Mestek Tubular 30 Datasheet

GG-IOM-10
J30-08511
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, 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 problem that may be found.
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.
Unit No. Serial No.
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 CERTAIN THAT THESEAGREE WITH THOSE AT THE POINT OF INSTALLATION. RECORD THE
UNIT MODEL AND SERIAL No.(s) IN THE SPACE PROVIDED. RETAIN FOR FUTURE REFERENCE.
INSTALLATION INSTRUCTIONS AND PARTS IDENTIFICATION
TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS
– FOR COMMERCIAL, INDUSTRIAL AND RESIDENTIAL INSTALLATIONS –
01/14
APPROVED FOR USE IN CALIFORNIA
Install, operate, and maintain unit in accordance with the 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 instruction thoroughly before installing or servicing this equipment.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electrical switch; do
not use any phone in your building.
Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
If you cannot reach your gas supplier,
call your fire department.
ENERGY
PERFORMANCE
VERIFIED
RENDEMENT
ENERGETIQUE
VERIFIE
CM
V
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F
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K
260 NORTH ELM ST., WESTFIELD, MA 01085
TEL: [phone] FAX: [phone]
www.mestek.com

2
TABLE OF CONTENTS
The following terms are used throughout this manual, in addition to the ETL requirements to bring attention to the
presence of potential hazards, or to important information concerning the product:
Indicates an imminently hazardous
situation which, if not avoided, will result in
death, serious injury, or substantial property
damage.
Indicates an imminently hazardous
situation which, if not avoided, could result in
death, serious injury, or substantial property
damage.
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.
SPECIFICATIONS
Basic Description .................................................... 2
Performance & Specification Data ...................... 4, 5
GENERAL SAFETY INFORMATION
Installation Codes ............................................... 2, 3
Special Precautions ............................................2, 3
INSTALLATION
Locating Units .....................................................6, 7
Combustion Air ................................................... 6, 7
Proper Clearances .............................................. 6, 7
Suspension of Units ............................................ 6, 7
Gas Supply Piping .............................................. 8, 9
ELECTRICAL CONNECTIONS ............................10-15
VENTING
General.............................................................16-17
Standard Combustion ......................................18-24
Separated Combustion ....................................24-27
OPERATION .............................................................. 28
GAS INPUT RATE ......................................................29
MAINTENANCE
Servicing & Cleaning ............................................30
TROUBLESHOOTING GUIDE .............................31-35
IDENTIFICATION OF PARTS ...............................36-37
WARRANTY ............................................................... 38
UNIT NUMBER DESCRIPTION ................................ 39
INSPECTION SHEET................................................. 40
See Identification of Parts, Figures 22 through 28.
DESCRIPTION
The Tubular Gas Fired Unit Heater is a factory
assembled, power vented, low static pressure type
propeller fan unit heater designed to be suspended
within the space to be heated. THESE HEATERS ARE
NOT TO BE CONNECTED TO DUCTWORK. These
Tubular Unit Heaters are design certified under ANSI
NOTICE: It is the equipment owners responsibility to provide any scaffolding or other apparatus required to
perform emergency service or annual/periodic maintenance to this equipment.
Z83.8 for Industrial/Commercial use and IAS .10.96 U.S.
(2nd ed.) “Unit Heaters for Residential Installation”. The
designs are certified by ETL as providing a minimum
of 82% 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.
Figure 1 - Tubular 30 thru 120 Propeller Unit Heaters
120 MBH 30 MBH

