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WTGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 —
Connect wiring - vent
damper
1. WTGO Boiler models ending in "D", such as WTGO-3D,
require the installation of the Field Controls OVD-7 damper,
Weil-McLain part number 381-800-515.
2. When installing the boiler, wire all controls from vent damper
and thermal switch in accordance with the OVD damper
manual and the following wire diagrams.
3. Connect damper wires to the boiler as follows:
a.
Remove black wire (burner disconnect harness) from
the B1 terminal, and connect that wire to the Yellow
wire from damper, using a wire nut.
b.
Connect the orange wire from the damper to the B1
screw terminal.
c.
Connect the black wire from the damper to the L1
screw terminal.
d.
Connect the white wire from the damper to the L2
screw terminal.
e.
Connect the green wire from the damper to ground.
Figure 23
OVD Vent damper wiring diagram
28
SERVICE TECHNICIAN ONLY — read and follow completely.
Boiler Manual
Connect oil piping
General oil piping requirements
•
Location and installation of oil tanks, oil piping and
burners must follow:
•
NFPA 31 - latest edition, Standard for the Installation
of Oil-Burning Equipment.
•
In Canada, CSA B139, Installation of Oil-Burning
Equipment.
•
Local codes and regulations.
•
Information provided with burner and fuel pump.
•
If any part of fuel oil tank is above level of burner, instal-
lation of an anti-siphon device is highly recommended
to be used to prevent flow of oil in case of oil line break.
•
Support oil lines as required by codes.
•
Make tank connections with swing joints or copper tubing
to prevent breaking in case the tank settles. Make swing
joints so they will tighten as tank settles. Non-hardening
pipe joint compounds should be used on all threads.
Do not use Teflon tape as an oil pipe sealant. It
can cause valves to fail, creating hazards. Do not
use compression fittings.
•
Underground pipe must be run in a casing to prevent oil
leaking into ground or under floor. Check local codes for
information.
Oil piping connection at burner
See Figure 24 for recommended connection at burner, al-
lowing burner mounting door to swing open completely for
servicing.
Figure 24
Recommended oil piping connection to
burner
See local codes for appropriate
arrangement and piping of filter
control valves, etc , back to oil tank
Flare fitting
Part number 550-142-332/0421
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