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NORA Oilheat Technicians Manual

Carlin Specific Microprocessor-Based Primary Controls The following section is intended strictly as an overview. While other manufacturers may have similar controls, these are the units that you are most likely to encounter. Also, remember that manufacturers periodically add improvements and additional features to their controls. It is critical to consult product specific literature to verify information regarding individual controls, even if they are familiar to you. • Model numbers can be found just above the thermostat and flame detector terminals. • Wiring diagrams are to the left, and the controls timings are listed above the model number. • For example, this xxx has an xxsecond “trial for ignition” an xx-second recycle time, an x second “valve delay on,” an xx-second “trial for ignition,” and an xx-second “motor-delay-off.” • There may also be a revision designation printed on the lower right side of the label. Carlin’s microprocessor based controls, models 50200 and 60200 feature: Limited reset—also known as “Serviceman Reset Protection.” Once these controls go into lockout three consecutive times without establishing flame, the control will go into latch-up. In order to release them from latch-up, depress and hold the reset button. After 10 seconds, the two diagnostic lights will blink alternately. After another 20 seconds, the lights will stop blinking. Release the button to complete the reset procedure. Recycle-on-flame-failure—in the event of flame loss during the run cycle, within approximately two seconds the 50200 will shut the burner off and the 60200 will turn off power to the oil valve and complete a “motor-delay-off” cycle. After a wait of 60-90 seconds, the red LED light will flash for 65 seconds, then the control will attempt to restart the oilburner. If flame is established during the “trial for ignition” period, the burner will resume normal operation. If flame is not established in the “trial for ignition” period— the control will go into lockout. Diagnostic LEDs—these primary controls have two diagnostic LEDs: one red and one amber. • Amber-on signals that the control is in self-test. • Red-on indicates that the control is in lockout • Amber and red-on indicates that the control has locked out three times during a single call for heat and is in latch-up. • Red flashing indicates that flame has been lost during a run cycle, after trial for ignition. • Amber blinking-off every 3 to 4 seconds while the control is in the standby mode indicates that the cad cell is sensing light, or a diagnostic fault which disallows startup. Wiring Thermostat and cad cell leads connect to the appropriate terminals. Chapter 11 Primary Controls Model 50200 11-14 Primary Controls


NORA Oilheat Technicians Manual
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