Input Module (Modular Program) Model: KT-MK8501 The control signal input module is divided into both the air-conditioning control module, opto isolated input module. Air-conditioning fan coil control module controls a group of may be from the relevant modules, but also from the human-machine interface (air conditioning controller). Opto isolated input module to receive 8-channel switch input, and provide to the relevant module queries. Module can be extended Enter the number of circuits: 8-way Working voltage: DC12V Input signal: switching capacity Working temperature :0-50 Operating humidity :5-90% RH Installation: 35mm standard rail