3
GENERAL SAFETY INFORMATION
Failure to comply with the general
safety information may result in extensive
property damage, severe personal injury, 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 CSA Information
Services 1-800-463-6727. The NFPA Standards are
available from the National Fire Protection Association,
Batterymarch Park, Quincy, MA 02269.
If installed in Canada, the installation must conform with
local building codes, or in the absence of local building
codes, with 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.” These unit heaters have been designed
and certified to comply with CSA 2.6.
Do not alter the unit heater in
any way or damage to the unit and/or severe
personal 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 “Gas
Equipment Start-Up Sheet” located in this manual.
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 risk of gas leaks,
carbon monoxide poisoning, and explosion.
Conversion to a fuel other than
that listed on the rating plate is permitted
only with a factory supplied, ETL approved
conversion kit.
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 ground conductor between the service panel
and the heater.To ensure a proper ground, the grounding
means must be tested by a qualified electrician.
Do not insert fingers or foreign objects into 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 maybe hot enough
to cause 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.
Do not attach ductwork to this product or use it as a
makeup air heater. Such usage voids the warranty and
will create unsafe operation.
In cases in which property damage may result from
malfunction of the heater, a back-up system or
temperature sensitive alarm should be used.
Should overheating occur, or the gas supply fail to shut
off, shut off the manual gas valve to the appliance before
shutting off the electrical supply.
The open end of piping systems
being purged shall not discharge into areas where
there are sources of ignition or into confined spaces
UNLESS precautions are taken as follows: (1) by
ventilation of the space, (2) control of the 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:
1 foot = 0.305 m
1 inch = 25.4 mm
1 gallon = 3.785 L
1 pound = 0.453 kg
1 psig = 6.894 kPa
1 cubic foot = 0.028m3
1000 BTU/cu. ft. = 37.5 MJ/m3
1000 BTU per hour = 0.293 kW
1 inch water column = 0.249 kPa
liter/second = CFM x 0.472
meters/second = FPM ÷ 196.8

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Table 1 - Performance and Dimensional Data - Tubular 30 thru 120 Propeller Unit Heater
Unit Size 30 45 60 75 90 105 120
PERFORMANCE DATA†
Input - BTU/Hr. 30,000 45,000 60,000 75,000 90,000 105,000 120,000
(kW) (8.8) (13.2) (17.6) (22.0) (26.4) (30.8) (35.2)
Output - BTU/Hr. 24,900 37,350 49,800 61,500 73,800 86,100 98,400
(kW) (7.2) (10.9) (14.5) (18.0) (21.6) (25.2) (28.8)
Thermal Efficiency (%) 83 83 83 82 82 82 82
Free Air Delivery - CFM 370 550 740 920 1,100 1,300 1,475
(cu. m/s) (.175) (.260) (.349) (.434) (.519) (.614) (.696)
Air Temperature Rise - °F 60 60 60 60 60 60 60
(°C) (15) (15) (15) (15) (15) (15) (15)
Full Load Amps at 120V 3.0 3.0 4.1 4.1 6.4 6.4 6.4
Maximum Circuit Ampacity 3.5 3.5 4.8 4.8 7.5 7.5 7.5
MOTOR DATA: Motor HP 1/20 1/20 1/12 1/12 1/10 1/10 1/10
Motor (kW) (0.04) (0.04) (0.06) (0.06) (0.075) (0.075) (0.075)
Motor Type SP SP SP SP SP SP SP
RPM 1650 1650 1050 1050 1050 1050 1050
Motor Amps @ 115V 1.9 1.9 2.6 2.6 4.2 4.2 4.2
DIMENSIONAL DATA - inches (mm)
“A” Jacket Height 12-3/8 12-3/8 15-7/8 15-7/8 22-5/8 22-5/8 22-5/8
(314) (314) (403) (403) (574) (574) (574)
“B” Overall Height 13-1/4 13-1/4 16-13/16 16-13/16 23-9/16 23-9/16 23-9/16
(337) (337) (427) (427) (598) (598) (598)
“C” Overall Depth 25-7/8 25-7/8 26-3/16 26-3/16 26-3/8 26-3/8 26-3/8
(632) (632) (665) (665) (670) (670) (670)
“D1” Center Line Height of Flue* 8-1/2 8-1/2 10-3/8 10-3/8 13-5/8 13-5/8 13-5/8
(216) (216) (263) (263) (346) (346) (346)
“D2” Center Line Height of Air Intake 8-1/2 8-1/2 8 8 8-5/8 8-5/8 8-5/8
(216) (216) (203) (203) (219) (219) (219)
“E” Fan Diameter 10 10 14 14 16 16 16
(254) (254) (356) (356) (406) (406) (406)
“F” Discharge Opening Height 10-13/16 10-13/16 14-7/16 14-7/16 21-3/16 21-3/16 21-3/16
(275) (275) (367) (367) (538) (538) (538)
“G” Flue Vent Connection Diameter (Min.) 4 4 4 4 4 4 4
(102) (102) (102) (102) (102) (102) (102)
“H1” Center Line of Flue Connection From Side 7-1/4 7-1/4 7-1/4 7-1/4 7-3/4 7-3/4 7-3/4
(184) (184) (184) (184) (197) (197) (197)
“H2” Center Line of Air Intake From Side 2-3/4 2-3/4 2-3/4 2-3/4 3-1/2 3-1/2 3-1/2
(70) (70) (70) (70) (89) (89) (89)
Vent Size Requirements - Standard Combustion
Category III Horizontal 4 4 4 4 4 4 4
(102) (102) (102) (102) (102) (102) (102)
Category I & III Vertical 4 4 4 4 4 4 4
(102) (102) (102) (102) (102) (102) (102)
Vent Size Requirements - Separated Combustion
Exhaust Diameter 4 4 4 4 5 5 5
(102) (102) (102) (102) (127) (127) (127)
Intake Air Diameter 4 4 4 4 5 5 5
(102) (102) (102) (102) (127) (127) (127)
Unit Weight - lbs. 60 65 80 85 95 105 110
(kgs) (27) (29) (36) (39) (43) (48) (50)
Shipping Weight - lbs. 70 75 90 95 110 115 120
(kgs) (32) (34) (41) (43) (50) (52) (54)
* For all installations, the flue collar is included with the unit and should be field installed per the instructions included with the unit.
† Ratings shown are for unit installations at elevations between 0 and 2,000 feet (0 to 610m). For unit installations in U.S.A. above 2,000 feet (610m), the unit input
must be derated 4% for each 1,000 feet (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 (NFPA No. 54), (also refer to Table 7).
For installations in Canada, any reference to deration at altitudes in excess of 2,000 feet (610m) are to be ignored. At altitudes of 2,000 feet to 4,500 feet (610 to
1372m), the unit must be derated and be so marked in accordance with the ETL certification. See Table 7 for USA and Canadian field deration information.

