Honeywell CT1800 Owner's Manual - Page 6

6 MOUNT THE THERMOSTAT Note the tabs on the top inside edge of the thermostat base. These fit the slots molded into the top of the wallplate or subbase. Hang the thermostat base on the wallplate or subbase as shown in illustration. Insert the two captive mounting screws located in the bottom corners of the thermostat base (see illustration); firmly tighten. IMPORTANT: Do not cycle heating system until step 7 is completed. 9 8 76 10 5 12 11 6 11 10 9 8 7 TAB (2) MOUNTING SLOT (2) 3 2 1 12 4 35 30 25 20 10 M3408 THERMOSTAT BASE WALLPLATE OR SUBBASE JUMPER WIRES CAPTIVE MOUNTING SCREWS 7 SET HEAT ANTICIPATOR LEVER The thermostat adjustable heat anticipator must be correctly set to accurately control the on-time length of the system. An incorrect setting can result in room temperature swings or burn out the anticipator and void the thermostat warranty. Make sure you have the current draw (anticipator setting) for your system. This is the number you wrote in the box in Step 3. If you were unable to find the current draw for Step 3, this information can be found printed on the primary control at the furnace or boiler. The primary control is usually a gas valve, a relay or burner control box, Aquastat controller or zone valve with the thermostat wires connected to it. These controls are usually located behind the furnace cover. See next illustration. If current rating is still unavailable, proceed as follows: • Connect the probes of an ac ammeter (0 to 2.0A for example) between the R (or RH) and W terminals on the wallplate or subbase. • Let the system operate through the ammeter for at least one minute before taking reading. Record the reading here . 8406 SHOWS VOLTAGE RATING SHOWS ANTICIPATOR SETTING V8043E 1004 4 24V 50/60CY .32 AMP @ 60CY ZONE VALVE SHOWS VOLTAGE RATING FROM MAIN FUEL SUPPLY 24 Vac 50/60 Hz 0.4 AMP TYPICAL GAS VALVE OIL BURNER CONTROL SHOWS CURRENT DRAW SHOWS VOLTAGE 0.2 3A0MVPACRATING TO BURNER SHOWS ANTICIPATOR SETTING T T F F M6116B Move the heat anticipator to match the number you recorded in Step 3 or found on the primary control as shown above, or as recorded in Step 7. IMPORTANT: Most hot water systems require a setting of 1.3 times the valve current rating. 69-0394-3 ANTICIPATOR SCALEPLATE ANTICIPATOR SETTING LEVER 6 M9616