Trane GHND-SVX01A-EN User Manual
Installation Operation
Maintenance
High Efficiency Propeller Fan Gas Unit Heater
GHND
GHPD
July 2007 GHND-SVX01A-EN
Preface and Warnings and Cautions
Literature Change History: GHND-SVX01A-EN (May 2007)
Note: One copy of this document ships inside the control panel of each unit and is
customer property. It must be retained by the unit’s maintenance personnel.
This booklet describes proper installation, operation, and maintenance procedures for
the high efficiency propeller fan gas unit heater. By carefully reviewing the information
within this manual and following the instructions, the risk of improper operation and/
or component damage will be minimized.
It is important that periodic maintenance be performed to help assure trouble free
operation. Should equipment failure occur, contact a qualified service organization
with qualified, experienced HVAC technicians to properly diagnose and repair this
equipment.
Note: All phases of this installation must comply with the NATIONAL, STATE & LOCAL
CODES. In addition to local codes, the installation must conform with National
Electric Code -ANSI/NFPA NO. 70 LATEST REVISION.
Warnings and Cautions. Notice that warnings and cautions appear at appropriate
intervals throughout this manual. Warnings are provided to alert installing contractors
to potential hazards that could result in personal injury or death, while cautions are
designed to alert personnel to conditions that could result in equipment damage.
Your personal safety and the proper operation of this machine depend upon the strict
observance of these precautions.
WARNING: Indicates a potentially hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation which, if not avoided, may
result in minor or moderate injury. It may also be used to alert against unsafe
practices.
CAUTION: Indicates a situation that may result in equipment or property-damage
only accidents.
© 2007 American Standard Inc. All rights reserved GHND-SVX01A-EN
Contents
Model Number Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
General Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Clearances: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Gas Supply Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Pipe Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pipe Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Thermostat Wiring and Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Venting for Power Vented Unit Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Periodic Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Trouble Shooting Guide: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Part Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Gas Equipment Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
GHND-SVX01A-EN 3
Model Number Description
Trane products are identified by a multiple character model number that precisely
identifies a particular type of unit. An explanation of the alphanumeric model number is
shown below. It will enable the owner of Service Engineer to define operation,
components and accessories.
Model
NumberGHND010ADC1000E+
Digit
number 1 2 3 4 5,6,7 8 9 10 11 12 13 14 15
DIGIT 1 — Gas heating equipment
DIGIT 2 — Unit type
B = High efficiency centrifugal fan unit heater
c = Centrifugal fan unit heater
D = Indoor duct furnace
E = Centrifugal fan unit heater with enclosure
H = High efficiency propeller fan unit heater
P = Propeller fan unit heater
L = High efficiency indoor duct furnace
DIGIT 3 — Fuel
N = Natural gas
P= LP gas (propane)
DIGIT 4 — Development sequence
D = Fourth generation
DIGITS 5, 6, 7 — Input capacity single furnace
003 = 30 Mbh 017 = 175 MBh
004 = 45 Mbh 020 = 200 Mbh
005 = 50 Mbh 022 = 225 Mbh
006 = 60 Mbh 025 = 250 Mbh
007 = 75 Mbh 030 = 300 Mbh
010 = 100 Mbh 035 = 350 Mbh
012 = 125 Mbh 040 = 400 Mbh
015 = 150 Mbh
DIGIT 8 — Main power supply
A = 115/60/1
B = 230/60/1
C = 208/60/30
D = 230/60/3
E = 460/60/3
4 GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater
DIGIT 9 — Gas control option
A = Single stage, standing pilot
D = Single stage, intermittent pilot ignition
E = Two stage, intemittent pilot ignition
H = Electric model w/ room thermostat, intermittent pilot ignition
J = Electric model w/ duct thermostat, intermittent pilot ignition
L = Electric model w/ external 4-20 mA input
N = Electric model w/ external 0-10 vbc input
T = Single stage direct spark ignition
DIGIT 10 — Design sequence
F = Sixth design
Digit 11 — Exchanger material
1 = Aluminized steel
2 = # 409 stainless steel
3 = # 321 stainless steel
DIGIT 12 — Rooftop arrangements
Model Number Description
0 = None (indoor unit)
DIGIT 13 — Rooftop heating unit motor selection
0= None (indoor unit and rooftop duct furnace)