5
Figure 2 - Dimensional Drawing – Tubular 30 thru 120 Propeller Unit Heater
DIMENSIONS .XXX STANDARD UNITS
DIMENSIONS IN PARENTHESIS (XXX) MILLIMETERS
D8597

6
INSTALLATION
Do not install unit heaters in
corrosive or flammable atmospheres! Premature
failure of, or severe damage to the 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, the unit heater must be installed such that the
gas ignition control system is not directly exposed to
water spray, rain or dripping water.
NOTICE: Location of unit heaters is related directly
to the selection of sizes. Basic rules are as follows:
MOUNTING HEIGHT: If the unit heater is installed in a
garage, it must be installed with a minimum clearance
above the floor of 18 inches (457mm).
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.
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.
Should overheating occur, or the gas
supply fail to shut off, shut off the manual gas valve
to the appliance before shutting off the electrical
supply.
Do not use this appliance if any part
has been under water. Immediately call a qualified
service technician to inspect the appliance and
replace any gas control which has been underwater.
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 air 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 (NFPA
54) 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 vertical walls and the vertical sides of the Unit
Heater shall be no less than 1 inch (25.4mm). However,
to ensure access to the control box and fan, a minimum
of 18 inches (457mm) is required for the fan, and control
box side. A minimum clearance of 1 inch (25.4mm) must
be maintained between the top of the Unit Heater and
the ceiling. The bottom of the Unit Heater must be no
less than 1 inch (25.4mm) from any combustible. The
distance between the flue collector and any combustible
must be no less than 1 inch (25.4mm). 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.
MOUNTING: The Unit Heater may be mounted with the
vent outlet, gas and electrical connections to the right or
left of the air moving fan. The Unit Heater is shipped with
the connections to the right of the fan when looking in
the direction of the air flow. If connections to the right are
required, remove hanger brackets from face of unit and
attach as pictured in Figure 3. If connections to the left
are required, invert the heater (180°), mount the hanging
brackets as above, and remove, invert, and replace the
control access panel and the air discharge louvers.

