21.2 49,000 Temperature °F Value in resistance 24.8 45,000 (1 0f 2) 78.8 11,900 28.4 40,500 82.4 10,850 32 36,000 86 9,800 35.6 33,500 89.6 9,100 39.2 30,900 68 15,000 42.8 28,200 71.6 14,000 E-18 error 46.4 25,600 75.2 12,900 50 23,000 78.8 11,900 53.6 21,400 82.4 10,850 57.2 19,900 86 9,800 60.8 18,100 89.6 9,100 64.4 16,600 93.2 8,500 68 15,000 96.8 7,900 71.6 14,000 100.4 7,200 75.2 12,900 104 6,500 indicates that the T1 Supply 113 5,600 Temperature sensor has read a value 122 4,600 of more than 212°F. 131 4,000 Verify the current supply temperature with a digital 140 3,400 clamp-on thermometer connected to the supply 158 2,300 pipe directly below the heat exchanger. 176 1,700 Disconnect the Molex connector at the 194 1,300 T1 supply sensor, this sensor reads 12K ohms at 77 °F. See resistance value chart next page for proper temperature and values at other temperatures. Using a digital multimeter, read the resistance value of your sensor and confirm your reading with the chart on page 2. If the resistance value is much higher or lower than the actual temperature per the resistance chart, replace the sensor. Reconnect the Molex connector to the sensor if resistance value is correct. Ensure that there is no air present in the heat exchanger or heating loops. Check the air vent on the boiler heat exchanger for any signs of corrosion, replace if defective. Purge/bleed any heating loops in the system.
21.2 49,000 24.8 45,000 28.4 40,500 32 36,000 35.6 33,500 39.2 30,900 42.8 28,200 46.4 25,600 50 23,000 53.6 21,400 57.2 19,900 60.8 18,100 64.4 16,600 68 15,000 71.6 14,000 75.2 12,900 Temperature °F Value in resistance 78.8 11,900 82.4 10,850 86 9,800 89.6 9,100 68 15,000 71.6 14,000 75.2 12,900 78.8 11,900 82.4 10,850 86 9,800 89.6 9,100 93.2 8,500 96.8 7,900 100.4 7,200 104 6,500 113 5,600 122 4,600 131 4,000 140 3,400 158 2,300 176 1,700 194 1,300 (1 0f 2) E-18 error indicates that the T1 Supply Temperature sensor has read a value of more than 212°F. Verify the current supply temperature with a digital clamp-on thermometer connected to the supply pipe directly below the heat exchanger. Disconnect the Molex connector at the T1 supply sensor, this sensor reads 12K ohms at 77 °F. See resistance value chart next page for proper temperature and values at other temperatures. Using a digital multimeter, read the resistance value of your sensor and confirm your reading with the chart on page 2. If the resistance value is much higher or lower than the actual temperature per the resistance chart, replace the sensor. Reconnect the Molex connector to the sensor if resistance value is correct. Ensure that there is no air present in the heat exchanger or heating loops. Check the air vent on the boiler heat exchanger for any signs of corrosion, replace if defective. Purge/bleed any heating loops in the system.
2016%20Boiler%20Knowledge%20Base%2004152016GW.docx