Troubleshooting: Heating Sequence of Operation (Continued)
CALL FOR HIGH FIRE WITH TWO−STAGE THERMOSTAT
21
2Stage Thermostat
1st Call for High Fire?
YES NO
2nd Stage Recognition Delay (30 Seconds)
Combustion Air Inducer ON
(100% Rate Speed)
High |
| |
Pressure Switch | NO | |
Closes Within | ||
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10Seconds?
YES
Adjust Indoor
Blower to
Appropiate speed
Increase Combustion |
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| Error Code |
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Air Inducer Speed |
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| Flashes |
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if Not at 100% |
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Rate Speed |
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Wait 5
Minutes
3A | Wait for Call for Heat Satisfied |
1System will always light at 70% even if 2nd stage call for heat is in place
2If the high pressure switch does not close within 5 attempts, the system will operate at low fire for the remainder of the call for heat at request
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