Weil-McLain SGO SERIES 4 OIL-FIRED STEAM BOILER SGO-6 User Manual

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Connect wiring (Float-type฀LWCO) (continued)

120 VAC ﬁeld wiring 120 VAC factory wiring

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 Semi-packaged and Knocked-

down boilers).

Part number 550-142-330/0421

SGO

OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 4 — Boiler Manual

SERVICE฀TECHNICIAN฀ONLY฀—฀read฀and฀follow฀completely.

Figure฀20 Boiler wiring for ﬂoat-type LWCO —

component locations for wiring diagram,

Figure 19, page 28

Figure฀21 BVSS wiring diagram (ﬂoat-type LWCO)

Blocked vent shutoff switch (BVSS),

when required

In Canada, a blocked vent shutoff switch kit

must be installed (see parts list page 42). See Fig-

ure 18, page 27.

When using the OVD damper kit, the BVSS is re-

quired, and is integrated into the damper harness

wiring.

When using the BVSS without the OVD damper, the

BVSS is wired directly to the junction box as follows.

The BVSS wiring diagram in Figure 21 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 21).

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.

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Weil-McLain SGO SERIES 4 OIL-FIRED STEAM BOILER SGO-6 Residential Boilers