PSI 1450 Series Manual

Congratulations!
You have purchased the finest agricultural building heater available.
Your new PSI heater incorporates the benefits from the most experienced
manufacturer of heating products using state-of-the-art technology.
We, at PSI, thank you for your confidence in our products and
welcome any suggestions or comments you may have......call us, at
800-562-2966.
Owner's Manual and Instructions
Agricultural Animal Confinement Building Heaters
W6636 East Avenue North, Onalaska, WI USA ■[phone] ■[phone] ■Fax: [phone] ■[email protected]
F150-80776-A
IGNITION OUTPUT
SERIES TYPE (BTUH)
1450 Hot 40,000
Surface 60,000
Ignition 150,000
225,000
Available in
either L.P. Vapor
Withdrawal or
Natural Gas
Configurations.

ATTENTION ALL USERS
Agricultural CConfinement BBuilding HHeaters
Agricultural confinement building heaters are intended only
for installation in farm buildings used for the confinement of
poultry and livestock and which are not used as human
workplaces for periods in excess of 4 hours per day. This
type of heater is not intended for use in other types of
buildings including those used for human dwelling, grain
storage or grain handling or where gasoline or other liquids
having flammable vapors are stored or used.
This heater has been tested and evaluated by ITS/Warnock
Hersey in accordance with:
■A.G.A. Requirement 5-88 and is listed and approved
for U.S. installations as a direct-fired circulating heater
for agricultural confinement buildings.
■WP-GPN-003 and is listed and approved for Canadian
installations as an agricultural confinement building
heater.
■CAN 1-2.20 and is listed and approved for Canadian
installations as a gas-fired brooder.
Refer to the ventilation requirements for agricultural
confinement buildings in this manual.
Agricultural BBuilding HHeaters
Agricultural building heaters are intended only for
installation in farm buildings excluding those used for
human dwelling, grain storage or grain handling, or where
gasoline or other liquids having flammable vapors are
stored or used.
This heater has been tested and evaluated by ITS/Warnock
Hersey in accordance with GPN-003 and is listed and
approved for Canadian installations as an agricultural
building heater.
Refer to the ventilation requirements for agricultural
building heaters in this manual
If you are considering using this product for any application
other than its intended use, then please contact your fuel
gas supplier or PSI at 800-562-2966.

WARNING
Fire and Explosion Hazard
■Not for home or recreational vehicle use.
■Installation of this heater in a home or
recreational vehicle may result in a fire or
explosion.
■Fire or explosions can cause property
damage or loss of life.
FOR YOUR SAFETY
If you smell gas:
■Open windows.
■Don't touch electrical switches.
■Extinguish any open flame.
■Immediately call your gas supplier.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
WARNING
Fire and Explosion Hazard
■Keep solid combustibles a safe distance
away from the heater.
■Solid combustibles include wood or paper
products, feathers, straw, and dust.
■Do not use the heater in spaces which
contain or may contain volatile or airborne
combustibles.
■Volatile or airborne combustibles include
gasoline, solvents, paint thinner, dust
particles or unknown chemicals.
■Failure to follow these instructions may
result in a fire or explosion.
■Fire or explosions can lead to property
damage, personal injury or loss of life.
GENERAL HAZARD WARNING
■Failure to comply with the precautions and instructions provided with this heater, can result in:
— Death
— Serious bodily injury or burns
— Property damage or loss from fire or explosion
— Asphyxiation due to lack of adequate air supply or carbon monoxide poisoning
— Electrical shock
■Read this Owner’s Manual before installing or using this heater.
■Only properly-trained service people should repair or install this heater.
■Save this Owner’s Manual for future use and reference.
■Owner’s Manuals and replacement labels are available at no charge. For assistance, contact
PSI at 800-562-2966.
WARNING
■Proper gas supply pressure must be provided to the inlet of the heater.
■Refer to the heater’s dataplate for proper gas supply pressure.
■Gas pressure in excess of the maximum inlet pressure specified at the heater inlet can cause
fires or explosions.
■Fires or explosions can lead to serious injury, death, building damage or loss of livestock.
■Gas pressure below the minimum inlet pressure specified at the heater inlet may cause
improper combustion.
■Improper combustion can lead to asphyxiation or carbon monoxide poisoning and therefore
serious injury or death to humans and livestock.
2
CONSIGNES DE SECURITE
Si vous sentez une odeur de gaz:
■Ouvrez le fenetres.
■Ne touchez pas aux interrupteurs
electriques.
■Eteignez toute flamme nue.
■Contactez immediatement votre
compangie de gaz.
CONSIGNES DE SECURITE
Ill es interdit d'utiliser des liquides
inflammables ou degageant des vapeurs
inflammables, a proximite de tout appareil
fonctionnant au gaz.

Table of Contents
This Owner's Manual includes all options and accessories
commonly used on this heater. However, depending on the
configuration purchased, some options and accessories
may not be included.
When calling for technical service assistance, or for other
specific information, always have model number and serial
number available. This information is contained on the
dataplate. The dataplate is located on the exterior of the
case assembly on the blower outlet side of the heater.
This manual will instruct you in the operation and care of
your unit. Have your qualified installer review this manual
with you so that you fully understand the heater and how it
functions.
The gas supply line installation, installation of the heater,
and repair and servicing of the heater requires continuing
expert training and knowledge of gas heaters and should
not be attempted by anyone who is not so qualified. See
page 6 for definition of the necessary qualifications.
Contact your local PSI distributor or PSI for assistance, or if
you have any questions about the use of the equipment or
its application.
PSI has a policy of continuous product improvement. It
reserves the right to change specifications and design
without notice.
SECTION PAGE
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Heater Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Installation Instructions
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Air Diverter Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Hanging Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Sediment Trap Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Thermostat Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Manual Shut-Off Valve, Hose and Regulator Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Start-Up Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Shut-Down Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Variable Heat Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Cleaning Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Service Instructions
Motor and Fan Wheel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Air Proving Switch with Paddle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Igniter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Flame Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Gas Pressure Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Testing the Manual Reset High Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Electrical Connection and Ladder Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Mechanical Ventilation Interlock Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Heater Component Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Parts Identification
Parts Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Wire Selection Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Fastener Selection Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Warranty Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Replacement Parts and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
General Information
3

