System Errors & Lockout Conditions (Continued)
High to Low Fire Purge Modulation Capability with High to Low Fire Position Switch Interlocks
4)Low fire fail (for modulating
5)High fire fail (for modulating
The following situations will result in a lockout condition:
6)Air failure (for purge and modulation models) – loss of combustion air anytime during the operational cycle. The Air Failure LED will be on for this condition. (See “Recycle Mode”).
7)Pilot flame fail (for all models) loss of flame during the trial for pilot ignition period. The Flame Failure LED will be on for this condition.
8)Main flame fail (for all models) loss of flame during the main burner trial for ignition or run period (recycling not selected). The Flame Failure LED will be on for this condition.
The following result in lockout conditions after 30 seconds, the system error light blinks about 14 times and then remains on:
9)If a flame is detected out of sequence, which may be caused by:
a)a faulty scanner (for all models);
b)electrical interference on the sensor wiring (for all models);
c)a flame exists in the burner or in the line of sight of a scanner, due to a gas leak, product fire or other condition (for all models).
10)Air flow switch closed before
For modulation models: the modulation feature incorporates a high fire purge time and a low fire purge time into the purge sequence. This feature allows the
The high fire and low fire purge times are selectable by means of DIP switches (see Section 3,“DIP Switch Settings” on page 12):
SW4 | 15 seconds | SW6 | ................................ 60 seconds |
SW5 | 30 seconds | SW7 | ............................. 120 seconds |
The selected times are additive and apply to both the high fire and low fire purge times (that is, high and low fire times are always identical).
The modulation terminals will sequence as follows:
Sequence Step | Internal Contact Connections | ||
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Power Off | Terminal 10 (Common) | Terminal 11 (Auto) | |
Power On, Limits Open | Terminal 10 (Common) | Terminal 12 (Low Fire) | |
Purge To High Fire | Terminal 10 (Common) | Terminal 13 | (High Fire) |
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Purge To Low Fire | Terminal 10 (Common) | Terminal 12 | (Low Fire) |
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Automatic Modulation | Terminal 10 (Common) | Terminal 11 | (Auto) |
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Alarm and Lockout | Terminal 10 (Common) | Terminal 12 | (Low Fire) |
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The Automatic step occurs when the burners are operating and allows the burner firing rate to be controlled by an automatic temperature controller.
Eclipse
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