Tjernlund V2D User Manual

DESCRIPTION

The Tjernlund UnderAire™ Series Crawl Space Ventilators are designed to circulate fresh outdoor air underneath homes
and porches. Excessive humidity levels in Crawl Spaces is the leading cause of premature rotting of support columns,
joists, floors and beam supports. Humidity can promote fungus growth and increased termite activity. Humidity may also
cause plumbing failures due to rust and corrosion. Constant operation helps vent radon gases, treated wood off-gassing
and other odors that might migrate into living areas. Deluxe models (V1D & V2D) are controlled by a dehumidistat which
actuates the fan if the relative humidity rises above the selected set-point.

IMPORTANT: All Ventilator models are equipped with a factory installed and pre-wired thermostat which will prevent opera­tion of the fan below 35°F outdoor temperature. Normal operation of the fan will resume once the temperature outside rises
near 50° F.

SPECIFICATIONS

GENERAL INFORMATION

Each UnderAire™ Crawl Space Ventilator is electrically factory line tested before shipment.

After opening carton, inspect thoroughly for shipment damage. Fan should rotate freely and all electrical wires and connec­tions should be secured. If any damage is found, notify freight carrier and your distributor immediately and file a concealed
damage claim.

RECOMMENDED VENTILATION RATE

Calculate the cubic area of the crawl space by multiplying the length x width x height. Divide this number by 15 to determine
the minimum CFM necessary to fully ventilate the space in 15 minutes. Example: 20’ wide x 40’ long x 3’ high crawl space =
2,400 cubic ft. 2400 cubic ft. divided by 15 minutes = 160 CFM of ventilation. Choose two V1 or V1D ventilators or one V2D
ventilator.

CRAWL SPACE VENTILATOR MODELS V1, V1D, V2D

©2013 TJERNLUND PRODUCTS, INC. ALL RIGHTS RESERVED P/N: 8504129 REV A

TJERNLUND PRODUCTS, INC.

1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE [phone] • [phone] • FAX [phone]
Visit our web site • www.tjernlund.com

READ OWNERS INSTRUCTIONS CAREFULLY PRIOR TO INSTALLATION.

THESE INSTRUCTIONS MUST REMAIN WITH EQUIPMENT. DO NOT DESTROY.

MODEL V1

MODEL V1D

MODEL V2D

MODEL V1 Ventilator:

Capacity: 110 CFM
Motor: 115 Volts ~ 50/60 Hz

0.30 amps maximum

Thermostat: On at 50°F

Off at 35°F
Dimensions: 14 3/8” x 6 7/8” x 2”
Mounting Plate Smallest

Trimmable Dimensions: 9 3/8” x 5 3/8”

MODEL V1D Ventilator:

Capacity: 110 CFM
Motor: 115 Volts ~ 50/60 Hz

0.30 amps maximum

Thermostat: On at 50°F

Off at 35°F
Dehumidistat: 20% - 80% RH Range
Dimensions: 18” x 9” x 2”
Mounting Plate Smallest

Trimmable Dimensions: 9 3/4” x 6”

MODEL V2D Ventilator:

Capacity: 220 CFM
Motors: 2 @ 115 Volts ~ 50/60 Hz

0.60 amps maximum

Thermostat: On at 50°F

Off at 35°F
Dehumidistat: 20% - 80% RH Range
Dimensions: 18” x 9” x 2”
Mounting Plate Smallest

Trimmable Dimensions: 14” x 6”

INSTALLATION

The Crawl Space Ventilator must be installed by a qualified installer in accordance with these instructions and all local
codes or in their absence in accordance with the latest editions of the International Residential Code and International
Electrical Code. Improper installation can create a hazardous condition such as fire, electric shock or personal injury.
To reduce these risks significantly, use this unit only in the manner intended by the manufacturer. If you have questions,
contact Tjernlund Products. Always disconnect the Crawl Space Ventilator from its power source before installation and servicing.

CAUTION: For general ventilation use only. Do not use to exhaust hazardous or explosive materials and vapors.

WARNING: To reduce the risk of fire or electric shock, do not use this fan with any solid-state speed control device.

TOOLS REQUIRED

• 5/16" Nut Runner or Flat Head Screw Driver

• Drill with 5/16" Masonry Bit if mounting on brick or foundation block

• Grounded Electrical Outlet within 6 feet of Ventilator location (Models V1D & V2D). Model V1 must be hard wired.

INSTALLATION

LOCATION

Mount Crawl Space Ventilator inside the crawl space behind existing foundation ventilation openings. Ventilation openings
shall be within three feet of each corner of the building.

NOTE: Crawl Space Ventilator must be mounted with the electrical control box and motor facing the interior of the crawl space.

1. Remove existing doors or covers on ventilation openings around the perimeter of the building.

2. Position the Crawl Space Ventilator over the ventilation opening.

3. If installing on foundation block or brick, mark location in the four corners of the metal face plate and drill 5/16" holes with
masonry bit. Install wall anchors into openings and secure Crawl Space Ventilator to the wall with four screws.

If installing on a wood header, rim joist or mesh on existing crawl space vent, secure Crawl Space Ventilator with screws,
washers and nuts in the four corners of the Ventilator metal face plate.

TYPICAL MODEL V1D & V2D MOUNTING

(Model V2D Shown)

TYPICAL MODEL V1 MOUNTING

WARNING

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