Tjernlund PAI-2T User Manual

TJERNLUND PRODUCTS, INC.

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

TM

IN-FORCER

MODELS

PAI-1T & PAI-2T

REV. A 6/00

INSTALLATION INSTRUCTIONS

OWNER'S INSTRUCTIONS, DO NOT DESTROY

THIS DEVICE MUST BE INSTALLED BY A

QUALIFIED PERSON.

READ INSTRUCTIONS CAREFULLY PRIOR TO INSTALLATION

AND OPERATION OF THE AIR INTAKE SYSTEM.

Copyright © 2000, Tjernlund Products, Inc. All rights reserved. P/N 8504039

TABLE OF CONTENTS

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................................................................................................................4-5

Tools Required ...........................................................................................................................................................5

Cutting PVC Opening through Wall ............................................................................................................................5

IN-FORCER Installation ..............................................................................................................................................6

Installation of Pipe ..................................................................................................................................................6-7

Installation of Intake Elbow .....................................................................................................................................7-8

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.............................................................................................................................................................9

..................................................................................................................................................................10

...........................................................................................................................10-11

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.................................................................................................................................................12-13

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TM

is a trademark of Tjernlund Products, Inc. for IN-FORCER air intakes.

DESCRIPTION

-

SPECIFICATIONS

115/1/60, 1600 RPM, 80 watts, 1.0 FLA

Manual Override; Automatic adjustment, rated for 1 hp @ 125 VAC

GENERAL INFORMATION

INSTALLATION RESTRICTIONS

WARNING: Improper installation, adjustment, alterations, service or maintenance can cause injury or property damage. Refer to

this manual. For assistance or additional information consult a qualified installer, service agency or the equipment supplier.

CAUTIONS

Failure to install, maintain and/or operate the IN-FORCER in accordance with manufacturer’s instructions may result in conditions
that can produce bodily injury and property damage.
The IN-FORCER motor shaft must be mounted horizontally and with discharge facing down to prevent motor bearing wear and
ensure proper operation of the Fan Proving Switch.
The IN-FORCER must be installed level to ensure proper damper operation.
Disconnect power supply when making wire connections and servicing the IN-FORCER. Failure to do so may result in personal
injury and/or equipment damage.
Make certain the power source is adequate for the IN-FORCER requirements. Do not add the IN-FORCER to a circuit where the
total electrical load is unknown.

1

TIMER / CLOCK OPERATION

AUTOMATIC TIMER MODE

In order to operate the timer according to the desired automatic settings, the automatic/manual override switch has to be in the center
position. NOTE: If power is interrupted, the time setting will be off by how long power is interrupted for. It will be necessary to reset
to actual time if the IN-FORCER needs to operate at specific times of the day.

SETTING AUTOMATIC TIMER MODE

1. The white tabs are set for 15 minute increments for all A.M. and P.M. hours. Push tabs to the outer ring position at the desired time
intervals the IN-FORCER will be operated.

2. To reset clock to actual time, turn the outer clock dial gradually CLOCKWISE until the actual time is aligned with the triangle marker
on the inner dial. NOTE: A.M. and P.M. settings on dial.

MANUAL OVERRIDE

The IN-FORCER can be turned on so it operates continuously by switching the automatic/manual switch to "I".
The IN-FORCER may be completely turned off during seasons where adequate outside air is introduced to the house by switching the
automatic/manual switch to "O".

RECOMMENDED PATTERNS OF OPERATION

It is recommended that the Timer/Clock be programmed based on the lifestyle or needs of the occupants. For example, a family with
smokers may want to cycle the IN-FORCER more frequently than a family of non-smokers.

Another program may be to cycle the IN-FORCER during peak usage of exhaust fans, such as bathroom, kitchen, laundry or utility.
Outdoor air should be brought in at these peak times to help balance out pressure inside the house.

The IN-FORCER can be cycled on and off at regular intervals to periodically provide fresh air to the home.
The IN-FORCER may be operated continuously by moving the override switch to the "I" position. It can also be turned off during any

period in which adequate fresh air is supplied through windows by moving the override switch to the "O" position.

HYPOTHETICAL IN-FORCER OPERATION BASED ON LIFESTYLE

The example below shows a possible way in which cycling times of the IN-FORCER may be determined based on household occu­pant lifestyles, (See Diagram A).

6:00 A.M. to 9:00 A.M. = Outside fresh air should be brought into the house continuously to com­pensate for morning routines. Bathing, cooking, laundry and other activities such as smoking
necessitate that outside fresh air to be brought in. Depressurization of the house at these times is
common with many exhaust fans running at one time.

9:00 A.M. to 4:00 P.M. = House is normally vacant with parents at work and children at school.
Cycle IN-FORCER on and off for 15 minute intervals to assure fresh air is supplied to the house.

4:00 P.M. to 8:00 P.M. = Outside fresh air should be brought into the house continuously to com­pensate for evening routines. Bathing, cooking, laundry and other activities such as smoking
necessitate the need for outside fresh air to be brought in. Depressurization of the house at these
times is common with many exhaust fans running at one time.

