Install Instructions

INSTALLATION
IMPORTANT NOTES FOR ALL PROBE INSTALLATIONS:
1. Be sure the probe is installed above the minimum safe water
level, as determined from the boiler manufacturer’s literature.
2. Be sure the probe extends into the boiler cavity so that contact
with the water is made.
3. Be sure the exposed portion of the stainless steel probe is a
minimum of 1/4” from any grounding surface inside the boiler
to prevent the probe from shorting (see Fig. 1).
Control Unit Mounting onto Probe (See Fig. 2):
1. Tighten the probe into the tapped location of the boiler with a
wrench, using bushing fl ats provided.
2. Make sure the heads of the two mounting screws in the probe
bushing are loosened approximately 1/8” from the bushing
surface.
3. Remove the fi rst lock washer/nut from the probe threads.
4. Orient the slotted holes in the control unit over the heads of the
mounting screws of the probe and turn control unit counter-
clockwise so that the ends of the slots are fully under the mounting
screw heads. Tighten mounting screws.
5. Replace the lock washer/nut onto probe and tighten
Use pipe thread sealant only for sealing probe threads. Do not
use tefl on tape. Use of tefl on tape can insulate probe electrically
and can cause improper device operation and damage to
equipment or property.
Use only the probe that is supplied with this control or
replacement probe P3S-1. Failure to do so could result in
improper operation, damage to the equipment and property, or
could cause an explosion resulting in serious injury or death.
LWCO WIRING DIAGRAM USING
BURNER CIRCUIT POWER SOURCE
FIG. 5
TERMINAL BLOCK CONNECTIONS
CLAMPING PLATE TERMINAL
FIG. 7
Wire insulation must be rated at 167º F
(75º C) or greater. Use at least 18 AWG
copper conductors, or as required by
code. Use of other wire or insulation
types could result in fi re causing property
damage or serious injury.
LWCO WIRING DIAGRAM USING
POWER SOURCE OTHER THAN
BURNER CIRCUIT
FIG. 6
2. Connect the neutral lead wire from the power source to terminal N.
3. Verify that factory installed jumper is present or connect an 18
AWG (min.) jumper wire from terminal H to terminal COM.
4. Connect the neutral wire of the power source to the neutral
side of the burner circuit (terminal N). Connect wire from the
hot side of the burner circuit to terminal NC.
5. Connect the neutral wire of the power source to the neutral side
of a water feeder or alarm. Connect wire from the hot side of
the water feeder or alarm to terminal NO.
Control Unit Wiring Using a Power Source Other than Burner
Circuit (See Fig. 8):
1. Remove factory installed jumper.
2. Connect the hot lead wire from the separate power source to
terminal H.
3. Connect the neutral lead wire from the separate power source
to terminal N.
4. Connect the hot lead wire from the burner circuit power source
to terminal COM.
5. Connect the neutral wire of the burner circuit power source to
the neutral side of the burner circuit. Connect wire from the hot
side of the burner circuit to terminal NC.
6. Connect the neutral wire of the burner circuit power source to
the neutral side of a water feeder or alarm. Connect wire from
the hot side of the water feeder or alarm to terminal NO.
Control Unit Wiring Using Harness Connection:
On 24 VAC models, a 3-pin connection is provided for connecting the
boiler wiring harness. When using the boiler harness connection,
be sure the factory installed jumper from H to COM is installed.
See Fig. 3 for location.
Replace cover on Control Unit and securely tighten.
NOTE: For 24 VAC models, LFx0243S, 24 VAC to be supplied by
an EXTERNAL Class 2 power source to terminals H and N. For
120 VAC models, LFx1203S, 120 VAC is supplied by an external
circuit to terminals H and N.
Control unit wiring using the burner circuit power source.
(See Fig. 5):
1. Connect the hot lead wire from the power source to terminal H.
Be sure the power source for Control Unit and burner circuit
are the same voltage. Make sure you are not introducing a
second voltage source into the burner circuit via the jumper.
This will bypass other operating limits, and/or safety controls,
which may result in property damage, personal injury, or death.
Note: Remote probe available
on remote probe models only.