DIGIT 14 — Rooftop fan selection
0 = None (indoor unit and rooftop duct furnace)
DIGIT 15 — Miscellaneous options all units
0= None
A = # 409 stainless steel burners
B = Orifices for elavation above 2000 feet (specify elevation)
Centrifugal fan unit heater (std. w/ and w/out enclosure or high efficiency)
C = # 409 stainless steel draft diverter
D = Summer-Winter switch
E = Vertical Louvers
H = Duct discharge flange
J = Totally enclosed motor
Propeller fan unit heater (std. or high efficiency)
C = # 409 stainless steel draft diverter
D = Summer-Winter switch
E = Vertical louvers
Duct Furnace (indoor) std. or high efficiency
C = # 409 stainless steel draft diverter
D = Summer-Winter switch
F = Horizontal louvers
G = Horizontal and vertical louvers
K = Side access burner drawer
L = Fan time delay control
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 5
Description
General Information
The High Efficiency Propeller Fan Gas Unit Heater is a factory assembled, power vented,
low static pressure type propeller fan heater designed to be suspended within the space
to be heated.THESE HEATERS ARE NOT TO BE CONNECTED TO DUCTWORK. The
designs are certified by CSA International 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. Front view, High Efficiency Propeller Fan Gas Unit Heater
Figure 2. Rear view, High Efficiency Propeller Fan Gas Unit Heaters
6 GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater
General Safety Information
General Safety Information
WARNIN G
Hazardous Service Procedures!
The maintenance and troubleshooting procedures recommended in this section of the manual
could result in exposure to electrical, mechanical or other potential safety hazards. Always refer
to the safety warnings provided throughout this manual concerning these procedures. When
possible, disconnect all electrical power including remote disconnect and discharge all energy
storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized. When necessary to work with live electrical
components, have a qualified licensed electrician or other individual who has been trained in
handling live electrical components perform these tasks. Failure to follow all of the
recommended safety warnings provided, could result in death or serious injury.
Note: IMPORTANT! 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., 11 West 42nd Street, New York, NY, 10036 or 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 NFPA No. 88A and NFPA No. 88B.
General Information
If installed in Canada, the installation must conform with local building codes, or in
absence of local building codes, with CGA-B149.1 “Installation Codes for Natural Gas
Burning Appliances and Equipment” or
CGA-B149.2 “Installation Codes for Propane Gas Burning Appliances and Equipment”.
These Unit Heaters have been designed and certified to comply with CGA 2.6. Also see
sections on installation in AIRCRAFT HANGARS and PUBLIC GARAGES.
WARNIN G
Altering Unit!
Do not alter the unit heater. Failure to follow instructions could result in death or serious injury.
WARNIN G
Hazardous Voltage and Gas!
Turn off the gas supply and disconnect all electric power, including remote disconnects before
servicing unit. Follow proper lockout/tagout procedures to ensure the power can not be
inadvertently energized. Failure to turn off gas or disconnect power before servicing could result
in death or serious injury.
Follow installation instructions CAREFULLY to avoid creating unsafe conditions. All
external wiring must conform to applicable current local codes, and to the latest edition
of the National Electric Code ANSI/NFPA No. 70. In Canada, all external wiring must
conform to the Canadian Electric Code, Part 1 CSA Standard C22.1. 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
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 7
General Information
this manual. Also follow procedures listed on the “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 the risk of gas leaks, carbon
monoxide poisoning and explosion.
Note: IMPORTANT! Do not attempt to convert the heater for use with a fuel other than
Make certain that the power source conforms to the electrical requirements of the
heater.
WARNIN G
Ground Wire!
All field-installed wiring must be completed by qualified personnel. All field-installed wiring must
comply with NEC and applicable local codes. Failure to follow this instruction could result in
death or serious injuries.
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 qualified electrician.
General Safety Information
the one intended.
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 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 backup
system or a temperature sensitive alarm should be used.
WARNIN G
Flammable Vapors!
