Bosch Buderus SSB399 Gebrauchs- und Wartungshandbuch

Bosch Buderus SSB Boiler Control 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

2 |Bosch Buderus SSB255 | SSB399 | SSB512 Boilers Control Operations Guide

03.2018 |Bosch Thermotechnology Corp.

Data subject to change

Control Operations Guide Bosch Buderus SSB255 | SSB399 | SSB512 Boilers | 3

Bosch Thermotechnology Corp. |03.2018 Data subject to change

Table of Contents

1 Key to Symbols and Safety Instructions 4

1.1 Key to symbols 4

1.2 Safety 4

2 Boiler Settings 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 & Commissioning Settings 23

9 Cascade Quick Set-Up 24

4 |Bosch Buderus SSB255 | SSB399 | SSB512 Boilers Control Operations Guide

03.2018 |Bosch Thermotechnology Corp.

Data subject to change

1 Key to Symbols and Safety Instructions

1.1 Key to symbols

Warnings

Warnings in this document are identiﬁed by a

warning triangle printed against a grey background.

Keywords at the start of a warning indicate the type and seriousness

of the ensuing risk if measures to prevent the risk are not taken.

The following keywords are deﬁned and can be used in this document:

DANGER indicates a hazardous situation which, if not avoided, 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 risk to people or property.

1.2 Safety

Please read safety precautions before installation

WARNING:

Improper installation, set-up, modification, operation or

maintenance of the heating system can cause personal injury

and property damage.

Follow these instructions precisely.

If you require assistance or further information, contact a

licensed contractor / gas fitter.

Control Operations Guide Bosch Buderus SSB255 | SSB399 | SSB512 Boilers | 5

Bosch Thermotechnology Corp. |03.2018 Data subject to change

2 Boiler Settings Menu

Function Parameter Description

General Operation

1 Central Heating (CH) Mode

2 Pump Mode

3 CH Setpoint

4 System Pump Overrun

5 Boiler Pump Overrun

7 Central Heating Hysteresis (Diﬀerential)

9 Anti Cycle Period

10 Anti Cycle Temperature Diﬀerential

11 Ramp Delay Step Modulation

14 Maximum Power Central Heating

15 Minimum Power Central Heating / DHW

Outdoor Reset Curve

19 Design Supply Temperature

20 Design Outdoor Temperature

21 Baseline Supply Temperature

22 Baseline Outdoor Temperature

23 Design Supply Minimum Limit

24 Design Supply Maximum Limit

25 Warm Weather Shutdown

26 Boost Temperature Increment

27 Boost Time Delay

28 Night Setback 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 Address

74 Emergency Setpoint

75 Delay Period Start Next Boiler

76 Delay Period Stop Next Boiler

77 Diﬀerential DOWN Start Boiler

78 Diﬀerential UP Stop Boiler

79 Maximum Setpoint Oﬀset DOWN

80 Maximum Setpoint Oﬀset UP

81 Start Modulation Delay Factor

82 Next Boiler START Rate

83 Next Boiler STOP Rate

84 Boiler Rotation Intervale

85 Domestic Hot Water Boiler Assign

Start-up & Commisioning

89 Frost Protection

90 Frost Protection Setpoint

91 Domestic Hot Water Maximum Limit

92 Fan Speed Maximum

93 Fan Speed Minimum

94 Fan Speed Ignition

97 Appliance Model

98 Gas Type

99 Flue Length Range

Table 1

6 |Bosch Buderus SSB255 | SSB399 | SSB512 Boilers Control Operations Guide

03.2018 |Bosch Thermotechnology Corp.

Data subject to change

3 Heating Modes

3.1 Central heating (CH) mode

There are 6 onboard CH Mode settings which may be selected with the SSB Boiler.

1. CH Mode = “0” [default mode] Setpoint control of the boiler using dry

contacts (TT)

2. CH Mode = “1” Outdoor Reset using ON/OFF control of the boiler using dry

contacts (TT)

3. CH Mode = “2” Full Outdoor reset with no heat demand

4. CH Mode = “3” Permanent Setpoint Demand

5. CH Mode = “4” Analog control (0-10Vdc) of set point temperature

6. CH Mode = “5” Analog control (0-10Vdc) of Boiler Power (%)

Central Heating Mode 0 [default mode]

(Setpoint control of the boiler using dry contacts #11 and #12)

CH Mode “0” - Boiler demand is generated thru a call for heat on low voltage contacts

#11 and #12 (dry contacts only). The Boiler will then target a temperature equal to

“CH Setpoint” (par.#3) at the Supply Temperature Sensor. If Temperature exceeds

the 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) 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°F or greater. As long as the call for heat remains the Boiler and

CH Pump contacts will remain energized. The Burner will remain oﬀ until temperature

falls to 130°F.

