User manual HONEYWELL ST799

[. . . ] ELECTRONIC DUAL ZONE TIMER PRODUCT DATA The ST799 electronic dual zone timer is used to control gravity, primary or fully pumped central heating systems requiring a single 7-day programme with two ON/OFF periods per day. ST799 incorporates a simple and intuitive programming concept which established the 24-hour version (ST699) as the leading electronic dual zone timer on the market. [. . . ] 1 EN0R 8440 R0 2 ST799 ELECTRONIC DUAL ZONE TIMER WIRING Cable entries can be made through the opening in the rear of the subbase, or via the three surface entry break-outs in the top and two sides of the wallplate. 2 The ST799 is designed for fixed wiring only and must be wired in accordance with the latest IEE wiring regulations. Ensure the wiring connections to the mains supply is via a fuse rated at not more than 3 A and a Class "A" switch (having contact separation of at least 3 mm in all poles). Remove the terminal cover to allow access to the wiring terminals as shown in fig. 2. Connect the systems wiring as shown by the specific applications wiring diagram. A maximum of two 2. 5 mm2 (cross sectional area) wires can be connected to each terminal as shown in fig. 3. Each wire should be stripped of insulation to a length no greater than 7mm to safeguard against the possibility of electrical shorts. 3 Basic System 1 - without thermostats BOILER Fig. 2 Systems Wiring Basic Wiring DHW ON DHW OFF CH ON CH OFF PUMP CLOCK CLOCK *A link must be provided between L-5-8 on the subbase of ST799 for all Sundial Plans, or fully controlled pumped primary systems Basic System 2 - with room thermostat BOILER Basic System 3 - as System 2 except boiler cycling controlled by room thermostat when DHW is switched OFF BOILER FUSE PUMP PUMP ROOM THERMOSTAT ROOM THERMOSTAT CLOCK CLOCK 3 EN0R 8440 R0 ST799 ELECTRONIC DUAL ZONE TIMER SUNDIAL PLAN WIRING DIAGRAMS Y-Plan ROOM STAT. MID-POSITION VALVE S-Plan HEATING V4043H 2 PORT ZONE VALVE V4043H 2 PORT ZONE VALVE HOT WATER ROOM STAT. CYLINDER STAT. 3 A max PUMP PUMP CLOCK BOILER CLOCK BOILER C-Plan T6360/T4360 ROOM STAT. L641 CYLINDER STAT. V4043H 2 PORT ZONE VALVE W-Plan T6360/T4360 ROOM STAT. L641 CYLINDER STAT. V4044 DIVERTING VALVE 3 A max PUMP 3 A max PUMP CLOCK BOILER CLOCK BOILER Final Assembly NOTE: In the Sundial S, W, and Y Plan wiring diagrams, connections are shown to basic boilers only. [. . . ] If the display remains blank, press the RESET button with a blunt object. a pencil) Honeywell Control Systems Limited Newhouse Industrial Estate Motherwell ML1 5SB United Kingdom Helping You Control Your World EN0R 8440 R0 [. . . ]