7
INSTALLATION (continued)
The Unit Heater may be mounted by
fastening the hanging brackets directly to
ceiling joists or by suspending from four
rods. See Figures 3, 4 and 5.
Make certain that
the lifting methods used to lift the
heater and the method of suspen-
sion used in the field installation of
the heater are capable of uniformly
supporting the weight of the heater
at all times. Failure to heed this
warning may result in property
damage or personal injury!
Make sure that the
structure to which the unit heater
is to be mounted is capable of
safely supporting its weight.
Under no circumstances must the
gas lines, the venting system or
the electrical conduit be used to
support the heater; or should any
other objects (i.e. ladder, person)
lean against the heater gas lines,
venting system or the 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 3, 4 and 5.
Failure to do so will result in poor
performance and/or premature failure
of the unit.
Ensure that all
hardware used in the suspension
of each unit heater is more than
adequate for the job. Failure to
do so may result in extensive
property damage, severe personal
injury, or death!
Refer to Figures 3, 4 and 5 for
suspension of units.
Figure 5 - Heater Mounting (Wood Construction)
Figure 3 - Hanger Bracket Installation Instructions
Figure 4 - Heater Mounting (Steel Construction)
D8499
D8598
D8599

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GAS PIPING
To avoid 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 a shut-off valve to isolate the unit while conducting gas pressure/leak
tests. These valves may not be completely shut off, exposing the gas valve to excessive pressure and
damage.
NOTICE: Propane tank must be properly sized for
outdoor temperature and BTU requirement. (See
NFPA 58)
NOTICE: If more than one 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 your local LP gas dealer for pipe size
information.
NOTICE: HEATER INSTALLATION FOR USE WITH
PROPANE (BOTTLED) GAS MUST BE MADE BY A
QUALIFIED L.P. GAS DEALER OR INSTALLER. HE
WILL ENSURE THAT PROPER JOINT COMPOUNDS
ARE USED FOR MAKING PIPE CONNECTIONS;
THAT AIR IS PURGED FROM LINES; THAT A
THOROUGH TEST IS MADE FOR LEAKS BEFORE
OPERATING THE HEATER; AND THAT IT IS
PROPERLY CONNECTED TO THE PROPANE GAS
SUPPLY SYSTEM.
Before any connection is made to the existing line
supplying other gas appliances, contact the local
gas company to make sure that the existing line is of
adequate size to handle the combined load.
1. Determine the required Cu. Feet/Hr. by dividing the input by 1000. For SI/Metric measurements: Convert BTU/Hr. to kilowatts. Multiply the
units inputs (kW) by 0.0965 to determine Cu. Meters./Hr. 2. FOR NATURAL GAS: Select pipe size directly from the table. 3. FOR PROPANE
GAS: Multiply the Cu. Feet/Hr. value by 0.633; then, use the table. 4. Refer to the metric conversion factors listed in the General Safety section
for SI Unit measurement conversions.
Table 2 - Gas Pipe Size
PIPE SIZING
To provide adequate gas pressure to the gas unit heater,
size the gas piping as follows:
1. Find the cu. ft./hr. by using the following formula:
Input
Cu. feet/hr. = BTU
2. Refer to Table 2. Match “Length of Pipe in Feet” with
appropriate “Gas Input - Cu. Feet/Hr.” figure. This
figure can then be matched to the pipe size at the
top of the column.
Example:
It is determined that a 67 foot (20.4m) run of gas
pipe is required to connect a 75 MBTU gas unit
heater to a 1,000 BTU/cu feet (0.29kW) natural gas
supply.
75,000 BTU/Hr
1,000 BTU/cu. feet = 75 Cu. feet/hr.
Using Table 2, a 3/4 inch pipe is needed.
NOTE: See General Safety Information section for
English/Metric unit conversion factors.
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 Diameter 10 20 30 40 50 60 70 80 90 100 125 150 175 200
Inch Inch (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)

