Mestek IIEB-11 User manual

IIEB-11
J30-05390
08/12
INSTALLATION INSTRUCTIONS & PARTS LIST
POWER VENTED GAS FIRED BLOWER UNIT HEATERS
Model No. Serial No.
FORYOUR SAFETY
The use and storage of gasoline or other flammable vapors and liquids in open containers in
the vicinity of this appliance is hazardous.
ATTENTION: READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA PLATE FOR TYPE OF
GAS AND ELECTRICAL SPECIFICATIONS AND MAKE CERTAINTHATTHESE AGREE WITH THOSE AT POINT
OF INSTALLATION. RECORDTHE UNIT MODEL AND SERIAL No.(s) INTHE SPACE PROVIDED. RETAIN FOR
FUTURE REFERENCE.
APPROVED FOR USE IN CALIFORNIA
INSTALLER'S RESPONSIBILITY
Installer Please Note: This equipment has been test fired and inspected. It has been
shipped free from defects from our factory. However, during shipment and installation,
problems such as loose wires, leaks or loose fasteners may occur. It is the installer's
responsibility to inspect and correct any problems that may be found.
Install, operate and maintain unit in accordance with manufacturer's
instructions to avoid exposure to fuel substances or substances from incomplete
combustion which can cause death or serious illness. The state of California
has determined that these substances may cause cancer, birth defects, or other
reproductive harm.
Improper installation, adjustment, alteration, service or maintenance
can cause property damage, injury or death. Read the installation, operating and
maintenance instructions thoroughly before installing or servicing this equipment
FORYOUR SAFETY
If you smell gas:
1. Open windows.
2. Don’t touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
ENERGY
PERFORMANCE
VERIFIED
RENDEMENT
ENERGETIQUE
VERIFIE
CM
V
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D
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RECEIVING INSTRUCTIONS
Inspect shipment immediately when
received to determine if any damage
has occurred to the unit during
shipment. After the unit has been
uncrated, check for any visible
damage to the unit.If any damage is
found, the consignee should sign
the bill of lading indicating such
damage and immediately file claim
for damage with the transportation
company.
260 NORTH ELM ST., WESTFIELD, MA 01085
TEL: [phone] FAX: [phone]
www.mestek.com

TABLE OF CONTENTS
2
SPECIFICATIONS
Basic Description....................................................2
Performance & Specification Data..........................4
GENERAL SAFETY INFORMATION
Installation Codes...............................................2, 3
Special Precautions............................................2, 3
INSTALLATION
Locating Units.....................................................5, 6
Proper Clearances..............................................5, 6
Suspension of Units............................................5, 6
Air for Combustion .................................................6
Gas Supply Piping/Sizing.......................................7
Pipe Installation .....................................................8
Blower Set-up and Adjustment ........................9, 10
The following terms are used throughout this manual, in addition to ETL requirements, to bring
attention to the presence of potential hazards or to important information concerning the product:
DESCRIPTION
Figure 1 - PowerVented Blower Unit Heaters
See Identification of Parts Section
for unit components.
ELECTRICAL CONNECTIONS ................................11
VENTING.................................................12, 13, 14, 15
OPERATION
Spark Ignition..................................................16, 17
Main Burner Orifice Schedule...............................18
Adjustments..........................................................18
MAINTENANCE
Servicing & Cleaning............................................19
TROUBLESHOOTING GUIDE ...............20, 21, 22, 23
IDENTIFICATION OF PARTS........................24, 25, 26
Replacement Parts...............................................27
WARRANTY..............................................................27
INSPECTION SHEET................................................28
UNIT NUMBER DESCRIPTION................................29
The Power Vented Gas Blower Unit Heater is a factory
assembled, high static pressure type, centrifugal
blower unit designed for heavy duty applications such
as continuous operation or where a single unit heater
must do the entire heating job in a large area.These
blower type unit heaters may be used with the
standard adjustable louvers or with short duct runs
and discharge nozzles for spot heating.These blower
type unit heaters may be used where low sound levels
are required. The designs are certified by ETL as
providing a minimum of 80% thermal efficiency, and
approved for use in California. Do not alter these units
in any way. If you have any questions after reading this
manual, contact the manufacturer.
Front
View Rear
View
Indicates an imminently hazardous
situation which, if not avoided, may result in minor
injury or property damage.
NOTICE: Used to notify of special instructions on
installation, operation or maintenance which are
important to equipment but not related to personal
injury hazards.
Indicatesanimminentlyhazardous
situationwhich,ifnotavoided,willresultindeath,
serious injury or substantial property damage.
Indicatesanimminentlyhazardous
situation which, if not avoided, could result in
death, serious injury or substantial property
damage.

3
GENERAL SAFETY INFORMATION
Use only the fuel for which the heater is designed (see
rating plate). Using LP gas in a heater that requires
natural gas, or vice versa, will create the risk of gas
leaks, carbon monoxide poisoning and explosion.
Do not attempt to convert the
heater for use with a fuel other than the one
intended. Such conversion is dangerous, as it
will create the risks listed previously.
Make certain that the power source conforms to the
electrical requirements of the heater.
Do not depend upon a thermostat
or other switch as sole means of disconnecting
power when installing or servicing heater. Always
disconnect power at main circuit breaker as
described above. Failure to do so could result in
fatal electric shock.
Special attention must be given to any grounding
information pertaining to this heater.To prevent the risk
of electrocution, the heater must be securely and
adequately grounded.This should be accomplished by
connecting a grounded conductor between the service
panel and the heater.To ensure a proper ground, the
groundingmeansmustbetested byaqualifiedelectrician.
Do not insert fingers or foreign objects into the heater or
its air moving device. Do not block or tamper with the
heater in any manner while in operation or just after it
has been turned off, as some parts may be hot enough
tocause injury.
This heater is intended for general heating applications
ONLY. It must NOT be used in potentially dangerous
locations such as flammable, explosive, chemical-laden
or wet atmospheres.
In cases in which property damage may result from
malfunction of the heater, a backup system or a
temperature sensitive alarm should be used.
The open end of piping systems being
purgedshallnotdischargeintoareaswherethereare
sources of ignition or into confined spaces UNLESS
precautions are taken as follows:(1) by ventilation of
the space, (2) control of purging rate, (3) elimination
of all hazardous conditions.All precautions must be
taken to perform this operation in a safe manner!
Unless otherwise specified, the following conversions
may be used for calculating SI unit measurements:
1foot= 0.305m
1inch = 25.4mm
1psig = 6.894kPa
1pound = 0.453kg
1gallon = 3.785L
1cubic foot=0.028 m3
Failure to comply with the general
safety information may result in extensive
propertydamage,severe personalinjury or death.
This product must be installed by
a licensed plumber or gas fitter when installed
within the Commonwealth of Massachusetts.
Installation must be made in accordance with
local codes, or in absence of local codes, with the
latest edition of ANSI Standard Z223.1 (N.F.P.A.
No.54) National Fuel Gas Code. All of the ANSI
and NFPA Standards referred to in these installation
instructions are those that were applicable at the time
the design of this appliance was certified. The ANSI
Standards are available from the American National
Standards Institute, Inc., www.ansi.org. The NFPA
Standardsare availablefrom theNational Fire Protection
Association, Batterymarch Park, Quincy, MA 02269.
These unit heaters are designed for use in airplane
hangars when installed in accordance with ANSI/NFPA
No. 409 and in public garages when installed in
accordancewith NFPA No.88A andNFPANo.88B.
If installed in Canada, the installation must conform
with local building codes, or in absence of local building
codes, with CSA-B149.1 “Installation Codes for Natural
GasBurning Appliances and Equipment"or CSA-B149.2
“Installation Codes for Propane Gas Burning Appliances
andEquipment”.TheseUnit Heatershave beendesigned
and certified to comply with CSA 2.6. Also see sections
on installation in AIRCRAFT HANGARS and PUBLIC
GARAGES.
Do not alter the unit heater in any
wayor damage to the unit and/or severepersonal
injury or death may occur!
Disconnect all power and gas
supplies before installing or servicing the heater.
If the power disconnect is out of sight, lock
it in the open position and tag it to prevent
unexpected application of power. Failure to do
so could result in fatal electric shock, or severe
personal injury.
Ensure that all power sources
conform to the requirements of the unit heater or
damage to the unit will result!
Follow installation instructions CAREFULLY to avoid
creating unsafe conditions. All wiring should be done
and checked by a qualified electrician, using copper
wire only. All gas connections should be made and leak-
tested by a suitably qualified individual, per instructions
in this manual.Also follow procedures listed on the “Gas
Equipment Start-Up Sheet” located in this manual.
1inch watercolumn =0.249 kPa
1000Btu/Cu.Ft.=37.5MJ/m3
1000Btu per hour= 0.293 kW
liter/second= CFM x0.472
meter/second= FPM ÷196.8

