resideo Aquastat L7224 Series User Manual

TECHNICIAN’S QUICK REFERENCE GUIDE
69-1957-03
L7224 Series Oil Electronic
Aquastat
®
Controller
(2012 Compliant)
The following service procedure provides a quick overview
for L7224 Series Controllers. For more information, refer to
forms 69-1720 L7224U Installation Instructions, 66-1202
Wireless Outdoor Reset Installation Instructions, 69-2335
Outdoor Reset Installation Instructions, and 69-2343
Domestic Hot Water Module Installation Instructions. This
control is compatible with both wireless and wired
AquaReset Outdoor Reset Controls.
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.
On the L7224U settings can be adjusted to best fit the
requirements of the application.
Additional settings options are available to define an
outdoor reset curve for those systems requiring Outdoor
Temperature Reset and other adjustable parameters.
IMPORTANT
Outdoor Temperature Reset should be limited to
those systems consisting of a cold start boiler
and may include an indirect tank for domestic hot
water.
Outdoor Temperature Reset should not be used
with tankless coil systems as the low limit
setting required in such systems may limit
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resideo Aquastat L7224 Series Specifications

General

Enclosure Rating	NEMA 1
Type	Aquastat
Application	High Limit, Low Limit, Circulator Control
Voltage	120 Vac or 240 Vac (depending on model)
Switching Action	SPDT (Single Pole Double Throw)
Sensor Element	Remote Bulb with Capillary Tube
Approvals	UL, CSA
Voltage Rating	120 Vac or 240 Vac (depending on model)
Control Modes	High Limit, Low Limit, Circulator Control