Weil-McLain SGO SERIES 4 OIL-FIRED STEAM BOILER SGO-7 User Manual

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

Part number 550-142-330/0421

SGO

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

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

Blocked vent shutoff switch (BVSS), when

required

In Canada, a blocked vent shutoff switch kit must be

installed (see parts list page 42). See Figure 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 24 shows boiler

wiring only up to the burner disconnect. For addi-

tional information, refer to manufacturer’s instruc-

tions.

1. Locate and remove boiler junction box cover.

2. Locate wire nut with two black wires (if more than one exists,

pick the one with black wire going to the burner harness).

Clip the wire nut.

3. Strip 1/2" from the end of both the black 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, connect the blue wires in series

with the two black wires (see Figure 24).

6. Replace junction box cover.

7. Turn on power and verify safe operation of the appliance.

8. Restore boiler to normal operation.

Figure฀23 Boiler wiring for probe-type LWCO —

component locations for wiring diagram,

Figure 22, page 30

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).

120 VAC ﬁeld wiring 120 VAC factory wiring

Figure฀24 BVSS wiring diagram (probe-type LWCO)

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Weil-McLain SGO SERIES 4 OIL-FIRED STEAM BOILER SGO-7 Residential Boilers