Unit Size 100 125 150 175 200 225 250 300 350 400
PERFORMANCE DATA ‡
Input BTU/Hr 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000
(kW) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)
Output BTU/Hr 80,000 100,000 120,000 140,000 160,000 180,000 200,000 240,000 280,000 320,000
(kW) (23.4) (29.3) (35.1) (41.0) (46.9) (52.7) (58.6) (70.3) (82.0) (93.7)
Thermal Efficiency (%) 80 80 80 80 80 80 80 80 80 80
Free Air Delivery CFM 1,200 1,575 1,975 2,300 2,400 2,600 2,850 3,950 4,600 4,800
(cu. m/s) (0.566) (0.743) (0.932) (1.086) (1.133) (1.227) (1.345) (1.864) (2.171) (2.266)
Air Temperature Rise F Deg. 62 59 56 56 62 64 65 56 56 62
(C Deg.) (34) (33) (31) (31) (34) (36) (36) (31) (31) (34)
Outlet Velocity FPM 880 950 1,030 1,045 965 935 930 1,080 1,090 1,000
(m/s) (4.47) (4.83) (5.23) (5.31) (4.90) (4.75) (4.72) (5.49) (5.54) (5.08)
Full Load Amps at 115V 8.3 9.8 10.6 10.6 15.2 15.2 15.2 15.2 18.6 18.6
MOTOR DATA : Motor HP 1/4 1/3 1/2 1/2 3/4 3/4 3/4 3/4 1 1
Motor (kW) (0.19) (0.25) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.75) (0.75)
Motor Type SPH SPH SPH SPH SPH SPH SPH SPH cap.start cap.start
R.P.M. 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1,725
Amps @ 115V 5.1 6.6 7.4 7.4 12.0 12.0 12.0 12.0 15.4 15.4
DIMENSIONAL DATA in. (mm)
“A” Height to Top of Unit 31-1/4 31-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4
(794) (794) (921) (921) (921) (921) (921) (921) (921) (921)
“B” Width of Unit 17-7/8 20-5/8 20-5/8 23-3/8 26-1/8 28-7/8 31-5/8 37-1/8 42-5/8 48-1/8
(454) (524) (524) (594) (664) (733) (803) (943) (1083) (1222)
“C” Height to Top of Hanger 34-1/8 34-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8
(867) (867) (994) (994) (994) (994) (994) (994) (994) (994)
“D” Depth to Rear of Housing 42-5/8 44-1/4 44-1/4 47 47 51 51 48-1/4 51 51
(1083) (1124) (1124) (1194) (1194) (1295) (1295) (1226) (1295) (1295)
“E” Hanging Distance Width 14-1/2 17-1/4 17-1/4 20 22-3/4 25-1/2 28-1/4 33-3/4 39-1/4 44-3/4
(368) (438) (438) (508) (578) (648) (718) (857) (997) (1137)
“F” Discharge Opening Width 15-3/8 18-1/8 18-1/8 20-7/8 23-5/8 26-3/8 29-1/8 34-5/8 40-1/8 45-5/8
(391) (460) (460) (530) (600) (670) (740) (879) (1019) (1159)
“J” to Centerline of Flue 5-7/8 7-1/4 7-1/4 8-5/8 10 11-1/4 12-3/4 15-1/2 18-1/4 21
(149) (184) (184) (219) (254) (286) (324) (394) (464) (533)
“L” Hanger Location 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8
(416) (416) (416) (416) (416) (416) (416) (416) (416) (416)
“M” Hanging Distance Depth 16-3/8 16-3/8 16-3/8 17-7/8 17-7/8 21-7/8 21-7/8 21-7/8 21-7/8 21-7/8
(416) (416) (416) (454) (454) (556) (556) (556) (556) (556)
Flue Size Dia-in. * 4 4 4 4 5 5 5 6 6 6
(Dia-mm) (102) (102) (102) (102) (127) (127) (127) (152) (152) (152)
Blower Size-in. 9 10 10 12 12 12 12 (2) 10 (2) 12 (2) 12
Gas Inlet-Natural Gas-in. 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
Gas Inlet-LP Gas-in. 1/2 1/2 1/2 1/2 1/2 1/2 OR 3/4
Approx. Shipping Wt. lb. 262 279 314 336 363 408 427 471 561 594
(kg) (119) (127) (142) (152) (165) (185) (194) (214) (254) (269)
4
DIMENSIONS .XXX STANDARD UNITS
DIMENSIONS IN PARENTHESIS (XXX) MILLIMETERS
Figure 2 -
Unit
Dimensions
Table 1 – Performance and Dimensional Data – PowerVented Blower Unit Heater
‡ Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610m). For installations in USA above 2000 ft. (610m), the unit input must be derated 4% for each 1000 ft. (305m) above
sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the National Fuel Gas Code, ANSI Standard Z223.1 (N.F.P.A. No. 54).
For installations in Canada, any references to deration at altitudes of 2000 ft. (610m) are to be ignored. At altitudes of 2000 to 4500 ft. (610 to 1372m), the unit must be derated to 90% of the normal
altitude rating, and be so marked in accordance with the ETL certification.
LEGEND:
SPH = SPLIT PHASE
CAP. START = CAPACITOR START