When connecting to existing gas lines be sure to valve off the gas supply ahead of connection
point. To avoid explosion or possible fire, always purge all residual gas from piping before cutting
into existing line or removing threaded fittings. Failure to remove all gas vapors could result in
death or serious injury or equipment or property-only-damage.
8 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
General Information
Unit Size 30 45 60 75 100 125 150 175 200 225 250 300 350 400
PERFORMANCE DATA ‡
Input BTU/Hr 30,000 45,000 60,000 75,000 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000
Output BTU/Hr 24,000 36,000 48,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000 200,000 240,000 280,000 320,000
Thermal Efficiency (%) 80 80 80 80 80 80 80 80 80 80 80 80 80 80
Free Air Delivery CFM 750 800 1,050 1,100 1,480 1,650 2,200 2,530 2,640 2,700 3,100 4,400 5,000 5,300
Air Temperature Rise
Deg. F
Outlet Velocity FPM 680 720 610 640 775 910 1,045 1,070 1,010 950 980 1,100 1,150 1,050
Full Load Amps at 115V 4.5 4.5 4.5 4.5 5.8 6 7.2 8.2 8.2 8.2 8.2 11.2 13.2 13.2
MOTOR DATA : Motor
HP
Motor Type SP SP SP SP SP SP PSC PSC PSC PSC PSC PSC PSC PSC
R.P.M. 1,050 1,050 1,050 1,050 1,050 1,050 1,140 1,140 1,140 1,140 1,140 1,140 1,140 1,140
Amps @ 115V 1.3 1.3 1.3 1.3 2.6 2.8 4 4.5 4.5 4.5 4.5 8 9 9
DIMENSIONAL DATA in.
“A” Height to Top of
Unit
“B” Width of Unit 14 14 17-1/2 17-1/2 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
“C” Height to Top of
Hanger
“D” Depth to Rear of
Housing
“E” Hanging Distance
Width
“F” Discharge Opening
Width
“G” Depth to Unit Side
Jacket
“H” Discharge Opening
Height
“J” to Centerline of
Flue
“K” Depth to Centerline
of Flue
“L” Hanger Location 13-3/4 13-3/4 13-1/2 13-1/2 16-1/4 16-3/4 16-3/8 16-3/8 16-3/8 16-3/4 16-3/4 16-3/4 16-3/4 16-3/4
Flue Size Dia.-in.* 4 4 4 4 4 4 4 4 5 5 5 6 6 6
Fan Diameter-in. 12 12 14 14 14 16 16 18 18 18 18 (2) 16 (2) 18 (2) 18
Gas Inlet-Natural Gas-
in.
Gas Inlet-LP Gas-in. 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 or 3/4
Approx. Shipping Wt
lb.
30 42 42 50 50 56 50 51 56 61 60 50 52 56
1/30 1/30 1/30 1/30 1/20 1/10 1/4 1/3 1/3 1/3 1/3 1/4 1/3 1/3
25-3/4 25-3/4 25-3/4 25-3/4 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
27-1/2 27-1/2 27-1/2 27-1/2 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
30-3/8 30-3/8 30-3/8 30-3/8 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2
11 11 16-1/2 16-1/2 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
10 10 15-1/2 15-1/2 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
19-3/8 19-3/8 19-3/8 19-3/8 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4
16-1/4 16-1/4 16-1/4 16-1/4 18 18 18 18 18 18 18 18 18 18
4 4 5-3/4 5-3/4 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
23-5/8 23-5/8 23-5/8 23-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8
1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
79 94 109 119 174 197 219 238 249 275 305 350 414 461
Note 1. ‡Ratings shown are for unit installations at elevations between 0 and 2,000 ft. For unit installations in U.S.A. above
2,000 ft. (610m), the unit input must be derated 4% for each 1,000 ft. (305m) above sea level; refer to local codes,
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 9
General Information
Figure 3. Dimensions standard units
10 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Installation
Do not install unit heaters in corrosive or flammable atmospheres! Premature failure
of, or severe damage to the unit will result!
Note: IMPORTANT!
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
Figure 4. Heater location
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 11
Installation
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 (3.1m)
above the upper surface of wings or engine enclosures of the highest aircraft to be
stored in the hangar and 8 feet (2.4m) 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.
