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

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Connect wiring — general information (continued)

Figure฀18 Blocked vent shutoff switch installation

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

Electric shock hazard – Turn off electri-

cal power supply at service entrance panel

before making any electrical connections to

avoid possible electric shock hazard. Failure

to do so can cause severe personal injury

or death.

In Canada, a blocked vent shutoff switch

kit must be installed (see replacement parts

list page 42). See Figure 28.

When using the OVD damper kit, the

BVSS is required, 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, page 31 shows

boiler wiring up to the burner disconnect. For addi-

tional information, refer to manufacturer’s installation

instructions.

After฀installing฀BVSS฀switch,฀proceed฀as฀follows

1. Disconnect power.

2. Install BVSS Switch Wiring Harness (P/N 591-391-

942, which is included in BVSS kit P/N 591-624-650)

as follows:

a. Remove cover from BVSS Box.

b. Install straight ﬁtting end of the harness on the

BVSS Box. Install elbow (90º) end ﬁtting on the

Boiler Junction Box (see Figure 18).

c. Install both the fork ends to the screw terminals

on the BVSS Switch as per the wiring diagram,

(see Figure 21, page 29).

d. Replace BVSS box cover.

To฀wire฀blocked฀vent฀shutoff฀switch,฀see:

Figure 19, page 28 for ﬂoat-type LWCO

Figure 22, page 30 for probe-type LWCO

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