Universal Electronic Aquastat L7224U1002 Training Module

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Universal Electronic AquastatL7224U1002Training
Module
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What you will learn

• L7224U Product Overview
• Key Features
• Installation
• Set Up
• Troubleshooting
• Product Cross Reference
• L7224U Advantages

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L7224U Universal Electronic Aquastat

• What is the L7224U1002?
• Universal electronic aquastat that provides
  circulator, burner and boiler temperature control
  with electronic temperature sensing.
• Provides status and diagnostic information
  through an LED display to enhance the diagnostic
  process.

One part number L7224U1002
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Aquastat Key Features
Electronic Aquastat L7224U1002

• Triple Aquastat (High, Low, Circulator Control)
• EnviraCOM communications enabled
• Electronic configuration
• Diagnostic updates through LED Display
• Provides multizone control
• Horizontal or vertical flange mounting

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L7224U Universal Electronic Aquastat

• Why choose the Honeywell L7224U1002?
• Universal Compatibility
• Replaces over 40 existing Honeywell controls
• Easy Installation
• Redesigned to simplify wiring
• Direct or remote mount
• Superior Performance and Accuracy
• /- 2 degree accuracy
• Multi-Function LED Display
• Speeds installation and troubleshooting
• Push button product set up configuration
• Get set point, temperature and diagnostic info
• EnviraCOMTM communications enabled
• Remote diagnostics

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Additional L7224U features

• Remote 48 sensors available
• One Amp slow-blow fuse
• Improved terminal layout and multiple knockouts
• Vertical, Horizontal, and Flush-Mounting -
  configurable for single-function use
• Low Limit can be disabled (cold start boiler
  applications)

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L7224U Features
Enviracom Terminals
Flush Mounting Tabs (2)
Push Buttons Configuration Access Diagnostic
Information
Thermostat Terminals
EnviraCOM Data port
Digital Display
Line Voltage Terminals
Keyed Sensor Connector
Capacitor
Multiple Sensor Holes
Transformer
Fuse
Relays
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Ranges and Ratings

• Setting Ranges /-2 Degree Accuracy
• High Limit 130 240F
• High Limit Differential
• (new feature) 5 20F
• Low Limit 110 220F
• Low Limit Differential 10 25F
• Electrical Ratings
• Voltage 120 VAC 60 HZ
• Burner 7.4 Amps
• Circulator 7.4 Amps
• Zone Controller (ZC) 7.4 Amps
• Environmental Ratings
• Temperature -30 F to 150 F
• Humidity 0 to 95 relative humidity

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Competitive Comparison L7224U

• No direct competition

• EnviraCOM
• Easy installation
• Accuracy
• Diagnostic info
• LED display

• Still a good solution, but without the additional
  features

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Installation
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Wiring of the L7224U
Well mounting PN 50001464-001 12 in. Included
in the box Flush mounting PN 50001464-005 48
in.
Keyed sensor connector plugs into circuit board
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Wiring of the L7224U -- Thermostat
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Wiring of the L7224U Line Voltage
ZR Power from zone relay to burner L1 Power
hot L2 Power neutral C2 Circulator
common B2 Burner common C1 Circulator
hot B1 Burner hot ZC Power to zone circulator
relay
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Set Up
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Set Up of the L7224U

• To adjust the settings
• Press the UP, DOWN, and I buttons simultaneously
  for three seconds
• Press the I button until the desired feature is
  displayed
• Then press UP and/or DOWN to move the set points
  to desired values
• After 60 seconds without any buttons pressed, the
  control automatically goes back to READ mode
• Display
• In RUN mode the Aquastat will flash boiler temp
  (bt) followed by the temperature
• To read settings press the I key to scroll
  thought the functions

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Set Point Adjustments
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Troubleshooting
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Troubleshooting L7224U Electronic Aquastats
(LED LIGHTS)
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Trouble-Shooting Digital Readout of System
Conditions
Run mode display shows boiler temperature

Display Text
Description Shows bt Boiler
Temperature HL High Limit LL Low Limit Hdf High
Limit Differential Ldf Low Limit
Differential tt Local Thermostat
Status tte Enviracom Thermostat Status brn Burner
Status cir Circulator Status Zc Zone
Control Zr Zone Request err Error Code f Degrees
Fahrenheit c Degrees Celsius
LED display
Push I button to see other values
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Troubleshooting L7224U Electronic Aquastats
(Digital Readout of System Conditions)
Run mode display shows boiler temperature
LED display
Technicians Quick Reference Guide 69-1957
Push I button to see other values
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Troubleshooting L7224U Electronic Aquastats
(Error Codes)

• Is there an error code on the display?
• Error
• Code Cause/Action
• Err 1 Sensor fault check sensor
• Err 2 ECOM fault check EnviraCOM wiring
• Err 3 Hardware fault replace control
• Err 4 B1 fault check B1 wiring/voltage
• Err 5 Low line voltage check L1-L2 110 Vac
• Err 6 Fuse check ECOM wires, replace fuse
• Err 7 EEPROM, HL, LL, Hdf, Ldf Reset to
  default values. Restore desired
  settings.
• Err 8 Repeated B1 fault (voltage present at B1
  when output is
• turned off) check
  B1 wiring/voltage

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Troubleshooting L7224U Electronic Aquastats
On Watch QuickLookTM 72

• For Honeywell EnviraCOM enabled equipment
• Read EnviraCOM Error Codes
• Line Voltage
• Aquastat Well Temperature
• The QuickLookTM 72 is available through
  www.onwatchinc.com

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Product Cross Reference
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Product Cross Reference

• Where do I find Honeywell universal electronic
  aquastat cross reference information?
• www.customer.honeywell.com
• Honeywell Application Selection and Cross
• Reference Guide Form 63-9575
• Honeywell Laminated Truck Visor Form 63-9581
• Honeywell Residential Technical Support
  1-800-468-1502

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Aquastat Cross Reference Table
This chart can be found in the Residential
Combustion Application Guide Form 63-9575
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www.customer.honeywell.com

• See Cross Reference Search box in right column.

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L7224U Advantages

• When promoting the Honeywell L7224U1002 keep
  these advantages in mind
• This Universal control replaces over 40 existing
  Honeywell controls.
• Save time searching for the exact replacement
  parts
• Stock less parts on the shelf and in the truck
• Installation is easy with this redesigned
  control.
• Wiring has been simplified
• Mounting choices - control can be direct or
  remote mount
• Performance and accuracy are superior to past
  controls.
• /- 2 degree accuracy
• The multi-function LED display means less time
  spent on installation and troubleshooting.
• Push button product set up configuration
• EnviraCOMTM communications enabled is an added
  advantage providing remote diagnostic
  capabilities.

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L7224U Universal Electronic Aquastat Knowledge
Test

• Now that you completed this training module, take
  the short quiz to test your knowledge.

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Test

• The L7224U provides temperature control of
  circulators, burners and boilers with electronic
  temperature sensing? T of F
• The L7224U is considered a single function
  aquastat which provides high limit and low limit
  control? T or F
• The L7224U is accurate within /- 2 degrees? T or
  F
• A 48 sensor is available to accommodate
  application requirements? T or F
• Setpoints are easily adjusted with the up and
  down push buttons? T or F

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Test

• The I button cycles through settings and
  conditions? T or F
• Error codes can be read only through the LED
  display? T or F
• The low limit can be disabled for a cold start
  boiler application? T or F
• Honeywell provides cross reference information
  for replacing over 40 existing controls? T or F
• The L7224U has a LED light that shows whether the
  burner is energized? T or F

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Answer Key

• T
• F
• T
• T
• T
• T
• F
• T
• T
• T