PUBLIC GARAGES: In repair garages, unit heaters
must be at least 8 feet (2.4m) above the floor. Refer to
the latest edition of NFPA No.88B, Repair Garages.
In parking structures, unit heaters must be installed
so that the burner flames are located a minimum of 18
inches (457mm) above the floor or protected by a partion
not less than 18 inches (457mm) high.However, any unit
heater mounted in a parking structure less than 8 feet
(2.4m) above the floor must be equipped with an OSHA
approved fan guard.Refer to the latest edition of NFPA
88A, Parking Structures.
In Canada, installation must be in accordance with the
latest edition of CSA-B149 “Installation Codes for Gas
Burning Appliances and Equipment.”
AIR DISTRIBUTION: Direct air towards areas of
maximum heat loss.When multiple heaters are involved,
circulation of air around the perimeter is recommended
where heated air flows along exposed walls. Satisfactory
results can also be obtained where multiple heaters are
located toward the center of the area with heated air
directed toward the outside walls. Be careful to avoid
all obstacles and obstructions which could impede the
warm air distribution patterns. Heat throw distances are
presented in Figure 3 and Table 2.
Figure 3 - HeatThrow Distances
5
INSTALLATION
Do not install unit heaters in
corrosiveorflammableatmospheres! Premature
failureof,or severedamagetothe unit will result!
Avoid locations where extreme
drafts can affect burner operation. Unit heaters
must not be installed in locations where air
for combustion would contain chlorinated,
halogenated or acidic vapors. If located in such
an environment, premature failure of the unit
will occur!
Since the unit is equipped with an automatic gas ignition
system,theunit heatermustbe installed suchthat thegas
ignition control system is not directly exposed to water
spray, rain or drippingwater.
NOTE: Location of unit heaters is related directly to
the selection of sizes. Basic rules are as follows:
MOUNTING HEIGHT: Unit Heaters must be installed at
a minimum of 8 feet (2.4m) above the floor, measured
to the bottom of the unit. At heights above 8 feet (2.4m),
less efficient air distribution will result. Occasionally unit
heaters must be mounted at heights of 12 to 16 feet
(3.7 to 4.9m) in order to clear obstacles. When this is
the case, it is advisable to use centrifugal blower unit
heaters.
AIRCRAFT HANGARS: Unit Heaters must be installed
in aircraft hangars and public garages as follows: In
aircraft hangars, unit heaters must be at least 10 feet
(3.05m) above the upper surface of wings or engine
enclosures of the highest aircraft to be stored in the
hangar and 8 feet (2.44m) above the floor in shops,
offices and other sections of the hangar where aircraft
are not stored or housed. Refer to current ANSI/NFPA
No. 409, Aircraft Hangars. In Canada, installation is
suitable in aircraft hangars when acceptable to the
enforcing authorities.
NR = Not recommended
ft. 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000
(m) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)
8 60 65 70 75 80 85 90 105 110 120
(2.4) (18.3) (19.8) (21.3) (22.9) (24.4) (25.9) (27.4) (32.0) (33.5) (36.6)
10 54 56 60 64 68 72 78 90 95 100
(3.0) (16.5) (17.1) (18.3) (19.5) (20.7) (21.9) (23.8) (27.4) (29.0) (30.5)
12 44 46 49 57 61 65 68 80 84 90
(3.7) (13.4) (14.0) (20.7) (17.4) (18.6) (19.8) (20.7) (24.4) (25.6) (27.4)
15 NR NR 45 49 52 56 60 70 74 80
(4.6) NR NR (22.6) (14.9) (15.8) (17.1) (18.3) (21.3) (22.6) (24.4)
20 NR NR NR NR 46 50 54 63 66 70
(6.1) NR NR NR NR (14.0) (15.2) (16.5) (19.2) (20.1) (21.3)
“H”
Distance From
Floor to Bottom
of Unit UNIT SIZE BTU/Hr (kW)
Table 2 - Standard Applications - Heat Throw Distances (Approximate)

Make certain that the lifting
methods used to lift the unit heater and the
structure to which the heater is to be mounted
is capable of safely supporting its weight. Under
no circumstances must the gas lines, venting
system or the electrical conduit be used to
support the heater or should any other objects
(ie. ladder/person) lean against the heater, gas
lines or electrical conduit for support. Failure
to heed these warnings may result in property
damage, personal injury or death.
Unit heaters must be hung level from
side to side and from front to back; see Figures
2, 4 and 5. Failure to do so will result in poor
performance and or premature failure of the unit.
Insure that all hardware used in
the suspension of each unit heater is more than
adequate for the installation. Failure to do so
may result in extensive property damage, severe
personal injury or death!
Refer to Figures 4 and 5, and dimensional data per
Table 1 and Figure 2 for suspension of units.
Figure 4 - Heater Mounting*
*All hanging hardware and wood is not included with the unit
(To be field supplied).
Figure 5 - Heater Mounting 100/400 MBTU Sizes
Unit Sizes
6
INSTALLATION (continued)
The installation is to be adjusted to obtain an air
throughput within the range specified on the rating plate.
Unit heaters should not be installed to maintain low
temperatures and/or freeze protection of buildings.
A minimum of 50°F (10°C) thermostat setting must
be maintained. If unit heaters are operated to maintain
lower than 50°F (10°C), hot flue gases are cooled inside
the heat exchanger to a point where water vapor (a flue
gas by-product) condenses onto the heat exchanger
walls. The result is a mildly corrosive acid that
prematurely corrodes the aluminized heat exchanger
and can actually drip water down from the unit heater
onto floor surface. Additional unit heaters should be
installed if a minimum 50°F (10°C) thermostat setting
cannot be maintained.
AIR FOR COMBUSTION:The Unit Heater shall be
installed in a location in which the facilities for
ventilation permit satisfactory combustion of gas,
proper venting, and the maintenance of ambient
temperature at safe limits under normal conditions
of use. The Unit Heater shall be located in such a
manner as not to interfere with proper circulation of air
within the confined space.When buildings are so tight
that normal infiltration does not meet air requirements,
outside air shall be introduced per Sections 1.3.4.2 and
1.3.4.3 of ANSI Z223.1 for combustion requirements.A
permanent opening or openings having a total free area
of not less than one square inch per 5,000 BTU/HR.
(1.5 Kw) of total input rating of all appliances within the
space shall be provided.
NOTICE: Unit heater sizing should be based on heat
loss calculations where the unit heater output equals
or exceeds heat loss.
CLEARANCES: Each Gas Unit Heater shall be located
with respect to building construction and other equipment
so as to permit access to the Unit Heater. Clearance
between walls and the vertical sides of the Unit Heater
shall be no less than 18 inches (457 mm). A minimum
clearance of 6 inches (152 mm) must be maintained
between the top of the Unit Heater and the ceiling.The
bottom of the Unit Heater must be no less than 12 inches
(305 mm) from any combustible. However, in order to
ensure access to the burner compartment, a minimum
distance of 21 inches (533 mm) is required.The distance
between the flue collector and any combustible must
be no less than 6 inches (152 mm). Also see AIR FOR
COMBUSTION and VENTING sections.
NOTICE: Increasing the clearance distances may
be necessary if there is a possibility of distortion or
discoloration of adjacent materials.

