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Honeywell L7224A User Manual

Honeywell L7224A
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INSTALLATION INSTRUCTIONS
68-0281-16
L7224A,C; L7248A,C,L
Oil and Electric Boiler
Electronic Aquastat
®
Controllers
APPLICATION
The L7224A,C and L7248A,C,L 2012 Compliant
Electronic Aquastat
®
Controllers provide electronic
temperature sensing in a UL limit-rated control with a
single sensing probe. The L7224A,C and L7248A,C,L
control the circulator, oil or electric burner or contactor,
and boiler temperature. The L7224/L7248 is “Outdoor
Temperature Reset” ready which is enabled when
connected to the W8735Y1000 wireless or W8735S1000
wired Outdoor Reset Kit. Outdoor Reset with the L7224/
L7248 is intended for all applications except for tankless
coil systems for domestic hot water. Compliance to 2012
DOE regulation ensures efficiency is maximized without
interfering with domestic hot water demand.
The L7224A,C and L7248A,C,L replace the L8124A,
L8124C, L7124A,C, L7148A and L8148A Controllers.
The L7224A,C and L7248A,C,L series controls provide
status and diagnostic information through an LED display
combined with LED lights as well as EnviraCOM™
communications enabled thermostats and diagnostic
tools to enhance the diagnostic process.
L7224/L7248 Aquastat Controllers are intended for use
in residential-type applications.
IMPORTANT
Use of Outdoor Temperature Reset on a tank-
less coil application requiring a Low Limit setting
will result in reduced system effectiveness and
efficiency.
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.
2012 DOE Compliance and Operation
Operation of this control may delay the burner operation while the residual heat is
circulated out of the boiler.
NOTE: This operation may be different than earlier electronic Aquastat
®
revisions which did not implement thermal purge.

Questions and Answers:

Honeywell L7224A Specifications

General IconGeneral
BrandHoneywell
ModelL7224A
CategoryController
LanguageEnglish

Summary

Application Overview

Specifications

Electrical Ratings

Details voltage, frequency, and power consumption for the Aquastat controllers.

Environmental Ratings

Specifies operating temperature and humidity limits for the Aquastat controllers.

Approvals

Lists recognized component approvals from Underwriters Laboratories Inc. and Canadian UL.

2012 DOE Compliance and Operation

Installation Guide

Mounting

Describes various mounting options for the L7224A,C and L7248A,C,L models.

New Installation Procedures

Flush-Mounted Aquastat Replacement

Instructions for replacing a flush-mounted Aquastat controller.

Well-Mounted Aquastat Replacement

Instructions for replacing a well-mounted Aquastat controller.

Replacement Sensor Installation

Wiring Instructions

Fuse Protection

Explains the function of the 1 Amp fuse protecting the EnviraCOM circuit.

Operation Modes

High Limit Controller Operation

Describes how the High Limit function controls the burner based on water temperature.

Low Limit and Circulator Controller

Explains the interaction between Low Limit setting, differential, burner, and circulator.

Anti Short-Cycle Feature

Details the feature that provides a delay time between burner cycles.

Thermal Purge Features

Thermal Purge Settings

Details configurable parameters for thermal purge, including temperature and time delay.

System Checkout and Troubleshooting

Checkout Procedure

Guidance on observing system cycles to ensure proper controller operation.

Troubleshooting with LED Display

Instructions on using the LED display and error codes for diagnosing issues.

Controller Operating Sequences

Sequence with Multiple Zones (ZR)

Operating logic when the ZR terminal is connected for multiple zones.

Sequence with External Low Limit (ZR)

Operating logic when ZR terminal is used for external low limit.

Sequence with Domestic Hot Water (ZR)

Operating logic when ZR terminal is used for domestic hot water.

Error Codes and Troubleshooting Guide

LED Error Codes

Defines various Aquastat and EnviraCOM LED error codes and their causes/actions.

Troubleshooting Guide Table

Provides diagnostic conditions, checks, and actions for common system issues.

Wiring Diagrams

Single Heat Zone with Outdoor Reset Module

Wiring diagram for single heat zone with optional Outdoor Reset Module.

Multizone System with Circulator Connections

Diagram showing multizone setup with circulator connections.

Single Zone System with EnviraCOM Thermostat

Wiring diagram for single zone with circulator and indirect tank using EnviraCOM thermostat.

L7248L Multizone System with Circulator Connections

Wiring diagram for L7248L multizone system with circulator connections.

L7248L External Low Limit Connections

Wiring diagram illustrating external low limit connections for the L7248L model.

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