Tekmar 257 Control – Domestic Hot Water – Two Stage

Description

Tekmar 257 Control – Domestic Hot Water – Two Stage

Features:

• 2 stage control
• Proportional or PID staging
• Equal runtime rotation
• Cumulative boiler run time hours

Specifications:

• Agency Approvals – CSA C US, meets class B: ICES & FCC Part 15
• Ambient Conditions – Indoor use only, -20 to 120 degrees F (-30 to 50 degrees C), RH less than or equal to 90 percent Non-condensing
• Control Type – Microprocessor control, this is not a safety (limit) control
• Dimensions – 4-3/4″ x 2-7/8″ x 7/8″ (120 x 74 x 22 mm)
• Enclosure Material – White PVC plastic
• Enclosure NEMA Rating – NEMA 1
• Hydronic – HVAC Control Type – DHW Control
• Power Supply – 24 V (ac) plus / minus 10 percent, 50/60 Hz, 3 VA
• Relay – 240 V (ac) 10 A max, 1/3 hp
• Sensor – NTC thermistor, 10 k ohms at 77 degrees F (25 degrees C plus / minus 0.2 degrees C) Beta=3892

Installation Manual