Honeywell L7224U User Manual

INSTALLATION INSTRUCTIONS
69-1720-03
L7224U
Oil Electronic Aquastat
®
Controller
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.
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
Number
Spud Size
in. (mm)
Insertion
in. (mm)
Insulation
in. (mm)
123869A 1/2 (12.7) NPT 3 (76.2) 1-1/2 (38.1)
123870A 3/4 (19.05) NPT 3 (76.2) 1-1/2 (38.1)
Table 2. Sensors for L7224U Controller.
Part Number
Length in.
(mm) Application
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)

Honeywell L7224U Specifications

General

Brand	Honeywell
Model	L7224U
Category	Controller
Language	English

Summary

APPLICATION

General Description

Provides electronic temperature sensing for oil-fired boilers, controlling circulator, burner, and boiler temperature.

INSTALLATION INSTRUCTIONS

Accessories and Components

Lists optional accessories and available wells/sensors for the L7224U controller installation.

INSTALLATION

Installation Steps and Mounting

Covers general installation steps, mounting options, and new installation procedures.

Safety Warnings

Highlights critical electrical shock hazard warnings and other safety precautions during installation.

INSTALLATION

Well-Mounted Installation

Details steps for installing the controller in a well-mounted configuration and sensor placement.

Flush-Mounted Replacement

Instructions for replacing a flush-mounted Aquastat controller and sensor.

INSTALLATION

Aquastat Replacement and Wiring

Instructions for replacing well-mounted Aquastats, sensors, and wiring safety considerations.

OPERATION

General Operation and States

Overviews controller function, operational states (Normal, High Limit, Low Limit, Error), and basic principles.

Settings, Display, and Features

Guides on adjusting settings, understanding the display, operating ranges, and key features.

Controller Functions

Details the specific functions of the High Limit, Low Limit, and Circulator controllers within the system.

CHECKOUT

System Checkout Procedure

Instructions to verify proper system operation after installation by observing at least one complete operating cycle.

TROUBLESHOOTING

LED Error Codes

Introduces the concept of LED error codes for diagnosing system issues.

Troubleshooting Guide

Provides a guide to diagnose and resolve system issues based on observed conditions and diagnostic checks.