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Fig. 6—L404 with a low voltage relay.
LOW VOLTAGE RELAY
L404
L1
(HOT)
1
POWER
1
24 VOLT
SUPPLY
THERMOSTAT
2
L2
THERM
LOAD
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
1
AS REQUIRED.
M8940
Fig. 7—L404F, L604A (jumper installed) used
as a high limit, with an alarm circuit.
SPDT
CONTROLLER
(LOW LIMIT)
2
W
B
R
L1
FLAME
(HOT)
SAFEGUARD
CONTROL,
POWER
1
MOTOR, OR
SUPPLY
OTHER LOAD
L2
L2
ALARM
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
BREAKS R TO W AND MAKES R TO B WHEN PRESSURE
2
FALLS TO SETPOINT MINUS DIFFERENTIAL.
M8937
L404A-D,F; L604A,L,M
INSTALLATION
Fig. 8—L404F, L604A (with jumper installed) or
L604M, used as a low limit, with an alarm
circuit.
SPDT
CONTROLLER
(HIGH LIMIT)
2
W
B
R
L1
FLAME
(HOT)
SAFEGUARD
CONTROL,
POWER
1
MOTOR, OR
SUPPLY
OTHER LOAD
L2
L2
ALARM
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
BREAKS R TO B AND MAKES R TO W WHEN PRESSURE
2
RISES TO SETPOINT.
M8938
Fig. 9—L404F, or L604 with jumper installed,
controlling an M644B motor.
SPDT
LINE VOLTAGE
CONTROLLER
TWO-POSITION MOTOR
WHITE
CLOSED
W
W1
(LOW FIRE)
RED
2
R1
R
BLUE
OPEN
B1
B
(HIGH FIRE)
L1
BLACK
(HOT)
L1
POWER
1
SUPPLY
BLACK
L2
L2
M644B
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
BREAKS R TO B AND MAKES R TO W WHEN PRESSURE
2
RISES TO SETPOINT.
M8939
Page 7
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