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
Gas Supply Piping
Pipe Installation
WARNING
Hazard of Explosion of 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.
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
Pipe Installation
pressure and a gas supply capable of supplying its full rated capacity (refer to Table
4). A field LP tank regulator must be used to limit the supply pressure to maximum
of 14 in. 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
CGA-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. 5.Standard gas duct furnaces, optional two-stage unitsare supplied with a
combination valve which includes:
(a) Manual “A” valve (b) Manual “B” valve
(c) Solenoid valve (d) Pilot safety (e) Pressure regulator
and then pipe directly into combination valve (see Figure 4).
6. A 1/8 in. N.P.T. plugged tapping, accessible for test gauge connection, must be
installed immediately upstream of the gas supply connection to the appliance
7. Provide a drip leg in the gas piping near the gas unit heater. A ground joint union
and a manual gas shutoff valve should be installed ahead of the unit heater controls
to permit servicing. The manual main shutoff valve must be located external to the
jacket. See Figure 1, Pipe installation standard controls.
WARNI NG
Hazard of Explosion!
Never use an open flame to detect gas leaks. Explosive conditions may occur. Use a leak test
solution or other approved methods for leak testing. Failure to follow recommended safe leak
test procedures could result in death or serious injury or equipment or property-only-damage.
8. Make certain that all connections have been adequately doped and tightened.
18 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Pipe Installation
Gas Supply Piping
Note: IMPORTANT! Do not overtighten the inlet gas piping into the valve. This may
cause stresses that would crack the valve!
Note: Use pipe joint sealant resistant to the action of liquefied petroleum gases
regardless of gas conducted.
Figure 8. Pipe installation, standard controls
The appliance and its individual shutoff valve must be disconnected from the gas
supply piping system during any pressure testing of that system at test pressures in
excess of 1/2 psig (3.5 kPa).
The appliance must be isolated from the gas supply piping system by closing its
individual manual shutoff valve during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psig (3.5 kPa).
Table 4. Single stage gas piping requirements
GasType Natural Gas Propane (LP) Gas
Manifold Pressure 3.5 in. W.C. 10.0 in. W.C.
14.0 in. W.C. Max. 14.0 in. W.C. Max.
Supply Inlet Pressure 5.0 in. W.C. Min. 11.0 in W.C. Min.
Notes: For single stage application only at normal altitudes.
Table 5. Two stage gas piping requirements
Gas Type Natural Gas Propane (LP) Gas
Supply Inlet Pressure 6.5 in. W.C. Min. 11.5 in. W.C. Min.
Notes: **For two stage applications only at norm al altitudes; two stage applications do not apply to the 30/75
MBH models.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 19
Electrical Connections
WARNIN G
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
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.
Standard units are shipped for use on 115 volt, 60 hertz single phase electric power.
The motor nameplate and electrical rating on the transformer should be checked before
energizing the unit heater electrical system. All external wiring must conform to the
latest edition of the ANSI/NFPA No. 70, National Electrical Code and applicable current
local codes; in Canada, to the Canadian Electrical Code, Part 1 CSA Standard C22.1.
It is recommended that the electrical power supply to each unit heater be provided by a
separate, fused and permanently live electrical circuit. A disconnect switch of suitable
electrical rating for each unit heater should be located as close to the gas valve and
controls as possible. Each unit heater must be electrically grounded in accordance with
the latest edition of the National Electric Code, ANSI/NFPA No. 70 or CSA Standard
C22.1.
The transformer supplied with this unit heater is internally fused. Any overload or short
circuit will ruin the transformer.
Thermostat Wiring and Location
Note: The thermostat must be mounted on a vertical vibration-free surface free from
air currents and in accordance with the furnished instructions.
Mount the thermostat approximately 5 feet (1.5 m) above the floor in an area where it
will be exposed to a free circulation of average temperature air. Always refer to the
thermostat instructions as well as our unit wiring diagram and wire accordingly. Avoid
mounting the thermostat in the following locations:
1. Cold areas - Outside walls or areas where drafts may affect the operation of the
control.
2. Hot areas - Areas where the sun's rays, radiation, or warm air currents may affect
control operation.
3. Dead areas - Areas where air cannot circulate freely, such as behind doors or in
corners.
20 GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater
Thermostat wiring and location
Thermostat wires tagged “W” and “G” must be connected together except when using
a general purpose "SPDT" 24VAC relay and a standard thermostat with subbase, or
when using low voltage thermostats. Also refer to Figure 9 for other wiring
connections.
Figure 9. Thermostat Wiring
Electrical Connections
THERMOSTAT HEAT ANTICIPATOR ADJUSTMENTS:
The initial heat anticipator setpoint should equal the thermostat's current amperage
draw when the unit is firing. This setpoint should be measured for the best results. Use
the recommended ranges as a guide. If further information is needed, consult your
thermostat manufacturer's instructions.
Recommended Heat Anticipator Setting Ranges:
25 ft. (7.6m) 50 ft. (15.2m)
Gas Ignition Type T'stat Wiring T'stat Wiring
For Power Vented Units: 0.85 to 0.90 A 0.90 to 1.1 A
Intermittent (Spark) Max. Setting on thermostat
FAN TIME DELAY CONTROL
Leads from time delay controls are factory wired to the junction box. The fan control is
a time delay relay (approximately 45 seconds ON, 65 seconds OFF). The fan control is
rated at 17 amps.
Note: The start-up fan delay must not exceed 90 seconds from a cold start.