INSTALLATION – GAS SUPPLY PIPING/SIZING
NOTICE: If more than one gas unit heater is to be
served by the same piping arrangement, the total cu
ft/hr input and length of pipe must be considered.
NOTICE: If the gas unit heater is to be fired with LP
gas, consult the local LP gas dealer for pipe size
information.
NOTE: HEATER INSTALLATION FOR USE WITH
PROPANE (BOTTLED) GAS MUST BE MADE BY A
QUALIFIED L.P. GAS DEALER OR INSTALLER. HE
WILL ENSURETHAT PROPER JOINT COMPOUNDS
ARE USED FOR MAKING PIPE CONNECTIONS;
THAT AIR IS PURGED FROM LINES; THAT A
THOROUGHTEST IS MADE FOR LEAKS BEFORE
OPERATING HEATER; ANDTHAT IT IS PROPERLY
CONNECTEDTO PROPANE GAS SUPPLY SYSTEM.
Before any connection is made to an existing line
supplying other gas appliances, contact the local gas
company to make certain that the existing line is of
adequate size to handle the combined load.
7
Table 3 - Gas Pipe Size
1. Determine the required Cu. Ft. / Hr.by dividing the rated heater input by 1000.For SI / Metric measurements: Convert unit Btu. / Hr. to
kilowatts. Multiply the unit input (kW) by 0.0965 to determine Cubic Meters / Hour. 2. FOR NATURAL GAS: Select the pipe size directly
from the table. 3. FOR PROPANE GAS: Multiply the Cu. Ft./ Hr.(Cubic Meters per Hour) value by 0.633;then use the table. 4. Refer to
the metric conversion factors listed in General Safety section for more SI unit measurements/conversions.
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour (Cubic Meters per Hour) for Gas Pressures of 0.5 psig (3.5 kPa) or Less,
and a Pressure Drop of 0.5 Inch Water Column (124.4 Pa)
(Based on a 0.60 Specific Gravity Gas)
Nominal
Iron Internal Length of Pipe, Feet (meters)
Pipe Size Dia. 10 20 30 40 50 60 70 80 90 100 125 150 175 200
in. in. (3.0) (6.1) (9.1) (12.2) (15.2) (18.3) (21.3) (24.4) (27.4) (30.5) (38.1) (45.7) (53.3) (61.0)
1/2 0.622 175 120 97 82 73 66 61 57 53 50 44 40 37 35
(4.96) (3.40) (2.75) (2.32) (2.07) (1.87) (1.73) (1.61) (1.50) (1.42) (1.25) (1.13) (1.05) (0.99)
3/4 0.824 360 250 200 170 151 138 125 118 110 103 93 84 77 72
(10.2) (7.08) (5.66) (4.81) (4.28) (3.91) (3.54) (3.34) (3.11) (2.92) (2.63) (2.38) (2.18) (2.04)
1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135
(19.3) (13.2) (10.6) (9.06) (8.07) (7.36) (6.80) (6.23) (5.80) (5.52) (4.96) (4.53) (4.11) (3.82)
1 1/4 1.380 1400 950 770 660 580 530 490 460 430 400 360 325 300 280
(39.6) (26.9) (21.8) (18.7) (16.4) (15.0) (13.9) (13.0) (12.2) (11.3) (10.2) (9.20) (8.50) (7.93)
1 1/2 1.610 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430
(59.5) (41.3) (33.4) (28.0) (25.5) (22.9) (21.2) (19.5) (18.4) (17.6) (15.6) (14.2) (13.0) (12.2)
2 2.067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800
(112) (77.9) (62.3) (53.8) (47.6) (43.0) (39.6) (36.8) (34.5) (32.6) (28.9) (26.9) (24.1) (22.7)
2 1/2 2.469 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280
(178) (123) (99.7) (85.0) (75.0) (68.0) (63.7) (58.0) (55.2) (52.4) (46.7) (42.5) (38.8) (36.2)
3 3.068 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280
(311) (218) (177) (150) (135) (122) (110) (105) (97.7) (92.0) (83.5) (75.0) (69.4) (64.6)
4 4.026 23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 6000 5500 5000 4600
(651) (447) (362) (309) (275) (249) (229) (212) (204) (190) (170) (156) (142) (130)
PIPE SIZING
To provide adequate gas pressure at the gas unit
heater, size the gas piping as follows:
1. Find the cu ft/hr by using the following formula:
Input
Cu ft/hr = Btu per Cu ft
2. Refer to Table 3. Match “Pipe Run in Feet” with
appropriate “Gas Input - Cu Ft/Hr” figure. This
figure can then be matched to the pipe size at the
end of the column.
Example: It is determined that a 67 foot (20.4m) run of
gas pipe is required to connect a 200 MBTU gas unit
heater to a 1,000 Btu/cu.ft (0.29 kW) natural gas supply.
200,000 Btu/hr
= 200 Cu ft/hr
1,000 Btu/cu ft
Using Table 3, a 1 inch pipe is needed.
NOTICE: See General Safety Information section for
english/SI (metric) unit conversion factors.
To avoid equipment damage or possible personal injury, do not connect gas piping
to this unit until a supply line pressure/leak test has been completed. Connecting the unit before
completing the pressure/leak test may damage the unit gas valve and result in a fire hazard.
Do not rely on shut off valve to isolate the unit while conducting gas pressure/leak tests.These valves
may not be completely shut off, exposing the unit gas valve to excessive pressure and damage.

Check all pipe joints for leakage
using a soap solution or other approved
method. Never use an open flame or severe
personal injury or death may occur.
Figure 6 - Pipe Installation, Standard Controls
Never use an open flame to detect
gas leaks. Explosive conditions may exist which
would result in personal injury or death.
The appliance and its individual shutoff valve must
be disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of 1/2 psig (3.5 kPa).
The appliance must be isolated from the gas supply
piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than
1/2 psig (3.5 kPa).
Table 4 - Gas Piping Requirements*
PIPE INSTALLATION
1. Install the gas piping in accordance with applicable
local codes.
2. Check gas supply pressure. Each unit heater
must be connected to a manifold pressure and
a gas supply capable of supplying its full rated
capacity as specified in Table 4. A field LP tank
regulator must be used to limit the supply pressure
to maximum of 14 inches W.C. (3.5 kPa). All piping
should be sized in accordance with the latest
edition of ANSI Standard Z223.1 National Fuel
Gas Code; in Canada, according to CSA B149.
See Tables 1 and 3 for correct gas supply piping
size. If gas pressure is excessive on natural gas
applications, install a pressure regulating valve in
the line upstream from the main shutoff valve.
3. Adequately support the piping to prevent strain on
the gas manifold and controls.
4. To prevent the mixing of moisture with gas, run the
take-off piping from the top, or side, of the main.
5. Standard gas unit heaters, optional two-stage units,
and hydraulic modulating units are supplied with a
combination valve which includes:
(a) Manual “A” valve (b) Manual “B” valve
(c) Solenoid valve (d) Pilot safety (e) Pressure
regulator
Pipe directly in to combination valve (see Figure 4).
6. A 1/8 inch N.P.T.plugged tapping, accessible for test
gauge connection, must be installed immediately
upstream of the gas supply connection to the
appliance
7. Provide a drip leg in the gas piping near the gas
unit heater. A ground joint union and a manual gas
shutoff valve should be installed ahead of the unit
heater controls to permit servicing. The manual
main shutoff valve must be located external to the
jacket. See Figure 6.
8. Make certain that all connections have been
adequately doped and tightened.
CAUTION: Do not overtighten the inlet gas piping
into the valve. This may cause stresses that would
crack the valve!
NOTICE: Use pipe joint sealant resistant to the
action of liquefied petroleum gases regardless of
gas conducted.
8
GasType
Manifold
Pressure
Supply Inlet
Pressure
Natural Gas
3.5 in.W.C.
(0.9 kPa)
14 in.W.C. Max.
(3.5 kPa)
5.0 in W.C. Min.
(1.2 kPa)
Propane (LP) Gas
10.0 in.W.C.
(2.5 kPa)
14 in.W.C. Max.
(3.5 kPa)
11.0 in W.C. Min.
(2.7 kPa)
*For single stage applications only at normal altitudes.
D3631C

9
INSTALLATION (continued)
Never operate the unit beyond
the specified limits or severe damage to, and or
premature failure of, the unit will result!
BLOWER SET UP
The drive ratio of the motor and blower sheaves has
been preset at the factory for a temperature rise of 65°F
at 0 inch W.C.If the unit is to be operated under different
air flow or pressure requirements, the drive ratio must
be altered by means of the adjustable sheave on the
blower motor, Figure 7.
1. Ensure that all packing material, support blocks, etc.
have been removed from the unit.
2. Adjust the blower drive belt tension by means of the
two tension bolts on the blower motor base.When
proper tension has been achieved, the mid-point
deflection of the belt will be 3/4 inch when subjected
to a 5 lb. force.
3. Recheck all electrical connections.
4. When power is applied, ensure that the motor and
blower are rotating in a clockwise direction when
viewed from the drive side.
5. Measure the current draw of the motor.
The "at speed" current draw of the
motor must never exceed that specified on the
motor rating plate or severe damage to the motor
will result!
* NOTICE: THE BLOWER ASSEMBLY FOR THE 100/250 UNITS
CONSISTS OF 1 WHEEL, 1 HOUSING, 1 SHAFT AND 1 BEARING
SET. FOR 300/400 UNITS THE BLOWER ASSEMBLY CONSISTS OF
2 WHEELS, 2 HOUSINGS, 1 SHAFT AND 1 BEARING SET.
Figure 7 - Motor & Blower Assembly *
* PART DESCRIPTION
A. Blower Housing
B. Blower Wheel
C. Blower Shaft
D. Bearings (sets only)
E. Drive Pulley (standard)
F. Driven Pulley (standard)
G. V-Belt
H. Motor
BLOWER DRIVE ADJUSTMENT
Never attempt to adjust the drive
belt without first disconnecting all electrical
power to the unit or severe personal injury may
result!
1. Remove the belt guard and loosen the belt tension
bolts on the blower motor base.
2. Loosen the set screw on the adjustable half of the
motor sheave.To increase the blower speed, turn
the adjustable half of the sheave clockwise, counter
clockwise to slow the blower. Retighten the set
screw.
3. Realign the blower and motor sheaves if necessary.
4. Adjust the belt tension as specified in the BLOWER
SET UP section under step 2.
5. Replace the belt guard.
Never operate the unit without
the belt guard in place or severe personal injury
may result!
6. Check that the air flow of the unit, the rpm
and current draw of the blower motor and the
temperature rise are within the limits specified in
Table 1, the blower motor rating plate and the rating
plate on the unit, respectively (also see Motor Data
on page 10).