4
Heater Specifications
SPECIFICATIONS
40,000 60,000 150,000 225,000
22,000 32,000 30,000 90,000 96,000 150,000
1.85 40 2.77 60 6.94 150 10.42 225
lbs. cu. ft. lbs. cu. ft. lbs. cu. ft. lbs. cu. ft.
.92 20 1.48 32 4.16 90 6.94 150
lbs. cu. ft. lbs. cu. ft. lbs. cu. ft. lbs. cu. ft.
1/10 H.P. 1/4 H.P. 1/3 H.P.
1550 RPM 1100 RPM 1100 RPM
6.0 10.0 14.0
1.0 2.2 4.0
29 x 12 1/2 x 11 1/4 38 1/2 x 18 1/2 x 16 1/2 36 1/2 x 20 x 18 1/4
TOP 1 ft. (.3 m)
SIDES 1 ft. (.3 m)
BACK 1 ft. (.3 m)
BLOWER
OUTLET
GAS L.P. Gas Supply — 6 ft. (1.83 m)
SUPPLY Natural Gas Supply — N/A
Net Weight (lbs.) 48 95 105
Shipping Weight (lbs). 56 105 120
40 60 150 225
L.P. Natural L.P. Natural L.P. Natural L.P. Natural
Gas Gas Gas Gas Gas Gas Gas Gas
MMooddeell
Ventilation Air Required
to Support Combustion
Burner Manifold Pressure
Electrical Supply
(Volts/Hz/Phase)
Amp Draw
(Starting Amps
Includes Igniter)
Dimensions
L x W x H (in inches)
Minimum Safe
Distances From
Nearest
Combustible
Materials
STARTING
CONTINUOUS
OPERATION
Motor Characteristics
Fuel Consumption
Per Hour
Inlet Gas Supply
Pressure Acceptable
at the Inlet of the
Heater for Purpose
of Input Adjustment
MAX.
MIN.
MAX.
MIN.
Ball Bearing
10 ft. (3 m)
115/60/1
Maximum Input per Hour
Minimum Input per Hour
Fuel Type
200 CFM 250 CFM 625 CFM 900 CFM
13.5 in. W.C.
L.P. 11.0 in. W. C.
N.G. 7.0 in. W.C.
L.P. 10.0 in. W. C.
N.G. 4.0 in. W.C.

LP ggas aand nnatural ggas hhave mman-mmade oodorants aadded sspecifically ffor ddetection oofffuel ggas lleaks.
If aaggas lleak ooccurs, yyou sshould bbeaable ttossmell tthe ffuel ggas.
THAT’S YYOUR SSIGNAL TTOGGOIINTO IIMMEDIATE AACTION!
■Do not take any action that could ignite the fuel gas. Do
not operate any electrical switches. Do not pull any
power supply or extension cords. Do not light matches
or any other source of flame. Do not use your
telephone.
■Get everyone out of the building and away from the area
immediately.
■Close all propane (LP) gas tank or cylinder fuel supply
valves, or the main fuel supply valve located at the
meter if you use natural gas.
■Propane (LP) gas is heavier than air and may settle in
low areas. When you have reason to suspect a propane
leak, keep out of all low areas.
■Natural gas is lighter than air and can collect around
rafters or ceilings.
■Use your neighbor’s phone and call your fuel gas
supplier and your fire department. Do not re-enter the
building or area.
■Stay out of the building and away from the area until
declared safe by the firefighters and your fuel gas
supplier.
■FINALLY, let the fuel gas service person and the
firefighters check for escaped gas. Have them air out
the building and area before you return. Properly
trained service people must repair the leak, check for
further leakages, and then relight the appliance for you.
WARNING
■Do not use this heater for heating human living
quarters.
■Do not use in unventilated areas.
■The flow of combustion and ventilation air must not be
obstructed.
■Proper ventilation air must be provided to support the
combustion air requirements of the heater being used.
■Refer to the specification section of the heater’s
Owner’s Manual, heater dataplate, or contact the PSI to
determine combustion air ventilation requirements of
the heater.
■Lack of proper ventilation air will lead to improper
combustion.
■Improper combustion can lead to carbon monoxide
poisoning in humans leading to serious injury or death.
Symptoms of carbon monoxide poisoning can include
headaches, dizziness and difficulty in breathing.
■Symptoms of improper combustion affecting livestock
can be disease, lower feed conversion, or death.
Asphyxiation Hazard
■Some ppeople ccannot ssmell wwell. SSome ppeople ccannot
smell tthe oodor ooftthe mman-mmade cchemical aadded tto
propane ((LP) oornnatural ggas. YYou mmust ddetermine iifyyou
can ssmell tthe oodorant iintthese ffuel ggases.
■Learn to recognize the odor of propane (LP) gas and
natural gas. Local propane (LP) gas dealers and your
local natural gas supplier (utility) will be more than
happy to give you a scratch and sniff pamphlet. Use it
to become familiar with the fuel gas odor.
■Smoking can decrease your ability to smell. Being
around an odor for a period of time can affect your
sensitivity to that particular odor. Odors present in
animal confinement buildings can mask fuel gas odor.
■The oodorant iinppropane ((LP) ggas aand nnatural ggas iis
colorless aand tthe iintensity oofiits oodor ccan ffade uunder
some ccircumstances.
■If there is an underground leak, the movement of gas
through the soil can filter the odorant.
■Propane (LP) gas odor may differ in intensity at different
levels. Since propane (LP) gas is heavier than air, there
may be more odor at lower levels.
■Always bbessensitive ttotthe sslightest ggas oodor. If you
continue to detect any gas odor, no matter how small,
treat it as a serious leak. Immediately go into action as
discussed previously.
5
Safety Precautions
FUEL GAS ODOR
ODOR FADING -- NO ODOR DETECTED
ATTENTION -- CRITICAL POINTS TO REMEMBER!
■Propane (LP) gas and natural gas have a distinctive
odor. Learn to recognize these odors. (Reference Fuel
Gas Odor and Odor Fading sections above.
■ If you have not been properly trained in repair and service
of propane (LP) gas and natural gas fueled heaters, then
do not attempt to light heater, perform service or repairs,
or make any adjustments to the heater on propane (LP)
gas or natural gas fuel system.
■Even if you are not properly trained in the service and
repair of the heater, ALWAYS be consciously aware of
the odors of propane (LP) gas and natural gas.
■A periodic sniff test around the heater or at the heater’s
joints; i.e. hose, connections, etc., is a good safety
practice under any conditions. If you smell even a small
amount of gas, CONTACT YOUR FUEL GAS SUPPLIER
IMMEDIATELY. DO NOT WAIT!

