Honeywell L7224U Installation Instructions Manual
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Honeywell L7224U Installation Instructions Manual

Oil electronic aquastat
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L7224U
Oil Electronic Aquastat
APPLICATION
The EnviraCOM ™ enabled L7224U Oil Electronic
®
Aquastat
Controller provides electronic temperature
sensing in a UL limit-rated controller with a single
sensing probe. The L7224U controls the circulator, oil
burner and boiler temperature.
The L7224U is "Outdoor Temperature Reset" ready,
which is enabled when connected to the 50022037-002
Outdoor Reset Module. (option 1)
Additionally, the L7224U provides adjustable short cycle.
The L7224U replaces the L8124A, L8124C, L7124U,
L7148A, L7248A,C, L7224A,C, and L8148A Controllers.
The Aquastat Controller is intended for use in residential-
type applications.
The L7224U provides status and diagnostic information
through an LED display combined with LED lights as well
as EnviraCOM enabled thermostats and diagnostic tools
to enhance the diagnostic process.

SPECIFICATIONS

Electrical Ratings:
Voltage: 120 Vac, 60 Hz.
Power: 7 VA maximum at 120 Vac plus external loads.
Thermostat current: 100 mA nominal at 24 Vac.
Burner Relay:
7.4 A at 120 Vac Full Load Amperage (FLA);
44.4 A inrush Locked Rotor Amperage (LRA);
Less Ignition Load: 360 VA.
Circulator Relay:
7.4 A at 120 Vac FLA; 44.4 A inrush LRA.
Zone Controller (ZC): 7.4 A at 120 Vac FLA;
44.4 A inrush LRA.
NOTE: All loads combined cannot exceed 2000 VA.
Environmental Ratings:
Temperature: -30° F to +150° F (-34° C to +66° C).
Humidity: 0 to 95% relative humidity, noncondensing.
Approvals:
Underwriters Laboratories Inc. Component Recognized.
Canadian Underwriters Laboratories Inc. Component
Recognized.
®
Controller
Installation INSTRUCTIONS
Accessories (Ordered Separately):
50022037-002 AquaReset™ Outdoor Reset Module
C7089U1006 Outdoor Temperature Sensor (used with
the 50022037-002)
W8735S1000 (AquaReset™ Outdoor Reset Kit) includes
50022037-002 and C7089U1006)
50022037-005 Domestic Hot Water Module
32003971-003 Temperature Sensor (used with
50022037-005)
W8735S1008 AquaReset™ Domestic Hot Water Kit
(includes 50022037-005 and 32003971-003)
Sensor (See Table 2).
Sensor Well Clamp 121371AA.
14,000,485-016 1/4 in. (6.35 mm) diameter, 1-1/4 in.
(31.75 mm) length glass cartridge Fuse, 1 A,
Slow-Blow.
120650 Heat Conductive Compound.
Table 1. Wells for L7224U Controller.
Part
Spud Size
Number
in. (mm)
123869A 1/2 (12.7) NPT
123870A 3/4 (19.05) NPT 3 (76.2)
Table 2. Sensors for L7224U Controller.
Length in.
Part Number
(mm)
50001464-001
12 (304.8) Well-mounted controls
50001464-002
18 (457.2) Flush-mounted controls
50001464-003
24 (609.6)
50001464-004
36 (914.4)
50001464-005
48 (1219.2)
Insertion
Insulation
in. (mm)
in. (mm)
3 (76.2)
1-1/2 (38.1)
1-1/2 (38.1)
Application
69-1720-03
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Summary of Contents for Honeywell L7224U

