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manual abstract
L1 (HOT) L2 SYSTEM TRANSFORMER R C W1 W2 B HEATING CHANGEOVER RELAY O Y2 Y1 G RC COMPRESSOR CONTACTOR COOLING CHANGEOVER RELAY FAN RELAY HEAT 2 HEAT 1 HIGH LIMIT HIGH LIMIT HEAT OFF COOL SYSTEM SWITCH COOL 1 COOL 2 AUTO ON FAN SWITCH NON-ELECTRIC ELECTRIC POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FAN OPERATION SWITCH MAY BE IN EITHER POSITION. 1 2 NOMINAL 24 VAC POWER MUST BE PRESENT BETWEEN R AND C FOR THERMOSTAT OPERATION. DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION. FAN OPERATION SWITCH2 3 1 SUBBASE LOGIC/ CONTROL CIRCUIT 4 3 4 POWER SUPPLY THERMOSTAT LOGIC CIRCUIT NOTE: THERMOSTAT DOES NOT PROVIDE MINIMUM OFF TIME IN HEATING. M1546A Refer to Figs. 8-14 for typical hookups of subbase and thermostat. ADJUSTING CYCLE RATE To customize the thermostat cycling performance to various types of heating equipment, cycle rate adjustment screws are provided on the back of the thermostat to provide optimum room temperature control. NOTE: Most applications will not require a change in cycle rate. The room air temperature will normally vary slightly from the comfort temperature setting with the cycling of the fur-nace or air conditioner. The cooling cycle rate is factory-set and cannot be adjusted. The heating cycle rate can be adjusted by turning one or both cycle rate adjustment screws located on the back of the thermostat. In multistage heat systems, the cycle rate adjustment applies to the highest stage of heat only. Screws should be backed out about one-half to one turn, or be turned in until tight. See Fig. 15. 15 68-0058—1 Fig. 17—Mounting thermostat on subbase. Fig. 17—Mounting thermostat on subbase. D INSTALLATION • CHECKOUT B. A. HEAT AUTO COOL OFF ON AUTO FAN PM MORNIMG MON HEAT ON ROOM SYSTEM AUTO M 843 PM MORNIMGMON HEAT ONROOM SYSTEM RUNPROGRAM TIME TEMPERATURE PRESENTSETTING SKIPNEXTPERIOD CHANGETO LASTPERIOD SETPRESENTDAY/TIME HOLDTEMP DAY SETHEAT/COOL CANCELPERIOD COPYFROM AHEAD WARMER COPYTO BACK COOLER PERIOD C. Checkout HEATING Move the system switch to HEAT and the fan switch to AUTO. Press WARMER key until the setting is about 10° F [6° C] above room temperature. Heating should start (both stages if multistage), and the fan should run (may be a short delay on forced air systems). Press cooler key until the setting is about 10° F [6° C] below room temperature. The heating equipment should shut off, followed by the fan. NOTE: On an AUTO changeover thermostat, the cooling temperature must be set at least 3° F [2° C] above the heating temperature, or display will flash. COOLING ! CAUTION Do not operate cooling if outdoor temperature is below 50° F [10° C]. Refer to manufacturer’s recommendations. NOTE: When cooling setting is changed, thermostat will wait up to five minutes before turning on the cooling equipment. This delay is to protect the compressor. Move the system switch to COOL and the fan switch to AUTO. Press COOLER key until the setting is about 10° F [6° C] Below room temperature. The cooling equipment and fan should start (both stages if multistage). Press WARMER key until the setting is about 10° F [6° C] above room temperature. The cooling equipment and fan should stop. NOTE: On an AUTO changeover thermostat, the heating temperature must be set at least 3° F [2° C] below the cooling temperature, or display will flash. FAN Move the system switch to OFF, and the fan switch to ON. The fan should run continuously. When the fan switch is in the AUTO position, fan operates directly with the thermostat call for cooling and also with the thermostat call for heating. 17 68-0058—1 T8621A,C,D T8621A,C,D INSTALLER SELF-TEST (OPTIONAL) IMPORTANT: 1. Thermostat must have ac power to perform self- test. Relays will not toggle, codes will not be present and thermostat will not manually exit self-test without ac power. 2. Five-minute time delay on cooling does not function during self-test. Perform the following test as a check of all thermostat functions. If thermostat does not respond as indicated, thermostat must be replaced. 1. Press AHEAD and BACK keys at the same time. While holding keys down, all segments of the display should be on (see Fig. 18). Fig. 18—All segments on display. AM SUN MORNING REPL BAT SET PT ROOM PM OUTDOORTUE WED THU FRI SAT TEMPORARYMON MIDDAY EVENING NIGHT COOL ON HEAT ON M 525A 2. Set the system switch to OFF. Press and release AHEAD and BACK and PRESENT SETTING keys at the same time to enter self-test. 3. Press each key as listed below, and look for responses listed as key is held down and released. System Switch Position Press This KeyLook For This Response Key Down Key Released OFF CHANGE TO LAST PERIOD 03 Blank SKIP NEXT PERIOD 07 Blank PRESENT SETTING 15 Blank COOL or AUTO (with fan PRESENT SETTING 15 1st stage cooling, fan and SYSTEM LED on. in AUTO) PRESENT SETTING 15 2nd stage cooling also on. PRESENT SETTING 15 2nd stage cooling off. PRESENT SETTING 15 1st stage cooling, fan and SYSTEM LED off. NOTE: If single-stage cooling syste...