INSTALLATION INSTRUCTIONS & PARTS LIST
POWER VENTED GAS FIRED BLOWER UNIT HEATERS
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 THESE AGREE WITH THOSE AT POINT
OF INSTALLATION. RECORD THE UNIT MODEL AND SERIAL No.(s) IN THE SPACE PROVIDED. RETAIN FOR
FUTURE REFERENCE.
IIEB-11
J30-05390
Model No.
Serial No.
FOR Y OUR SAFETY
The use and storage of gasoline or other fl ammable v apors and liquids in open containers in
the vicinity of this appliance is hazardous.
R
T
E
E
K
T
N
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FOR Y OUR SAFETY
If you smell gas:
1. Open windows.
2. Don’t touch electrical switches.
3. Extinguish any open fl ame.
V
D
E
E
R
I
I
F
ENERGY
PERFORMANCE
CM
VERIFIED
RENDEMENT
ENERGETIQUE
VERIFIE
4. Immediately call your gas supplier.
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
APPROVED FOR USE IN CALIFORNIA
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.
08/12
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, dur ing 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.
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 an y 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: (413) 568-9571 FAX: (413) 562-8437
www.mestek.com
TABLE OF CONTENTS
SPECIFICATIONS
Basic Description ....................................................2
Performance & Specifi cation 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
DESCRIPTION
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
ELECTRICAL CONNECTIONS ................................11
VENTING .................................................12, 13, 14, 15
OPERATION
Spark Ignition ..................................................16, 17
Main Burner Orifi ce 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
and discharge nozzles for spot heating. These blower
type unit heaters may be used where low sound levels
ar e r e q ui r e d. 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.
Figure 1 - Power Vented Blower Unit Heaters
Front
View
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:
See Identifi cation of Parts Section
for unit components.
Rear
View
Indicates an imminently hazardous
situation which, if not av oided, 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 hazards.
2
GENERAL SAFETY INFORMATION
Failure to comply with the general
safety information may result in extensive
property damage, severe personal injury or death.
This pr oduct must be installed b y
a licensed plumber or gas fi tter 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
Standards are available from the National 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
accordance with NFP A No . 88A and NFP A No . 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
Gas Burning Appliances and Equipment" or CSA-B149.2
“Installation Codes for Propane Gas Burning Appliances
and Equipment”. These Unit Heaters hav e been designed
and certifi ed to comply with CSA 2.6. Also see sections
on installation in AIRCRAFT HANGARS and PUBLIC
GARAGES.
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
grounding means must be tested by a qualifi ed electrician.
Do not insert fi ngers 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
to cause injury .
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 leaktested by a suitably qualifi ed individual, per instructions
in this manual. Also follow procedures listed on the “Gas
Equipment Start-Up Sheet” located in this manual.
This heater is intended for general heating applications
ONLY. It must NOT be used in potentially dangerous
locations such as fl ammable, 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
purged shall not discharge into areas where there are
sources of ignition or into confi ned 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 m ust be
taken to perform this operation in a safe manner!
Unless otherwise specifi ed, the following conversions
may be used for calculating SI unit measurements:
1 foot = 0.305 m
1 inch = 25.4 mm
1 psig = 6.894 kPa
1 pound = 0.453 kg
1 gallon = 3.785 L
1 cubic foot = 0.028 m
1 inch water column = 0.249 kPa
1000 Btu/Cu. Ft. = 37.5 MJ/m
3
1000 Btu per hour = 0.293 kW
liter/second = CFM x 0.472
meter/second = FPM ÷ 196.8
3
3
T able 1 – Perf ormance and Dimensional Data – Power V ented Blower Unit Heater
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 Effi ciency (%) 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)
‡ 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 certifi cation.
LEGEND:
SPH = SPLIT PHASE
CAP. START = CAPACITOR START
Figure 2 Unit
Dimensions
DIMENSIONS .XXX STANDARD UNITS
DIMENSIONS IN PARENTHESIS (XXX) MILLIMETERS
4
INSTALLATION
Do not install unit heaters in
corrosive or fl ammable atmospheres! Premature
failure of, or severe dama ge 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.
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 fl oor, measured
to the bottom of the unit. At heights above 8 feet (2.4m),
less effi cient 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 fl oor in shops,
offi ces 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.
PUBLIC GARAGES: In repair garages, unit heaters
must be at least 8 feet (2.4m) above the fl oor. Refer to
the latest edition of NFPA No. 88B, Repair Garages.