1. Do not attempt to install, repair, or service this heater
or the gas supply line unless you have continuing
expert training and knowledge of gas heaters.
Qualifications for service and installation of this
equipment are as follows:
a.
To be a qualified gas heater service person, you
must have sufficient training and experience to
handle all aspects of gas-fired heater installation,
service and repair. This includes the task of
installation, troubleshooting, replacement of
defective parts and testing of the heater. You
must be able to place the heater into a continuing
safe and normal operating condition. You must
completely familiarize yourself with each model
heater by reading and complying with the safety
instructions, labels, Owner’s Manual, etc., that is
provided with each heater.
b. To be a qualified gas installation person, you must
have sufficient training and experience to handle
all aspects of installing, repairing and altering gas
lines, including selecting and installing the proper
equipment, and selecting proper pipe and tank
size to be used. This must be done in accordance
with all local, state and national codes as well as
the manufacturer’s requirements.
2. All installations and applications of PSI heaters must
meet all relevant local, state and national codes.
Included are L.P. gas, natural gas, electrical, and
safety codes. Your local fuel gas supplier, a local
licensed electrician, the local fire department or
similar government agencies, or your insurance agent
can help you determine code requirements.
a. For U.S.A. installations and applications:
-- ANSI/NFPA 58, latest edition, Standard for
Storage and Handling of Liquefied Petroleum
Gas and/or
-- ANSI Z223.1/NFPA 54, National Fuel Gas Code
-- ANSI/NFPA 70, National Electrical Code.
b. For Canadian Installations and Applications:
-- CAN1-B149.1 or CAN1-B149.2 Installation Codes
-- CSA C22.1 Part 1 Standard Canadian Electrical
Code. CSA C22.2 No. 3, Electrical Features of
Fuel-Burning Equipment.
3. Do not move, handle, or service heater while in
operation or connected to a power or fuel supply.
4. This heater may be installed in areas subject to
washdown. This heater may only be washed on the
external case assembly—see Cleaning Instructions.
Do not wash the interior of the heater. Use only
compressed air, soft brush or dry cloth to clean the
interior of the heater and it’s components. After
external washdown, do not operate the heater until it
is completely dry. In any event, do not operate this
heater for at least one hour after external washdown.
5. For safety, this heater is equipped with manual reset
high-limit switches and an air flow switch. Never
operate this heater with any safety device that has
been bypassed. Do not operate this heater unless all
of these features are fully functioning.
6. Do not operate the heater with its door open or panel
removed.
7. Do not locate fuel gas containers or fuel supply hoses
anywhere near the blower outlet of the heater.
8. Do not block air intakes or discharge outlets of the
appliance. Doing so may cause improper combustion
or damage to heater components leading to property
damage or animal loss.
9. The hose assembly (if provided) shall be visually
inspected on an annual basis. If it is evident there is
excessive abrasion or wear, or if the hose is cut, it
must be replaced prior to the heater being put into
operation. The hose assembly shall be protected
from animals, building materials, and contact with
hot surfaces during use. The hose assembly shall be
that specified by the manufacturer. See parts list.
10. Check for gas leaks and proper function upon heater
installation, before building repopulation or when
relocating.
11. This heater should be inspected for proper operation
by a qualified service person before building
repopulation and at least annually.
12. Always turn off the gas supply to the heater if the
heater is not going to be used in the heating of
livestock.
13. This appliance is equipped with a three-prong
(grounding) plug for your protection against shock
hazard and must be plugged directly into a properly
grounded three-prong receptacle. Failure to use a
properly grounded receptacle can result in electrical
shock, personal injury, or death.
14. Hot surface ignition heaters will make up to three
trials for ignition. If ignition is not achieved after the
third trial, the control system will “lock out” the gas
control valve. If gas is smelled after system lock out
has occurred, immediately close all fuel supply
valves. Do not relight until you are sure that all as
that may have accumulated has cleared away. In any
event, do not relight the heater for at least 5 minutes.
15. In a hanging type installation, rigid pipe or copper
tubing coupled directly to the heater may cause gas
leaks during movement, and therefore must not be
used. Use only gas hose assemblies that are rated
and approved for LP-gas and natural gas in a hanging
type installation.
16. Installations not using the gas hose supplied with this
appliance must connect dimensionally using
American National Standard Wrought Steel and
Wrought Iron Pipe B36/10-1970. (Aluminum piping
or tubing shall not be used.) Copper tubing when
used for conveying natural gas, shall be internally
tinned or equivalently treated to resist sulphur.
6
Safety Precautions

