Application Brochure

Product design, software and literature are Copyright © 2009 by:
tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
tekmar Control Systems Ltd., Canada
tekmar Control Systems, Inc., U.S.A.
Head Office: 4611 - 23rd Street
Vernon, B.C. Canada V1T 4K7
Tel. [phone] Fax. [phone]
Web Site: www.tekmarcontrols.com
Control Systems
System Operation
All specifications are subject to change without notice.
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System Operation
A 261-2 03/09
Printed in Canada. A 261-2 03/09.
The Boiler Control 261 provides partial or full outdoor reset to three (or more) boiler zones. The boilers are staged as required to provide
the supply water temperature that satisfies the load.
Heat Source Details The heat source can be either high mass or low mass non-condensing or low temperature boilers.
Piping Details Thermostat controlled zone pumps are piped off the boiler loop as a secondary loop. The boilers are piped using parallel
primary / secondary in order to provide equal and isolated flow through each boiler.
Boiler Demand When heat is required in the heating zones, the zone pump relays send a Boiler Demand to the 261. The boiler supply
water temperature is based on the Characterized Heating Curve settings. The boilers are staged to satisfy the required boiler supply
water temperature. Whenever the boilers are fired, the 261 aims to increase the boiler supply water temperature to at least the BOIL
MIN setting.
All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 261.