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L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT
®
CONTROLLERS
68-0281—16 12
Fig. 10. L7224A,C single zone system with circulator and indirect water tank with EnviraCOM™ thermostat.
M32025B
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
OPTIONAL FEATURE ON SELECT MODELS.
REFER TO DEVICE LABEL FOR WIRE COLOR CODE.
VALVE IS OPTIONAL ON SPECIFIED MODELS.
1
2
3
C1
B1
ZC
L2
LINE
C2
ZR
L1
B2
T
T
3
3
3
2
2
2
1
1
1
SENSOR
LINE
VOLTAGE
CIRCULATOR
L7224
3
4
3
3
5
BURNER
MOTOR
IGNITER
VALVE
BURNER
MOTOR
IGNITER
VALVE
CAD
CELL
JUNCTION
BOX
TO REMOTE
ALARM
CIRCUIT
ENVIRACOM™
TERMINAL
TH9421C
R7184/R7284
LIMIT
L1
L2
2
CAD
CELL
T
T
3
2
1
L1
(HOT)
L2
1
LEGEND SCREW TERMINAL 1/4 IN. (6 MM) QUICK CONNECT TERMINAL
SOLDERLESS WIRE CONNECTION
ENVIRACOM™ TERMINAL 3 IS ALSO THE FIRST THERMOSTAT TERMINAL.
OPTIONAL OUTDOOR RESET MODULE AND OUTDOOR SENSOR.
W8735S1000 WIRED OUTDOOR RESET MODULE SHOWN.
DUU MUST BE SET TO “ON” ON THE AQUASTAT.
5
6
1 2 3 OT OT
C7089U1006
OUTDOOR
SENSOR
6
W8735Y1000 OR
W8735S1000
7
INDIRECT
TANK
CIRCULATOR
LINE VOLTAGE
INDIRECT
TANK AQUASTAT
L2
7
4