB/0120

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Technical Sheet PRS Module

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