Bosch Buderus SSB255 Control Operations Manual Download Page 25

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Control Operations Guide

Bosch Buderus SSB255 | SSB399 | SSB512 Boilers

| 25

Bosch Thermotechnology Corp.

03.2018

Data subject to change

Summary of Contents for Buderus SSB255

Page 1: ... Operations SSB255 SSB399 SSB512 Control Operations Guide WARNING the heating system can cause personal injury and property damage Follow these instructions precisely If you require assistance or further information contact a licensed ...

Page 2: ...2 Bosch Buderus SSB255 SSB399 SSB512 Boilers Control Operations Guide 03 2018 Bosch Thermotechnology Corp Data subject to change ...

Page 3: ...gs Menu 5 3 Heating Modes 6 3 1 Central heating CH mode 6 4 General Operation Settings 12 5 Outdoor Reset Curve Settings 14 6 Domestic Hot Water 16 6 1 Domestic hot water settings 16 6 2 Domestic hot water operation 17 7 Cascade Operation 18 7 1 Cascade operation settings 18 7 2 Cascade operation set up of boilers 20 7 3 Cascade start sequence 22 7 4 Cascade stop sequence 22 8 Start up Commissioni...

Page 4: ...ded will result in death or serious injury WARNING indicates a hazardous situation which if not avoided could result in death or serious injury CAUTION indicates a hazardous situation which if not avoided could result in minor to moderate injury NOTICE is used to address practices not related to personal injury Important information This symbol indicates important information where there is no ris...

Page 5: ...Temperature 29 Weather Setpoint Domestic Hot Water 35 Domestic Hot Water Mode 36 Domestic Hot Water Tank Diﬀerential DOWN 37 Domestic Hot Water Tank Diﬀerential UP 38 Domestic Hot Water Tank Supply Extra 42 Domestic Hot Water Priority 43 Domestic Hot Water Priority Time 44 Domestic Hot Water Pump Overrun 48 Domestic Hot Water Tank Setpoint Cascade Operation 72 Permit Emergency Mode 73 Boiler Addre...

Page 6: ... target Setpoint temperature by CH Hysteresis par 7 the burner will shut oﬀ until the Supply Temperature Sensor drops the value of CH Hysteresis below the target Setpoint Temperature Example If CH Setpoint is set for 140 F and CH Hysteresis is set for 10 F and there is a call for heat on 11 and 12 the burner will start when the Boiler Supply Temperature System Supply Temperature sensor for cascade...

Page 7: ...de corresponds with a target boiler water temperature of 140 F If CH Hysteresis is set for 10 F and there is a call for heat on 11 and 12 then the burner will turn on when the Boiler Supply Temperature sensor System Supply Temperature sensor for cascade reads a temperture of 130 F or less and will remain operating until the call for heat is satisiﬁed or until the sensor reads a temperature of 150 ...

Page 8: ...60 F The outdoor temperature falls below this value The boiler energizes Boiler and CH pump contacts Based on the heating curve programmed by the installer in this application the calculated supply water temperature on this particular temperature day corresponds to a target boiler water temperature of 140 F If CH Hysteresis is set for 10 F and and the outdoor temperature remains below the value of...

Page 9: ...The application calls for a setpoint of 140 F with and Hysteresis setting of 10 F When the temperature of the Boiler Supply Temperature sensor System Supply Temperature sensor for cascade falls below 130 F the value of CH Setpoint minus CH Hysteresis the burners will turn on Burners will remain on as long as the sensor does not exceed 150 F the value of CH Setpoint plus CH Hysteresis In the evenin...

Page 10: ...imum and maximum setpoint settings If the Boiler Supply Temperature sensor System Supply Temperature sensor for cascade exceeds the targeted setpoint plus CH Hysteresis par 7 the burner will shut oﬀ until the sensor reads CH Hysteresis below the targeted Setpoint Temperature Once the initial demand has occurred The Boiler and CH pump contacts will remain energized as long as the voltage from the B...

Page 11: ...rate at the corresponding Power The Power will be based upon the voltage signal and scaled between the Minimum and Maximum power settings Once the initial demand has occurred The Boiler and CH pump contacts will remain energized as long as the voltage from the BMS remains greater than 1 VDC Figure 2 OFF 1 0 1 5 2 0 ON 9 Voltage VDC Max Power Min Power Modulation Power CentralHeating CH Mode Descri...

Page 12: ...urner will turn oﬀ The burner will not turn on until the boiler supply system supply for cascade sensor value has fallen the same amount equal to the diﬀerential below the target setpoint temperature Anti Cycle Period parameter 9 The amount of time in seconds the boiler will wait before restarting The parameter is adjustable from 10 seconds to 900 seconds in 10 second increments Anti Cycle Temp Di...

Page 13: ...ernal pump wiring to the CH terminal DHW PUMP T_store CH supply out in DHW CH return CH PUMP Primary Heat Exchanger DHW_mode 1 DHW PUMP DHW_stat CH supply out in DHW CH return CH PUMP Primary Heat Exchanger DHW_mode 2 CH supply CH return CH PUMP T_return T_flue T_supply Safety Limit Primary Heat Exchanger DHW_mode 0 Ch only CHW PUMP L J6 1 J6 3 J6 2 J7 1 N L PE Figure 5 Pump mode 1 Boiler with one...

