| AD | Hydraulic connections / manifolds on the right side. |
| BC | Auxiliary hot water coil for 4-pipes installation. |
| BR | Additional drain pan. |
| CPI | Built-in, steel plate feet. |
| CPV | On sight, painted steel plate feet. |
| CPZ | Painted steel plate feet for back panel LP. |
| FR | Spare air filter. |
| GB | ABS fixed air inlet grid with filter for STL — STW — STK versions. |
| GD | ABS fixed air inlet grid without filter for STL — STW — STK versions. |
| GO | Adjustable air discharge grids. |
| JA | Straight plenum on air discharge. |
| JB | Insulated 90° plenum on air discharge. |
| JC | 90° plenum on air inlet. |
| JD | Telescopic extension for straight and 90° plenums. |
| K22 | ON/OFF 2-way valves for 2-pipe systems. |
| K32 | ON/OFF 3-way valves for 2-pipe systems. |
| K24 | ON/OFF 2-way valves for 4-pipe systems. |
| K34 | ON/OFF 3-way valves for 4-pipe systems. |
| LA | White pre-painted steel panel + 90° plenum on air inlet for STW versions. |
| LB | White pre-painted steel panel + 90° plenum on air inlet and discharge for STL and STK versions. |
| LC | White painted wood panel with 90° plenum on air inlet for STW version |
| LD | White painted wood panel with 90° plenum on air inlet and discharge for STL and SCK versions. |
| LE | Painted lower closing panel without grid. |
| LF | Painted lower closing panel with grid and filter. |
| LP | Painted back closing panel (for fan coil installation on sight, far from the wall). |
| PB | Condensing water pump. |
| RE | Electric heaters. |
| SI | Interface card for the control of max 4 units with only one thermostat (one card and one thermostat every 4 units). |
| TA | Electronic thermostat to be installed on unit border with: manual ON/OFF switch, summer/winter manual switch, 3 speed manual selection switch (already included on VTL — VTZ — VTY versions). |
| TB | TA Electronic thermostat with additional bulb room thermostat. |
| T1 | TA Electronic thermostat with additional electronic thermostat with NTC probe for control of room temperature (for VTL – VTZ – VTY versions it can standard TA). |
| T2 | Additional water low temperature with probe TA — TB and T1, in order to permit the starting of the fan only when the hot water is on the right temperature. |
| T3 | Remote control with: manual ON/OFF switch, summer/winter manual switch, 3 speed manual selection switch (in replacement of TA). |
| T4 | Programmable remote electronic control (in replacement of on-board control) for control of temperature, fan, valves, electric heater, heat/cool cicle, filter. |
| T5 | Programmable electronic control with infrared distant control, not usable with RE (in replacement of on-board control) for control of: temperature, fan, valves, condensing water pump, heat/cool cicle, fresh air louver, air/water probes, clock, ON/OFF timer). |
| V2 | Shut-off valves for 2-pipe systems. |
| V4 | Shut-off valves for 4-pipe systems. |
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