Submittal Sheet

L408J VAPORSTAT
®
CONTROLLERS
5 65-0287—01
*Terminal B omitted for miswiring compliance.
Fig. 3. L408J terminal blocks and internal schematic.
Fig. 4. L408J1009 or L408J1017 used as a high limit, with
an alarm circuit.
Fig. 5. L408J1025 or L408J1033 used as a low limit.
Fig. 6. L408J controlling a Series 61 Motor.
SETTING AND CHECKOUT
Setting
In all models, the differential is subtractive from the main scale
setpoint. The upper operating point is determined by the main
scale setpoint, while the lower operating point is determined by
the main scale setting less the differential setting. Operating
points are shown in Fig. 7.
Adjust the main scale setpoint for the desired operating
pressure by turning the main scale adjusting screw (see Fig. 8)
on the top of the case until the main scale setting indicator is at
the desired value. Adjust the differential setting by turning the
differential adjusting screw until the differential setting indicator
is at the desired value. The scales are marked in psi and kPa.
B
R
W
W
R
B
(OMITTED)
*
M22726
L408J1009,
L408J1017
BREAKS R-B,
MAKES R-W ON
PRESSURE RISE
TO SET POINT
L408J1025,
L408J1033
MAKES ON
PRESSURE RISE
TO SET POINT
M8938B
L1
(HOT)
L2
2
1
1
2
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
BREAKS R TO B AND MAKES R TO W WHEN PRESSURE
RISES TO SETPOINT.
L2
POWER
SUPPLY
FLAME
SAFEGUARD
CONTROL,
MOTOR, OR
OTHER LOAD
SPDT
CONTROLLER
(HIGH LIMIT)
W
R
B
ALARM
G
GROUND
M8937B
L1
(HOT)
L2
2
1
1
2
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
BREAKS R TO W WHEN PRESSURE FALLS TO SETPOINT
MINUS DIFFERENTIAL.
L2
POWER
SUPPLY
FLAME
SAFEGUARD
CONTROL,
MOTOR, OR
OTHER LOAD
SPST
CONTROLLER
(LOW LIMIT)
W
R
G
GROUND
R
B
W
R
W
B
T2
T1
L1
(HOT)
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
TRANSFORMER MAY BE INTERNAL OR EXTERNAL
TO MOTOR.
M17095GR
L408J
CONTROLLER
SERIES 61
MOTOR
1
2
1
2