Page 14: ...he boiler will target the Baseline Supply Temperature Design Supply Minimum Limit parameter 23 The minimum supply water temperature the heating system will provide to the system May be the same value as Parameter 21 Design Supply Maximum Limit parameter 24 The maximum supply water temperature the heating system will provide to the system May be the same value as Parameter 19 Warm Weather Shutdown ...

Page 15: ... not been satisﬁed within the time limit in minutes deﬁned within Boost Time Delay the boiler supply water temperature will be increased by Boost Temp Increment see above The default value for this parameter is 20 minutes The parameter is adjustable from 1 to 120 minutes Night Setback Temp parameter 28 Only available for CH Modes 2 and 3 The value the heating curve will be reset as long as contact...

Page 16: ...lt 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 DHW Tank Supply Extra parameter 38 The Target Supply Water temperature to the indirect coil is equal to DHW Tank Setpoint par 48 DHW Tank Supply Extra DHW Priority parameter 42 Default setting is 0 Timed DHW Priority Timer starts when there is both a DHW and a call for heat Se...

Page 17: ...or hot water the boiler will begin to heat the indirect tank To change this switch on diﬀerential adjust Parameter 36 to the desired value The switch oﬀ diﬀerential can be set separately using Parameter 37 The default value for this parameter is zero Using a field supplied aquastat 1 Wire your ﬁeld supplied aquastat to the low voltage terminals 9 and 10 on the boiler main control panel 2 Within th...

Page 18: ...t Boiler parameter 75 The amount of time in seconds which must pass once the previous boiler in the cascade rotation is above the power percentage deﬁned in parameter 82 next boiler start rate and the system supply sensor is below the target temperature by the value deﬁned in parameter 77 Diﬀerential Down Start Boiler Default value is 15 seconds Adjustable from 5 to 300 seconds Delay Period Stop N...

Page 19: ...e the Managing boiler will begin the process of bringing on the next boiler within the cascade See Parameter 75 for further information on the amount of time which must pass at this power percentage before the next boiler in the cascade rotation is enabled Default value is 80 Adjustable from 10 to 100 Next Boiler Start Rate parameter 83 The percentage of burner power a boiler must reach before the...

Page 20: ...s ON The S4 switch is located on a small cut out on the front of the main control board of the boiler All other boilers in the cascade should have the S4 switch in the Oﬀ or Down position WARNING Never adjust the S4 switch with the power on always turn power oﬀ ﬁrst before changing the S4 switch position Figure 8 ON OFF S4 4 Set the address of each boiler in the Cascade The Managing boiler should ...

Page 21: ...Based on Weather Setpoint and WWSD CH Mode 3 Permanent set point demand CH Mode 4 Analog control 0 10Vdc of set point temperature Parameter 35 DHW Mode only if there is an indirect tank connected to the system Cascade Parameters See section Cascade Start and Stop Sequence for a detailed explanation of the Cascade operation It is recommended to set the following Cascade Parameters for your speciﬁc ...

Page 22: ...Managing boiler must wait to bring on the next boiler until a period of time equal to Delay Period Start Next Boiler par 75 has past After this period of time has past the Managing boiler checks the power of all boilers which are burning and if the system temperature is below the desired setpoint and the power of the operating boilers is greater than the value of Next Boiler Start Rate par 82 then...

Page 23: ...y set and should not be adjusted Fan Speed Minimum parameter 93 Minimum fan speed RPM based upon Parameter 97 Appliance Model and Parameter 98 Gas Type see below This parameter is factory set and should not be adjusted Fan Speed Ignition parameter 94 Ignition Fan Speed is set based upon shorter exhaust air intake lengths As your combined equivalent lengths increase the total straight length of pip...

Page 24: ...rol 5 Scroll to each of the following parameters and adjust the default values to the following values Parameter 1 Central Heating Mode Set CH Mode based upon desired control method CH Mode 0 Setpoint control of the boiler using dry contacts TT CH Mode 1 Outdoor Reset using ON OFF control of the boiler using dry contacts TT CH Mode 2 Full Outdoor reset with no heat demand CH Mode 3 Permanent set p...

Page 25: ...Control Operations Guide Bosch Buderus SSB255 SSB399 SSB512 Boilers 25 Bosch Thermotechnology Corp 03 2018 Data subject to change ...

Page 26: ...26 Bosch Buderus SSB255 SSB399 SSB512 Boilers Control Operations Guide 03 2018 Bosch Thermotechnology Corp Data subject to change ...

Page 27: ...Control Operations Guide Bosch Buderus SSB255 SSB399 SSB512 Boilers 27 Bosch Thermotechnology Corp 03 2018 Data subject to change ...

Page 28: ...United States and Canada Bosch Thermotechnology Corp 65 Grove Street Watertown MA 02472 Tel 866 642 3198 Fax 954 776 5529 www boschheatingandcooling com BTC 438002101 B 03 2018 ...

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