Central Heating

(CH)Mode Description Set these Parameters

Parameter # Description Default Range

CH Mode = “0” Setpoint control using dry

contacts (TT)

3 CH Setpoint 176°F 68 - 194°F

4 System pump overrun 300 sec. 0 – 900 sec.

5 Boiler pump overrun 300 sec. 0 – 900 sec.

7 CH Hysteresis 5.4°F 0 - 36°F

9 Anti-cycle period 180 sec. 10 – 900 sec.

10 Anti-cycle Temp Diﬀ 12.6°F 0 - 36°F

23 Design Supply Min 68°F 39.2 – 179.6°F

24 Design Supply Max. 194°F 80.6 - 194°F

Table 2

Control Operations Guide Bosch Buderus SSB255 | SSB399 | SSB512 Boilers | 7

Bosch Thermotechnology Corp. |03.2018 Data subject to change

Central Heating Mode 1

(On/Off with Outdoor Reset using dry contacts #11 and #12)

CH Mode “1” - Boiler demand is generated thru a call for heat on low voltage

contacts #11 and #12 (dry contacts only). Boiler will target a system supply water

temperature equal to the corresponding point on the installer programmed heating

curve. (See page 7 for details on how-to program the heating curve). If the System

Temperature sensor exceeds the calculated heating curve temperature by “CH

Hysteresis” (par.#7) the burner will shut oﬀ until the System Temperature sensor

reads “CH Hysteresis” below the target Setpoint Temperature.

Example:

Based on the heating curve programmed by the installer, the calculated supply water

temperature on a 32°F degree day outside 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°F or greater. As long as the call for heat remains

the Boiler and CH Pump contacts will remain energized. The Burner will remain oﬀ

until temperature measured at the system supply sensor falls to 130°F

Central Heating

(CH)Mode Description Set these Parameters

Parameter # Description Default Range

CH Mode = “1” On/Oﬀ with reset water

temperature

19 Design Supply °F 176°F 68 - 194°F

20 Design Outdoor °F 24.8°F -13 - 77°F

21 Baseline Supply °F 104°F 68 - 194°F

22 Baseline Outdoor °F 69.8°F 35.6 - 86°F

23 Design Supply min 68°F 39.2 – 179.6°F

24 Design Supply max 194°F 80.6 - 194°F

25 WWSD 69.8°F 35.6 - 95°F

26 Boost Temp Incr. 0°F 0 - 54°F

27 Boost Temp Delay 20 min. 1 – 120 min.

Table 3

8 |Bosch Buderus SSB255 | SSB399 | SSB512 Boilers Control Operations Guide

03.2018 |Bosch Thermotechnology Corp.

Data subject to change

Central Heating Mode 2

(Full Outdoor reset with no heat demand)

CH Mode“2” - Boiler demand is generated when the outdoor temperature falls

below the value of “Weather Setpoint” (par.#29). When this occurs the Boiler and

CH pump contacts are energized and the Boiler will target a system supply water

temperature corresponding to a point on the installer programmed heating curve.

(See “How to Program the Heating Curve” for details). If the System Temperature

sensor exceeds the calculated heating curve temperature by “CH Hysteresis”

(par.#7) the burner will shut oﬀ until the System Temperature sensor reads “CH

Hysteresis” below the target Setpoint Temperature. This CH Mode is for constant

circulation applications. The Boiler and CH pump contacts will remain energized

as long as the outdoor temperature is less than the value of “Weather Setpoint”

(par.#29). Using the low voltage contacts #11 and #12 it is possible to apply a

set-back to the heating curve. “Night Setback Dif” (par.# 28) controls the parallel

temperature shift that is applied to the curve when #11 and #12 contacts are

“closed” using a clock or switch.

Example:

“Weather Setpoint” is programmed for 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 “Weather Setpoint”, then the burner will turn

on when the Boiler Supply Temperature sensor (System Supply Temperature sensor

for cascade) reads a temperature of 130°F or less and will remain operating until

the outdoor temperature exceeds the value of “Weather Setpoint” or if the sensor

reads a temperature of 150°F or greater. As long as the outdoor temperature remains

below the value of “Weather Setpoint” the Boiler and CH Pump contacts will remain

energized. The burner will remain oﬀ until the system supply temperature falls to

130°F.

