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L7224U OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT
SENSOR WIRES
Fig. 5. Replacement sensor installation.
Replacement Sensor Installation
Turn off all power and carefully disconnect sensor from
circuit board by pulling gently on the connector.
1. Gently pull sensor from thermo well and through
circuit board by pulling on leadwires.
2. Carefully align replacement sensor with hole in
circuit board and guide through Aquastat case and
into well. Refer to Fig. 5.
3. Make sure sensor is fully seated to bottom of well
(see Fig. 5). Use a small pencil to measure depth of
sensor in well, if necessary.
4. Connect sensor to circuit board by pressing
connector on sensor unit into mating connector on
circuit board (refer to Fig. 6).
5. For remote sensors (flush mounted Aquastat) be
sure to use the 121371AA clamp to securely hold
sensor in place. See Accessories.
T
T
3
2
1
ZR
L1
L2
C2
B2
C1
B1
ZC
Fig. 6. Wiring the Outdoor Reset Module and the
Domestic Hot Water Module.
Fuse
The 1 Amp fuse located near the transformer is intended
to protect the EnviraCOM circuit from incorrect wiring.
The Aquastat will continue to function should the fuse
blow or be removed though no EnviraCOM
communication will be possible on the bus and Err 6 will
be displayed. See Table 9.
69-1720EFS—13
BOILER
IMMERSION
SENSOR
WELL
HEAT-CONDUCTIVE COMPOUND
(OPTIONAL)
M22026
W8735Y1000 OR W8735S1000
OUTDOOR RESET MODULE
(W8735S1000 SHOWN)
1 2 3 OT OT
C7089U1006
OUTDOOR
SENSOR
W8735S1008
DOMESTIC HOT
WATER MODULE
1 2 3 TS TS
32003971-003
TEMPERATURE
SENSOR
®
CONTROLLER
WIRING
WARNING
Electrical Shock Hazard.
Can cause serious injury or death.
Disconnect power supply before making wiring
connections to prevent electrical shock or
equipment damage.
1. National Electrical Code, ANSI/NFPA 70, latest edi-
tion, and any additional national state or local
codes must be followed.
2. In Canada, CSA C22.1 Canadian Electrical Code
Part 1 and any local codes must be followed.
3. All wiring must be NEC Class 1.
4. Provide electrical ground at boiler as required by
codes.
5. If original wire supplied with boiler must be
replaced, it must be replaced with wire as deter-
mined by the boiler manufacturer's specifications.
6. Do not bundle the low voltage wire with the line
voltage wires.
7. The low voltage wires can be bundled together
IMPORTANT
The terminals on these Aquastat Controllers are
approved for use with copper wire only.
Line Voltage Connections
Use 14 AWG wire or larger wires.
Low Voltage Connections (T, T, and
EnviraCOM
1. Use 18-22 AWG wire.
2. Up to 300 ft.
3. Less than 100 mA current load.
OPERATION
General
The L7224U Oil Electronic Aquastat Controller is a
primary safety limit-rated device designed for use with
oil fired boilers with line voltage burners and circulators.
Many boilers do not include wiring or controller
compartments as part of the design, but are provided
with an integral, replaceable, immersion well that is the
mounting hardware for the Aquastat Controllers. Wiring
to the other controllers is done through flexible metal
conduit.
For boilers that do include a remotely (flush) mounted
M34961
controller, the wiring may be completed with conduit or
routed behind the boiler sheet metal.
A separate electromechanical High Limit is not required
in a system that uses this controller to meet
Underwriters Laboratories Inc. requirements for oil-fired
boiler assemblies, UL 726.
On the L7224U, the High Limit, High Limit Differential,
Low Limit, and Low Limit Differential and Anti-Short
Cycle time can be adjusted to the setting recommended
by the boiler OEM.
4
TM
1, 2, 3)