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Applications Manual
5 Recommended Specifi cations
The following are the recommended specifi cations for the
Boiler 4000 Control:
The control shall be capable of sequencing up to four
single stage, two stage and modulating boilers, or two
dual fuel boilers. Plus a combination of one dual fuel and
two single stage, two stage, modulating boilers.
The control shall be capable of operating combinations of
condensing & non-condensing boilers.
The control shall be capable of adjusting the boiler plant
target to provide indirect domestic hot water heating
with priority.
The control shall have the ability to calculate the boiler
plant target temperature based on outdoor temperature
reset.
The control shall have the ability to set the boiler plant
target temperature using an adjust able setpoint.
The control shall have the ability to set the boiler plant
target temperature as directed by a BAS, BMS or EMS.
The control shall have an adjustable warm weather shut
down applied to outdoor temperature reset operation.
The control shall be able to operate two primary pumps
in standby mode.
The control shall have the options of a proof demand
input or a flow sensor input to prove flow for the primary
pump.
The control shall provide an alert output for flow proof,
CA proof & no heat failures.
The control shall be able to operate one primary pump
& one domestic hot water pump during a domestic hot
water call.
The control shall communicate with Modbus
IP & tekmarNet
systems to provide remote monitoring &
®
adjustment.
The control shall have the ability to display the current
temperature difference between the return temperature
& the supply temperature, ΔT.
The control shall have the option to measure fluid
pressure & flow rates.
The control shall have an option to rotate the boilers
& primary pumps based on the accumulated running
hours.
The control shall display the run time of the boilers &
optionally, primary pumps.
The control shall use proportional, integral & derivative
(PID) logic when modulating the boilers.
The control shall have the option to modulate the boilers
sequentially or in parallel.
Bosch Thermotechnology Corp.
The control shall have an adjustable minimum supply
water temperature setting to help prevent condensation
of flue gases & subsequent corrosion & blockage of the
boiler's heat exchanger & chimney.
The control shall have the option of an automatic
differential calculation in order to prevent short cycling of
the boilers.
The control shall have the ability to operate individual
boiler pumps.
The control shall have adjustable post purge settings that
allow the primary & boiler pumps to run for a set period
after the boiler has been shut off.
The control shall have the option for fixed lead & fixed
last boiler rotation.
The control shall have the option to prove & operate a
combustion air damper output.
The control shall have an adjustable minimum inter-
stage delay that can be set manually or calculated by
the control.
The control shall have the option of accepting a 0 – 10 V
(dc) or 2 – 10 V (dc) input signal from an energy manage-
ment system with an adjustable offset.
The control shall have three separate lockable access
levels (Advanced, Installer, User) to limit the number of
setting adjustments available to various users.
The control shall have manual override options to test
boiler & pump operation, suspend boiler plant operation,
operate pumps for purging & operate the system with a
maximum heat output.
The control shall have the ability to display the current
outdoor, boiler supply, return & inlet temperatures.
®
, BACnet
®
The control shall continually monitor the temperature
sensors & provide an error message upon a control or
sensor failure.
During extended periods of inactivity, all pumps shall be
periodically exercised to prevent seizure during long idle
periods.
The control shall include a setback schedule that can
be used by the control itself or shared with other tN4
devices.
The control shall have the option to operate as a tN4
system control with a tN4 boiler bus.
The control shall display the current % modulation of
each boiler, or the number of stages fired.
The control shall include an adjustment for the cycle
length if connected to a tN4 network.
Bosch Heatronic 4000 Controls | 27
Data subject to change
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