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11. L8124L multizone system with circulator connections and internal schematic. OPERATION High Limit Controller The high limit opens and turns off the burner when the water temperature reaches the setpoint. The high limit automatically resets after the water temperature drops past the setpoint and through the 10°F (6°C) differential. WARNING Explosion Hazard. Can cause serious injury, death or equipment damage. Use this product only in systems with a pressure relief valve. Low Limit and Circulator Controllers On a temperature rise, with the adjustable differential at the minimum setting of 10°F (6°C), the burner circuit (R-B) breaks and the circulator circuit (R-W) makes at the control setpoint. On a temperature drop of 10°F (6°C) below the setpoint, the R-B circuit makes and the R-W circuit breaks. See Fig. 12. At any differential setting greater than 10°F (6°C), the R-B make temperature and the R-W break temperature remain the same (control setting minus 10°F [6°C]). The R-B break and R-W make temperature are the setpoint temperature plus the difference between the differential setting and 10°F (6°C). EXAMPLE: Setpoint of 140°F (60°C), differential set at 25°F (14°C). On a temperature rise, R-B breaks and R-W makes at 155°F (68°C). On a temperature fall, R-B makes and R-W breaks at 130°F (54°C). HIGH LIMIT SETTING LOW LIMIT AND SETTING CIRCULATOR SWITCH BREAKS ON TEMPERATURE RISE. BURNER TURNS OFF. CIRCULATOR OPERATES ON A CALL FOR HEAT. SWITCH MAKES ON TEMPERATURE FALL. BURNER OPERATES ON A CALL FOR HEAT. SWITCH MAKES R-W AND BREAKS R-B ON TEMPERATURE RISE. 1 SWITCH MAKES R-W AND BREAKS R-B ON TEMPERATURE RISE. SWITCH MAKES R-B AND BREAKS R-W ON TEMPERATURE FALL. BURNER IS ON TO MAINTAIN MINIMUM WATER TEMPERATURE. CIRCULATOR IS OFF. 1 WHEN WATER REACHES PROPER TEMPERATURE, THE BURNER SHUTS OFF OR THE CIRCULATOR PUMP STARTS (WHEN CALLING FOR HEAT). M1523 Fig. 12. Relationship of setpoints and differential. 7 95-6571.11 L8124A,C,E,L AND M AQUASTAT® RELAYS L8124A,C,E,L AND M AQUASTAT® RELAYS LOW VOLTAGE M8804 L1 (HOT) L2 1 3 1 2 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED. B1 IS 1/4 IN. TAB TERMINAL. LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE LINE VOLTAGE CIRCULATOR C2 C1 B2 B1R B HIGH LIMIT ZC 1K1 BRW LOW LIMIT 1K L2 L1 G TT L8124M THERMOSTAT 3 Fig. 13. L8124M single zone connectionsand internal schematic. SETTING Follow the boiler manufacturer recommendations when making the L8124 settings. The high limit setting must be at least 20°F (11°C) higher than the low limit setting. Set the indicators over the selected temperature marks. The low limit differential is set by turning the differential adjustment knob to the desired amount of differential. The thermostat heat anticipator should be set at 2.0A. CHECKOUT Put the system into operation and observe each function through at least one complete cycle. Be sure the control operates as intended. Automation and Control SolutionsAutomation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitee 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 95-6571.11 G.R. Rev. 12-01 ...

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