[PDF] evohome Installation Guide - Honeywell evohome Installation Guide. evohome. Installation Guide. The connected heating controller. evohomeController Digital Room Thermostat (DTS92) Wireless Relay Box (BDR91) Wireless Relay Box (BDR91) Wireless Cylinder Thermostat Transceiver (CS92) Wireless Cylinder Thermostat Strap-on Sensor (CS92) Wireless Cylinder Thermostat Insertion Sensor (CS92) Radiator Controller (HR92) Wiring Diagrams - Honeywell Home Heating Controls Our Wiring Diagrams section details a selection of key wiring diagrams focused around typical Sundial S and Y Plans. Wiring Diagrams Contains all the essential Wiring Diagrams EVOHOME Help! - The EVOHOME Shop Honeywell wiring diagrams for the correct wiring of BDR91’s for Combi Boilers, Motorised Zone Valves and S Plan and Y Plan systems is on Page 44 to Page 47 of the evohome Installation Manual and the ‘BDR91 reset procedure’ is on Page 19, Step 1 (it says press and hold the button for 15 seconds, but in practice just press and hold until you get a fast flash which occurs at a count of about 15 seconds – What is the difference between an S plan and a Y plan? Aug 10, 2018Describes the answer or the required steps that resolve the issue. The basic difference between the Y Plan and the S Plan is the type of valves used in the pipework. The Y Plan has one three port mid-position valve supplying heating and hot water for domestic use, as shown below: The S Plan has two separate 2 port motorized valves, one for central heating and one for domestic hot water.