McDonnell & Miller Uni-Match WFE-24, Instruction Manual

3

Boiler manufacturer schematics should be followed. In
the  event that the boiler manufacturer's schematic does
not exist, or is not available from the boiler manufacturer,
refer to the schematics provided in this document.

IMPORTANT

To prevent electrical shock, turn off the
electrical power before making electrical
connections.
Failure to follow this warning could cause
property damage, personal injury or death.

WARNING

Terminal Connections

N

P

M

For all wire connections to the terminal block (M).
1. Strip about 1/3" (8.5 mm) of insulation from the wire.
2. Loosen the terminal screw (N) but DO NOT 

REMOVE. Move the wire clamping plate (P) back 
until the plate touches the back side of the screw head.

3. Insert the stripped end of the wire under the wire 

clamping plate (P) and securely tighten the 
terminal screw (N).

Do not use automatic water feeders with manual reset
LWCO's. Failure to follow this warning could cause
flooding, property damage, personal injury or death.

WARNING

Unless otherwise noted, water feeder voltage should be
the same as the LWCO and burner circuit voltage.

NOTE

Before wiring water feeder, operate boiler and check all
safety devices.

NOTE

Wire must be 18 AWG (min) or as required by local code.
Wire insulation rating must be at least 167˚F (75˚C)

NOTE

STEP 2 - Electrical Installation

Feeder Model

LWCO Model

Diagram Number

Page

WFE-24

PS-802 with burner wiring harness

1

4

WFE-24

PS-802 with burner terminal connections

1

4

WFE-24

67 w/24 volt burner circuit

4

4

WFE-24

67 w/120 volt burner circuit

6

4

WFE-24

67G (millivolt burner circuit)

9

5

WFE-120

PS-801 with numbered terminals

2

4

WFE-120

PS-801 with lettered terminals

3

4

WFE-120

67 w/24 volt burner circuit

7

4

WFE-120

67 w/120 volt burner circuit

5

4

WFE-120

67G (millivolt burner circuit)

8

5

WFE-24

Hydrolevel 400

10

5

WFE-24

Hydrolevel CG400

11

5

WFE-120

Hydrolevel 450

12

5

WFE-120

Hydrolevel CG450

13

5

WFE-120

Hydrolevel CGT450

14

6

WFE-24

Honeywell LWCO (24 volt)

15

6

WFE-120

Honeywell LWCO (120 volt)

16

6

WFE-24

TACO LWCO (24 volt)

18

6

WFE-120

TACO LWCO (120 volt)

17

6

Wiring Diagram Selection Chart

Based on the water feeder and low water cut-off combination you are installing, select proper wiring 
diagram and proceed to that page.

WFE-24

PSE-802 with burner wiring harness

1

4

WFE-24

PSE-802 with burner terminal connections

1

4

WFE-120

PSE-801 with lettered terminals

3

4