Xylem MM 414B Series 150E and 157E Low Water Cut-Off/Pump Controllers For Steam Boilers and Other Level Control Applications - Manual (Page 13)

13
Adjusting Burner Delay (DOB)
The boiler should begin to fill with water.
NOTE: If water does not start filling the boiler,
immediately turn off the the boiler and make
the necessary corrections.
For Automatic Reset Models:
When the water level reaches the level of the
middle probe, the burner circuit should be acti-
vated and the Red LED should turn off. (Pump
#2 should turn off with Dual Pump Applications).
For Manual Reset Models:
The reset button must be pushed to activate the
burner circuit when water reaches the level of the
middle probe.
When the water level rises to the level of the top
probe, the pump relay will be de-activated.
Depending on the application, this will either turn
off the pump or close a valve.
BCOM
BNC
BNO
PCOM
PNC
PNO
N
H
BCOM
BNC
BNO
PCOM
PNC
PNO
N
H
60
30 Secs
.
0
60
30 Secs
.
0
BCOM
BNC
BNO
PCOM
PNC
PNO
N
H
0
60
30 Secs
.
0
Probe Connections
Bottom
Red
Middle
Yellow
Top
Blue
0-60 Second Adjustable
Burner Off Delay
110 Volt Input
from Boiler
Circuit Manual Reset
(If applicable)
Low Water
LED
Red
Power
LED
Green
Test
Switch
Burner
Terminals
Pump
Terminals
BCOM
BNC
BNO
PCOM
PNC
PNO
N
H
Probe LED's
The number of seconds that water must be off the
bottom probe before the burner will turn off is
adjustable from 0 to 60 seconds with the unit factory
set at 0 seconds. To adjust, turn the adjusting screw
clockwise using a small flatblade screwdriver to the
delay time desired.
Follow the blow down procedure found on page 15
to verify operation.
INSTALLATION COMPLETE
If the delay time is too long, the manual reset sec-
ondary LWCO may turn off the boiler before this con-
trol turns off the boiler. If this occurs, shorten the time
delay by turning the adjustment screw counter-clock-
wise from the new setting.
NOTE