Universal Electronic Aquastat®L7224U1002

Training Module

Includes Honeywell’s AquaReset® Outdoor Reset Solution

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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 in an oil fired hydronic heating appliance.

- 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)

• Outdoor reset ready

• 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• Easily add outdoor reset with 3 wires• Remote diagnostics• OnWatch Diagnotic compatible

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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)

•Outdoor reset functionality enabled when combined with W8735S1000 AquaReset® kit

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L7224U Features

ThermostatTerminals

Digital Display

Capacitor

Keyed SensorConnector

Transformer

Fuse

Relays

Flush MountingTabs (2)

Line VoltageTerminals

PushButtons – Configuration& Access Diagnostic Information

EnviraCOM Data port

Multiple Sensor Holes

Enviracom™Terminals

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Ranges and Ratings

• Setting Ranges +/-2 Degree Accuracy- High Limit: 130 – 240°F - High Limit Differential (new feature): 5 – 20°F- Low Limit: 110 – 220°F- Low Limit Differential: 10 – 25°F

• 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

Installation

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Wiring of the L7224U

Keyed sensor connector plugs into circuit board

Well mounting PN 50001464-001 12 in.Included in the box

Flush mountingPN 50001464-005 48 in.

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Wiring of the L7224U -- Thermostat

ThermostatTerminals

3

2

1

T

T

Enviracom™Terminals

Connect AquaReset® and otherEnviracom devices

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Wiring of the L7224U – Line Voltage

Line VoltageTerminals

ZR Power from zone relayto 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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Connecting AquaReset®

ThermostatTerminals

3

2

1

T

T

Enviracom™Terminals

Wire 1,2,3 terminals on Aquastat to 1,2,3 terminalsto the Outdoor Reset Module

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Connecting AquaReset®

Outdoor SensorTerminals

Wire 1,2,3 terminals on Aquastat to 1,2,3 terminalsto the Outdoor Reset Module. Mount outdoor sensor

Outside and connect wires to the OT terminals

Enviracom™Terminals

1 2 3 OTOT

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

I

Increase valueof setting

Decrease valueof setting

Cycles through Settings & conditions

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Set Point Adjustments

I

Increase valueof setting

Decrease valueof setting

Cycles through Settings & conditions

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L7224U Electronic Aquastats® (LED LIGHTS)

ThermostatCalling

EnviraCOMNetwork Active

Power toZone Circulator

Interrupted

CirculatorPowered

BurnerEnergized

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Digital Readout of System Conditions

Run mode – display shows boiler temperature

Push “I” buttonto see other values

LED display

DisplayText 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

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DisplayText Description Shows

duu ZR configured as Domestic

Hot Water Request

ASC Anti Short-Cycle timeout

bSP Boiler Setpoint

dhc DHW module connected

ot Outdoor temperature

otL Outdoor temperature low

otH Outdoor temperature high

btL Boiler temperature low

bP Boost Period

bS Boost step

UUS Warm weather shutdown

temperature

Digital Readout of System Outdoor Reset Functions

Push “I” buttonto see other values

LED display

The following messages are only available when connected to a W8735S1000 outdoor reset kit and/or W8735S1008 domestic hot water priority kit

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L7224U Electronic Aquastats® (Digital Readout of System Conditions)

Push “I” buttonto see other values

LED display

Run mode – display shows boiler temperature

Technicians Quick

Reference Guide #69-1957

Troubleshooting

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• Is there an error code on the display?

ErrorCode 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

Troubleshooting: L7224U Electronic Aquastats® (Error Codes)

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• Is there an error code on the display?

ErrorCode Cause/Action• Err 9 Outdoor reset system failure, check wiring• Err 10 Boost Failure, check outdoor reset curve settings• Err 11 Domestic Hot Water module failure, check wiring

• Error codes 9, 10 and 11 only apply when AquaReset and/or Domestic Hot Water priority modules connected to Aquastat

Troubleshooting: L7224U Electronic Aquastats® (AquaReset Error codes)

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Troubleshooting: L7224U Electronic Aquastats®

• For Honeywell EnviraCOM™ enabled equipment

- Read EnviraCOM™ Error Codes

- Line Voltage

- Aquastat Well Temperature- The QuickLookTM 72 is available through www.onwatchinc.com

On Watch QuickLookTM 72

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 63-9581O

- Honeywell Residential Technical Support: 1-800-468-1502

63-9581O 63-9575

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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

1. The L7224U provides temperature control of circulators, burners and boilers with electronic temperature sensing? T of F

2. The L7224U is considered a single function aquastat which provides high limit and low limit control? T or F

3. The L7224U is accurate within +/- 2 degrees? T or F

4. A 48” sensor is available to accommodate application requirements? T or F

5. Setpoints are easily adjusted with the up and down push buttons? T or F

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Test

6. The “I” button cycles through settings and conditions? T or F

7. Error codes can be read only through the LED display? T or F

8. The low limit can be disabled for a cold start boiler application? T or F

9. Honeywell provides cross reference information for replacing over 40 existing controls? T or F

10.The L7224U has a LED light that shows whether the burner is energized? T or F

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Answer Key

1. T2. F3. T4. T5. T6. T7. F8. T9. T10.T