9
Do not over tighten the inlet gas
piping into the valve. This may cause stresses that
will crack the valve!
NOTICE: Use pipe joint sealant resistant to the
action of liquefied petroleum gases regardless of
gas conducted.
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
may 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 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).
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 gas supply capable of supplying
its full rated capacity as specified in Table 3. A field
LP tank regulator must be used to limit the supply
pressure to a 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 (NFPA 54)
National Fuel Gas Code; in Canada, according to
CSA-B149. See Tables 1 & 2 for correct gas piping
size, and also refer to Tables 3, 6 and 7. 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 Unit Heaters are supplied with a
combination valve which includes:
a. Manual “A” valve
b. Manual “B” valve
c. Solenoid valve
d. Pressure regulator
Pipe directly into the combination valve (see Figure
6).
6. Gas valve has a pressure test post requiring a
3/32 inch hex head wrench to read gas supply and
manifold pressures. Open 1/4 turn counterclockwise
to read, turn clockwise to close and reseat. A 5/16
inch ID hose fits the pressure post.
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
shutoff valve must be located external to the jacket.
(See Figure 6)
8. Make certain that all connections have been
adequately doped and tightened.
Table 3 - Gas Piping Requirements
GAS PIPING REQUIREMENTS*
GasType Natural Gas Propane (LP) Gas
Manifold 3.5 inch WC 10.0 inch WC
Pressure (0.9 kPa) (2.5 kPa)
14.0 inch WC Max. 14.0 inch WC Max.
Supply Inlet (3.5 kPa) (3.5 kPa)
Pressure 5.0 inch WC Min. 11.0 inch WC Min.
(1.2 kPa) (2.7 kPa)
*For single stage application only at altitudes below 2,001 feet.
D3631C
D3631C

10
HAZARDOUS VOLTAGE!
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 of the transformer should be checked
before energizing the unit heater electrical system. All
external wiring must conform to the latest edition of
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 terminals to check for power. Use
a voltmeter.
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 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 Electrical Code, ANSI/NFPA
No. 70, or CSA Standard C22.1. Refer to Figures 7, 8,
9, 10A, 10B, 10C, 11A, 11B and 11C.
ELECTRICAL CONNECTIONS
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 (1.5m) 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 the operation of the
control.
3. Dead Areas- Areas where the air cannot circulate
freely, such as behind doors or in corners.
NOTICE: The start-up fan delay should not exceed
30 seconds from a cold start.
IMPORTANT: For all wiring connections, refer to the
wiring diagram shipped with your unit (either affixed
to the side jacket or enclosed in the installation
instructions 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.
Figure 9 - T834H or T834N
Thermostat Wiring
Figure 7 - Low-voltage Thermostat Wiring
Single Stage
R G W1 W2
WR
G
D6922C
Figure 8 - Low Voltage Thermostat Wiring
Two Stage
D4788
D8541 D6922C

11
ELECTRICAL CONNECTIONS (continued)
Figure 11A - Honeywell Control Board
Figure 10A - UT Control Board
D8604
D8605

12
ELECTRICAL CONNECTIONS (continued)
Figure 10B -Tubular Propeller Units 30-120 with Natural and Propane (LP) Gas
with Single Stage Gas Control and UT Control Board
NOTICE: See Figures 7, 8, 9, 10B, 10C, 11B
and 11C for connecting the thermostat to the
unit heater. If using a standard low voltage
thermostat with a sub-base switch for fan
control,connect the G terminal of the thermostat
to the G terminal of the unit heater.

