Application Brochure

Product design, software and literature are Copyright ©2013 by
tekmar Control Systems Ltd., A Watts Water Technologies Company
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All specifications are subject to change without notice.
Printed in Canada. 284_A - 02/13.
tekmar Control Systems Ltd., A Watts Water Technologies Company. Head Offi ce: 5100 Silver Star Road,
Vernon, B.C. Canada V1B 3K4, 250-545-7749, Fax. [phone] Web Site: www.tekmarControls.com
Specifications
The following are the recommended specifications for the Boiler Control 284
The control shall be capable of sequencing up to four single stage, two stage or 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 adjustable 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
®
, BACnet
®
& 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, T.
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.
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 management 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, outlet, return & inlet temperatures.
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.
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