Bedienungsanleitung Buderus SB625WS (Seite 27 von 52) (Englisch)

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Commissioning | 27

6 720 805 218 (2016/02)SB625WS/SB745WS

Example DHW demand (where the 4000 series controls the DHW

system):

Sum of the set DHW temperature (140 °F) and parameter "Boiler rise"

(40 °F) in the "DHW" menu:

140 °F+ 40 °F = Maximum temperature demand 180 °F

Example heating circuits (where the 4000 series controls the

heating circuits):

Add of the set temperature of the heating circuit with mixing valve with

the highest temperature required (15 °F) and parameter "Boiler rise"

(160 °F) in the "Heating circuit data" menu:

160 °F+ 15 °F = Maximum temperature demand 175 °F

Notes on setting third party control units

• The third party control unit (building management system or PLC

controllers) must ensure a maximum internal boiler water

temperature that is sufficiently different from the high limit safety

cut-out. It must also be ensured that the digital burner controller

rather than the boiler water temperature regulator switch the burner

on and off.

• The control unit must ensure that the burner is switched to low load

before being shut down.

• Select control equipment that allows a gentle start-up with a time

delay when the system is cold.

• After the burner demand, an automatic timer (for example) should

limit the burner to low load for a period of approx. 180 seconds. This

restricted heat demand will prevent uncontrolled starting and

stopping of the burner.

• It must be possible to show the number of burner starts on the

control unit used.

6.2 Hydraulic connection to the heating system

▶ If the system temperatures are different, use both return connectors

3 (high temperature) and 2 (low temperature)(chapter 2.9.3.

Fig. 5 and 6,page 11, table 6, page 12)

▶ Connect heating circuits with high return temperatures to connector

3, and heating circuits with low return temperatures to connector 2.

▶ Restrict the water flow rate in the boiler to a temperature difference

of at least 7 K between supply and return.

▶ Size the pumps correctly.

▶ Before connecting the boiler, flush sludge and dirt out of the heating

system.

▶ Ensure that no oxygen enters the heating water during operation.

▶ Only operate the boiler in sealed unvented systems.

6.3 Hydraulic flow through boiler

The SB Series does not require a minimum flow rate in order to maintain

warranty. The boiler has been designed to operate with a temperature

difference between the supply and return of up to 100 °F. Flow should

be initiated with the start of the burner to minimize temperature

fluctuations and control deviations. The field installed manual reset high

limit (as required by CSD-1) must be fitted to the instrument bulb/probe

socket of the heating supply, set to 210 °F and electrically connected

into the Logamatic 4321 safety circuit terminals (17,18) or the burner

enable/disable circuit directly (see Fig 26).

Fig. 26

[1] Instrument bulb/probe socket of the heating supply

NOTICE: System damage due to incorrect sensor

position!

Safety cut-out and thermostat sensors of third party

control units must be fitted in the instrument bulb/probe

socket of the heating supply (Fig. 1[6], page 5) of the

boiler.

▶ Do not change the length of the immersion sleeve.

Unit Value

Temperature control unit s 40

Monitor/limiter s 40

Minimum difference between burner on and

off temperatures

K 7

Table 14 Conditions of use

For an optimum energy yield, we recommend supplying

a flow rate of  10  of the total nominal flow rate via the

low temperature flange, with a return temperature below

the dew point.

If there are no varying return temperatures, only the low

temperature flange needs to be connected.

Restriction of the temperature difference is not

necessary if the system is equipped with a dirt trap

device.

High flow rates and oversized pumps can result in the

accumulation of sludge or deposits on the heat

exchanger surfaces.

6 720 805 218-61.1T

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