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Control Description
The Boiler Control 268 is a microprocessor-based nine stage boiler control. The 268 can provide either outdoor reset and setpoint operation or outdoor reset and DHW operation. The 268 stages and has Equal Run Time Rotation of the boilers and also operates the system pump and individual boiler pumps. One, two, three and four stage on / off boilers can be operated. The 268 also has options for fixed lead and fixed last rotation sequences. A contact is also available for either a combustion air damper or external alarm. The control can provide outdoor reset using an outdoor sensor or the control can accept a 0 -10 V (dc) signal from an EMS / BAS to establish the required water temperature.
Literature: D 268, A 268's, D 001, D 070
Control: Microprocessor PID control; This is not a safety (limit) control
Packaged Weight: 3.3 lb. (1500 g), Enclosure A, blue PVC plastic
Dimensions: 6-5/8" H x 7-9/16" W x 2-13/16" D (170 x 193 x 72 mm)
Approvals: CSA C US, meets ICES & FCC regulations for EMI/RFI
Ambient Conditions: Indoor use only, 32 to 122+F (0 to 50+C), < 90% RH non-condensing
Power Supply: 115 V (ac) +10% 50/60 Hz 600 VA
Relays: 230 V (ac) 5 A, 1/3 hp, pilot duty 230 VA
Demands: 20 to 260 V (ac) 2 VA
Sensors Included: NTC thermistor, 10 kΩ @ 77+F (25+C +0.2+C) +=3892 Outdoor Sensor 070 and 2 of Universal Sensor 071
Optional Devices: tekmar type #: 032, 071
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Multiple Boilers


9 Boiler

Width (Inches):




User Interface:

Push Button




Depth (Inches):


Ambient Conditions:

Indoor Only: 32°-122°F < 90% RH non-condensing

Power Supply:

115V (ac)


230 V (ac) 5 A-1/3 hp- pilot duty 240 VA

Min Temp (F):


Max Temp (F):


Temperature Range (F):

60°F - 220°F


Microprocessor PID control

Weight (lbs):

3.3 lbs


20 to 260 V (ac) 2 VA


NTC Thermistor 10 k ohm @ 77°F


0-20 mA / 4-20 mA (up to 1000 ohm load)


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