Honeywell L7248C User's Manual

Honeywell Thermostats User's Manual - L7248C.
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INSTALLATION INSTRUCTIONS

68-0281EFS-05

L7224A,C; L7248A,C,L

Oil Electronic 
Aquastat® Controllers

APPLICATION
The L7224A,C and L7248A,C,L 2012 Compliant Oil 

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 burner and boiler temperature. 

The L7224/L7248 is “Outdoor Temperature Reset” ready 

which is enabled when connected to the W8735S1000 

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 Control ers. 

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 Ful  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.

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