Application Brochure

tekmar Control Systems Ltd., Canada
tekmar Control Systems, Inc., U.S.A.
Head Office: 5100 Silver Star Road
Vernon, B.C. Canada V1B 3K4
[phone] Fax. [phone]
Web Site: www.tekmarcontrols.com
Product design, software and literature are Copyright © 2010 by:
tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
8 of 8
All specifications are subject to change without notice.
Printed in Canada. A 132 - 04/10.
Application A132-4
System Operation:
The Boiler Control 262 provides partial or full outdoor reset to a boiler zone. The boilers operate at the required temperature in order to
satisfy the load. The 132 provides 2-stage pump operation to the 262.
Heat Source Details The heat source can be either high mass or low mass non-condensing or low temperature boilers.
Piping Details The boilers are piped using parallel primary / secondary in order to provide equal and isolated flow through each boiler.
The first stage and second stage pumps are piped in parallel in the system loop.
Boiler Demand When heat is required in the boiler zone, the boiler demand switch sends a Boiler Demand to the 262. The 262 then
sends a Pump Demand to the 132. 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 262 aims to increase the
boiler supply water temperature to at least the BOIL MIN setting.
Pump Demand When the 132 receives a Pump Demand, the 132 turns on the first stage pump.
2-Stage Demand When additional flow is required, the pressure differential switch closes and provides power to the 2-Stage Demand.
When a 2-Stage Demand is received, the second stage pump contact closes. The first stage and second stage pumps operate
simultaneously to provide flow in the system.
All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 132 and D 262.