General Assist Technical Reference
Airstage applied product range - understanding model codes
How to read AIRSTAGE applied product nomenclature
Reference covering applied chillers, fan coils, rooftop units, close control units and AHUs.
AIRSTAGE applied product model numbers are built from a series of code groups. Each group identifies the unit type, refrigerant or compressor technology, configuration or version, and unit size. The exact structure varies by product family.
1. General model-code structure
| Code group | What it identifies |
|---|---|
| Unit type | The basic construction or product family. |
| Refrigerant / technology | Refrigerant type and, where applicable, inverter or Turbocor compressor configuration. |
| Version | Efficiency class, heat-pump arrangement, fan type, acoustic package, hydraulic configuration or other options. |
| Size | Capacity and, for some product families, the number of compressors, water-coil rows, heat-exchanger type or refrigeration circuits. |
Example: AAC/IK/A/WP/SSL218P
This example is broken into the unit type, compressor/refrigerant code, family or efficiency code, unit configuration and size.
This example is broken into the unit type, compressor/refrigerant code, family or efficiency code, unit configuration and size.
2. Applied chiller and condenser model codes
Unit type
| Unit description | AIRSTAGE type |
|---|---|
| Aircooled units with axial fans | AAC |
| Aircooled units with radial fans | ARC |
| Watercooled units | AWC |
| Condenserless units | AME |
| Condensing units with axial fans | AMH |
| Condensing units with radial fans | AMR |
| Remote aircooled condensers | ARA |
| Dry-Coolers | ARW |
| Remote hydronic modules | MH |
Refrigerant and compressor technology
| Code | Meaning |
|---|---|
| /K/ | R410A refrigerant |
| /G/ | R452B refrigerant |
| /L/ | R454B refrigerant |
| /Y/ | R134a refrigerant |
| /J/ | R513A refrigerant |
| /H/ | R1234ze refrigerant |
| /I_ | Inverter compressor. The letter I is placed before the refrigerant code. |
| /TT_ | Turbocor centrifugal compressor. |
Specific family / energy-class code
- Empty: Standard unit
- /A: A class efficiency unit
- /ML: MIDY LINE unit - high water temperature heat pump
- /EP: ENERGY POWER unit - multifunctional unit
- /FC: Free-Cooling unit
Version
- Empty: Standard unit
- /WP: Reversible heat pump unit
- /MC: Unit with microchannel condensing coils
- /SSL: Super silenced unit
- /AP: Unit with high ESP fans - radial fan units only
- /ST: Unit with AQUALOGIK technology
- /SP: Unit with storage tank and pump
- /DR: Unit for Dry-Cooler operation
Important: Multiple configurations can be present on the same unit. Where multiple version codes are used, follow the nominated code order.
Size code
- The last digit identifies the number of compressors installed: 1 = one compressor, 2 = two compressors, and so on up to 12.
- The first digits indicate the cooling capacity, expressed as an indicative compressor horsepower value.
- P = plate heat exchanger.
- Empty suffix = shell and tube heat exchanger. Units below 50 kW use a plate heat exchanger.
- -T = dry expansion shell and tube heat exchanger.
- -1 = one refrigerant circuit.
- -2 = two refrigerant circuits.
