As an established heating & cooling contractor serving the Elkhorn, Omaha, La Vista, Papillion, Blair, Council Bluffs area, we work on RTUs which provide heating and cooling for commercial applications in the Omaha metro area. For commercial maintenance personnel or others who would like to identify the various technical components within a particular Trane 13 or 16 SEER RTU, this blog will help in decoding the model number to identify the technical contents of the Trane roof top unit. 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.
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)
033 3 Ton (13 SEER)
036 3 Ton
043 4 Ton (13 SEER)
048 4 Ton
060 5 Ton
063 5 Ton (13 SEER)
072 6 Ton
074 6 Ton, Dual Compressor
090 7.5 Ton, Single Compressor
092 7.5 Ton, Dual Compressor
102 8.5 Ton
120 10 Ton
Digit 7 – Major Design Sequence
E R-410 Refrigerant
F Microchannel Type Condenser Coils 
G Microchannel Type Evaporator and Condenser Coils
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
A 5kW (1 phase) 
B 6kW (3 phase)
C 9kW (3 phase)
D 10kW (1 phase) 
E 12kW (3 phase)
F 14kW (1 phase) 
G 18kW (1&3 phase)
J 23kW (3 phase)
K 27kW (3 phase)
N 36kW (3 phase)
P 54kW (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 
B Second 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 [3,7]
F Economizer, Reference Enthalpy 0-100% with Barometric Relief [3,7]
G Economizer, Comparative Enthalpy 0-100% without Barometric Relief [3,7]
H Economizer, Comparative Enthalpy 0-100% with Barometric Relief [3,7]
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 
1 Oversized Motor
2 Optional Belt Drive Motor 
6 Single Zone VAV [27, 34]
7 Multiple-Speed Indoor Fan 
E Hinged Access Panels/2” Merv 13 Filters
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 Guard26
4 CompleteCoat Condenser Coil
5 CompleteCoat Condenser Coil with Hail Guard
Digit 18 – Through-the-Base Provisions
Note: The below are applicable to Digit 1, T or Y models
0 No Through-the-Base Provisions
A Through-the-Base Electric 
Note: The below are applicable to Digit 1, Y models only
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 Breaker8
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
1 Trane 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 System 
B Dehumidification Option [22,23]
Digit 23 – Refrigeration Controls
Note: The below are applicable to Digit 7 = E, F, G
0 No Refrigeration Control5
1 Frostat [11, 30]
2 Crankcase Heater 
3 Frostat11, 30 and Crankcase Heater 
Digit 24 – Smoke Detector 
0 No Smoke Detector
A Return Air Smoke Detector [12, 13]
B Supply Air Smoke Detector
C Supply and Return Air Smoke Detectors [12, 13]
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) [15, 31]
9 Novar Zone Temp Sensor (NOVAR 3051) [19, 31]
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 Switch14 Discharge Air Sensing  and Condensate Drain Pan Overflow Switch
Digit 26 – System Monitoring Controls
0 No Monitoring Controls
A Demand Control Ventilation (CO2) [32, 33]
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 Available on 3 to 5 ton models.
2 Crankcase heaters are optional on (T,Y)SC (036, 048, 060, 072, 090, 102, 120); standard on (T,Y)HC (036, 048, 060, 072, 074, 092, 102, 120).
3 Not available with electromechanical controls.
4 Manual outside air damper will ship factory supplied within the unit, but must be field installed.
5 High pressure control is standard on all units.
6 Multi-speed, direct drive motor with no belt drive option is standard on 3 to 5 ton, standard efficiency, 13/14 SEER units. Multi-speed, direct drive motor with a belt drive option is available for 3 to 5 ton, 15 SEER units. On 6 to 10 tons, multispeed direct drive is standard on all 10 ton and 6 (074) to 8.5 ton high efficiency. Belt drive is standard on all other units.
Digit 15 = 0
3 Phase (3 to 5 Ton) = Multispeed Direct Drive Motor
3 Phase (6 to 8.5 Ton) = Belt Drive
3 Phase (10 Ton) = Ultra High Efficiency Direct Drive Plenum Fan
1 Phase = High Efficiency Multispeed Direct Drive Motor
3 Phase (3 to 5 Ton) = High Efficiency Multispeed Direct Drive Motor
3 Phase (3 to 5 Ton w/Dehumidification) = Belt Drive Motor
3 Phase [6 (074) to 10 Ton] = Ultra High Efficiency Direct Drive Plenum Fan
7 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.
8 Through-the-base electric required when ordering disconnect/circuit breaker options.
9 Requires use of disconnect or circuit breaker.
3 to 5 Tons and 10 Ton w/575V
3 to 5 Tons w/Standard Indoor Motor w/460V
High Efficiency 575V
10 Standard metering devices are TXVs.
11 Frostat cannot be field installed in electro-mechanical units.
12 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.
13 Return air smoke detector cannot be ordered with Novar controls.
14 These options are standard when ordering Novar controls.
15 This option is used when ordering Novar controls.
16 Includes gas piping and shutoff (field assembly required).
17 Not available with high temperature duct sensor accessory.
18 Digit 15 = 2
3 Phase = Not Available
1 Phase = Not Available
3 Phase (3 to 5 tons) = May be ordered
3 Phase (3 to 5 tons w/dehumidification) = Not Available
3 Phase (6 to 10 tons) = Not Available
19 Novar sensor utilized with Digit 21 = (4) Novar 3051 controls without zone sensor.
20 Available for gas/electric, 3 to 5 tons high efficiency, single phase models.
21 Available for all models except gas/electric, 3 to 5 tons high efficiency, single phase.
22 Requires selection of 2” pleated filters (option B or C) for Digit 16.
23 Not available on all single phase or standard efficiency.
24 Standard on T/YSC 6, 7.5 (single and dual systems), 8.5, 10 ton standard efficiency models and T/YHC 4, 5, 6, 7.5, 10 ton MCHE high efficiency models (except for 4, 5, 6 ton dehumidification models).
25 Not available on high efficiency 575V.
26 Epoxy coil and epoxy with hail guard options are not available for units with microchannel condenser coil.
27 Single zone VAV is only available on 6 to 10 tons high efficiency and 10 ton standard efficiency products with ReliaTel controls.
28 Multi-speed indoor fan available only on 6, 7.5, & 8.5 tons high efficiency, and 10 ton products with ReliaTel controls.
29 Motorized outside air damper is not available on multi-speed or SZVAV (single zone Variable air volume) products.
30 Frostat standard on Y/TSC033 to 063G electromechanical, multispeed and SZVAV (single zone Variable air volume) products.
31 Novar is not available with SZVAV products.
32 Demand control ventilation not available with electromechanical controls.
33 Demand control ventilation option includes wiring only. The CO2 sensor is a field-installed only option.
34 Discharge air sensing is also standard equipment on units with single zone and supply air temperature control VAV.
35 Must be used with BACnet open protocol.
Additional information and product literature is available from the Trane website. The website may offer additional information above and beyond the Trane 13 or 16 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. The content of these other blogs will contain similar information to the Trane 13 or 16 SEER RTU model number decoding that is provided in this current blog.
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 roof top unit installation and repair contractor, call Accurate Heating & Cooling for all your Omaha RTU service, Omaha air conditioner service, Omaha furnace 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. We also have the highest BBB rating available. Call us today at 402-238-2425.