Tag: T4 Programmable Thermostat

Honeywell T4H110A1021 T4 Programmable Thermostat Installation Guide Quick Start Installation Guide Compatible with 24-230V on/off appliances such as gas boilers, combi-boilers and zone valves. Not compatible with 230V electric heating. Installation in 3 steps… Must be installed by a competent person. To ensure your safety make sure the mains power is switched OFF before accessing…