13
Figure 10C -Tubular Propeller Units 60-120 with Natural and Propane (LP) Gas
with OptionalTwo Stage Gas Control and UT Control Board
ELECTRICAL CONNECTIONS (continued)
NOTICE: See Figures 7, 8, 9, 10B, 10C, 11B
and 11C for connecting the thermostat to the
unit heater. If using a standard low voltage
thermostat with a sub-base switch for fan
control,connect the G terminal of the thermostat
to the G terminal of the unit heater.

14
ELECTRICAL CONNECTIONS (continued)
Figure 11B -Tubular Propeller Units 30-120 with Natural and Propane (LP) Gas
with Single Stage Gas Control and Honeywell Control Board
NOTICE: See Figures 7, 8, 9, 10B, 10C, 11B
and 11C for connecting the thermostat to the
unit heater. If using a standard low voltage
thermostat with a sub-base switch for fan
control,connect the G terminal of the thermostat
to the G terminal of the unit heater.

15
Figure 11C -Tubular Propeller Units 60-120 with Natural and Propane (LP) Gas
with OptionalTwo Stage Gas Control and Honeywell Control Board
ELECTRICAL CONNECTIONS (continued)
NOTICE: See Figures 7, 8, 9, 10B, 10C, 11B
and 11C for connecting the thermostat to the
unit heater. If using a standard low voltage
thermostat with a sub-base switch for fan
control,connect the G terminal of the thermostat
to the G terminal of the unit heater.

16
VENTING*
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 (NFPA 54), or applicable provisions of local
building codes. All venting of residential tubular unit heaters must comply with CSA International Requirements
10.96 U.S. for Unit Heaters for Residential Use (2nd Edition). Refer to notes* below for Canadian installations. Refer
to Figures 12-17.
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 flue-like symptoms).
When an existing heater is removed or replaced in
venting system, the venting system may not be properly
sized to vent the attached appliances. An improperly
sized vent system can cause formulation of condensate
or leakage or spillage of flue gases.
The following steps shall be followed with each appliance
connected to the venting system placed in operation,
while any other appliances connected to the venting
system are not in operation:
1. Seal any unused openings in the venting system;
2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel
Gas Code, ANSI Z223.1 (NFPA 54) and these
instructions. Determine that there is no blockage or
restriction, leakage, corrosion and other deficiencies,
which could cause an unsafe condition.
3. In so far as practical, close all building doors and
windows and all doors between the space in which
the appliance(s) connected to the venting system
are located and other spaces of the building. Turn on
clothes dryers and any exhaust fans, such as range
hoods and bathroom exhausts, so they shall operate
at maximum speed. Do not operate a summer
exhaust fan. Close fireplace damper.
4. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
that the appliance will operate continuously.
5. After it has been determined that each appliance
connected to the venting system properly vents
when tested as outline above, return doors, windows,
exhaust fans, fireplace dampers, and any other gas-
burning appliance to their previous condition of use.
6. If improper venting is observed during any of the
above tests, the venting system must be corrected
immediately so that the system conforms with the
National Fuel Gas Code, ANSI Z223.1 (NFPA 54).
When resizing any portion of the venting system, the
venting system should be resized to approach the
minimum size as determined using the appropriate
tables in Appendix G of the National Fuel Gas Code,
ANSI Z223.1 (NFPA 54).
The unit heater shall be connected to a factory built
chimney or vent complying with a recognized standard,
or a masonry or concrete chimney lined with a lining
material acceptable to the authority having jurisdiction.
Venting into an unlined masonry chimney is
prohibited.
ADDITIONAL REQUIREMENTS FOR CANADIAN INSTALLATIONS
*The following instructions apply to Canadian installations in addition to installation and operating instructions.
1. Installation must conform with local building codes, or in the 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 reference to U.S. standards or codes in these instructions are to be ignored and the applicable Canadian
standards or codes applied.

