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MV5
User Manual
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LAARS MV5 User Manual

Installation and Operation Instructions Document 7008B
Installation and Operation Instructions for
Mighty Venter Power Vent System
Models MV2, MV3, MV4, and MV5 for Mighty Therm Sizes 500-1825
WARNING
If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a nearby phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency, or gas supplier.
H2015300B
Page 2
LAARS Heating Systems
TABLE OF CONTENTS
SECTION 1. General Information
1a. Sizing............................................................3
1b. Installer Cautions.......................................... 3
SECTION 2. Side Wall Vent Hood Location
2a. Side Wall Vent Hood Location...................... 4
SECTION 3. Installation
3a. Inspection and Unpacking ............................ 4
3b. Power Venter Mounting................................7
3c. Fan Proving Switch Installation ....................8
3d. Wiring ...........................................................8
Mighty Venter Power Vent Systems
Page 3
SECTION 1. General Information
WARNING
The MV2, MV3, MV4 or MV5 Mighty Venter must be installed in accordance with the procedures outlined in these instructions. Warranty applies only if the installation and operating instructions applicable to the model purchased are expressly and completely followed.
The Laars Mighty Venter Models MV2, MV3, MV4, MV5 are designed to side wall vent Laars’ Mighty Therm sizes 500 through 1825. All models are supplied with a fan proving switch which will disable the gas valve if the Mighty Venter fails to operate.
1a. Sizing
The Mighty Venter is sized for 500-1825 model sizes as shown in Table 1. The vent pipe length shown includes all vent pipe before and after the Mighty Venter. To calculate the equivalent vent pipe length, add the straight pipe plus 10 feet (3.0m) for every 90 degree elbow and 5 feet (1.5m) for every 45 degree elbow.
1b. Installer Cautions
1. Before beginning this installation, carefully read
these instructions and identify where each part is
placed in order to safely vent the flue gases to
the outdoors. This device must be installed and
maintained by a qualified professional installer in
accordance with these instructions. Failure to do
so may result in a hazardous condition such as an
explosion, carbon monoxide poison, bodily injury
and property damage. “Qualified Installer” shall
mean an individual properly trained and licensed.
2. Consult local building and safety codes before proceeding with work. The installation must conform to the requirements of the authority having jurisdiction or in the absence of such requirements, to the latest edition of the National Fuel Gas Code. ANSI Z223.1 or the CAN1-B149 installation Code (Canada), local plumbing and waste water codes, Chimneys, Fireplaces, Vents (NFPA #211), the National Electric Code (NFPA #70) (or the Canadian Electrical Code CSA C22.1) and the Occupational Safety and Health Act (OSHA).
3. Any modifications to the Power Venter, motor or wiring may void the warranty. If field conditions require such modifications, consult factory.
4. The Mighty Venter may be used with the following Laars hydronic boilers and volume water heaters.
On/Off or Two Stage Firing Mode Models: (HH, PH, VW, PW, IW, AP) (500 through 1825)
5. Carefully read the installation instructions located in the Side Wall Vent Hood carton.
6. The vent pipe necessary for this installation is not provided by Laars. Purchase class “C” type single wall vent pipe of diameter shown in the sizing table (see Table 1). Choose a vent pipe thickness (or gauge) that is in accordance with requirements of the local authority having jurisdiction.
7. The Mighty Venter must be as close to the point of termination (ie, wall) as possible. This will ensure that the vent pipe between the boiler and Mighty Venter is under negative pressure.
Mighty Venter
Model
MV2 500 20069301 10 (254) 8 (203) 100 (30.5) 6 (152) MV3
MV4
MV5
NOTES:
To be used for single boiler/heater installation only. To calculate the equivalent vent pipe length, add the straight pipe plus 10 feet for every 90° elbow and 5 feet for every 45° elbow. Vent pipe reducers will be supplied by Laars. Vent pipe is field supplied. In order to use 100' equivalent length of vent pipe with the size 1670 consult factory. A 14" vent pipe may be used.
Boiler/ Heater
Size
600 20069302 12 (305) 8 (203) 100 (30.5) 8 (203) 715 20069303 12 (305) 10 (254) 100 (30.5) 8 (203)
850 20069304 14 (356) 10 (254) 100 (30.5) 8 (203) 1010 20069305 16 (406) 12 (305) 100 (30.5) 8 (203) 1200 20069306 16 (406) 10 (254) 100 (30.5) 10 (254) 1430 20069307 18 (457) 10 (254) 100 (30.5) 10 (254) 1670 20069308 18 (457) 12 (305) 80 (24.4) 10 (254) 1825 20069309 18 (457) 14 (356) 100 (30.5) 10 (254)
Mighty Venter
Order Number
Boiler/Heater
Outlet Diameter
in. (mm)
Table 1. Sizing.
