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SENSOR WIRES
CONTROLLER CASE
IMMERSION
WELL CLAMP
IMMERSION WELL
CLAMP SCREW
Fig. 2. Position of sensor in immersion well.
L7124U UNIVERSAL OIL ELECTRONIC AQUASTAT® CONTROLLER
BOILER
IMMERSION
SENSOR
WELL
HEAT-CONDUCTIVE COMPOUND
(OPTIONAL)
M16120
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.
All wiring must comply with local electrical codes and
ordinances. Do not exceed the specifications in the
Application section when wiring this control.
IMPORTANT
The terminals on these Aquastat® Controllers
are approved for use with copper wire only.
Follow the appropriate wiring diagrams shown on the
inside of the front cover of the L7124U or in Fig. 3 and 4.
L1
(HOT)
L1
T1
SENSOR
LINE VOLTAGE
CIRCULATOR
LINE VOLTAGE OIL
BURNER RELAY
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
CONTROL CASE MUST BE CONNECTED TO EARTH
GROUND. USE GROUNDING SCREW PROVIDED.
Fig. 3. L7124U single zone connections.
3
L2
LOW VOLTAGE
2
THERMOSTAT
1
T
T
TSTAT
L2
PWR
HIGH
LIMIT
SENSOR
DIFF.
2
LL
1
LOW
LIMIT
DSBL
C
ZC
B
ZC
C1
C2
ZR
B2
LEGEND:
69-1232—2
B1
= LED
M17776
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