Connect Wiring - Blocked Vent; Shutoff Switch Option; Blocked Vent Shutoff Switch - Weil-McLain WGO 4 Series Manual

WGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 —
Connect wiring — blocked vent shutoff switch option

Blocked vent shutoff switch

In Canada, blocked vent shutoff switch kit
(see parts list page 34) must be installed.
See Figure 20.
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
Combination limit control as follows.
The wiring diagram in Figure 21 shows
boiler wiring only up to the burner
disconnect. For additional information,
refer to manufacturer's instructions.
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.
Figure 20
Blocked vent shutoff switch
installation
Part number 550-142-331/0421
SERVICE TECHNICIAN ONLY — read and follow completely.
After installing BVSS switch, proceed as follows:
1. Disconnect power.
2. Install Shutoff Switch (BVSS) 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
c. Install both the fork ends to the screw terminals on the BVSS
d. Replace BVSS box cover.
e. Locate Combination Control, remove cover, and disconnect red
f. If red wire from Step "e" has uninsulated female end, replace it
g. Connect female end of Shutoff Switch BVSS Harness (blue wire)
h. Connect male end of Shutoff Switch BVSS Harness to the red
i. Replace Combination Control Cover.
3. Turn on power and verify safe operation of the appliance.
4. Restore boiler to normal operation.
Figure 21
Boiler Manual
elbow (90º) end fitting on the right side of the Hydrolevel control.
Switch as per the wiring diagram, (see Figure 21).
wire from "B1" terminal.
with insulated female end as supplied in kit.
to "B1" terminal.
wire removed in Step "e".
BVSS wiring diagram
120 vac
field wiring
Low voltage
field wiring
120 vac
factory wiring
Low voltage
factory wiring
25