tekmar 256 Boiler Control - Manual (Page 19)

The control was unable to read a piece of information from its EEPROM. This error can be caused by a
noisy power source. The control will load the factory defaults and stop operation until all the settings are
verifi ed.
The control is no longer able to read the outdoor sensor due to a short circuit. In this case, the control
assumes an outdoor temperature of 32°F (0°C) and continues operation. Locate and repair the problem
as described in the Testing section. To clear the error message from the control after the sensor has been
repaired, press the Item button.
The control is no longer able to read the outdoor sensor due to an open circuit. In this case the control
assumes an outdoor temperature of 32°F (0°C) and continues operation. Locate and repair the problem
as described in the Testing section. To clear the error message from the control after the sensor has been
repaired, press the Item button.
The control is no longer able to read the boiler sensor due to a short circuit. In this case, if the BOIL MIN
adjustment is set to OFF the control does not operate the Boiler contact. If the BOIL MIN adjustment is
not set to OFF and a boiler demand is present, the Boiler contact will operate for up to 10 minutes of a 20
minute cycle. Locate and repair the problem as described in the Testing section. To clear the error message
from the control after the sensor has been repaired, press the Item button.
The control is no longer able to read the boiler sensor due to an open circuit. In this case, if the BOIL MIN
adjustment is set to OFF, the control does not operate the Boiler contact. If the BOIL MIN adjustment is
not set to OFF, and a boiler demand is present, the Boiler contact will operate for up to 10 minutes of a 20
minute cycle. Locate and repair the problem as described in the Testing section. To clear the error message
from the control after the sensor has been repaired, press the Item button.
Sensor Technical Data
Error Messages
Outdoor Sensor 070
Literature — D 070
Packaged weight — 0.35 lb. (160 g)
Enclosure
— Enclosure E, white PVC plastic
Dimensions — 4-1/2” H x 2-7/8” W x 1-1/2” D (73 x 114 x 38 mm)
Approvals — CSA C US, UL listed
Operating range — -60 to 140°F (-50 to 60°C)
Sensor —
NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C), ß=3892
Universal Sensor 071
Literature — D 071
Packaged weight — 0.08 lb. (35 g)
Enclosure
— Brass sleeve, 12” (300 mm) 20 AWG XLPE wire
Dimensions — 3/8” OD x 3/4” (9.5 OD x 19 mm)
Approvals — CSA C US, UL listed
Operating range — -60 to 255°F (-50 to 125°C)
Sensor —
NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C), ß=3892
19 of 20 © 2011 D 256 - 07/11
BOIL
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BOIL
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OUTDR VIEW
OUTDR VIEW
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