MODEL NUMBER NOMENCLATURE
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| 1 - 2 | 3 | 4 | 5 | |||
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| Family/Tier |
| Base Eff. |
| Htg. Stages |
| Major Series |
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| 91 | 5 |
| S |
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91 | - Legacy | 0 |
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92 | - Preferred |
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3 |
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98 | - Evolution | 5 |
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| 7 | S - Single Stage |
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| T - Two Stage |
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| M - Modulating |
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6 - 7 | 8 - 10 | 11 | 12 - 13 | 14 | 15 | 16 | |||||
Clg. Cap. |
| Htg. Cap. |
| Motor |
| Width |
| Voltage |
| Features | Minor Series |
30 | 040 |
| S | 14 |
| A | A | ||||
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24 | - 800 CFM | 14 - 14.2” |
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30 | - 1000 CFM | L - Low NOx | ||
17 - 17.5” | ||||
36 | - 1200 CFM | 21 - 21.0” | Voltage | |
42 | - 1400 CFM | |||
24 - 24.5” |
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48 | - 1600 CFM | 040=40,000 BTU |
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54 | - 1800 CFM | 060=60,000 BTU S - Standard |
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60 | - 2000 CFM | 080=80,000 BTU E - Energy Efficient |
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100=100,000 BTU V - Variable Speed |
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66 | - 2200 CFM |
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120=120,000 BTU |
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(@ 0.5” ESP) |
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140=140,000 BTU |
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Not all familes have these models.
915SA
A12042
FURNACE COMPONENTS
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GAS BURNER | IGNITER | MANUAL RESET | ||||||||||||||||
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| ROLLOUT SWITCH | |||||||||||||||
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FLAME
SENSOR
MANUAL RESET
ROLLOUT SWITCH
GAS VALVE |
OPERATING INSTRUCTIONS
NOT SHOWN (LOCATED ON
MAIN FURNACE DOOR, SEE
OPERATING INSTRUCTIONS
INSIDE DOOR FIGURE).
ELECTRICAL JUNCTION 
BOX (IF REQUIRED, 
LOCATION MAY VARY) 
MAIN LIMIT SWITCH (BEHIND GAS VALVE)
INDUCER MOTOR ASSEMBLY
BLOWER DOOR
SAFETY SWITCH
FURNACE
CONTROL 
BOARD
RATING PLATE NOT SHOWN
(LOCATED ON BLOWER DOOR)
MEDIA CABINET
BLOWER AND
MOTOR
CAPACITOR/ POWER CHOKE (IF USED)
REPRESENTATIVE DRAWING ONLY, SOME MODELS MAY VARY IN APPEARANCE.
A11408
4