VOLTAGE – PHASE
IVL44
2.8-3.8 AK51
4.7
STARTER
SIZE
—
00
—
00
—
00
—
00
0/00
0
SHAFT
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
RPM
1725
1725
1725
1725
1725
1725
1725
1725
1725
1725
PH
1
3
1
3
1
3
1
3
3
3
Turns Open
IVL34
1.9-2.9 AL64 6.0 AL74 7.0 AL84 8.0
AK56
5.2 AL104 10.0
MOTOR PULLEYS
FRAME
56
56
56
56
56
56
56
56
56
56
BLOWER PULLEYS
Table 7 - PulleyTable 1725 RPM Motors (1/3 to 3 H.P.)
Table 5 - Motor Data
VOLTAGE
115/230
208/230/460
115/230
208/230/460
115/230
208/230/460
115/230
208/230/460
208/230/460
208/230/460
H.P.
1/2
1/2
3/4
3/4
1
1
1-1/2
1-1/2
2
3
NOTES: 1. Motors are typically permanent lube, ball bearing drive with class “B” windings.
2. All motors through 3 H.P. are equipped with auto reset overloads.
3. Single phase motors 1-1/2 H.P. and larger and all 3 phase motors require a contactor (or starter if specified).
4. Motor frame must not exceed NEMA frame 56.
*Average value, all speeds and frequencies.
10
327
345
362
380
397
414
431
448
466
483
500
518
535
552
569
587
604
621
638
656
410
431
453
474
496
517
539
560
582
604
625
647
668
690
712
733
755
776
798
819
468
493
517
542
567
591
616
641
665
690
715
739
764
789
813
838
863
887
912
936
546
575
603
633
661
690
719
748
776
805
834
863
891
920
949
978
1006
1035
1064
1093
630
663
697
730
763
796
829
863
896
928
962
995
1028
1061
1094
1127
1161
1194
1227
1260
697
734
771
807
844
880
918
954
991
1027
1064
1101
1137
1174
1211
1247
1284
1321
1357
1394
5
4-1/2
4
3-1/2
3
2-1/2
2
1-1/2
1
1/2
0
5
4-1/2
4
3-1/2
3
2-1/2
2
1-1/2
1
1/2
0
Table 6 - Motor Full Load Amps*
230-1
4.9
6.9
8.0
10.0
12.0
17.0
208-3
2.2
3.1
4.1
6.0
7.8
11.0
230-3
2.0
2.8
3.5
5.0
6.5
9.0
460-3
1.0
1.4
1.8
2.5
3.3
4.5
208-1
5.4
7.6
8.4
10.5
12.6
17.8
115-1
9.8
13.8
16.0
—
—
—
H.P.
1/2
3/4
1
1-1/2
2
3

* Thermostat wires tagged “W” and “G” must be
connected together except when using a general purpose
"SPDT" 24VAC relay and a standard thermostat with
subbase, or when using Honeywell T834H-1009 or
T834H-1017 thermostats. Also refer to Figure 8 for other
wiring connections.
Figure 8 - C1267G
THERMOSTAT HEAT ANTICIPATOR ADJUSTMENTS:
The initial heat anticipator setpoint should equal the
thermostat's current amperage draw when the unit is
firing. This setpoint should be measured for the best
results. Use the recommended ranges as a guide. If
further information is needed, consult your thermostat
manufacturer's instructions.
Recommended Heat Anticipator Setting Ranges:
25 ft. (7.6m) 50 ft. (15.2m)
Gas IgnitionType T'stat Wiring T'statWiring
For Power Vented Units: 0.85 to 0.90 A 0.90 to 1.1 A
Intermittent (Spark) Max. Setting
on T'stat
FANTIME DELAY CONTROL
Leads from time delay controls are factory wired to
the junction box. The fan control is a time delay relay
(approximately 45 seconds ON, 65 seconds OFF).The
fan control is rated at 17 amps.
NOTICE: The start-up fan delay must not exceed 90
seconds from a cold start.
IMPORTANT: For all wiring connections, refer to the
wiring diagram that your unit is equipped with (either
affixed to the side jacket or enclosed in your unit's
installation instruction envelope). Should any original
wire supplied with the heater have to be replaced,
it must be replaced with wiring material having a
temperature rating of at least 105°C.
Should any high limit switch wires have to be
replaced, they must be replaced with wiring material
having a temperature rating of 200°C minimum.
11
ELECTRICAL CONNECTIONS
HAZARDOUSVOLTAGE!
disconnect ALL ELECTRIC
POWER INCLUDING REMOTE
DISCONNECTS BEFORE
SERVICING. Failure to
disconnect power before
servicing can cause severe
personal injury or death.
Standard units are shipped for use on 115 volt, 60 hertz
single phase electric power.The motor name-plate and
electrical rating on the transformer should be checked
before energizing the unit heater electrical system. All
external wiring must conform to the latest edition of
the ANSI/NFPA No. 70, National Electrical Code and
applicable local codes; in Canada, to the Canadian
Electrical Code, Part 1 CSA Standard C22.1.
Do not use any tools (i.e.screwdriver,
pliers,etc.) across the terminals to check for power.
Use a voltmeter.
The transformer supplied with this unit heater is
internally fused. Any overload or short circuit will ruin
the transformer.
It is recommended that the electrical power supply to
each unit heater be provided by a separate, fused and
permanently live electrical circuit. A disconnect switch
of suitable electrical rating for each unit heater should
be located as close to the gas valve and controls as
possible. Each unit heater must be electrically grounded
in accordance with the latest edition of the National
Electric Code, ANSI/NFPA No. 70 or CSA Standard
C22.1.
THERMOSTAT WIRING AND LOCATION
NOTICE:The thermostat must be mounted on a
vertical vibration-free surface free from air currents
and in accordance with the furnished instructions.
Mount the thermostat approximately 5 feet (1.5 m) above
the floor in an area where it will be exposed to a free
circulation of average temperature air. Always refer to the
thermostat instructions as well as our unit wiring diagram
and wire accordingly. Avoid mounting the thermostat in
the following locations:
1. Cold areas - Outside walls or areas where drafts
may affect the operation of the control.
2. Hot areas - Areas where the sun's rays, radiation, or
warm air currents may affect control operation.
3. Deadareas - Areas whereair cannot circulatefreely,
such as behind doors or in corners.

