As an Omaha heating & cooling contractor, we work on roof top units which are common units that provide heating and cooling for commercial applications in the Omaha metro area. The model number description for this blog is for Trane RTU Model Number Description decoding 3 to 10 tons (T/Y – 17 SEER Plus). NOTE: This information has not been certified by the manufacturer. ENSURE that you verify all of this model number information with the manufacturer before using this information to make equipment selection or repair decisions.
Trane RTU Model Number Descriptions 3 to 10 tons (T/Y – 17 SEER Plus)
Digit 1 – Unit Type
T DX Cooling
Y DX Cooling, Gas Heat
Digit 2 – Efficiency
S Standard Efficiency
H High Efficiency
Digit 3 – Airflow
Digit 4, 5, 6 – Nominal Gross Cooling Capacity (MBh)
037 3 Ton (17 SEER)
047 4 Ton (17 SEER)
067 5 Ton (17 SEER)
Digit 7 – Major Design Sequence
E R-410 Refrigerant
Digit 8 – Voltage Selection
Digit 9 – Unit Controls
R ReliaTel Microprocessor
Digit 10 – Heating Capacity
Note: The below are applicable to Digit 1, T models only
0 No Electric Heat
B 6kW (3 phase)
E 12kW (3 phase)
G 18kW (1&3 phase)
J 23kW (3 phase)
Note: The below are applicable to Digit 1, Y models only
L Low Heat
M Medium Heat
H High Heat
X Low Heat, Stainless Steel Heat Exchanger
Y Medium Heat, Stainless Steel Heat Exchanger
Z High Heat, Stainless Steel Heat Exchanger
Digit 11 – Minor Design Sequence
A First Sequence 
Digit 12, 13 – Service Sequence
** Factory Assigned
Digit 14 – Fresh Air Selection
0 No Fresh Air
A Manual Outside Air Damper 0-50% 
B Motorized Outside Air Damper 0-50%
C Economizer, Dry Bulb 0-100% without Barometric Relief 
D Economizer, Dry Bulb 0-100% with Barometric Relief 
E Economizer, Reference Enthalpy 0-100% without Barometric Relief 
F Economizer, Reference Enthalpy 0-100% with Barometric Relief 
G Economizer, Comparative Enthalpy 0-100% without Barometric Relief 
H Economizer, Comparative Enthalpy 0-100% with Barometric Relief 
K Low Leak Economizer with Barometric Relief
M Low Leak Economizer with Reference Enthalpy with Barometric Relief
P Low Leak Economizer with Comparative Enthalpy with Barometric Relief
Digit 15 – Supply Fan/Drive Type/Motor
0 Standard Drive 
6 Single Zone VAV 
E VAV Supply Air Temperature Control Standard Motor 
Digit 16 – Hinged Service Access/Filters
0 Standard Panels/Standard Filters
A Hinged Access Panels/Standard Filters
B Standard Panels/2” Merv 8 Filters
C Hinged Access Panels/2” Merv 8 Filters
D Standard Panels/2” Merv 13 Filters
E Hinged Access Panels/2” Merv 13 Filters
Digit 17 – Condenser Coil Protection
0 Standard Coil
1 Standard Coil with Hail Guard
2 Black Epoxy pre-Coated Condenser Coil
3 Black Epoxy pre-Coated Condenser Coil with Hail Guard
4 CompleteCoat Condenser Coil
5 CompleteCoat Condenser Coil with Hail Guard
Digit 18 – Through-the-Base Provisions
0 No Through-the-Base Provisions
A Through-the-Base Electric 
B Through-the-Base Gas Piping 
C Through-the-Base Electric and Gas Piping 
Digit 19 – Disconnect/Circuit Breaker (three-phase only)
0 No Disconnect/No Circuit Breaker
1 Unit Mounted Non-Fused Disconnect 
2 Unit Mounted Circuit Breaker 
Digit 20 – Convenience Outlet
0 No Convenience Outlet
A Unpowered Convenience Outlet
B Powered Convenience Outlet (three-phase only) 
Digit 21 – Communication Options
0 No Communications Interface
2 LonTalk Communications Interface
3 Novar 2024 Controls
4 Novar 3051 Controls Without Zone Sensor
5 Novar 3051 Controls Interface with DCV
6 BACnet Communications Interface
7 Air-Fi Wireless Communications 
Digit 22 – Refrigeration System Options
0 Standard Refrigeration System8
B Dehumidification Option 
Digit 23 – Refrigeration Controls
Note: The below are applicable to Digit 7 = E
0 No Refrigeration Control 
2 Crankcase Heater 
3 Frostat and Crankcase Heater 
Digit 24 – Smoke Detector 
0 No Smoke Detector
A Return Air Smoke Detector [9, 10]
B Supply Air Smoke Detector
C Supply and Return Air Smoke Detectors
D Plenum Smoke Detector
Digit 25 – System Monitoring Controls
0 No Monitoring Control 
1 Clogged Filter Switch 
2 Fan Failure Switch 
3 Discharge Air Sensing Tube 
4 Clogged Filter Switch and Fan Failure Switch 
5 Clogged Filter Switch and Discharge Air Sensing Tube 
