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Electronic Aquastat Controllers provide electronic efficiency. temperature sensing in a UL limit-rated control with a single sensing probe. The L7224A,C and L7248A,C,L SPECIFICATIONS control the circulator, oil or electric burner or contactor, and boiler temperature. The L7224/L7248 is “Outdoor Temperature Reset” ready which is enabled when...
Part Number (mm) Application Mounting 50001464-001 12 (304.8) Well-mounted controls The L7224A,C and L7248A,C,L models are available in a 50001464-003 24 (609.6) Flush-mounted controls well-mount, horizontal position, vertical position, or flush mounted remote from the well versions. Dimensions for 50001464-004 36 (914.4)
® L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT CONTROLLERS New Installation SENSOR WIRES Order well assemblies separately; see Table 1 and form CONTROLLER CASE no. 68-0040, Immersion Wells and Compression Fittings BOILER for Temperature Controllers. Boilers usually have tappings...
Follow the appropriate wiring diagrams shown on the Turn off all power and: inside of the front cover of the L7224A,C; L7248A,C,L or 1. Carefully disconnect sensor from circuit board by in Fig. 8–13.
Temperature units (°F or °C) parameters. * Settings available for adjustment on the 3-digit display The L7224A,C and L7248A,C,L are designed for use with only if a W8735Y1000 or W8735S1000 Outdoor Reset 24 Vac electronic and electromechanical thermostats or Kit is installed.
® L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT CONTROLLERS has not gone below the Low Limit setting (minus the Differential); or, ZR input is not powered with 120 Table 4. Display readout definitions. Vac (only L7248L with ELL set On).
® L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT CONTROLLERS NOTE: This feature is blocked if a Domestic Hot When the Boiler temperature reaches the Frost Protection Water demand occurs. Domestic Hot Water Limit temperature plus a fixed 10 °F differential, the burner...
LINE VOLTAGE OIL BURNER RELAY OUTDOOR RESET MODULE IS OPTIONAL. W8735S1000 WIRED OUTDOOR RESET MODULE SHOWN. FOR BEST PERFORMANCE SET DUU=”ON”. M32023A Fig. 8. L7224A,C; L7248L single heat zone with indirect water tank and circulators. Optional Outdoor Reset Module. 68-0281—16...
® L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT CONTROLLERS Table 6. L7224/L7248 Controller Operating Sequence. Action System Response Thermostat calls for heat. Circulator starts when water temperature is above Low Limit setting (if applicable) or above the Thermal Purge Temperature Limit (tPL) if Thermal Purge is enabled.
® L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT CONTROLLERS Table 8. Controller Operating Sequence with External Low Limit device connected trough the ZR terminal. Action System Response Zone Request (ZR) terminal is connected to Boiler temperature is checked. Burner starts when water temperature L1 (External Low Limit call for heat).
® L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT CONTROLLERS Table 11. Troubleshooting Guide System Diagnostic Condition Condition Check Action Boiler is hot, Display is ON. 120 Vac at C1-C2 • 120 Vac at C1-C2, check wiring to pump. house is cold.
DUU MUST BE SET TO “ON” ON THE AQUASTAT. REFER TO DEVICE LABEL FOR WIRE COLOR CODE. VALVE IS OPTIONAL ON SPECIFIED MODELS. M32025B Fig. 10. L7224A,C single zone system with circulator and indirect water tank with EnviraCOM™ thermostat. 68-0281—16...
® L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT CONTROLLERS ELL=OFF TO ADDITIONAL R845A ZONE 2 RELAYS FOR OTHER ZONES CIRCULATOR (HOT) L2 R845A RELAY ZONE 2 ZONE 2 LOW VOLTAGE ENVIRACOM THERMOSTAT LOW VOLTAGE TERMINALS THERMOSTAT W8735Y1000 OR W8735S1000...
® L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT CONTROLLERS W8735Y1000 OR W8735S1008 W8735S1000 MULTI-ZONE 1 2 3 TS TS 1 2 3 OT OT RELAY PANEL C7089U OUTDOOR SENSOR 32003971-003 TEMPERATURE SENSOR R7184/R7284 (HOT) L2 LIMIT L7224 BURNER ENVIRACOM™...
® L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT CONTROLLERS ELL=ON L1 (HOT) L6006 LOW LIMIT CONTROLLER VOLTAGE THERMOSTAT L7248L SENSOR LINE VOLTAGE CIRCULATOR LINE VOLTAGE OIL BURNER RELAY POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.
® L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT CONTROLLERS Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North ® U.S. Registered Trademark Golden Valley, MN 55422 © 2013 Honeywell International Inc. 68-0281—16 M.S. Rev. 09-13 customer.honeywell.com Printed in United States...
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