12
VENTING FOR POWER VENTED (CATEGORY III) UNIT HEATERS
The venting system for these appliances shall terminate
at least four feet (1.2m) below, four feet (1.2m) horizontal
from, or one foot (0.3m) above any door, window, or
gravity air inlet into any building.
Through the wall vents for these appliances shall NOT
terminate over public walkways, or over an area where
condensate or vapor could create a nuisance or hazard
or could be detrimental to the operation of regulators,
relief valves, or other equipment.
The vent pipe equivalent length must be 5 feet (1.5 m)
minimum and must not exceed 50 feet (15.2 m).
Equivalent length is the total length of straight sections
PLUS 15 feet (4.6m) for each 90 degree elbow, 8 feet
(2.4 m) for each 45 degree elbow, and 10 feet (3.0m) for
the vent cap. An elbow should never be attached
directly to the venter!
Maintain 6 inch (152mm) between vent pipe and
combustible materials. A minimum of 12 inch (305mm)
of straight pipe is required from the venter outlet before
installing an elbow in the vent system.
Figure 9 - Horizontal Left Vent Position
(Rear View of Unit Heater)
Figure 10 - Horizontal Right Vent Position
(Rear View of Unit Heater)
Figure 11 -VerticalVent Position
(Side View of Unit Heater)
All unit heaters must be vented! All venting
installations shall be in accordance with the latest
edition of Part 7, venting of Equipment of the National
Fuel Gas Code, ANSI Z223.1, or applicable provisions
of local building codes for natural or power vented units.
For Canadian installations, also see page 13.
Power vented units are designed to be used with single
wall vent pipe utilizing horizontal or vertical venting
arrangements (see Figures 9, 10 and 11). These
arrangements may terminate external to the building
using either a single wall or double wall (Type B)
vent. See Figures 9 thru 16 for special installation
requirements regarding these venting conditions.
CARBON MONOXIDE!
Your venting system must not be blocked by
any snow, snow drifts, or any foreign matter.
Inspect your venting system to ensure
adequate ventilation exists at all times! Failure
to heed these warnings could result in Carbon
Monoxide Poisoning (symptoms include
grogginess, lethargy, inappropriate tiredness, or
flu-like symptoms).
Do not use a type B (double
wall) vent internally within the building on our
power vented units!
If double wall venting is used, components which
are UL Listed and approved for Category III positive
pressure venting systems MUST be used.
A Briedart Type L, Field Starkap or an equivalent
vent cap must be supplied by the customer
for each power vented unit. The vent pipe
diameter MUST be as specified in Table 1 (“D”
Dia. Flue Opening). A reducer must be field
installed for 100 through 175 MBH Unit Sizes.
All 300 through 400 MBH Unit sizes are factory
equipped with the required flue increaser. Refer to
Figure 10 for additional requirements.
Vent Systems -Termination Clearance Requirements*
MinimumClearancesfor
Structure Termination Locations
4 feet below
Door, window or any gravity air inlet 4 feet horizontally
1 foot above
Forced air inlet within 10 ft. 3 feet above
Adjoining building or parapet 6 feet
Adjacent public walkways 7 feet above grade
* If the vent terminal is to be installed near ground level, the vent
terminal must be positioned at least twelve inches above the maximum
anticipated snow depth (see page 13 for Canadian requirements).
Tee With Drip Leg &
Cleanout Cap At Lowest
Point Of Vent System (Typ.) D4072
To Horizontal Flue
Vent Termination
Reducer/Increaser
Where Applicable
Power Venter
D4071
AIR FLOW
Power Venter
Tee With
Drip Leg &
Cleanout Cap
To Vertical Flue
Vent Termination
Reducer/Increaser
Where Applicable
Power Venter
Tee With Drip Leg &
Cleanout Cap At Lowest
Point Of Vent System (Typ.)
D4073
To Horizontal Flue
Vent Termination
Reducer/Increaser
Where Applicable

13
Figure 12 - Adaptor Installation
REFER TO SPECIFICATION TABLE AND INSTALLATION MANUAL FOR PROPER USAGE
The following instructions apply to Canadian installations in addition to installation and operating instructions:
1. Installation must conform with local building codes, or in absence of local codes, with current CSA B149.1 installation codes for natural gas
burning appliances and equipment, or CSA B149.2, installation codes for propane gas burning appliances and equipment.
2. Any references to U.S. standards or codes in these instructions are to be ignored and the applicable Canadian standards or codes applied.
3. The reducer must be field supplied for 100, 125, 150 and 175 MBH unit sizes.
4. If using a metal vent system under positive gauge pressure in Canada, a slip fit vent connection must be secured by at least two corrosion-
resistant screws, or other mechanical locking means.
5. The vent shall not terminate – (a) Less than 6 ft. (1.8m) from a combustion air inlet of another appliance. (b) Less than 3 ft. (1m) from any
other building opening or any gas service regulator. (c) Directly above a gas utility meter or service regulator.
Use single wall pipe constructed of 26 gauge galvanized
steel or material or equivalent durability and corrosion
resistance for the vent system. For installation in
Canada, vent pipe must conform with local building
codes, or in absence of local codes, with current CSA
B149.1/B149.2 installation codes for gas burning
appliancesand equipment.
Never use a pipe of a diameter
other than that specified in Table 1 or Figure
2! Never use PVC or other nonmetallic pipe for
venting!To do so may result in serious damage
to the unit or severe personal injury or death!
The vent terminal must be installed with a minimum
clearance of four feet (1.2m) from electric meters, gas
meters, regulators and relief equipment.
Seal ALL vent pipe joints and seams to prevent
leakage. Use General Electric RTV-108 or Dow-
Corning RTV-732 silicone sealant (or equivalent); or 3M
#425 aluminum foil tape (or equivalent).
The vent system must be installed to prevent collection
of condensate.Vertical vent pipes should be equipped
with condensate drains. Pitch horizontal pipes
downward 1/4 inch per foot (21mm per meter) toward
outlet for condensate drainage (refer to Figures 9
through 16).
Horizontal portions of the venting system shall be
supported at maximum intervals of four feet (1.2m)
to prevent sagging (in Canada, support at 3 feet (1m)
minimum intervals).
Insulate single wall vent pipe exposed to cold air or
running through unheated areas.
Each unit must have an individual vent pipe and
vent terminal per furnace section! Each unit MUST
NOT be connected to other vent systems or to a
chimney.
Units are shipped from the factory set up for vertical
venting.To convert the power venter for horizontal
venting, remove the shipping support bracket; refer to
Figures 9 thru 12 and 22, and follow this procedure:
1. Hold power venter motor in position.
2. Remove the three Phillips-head screws from the
motor adaptor plate.
3. Remove the three screws which connect the
power venter stack to the power venter housing.
4. Rotate the power venter housing to the horizontal
position.
5. Replace screws accordingly.
NOTICE:The motor, pressure switch, and junction
box bracket MUST remain located as shipped from
the factory. Rotate only the blower housing! If the
power venter housing is to be moved to the right
horizontal position,the junction box must be rotated
90 degrees CCW to clear the connection.To do this,
remove all wires, conduit and conduit connector
from the junction box,noting location of wires.Move
box, using holes provided. Move 7/8 inch plug from
bottom of box to side.Reconnect all wires according
to the unit's wiring diagram.

