Bedienungsanleitung Bosch Heatronic 4000 (Seite 8 von 60) (Englisch)

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Boiler Plant Operation

The Heatronic 4000 is able to operate up to four boilers to

maintain a boiler target temperature. Proportional, Integral &

Derivative (PID) logic is used in order to satisfy the boiler target

temperature for all plant configurations with the exception of

Dedicated Domestic Hot Water (DDHW). Proportional (P) logic

is used for DDHW. For proper operation of the boilers, the

Heatronic 4000 must be the only control that determines

when a boiler is to fire.

The boiler operator, or aquastat, remains in the burner circuit

& acts as a secondary upper limit on the boiler temperature.

The boiler aquastat temperature setting must be adjusted

above the Heatronic 4000’s boiler maximum setting in order

to prevent short cycling of the burner.

Boiler Operation

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

Single Stage On/Off Boiler

Once a boiler is required to operate, the control turns on the

Stage 1 relay. Once the control turns on the Stage 1 relay, it will

display the “Boiler” icon & “100%” under the respective boiler

output status in the display.

Two Stage On/Off Boiler

Once a boiler is required to operate, the control turns on the

Stage 1 relay. Once the Fire Delay time plus the Stage Delay

time has expired, the control can turn on the Stage 2 relay if it

is required. Once the control turns on the Stage 1 relay, it will

display the “Boiler” icon & “50%” under the respective boiler

output status in the display. Once the control turns on the Stage

2 relay, it will display “100%”.

Modulating Boiler

Once a boiler is required to operate, the control outputs an

analog signal corresponding to the Start Modulation setting

& then turns on the Stage 1 relay. Once the Fire Delay time

has expired, the modulating output is adjusted to the Minimum

Modulation setting. The control then holds the modulating output

at the Minimum Modulation until the Minimum Modulation Delay

time has elapsed. The control can then adjust the modulating

output from the Minimum Modulation as required. Once the

control turns on the Stage 1 relay, it will display the “Boiler”

under the respective boiler output status in the display. The

current firing rate is also displayed in the boiler output field.

EMS Boiler

Once a boiler is required to operate, the control outputs an

appropriate analog signal corresponding to the boiler target

temperature & then turns on the Stage 1 relay. Once the control

turns on the Stage 1 relay, it will display the “Boiler” under the

respective boiler output status in the display. The target water

temperature is also displayed in the boiler output field.

Boiler Target Temperature

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

The Boil TARG temperature is determined by the application

mode & the type of call received. The control displays the

temperature that it is currently trying to maintain at the boiler

supply sensor in the View menu. If the control does not presently

have a requirement for heat, it does not show a boiler target

temperature. Instead, “---” is displayed in the LCD.

Stage Delay

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

The STG DELAY is the minimum time delay between the firing

of each boiler or boiler stage. After this delay has expired the

control can fire the next boiler or boiler stage if it is required. This

setting can be adjusted manually or set to an automatic setting.

When the automatic setting is used, the control determines the

best stage delay based on the operation of the system.

Modulation Mode

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

When using multiple modulating boilers, a selection must be

made regarding the sequencing of the boilers. Two modulation

mode settings are provided considering condensing & non-

condensing boiler groups.

Modulation Mode is not available when the Application Mode

is configured for Dedicated Domestic Hot Water (DDHW).

MOD COND (Modulation Mode - Modulating, Condensing

Boiler Group)

This setting is applicable for a group at least two modulating,

condensing boilers.

MOD NC (Modulation Mode - Modulating, Non-Condensing

Boiler Group)

This setting is applicable for a group of at least two modulating,

non-condensing boilers.

Sequential Modulation (SEQ)

With Sequential Modulation, the control will turn on the fewest

boilers possible to meet the load. The control will bring a

boiler from its Minimum Modulation setting up to its Maximum

Modulation setting before bringing on another boiler. When

another boiler is turned on, the previous boiler will keep its

output at full fire.

100% 60% Off Off

Parallel Modulation (PAR)

With Parallel Modulation, the control will turn on the most

boilers possible to meet the load. The control will bring on the

first boiler at Minimum Modulation and does not increase its

modulation. If more boiler output is required, the second boiler

will turn on at Minimum Modulation and does not increase its

modulation. Additional boilers are turned on at their Minimum

Modulation setting until all boilers are on. If still more boiler

output is required, all boilers are modulated up in parallel until

they reach their Maximum Modulation settings.

40% 40% 40% 40%

Staging Mode Setup

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

When using multiple two-stage boilers, a selection must be

made regarding the staging order of the boilers. Two staging

modes are provided considering condensing & non-condensing

boiler groups.

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