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Bosch Buderus SSB800SA | SSB1000SA | SSB1000TL Boilers Control Operations Guide
01.2020 | Bosch Thermotechnology Corp.
Data subject to change
6 Domestic Hot Water
6.1 Domestic Hot Water Operation
The SSB Boiler onboard control can support domestic hot water production using
an indirect tank. The boiler can use either the supplied 10K ohm domestic sensor
or a aquastat (dry contact only, aquastat supplied by installer) to control the
heating of an indirect tank. The 10k ohm sensor or aquastat are wired to the #9 and
#10 low voltage terminal block of the SSB boiler. Parameter #35
Domestic Hot
Water Mode
must be set to the appropriate value depending upon which type of
sensor is used. Follow the instructions below for the sensor type you have chosen
to use with the SSB Boiler.
Using the supplied 10k ohm Sensor:
1.
Wire 10k ohm sensor to #7 and #8 on low voltage terminal strip on
managing boiler.
2. Within
the
Boiler Settings
menu set Parameter #35 to “1”.
3.
Set desired domestic hot water temperature using Parameter # 48.
4.
When the domestic hot water temperature falls
DHW Tank Hyst Down
degrees below the desired set temperature for hot water the boiler will
begin to heat the indirect tank with a setpoint of
DHW / Tank Setpoint
plus
DHW Tank Supply Extra
. The system will stop heating the tank when it
reaches
DHW / Tank Setpoint
plus
DHW Tank Hyst. Up
.
Using a
fi
eld-supplied aquastat:
1. Wire
your
fi
eld-supplied aquastat to #7 and #8 on low voltage terminal strip
on managing boiler.
2. Within
the
Boiler Settings
menu set Parameter #35 to “2”.
3. Adjust
the
fi
eld-supplied aquastat to the desired tank temperature
according to the manufacturers instructions .
4.
Upon a call for heat from the aquastat the boiler will target a supply
temperature of
DHW / Tank Setpoint
plus
DHW Tank Supply Extra
.
Depending upon which DHW Mode is selected (Mode 1 = 10 K ohm sensor or Mode
2 = Aquastat) will then determine which of the following parameters can be used to
adjust the hot water operation.
DHW Parameter
DHW Mode
Description
Default Value
Range
35
―
DHW Mode
0
0 - 8
36
1
DHW Tank Hyst. Down
9
0 – 36 °F
37
1
DHW Tank Hyst. Up
9
0 – 36 °F
38
1 & 2
DHW Tank Supply Extra
27
0 – 54 °F
42
1 & 2
DHW Priority
Time
Time, Off, On and Parallel
43
1 & 2
DHW Max Priority Time
60
1 – 255 min.
48
1 & 2
DHW/Tank Setpoint
122
104 – 158.9 °F
Table 9