1. Read all safety precautions and follow PSI
recommendations when installing this heater. If
during the installation or relocating of heater, you
suspect that a part is damaged or defective, call a
qualified service agency for repair or replacement.
2.
Make sure the heater is properly positioned before use
and is hung level. Observe and obey all minimum safe
distances of the heater to the nearest combustible
materials. Minimum safe distances are given on the
heater nameplate and on page 4 of this manual.
3. This heater is approved for indoor use only.
4. The heater must have the proper gas regulator
installed for the application. A regulator must be
connected to the gas supply so that gas pressure at
the inlet to the gas valve is regulated within the range
specified on the dataplate at all times. Contact your
gas supplier, or PSI if you have any questions.
5. The heater’s gas regulator (with pressure relief valve)
should be installed outside of building. Any
regulators inside the buildings must be properly
vented to the outside. Local, state and national
codes always apply to regulator installation. Natural
gas regulators with vent limiting device may be
mounted indoors without venting to outdoors.
6. All gas pressure regulators must be installed in strict
accordance with the manufacturer’s safety
instructions. These instructions accompany each
regulator.
7. Insure that all accessories that ship within the heater
have been removed from inside of heater and
installed. This pertains to air diverters, hose,
regulator, etc.
8. Make certain that a sediment trap is installed at the
gas valve inlet to prevent foreign materials (pipe
compound, pipe chips and scale) from entering the
gas valve. Debris blown into the gas valve may cause
that valve to malfunction resulting in a serious gas
leak that could result in a possible fire or explosion
causing loss of products, building or even life. A
properly installed sediment trap will keep foreign
materials from entering the gas valve and protect the
safe functioning of that important safety component.
9. Any heater connected to a piping system must have
an accessible, approved manual shut off valve
installed within 6 ft. of the heater it serves.
10. Check all connections for gas leaks using approved
gas leak detectors. Gas leak testing is performed as
follows: Check all pipe connections, hose
connections, fittings and adapters upstream of the
gas control with approved gas leak detectors. In the
event a gas leak is detected, check the components
involved for cleanliness and proper application of
pipe compound before further tightening. Further
tighten the gas connections as necessary to stop the
leak. After all connections are checked and any leaks
are stopped, turn on the main burner. Stand clear
while the main burner ignites to prevent injury caused
from hidden leaks that could cause flashback. With
the main burner in operation, check all connections,
hose connections, fittings and joints as well as the
gas control valve inlet and outlet connections with
approved gas leak detectors. If a leak is detected,
check the components involved for cleanliness in the
thread areas and proper application of pipe
compound before further tightening. Further tighten
the gas connection as necessary to stop the leak. If
necessary, replace the parts or components involved
if the leak cannot be stopped. Ensure all gas leaks
have been identified and repaired before proceeding.
11. A qualified service agency must check for proper
operating gas pressure upon installation of the
heater.
12. Light according to instructions on the heater or within
owner’s manual.
13. It is extremely important to use the proper size and
type of gas supply line to assure proper functioning of
the heater. Contact your fuel gas supplier for proper
line sizing and installation.
14. This heater can be configured for use with either L.P.
vapor withdrawal or natural gas. Consult the
dataplate, located on the blower outlet side of the
WARNING
Fire oorEExplosion HHazard.
Can ccause pproperty ddamage, ssevere iinjury oorddeath.
■Disconnect power supply before wiring to prevent
electrical shock or equipment damage.
■To avoid dangerous accumulation of fuel gas, turn off
gas supply at the appliance service valve before
starting installation, and perform gas leak test after
completion of installation.
■Do not force the gas control knob. Use only your
hand to turn the gas control knob. Never use any
tools. If the knob will not operate by hand, the
control should be replaced by a qualified service
technician. Force or attempted repair may result in
fire or explosion.
7
Installation Instructions
GENERAL
WARNING
Fire aand EExplosion HHazard
■Do not use open flame (matches, torches, candles,
etc.) in checking for gas leaks.
■Use only approved leak detectors.
■Failure to follow this warning can lead to fires or
explosions.
■Fires or explosions can lead to property damage,
personal injury or loss of life.

case assembly, for the gas configuration of the
specific heater. Do not use the heater in an L.P. gas
liquid withdrawal system or application. If you are in
doubt, contact PSI.
15. Eventually, like all electrical/mechanical devices, the
thermostat can fail. Thermostat failure may result in
either an underheating or overheating condition
which may damage critical products and/or cause
animal injury or death. Critical products and/or
animals should be protected by a separate back-up
control system that limits high and low temperatures
and also activates appropriate alarms.
16. Take time to understand how to operate and main-
tain the heater by using this Owner’s Manual. Make
sure you know how to shut off the gas supply to the
building and also to the individual heater. Contact
your fuel gas supplier if you have any questions.
17. Any defects found in performing any of the service or
maintenance procedures must be eliminated and
defective parts replaced immediately. The heater
must be retested by properly qualified service
personnel before placing the heater back into use.
18. Do not exceed input rating stamped on the dataplate
of the heater. Do not exceed the burner manifold
pressure stated on the dataplate. Do not use an
orifice size different than specified for the specific
input rating of this heater, fuel type configuration and
altitude.
8
1. Ventilation must be provided as indicated in the
Heater Specification table of this manual or on the
data plate of the heater.
2. Ventilation Requirements:
a. Canadian Installations, Agricultural Confinement
Building Heater, Gas-Fired Brooder.
-- A ventilation system shall be provided in
accordance with national, provincial, local
codes of CAN/CGA-B149 if local code
requirements do not exist.
-- CAN/CGA-B149 requires the building have
ventilation of not less than 3 cfm per 1,000
BTUH input of the heater. Ventilation must be
provided as indicated in the Heater
Specification table of this manual or on the
data plate of the heater.
b. Canadian Installations, Agricultural Building
Heater.
-- A ventilation system shall be provided in
accordance with national, provincial, local
codes or CAN/CGA-B149 if local code
requirements do not exist.
-- Installation requires the building have
ventilation of not less than 3 cfm per 1,000
BTUH input of the heater. Ventilation must be
provided as indicated in the Heater
Specification table of this manual or on the
data plate of the heater.
-- Mechanical ventilation shall be interlocked with
the heater to prevent heater operation unless
the ventilation air flow is proven by an air flow
proving device.
-- Air for combustion shall be supplied from
outdoors. The size of the opening shall be in
accordance with Table 5.2.2A of CAN/CGA-
B149.
-- The opening (or duct termination if ducted)
shall be within 1 foot (300 mm) above, and
within 2 feet (600 mm) horizontally from the
burner level of the heater.
-- An opening to the outdoors shall be located in
accordance with local code requirements, or
CAN/CGA-B149 if local code requirements do
not exist.
VENTILATION
AIR DIVERTER
INSTALLATION INSTRUCTIONS
(Optional accessory.)
(Appearance of the outlet on heater may vary from model to model.)
(Continued oonPPage 99)
1. Optional air diverters can be installed in the heater
outlet to provide two 45 degree paths to the heated
air as it exits the heater. Installation options include
installing the diverters in such a way as to broadly
distribute the air in two 45 degree paths or to focus
the air flow in one 45 degree direction.
a. 40,000, 660,000, aand 2225,000 BBTUH HHeaters
Mount the air diverter to the outlet duct of the
heater by lining up the screw holes in the diverter
with the holes in the duct. Secure in place with
the screws included with the air diverter.
b. 150,000 BBTUH HHeaters
Insert the tabs of air diverters between sheet
metal case front and blower outlet. Loosen the
blower outlet screws if necessary.