Central Heating

(CH)Mode Description Set these Parameters

Parameter # Description Default Range

CH Mode = “2” Full Outdoor reset

with no heat demand

19 Design Supply °F 176°F 68 - 194°F

20 Design Outdoor °F 24.8°F -13 - 77°F

21 Baseline Supply °F 104°F 68 - 194°F

22 Baseline Outdoor °F 69.8°F 35.6 - 86°F

23 Design Supply min 68°F 39.2 – 179.6°F

24 Design Supply max 194°F 80.6 - 194°F

25 WWSD 69.8°F 35.6 - 95°F

26 Boost Temp Incr. 0°F 0 - 54°F

27 Boost Temp Delay 20 min. 1 – 120 min.

28 Night Setback 18°F 0 - 90°F

29 Weather Setpoint 68°F 32 - 122°F

Table 4

Control Operations Guide Bosch Buderus SSB255 | SSB399 | SSB512 Boilers | 9

Bosch Thermotechnology Corp. |03.2018 Data subject to change

Central Heating Mode 3

(Permanent set point demand)

CH Mode“3” - Boiler demand is always “ON” in CH Mode 3 – “Permanent Demand

Mode”. In this mode the Boiler and CH Pump contacts will always be energized. When

the Supply Temperature Sensor falls below the value of “CH Setpoint” (par.#3)

minus the value of “CH Hysteresis” (par.#7), the burner will turn on. The burner

will remain on as long as the supply temperature remains below the value of “CH

Setpoint” plus “CH Hysteresis”. Using the low voltage contacts #11 and #12 it is

possible to apply a set-back to the “CH Setpoint” target temperature. “Night Setback

Dif” (par.# 28) controls the temperature shift that is applied to the “CH Setpoint”

when #11 and #12 contacts are “closed” using a clock or switch.

Example:

With both Boiler and CH Pump contacts energized, the boiler will monitor the Supply

Temperature Sensor. 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 evening the application calls for a reduced supply water

temperature of 120°F. A timer/clock is installed and wired to contacts #11 and #12

of the boiler and these contacts are “closed” between the hours of 10 pm and 5 am.

During that time period the “CH Setpoint” is reduced by the value programmed into

“Night Setback Dif”. In this example the value is set for 20°F.

Central Heating

(CH)Mode Description Set these Parameters

Parameter # Description Default Range

CH Mode = “3”

Permanent

Setpoint

Demand

3 CH Setpoint 176°F 68 - 194°F

4 System pump overrun 300 sec. 0 – 900 sec.

5 Boiler pump overrun 300 sec. 0 – 900 sec.

7 CH Hysteresis 5.4°F

9 Anti-cycle period 180 sec. 10 – 900 sec.

10 Anti-cycle Temp Diﬀ 12.6°F 0 - 36°F

24 Setpoint Max. 194°F 80.6 - 194°F

28 Night Setback 18°F 0 - 90°F

Table 5

10 |Bosch Buderus SSB255 | SSB399 | SSB512 Boilers Control Operations Guide

03.2018 |Bosch Thermotechnology Corp.

Data subject to change

Central Heating Mode 4

(Analog 0-10 Vdc Setpoint Control)

CH Mode“4” - Boiler demand is generated by a 0-10 Vdc analog signal from a

Building Management System (BMS). An initial heat request is generated via a

signal of 1.5 VDC or greater. Boiler modulation between “Design Supply Min”

(par.#23) and “Design Supply Max” (par.#24) will occur between 2 and 10 Vdc.

When a demand voltage of 1.5 VDC or greater is applied the Boiler and CH pump

contacts are energized and the Boiler will target a system supply water temperature

corresponding to the appropriate setpoint temperature based upon the voltage signal

and the minimum 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 BMS remains greater than 1 VDC.

Figure 1

OFF

1.0 1.5 2.0

Modulation

CH Setpoint Max

CH Setpoint Min

Voltage (Vdc)

Set Point F°

Central Heating

(CH)Mode Description Set these Parameters

Parameter # Description Default Range

CH Mode = “4” Analog 0-10 VDC

Setpoint Control

4 System pump overrun 300 sec. 0 – 900 sec.

5 Boiler pump overrun 300 sec. 0 – 900 sec.

7 CH Hysteresis 5.4°F 0 - 36°F

9 Anti-cycle period 180 sec. 10 – 900 sec.

10 Anti-cycle Temp Diﬀ 12.6°F 0 - 36°F

23 Design Supply Min 68°F 39.2 – 179.6°F

24 Design Supply Max. 194°F 80.6 - 194°F

Table 6

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