14
Figure 13
Figure 14

15
Figure 15
Figure 16

16
OPERATION
POWER VENTED BLOWER UNITS
INTERMITTENT (SPARK) PILOT IGNITION
EXPLANATION OF CONTROLS:
1. The unit heater is equipped with a dual automatic
gas valve and electric ignition device (separate from
the gas valve on most models) which provide the
following functions:
a. The unit heater is equipped with a power vent
system consisting of a power venter motor
and blower, pressure switch, and sealed flue
collector in place of the conventional draft
diverter.
The addition of external draft hoods
or power venters is not permitted. Addition of such
devices may cause severe unit malfunction or
failure!
b. The power venter motor is energized by the
room thermostat on a call for heat.The pressure
switch measures the flow through the vent
system and energizes the indirect spark ignition
system when the flow is correct.
The pressure switch MUST
NOT be bypassed.The unit MUST NOT be fired
unless the power venter is operating. An unsafe
condition could result.
c. The indirect spark ignition system consists of
an ignition control module, a dual combination
gas valve, and a spark-ignited pilot burner.
When the pressure switch closes, the pilot
valve opens and a spark is generated to light
the pilot burner.When the flame sensing circuit
senses that pilot flame is established, the main
gas valve is opened to supply gas to the main
burners.When the thermostat is satisfied, the
vent system is de-energized and both valves
are closed to stop all flow of gas to the unit.
d. Pilot solenoid valve also functions as a main gas
valve to provide redundancy.
e. Pressure regulator provides proper and steady
gas pressure to the main burners.
f. Manual shutoff valve for service and long term
shut-down. (Separate from the automatic valve
on some models.)
2. The limit switch interrupts the flow of electric current
to the main gas valve in case the heater becomes
overheated.
3. The fan switch delays the operation of the fan until
the heater is warmed, then keeps the fan running
after the gas has been turned off until the useful
heat has been removed. The start-up fan delay
must not exceed 90 seconds from a cold start.
4. The wall thermostat (supplied optionally) is a
temperature sensitive switch which operates the
vent system and ignition system; it turns the main
gas valve ON or OFF to control the temperature
of the space being heated. It must be mounted
on a vibration free, vertical surface away from
air currents, in accordance with the instructions
furnished with the thermostat (also refer to
Electrical Section).
START-UP
1. Open the manual valve supplying gas to the unit
heater, and with the union connection loose, purge
air from the gas line. Tighten the union and check
for gas leaks, using a soapy water solution only.
Never useanopenflametodetect
gas leaks. Explosive conditions may exist which
could result in personal injury or death.
Before attempting to light or
relight pilot, wait 5 minutes to allow gas which
may have accumulated in the burner compart-
ment to escape. Failure to do so could cause
the accumulated gas to ignite rapidly, leading to
personal injury or death.
2. Open the manual valve on the unit heater.
3. Turn ON electrical power.
4. The unit should be under the control of the
thermostat.Turn the thermostat to the highest point
and determine that the power venter motor starts
and the pilot and main burners ignite. Turn the
thermostat to the lowest point and determine that
the power venter motor shuts off and pilot and main
burners are extinguished.
5. If pilot adjustment is required, remove the pilot
adjustment seal cap and adjust the pilot screw to
obtain proper flame. Clockwise rotation decreases
pilot flame size. Replace the cap.
6. Turn the thermostat to the desired position.
7. Refer to “Adjustments” section for more specifi-
cations.
SHUT DOWN
1. Turn the valve selector knob to the “OFF” position.
2. Turn off the electricity.
3. To relight, follow the “start-up” instructions.
See Figure 17 for parts/identification.

17
10
11
7
12
SPARK
1
M
V
2
MV/PV
34
GND
(BURNER)
P
V
567
8
9
24V
(GND
)
24V
TH-W
(OPT.)
Honeywell
WARNING
S8600M
CONTINUOUS RE-TRY
100% SHUTOFF IP
90SEC. TRIAL FORIGNITION
9
6
BURNER DRAWER COMMON PARTS:
1. MAIN BURNERS
2. BURNER MANIFOLD
3. AIR SHUTTERS
4. BURNER SPRINGS
5. MAIN BURNER ORIFICE
6. TRANSFORMER
7. PILOT TUBING
CONTROLS: (REFER TO UNIT WIRING DIAGRAM)
8A. MAIN GAS VALVE (HONEYWELL)
8B. MAIN GAS VALVE (WHITE RODGERS)
9. HONEYWELL IGNITOR
10. HONEYWELL PILOT BURNER
11. HONEYWELL PILOT ORIFICE
12. HONEYWELL ELECTRODE/SENSOR LEAD
13. HI-LIMIT SWITCH
(LOCATED ON REAR HEADER PLATE
OF THE HEAT EXCHANGER; AIR INLET SIDE).
Figure 17 - Burner Components Intermittent Pilot Ignition
1
2
O
F
F
8A
O
N
8B
1
3
54
13

3. The adjusted manifold pressure should not vary
more than 10% from the pressure specified in
Table 7.
Table 7 - Main Burner Orifice Schedule*
PRIMARY AIR SHUTTER ADJUSTMENT
After the unit has been operating for at least 15
minutes, adjust the primary air flow to the burners.
Turn the friction-locked, manually-rotated air shutters
clockwise to close, or counterclockwise to open.
For correct air adjustment, close the air shutter until
yellow tips in the flame appear. Then open the air
shutter to the point just beyond the position where
yellow tipping disappears. Refer to Figure 18.
NOTICE:There may be momentary and spasmodic
orange flashes in the flame.This is caused by the
burning of airborne dust particles, and not to be
confused with the yellow tipping, which is a stable
or permanent situation when there is insufficient
primary air.
Figure 18 - Main Burner Flames
18
GAS INPUT RATE
Check the gas input rate as follows. To calculate
metric units, refer to general safety section for metric
conversions/SI units):
Never overfire the unit heater, as
this may cause unsatisfactory operation or shorten
the life of the heater.
the life of the heater.
1. Turn off all gas appliances that use gas through the
same meter as the unit heater.
2. Turn gas ON to the unit heater.
3. Clock the time in seconds required to burn one
cubic foot of gas by checking the gas meter.
4. Insert the time required to burn one cubic foot of
gas into the following formula and compute the
input rate.
3600 (Sec. Per Hr.) x Btu/Cu. Ft
= Input Rate
Time (Sec.)
For example, assume the Btu content of one cubic foot
of gas equalled 1000 and that it takes 18 seconds to
burn one cubic foot of gas.
3600 x 1000
= 200,000 Btu/Hr.
18
NOTICE: If the computation exceeds or is less
than 95 percent of the gas Btu/hr. input rating (see
Specifications), adjust the gas pressure.
Adjust the gas pressure as follows:
1. NATURAL GAS: Best results are obtained when
the unit heater is operating at its full input rating with
the manifold pressure of 3.5 inches W.C.(0.9 kPa).
Adjustment of the pressure regulator is not normally
necessary since it is preset at the factory. However,
field adjustment may be made as follows:
a. Attach manometer at pressure tap plug adjacent
to control outlet.
b. Remove regulator adjustment screw cap,
located on combination gas valve.
c. With a small screwdriver, rotate the adjustment
screw counterclockwise to decrease or clock-
wise to increase pressure.
Do not force beyond stop limits.
d. Replace regulator adjustment screw cap.
2. PROPANE GAS:An exact manifold pressure of 10.0
inchesW.C.(2.5 kPa) must be maintained for proper
operation of the unit heater. If the unit is equipped
with a pressure regulator on the combination gas
valve, follow steps “a” through “d” above. If the unit
is not so equipped, the propane gas supply system
pressure must be regulated to attain this manifold
operating pressure.
*
INPUT
IN
1000
BTU
2500 BTU/Ft3
(93.1 MJ/m3)
PROPANETYPE OF GAS NATURAL
HEATING VALUE 1075 BTU/Ft3
(40.1 MJ/m3)
3.5" W.C.
(0.9 kPA) 10" W.C.
(2.5 kPA)
NO. OF
BURNER
ORIFICES
MANIFOLD
PRESSURE
4
5
6
7
8
9
10
12
14
16
100
125
150
175
200
225
250
300
350
400
FT 3/HR
ORIFICE DRILL
FT 3/HR
ORIFICE DRILL
FT 3/HR
ORIFICE DRILL
FT 3/HR
ORIFICE DRILL
FT 3/HR
ORIFICE DRILL
FT 3/HR
ORIFICE DRILL
FT 3/HR
ORIFICE DRILL
FT 3/HR
ORIFICE DRILL
FT 3/HR
ORIFICE DRILL
FT 3/HR
ORIFICE DRILL
96
42
120
42
140
42
163
42
186
42
210
42
233
42
280
42
326
42
372
42
40
54
50
54
60
54
70
54
80
54
90
54
100
54
120
54
140
54
160
54
*This schedule is for units operating at normal altitudes of 2000 ft.(610m) or
less.For operation at elevations above 2000 feet (610m), input ratings must
bereducedattherateof4percentfor each 1000 feet(305m)above sea level.
SPECIALORIFICES AREREQUIREDFORINSTALLATIONS ABOVE2000
FEET (610M).
Wheninstalled in Canada, anyreferencestoderationat altitudesinexcess of
2000 feet (610m) are to be ignored.At altitudes of 2000 to 4500 feet (610 to
1372m),theunitheatersmustbeorificed to 90% of the normal altitude rating,
and be so marked in accordance with the ETL certification.
NORMAL
(HARD FLAME)
LIFTING
TOO MUCH AIR)
YELLOW TIPPING
(MARGINAL)
YELLOW FLAME
(TOO LITTLE AIR)

