Domestic Hot Water; Domestic Hot Water Settings - Bosch Buderus SSB399 Control Operations Manual

1 6 | Bosch Buderus SSB255 | SSB399 | SSB512 Boilers

6 Domestic Hot Water

6.1 Domestic hot water settings

Parameter
DHW Mode
(parameter #35)
DHW Tank Hyst. Down
(parameter #36)
DHW Tank Hyst. Up
(parameter #37)
DHW Tank Supply Extra
(parameter #38)
DHW Priority
(parameter #42)
DHW Max Priority Time
(parameter #43)
DHW Pump Overrun
(parameter #44)
DHW Tank Setpoint
(parameter #48)
Table 11
Data subject to change
When an Indirect tank is present in the system set DHW Mode to "1" when using the factory supplied 10K ohm
sensor or set to "2" if using a third-party aquastat. Default value is "0" (Off ).
The necessary temperature drop of the indirect tank temperature needed before the boiler will begin to recover the
tank. Only active when DHW Mode (par. #35) is set to "1" and a 10k ohm sensor is used. Default value is 7.2°F.
Adjustable between 36°F. Only applies to systems using a 10k ohm thermistor (Parameter #35 DHW Mode = "1")
The necessary temperature overshoot of the indirect tank temperature needed before the boiler will stop heating
the indirect tank. Default value is 0°F. Adjustable between 0°F and 36°F. Only applies to systems using a 10k ohm
thermistor (Parameter #35 DHW Mode = "1")
The Target Supply Water temperature to the indirect coil is equal to DHW Tank Setpoint (par. #48) + DHW Tank
Supply Extra.
Default setting is "0" - Timed DHW Priority. Timer starts when there is both a DHW and a call for heat. See DHW
Priority Time (par. #43) for adjusting the length of time priority is given over a call for heat. Setting a value of "1"
gives DHW unlimited priority over a call for heat. Setting the value to "2" gives a call for heat unlimited priority over a
call for domestic hot water
Default DHW priority [see DHW Priority (par.#42)] time is 30 minutes Adjustable from 1 to 255 minutes.
Length of time the DHW pump contacts remain energized after a call for DHW has ended. Default setting is 15
seconds. Adjustable between 0 and 255 seconds.
Target temperature of the indirect tank. Default value is 120°F. Adjustable between 104°F and 140°F.
Description
03.2018 | Bosch Thermotechnology Corp.
Control Operations Guide