In parking structures, unit heaters must be installed
so that the burner fl ames are located a minimum of 18
inches (457mm) above the fl oor 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 fl oor 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 fl ows 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 - Heat Throw Distances
Table 2 - Standard Applications - Heat Throw Distances (Approximate)
“H”
Distance From
Floor to Bottom
of Unit
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)
NR = Not recommended
UNIT SIZE BTU/Hr (kW)
5
INSTALLATION (continued)
The installation is to be adjusted to obtain an air
throughput within the range specifi ed 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 fl ue gases are cooled inside
the heat exchanger to a point where water vapor (a fl ue
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 confi ned space. When buildings are so tight
that normal infi ltration 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.
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*
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.
*All hanging hardware and wood is not included with the unit
(To be fi eld supplied).
Figure 5 - Heater Mounting 100/400 MBTU Sizes
Unit Sizes
6
INSTALLATION – GAS SUPPLY PIPING/SIZING
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 fi re 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.
PIPE SIZING
To provide adequate gas pressure at the gas unit
heater, size the gas piping as follows:
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.
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” fi gure. This
fi gure 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) natur al 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: If the gas unit heater is to be fi red 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 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 HEATER; AND THAT IT IS PROPERLY
CONNECTED TO PROPANE GAS SUPPLY SYSTEM.
Before any connection is made to an existing line
supplying other gas appliances, contact the local gas
NOTICE: See General Safety Information section for
english/SI (metric) unit conversion factors.
company to make certain that the existing line is of
adequate size to handle the combined load.
Table 3 - Gas Pipe Size
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 Specifi c 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)
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.
7
PIPE INSTALLATION
D3631C
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, accessib le 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 exter nal to the
jacket. See Figure 6.
8. Make certain that all connections have been
adequately doped and tightened.
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 fl ame to detect
gas leaks. Explosive conditions may e xist 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).
CAUTION: Do not over tighten 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.
Table 4 - Gas Piping Requirements*
Gas Type
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.
8
INSTALLATION (continued)
BLOWER SET UP
BLOWER DRIVE ADJUSTMENT
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 fl ow or pressure requirements, the drive ratio must
be altered by means of the adjustable sheave on the
belt without fi rst disconnecting all electrical
power to the unit or severe personal injury may
result!
Never attempt to adjust the drive
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
defl ection 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.
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 specifi ed in the BLOWER
SET UP section under step 2.
5. Replace the belt guard.
5. Measure the current draw of the motor.
Never operate the unit without
The "at speed" current draw of the
motor must never exceed that specified on the
the belt guard in place or severe personal injury
may result!
motor rating plate or severe damage to the motor
will 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).
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
Never operate the unit beyond
the specified limits or severe damage to, and or
premature failure of, the unit 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.
9
Table 5 - Motor Data
H.P.
VOLTAGE
PH
RPM
SHAFT
FRAME
STARTER
SIZE
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 specifi ed).
4. Motor frame must not exceed NEMA frame 56.
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
1
3
1
3
1
3
1
3
3
3
1725
1725
1725
1725
1725
1725
1725
1725
1725
1725
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
56
56
56
56
56
56
56
56
56
56
0/00
Table 6 - Motor Full Load Amps*
VOLTAGE – PHASE
H.P.
1/2
3/4
1
1-1/2
2
3
115-1
9.8
13.8
16.0
—
—
—
208-1
5.4
7.6
8.4
10.5
12.6
17.8
*Average value, all speeds and frequencies.
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
—
00
—
00
—
00
—
00
0
Table 7 - Pulley Table 1725 RPM Motors (1/3 to 3 H.P.)
MOTOR PULLEYS
IVL34
1.9-2.9
IVL44
2.8-3.8
AK51
4.7
AK56
5.2
Turns Open
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
697
734
771
807
844
880
918
954
991
1027
1064
1101
1137
1174
1211
1247
1284
1321
1357
1394
630
663
697
730
763
796
829
863
896
928
962
995
1028
1061
1094
1127
1161
1194
1227
1260
BLOWER PULLEYS
AL64
6.0
546
575
603
633
661
690
719
748
776
805
834
863
891
920
949
978
1006
1035
1064
1093
AL74
7.0
468
493
517
542
567
591
616
641
665
690
715
739
764
789
813
838
863
887
912
936
AL84
8.0
410
431
453
474
496
517
539
560
582
604
625
647
668
690
712
733
755
776
798
819
AL104
10.0
327
345
362
380
397
414
431
448
466
483
500
518
535
552
569
587
604
621
638
656
10
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