  • Page 1 W8735S1000 (AquaReset™ Outdoor Reset Kit) includes sensing in a UL limit-rated controller with a single 50022037-002 and C7089U1006) sensing probe. The L7224U controls the circulator, oil 50022037-005 Domestic Hot Water Module burner and boiler temperature. 32003971-003 Temperature Sensor (used with 50022037-005) The L7224U is “Outdoor Temperature Reset”...
  • Page 2 Mounting 3. The installer must be a trained, experienced service The L7224U can be mounted in a well mount, horizontal technician. or vertical position, or flush mounted remote from the well. 4. After installation is complete, check out product operation as provided in these instructions.
  • Page 3 M22119A plastic bag of compound lengthwise and twist it gently. Then snip off end of bag and work the Fig. 4. Location of L7224U flush-mounting tabs and open end of the bag all the way into the well. LEDs. Slowly pull out the bag while squeezing it firmly to distribute compound evenly in the well.
  • Page 4 Follow the appropriate wiring diagrams shown on the unsuitable for the new installation, remove it and proceed inside of the front cover of the L7224U or in Fig. 9, 10, and with instructions for new installation. If the old well is suitable, use it.
  • Page 5 After 60 seconds without any button inputs, the controller will automatically return to the The L7224U is designed for use with 24 Vac electronic RUN mode. and electromechanical thermostats and EnviraCOM™ enabled thermostats, and have screw-type terminals for To use the L7224U in a cold start boiler application, easy field connection.
  • Page 6 ® L7224U OIL ELECTRONIC AQUASTAT CONTROLLER Operation Display The L7224U can be in any of four operational states: Text Description Shows Normal, High Limit, Low Limit and Error. The controller moves back and forth from High Limit to Normal to Low Error Code (if one is present) Limit state as part of normal operation.
  • Page 7 LINE VOLTAGE CIRCULATOR The ZR terminal on the L7224U can be selected to service an indirect water heater heat request. This parameter is set via the 3 digit display (see Adjusting Settings section of this document). A heat request via the...
  • Page 8 ® L7224U OIL ELECTRONIC AQUASTAT CONTROLLER Table 3. L7224/L7248 Controller Operating Sequence. Table 4. L7224 Controller Operating Sequence with Action System Response multiple zones connected through the ZR terminal Thermostat Circulator starts when water temperature is calls for heat. above Low Limit setting (if applicable).
  • Page 9 ® L7224U OIL ELECTRONIC AQUASTAT CONTROLLER Table 7. LED Error Codes. Aquastat Error EnviraCOM Code Cause/Action Alarm Err1 Aquastat sensor fault; check water sensor. Err2 ECOM fault; check EnviraCOM™ wiring. Err3 Excessive electrical noise or frequency out of range. Hardware fault; replace controller.
  • Page 10 ® L7224U OIL ELECTRONIC AQUASTAT CONTROLLER Table 8. Troubleshooting Guide System Condition Diagnostic Condition Check Action Boiler is cold, house Display is OFF. 120 Vac system power. Turn system power on. is cold. Display is ON. 24 Vac T-T. No 24 V; replace controller.
  • Page 11 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED. ENVIRACOM TERMINALS. OPTIONAL OUTDOOR RESET MODULE AND OUTDOOR SENSOR SHOWN. M29687 Fig. 10. L7224U multizone system with circulator connections. 69-1720—03...
  • Page 12 ENVIRACOM™ TERMINAL 3 IS ALSO THE FIRST THERMOSTAT TERMINAL. OPTIONAL FEATURE ON SELECT MODELS. OPTIONAL OUTDOOR RESET MODULE AND OUTDOOR SENSOR. REFER TO DEVICE LABEL FOR WIRE COLOR CODE. M29686 Fig. 11. L7224U multizone system with circulator connections and EnviraCOM™ thermostat. 69-1720—03...
  • Page 13 ® L7224U OIL ELECTRONIC AQUASTAT CONTROLLER MATERIAL SAFETY DATA SHEET Section 1. Product And Company Manufacturer: Honeywell Inc. 1985 Douglas Drive North Identification Minneapolis, MN 55422. Product Name: Heat Conductive Compound Date Released: October 8, 1999 MSDS ID: DS9021 Customer Response Center: 800-328-5111...
  • Page 14 ® L7224U OIL ELECTRONIC AQUASTAT CONTROLLER Section 4. First Aid Measures Other Protective Equipment: None required. Eye Contact: Flush eyes with water for 15 minutes. Section 9. Physical and Chemical Remove any contact lenses and continue to flush. Obtain medical attention if irritation develops and Properties persists.
  • Page 15 ® L7224U OIL ELECTRONIC AQUASTAT CONTROLLER 69-1720—03...
  • Page 16 ® L7224U OIL ELECTRONIC AQUASTAT CONTROLLER Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2009 Honeywell International Inc.

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