1. Assemble according to the illustration below and
tighten all eyebolts securely.
FIG. 2
2. Be sure heater is securely fastened and is hanging
level. (Check crosswise and lengthwise.)
4. See Fig. 3 for typical indoor installation. In any
animal confinement building, consideration must be
given to making sure the heater is located away from
the livestock so that livestock cannot knock the
heater, tear it loose from its mounting, or damage the
heater or its gas supply line in any way. Make sure
you observe and obey minimum clearance distances
to combustible materials as stated in the
specification section of this owner’s manual and on
the heater dataplate.
FIG. 3
9
HANGING INSTRUCTIONS
a. 40,000, 660,000, aand 2225,000 BBTUH HHeaters b. 150,000 BBTUH HHeaters
FIG. 1
SHEET METAL SCREW
4 REQUIRED
DIVERTER
DUCT
2 PIECE AIR DIVERTER INSTALLATION
1450 - 225 HEATERS
DIVERTER
OUTLET SCREWS
2 PIECE AIR DIVERTER INSTALLATION
1450 - 150 HEATER
INSTALLATION: SLIDE TABS BETWEEN SHEET METAL CASE
FRONT AND BLOWER HOUSING. LOOSEN 4
BLOWER OUTLET SCREWS IF NECESSARY.
Alternate Air Diverter Installations
(Continued ffrom PPage 88)
NOTE: REGULATORS SHOULD ALWAYS BE MOUNTED OUTDOORS. IF
CIRCUMSTANCES FORCE INSTALLING THE REGULATOR INDOORS,
THE REGULATOR'S VENT MUST BE VENTED OUTDOORS USING VENT
LINE NO SMALLER THAN VENT OPENING.
VENT OF REGULATOR MUST
POINT DOWN AND REGULATOR
MUST BE VENTED OUTDOORS
MANUAL SHUT-OFF VALVE
CAN BE INSTALLED BEFORE
THE REGULATOR, UNDER
THE EAVE OF THE BUILDING,
OR AFTER THE REGULATOR
INSIDE THE BUILDING.
OPTIONAL INDOOR
REGULATOR
MOUNTING LOCATION
GAS HOSE
THERMOSTAT
CORD
YOKE
HEATER
THERMOSTAT 1 FT.
BLACK PIPE
THROUGH WALL
VENT LINE
WALL OUTLET
POWER CORD
SEDIMENT
TRAP
WALL
CHAIN OR CABLE
1 FT.
DIVERTER
DIVERTER
DUCT
OUTLET
SCREWS
SHEET METAL
SCREW
EYEBOLT
NUT
FLAT WASHER
CAGE NUT
CHAIN
CASE TOP

10
MANUAL SHUT-OFF VALVE, HOSE
AND REGULATOR ASSEMBLY
1. To CConnect tthe SSeries TTap PPlug TThermostat KKit:
a. Connect the power cord of the heater to the
female side of the plug on the end of the
thermostat cord.
b. Plug the male side of the series tap plug on the
thermostat cord into a three-wire (grounded)
electrical outlet within the building.
2. To CConnect tthe DDirect WWired TThermostat KKit ttotthe
Control BBox oontthe HHeater:
a. The installation and wiring of a thermostat must
be done by an electrician or someone properly
qualified.
b. The thermostat may use 18 gauge, 3 wire (with
ground) cord to handle the voltage being supplied
to the thermostat.
c. The heater must be tested for proper operation
after the thermostat has been connected.
WARNING
Electrical SShock HHazard
■Disconnect the electrical supply before connecting the
thermostat to the heater.
■Failure to follow this warning can result in electrical
shock, leading to personal injury or death.
THERMOSTAT INSTALLATION
SEDIMENT TRAP ASSEMBLY
NIPPLE
HOSE ADAPTER
TEE
NIPPLE
CAP
TO GAS CONTROL
VALVE INLET
Assemble the tee, nipples and cap together and tighten
securely. The sediment trap assembly must always be
mounted in a vertical position. Make sure pipe thread
compound that is resistant to both L.P. and natural gas is
used in making all connections. Check aall cconnections ffor
gas lleaks uusing aapproved ggas lleak ddetectors.
FIG. 4
REGULATOR
NIPPLE
VALVE, MANUAL
SHUT-OFF
GAS HOSE
ADAPTER
SEDIMENT TRAP
TO CONTROL
VALVE INLET
REGULATOR VENT
GAS FLOW
1. Always use approved pipe thread compound suitable
for use with L.P. or natural gas on the threaded
connections.
2. Assemble the components together according to the
figure. This view is to show general assembly of the
components only.
3. Tighten all connections securely.
4. Check aall cconnections ffor ggas lleaks uusing aapproved
gas lleak ddetectors.
FIG. 5

