Bedienungsanleitung Bosch Heatronic 4000 (Seite 4 von 60) (Englisch)

555443

Zoom out

Zoom in

Vorherige Seite

1/60

Nächste Seite

Heatronic 4000 7738003455 (2014/04)4 of 60

Modulation Delay

---------------------------------

The MOD DELAY is the time that the boiler burner must hold

the modulation of the boiler at a minimum before allowing it to

modulate any further.

Boiler Mass

--------------------------------------

The Boil MASS setting selects the thermal mass characteristics

of each boiler. Operation of the boiler can become unstable if the

incorrect Boiler Mass setting is chosen. A key sign of unstable

boiler operation is that the flame will continue to increase & then

decrease in short periods of time. By choosing a lower boiler

mass setting, the boiler response will become more stable.

LOW (GB Series)

The LO setting is selected if the boiler that is used has a low

thermal mass. This means that the boiler has very small water

content & has very little metal in the heat exchanger. A boiler that

has a low thermal mass comes up to temperature quite rapidly

when fired. This is typical of many copper fin-tube boilers.

The Low mass setting (LO) provides a fast response to the

heating system.

MED

The MED setting is selected if the boiler that is used has a

medium thermal mass. This means that the boiler either has

a large water content & a low metal content or a low water

content & a high metal content. This is typical of many modern

residential cast iron boilers or steel tube boilers.

The Med mass setting provides a moderate response to the

heating system.

HI (SB and G Series)

The HI setting is selected if the boiler that is used has a high

thermal mass. This means that the boiler has both large water

content & a large metal content. A boiler that has a high thermal

mass is relatively slow in coming up to temperature. This is

typical of many commercial cast iron & steel tube boilers.

The Hi mass setting provides a slow response to the heating

system.

Low Fire & High Fire Boiler Output

---------------

In order to accommodate different boiler capacities in the

same system, a low fire & high fire boiler output for each boiler

can be set. This allows the control to properly operate the

boilers using either sequential or parallel modulation. Each

boiler typically has a rating plate that specifies the minimum

& maximum output. This information is also available in the

boiler manual.

The minimum & maximum boiler output is expressed in MBtu/h.

1 MBtu/h = 1,000 Btu / hour. The range is from 10 MBtu/h to

9,990 MBtu/h.

For example, if a boiler has a maximum output of 100,000

Btu / hr & a minimum output of 20,000 Btu / hr (turn down

ratio of 5):

Maximum Boiler Output = 100,000 = 100 MBtu/h

1,000

Minimum Boiler Output = 20,000 = 20 MBtu/h

1,000

Motor Speed

-------------------------------------

The MOTOR SPD is the amount of time the boiler requires to

go from 0% modulation to 100% modulation.

Gas valve actuating motors have a design time from fully

closed to fully opened which can be found in the manufacturer’s

manual. The Motor Speed should be set to this time.

The Motor Speed setting for a Variable Frequency Drive (VFD)

is the amount of time required to go from a stopped position

to 100% fan speed. Since a VFD has a very quick response

rate, it may be necessary to increase the Motor Speed setting

in order to increase the stability of the boiler modulation.

Start Modulation

-- - -- - -- - - - - - - -------------------

The START MOD setting is the lowest modulation output required

to obtain proper ignition. Whenever boiler operation is required,

the control outputs an analog signal corresponding to the Start

Modulation setting & closes the boiler contact to turn on the

burner. After the Fire Delay has elapsed & the burner is ignited,

the control modulates the firing rate between the Minimum

Modulation setting & the Maximum Modulation setting.

Minimum Modulation

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

The MIN MOD is the lowest signal the control can send to

modulate the boiler. This operates the boiler at low fire. Use the

MIN MOD setting in the Adjust Menu to select an appropriate

boiler minimum modulation.

Refer to the boiler manufacturer’s literature to determine

the minimum output voltage V (dc) or current (mA) that the

boiler will successfully operate at.

For 0 to 10 V (dc):

Minimum Modulation =

Boiler’s Minimum Input Signal

x 100%

10 V (dc)

For 4 to 20 mA:

Minimum Modulation =

Boiler’s Minimum Input Signal - 4mA

x 100%

16 mA

Example:

A boiler requires a 1.8 V (dc) signal to fire the boiler at low fire.

The boiler can be modulated to 10 V (dc) where it reaches

high fire.

Minimum Modulation = 1.8 V x 100% = 18%

10 V

Control’s

Output

Signal

Range

Boiler’s

Input

Signal

Range

100%

10 V (dc)

0 V (dc)

88%

Boiler’s

Minimum

Input

Signal

Minimum

Modulation

1.8 V (dc)

18%

•

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

Bosch Heatronic 4000 Seite 4

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Andere Handbücher von Bosch Heatronic 4000

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info