Application Brochure

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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A 261-3 03/09
Product design, software and literature are Copyright © 2009 by:
tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
Printed in Canada. A 261-3 03/09.
The Boiler Control 261 provides partial outdoor reset to a single boiler zone. The Setpoint Control 150 controls the temperature of the
pool or spa. The boilers are staged as required to provide the supply water temperature that satisfies the loads.
Heat Source Details The heat source can be high mass or low mass non-condensing boilers.
Piping Details A single boiler zone is permanently wired. The pool or spa heat exchanger is piped into the boiler loop and the flow is
controlled through a pump (P2). The boilers are piped in reverse return in order to provide equal flow through both boilers.
Setpoint Demand The Setpoint Control 150 cycles relay R1 in order to control the heat exchanger pump (P2) and maintain the pool or
spa temperature. When the 150 requires heat, it provides a Setpoint Demand to the 261 through relay R1. The 261 increases the boiler
temperature to at least the Setpoint setting.
Boiler Demand When the outdoor air temperature is below the Warm Weather Shut Down (WWSD) setting, the 261 turns on the boiler
pump (P1). 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 tempera-
ture 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.