17
VENTING - GENERAL GUIDELINES
Venting Categories
Non
Condensing Condensing
Negative
Vent I II
Pressure
Positive
Vent III IV
Pressure
The following guidelines apply to all categories to follow.
Table 4
Do not damper or add heat recovery devices to the flue
piping. Failure to open such a damper prior to operating
the gas unit heater will result in the spillage of flue gas
into the occupied space.
Avoid installing units in areas under negative pressure.
When required, a flue vent fan should be installed in
accordance with the instructions included with the fan.
Vent connectors serving Category Iand Category
II heaters shall not be connected into any portion of
mechanical draft systems operating under positive vent
pressure.
Maintain clearance between the vent pipe and combustible
materials according to vent pipe manufacturer’s
instructions.
ANSI now organizes vented appliances into four
categories.
Category I
Includes non-condensing appliances with negative vent
pressure, like the traditional atmospheric unit heater.
Category II
Groups condensing appliances with negative vent
pressure.
Category III
Appliances are non-condensing and operate with a
positive vent pressure.
Category IV
Covers condensing appliances with positive vent
pressure.
NOTICE: Category II and IV do not apply to equip-
ment specified within this manual.
Vent Systems
Termination Clearance Requirements
Structure/Object
Minimum Clearance
for Termination Locations
USA CANADA
Door, window, or gravity vent
inlet; combustion air inlet for
other appliances
9 inches for 10,000
to 50,000 BTU/Hr
input; 12 inches for
input exceeding
50,000 BTU/Hr.
9 inches (230mm)
for 10,000 to 50,000
BTU/Hr input; 12
inches (305mm)
for input exceeding
50,000 BTU/Hr.
Forced air inlet within 10 ft. 3 feet above 6 feet (1.8m)
Adjoining Building or parapet 10 feet 10 feet (3.04m)
Adjacent public walkways 7 feet above
grade
7 feet (2.1m) above
grade
Electric, gas meters
& regulators 4 feet horizontal
3 feet (0.9m)
horizontally from
meter/regulator
asembly. 6 feet
(1.8m), any direction,
from a gas service
regulator vent outlet
Above grade level* 1 feet 1 feet (0.3m)
*Minimum above maximum snow depth, or per local code, whichever is
greater.

18
STANDARD COMBUSTION
VERTICALLY VENTED, CATEGORY I- Figure 12
Observe the following precautions when venting the unit:
1. Use flue pipe of the same size as the flue connection(s)
on the gas unit heater 4 inches (102mm). All heaters
must be vented with a UL 1738 listed, double or single
wall vent, Type B vent, a factory built chimney, or a
lined brick and mortar chimney that has been
constructed in accordance with the National Building
Code. All tables and dimensions assume double wall
for the flue and single wall pipe or double wall for the
connector.
2. A minimum vertical rise of 5 feet (1.5m) is required
for Category I venting. The top of the vent pipe
should extend at least 2 feet (0.61m) above the
highest point on the roof. Consideration should be
made for anticipated snow depth. Install an
Amerivent Americap or Metalbestos vent cap over
the vent opening.
3. Slope horizontal runs upward from the gas unit heater
at least 1/4-inch per foot (21mm/m) minimum.
Horizontal Vent Connector length should not exceed
75% of the vertical height of the vent pipe. Maximum
vent connector length is 10 feet (3m). For exceptions
see Ch. 10 of the National Fuel Gas Code, ANSI
Z223.1 (NFPA 54). Horizontal portions of the venting
system shall be supported at minimum intervals of
4 feet (1.2m) (in Canada, support at 3 foot (1m)
minimum intervals). Maintain clearance between the
vent pipe and combustible materials per vent pipe
manufacturer’s instructions.
4. Use as few elbows as possible.
5. Seal all vent pipe joints and seams to prevent
leakage. Use General Electric RTV-108, Dow-
Corning RTV-732, or equivalent silicone sealant with
a temper ature rating of 500°F, or 3M #425 aluminum
foil tape (or equivalent). See Figure 12A.
6. Avoid running vent pipe through unheated spaces.
When this cannot be avoided, insulate the pipe to
prevent condensation of moisture on the walls of the
pipe. Insulate vent pipe runs longer than 10 ft (3m).
Insulation should be a minimum of 1/2 inch (12.7 mm)
thick foil faced.