19
MAINTENANCE
3. To clean or replace the main burners, remove the
bottom panel and compress the spring by moving
the burner toward the manifold. Slide the opposite
end of the burner downward from the locating slot
while retaining spring is still compressed. Pull the
burners away from the heater.
4. With the burners removed, gently wire brush the
inside surfaces of the heat exchanger.
5. Remove any dirt, dust, or other foreign matter from
the burners using a wire brush and/or compressed
air. Ensure that all parts are unobstructed. Inspect
and clean pilot burner if necessary.
6. Reassemble the gas unit heater by replacing all
parts in reverse order.
7. Complete the appropriate unit start-up procedure
as given in the “Operation” section of this manual
(see lighting instruction plate on the unit).
8. Check the burner adjustment. See the “Primary Air
Shutter Adjustment” section of this manual.
9. Check all gas control valves and pipe connections
for leaks.
10. Check the operation of the automatic gas valve and
the power venter assembly by lowering the setting
of the thermostat, stopping the operation of the
gas unit heater.The gas valve should close tightly,
completely extinguishing the flame on the main
burners.
11. Inspect and service the motor/fan assembly. To
maintain efficient air flow, inspect and clean the
fan blades and guard to prevent buildup of foreign
matter.
12. Check lubrication instructions on the motor. If oiling
is required, add 3 to 4 drops of electric motor oil as
follows:
a. Light Duty - After 3 years or 25,000 hours of
operation.
b. Average Duty - Annually after 3 years or 8,000
hours of operation.
c. Heavy Duty - Annually after 1 year or at least
every 1500 hours of operation.
Never over oil the motor or premature
failure may occur!
13. Check and test the operational functions of all
safety devices supplied with your unit.
PILOT ADJUSTMENT
1. Remove the pilot adjustment cap.
2. Adjust the pilot screw to provide a properly sized
flame.
3. A proper pilot flame is a soft steady flame that
envelopes 3/8 to 1/2 inch (9.5 to 12.7mm) of the
flame sensor tip.
4. Replace the pilot adjustment cap.
PERIODIC SERVICE
NOTICE: It is recommended that the heater and
vent system be checked once a year by a qualified
serviceman.
All Maintenance/Service info should be recorded
accordingly on the Inspection Sheet provided in this
manual.
Open all disconnect switches
and disconnect all electrical and gas supplies
and secure in that position before servicing
unit. Failure to do so may result in personal
injury or death from electrical shock.
Gas tightness of the safety shut-
off valves must be checked on at least an annual
basis.
To checkgastightnessofthesafetyshut-offvalves, turnoff
the manual valve upstream of the appliance combination
control. Remove the 1/8 inch pipe plug on the inlet side
of the combination control and connect a manometer to
that tapping.Turn the manual valve on to apply pressure
to the combination control.Note the pressure reading on
themanometer, then turn the valveoff.Aloss of pressure
indicates a leak.If a leak is detected, use a soap solution
to check all threaded connections. If no leak is found,
combinationcontrol isfaultyand mustbereplaced before
putting appliance back in service.
Should maintenance be required, perform the following
inspection and service routine:
1. Inspect the area near the unit to be sure that
there is no combustible material located within the
minimum clearance requirements listed in this
manual.
Under no circumstances should
combustible material be located within the
clearances specified in this manual. Failure
to provide proper clearance could result in
personal injury or equipment damage from fire.
2. Turn OFF the manual gas valve and electrical
power to the gas unit heater.
MANIFOLD PRESSURE ADJUSTMENT
If the manifold pressure requires minor adjustment,
remove the cap from the pressure regulator and turn
the adjustment screw clockwise to increase the
pressure, or counterclockwise to decrease the
pressure.The adjusted manifold pressure should not
vary more than 10% from the pressures specified in
Table 4.

1. Pressure regulator set too high.
2. Defective Regulator.
3. Burner orifice too large.
1. Excessive primary air.
2. Burner orifice too small.
1. Too much primary air.
2. Noisy pilot.
3. Irregular orifice causing whistle or
resonance.
4. Excessive gas input.
a. Pressure regulator set too high.
b. Defective regulator.
c. Burner orifice too large.
1. Insufficient primary air.
2. Clogged main burner ports.
3. Misaligned orifices.
4. Clogged flue collector.
5. Air shutter linted.
6. Insufficient combustion air.
1. Blocked venting.
2. Insufficient combustion air.
3. Blocked heat exchanger.
4. Air leak into combustion chamber or
flue collector.
1. Shut off gas supply immediately!
2. Blocked heat exchanger/venting.
3. Drafts around heater.
4. Negative pressure in building.
5. Blocked flue collector.
1. Excessive primary air.
2. Main burner ports clogged near pilot.
3. Pressure regulator set too low.
4. Pilot decreases in size when main
burners come on.
5. Pilot flame too small.
6. Drafts around heater.
7. Improper venting.
1. Main gas off.
2. Lack of power at unit.
3. Thermostat not calling for heat.
4. Defective limit switch.
5. Improper thermostat or transformer wiring
at gas valve.
6. Defective gas valve.
7. Defective thermostat.
8. Defective transformer.
20
A.Flame lifting from burner ports.
B. Flame pops back.
C.Noisy flame.
D. Yellow tip flame (some yellow
tipping on propane gas is
permissible).
E.Floating flame.
F. Gas Odor.
G. Delayed ignition.
H.Failure to ignite.
1. Reset manifold pressure. Refer to
“Operation”.
2. Replace regulator section of combination
gas valve or complete valve.
3. Check with local gas supplier for proper
orifice size and replace.Refer to “Operation”.
1.
Close air shutter. Refer to “Operation”.
2. Check with local gas supplier for proper
orifice size and replace.Refer to “Operation”.
1. Close air shutter.
2. Reduce pilot gas.Refer to “Operation”.
3. Replace orifice.
4.
a. Reset manifold pressure.
b. Refer to “Operation”;Replace regulator
section of combination gas valve or
complete valve.
c. Check with local gas supplier for proper
orifice size and replace.
Refer to “Operation”.
1. Open air shutters.Refer to “Operation”.
2. Clean main burner ports.
3. Replace manifold assembly.
4. Clean flue collector.
5. Check for dust or lint at air mixer opening
and around the air shutter.
6. Clean combustion air inlet openings in
bottom panel, see “Installation”.
1. Clean flue. Refer to “Installation”.
2. Clean combustion air inlet openings in
bottom panel, see “Installation”.
3. Clean heat exchanger.
4. Determine cause and repair accordingly.
1. Inspect all gas piping and repair.
2. Clean heat exchanger/flue.
3. Eliminate drafts. Refer to “Installation”.
4. See “Installation”.
5. Clean flue collector.
1. Close air shutter. Refer to “Operation".
2. Clean main burner ports.
3. Reset manifold pressure. Refer to
“Operation”.
4. Supply piping is inadequately sized.
Refer to “Installation”.
5. Clean pilot orifice. Refer to “Operation”.
6. Eliminate drafts. Refer to “Installation”.
7. Refer to “Installation”.
1. Open all manual gas valves.
2. Replace fuse or turn on power supply.
3. Turn up thermostat.
4. Check limit switch with continuity tester. If
open, replace limit switch.
5. Check wiring per diagrams.
6. Replace gas valve.
7. Check thermostat and replace if defective.
8. Be sure 115 volts is supplied to the trans-
former primary, then check for 24 volts at
secondary terminal before replacing.
SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION
Table 8 - PowerVented BlowersTroubleshooting Guide