tekmar 257 DHW Control User Manual
Data brochure, D 257, Dhw control 257
1
of
12
©
2009 D
257
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03/09
D 257
03/09
- Data Brochure
DHW Control 257
The DHW Control 257 is used for dedicated domestic hot water systems. The control operates two on/off boilers, or one
two-stage boiler to maintain the DHW Target temperature at the DHW Sensor. The control can operate in Proportional (P)
mode, or Proportional, Integral, Derivative (PID) mode.
Additional functions include:
Boiler rotation
Cumulative boiler run time hours
P or PID staging modes of operation
CSA and UL certified for use in the USA and Canada
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DHW Control 257
Two Stage
Item
Dat
e 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
Differential
DHW
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
H30
14
B
Heat 2
Rotate
On
Off
Input
Universal Sensor
Included
Output
Boiler
Output
Boiler
Input
24 V (ac)
Power Supply
- 032 Timer (4 pages)
- 033 4 Timer (12 pages)
- 040 RDM (4 pages)
- 054 RTU (2 pages)
- 055 RTU (2 pages)
- 060 RTU (2 pages)
- 062 RTU (4 pages)
- 063 RTU (8 pages)
- 070 Outdoor Sensor (4 pages)
- 071 Universal Sensor (4 pages)
- 072 10k Slab Sensor (2 pages)
- 073 10k Slab Sensor (2 pages)
- 076 Indoor Sensor (4 pages)
- 077 Indoor Sensor (4 pages)
- 078 Universal Sensor (4 pages)
- 079 Slab Sensor (4 pages)
- 081 Three Outdoor Sensor Module (4 pages)
- 082 Universal Sensor (4 pages)
- 083 Duct Sensor (4 pages)
- 084 Indoor Sensor (4 pages)
- 085 10k Solar Sensor (2 pages)
- 086 Humidity & Temperature Sensor (8 pages)
- 090 Snow/Ice Sensor (8 pages)
- 095 Snow Sensor (8 pages)
- 150 One Stage Setpoint Control (4 pages)
- 152 Two Stage Setpoint Control (4 pages)
- 153 Mixing Setpoint Control (4 pages)
- 155 Difference Setpoint Control (4 pages)
- 156 Difference Setpoint Control (12 pages)
- 157 Difference Setpoint Control (16 pages)
- 161 Setpoint Control Installation (36 pages)
- 161 Setpoint Control User Manuals (12 pages)
- 162 Setpoint Control Installation (32 pages)
- 162 Setpoint Control User Manuals (12 pages)
- 256 Boiler Control (20 pages)
- 260 Boiler Control (20 pages)
- 261 Boiler Control (20 pages)
- 262 Boiler Control Installation (36 pages)
- 262 Boiler Control User Manuals (4 pages)
- 263 Boiler Control (36 pages)
- 264 Boiler Control (32 pages)
- 265 Boiler Control (36 pages)
- 268 Boiler Control (32 pages)
- 269 One Stage Steam Control (12 pages)