19
Figure 12 - Vertically Vented, Category I
Figure 12A - Double Wall Draft Hood Connector
D9257
D06880

20
VERTICALLY VENTED, CATEGORY III – Figures 13B, 15 & 17
Observe the following precautions when venting the unit:
1. Use flue pipe of the same size as the flue connection(s)
on the gas unit heater, 4 inches (102mm). All heaters
must be vented with a UL 1738 listed single or double
wall pipe listed for positive pressure vent systems.
2. Each unit must have an individual vent pipe and
vent terminal. Unit MUST NOT be connected to
other vent systems or to a chimney.
3. Category III units are limited to a maximum of
40 feet (12.19m) equivalent length of vent pipe.
Equivalent length is the total length of straight
sections PLUS 5 feet (1.5m) for each 90 degree
elbow and 2.5 feet (.75m) for each 45 degree elbow.
4. The top of the vent pipe should extend at least 2
feet (0.61m) above the highest point on the roof.
Consideration should be made for anticipated snow
depth. Install an Amerivent Americap or Metalbestos
vent cap over the vent opening. Slope horizontal runs
upward from the gas unit heater at least 1/4-inch
per foot (21mm/m) minimum. Horizontal portions of
the venting system shall be supported at minimum
intervals of 4 feet (1.2m) (in Canada, support at 3
foot (1m) minimum intervals). (See Figures 13B, 15
and 17)
5. Avoid running vent pipe through unheated spaces.
When this cannot be avoided, insulate the pipe to
prevent condensation of moisture on the walls of the
pipe.
STANDARD COMBUSTION
HORIZONTALLY VENTED, CATEGORY III - Figures 13A, 14 & 16
Observe the following precautions when venting the unit:
1. Use flue pipe of the same size as the flue
connection(s) on the gas unit heater, 4 inches
(102mm). All heaters must be vented with a single
or double wall pipe listed for category III positive
pressure vent systems. (UL 1738 listed AL29-4C).
2. Each unit must have an individual vent pipe and
vent terminal. Unit MUST NOT be connected to
other vent systems or to a chimney.
3. Category III units are limited to a maximum of
40 feet (12.19m) equivalent length of vent pipe.
Equivalent length is the total length of straight
sections PLUS 5 feet (1.5m) for each 90 degree
elbow and 2.5 feet (.75m) for each 45 degree elbow.
4. An Amerivent Americap or Metalbestos vent cap
must be supplied by the customer for each power
vented unit. The vent pipe diameter must be 4 inches
(102mm).
5. The vent terminal must be at least 12 inches
(305mm) from the exterior of the wall that
it passes through to prevent degradation of the
building materials by flue gasses.
6. Through the wall venting for these appliances shall
not terminate over public walkways, or over an area
where the condensate or vapor could create a
nuisance, hazard, or could be detrimental to the
operation of regulators, relief valves, or other
equipment. See Figures 13A, 14, 16 and Table 4.
7. Maintain clearance between the vent pipe and
combustible materials according to vent pipe
manufacturer’s instructions.
8. The vent system must be installed to prevent
collection of condensate. Pitch horizontal pipes
downward 1/4 inch per foot (21mm per meter)
toward the outlet for condensate drainage. Install a
tee with a condensate drain at the low point of the
pipe (see Figure 13A). As an alternate, a 3/8 inch
diameter hole may be drilled at the low point of the
pipe for condensate drainage.
9. Horizontal portions of the venting system shall be
supported at minimum intervals of 4 feet (1.2m) to
prevent sagging (in Canada, support at 3 foot (1m)
minimum intervals).
10. Avoid running vent pipe through unheated spaces.
When this cannot be avoided, insulate the pipe to
prevent condensation of moisture on the walls of
the pipe. Insulate vent pipe runs longer than 10 feet
(3m). Insulation should be a minimum of 1/2 inch
(12.7mm) thick foil faced.