6 Fan Failure Switch and Discharge Air Sensing Tube 
7 Clogged Filter Switch, Fan Failure Switch and Discharge Air Sensing Tube 
8 Novar Return Air Sensor (NOVAR 2024) [12, 20]
9 Novar Zone Temp Sensor (NOVAR 3051) [15, 20]
A Condensate Drain Pan Overflow Switch
B Clogged Filter Switch  and Condensate Drain Pan Overflow Switch
C Fan Failure Switch  and Condensate Drain Pan Overflow Switch
D Discharge Air Sensing  and Condensate Drain Pan Overflow Switch
E Clogged Filter Switch , Fan Failure Switch  and Condensate Drain Pan Overflow Switch
F Clogged Filter Switch , Discharge Air Sensing Tube  and Condensate Drain Pan Overflow Switch
G Fan Failure Switch  Discharge Air Sensing Tube  and Condensate Drain Pan Overflow Switch
H Clogged Filter Switch , Fan Failure Switch  Discharge Air Sensing  and Condensate Drain Pan Overflow Switch
Digit 26 – System Monitoring Controls
0 No Monitoring Controls
A Demand Control Ventilation (CO2) [18, 19]
B Low Leak Economizer with FDD (Fault Detection & Diagnostics)
C FDD (Fault Detection & Diagnostics) with DCV (Demand Control Ventilation)
Digit 27 – Unit Hardware Enhancements
0 No Enhancements
1 Stainless Steel Drain Pan
Digit 31 – Advanced Unit Controls
0 Standard Unit Controls
1 Human Interface
Model Number Notes
1 Standard on all variable stage units.
2 Manual outside air damper will ship factory supplied within the unit, but must be field installed.
3 High pressure control is standard on all units.
4 Direct drive is standard for 3 to 5 ton variable stage units.
Digit 15 = 0, 6
3 Phase (3 to 5 Ton) – High Efficiency Constant CFM
5 Economizer with Barometric Relief is for downflow configured units only. Order economizer without Barometric Relief for horizontal configuration. Barometric Relief for horizontal configured units must be ordered as field installed accessory.
6 Through-the-base electric required when ordering disconnect/circuit breaker options.
7 Requires use of disconnect or circuit breaker.
3 to 5 Tons w/Standard Indoor Motor w/460V or 575V
8 Standard metering devices are TXVs.
9 The return air smoke detector may not fit up or work properly on the Precedent units when used in conjunction with 3rd party accessories such as bolt on heat wheels, economizers and power exhaust. Do not order the return air smoke detectors when using this type of accessory.
10 Return Air Smoke Detector cannot be ordered with Novar controls.
11 These options are standard when ordering Novar controls.
12 This option is used when ordering Novar controls.
13 Includes gas piping and shutoff (field assembly required).
14 Not available with high temperature duct sensor accessory.
15 Novar sensor utilized with Digit 21 = (4) Novar 3051 controls without zone sensor.
16 Available for T/Y 3, 4, 5 ton high efficiency models.
17 Requires selection of 2” pleated filters (option B or C) for Digit 16.
18 Not available on all single phase or standard efficiency.
19 Demand Control Ventilation Option includes wiring only. The CO2 sensor is a field-installed only option.
20 Novar is not available with SZVAV products.
Additional information and product literature is available from the Trane website. The website may offer additional information above and beyond the Trane 17 SEER RTU model number decoding information provided in this blog.
For information on the description of Trane furnace model numbers, refer to this blog. For a description of Armstrong furnace model numbers, refer to this blog. These other blogs contain information on units other than Trane 17 SEER RTU model number decoding.
For technical material on troubleshooting a low voltage transformer failure, refer to this blog.
For information on how to properly connect the primary side of a low voltage transformer on roof top units, refer to this blog.
As a trusted Omaha furnace repair and a/c repair contractor, call Accurate Heating & Cooling for all your Omaha furnace service, Omaha air conditioner service, Omaha commercial roof top unit service, Omaha mini split service, Omaha geothermal unit service, and Omaha home comfort needs. We also professionally install hvac equipment. We are licensed, bonded, insured, and experienced. Call us today at 402-238-2425.