Field Controls Ventilation Hood PVO 300 User Manual

POWER VENTER SYSTEM  
Model: PVO-300, PVO-600  
Included is one ETL and cETL listed Power Venter to be used primarily with a  
single 120VAC controlled oil fired furnace, boiler, or water heater. The PVO  
may be used to common vent multiple appliances with the addition of a Control  
Kit. Please consult Field Control’s Technical Support for other options.  
TYPICAL VENTING SYSTEM COMPONENTS  
One PVO Series Power Venter with pre-wired controls; adjustable post  
purge relay timer, adjustable draft proving switch, direct access terminal  
blocks, and piping tee for multiple appliance systems.  
• Side Wall Vent Hood (Not included)  
• Spill Switches (Not included)  
• CK-Series Control Kit for multiple appliance venting (Not Included)  
CONTENTS  
PAGE  
Unit Specifications  
System Operation  
2
2
Power Venter Sizing  
3
Installation Safety Instructions  
Installation of Power Venter  
General Wiring Instructions  
Airflow Adjustments  
4
5
5-6  
7
Pressure Switch Adjustments  
Post Purge Timer Adjustments  
Multiple Appliance Systems  
General Installation Inspection  
Maintenance  
7
7
7
8
8
Replacement Parts List  
Venting System Operational Information  
Installation Information  
9
10  
10  
This device MUST be installed by a qualified agency in accordance with the manufacturers installation  
instructions.  
The definition of a qualified agency is: any individual, firm, corporation or company which either in person or through a representative is  
engaged in, and is responsible for, the installation and operation of gas appliances, who is experienced in such work, familiar with all  
the precautions required, and has complied with the requirements of the authority having jurisdiction.  
DO NOT DESTROY  
THESE INSTRUCTIONS MUST REMAIN WITH EQUIPMENT  
2630 Airport Road · Kinston, NC 28504  
Phone: 252-522-3031· Fax: 252-522-0214  
 
POWER VENTER SIZING  
In order to choose the correct size power venter for a particular installation, the total input firing rate and total equivalent  
length of vent pipe to be used must be known. Refer to Table 2 to determine the maximum allowable equivalent feet of  
pipe for each model used with the pipe diameters shown. When venting multiple appliances, add the input of each  
appliance to determine the total input. Always choose a power venter that is capable of handling more than the system  
requires. The choke plate can be adjusted to compensate for the difference.  
Table 2  
MAXIMUM EQUIVALENT HORIZONTAL PIPE LENGTH (FEET)  
VENTER MODEL NO. AND VENT PIPE DIAMETER  
BTU/HR INPUT  
PVO-300  
5”  
PVO-600  
4”  
287  
150  
75  
6”  
---  
5”  
---  
6“  
---  
8”  
---  
0.75  
1.00  
1.50  
2.25  
3.00  
3.75  
4.00  
---  
257  
120  
51  
346  
172  
70  
428  
212  
86  
---  
---  
---  
---  
---  
143  
74  
51  
---  
211  
116  
84  
---  
---  
---  
46  
---  
---  
---  
---  
---  
---  
---  
---  
77  
PROCEDURE FOR CALCULATING TOTAL EQUIVALENT PIPE LENGTH IN FEET  
1. Calculate the total equivalent feet for each type of fitting used in the venting system from the following chart.  
2. Calculate the total amount of feet for the straight lengths of vent pipe.  
3. Add the equivalent feet for the fittings with the total amount of feet of straight lengths.  
Table 3  
EQUIVALENT LENGTH (FEET) OF VENT PIPE FOR VENT PIPE FITTINGS  
VENT PIPE DIAMETER  
VENT PIPE FITTINGS  
3”  
19  
5
4”  
25  
7
5”  
31  
9
6”  
38  
11  
5
7”  
44  
12  
6
8”  
50  
14  
7
9”  
56  
16  
8
10”  
63  
18  
9
TEE  
90° ELBOW  
45° ELBOW  
3
4
4
1/4  
1/2  
3/4  
8
11  
7
14  
8
17  
10  
4
19  
12  
4
22  
13  
5
25  
15  
6
28  
17  
6
REDUCER  
(d/D)*  
5
2
3
3
*Reducer or increaser ratio (d/D) small diameter divided by the larger diameter. (See Figure 3)  
Example: 4" to 8" reducer, the reducer ratio is d/D = 4/8 = 1/2. To estimate the equivalent foot  
length for the fitting, use the smaller pipe diameter for the equivalent length figure. Example:  
4" to 8" reducer; the reducer ratio is 1/2 and the smaller pipe diameter is 4". So, from the chart,  
the equivalent feet would be 7 feet.  
Example: System Pipe Size = 4"  
Step 1  
Step 2  
Step 3  
2 – 90° Elbows (4") = 14 Ft.  
10 - 2 Ft. Lengths of 4" Pipe = 20 Ft.  
Total Equivalent Feet = 14 Ft. + 20 Ft. = 34 Ft.  
Figure 3  
Page 3  
 