Worked example - AAC/IK/A/WP/SSL218P
- AAC - aircooled unit with axial fans
- /IK - inverter compressor and R410A refrigerant
- /A - A class efficiency
- /WP - reversible heat pump
- /SSL - super silenced version
- 218 - 18 HP compressor power and two compressors
- P - plate heat exchanger
3. Fan coil model codes
Example: AFW/EC/VP302
| Fan coil type | AIRSTAGE code |
|---|---|
| Fan coil unit with cabinet and AC fans | AFW |
| Fan coil unit with cabinet and EC fans | AFW/EC |
| Fan coil unit for built-in installation with AC fan | AFWI |
| Fan coil unit for built-in installation with EC fans | AFWI/EC |
| Built-in high static pressure fan coil with AC fans | AFWI/HP |
| Built-in high static pressure fan coil with EC fans | AFWI/HP/EC |
| Ductable fan coil with AC fans | ADFW |
| Ductable fan coil with EC fans | ADFW/EC |
| Wall mounted fan coil | AHFW/EC |
| Water cassette with AC fan | ACFW |
| Water cassette with EC fan | ACFW/EC |
| Water cassette with AC fan for 4-pipe system | ACFW/WB |
| Water cassette with EC fan for 4-pipe system | ACFW/WB/EC |
Fan coil version
| Code | Configuration |
|---|---|
| Empty | Standard unit |
| /VP | Bottom inlet and vertical delivery |
| /VH | Front inlet and vertical delivery |
| /VE | Rear inlet and horizontal delivery |
| /VO | Bottom inlet and horizontal delivery |
| /IV | Bottom inlet and vertical delivery |
| /IF | Front inlet and vertical delivery |
| /IO | Rear inlet and horizontal delivery |
| /II | Bottom inlet and horizontal delivery |
Fan coil size: The first digit indicates the number of water-coil rows installed. The remaining digits identify the unit size. For example, 302 indicates 3 rows and size 02.
4. Rooftop model codes
Example: RAT/IK/EC/WP/ECO218
- RAT - rooftop unit.
- RAQ - rooftop unit, single skin.
- /K - R410A refrigerant.
- /I_ - inverter compressor, positioned before the refrigerant code.
- /EC - unit with EC plug fans.
- /WP - reversible heat pump version.
- /ECO - economizer.
- The last digit of the size identifies the number of compressors; the preceding digits indicate the indicative installed compressor horsepower.
Worked example: RAT/IK/EC/WP/ECO218 = rooftop unit, inverter compressor, R410A refrigerant, EC plug fans, reversible heat pump, economizer, 18 HP and two compressors.
5. Close control model codes
Example format: IAXGT/C1017
| Unit description | AIRSTAGE type |
|---|---|
| Aircooled direct expansion unit with full inverter technology | IAXG |
| Aircooled direct expansion Dual Fluid unit with full inverter technology | IATG |
| Aircooled direct expansion unit with EC inverter plug-fans | AXG |
| Aircooled direct expansion unit with radial fans | AXR |
| Aircooled direct expansion Dual Fluid unit with EC inverter plug-fans | ATG |
| Aircooled direct expansion Dual Fluid unit with radial fans | ATR |
| Watercooled direct expansion unit with EC inverter plug-fans | AHG |
| Watercooled direct expansion unit with radial fans | AHR |
| Watercooled direct expansion Free-Cooling unit with EC inverter plug-fans | AFG |
| Watercooled direct expansion Free-Cooling unit with radial fans | AFR |
| Remote aircooled condensers | ACU |
| Chilled water units with EC inverter plug-fans | AWG |
| Chilled water units with radial fans | AWR |
| Chilled water Dual Coil units with EC inverter plug-fans | ADG |
| Chilled water Dual Coil units with radial fans | ADR |
Air-discharge code
- T - top air discharge
- B - bottom air discharge
- U - underfloor air discharge, chilled-water units only
Version
- /C - cooling only
- /E - cooling + heating
- /U - cooling + humidification
- /D - cooling + heating + humidification
Close control size: The final digit identifies the number of compressors. A value of 0 indicates a chilled-water unit, 1 indicates one compressor, 2 indicates two compressors, and so on. The preceding digits indicate the indicative nominal cooling capacity in kW.
6. AHU model codes
The AIRSTAGE naming proposal for air handling units changes the unit-type code while retaining the existing GI product size.
| Description | GI type | AIRSTAGE type |
|---|---|---|
| Air Handling Unit | CTA | ACTA |
Example: GI model CTA 60 becomes AIRSTAGE model ACTA 60. The size remains the same.
7. Quick decoding guide
- Start with the unit-type code to identify the product family.
- Read the next code for the refrigerant and compressor technology, where applicable.
- Identify any family, efficiency or equipment-option codes.
- Read the version codes in order. Some products can contain multiple version codes.
- Finish with the size code, using the rules that apply to that product family.
Reference note: Model-code structures differ between applied chillers, fan coils, rooftop units, close control units and AHUs. Do not apply the size or version rules from one product family to another.