Table 2ÐAir Conditioning (A/C) Airflow Setup Switch Position
AIR CONDITIONER | AIRFLOW | A/C SWITCH POSITION |
| ALLOWABLE FURNACE MODEL SETUP |
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(TONS) | (CFM) | 040 | 060 | 080 |
| 080 |
| 100 |
| 120 | ||||
Default | 1200 or | OFF | OFF | OFF | 3 Tons | 3 Tons | 3 Tons | 5 | Tons | 5 | Tons | 5 | Tons | |
2000 | 1200 CFM | 1200 CFM | 1200 CFM | 2000 CFM | 2000 CFM | 2000 CFM | ||||||||
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600 | ON | OFF | OFF | X | X | X |
| Ð |
| Ð | Ð |
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2 | 800 | OFF | ON | OFF | X | X | X |
| X |
| X |
| X | |
1000 | ON | ON | OFF | X | X | X |
| X |
| X |
| X | ||
3 | 1200 | OFF | OFF | ON | X | X | X |
| X |
| X |
| X | |
1400 | ON | OFF | ON | X | X | X |
| X |
| X |
| X | ||
4 | 1600 | OFF | ON | ON | Ð | Ð | Ð | X |
| X |
| X |
| |
5 | 2000 | ON | ON | ON | Ð | Ð | Ð | X |
| X |
| X |
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XÐIndicates allowable selection.
Table 3ÐContinuous Fan (CF) Airflow Setup Switch Position
CONTINUOUS FAN | CF SWITCH POSITION |
| ALLOWABLE FURNACE MODEL SETUP |
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| 080 |
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(CFM) | 040 | 060 | 080 | 100 | 120 | |||||
(5 Ton) | ||||||||||
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Default | OFF | OFF | OFF | 565* | 515* | 690* | 690* | 860* | 1035* | |
600 | ON | OFF | OFF | X | X | X | Ð | Ð | Ð | |
800 | OFF | ON | OFF | X | X | X | X | X | X | |
1000 | ON | ON | OFF | X | X | X | X | X | X | |
1200 | OFF | OFF | ON | X | X | X | X | X | X | |
1400 | ON | OFF | ON | X | X | X | X | X | X | |
1600 | OFF | ON | ON | Ð | Ð | Ð | X | X | X | |
2000 | ON | ON | ON | Ð | Ð | Ð | X | X | X | |
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*Add 15% additional CFM when Bypass Humidifier switch
Table 4ÐTwo-Speed AC/HP Airflow Requirements (CFM)
OUTDOOR UNIT CAPACITY | 036 | 048 | 060 |
A/C Setting | 3 TonsÐ1200 | 4 TonsÐ1600 | 5 TonsÐ2000 |
CF Setting | 800 | 1000 | 1000 |
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Fault Code 24
SECONDARY VOLTAGE FUSE IS OPENÐIndicates fuse is open and there is a short in
STEP | ACTION | YES | NO | GO TO | |
1. | Turn power off and remove blower access panel. | Ð | Ð | 2 | |
2. | Is secondary voltage fuse blown? Check continuity to make sure. | 5 | 3 | Ð | |
3. | Replace furnace control board. | Ð | Ð | 4 | |
4. | Go to page number indicated in Index for CLEANUP AND | Ð | Ð | INDEX | |
5. | Disconnect all thermostat leads from furnace control board (including HUM terminal) and replace | Ð | Ð | 6 | |
secondary voltage fuse. | |||||
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6. | Depress door switch. Use a piece of tape to hold switch closed. | Ð | Ð | 7 | |
7. | Does Fault Code 24 flash? | 8 | 10 | Ð | |
8. | You have a short circuit in limit switch circuit. This includes limit switch, flame rollout switch, and | Ð | Ð | 9 | |
auxiliary limit switch. | |||||
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9. | Fix problem and replace secondary voltage fuse if necessary. | Ð | Ð | 4 | |
10. | Jumper R and W/W1 thermostat terminals on furnace control board. | Ð | Ð | 11 | |
11. | Does Fault Code 24 occur when W/W1 is energized? | 12 | 16 | Ð | |
12. | Disconnect jumper wire across R and W/W1 thermostat terminals and replace secondary voltage | Ð | Ð | 13 | |
fuse. | |||||
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13. | Disconnect PL2 from furnace control board and jumper R and W/W1 thermostat terminals on fur- | Ð | Ð | 14 | |
nace control board. | |||||
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14. | Does Fault Code 24 occur when W/W1 is energized? | 3 | 15 | Ð | |
15. | You have a short circuit in pressure switch circuit. | Ð | Ð | 9 | |
16. | Does Fault Code 24 occur when | 17 | 20 | Ð | |
17. | Disconnect PL2 from furnace control board. | Ð | Ð | 18 | |
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