Assessments - 2, GPA: 4.5
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• Remove jumper. iii. Simulate Ignition or Flame Failure: • Follow procedure to turn on burner. • Close hand valve in oil supply line. • Failure occurs, device enters Recycle Mode. Indicator light flashes at . Hz rate 2 seconds on, 2 seconds off). • Device tries to restart system after approximately 60 seconds. • After third Recycle Mode trial, safety switch locks out within safety switch timing indicated on label and control enters Restricted Mode. Indicator light flashes at 1 Hz rate (. second on, . second off). Ignition and motor stop and oil valves closes. iv. Cad Cell Check: See Figure 26. • If safety switch shuts down burner and resistance is above 1600 OHMS, open line switch to boiler. Access cad cell under ignitor, clean face of cad cell and see that cell is securely in socket. Check gasket around perimeter of ignitor lid for proper seal. If gasket is missing or damaged, replace gasket. Room light can effect cad cell resistance. Reset safety switch. • Close line switch to boiler. If burner starts and runs beyond safety switch cut-off time, cell is good. If not, install new cell. v. Power Failure Check: After Flame is established, turn the power off to the control/ burner. The burner should shut down safely. When power is restored a normal ignition sequence should be started. 3. WARNING — Check Pressure Limit Control — Jumper Thermostat Terminals. Allow burner to operate until shut-down by limit. Installation is not considered complete until this check has been made. WARNING Jumper must be removed after this check. Figure 6: Cad Cell Location 4. Check low water cut off control with water level at normal water line (see Figure 1). Raise thermostat setting to allow burner to operate. Open boiler drain to allow water level to drop to bottom of sight glass until burner operation is shut-down by low water cut-off. Close boiler drain and refill to normal water line. Burner should automatically restart during fill. Lower thermostat setting. 5. Check operating control on boiler equipped with tankless heaters. With burner off, draw hot water • Perform cad cell resistance check as until burner starts, then turn off hot water and check outlined in control feature. If resistance isburner shut-down. below 1600 OHMS and burner runs J. IF CONTROLS DO NOT MEET beyond safety cut-out time, cad cell is REqUIREMENTS outlined in Paragraph I., good. replace control and repeat checkout procedures. Important Product Safety Information Refractory Ceramic Fiber Product Warning: The Repair Parts list designates parts that contain refractory ceramic fibers (RCF). RCF has been classified as a possible human carcinogen. When exposed to temperatures about 1805°F, such as during direct flame contact, RCF changes into crystalline silica, a known carcinogen. When disturbed as a result of servicing or repair, these substances become airborne and, if inhaled, may be hazardous to your health. AVOID Breathing Fiber Particulates and Dust Precautionary Measures: Do not remove or replace RCF parts or attempt any service or repair work involving RCF without wearing the following protective gear: 1. A National Institute for Occupational Safety and Health (NIOSH) approved respirator 2. Long sleeved, loose fitting clothing 3. Gloves 4. Eye Protection • Take steps to assure adequate ventilation. • Wash all exposed body areas gently with soap and water after contact. • Wash work clothes separately from other laundry and rinse washing machine after use to avoid contaminating other clothes. • Discard used RCF components by sealing in an airtight plastic bag. RCF and crystalline silica are not classified as hazardous wastes in the United States and Canada. First Aid Procedures: • If contact with eyes: Flush with water for at least 15 minutes. Seek immediate medical attention if irritation persists. • If contact with skin: Wash affected area gently with soap and water. Seek immediate medical attention if irritation persists. • If breathing difficulty develops: Leave the area and move to a location with clean fresh air. Seek immediate medical attention if breathing difficulties persist. • Ingestion: Do not induce vomiting. Drink plenty of water. Seek immediate medical attention. SECTION Ix: MAINTENANCE AND SERVICE INSTRUCTIONS A. MAINTENANCE OF LOW WATER CUTOFF DEVICES WARNING Probe and float type low water cut-off devices require annual inspection and maintenance. 1. PROBE TYPE LOW WATER CUT-OFF Although these devices are solid state in their operation, the probe is exposed to possible contamination in the boiler water and subject to fouling. It is important to physically remove the probe from the boiler tapping annually and inspect that probe for accumulation of scale or sediment. Follow these steps to inspect, clean and/or replace the probe: a. Turn off electric service to the boiler. b. Drain boiler water to a level below the tapping for the probe. c. Disconnect wiring connections between the low water cut-off control and the probe. d. Remove the ...
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