Lattner Boiler Company WLF 9.5 HP Instruction Manual page 44

WIRING DIAGRAMS
For Motorized Valves, refer to the valve manufacturer's wiring instructions.
Low Water Cut-Off Only
1. Main Line Switch - For burner circuits within the
switch's electrical rating.
LINE
1 2
Pump Control Only
1. Install a starter or relay in pump control circuit,
as shown, to prevent damage to snap switch
and help insure proper switch/control operation.
Failure to do so may shorten the life of the
switch when actual amperage exceeds
switch rating.
2. Connect wires from holding coil of pump starter
or relay to terminals 1 and 2 as shown.
NOTE: To help insure most effective operation,
balance boiler feed pump(s) to deliver required water
feeder rate to match boiler steaming requirements.
Alarm Circuit Only
1. Low Water Alarm
ALARM
1 2
Combination Pump Control, Low Water Cut-Off and Alarm
1. Main Line Switch - For burner circuits within
the switch's electrical rating.
SEE PUMP
CONTROL
CIRCUIT
1 2 4 5 6
TO BURNER CONTROL CIRCUIT
LOAD
4 5 6
NEUTRAL
HOT
4 5 6
HOT
ALARM
TO NEUTRAL
2. Pilot Switch - To holding coil of a starter when
the burner circuit exceeds the switch's electrical
rating.
OR
1 2 4 5 6
NOTE: For Model 159S, use terminals 5 and 6 from
starter or relay for pump # 2.
1 2 4 5 6
2. High Water Alarm
OR
NEUTRAL
HOT
1 2
2. Pilot Switch - To holding coil of a starter when
the burner circuit exceeds the switch's electrical
rating.
SEE PUMP
ALARM
CONTROL
CIRCUIT
OR
1 2 4 5 6
LINE
LOAD
LINE
LOAD
ALARM
4 5 6
LINE (3 PHASE)
LOAD
9