6
STEP 4 - Control Wiring (continued)
E
H
1
2
3
4
5
BURNER
CIRCUIT
C
D
B
A
N
120 VOLT
CIRCUIT
• Hot wire (A) of 120 volt circuit to terminal (1).
• Connect Neutral wire (B) of 120 volt circuit to terminal (2).
• Connect wire (C) from beginning of Burner circuit
(thermostat, gas valve, limits, etc.) to terminal (5).
• Connect wire (D) from end of Burner circuit to terminal (2).
• Install wire (E) connecting (1) and (3).
c.
Based on the Boiler’s Control Circuit voltage and the required input voltage of the LWCO, select proper wiring
diagram and proceed to that page.
Boiler manufacturer schematics should always 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 an electrical fire or equipment damage,
electrical wiring must have a rating of 167˚F (75˚C) if the
liquid's temperature exceeds 180˚F (82˚C).
Failure to follow this warning could cause property
damage, personal injury or death.
!
WARNING
Models with Red (low water) and Amber (test) Lights
Models with Red (low water) and Green (power) Lights
LWCO Model
Boiler Circuit Voltage
Page
LWCO Model
Boiler Circuit Voltage
Page
PS-801-120
120V
7
PS-801-120
120V
8
PS-801-120
24V
7
PS-801-120
24V
8
PS-851-120
120V
7
PS-851-120
120V
8
PS-851-120
24V
7
PS-851-120
24V
8
N
P
M
d.
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).
Wiring Diagram Legends
1. Bold lines indicate action to be taken in Step shown.
2. Dotted black lines indicate internal wiring.
PS-801/851 with 120 Volt Burner Circuit with Red (Low Water) and
Amber (Test) Lights
