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 tha |