Manual Junkers MKB 400-3 A (page 61 of 116) (English)

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DHW heating

6 720 645 817 (2010/09)

DHW convenience

The performance factor to DIN 4108 corresponds to the

number of residential units to be supplied, each with

3.5 occupants, one standard bath tub and two further

draw-off points. Larger bath tubs may require a higher

factor; fewer occupants may require a lower one.

DHW priority circuit

A DHW priority or partial priority circuit can be selected

at the Fx controllers.

With a partial DHW priority circuit, it is advisable that the

heating circuits are designed as mixed heating circuits.

This way, low flow temperatures can still be achieved in

the heating circuits, even if there are high flow

temperatures during cylinder heating.

Cylinder temperature sensor

All DHW cylinders are equipped with an encoded NTC

cylinder sensor that is connected to the IPM 1 or IPM 2

load switching module. The cylinder temperature sensor

enables easy adjustment of the DHW temperature at the

controller for the indirectly heated cylinder.

Valves/taps

All commercially available mono lever taps and

thermostatic mixer valves can be used with Junkers

DHW cylinders. In the event of frequent successive

short-term drawing events, the set cylinder temperature

may overshoot and a hot layer may form in the upper

section of the cylinder. This temperature overshoot can

be reduced by connecting a DHW circulation line with a

timer-controlled DHW circulation pump. When making

the cold and hot water connections at the cylinder,

observe DIN 1988 and the regulations of the local water

board. For Junkers DHW cylinders up to 200 l capacity,

cold water safety assemblies are available from the

Junkers range of accessories. Provide the cold water

safety assembly on site for larger DHW cylinders.

When selecting the operating pressure for valves/taps,

ensure that the maximum permissible pressure

upstream of these valves/taps is restricted to 5 bar, in

accordance with DIN 4109 (noise protection in

buildings; source: Commentary DIN 1988, part 2,

page 156). For systems with a higher static pressure,

install a pressure reducer. The installation of a pressure

reducer is a simple but highly effective measure to

reduce excessive noise levels. For example, simply

reducing the flow pressure by 1 bar will result in a

reduction of the noise level by 2 to 3 dB(A)

(source: Commentary DIN 1988, part 2, page 156).

Connection on the water side of the cylinder

Make the cold water connection in accordance with

DIN 1988 using suitable individual fittings or a complete

safety assembly. The safety valve must be type-tested

and adjusted so that exceeding the permissible cylinder

operating pressure by more than 10 % is safely

prevented. If the static system pressure is lower than

80 % of the safety valve response pressure, install a

pressure reducer upstream of the safety valve.

To prevent water losses through the safety valve as far

as possible, we recommend the installation of an

expansion vessel that is suitable and approved for DHW

(Æ page 64).

The blow-off line must not be able to be closed and must

terminate freely and visibly in a drainage point. Sizing is

subject to the cylinder size:

For cylinders with 200 to 1000 l capacity, the following

standard values apply for sizing:

• Size of the safety valve (inlet connection): DN 20

• Connection thread (inlet): R ¾

• Connection thread (outlet), blow-off line: R 1

Condensing

boiler

Cylinder heat input in kW

Min. Max.

KBR 120-3 A 28 113

KBR 160-3 A 38 150

KBR 200-3 A 56.2 187

KBR 240-3 A 67.6 225

KBR 280-3 A 79.2 263

MKB 240-3 A 28 226

MKB 320-3 A 38 300

MKB 400-3 A 56.2 374

MKB 480-3 A 67.6 450

MKB 560-3 A 79.2 526

Tab. 34 Cylinder heat input from condensing boilers in kW

CAUTION: Damage through overpressure

If using a non-return valve, the safety valve

must be installed between the non-return

valve and the cylinder connection (cold

water).

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Junkers MKB 400-3 A Manual

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