Not required., EC inverter fans., IM - Automatic circuit breakers., PFC1 - Power factor correction condensers., SL - Unit silencement., RFM - Cooling circuit shut-off valve on discharge line., RFL - Cooling circuit shut-off valve on liquid line., BT - Low water temperature kit., EC - EC Inverter fans., ECH - EC Inverter fans with high ESP., TX - Coil with pre-coated fins., PSC - Single circulating pump cooling side., PSIC - Inverter single circulating pump cooling side., PDC - Double circulating pump cooling side., PDIC - Inverter double circulating pump cooling side., PSH - Single circulating pump heating side., PSIH - Inverter single circulating pump heating side., PDH - Double circulating pump heating side., PDIH - Inverter double circulating pump heating side., PSC+PSH - Single circulating pump cooling side + heating side., PSIC+PSIH - Inverter single circulating pump cooling side + heating side., PDC+PDH - Double circulating pump cooling side + heating side., PDIC+PDIH - Inverter double circulating pump cooling side + heating side., GS - Single circulating pump gasket for glycol >30%., GD - Double circulating pump gaskets for glycol >30%., GH - Single circulating pump cooling side + heating side gaskets for glycol >30%., GY - Double circulating pump cooling side + heating side gaskets for glycol >30%., FNC - Antifreeze heater for pipes cooling side., FGC - Antifreeze heater for single pump and pipes cooling side., FMC - Antifreeze heater for double pump and pipes cooling side., FNH - Antifreeze heater for pipes heating side., FGH - Antifreeze heater for single pump and pipes heating side., FMH - Antifreeze heater for double pump and pipes heating side., SS - Soft start., TS - Touch Screen interface., WM - Web Monitoring., IS - Modbus RTU protocol, RS485 serial interface., IST - Modbus TCP/IP protocol, ethernet port., ISB - BACnet MSTP protocol, RS485 serial interface., ISBT - BACnet TCP/IP protocol, Ethernet port., ISS - SNMP protocol, Ethernet port., IAA - Remote set-point, 4–20 mA signal., IAS - Remote signal for second set-point activation., IAV - Remote set-point, 0–10 V signal., IDL - Demand limit from digital input., CP - Potential free contacts., GDS - Leak detector., MN - High- and low-pressure gauges.