Diagram A  
INSTALLATION SAFETY INSTRUCTIONS  
CAUTION: This device must be installed by a qualified installer in accordance with the manufacturer's installation  
instructions. Appliances should have a minimum of 75% combustion efficiency or have a maximum measured flue gas  
temperature of 550°F at the inlet of the venter.  
1. The power venting system must be installed by a qualified installer. "Qualified Installer" shall mean an individual who  
has been properly trained or a licensed installer. The installer must write or imprint his name, phone number and date  
of installation on the installation tag. The tag should be attached to the power venter unit. Recording burner and  
venting system initial operational information is recommended as a guide for service or burner tune-up. Enter this on  
the back page of this manual.  
2. Safety inspection of a venting system should be performed before and after installing a power venting system on an  
existing or new appliance. Procedures to follow are those recommended by the National Fuel Gas Code,  
A.N.S.I.Z223.1 or refer to the "General Installation Inspection" section of this manual.  
3. Plan the vent system layout before installation to avoid the possibility of accidental contact with concealed wiring or  
plumbing inside walls.  
4. Single wall vent pipe may be used to join an appliance to the venting system, but if proper clearances cannot be  
maintained from combustible materials, Class B Vent Pipe should be used for gas appliances. Refer to national or  
local codes for guidelines.  
5. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.  
6. This equipment is designed to overcome minor negative pressure conditions. To ensure extreme negative pressure  
does not exist, follow the "General Installation Inspection" section of this manual.  
7. Heating appliances equipped with draft hoods, such as boilers or furnaces, LP and natural gas appliances SHOULD  
have a secondary spillage switch installed. On appliances without draft hoods, it is recommended that the secondary  
safety switch GSK-3 be installed into the system. Gas-fired 30 millivolt power systems MUST be equipped with a  
spillage switch.  
8. Air flow adjustment MUST be made to ensure appliance efficiency. This should be done at the appliance exhaust  
outlet with a velocity meter, draft gauge or by the "match test procedure". The match test is in accordance with  
National Fuel Gas Code A.N.S.I.Z223.1, Section 8.6.  
9. On heating appliances not equipped with a draft hood, a barometric draft control MUST be installed to regulate proper  
air flow and fluctuations in the system's air flow during operation. Fluctuations can come from wind loads on the outlet  
of the venter, house depressurization during windy days and the different house ventilation requirements between  
summer and winter operation. Use a Field Controls Type MG-1 Barometric Draft Control. Gas-fired draft induced  
systems should have a single-acting or double-acting barometric draft control installed.  
Page 4  
 
INSTALLATION OF POWER VENTER  
CAUTION: Failure to install, maintain and/or operate the power venting system in accordance with manufacturer's  
instructions will result in conditions which may produce bodily injury and/or property damage.  
1. Remove power venter from box and inspect unit for damage. If the carton has been crushed or mutilated, check unit  
very carefully for damage. Rotate venter wheel to insure that the motor and venter wheel rotate freely. DO NOT install  
if any damage is apparent. Refer to unit sizing chart to check proper venting sizing.  
2. Location of the termination of the venting system should be installed in accordance with the National Fuel Gas Code,  
A.N.S.I.Z233.1, manufacturer's recommendations, and/or local codes which are applicable. See the following  
requirements or refer to Diagram A for typical locations.  
a. The exit termination of mechanical draft systems shall not be less than 7' above grade when located adjacent to  
public walkways.  
b. A venting system shall terminate at least 3' above any forced air inlet located within 10'.  
c. The venting system of other than a direct vent appliance shall terminate at least 4' below, 4' horizontally from, or 1'  
above any door, window, or gravity air inlet into the building. When venting oil fired equipment with a Field  
Control’s CAS-2 series Airboot® kit, the intake air hood can be mounted within 12 inches of the power venter  
exhaust.  
d. The vent termination of a direct vent appliance with an input of 50,000 BTU/Hr or less, shall be located at least 9"  
from any opening through which vented gases could enter the building. With an input over 50,000 BTU/Hr, a 12"  
termination clearance shall be required.  
e. The vent termination point shall not be installed closer than 3' from an inside corner of an L-shaped structure.  
f. The vent termination should not be mounted directly above or within 3' horizontally from an oil tank vent or gas  
meter.  
g. The bottom of the vent terminal shall be located at least 12" above finished grade.  
CONNECTING VENTER TO APPLIANCE  
The venting system should be installed and supported in accordance with the National Fuel Gas Code ANSIZ223.1, or in  
accordance with any local codes. 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  
 
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.  
Figure 4  
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 ½ to ¾ 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.  
Figure 5  
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.  
Figure 6  
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 ¼ 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.  
Figure 7  
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 be between 3 to 5 min.  
Figure 8  
Page 7  
 
