Figure 18
Boiler wiring for float-type LWCO — component
locations for wiring diagram, Figure 16, page 26
Blocked vent safety switch (BVSS),
when required
In Canada, a blocked vent shutoff switch kit
must be installed (see parts list page 38). See Fig-
ure 15, page 25.
The BVSS wiring diagram in Figure 17 shows
boiler wiring only up to the burner disconnect.
For additional information, refer to manufacturer’s
instructions.
1. Locate and remove boiler junction box cover.
2. Locate wire nut with yellow and black wire (if more than one
exists, pick the one with black wire going to burner harness).
Clip the wire nut.
3. Strip 1/2" from the ends of both the black and the yellow
wires.
4. Clip the quick connects from the blue wires coming from the
BVSS Harness and strip 1/2" from the ends.
5. Using two wire nuts from the kit, wire the blue wires in series
with the black and yellow wires (see Figure 17).
6. Replace junction box cover.
7. Turn on power and verify safe operation of the appliance per
GO Boiler Manual.
8. Restore boiler to normal operation.
Connect wiring
(Float-type LWCO)
(continued)
Figure 17
BVSS wiring diagram (float-type LWCO)
120 vac field wiring
120 vac factory wiring
1
2
3
4
2
5
1
Pressure control wiring harness
2
Tankless heater control wiring
3
Burner disconnect plug
4
Burner wiring harness
5
Low water cutoff wiring harness (not furnished
on “A” boilers)
Part number 550-141-829/1211
27
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 —
Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