DIAGRAM A

8:00 P.M. to 6:00 A.M. = All members of the household are usually present. Outside fresh air is
needed to dilute occupant generated carbon dioxide during sleeping. Cycle IN-FORCER on and
off for 15 minute intervals, with occasional 30 minute intervals to assure fresh air is supplied to house.

2

IN-FORCER OPERATION BASED ON AIR CHANGES PER HOUR

This method of operation can be used to supplement or provide for guaranteed air change rates. Table 1 shows the constant Cubic
Feet Per Minute (CFM) of air necessary to produce the desired Air Change Per Hour rate (ACH), assuming natural infiltration of out­side air at a rate of .10 ACH. Square footage is determined by calculating the finished living space of the house. Garages and crawl
space should not be included. The constant CFM figures shown assume that the living space has standard 8 foot ceilings.

1. Determine square footage of house living space on left hand column.

2. Pick desired air change rate from top row.

3. Locate intersection of these points to determine constant CFM that should be obtained to meet desired ACH.

TABLE 1

Where the CFM delivery of the IN-FORCER exceeds that listed in Table 1, the Timer/Clock can be set so the IN-FORCER is cycled to
obtain the desired ACH.

EXAMPLE

2000 square feet of living space

.2 ACH desired ventilation rate equals 27 CFM

IN-FORCER capacity of 53 CFM based on Table 2, page 4.

In this example the timer may be set so that the IN-FORCER operates for one half hour straight each hour or two fifteen minute peri­ods each hour.

IN-FORCER TERMINOLOGY

RECOMMENDED MOUNTING AND DISCHARGE TERMINATION LOCATIONS

The IN-FORCER may be mounted anywhere in the house. The best place to mount it is in an unfinished room where fan noise will
be isolated and exposed floor joists provide for easy installation. It may not be installed in a garage or area of the house where odor­ous or noxious fumes are present. The IN-FORCER tempers air from the room it is installed in and this may result in undesirable pol ­lutants being introduced into the home.

It is recommended that the IN-FORCER discharge in a location where there is not a lot of house traffic or in a manner that it will not
be directed at the occupants. Keep in mind that longer intake and discharge pipe runs reduce the CFM intake of the IN-FORCER,
(See Table 2 PAI-1T or Table 3 PAI-2T).

Do not terminate adjacent to thermostat. Although the incoming air is tempered with existing room air, severe outside temperatures
may be noticeable at the IN-FORCER discharge.

Do not terminate within three feet from a barometric draft control or intake grille of an appliance, (See Diagram K , Page 7).

3

INTAKE ELBOW TERMINATION CLEARANCES

The IN-FORCER has been Listed in accordance with the 1990 BOCA national Mechanical Codes M-306.1 and M-306.1.1 as follows,
(See Diagram B).

M-306.1 LOCATION: Outside air exhaust and intake openings shall be located a minimum of 10 feet (3048mm) from lot lines or build­ings on the same lot. When openings front on a street or public way, the distance shall be measured to the centerline of the street or
public way.

M-306.1.1 INTAKE OPENINGS: Outside air intake openings shall be located a minimum of 10 feet (3048mm) from any hazard or
noxious contaminant such as vents, chimneys, plumbing vents, streets, alleys, parking lots and loading docks. When a source conta­minant is located within 10 feet (3048mm) of an intake opening, such opening shall be located a minimum of 2 feet (610mm) below
the contaminant source.

IN ADDITION TO THESE CODES THE MANUFACTURER RECOMMENDS THAT:

• The intake elbow should be a minimum of 1 foot above grade or anticipated snow line.

DIAGRAM B

* IF TERMINATING BELOW GRADE

OR ANTICIPATED SNOW LINE,
USE EXTENSION PROCEDURE AS
SHOWN IN TABLE 2 OR TABLE 3.

If possible, terminate the IN-FORCER on a wall that does not face the direction of prevailing
winds. This will diminish the possibility of wind induced damper fluctuation noise.

DETERMINING CFM CAPABILITIES

Reference the chart of the correct model selecting either the PAI-1T or PAI-2T. The readings for CFM are determined with various
inlet and outlet pipe lengths. The charts are read the same way except the right hand chart takes into consideration an intake elbow
that is extended up to 4’ above exterior penetration for below grade applications or to extend above anticipated snow line. The top
row of the chart has inlet 3” diameter PVC pipe lengths from 2 to 20 feet. The left hand column has outlet 6” diameter pipe lengths
from 0 to 20 feet. Pipe lengths must be calculated in equivalent feet, (See Diagram H, Page 6). With correct model selected, deter ­mine pipe lengths and read intersection of inlet and outlet pipe lengths to determine CFM. Consult Tjernlund Products for information
on CFM data with pipe runs longer than those indicated on the charts.

TABLE 2

MODEL PAI-1T

4