GENERAL INSTALLATION INSPECTION  
Follow recommended procedures for safety inspection of a heating appliance in accordance with the National Fuel Gas  
Code A.N.S.I. Z223.1. The following procedure will help in evaluation of the venting system. It is intended as a guide to  
aid in determining that the appliance is properly installed and is in a safe condition for continuous use. This is a  
generalized procedure which cannot anticipate all situations. Accordingly, in some cases deviation from this procedure  
may be necessary to determine safe operation of the equipment. If it is determined that a condition which could result in  
unsafe operation exists, the appliance should be shut off and the owner advised of the unsafe conditions. Corrections  
must be made prior to allowing continuous operation. The following steps should be taken in making a safety inspection.  
1. Visually inspect the venting system for proper size and determine that there is no blockage, restriction, leakage,  
corrosion, or other deficiencies which could cause unsafe operation.  
2. To the extent possible, close all building doors, windows, and all doors to the room in which the heating appliance is  
located. Turn on clothes dryers and any exhaust fans so that they operate at maximum speed. Do not operate a  
summer exhaust fan. Also close all fireplace dampers. If after completing steps 3 through 7 it is believed that sufficient  
combustion air is not available, refer to the National Fuel Gas Code A.N.S.I. Z223.1 or any local codes for proper  
guidelines.  
3. Place the appliance being inspected into operation. Follow the lighting instructions and adjust the thermostat so that  
the heating appliance will operate continuously.  
4. Determine that the burner is operating properly and that the main burner ignition functions satisfactorily, by  
interrupting the electrical power of the appliance in any safely convenient manner. Test the burner safety device to  
determine if it is operating properly by extinguishing the pilot or disconnecting the flame safety circuit.  
5. Visually determine that the main burner is burning properly, i.e. no floating, lifting, or flashbacks. Adjust the primary air  
shutter as required by the appliance manufacturer. If the appliance is equipped with high and low flame control or  
flame modulation, check for proper main burner operation at both flame levels.  
6. If appliances are equipped with high and low flame control or flame modulation, check for proper main burner  
operation at low flame.  
7. Test for exhaust gas spillage at the draft hood or the barometric draft control after approximately 5 minutes of main  
burner operation. Use a draft meter or flame or smoke from match, candle or cigarette. If spillage occurs, adequate  
air is not available. Shut off heating appliance thermostat and check for spillage around the draft hood, barometric  
draft control or burner inlet air location after power venter has stopped operation. If a flow reversal is noticed, house  
depressurization is occurring and make up air is required. For oil-fired systems, this may be noticed by oil fume smell  
after post purge cycle.  
8. Turn on all fuel burning appliances within the same room so that they operate at their maximum capacity. Then repeat  
Steps 5 and 7.  
9. Return all doors, windows, exhaust fans, fireplace dampers, and any other fuel burning appliances to their previous  
condition.  
MAINTENANCE  
1. Motor: Inspect the motor once a year - motor should rotate freely. To prolong the life of the PVO-600 motor, it must  
be lubricated with six drops of SWG Superlube, Part #46226200, annually. The PVO-300 has sealed ball bearings,  
and therefore does not need to be oiled.  
2. Blower Wheel: Inspect the blower wheel annually to clear any soot, ash or coating which inhibits either rotation or air  
flow. Remove all foreign materials before operating.  
3. Vent System: Inspect all vent connections annually for looseness, for evidence of corrosion and for flue gas leakage.  
Replace, seal, or tighten pipe connections if necessary. Check the power venter choke plate to insure it is secured in  
place. Check the barometric draft control, if installed, to insure the gate swings freely.  
4. System Safety Devices: With the heating system operating disconnect the pressure sensing tube from the pressure  
switch on the venter. This should stop the burner operation. Re-connecting the tube will relight the burner.  
Page 8  
 
PV SERIES POWER VENTER: VERTICAL VENTING OPTION  
Diagram D illustrates correct and incorrect installation of PV series venter in vertical vent configuration (except PVE-  
1200). The correct installation maintains the required vertical position of the pressure switch; the incorrect installation  
does not. The following conditions must also be observed:  
Natural gas, lp gas or #2 fuel oil appliance rated at 75% or greater non-condensing type of appliance.  
Maximum input temperature at power venter: 575°F  
Diagram D  
Page 9  
 
REPLACEMENT PARTS LIST  
The following items are available for replacement, if necessary.  
REPLACEMENT PARTS LIST  
DESCRIPTION  
Motor  
PVO-300 PVO-600  
46032000 46083300  
46033400 46089400  
Blower Wheel  
Post Purge Relay Timer 46144700 4614470  
Pressure Switch  
46311000 46311000  
VENTING SYSTEM OPERATIONAL INFORMATION  
Date:  
Oil Burner Nozzle Size  
Oil Burner Operating Pressure  
Pump Operating Vacuum Pressure  
Smoke Number  
Over-Fire Draft  
Equipment Outlet Flue Gas Temperature  
CO2 measurement  
INSTALLATION INFORMATION  
PVO-  
MODEL NO.:____________________________________________________________  
INSTALLER'S NAME:_____________________________________________________  
INSTALLER'S COMPANY:_________________________________________________  
INSTALLER'S PHONE NO.:________________________________________________  
DATE OF INSTALLATION:_________________________________________________  
Page 10  
 
NOTES  
Page 11  
 
P/N 46311800 Rev E 11/07  
 

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