Vent Pipe
Diameter
in. (mm)
Maximum
Equivalent
Pipe Length
feet (m)
Mighty Venter
Diameter
in. (mm)
Page 4
LAARS Heating Systems
8. Vent pipe between the Mighty Venter and vent hood is acceptable. However, all vent pipe connections after the power venter will be under positive pressure during operation and must be sealed with high-temperature caulk or aluminum vent pipe tape to prevent leakage into the structure.
All accessible joints under positive pressure must be checked for tightness after installation. The vent connection under positive pressure shall be secured by at least two corrosion-resistant screws or other mechanical locking means. Also, the segment of the vent systems under positive pressure shall be checked once a year by a qualified service person.
9. The vent system must be adequately supported to prevent sagging, but in no case shall the supports be less than every 3 feet (0.9m).
10. The venting system must be sloped upward not less than 1/4" per foot from the boiler or water heater to the vent terminal. The vent system must be installed to prevent collection of condensate (should it occur).
11. Side Wall Vent Hood Location: a) The Vent Hood shall not terminate less than
6 feet (1.8m) from a combustion air inlet of another appliance.
b) The vent hood shall not terminate less than
3 feet (0.9m) from any other building opening or any service regulator.
c) The vent hood shall not terminate directly
above a gas utility meter or service regulator.(Also see the section entitled “Side Wall Vent Hood Location”)
12. Laars’ vent pipe reducers to be installed as shown in Figure 1.
13. Allow for a minimum of 18" (457mm) vertical rise off the top of the appliance before the vent makes a 90 degree elbow to the horizontal (see Figure 1).
14. Vent pipe shall not be run through an unheated space or interior part of an open chimney unless the vent pipe is insulated.
15. Plan the vent system so that code required clearances are maintained from plumbing and wiring.
16. The Mighty Venter must be mounted so that the shaft of the motor remains horizontal to prevent bearing wear and for proper Fan Proving Switch operation.
17. Ambient temperature surrounding Mighty Venter must not exceed 104°F (40°C).
18. To prevent personal injury and equipment damage, disconnect power supply to boiler or heater when working on Mighty Venter.
19. Make certain the power supply is adequate for Mighty Venter motor requirements. Do not add the Mighty Venter to a circuit where the total load is unknown.
20. IMPORTANT: The following clearances to combustible materials must be maintained for the Mighty Venter: sides: 6 inches (152mm); back: 8 inches (203mm).
SECTION 2. Side Wall Vent Hood Location
If possible, locate the side wall vent hood on a
wall least prone to high winds. This will diminish the possibility of appliance gas valve interruption during periods of winds in excess of 40 MPH (64kmh). The vent hood location must also be in compliance with the following:
1. Vent hood shall be a minimum of 7 feet (2.1m) above grade when located adjacent to a public walkway.
2. Vent hood shall be a minimum of 4 feet (1.2m) below, 4 feet (1.2m) horizontally from or 3 feet (0.9m) above any door, window or gravity air inlet into the building. Vent hood shall not terminate less than 3 feet (0.9m) from any other building opening or any gas service regulator.
3. Vent hood shall be installed no closer than 3 feet (0.9m) from an inside corner of an L-shaped structure.
4. Vent hood shall be installed at least 3 feet (0.9m) above any forced air inlet located within 10 feet (3m). Vent hood shall not terminate less than 6 feet (1.8m) from a combustion air inlet of another appliance.
5. Vent Hood shall not terminate directly above a gas utility meter or service regulator.
6. Do not install the vent hood closer than 2 feet (0.6m) from an adjacent building.
SECTION 3. Installation
3a. Inspection and Unpacking
Immediately after receiving your Mighty Venter
kit, inspect the shipment packaging and record any damage on the shipping documents. Unpack the equipment and carefully inspect for obvious damage due to shipment. If any damage has occurred, YOU must file a claim with the transporter, since they will not accept a claim from the shipper (Laars).
Cartons containing the following should be
included in the Mighty Venter Kit:
1. Mighty Venter (either MV2, MV3, MV4 or MV5).
2. Vent Hood
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