Wiring Instructions - Field Controls OVD-4 Manual

Dim 'A'
Pipe removal
Pipe Size dimension
in inches in inches
4 3-1/2
(102mm) (89mm)
5 3-1/2
(127mm) (89mm)
6 4
(152mm) (102mm)
7 4-9/16
(178mm) (116mm)
8 5-9/16
(203mm) (141mm)
Keyway Diagram
I
NSTALLATION OF THE
1. The WMO-1 Blocked Vent safety shut off must be installed between the appliance flue collar and draft control.
(NOTE: The metal shielded cable wire harness from the WMO-1 safety switch and vent damper is only 24 inches
(609 mm)). Wire harness plugs into motor assembly. Push and lock keyed wire harness into motor assembly
receptacle. (See Keyway Diagram) Push and lock metal y-connector into strain relief bracket.
2. Drill or pierce a 3/4" diameter hole in the vent pipe near the appliance outlet. (See Figure 4)
3. The heat transfer tube must have the fiber gasket installed against the mounting plate before attaching the unit
to the vent pipe. Insert the heat transfer tube with gasket into the 3/4" diameter hole.
4. Secure the assembly to the vent pipe with a minimum of 4 sheet metal screws. The channel must be mounted
horizontally, unless specified differently by the appliance manufacturer. (See Figure 4)
WARNING:
Switch connection
channel must be
mounted
horizontally, unless
specified differently
by the appliance
manufacturer.
W I
IRING NSTRUCTIONS
Wire the vent damper and controls in accordance with the National Electrical Code, manufacturer's
recommendations and/or applicable local codes. THE UNIT MUST BE GROUNDED. Check ground circuit to make
certain that the unit has been properly grounded. The wiring should be protected by an over current circuit device
rated at 15 amperes. Caution must be taken to ensure that the wiring does not come into contact with any heat
source. All line voltage and safety control circuits, between the vent damper and the appliance, MUST be wired in
accordance with the National Electrical Code for Class I wiring or equivalent methods.
BEFORE STARTING WIRING, TURN OFF ALL ELECTRICAL POWER TO THE APPLIANCE AT THE
APPLIANCE SERVICE SWITCH OR CIRCUIT BREAKER!!
WMO-1 B V
LOCKED ENT
S S O
AFETY HUT FF
7
Layout C
Figure 4