Assessments - 3, GPA: 3.3
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A vent pipe connector shall be supported for the design and weight of the material employed, to maintain clearances, prevent physical damage and separation of joints. A vent pipe increaser or reducer may be required for connecting the venter to the vent system. Smaller vent pipe sizes than a chimney-vented system may be used for the vent system. Route the vent pipe from the appliance to the venter using a minimum number of elbows as possible. The horizontal section of the vent pipe should have a slight upward slope from the appliance to the venter. For clearances to combustible materials, multiple appliance venting and other installation requirements, refer to the National Fuel Gas Code ANSIZ223.1, and/or any applicable local codes or appliance manufacturer’s installation instructions. GENERAL WIRING INSTRUCTIONS CAUTION: Disconnect electrical power before wiring power venter! The PVO is designed to be used with appliances with 120VAC control systems. Wire the venter motor and controls in accordance with the National Electric Code, and/or applicable local codes. 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 in contact with any heat source. All line voltage and safety control circuits, between the venter and appliance, MUST be wired in accordance with the National Electrical Code for Class 1 wiring, or equivalent methods. Refer to wiring diagrams B & C for typical wiring. For other wiring diagrams, please contact Field Control’s Technical Support. NOTE: When applying power to the PVO for the first time, the venter motor may, or may not, run for up to 10 minutes. This is normal, and will not affect the operation of the system. Page 5 Diagram B Diagram C Page 6 Page 7 MULTIPLE APPLIANCE SYSTEMS When using one PVO power venter to common vent more than one appliance, a Control Kit is required for each additional appliance. 1. Connect the negative pressure port of each air pressure fan proving switch on all Control Kits being used to the provided tee mounted on the PVO. (See Figure 4) 2. Remove the cap from the branch of the tee and use the ferrule and compression nut provided in the small envelope with the PVO to attach the connecting tube. 3. Refer to the instruction sheet included with each Control Kit for specific instructions for that kit, including wiring diagrams. ADJUSTMENTS AIR FLOW ADJUSTMENT NOTE: Before installing, refer to the General Installation Inspection to check for negative pressure problems in the building. 1. To adjust the power venter air flow, open the choke plate . to . of the way open. (See Figure 5) Follow the appliance manufacturer’s procedures for starting the heating appliance. 2. Adjust the thermostat to call for “Heat”. After the system has operated for several minutes to stabilize flue gas temperatures, use a draft gauge, velocity meter, or match test procedure to check for negative draft or up-draft at the heating appliance outlet or air flow into the draft hood. 3. Adjust the inlet choke damper on the power venter in or out to obtain the minimum air flow required to maintain draft. Then increase air flow slightly (10% over minimum air flow rate) to ensure proper venting. For power burners, adjust draft to proper over-fired draft. If using a barometric draft control, use the draft control to fine tune the system draft. 4. If proper draft has been established, secure the choke plate by tightening the screws on the inlet collar. 5. Shut off thermostat and check for residual heat spilling from the draft hood or draft control. If this occurs, increase the post purge time on the timer. NOTE: After proper venting has been established, it is recommended that a combustion test and a smoke test be performed to ensure maximum burner efficiency. Oil burner air adjustments should be set at a zero to a trace smoke at the highest or recommended CO2% setting set by heating equipment manufacturer. PRESSURE SWITCH ADJUSTMENT 1. With the venter air flow set and the appliance operating at the best operating efficiency, adjust the pressure switch by rotating the adjustment screw clockwise until the burner shuts off. 2. Rotate the adjustment screw counterclockwise until the burner fires. 3. Rotate the adjustment screw an additional . turn counterclockwise to insure proper switch setting. (See Figure 6) POST PURGE TIMER ADJUSTMENT To adjust the post purge time, refer to Figures 7 & 8. For timer that looks like Figure 7: Rotate the timer adjustment on the timer clockwise to increase the operation time. To decrease the operation time, rotate the timer adjustment counterclockwise. For timer that looks like Figure 8: Rotate the timer adjustment on the timer counterclockwise to increase the operation time. To decrease the operation time, rotate the timer adjustment clockwise. *Typical post purge time should...
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