Submittal Sheet

Below is a sample application drawing for this product. This application may include other tekmar products that are required
for installation. More sample applications can be found at www.tekmarcontrols.com.
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Sample Electrical diagram
Sample Mechanical diagram
Product design, software and literature are Copyright © 20 by:
tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
2 of 2
All specifications are subject to change without notice.
Printed in Canada. C 257 - 0/.
tekmar Control Systems Ltd., Canada, tekmar Control Systems, Inc., U.S.A. 
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DHW Control 257
Two Stage
Item
Date Code
Power: 24 V ±10% 50/60 Hz 3 VA
Relays: 240 V (ac) 10 A 1/3 hp
tektra 906-11
Meets Class B:
Canadian ICES
FCC Part 15
Stage Mode Delay
Target DHW
DifferentialDHW
1 2 3 4
C R
7
Com
Sen
8
DHW
Sen
No Power
Signal wiring
must be rated
at least 300V
Made in Canada
Power Heat 1
5 6
H3014B
Heat 2
Rotate
On
Off
L
C
R
N
257
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