Follow steps 1 - 6 on initial start-up after heater installation
by a qualified gas heater service person. For normal start-
up, simply set the thermostat above room temperature. The
heater will start.
1. Open all manual fuel supply valves and check for gas
leaks using approved leak detectors. The gas control
valve on the heater has a manual shut-off feature
incorporated into the valve assembly and will be
located within the gas control and electrical
enclosure. Open the enclosure and make sure the
indicator on the valve is turned to the “on” position.
Close and latch the enclosure. See Fig. 6.
FIG. 6
2. Connect the electrical cord to an approved electrical
outlet.
3. Set the thermostat (if supplied) to desired room
temperature.
4. This heater includes a hot surface ignition (HSI)
control module for purposes of controlling the timing
of the ignition process of the heater as well as
monitoring of the safety functions. The HSI module is
contained within the gas control and electrical
enclosure. On the HSI module is a red light emitting
diode (LED). This LED indicates the status of the
heater. The LED is visible external of the control
enclosure through the plastic eye. A constant light
from the LED is an indicator that the heater is
functioning correctly. Any flash pattern by the LED is
indicative that there is a problem in the operation of
the heater. Refer to the troubleshooting decal on the
access panel at the fan motor end of the heater for
assistance in troubleshooting. Only qualified and
properly trained personnel shall service or repair the
heater.
5. On a call for heat, the motor will start up and run for
five (5) seconds and then stop. This “pre-purge” is a
safety feature and a normal operational
characteristic prior to ignition taking place. After the
motor has stopped, the igniter will heat up
(approximately 17 seconds). After igniter warm up
time has been achieved, the motor will start again
and shortly thereafter ignition will occur.
NOTE: It is normal for air to be trapped in the gas
hose on new installations. The heater may
attempt more than one trial for ignition
before the air is finally purged from the line
and ignition takes place.
6. The HSI control will make up to three trials for
ignition. Each trial for ignition will take approximately
20 seconds. The first two trials for ignition will occur
within 40 seconds if ignition is not achieved. A 15
minute “wait period” will then begin after the second
trial for ignition has taken place. After the 15 minute
time span has elapsed, the third and final trial for
ignition will take place. If ignition is not achieved at
this final trial, the system will “lock out”, and a “three
flash” pattern will be indicated by the LED.
11
If the heater is to be shut down for cleaning, maintenance or
repair, follow steps 1 - 5. Otherwise, simply turn thermostat
to off or no heat for standard shut down.
1. Close all manual fuel supply valves.
2. With the heater lit, allow heater to burn off excess
fuel in gas supply hose.
3. Turn the indicator on the gas control to off.
4. Turn thermostat to off or no heat position.
5. Disconnect the heater from the electrical supply.
Start-Up Instructions
Shut-Down Instructions
ON
OFF

1. All models of propane (LP) gas or natural gas heaters
have a throttle valve for varying heat output located
between the gas control valve and gas manifold
assemblies. THIS IS NOT A MANUAL GAS SHUT OFF
VALVE.
2. The throttle valve can be adjusted to deliver either
minimum heat or maximum heat. When the throttle
valve handle is parallel to the gas flow, the valve is
completely open to deliver maximum heat output.
(Refer to Fig. 7.)
The throttle valve may be adjusted to minimum heat
output by turning the handle 90° to gas flow or any
position between maximum and minimum settings.
(Refer to Fig. 8.).
Variable Heat Output
FIG. 7 FIG. 8
12
THROTTLE
VALV E
GAS MANIFOLD
MAXIMUM HEAT
MINIMUM HEAT
75% OF MAXIMUM
90% OF MAXIMUM

13
1. Have your gas supplier check all gas piping annually
for leaks or restrictions in gas lines. Also, at this time
have your gas supplier clean out the sediment trap of
any debris that may have accumulated.
2. The aappliance aarea sshall bbekkept cclear aand ffree ffrom
combustible mmaterials, ggasoline, aand oother
flammable vvapors aand lliquids.
3. Regulators can wear out and function improperly.
Have your gas supplier check the date codes on all
regulators installed and check delivery pressures to
the appliance to make sure that the regulator is
reliable.
4. Regulators must be periodically inspected to make
sure the regulator vents are not blocked. Debris,
insects, insect nests, snow, or ice on a regulator can
block vents and cause excess pressure at the
appliance.
1. Before cleaning, shut off all gas supply valves and
disconnect the electrical supply.
2. The heater should have dirt or dust removed
periodically:
a. After each flock or between building re-
population, give the heater a general cleaning
using compressed air or a soft brush on its
interior and exterior. At this time, dust off the
motor case to prevent
the motor from over-heating
and shutting the heater down.
b. At least once a year, give the heater a thorough
cleaning. At this time, remove the fan and motor
assembly and brush or blow off the fan wheel,
giving attention to the individual fan blades.
Make sure the burner air inlet venturi ports and
the “throat” of the casting are free of dust
accumulation and the area between the heat
chamber top and inside case is also free of dust.
Additionally, the flame sensor should be removed
and cleaned according to the service instructions
within this Owner’s Manual.
c. When washing with water, observe and obey the
Warning within these Cleaning Instructions. This
same Warning is also supplied on the heater.
WARNING
This heater may be washed only on the external case
assembly provided:
A. The heater is disconnected from the electrical
supply.
B. All access panels are securely closed.
C. Water spray nozzle shall not discharge within 6 ft. of
the heater.
D. The water pressure does not exceed 45 PSIG for 10
seconds on each side of heater.
E. The heater is not reconnected to electrical supply for
a minimum of 1 hour or until the heater is
thoroughly dry.
Improper cleaning of the heater can cause severe
personal injury or property damage due to water and/or
cleaning solution:
1. In electrical components, connections and wires
causing electrical shock or component failure.
2. On gas control components causing corrosion which
can result in gas leaks and fire or explosion from the
leak.
Clean internal components of the heater with a soft, dry
brush or cloth, or compressed air.
Cleaning Instructions
Maintenance Instructions
WARNING
Fire, BBurn, aand EExplosion HHazard
■This heater contains electrical and mechanical components in the gas management, safety and airflow systems.
■Such components may become inoperative or fail due to dust, dirt, wear, aging, or the corrosive atmosphere of an
animal confinement building.
■Periodic cleaning and inspection as well as proper maintenance are essential to avoid serious injury or property
damage.

AIR PROVING SWITCH WITH PADDLE
Service Instructions
MOTOR AND FAN WHEEL ASSEMBLY
1. Shut off the gas supply to the heater.
2. Disconnect the heater from its electrical supply.
3. Open the case access panel on the control box end of
the heater.
4. Remove the two (2) sheet metal screws holding the
switch with bracket to blower housing. Remove the
assembly by turning the switch assembly 90° so the
paddle on the switch arm can be pulled through the
oblong hole on side of fan housing.
5. Disconnect the leads from the air proving switch.
6. To replace the switch, reverse the above procedure.
The replacement switch will be pre-assembled to its
mounting bracket.
IMPORTANT
Make sure you don’t bend the switch arm when installing
the replacement switch. Bending the switch arm may
create ignition problems later.
FIG. 10
14
SWITCH W/PADDLE
LEADS
OBLONG HOLE
NUTS PADDLE
HOUSING SIDE PANEL
MOTOR MOUNT PLATE FAN WHEEL
CLEARANCE
MOTOR
1. Shut off the gas supply to the heater.
2. Disconnect the heater from its electrical supply.
3. Open the case fan access panel on the motor end of
the heater.
4. Disconnect the motor leads.
5. Remove the screws securing the motor mounting
plate to the fan housing.
6. Pull the fan and motor assembly from the housing.
7. Loosen the square head set screw(s) on the fan
wheel with a wrench.
8. Pull the fan wheel from the motor shaft. Use a wheel
puller if necessary.
9. Remove the four (4) nuts securing the motor to the
mounting plate.
10. To replace the motor and fan, reverse the above
procedures.
NOTES: a. Fan wheel to motor mount plate spacing
must be adjusted to proper clearance
before tightening the fan wheel to the
motor shaft.
b. Make sure that set screw(s) of the fan are
on the “flats” of motor shaft when
tightening.
Heat OOutput ((BTUH) Clearance
40,000/60,000/150,000 3/8 in.
225,000 1/8 in.
FIG. 9

