Honeywell Aquastat L7224U Installation Instructions

L7224U Oil and Electric Boiler
Electronic Aquastat
APPLICATION
The EnviraCOM™ enabled L7224U Electronic Aquastat
Controller provides electronic temperature sensing in a
UL limit-rated controller with a single sensing probe. The
L7224U controls the circulator, oil or electric burner or
contactor, and boiler temperature.
The L7224U is "Outdoor Temperature Reset" ready,
which is enabled when connected to the W8735Y1000
wireless or W8735S1000 wired Outdoor Reset Kits. This
option is intended for all applications except for tankless
coil systems for domestic hot water.
The L7224U replaces the L8124A, L8124C, L7124U,
L7148A, L7248A,C, L7224A,C, and L8148A controllers
and is intended for residential applications.
The L7224U also complies with 2012 DOE regulations to
ensure efficiency is maximized without interfering with
domestic hot water demands.
IMPORTANT:
Use of Outdoor Temperature Reset on a tank-
less coil application requiring a Low Limit setting
may result in limited system effectiveness and
reduced efficiency.
The L7224U provides status and diagnostic
information through an LED display combined
with LED lights as well as EnviraCOM communi-
cations enabled thermostats and diagnostic
tools to enhance the diagnostic process.
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.
2012 DOE Compliance and Operation
®
Controller
INSTALLATION INSTRUCTIONS
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.
®
69-1720EFS-07