Specification

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Venting
SYSTEM SETUP:
Figure 1 shows a typical oil-fired appliance and the expected ranges of several readings taken at various locations
in the system. Note: If a vent pipe reducer is required, use a smooth walled gradual reducer. Place it at the venter
inlet as shown in Figure 1.
1. Set the choke plate in the power venter, or extension kit, to its full open position. Set the draft control
adjustment weight to its midpoint position.
2. Adjust the thermostat so that the unit will run continuously. Allow the unit to operate for 5 to 10 minutes to
ensure stack temperature stabilization.
3. Find out the manufacturer's recommended over-fire or breach draft. Close the choke plate on the SWG
until the draft above the draft control reads approximately 0.04" w.c. greater than the recommended breach
draft. Example: If the appliance manufacturer recommends a 0.02" breach draft, adjust the choke plate to
get an approximate 0.06" draft above the draft control.
4. Adjust the barometric draft control to obtain the manufacturer's recommended draft over-fire or at the breach.
The draft control gate should be open approximately half its full swing during normal operation. This allows
the gate to swing open or closed depending on changes in atmospheric pressure or operating conditions.
5. If the proper draft cannot be obtained at the breech or if the gate does not open as described, then adjust the
choke plate in the SWG to reduce or increase the airflow. Re-adjust the draft control to obtain the required
draft, since moving the choke plate will change the system draft.
Procedure for adjusting the pressure switch
• Turn pressure switch adjustment clockwise until the burner quits.
• Turn counterclockwise slowly until the burner starts.
• Turn an additional
1
⁄4 to
1
⁄2 turn counterclockwise.
Note: Every installation will require unique pressure switch adjustment.
System Setup
Power Venter
Figure 1