1. Shut off the gas supply to the heater.
2. Disconnect the heater from its electrical supply.
3. Open the burner end access panel.
4. Disconnect the igniter.
5. Loosen the screw that secures the igniter shield and
igniter to the mounting bracket.
6. Position the replacement igniter to the igniter bracket
so the lip on back side of the igniter is resting on the
edge of the mounting bracket and so the mounting
hole in the igniter straddles the mounting screw.
7. Replace the igniter shield.
8. Tighten the mounting screw snugly. DO NOT
OVERTIGHTEN. Overtightening can cause cracks in
base of igniter, possibly leading to future igniter
failure.
9. Connect the igniter to the igniter power supply leads.
10. Close and secure the burner access panel.
IMPORTANT
■Do not handle the igniter by the igniter element. Doing
so may cause premature igniter failure. Handle the
igniter by its ceramic base, or by its leads.
■Center the igniter shield over the igniter element,
making sure the shield does not touch the igniter
element, otherwise igniter damage will occur when the
igniter is energized..
■Do not overtighten the igniter mounting screw.
Overtightening will crack the base of the igniter, leading
to premature failure.
IGNITER
See FFig. 111
15
FLAME SENSOR
Complete tthis pprocedure aatlleast oonce dduring tthe hheating sseason.
BURNER
FLAME
BURNER
CASTING
FLAME SENSOR
3/8 TO 1/2 IN.
IGNITER
SHIELD, IGNITER
SCREW
WASHER, LOCK
MALE CONNECTOR FEMALE CONNECTOR
SCREW
BRACKET, IGNITER
BURNER, CASTING
SENSOR, FLAME
1/2 TO 3/4 IN.
1. To help maintain proper flame sense, the sensor
should be removed from its mounting bracket and its
metal rod cleaned using steel wool or emery cloth.
Rub briskly to remove build up of dust, dirt and
aluminum oxide. Be careful not to fracture the
ceramic base of the sensor.
FIG. 11
2. Check the flame sensor’s ceramic base for any
cracks. If cracks are found, replace the sensor.
IMPORTANT
■For proper flame sense operation, the flame sensor tip
must be properly positioned within the burner flame.
Normally 1/2 in. to 3/4 in. is sufficient.
FIG. 12

GAS PRESSURE CHECKS
16
WARNING
Fire aand EExplosion HHazard
■Do not disassemble the gas control valve.
■Do not attempt to replace any components on the gas
control valve.
■The gas control valve must be replaced if any physical
damage occurs to the control valve assembly.
■Failure to follow this warning will result in fire or
explosions, leading to injury or death to humans and
livestock, and building damage.
OUTLET PRESSURE
TAP SCREW
INLET PRESSURE
TAP SCREW
INLET PRESSURE TAP
LOW PRESSURE GAUGE
LOW PRESSURE GAUGE
INTERNAL PRESSURE
REGULATOR OUTLET PRESSURE TAP
ON
OFF
O
5
10
15
20
25
30
35
O
5
10
15
20
25
30
35
OUTLET PRESSURE TAP
INLET PRESSURE TAP
ATTENTION
■The following explains a typical procedure to be followed
in checking gas pressures.
■The gas pressures will vary depending upon model
number and fuel type.
■Consult the dataplate on the heater or page 4 in this
manual for specific pressures to be used in conjunction
with this procedure.
■Gas pressure measured at the inlet to the gas valve is
Inlet Pressure and gas pressure measured at the outlet
of the gas valve is burner Manifold Pressure.
A. Preparation
1. Obtain two pressure gauges capable of reading up to
35 in. W.C.
2. Disconnect the heater from the electrical supply and
close the fuel supply valve to the heater inlet.
3. Open the control box.
4. Brush or blow off any dust and dirt on or in the
vicinity of the gas control valve.
B. Gauge IInstallation
1. Remove the inlet and outlet pressure tap plugs. See
Fig. 13.
2. Securely connect a pressure gauge to each pressure
tap port.
3. Open the fuel supply valves to the heater and
reconnect the heater electrical supply.
4. Start the heater.
C. Reading PPressures
1. With the heater operating, the pressure gauges
should read the pressures specified on the dataplate.
2. Do the readings at the inlet and outlet pressure
gauges agree with that specified on the dataplate? If
so, then no further checking or adjustment is
required. Proceed to Section D.
3. If the inlet pressures do not agree with that specified
on the dataplate, then the building system regulator
controlling gas pressure to the heaters requires
adjustment.
4. If the inlet pressures are correct and the burner
manifold pressure does not agree with that specified
on the dataplate, then the gas control valve’s internal
pressure regulator requires adjustment. See Fig. 14
for regulator location.
D. Completion
1. Once inlet and burner manifold pressures have been
confirmed and/or properly set, close the fuel supply
valve to the heater and allow the heater to burn off
any gas remaining in the gas supply line.
2. Disconnect the heater from its electrical supply.
3. Remove the gauges.
4. Reinstall the pressure tap plugs and tighten securely.
FIG. 13
FIG. 14