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 ft. (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 CGA-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
12 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Installation
impede the warm air distribution patterns. Heat throw distances are presented in Table
2, and Figure 2A.
Figure 5. Heat throw distances
Unit
Heater
“H”
Floor Line
Table 2. Standard applications, heat throw distances (approximate)
"H"
30,000 45,000 60,000 75,000 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000
833333340 60 65 70 75 80 85 90105110120
10 28 28 28 35 54 56 60 64 68 72 78 90 95 100
12 NR NR NR NR 44 46 49 57 61 65 68 80 84 90
15 NR NR NR NR NR NR 45 49 52 56 60 70 74 80
20 NR NR NR NR NR NR NR NR 46 50 54 63 66 70
Note 2. NR=Not recommended
H=Distance from floor to bottomof the unit.
UNIT SIZE
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 byproduct) 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.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 13
Installation
Clearances:
Note: Unit heater sizing should be based on heat loss calculations where the unit
heater output equals or exceeds heat loss. Heater output is approximately 80%
of input BTU/HR. rating.
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 (457mm). A minimum
clearance of 6 inches (152mm) 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 (152mm). Also see AIR
FOR COMBUSTION and VENTING sections.
Note: Increasing the clearance distances may be necessary if there is a possibility of
distortion or discoloration of adjacent materials.
Note:
IMPORTANT! Make certain that the lifting methods used to lift the heater and
the method of suspension used in the field installation of the heater are capable
of uniformly supporting the weight of the heater at all times.
Make certain that the structure to which the heater is mounted is capable of 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.
Unit heaters must be hung level from side to side and from front to back. 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 job. Refer to figures 1-5 and dimensional data per table 1 for
suspension of units.
14 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Figure 6. Heater Mounting
Note 3. All hanging hardware and wood is not included with the unit (to be field supplied).
Installation
Figure 7. Heater mounting 30/400 MBTU Unit Sizes
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 15
Pipe Sizing
Gas Supply Piping
WARNING
Flammable Vapors!
When connecting to existing gas lines be sure to valve off the gas supply ahead of connection
point. To avoid explosion or possible fire, always purge all residual gas from piping before cutting
into existing line or removing threaded fittings. Failure to remove all gas vapors could result in
death or serious injury or equipment or property-only-damage.
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:
Cu ft/hr = Input
Btu per Cu ft
2. Refer to Table 1. 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 1, a 1 inch pipe is needed.
Note: See General Safety Information section for English/SI (metric) unit conversion
factors.
Note: If more than one gas unit heater is to be served by the same piping arrangement,
the total cubic feet per hour input and length of pipe must be considered.
Note: If the gas unit heater is to be fired with LP gas, see Table 3 or consult the local LP
gas dealer for pipe size information.
WARNING
Hazard of Explosion and Fire!
Heater installation for use with propane (LP-gas) must be made by a qualified LP-Gas Dealer or
LP-Gas Installer to ensure all appropriate codes, installation procedures, and precautions have
been followed. Failure to follow these instructions could result in death or serious injury.
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.
16 GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater
Gas Pipe Size
Table 3.
Gas Supply Piping
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,
Nominal
Iron Internal
Pipe
Size Dia. 10 20 30 40 50 60 70 80 90 100 125 150 175 200
1/2 0.622 175 120 97 82 73 66 61 57 53 50 44 40 37 35
3/4 0.824 360 250 200 170 151 138 125 118 110 103 93 84 77 72
1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135
1 1/4 1.38 1400 950 770 660 580 530 490 460 430 400 360 325 300 280
1 1/2 1.61 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430
2 2.067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800
2 1/2 2.469 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280
3 3.068 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280
4 4.026 23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 6000 5500 5000 4600
and a Pressure Drop of 0.5 Inch Water Column (124.4 Pa)(Based on a 0.60 Specific Gravity Gas)
Length of Pipe, Feet
Notes: 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 units input (kW) by 0.0965 to determine
Cubic Meters / Hour.
Notes: FOR NATURAL GAS: Select the pipe size directly from the table.
Notes: FOR PROPANE GAS: Multiply the Cu. Ft. / Hr. (Cubic Meters per Ho ur) value by 0.633; then use the table.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 17
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