Not required., BRC1E52A/B Premium wired remote control with full text interface and back light., BRC1D52 Standard wired remote control with weekly timer., BRC4C65 Infrared remote control including receiver., BRC2E52A Simplified wired remote control for heat recovery., BRC3E52A Simplified wired remote control for heat pump., DCS302C51 Central remote control., DCS301B51 Unified ON/OFF control., DST301B51 Schedule timer., DCM601A51 Intelligent Touch Manager., KRCS01-4B External wired temperature sensor., K.RSS External wireless temperature sensor., KRP4A51 Wiring adapter for external monitoring/control via dry contacts and setpoint control via 0-140 Ω., KRP2A51 Wiring adapter for external central monitoring/ control (controls 1 entire system)., KRP1B61 Wiring adapter with 4 output signals., EKMTAC Adapter for multi-tenant (24 V a.c. PCB power interface).