17
This heater has two high limit switches. One is located near
the heat chamber face, while the other is located on the fan
housing at the opposite end of the heater. The high limit
switches should be tested a minimum of once per year
when the heater is given a thorough cleaning.
1. Disconnect the heater from its electrical supply.
2. The high limit switches have different temperature
ratings. To eliminate confusion, remove and test only
one high limit switch at a time.
3. Holding the switch by one of its mounting legs or
electrical terminals, apply a small flame only to the
sensing portion on the back of the switch. Be ccareful
not ttommelt tthe pplastic hhousing ooftthe sswitch wwhen
conducting tthis ttest.
4. Within a minute, you should hear a “pop” coming
from the switch, which indicates the contacts of the
switch have opened. Check for lack of electrical
continuity across the switch terminals to verify
contacts have opened.
5. Allow the switch cool down for about a minute before
firmly pressing the red reset button on the switch.
6. Check for electrical continuity across the switch
terminals to make sure the contacts have closed.
7. Reinstall the switch back into the heater. Reconnect
the heater to its electrical supply. Start the heater
and check for proper operation.
FIG. 15
TESTING THE MANUAL RESET HIGH LIMIT SWITCH
WARNING
Fire HHazard
■Do not operate the appliance with the high limit switch
bypassed.
■Operating the heater bypassed high limit switch may
lead to overheating, possibly resulting in a fire, with
subsequent damage to the heater, building damage, or
loss of livestock.
RESET BUTTON
SENSING
SURFACE
TERMINAL
FLAME
MOUNTING
LEG

18
READ THIS ENTIRE SECTION BEFORE
BEGINNING TO TROUBLESHOOT PROBLEMS.
The troubleshooting flow charts on the following pages
provide systematic procedures for isolating equipment
problems. The charts are intended for use by a QUALIFIED
GAS HEATER SERVICE PERSON. DO NNOT SSERVICE TTHESE
HEATERS UUNLESS YYOU HHAVE BBEEN PPROPERLY TTRAINED.
TEST EQUIPMENT REQUIRED
The following pieces of test equipment will be required to
troubleshoot this system with minimal time and effort.
• Digital MMultimeter - for measuring AC and DC voltage and
resistance.
• Microamp DDiagnostic KKit - (PSI Part No. 120-08507)
When used with a standard digital multimeter, this kit
allows testing of the flame sensor on direct ignition
systems.
• Low PPressure GGauge - (PSI Part No. 550-00764) for
checking inlet and outlet pressures of the gas control
valve against dataplate rating.
INITIAL PREPARATION
■Visually inspect equipment for apparent damage.
■Check all hoses for abrasion and wear. Replace any
that are suspect.
■Make sure heater is properly installed and meets
minimum clearances to nearest combustible
materials. (Refer to dataplate on heater.)
■Check all wiring for loose connections and worn
insulation.
Refer to the system operation sequence in this section to
gain an understanding as to how the equipment operates
during a call for heat. Understanding the operation
sequence of the ignition module and related components
is essential as it will relate directly to problem solving
provided by the flow charts.
The ignition control module is self-diagnostic. The red
light on the module will flash a specific pattern depending
upon the problem which is diagnosed. To effectively use
the flow charts, you must first identify what the problem is
by the flashing pattern of the L.E.D. (light emitting diode)
diagnostic light. If the light is flashing, the flash pattern
will be followed by a pause and then a repeat of the flash
pattern until the problem is corrected. Refer to the tables
below to identify what page to refer to when
troubleshooting any problems.
The L.E.D. will only be on when the selector switch is
positioned to “Heat” and the thermostat is set above room
temperature. The L.E.D. will not be on when the selector
switch is positioned to “Vent”.
Heating MMode PProblems Page
L.E.D. Diagnostic light not on during a call for heat . . .20
L.E.D. diagnostic light flashing:
A. Rapid Flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
B. Long Flash (2 seconds on - 2 seconds off) . . . . .21
C. One Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
D. Two Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
E. Three Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
F. Four Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
G. Five Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
H. Six Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Components should be replaced only after each step has
been completed and replacement is suggested in the flow
chart.
Troubleshooting Guide
WARNING
Electrical SShock aand BBurn HHazard
■Troubleshooting this system may require operating the
unit with line voltage present and gas on. Use extreme
caution when working on the heater.
■Failure to follow this warning may result in property
damage, personal injury or death.

19
DIRECT IGNITION OPERATION SEQUENCE:
(Heating MMode)
— Line Voltage is Sent to Transformer
— 24 V.A.C. is sent from Transformer to the Thermostat
— A call for Heat Occurs
— 24 V.A.C. is sent from Thermostat to Ignition Control
Module
— Red Light on Ignition Module Begins to Glow
— Ignition Control Module Performs an Internal Safe Start
Check
-- Internal Components are Tested
-- Voltage is sent to Flame Sensor from Control Module
to Start Flame Proving Process
-- Air Flow Circuit is Checked
— Ignition Control Module Begins Safety Lockout Timing
— Ignition Control Module Starts Fan Motor for Prepurge
-- Air Flow Switch is Checked for Proper Operation
-- Module Stops the Fan Motor
— Ignition Control Module Powers the Igniter
— Ignition Control Module Restarts the Fan Motor (after
igniter warm-up)
-- Air Flow Switch Closes
-- Gas Control Valve Opens
— Ignition Occurs
-- Igniter stays “Powered-up” for 6 seconds after Ignition
-- Flame Proving occurs (in 6 seconds)
-- Igniter Shuts Off
-- Gas Valve Stays Open
— Room Warms to Desired Temperature
-- Thermostat is Satisfied
-- Heater Shuts Down
— Process Starts Again on Call for Heat
MULTIPLE IGNITION TRIAL SEQUENCE:
— First Trial for Ignition Takes Approximately 30 Seconds
— Two More Trials for Ignition will Occur
-- Second Trial Follows Immediately if First Trial Fails
-- Module Starts a 15 Minute “Wait” Period to Allow
Ignition Interruption to Pass
-- Third and Final Trial Occurs After 15 Minute Wait
Period
— If Ignition Control Module Does Not Prove Flame After
Third Trial, the Module Goes into Safety Lockout (3 Flash
Pattern)
-- Igniter Shuts Down
-- Fan Motor Stops
-- Gas Valve Closes
— To Manually Reset the Ignition System
-- Unplug the Heater and Plug it back in
-- OR --
Turn Thermostat to “Off” or “No Heat” and Then Back
to Above Room Temperature