Install Instructions

LF SERIES WIRING CROSS REFERENCE
Power Connections Output Contacts Remote Probes
Manufacturer Device or Series Hot Neutral Common To Burner To Water
Feeder/
Alarm
Probe Probe
Reference
Taco LF & LT Series H N COM NC NO P GND
McDonnell & Miller PS-801/851 (Older
models w/ red & amber
LED's)
1 2 3 5 4 P or J2 Chassis GND
McDonnell & Miller PS-801/851 (New
models w/ red & green
LED's)
H N C B W J2 Chassis GND
McDonnell & Miller PS-802/852 (Older
models w/ red & amber
LED's)
HN C B W J7
Chassis GND
McDonnell & Miller PS-802/852 (New
models w/ red & green
LED's)
H N C B W J3 Chassis GND
McDonnell & Miller Series 750 1 2 3 4 5 P Chassis GND
McDonnell & Miller RB-122 H (Black
Wire)
N (White
Wire)
C (Yellow
Wire)
B (Yellow
Wire)
-- -
McDonnell & Miller RB-120 1 2 3 4 5 - -
McDonnell & Miller RB-24 Red Wire White Wire Yellow
Wire
Yellow Wire - - -
Hydrolevel 24 Black
Wire
White Wire - Orange
Wire
Brown Wire - -
Hydrolevel 170 H GN P1 P2 A - -
Hydrolevel 400,500,600,700,450,5
50,650,750
1 2 P1 P2 A H3 Chassis GND
Honeywell RW700 Series (Except
RW700A1098
L1 L2 - B A 2 Red
Wires,
White Wire
Green Wire
Honeywell RW700A1098 T1 T2 - B A 2 Red
Wires,
White Wire
Green Wire
Probe Only Ordering
P1
3S
Probe-LWCO
Process Connection
3 - 3/4” NPT
2 - 1/2” NPT
Probe Styles
S - Standard
R - Remote Probe w/ NEMA 4 Enclosure
1 - 12” Long Electrode (Remote, NEMA 4 Style)
2 - 24” Long Electrode (Remote, NEMA 4 Style)
Revision
LWCO Ordering
L
F1
A3S
1
2
0
Low Water Cutoff
F - Foam Compensating-Testable
Reset Type
A - Automatic Reset
M - Manual Reset
Input Power
024 - 24VAC
120 - 120VAC
Process Connection
3 - 3/4” NPT
2 - 1/2” NPT
Revision
Probe Styles
S - Standard
R - Remote Probe w/ NEMA 4 Enclosure
1 - 12” Long Electrode (Remote, NEMA 4 Style)
2 - 24” Long Electrode (Remote, NEMA 4 Style)