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: 5100 Silver Star Road
Vernon, B.C. Canada V1B 3K4
Tel. (250) 545-7749 Fax. (250) 545-0650
Web Site: www.tekmarcontrols.com
Control Systems
System Operation
All specifications are subject to change without notice.
4 of 12
System Operation
A 360-2 03/09
Printed in Canada. A 360-2 03/09.
The Mixing Control 360 provides full outdoor reset to three (or more) mixed zones. The position of the injection valve is modulated to
provide a mixed supply water temperature to the zones, and protect the boiler from flue gas condensation. The boiler operates at the
required temperature in order to satisfy the load.
Heat Source Details The heat source can be either a high mass or low mass non-condensing boiler.
Piping Details Thermostat controlled zone valves are piped into the mixed loop. The injection valve is piped in primary / secondary in
order to isolate the boiler loop flow rate from the mixed loop flow rate. The boiler pump (P1) provides flow through the boiler and ensures
flow past the injection valve take-off.
Mixing Demand When heat is required in the mixed zones, the zone valve end switches send a
Mixing Demand
to the 360. The 360
turns on the mixing system pump (P2) and boiler pump (P1). The mixed supply water temperature is based on the
Characterized
Heating Curve
settings. The injection valve is then modulated to supply the required mixed supply water temperature. As the injection
valve opens and requires more heat from the boiler, the boiler is fired to a temperature that is sufficient to satisfy the requirements of the
injection valve. Whenever the boiler is fired, the 360 aims to maintain the boiler temperature above the BOIL MIN setting. While the boiler
is firing, the injection valve is also modulated to protect the boiler from excessively low water temperatures.
All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 360.