Manual Bosch Heatronic 4000 (page 9 of 60) (English)

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Heatronic 40007738003455 (2014/04) 9 of 60

STG COND (Staging Mode - Two-Stage, Condensing Boiler

Group)

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

condensing boilers.

STG NC (Staging Mode - Two-Stage Non-Condensing

Boiler Group)

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

non-condensing boilers.

Lo/Hi

If the Lo/Hi staging option is selected the control stages in

sequence all of the stages in a single boiler. Once all of the

stages are turned on, the control then stages in sequence all

of the stages of the next boiler in the rotation sequence.

Lo/Lo

If the Lo/Lo staging option is selected, the control stages all of the

Lo stage outputs in all of the boilers first. Once all of the boilers

are operating on their Lo stages, the control then operates the

second stage in each boiler in the same order.

Boiler Group Rotation

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

The control has two rotation settings including one for the

condensing boiler group & another for the non-condensing

boiler group.

ROT COND (Rotation - Condensing Boiler Group)

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

condensing boilers.

ROT NC (Rotation - Non-Condensing Boiler Group)

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

non-condensing boilers.

The Rotate feature changes the firing order of the boilers

whenever one boiler accumulates 48 hours more run time than

any other boiler. Rotation will be forced if any boiler accumulates

60 hours more run time. After each rotation, the boiler with the

least running hours is the first to fire & the boiler with the most

running hours is the last to fire. This function ensures that all of

the boilers receive equal amounts of use. When the Rotation

setting is set to Off, the firing sequence always begins with

lowest boiler to the highest boiler.

720 hours

1 2

672 hours

720 hours

2 1

672 hours

To reset the rotation sequence, clear the Burner Run Time in

the Monitor (#) Menu.

Boiler Run Time Monitoring

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

The running time of each boiler is logged in its respective Monitor

(#) menu. To reset the running time, select the appropriate

BURNER item in the Monitor (#) menu & select CLEAR until

“0” is displayed.

Fixed Lead

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

When the boiler plant includes only one boiler group, either a

condensing or a non-condensing group, a selection must be

made regarding operation of the lead boiler.

In some applications, it may be desirable to have the first boiler

fire first at all times while the firing sequence of the remain-

ing boilers is changed using Equal Run Time Rotation. This

configuration is typical of installations where the boiler plant

•

includes similar boilers but the first boiler is required to be

the first to fire in order to establish sufficient draft for venting.

With a fixed lead rotation, the lead boiler is always turned on

first & turned off first. The Fixed Lead is always applied to the

boiler 1 output.

OFF

The lead boiler is not fixed to operate first in the firing sequence.

It is included in the rotation sequence with the other boilers.

Fixed Last

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

When the boiler plant includes only one boiler group, either a

condensing or a non-condensing group, a selection must be

made regarding operation of the last boiler.

In some applications, it may be desirable to have the last

boiler fire last at all times while the firing sequence of the

remaining boilers is changed using Equal Run Time Rotation.

This configuration is typical of installations where the boiler

plant includes higher efficient boilers & a single lesser efficient

boiler. The lesser efficient boiler is only desired to be operated

when all other boilers in the plant are on & the load cannot be

satisfied. With a fixed last rotation, the last boiler is the last to

turn on & the first to turn off. The Fixed Last is always applied

to the boiler 4 output.

OFF

The last boiler is not fixed to operate last in the firing sequence.

It is included in the rotation sequence with the other boilers.

Condensing & Non-Condensing Boiler Groups

- - -

Operating a boiler plant that contains both condensing (high

initial cost) & non-condensing (lower initial cost) boilers allows

the boiler plant to achieve nearly the same operating efficien-

cies as operating all condensing boilers but at a much lower

installed cost to the building owner. High system efficiency can

be achieved as long as the condensing boilers are the first to

operate in the firing sequence. During mild weather, the lead

condensing boilers operate at lower boiler temperatures &

achieve their peak boiler efficiencies while the non-condensing

boilers are rarely operated. During very cold weather, the boiler

target temperature is often above the boiler’s condensation

point & the condensing & non-condensing boilers operate

together at roughly the same efficiency level.

When a condensing boiler is operating, it is desirable to operate

the boilers without a boiler minimum temperature being applied

to the boiler target. This allows the condensing boiler to operate

at its maximum efficiency. When a non-condensing boiler is

operating, a boiler minimum temperature should be applied to the

boiler target to prevent damage to the non-condensing boiler’s

heat exchanger from sustained flue gas condensation.

The Heatronic 4000 supports operation of a condensing & a

non-condensing boiler group. A condensing boiler group is

created when at least one boiler is selected to be condensing

& a non-condensing boiler group is created when at least

one boiler is selected to be non-condensing. The condensing

boiler group is always sequenced on first, followed by the

non-condensing boiler group.

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