Note: For all wiring connections, refer to the wiring diagram that your unit is equipped
with (either affixed to the side jacket or enclosed in your unit's installation
instruction envelope). Should any original wire supplied with the heater have to
be replaced, it must be replaced with wiring material having a temperature
rating of at least 105° C.
Should any high limit switch wires have to be replaced, they must be replaced
with wiring material having a temperature rating of 200°C minimum.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 21
Venting for Power Vented Unit Heaters
WARNIN G !
Carbon Monoxide Poisoning!
Each unit must have an individual vent pipe and vent terminal per furnace section!
Each unit MUST NOT be connected to other vent systems or to a chimney. Failure to
follow this instruction could result in death or serious injuries.
All unit heaters must be vented! All venting installations shall be in accordance
with the latest edition of Part 7, venting of Equipment of the National Fuel Gas Code,
ANSI Z223.1, or applicable provisions of local building codes for natural or power
vented units.
Power vented units are designed to be used with single wall vent pipe utilizing
horizontal or vertical venting arrangements (see Figures 6, 7 and 8). These
arrangements may terminate external to the building using either a single wall or
double wall (Type B) vent. See Figures 6 thru 10 for special installation requirements
regarding these venting conditions.
Note: IMPORTANT! Your venting system must not be blocked by any snow, snow
drifts, or any foreign matter. Inspect your venting system to ensure adequate
ventilation exists at all times! Failure to heed these warnings could result in
Carbon Monoxide Poisoning (symptoms include grogginess, lethargy,
inappropriate tiredness, or flu-like symptoms).
Note: Do not use a type B (double wall) vent internally within the building on power
vented units!
If double wall venting is used, components which are UL Listed and approved for
Category III positive pressure venting systems MUST be used.
A Briedart Type L, Field Starkap or an equivalent vent cap must be supplied by the
customer for each power vented unit. The vent pipe diameter MUST be as specified in
the table 1 (“D” Dia. Flue Opening). A reducer must be field installed for 100 through
175 MBH Unit Sizes (Canadian units include this required reducer). All 300 through 400
MBH Unit sizes are factory equipped with the required flue increaser. Refer to Figures 9
through 10D for additional requirements.
Vent Systems - Termination Clearance Requirements
Minimum Clearances for Termination
Structure
Door, window or any gravity air inlet
Forced air inlet within 10 ft. 3 feet above
Adjoining building or parapet 6 feet
Adjacent public walkways 7 feet above grade
Locations
4 feet below
4 feet horizontally
1 foot above
22 GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater
Venting for Power Vented Unit Heaters
The venting system for these appliances shall terminate at least four feet (1.2m) below,
four feet (1.2m) horizontal from, or one foot (0.3m) above any door, window, or gravity
air inlet into any building.
Through the wall vents for these appliances shall NOT terminate over public walkways,
or over an area where condensate or vapor could create a nuisance or hazard or could
be detrimental to the operation of regulators, relief valves, or other equipment.
The vent pipe equivalent length must be 5 ft. (1.5m) minimum and must not exceed 50
ft. (15.2m). Equivalent length is the total length of straight sections PLUS 15 ft. (4.6m)
for each 90 degree elbow, 8 ft. (2.4m) for each 45 degree elbow, and 10 ft. (3.0m) for the
vent cap.
Maintain 6 in. (152mm) between vent pipe and combustible materials. A minimum of 12
in. (305mm) of straight pipe is required from the venter outlet before installing an elbow
in the vent system. An elbow should never be attached directly to the venter!
Figure 10. Horizontal left vent position, (rear view of unit heater)
To Horizontal Flue
V ent T ermina tion
Tee With Drip Leg &
C leanout Cap At Lowest
Point Of Vent System (T yp.)
R educer/Increaser
Where Applicable
Power Venter
D4072
Figure 11. Horizontal right vent position, (rear view of unit heater)
R educer/Increaser
Where Applicable
Power Venter
D4073
To Horizontal Flue
V ent T e rmination
Tee With Drip Leg &
C leanout Cap At Lowes t
Point Of Vent S ystem (Typ.)
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 23
Venting for Power Vented Unit Heaters
Figure 12. Vertical Vent Position (side view of unit heater)
To Vertical Flue
V ent Termina tion
Tee With
Drip Leg &
C lea nout C a p
Power Venter
D4071
Use single wall pipe constructed of 26 gauge galvanized steel or material of equivalent
durability and corrosion resistance for the vent system. For installation in Canada, use
pipe constructed from 0.025 inch thick aluminum or 0.018 inch thick stainless steel.
CAUTION
Equipment Damage!
Never use a pipe of a diameter other than that specified in Table 1! Never use PVC or
other nonmetallic pipe for venting! To do so may result in serious damage to the unit.
R educer/Increaser
Where Applic a ble
AIR FLOW
Any run of single wall vent pipe passing through an unheated space must be insulated
with and insulation suitable to 550°F.
The vent terminal must be installed with a minimum clearance of four feet (1.2m) from
electric meters, gas meters, regulators and relief equipment.
Seal ALL vent pipe joints and seams to prevent leakage. Use General Electric RTV-108 or
Dow-Corning RTV-732 silicone sealant (or equivalent); or 3M #425 aluminum foil tape
(or equivalent).
The vent system must be installed to prevent collection of condensate. Vertical vent
pipes should be equipped with condensate drains. Pitch horizontal pipes downward 1/4
in. per foot (21mm per meter) toward outlet for condensate drainage.
Horizontal portions of the venting system shall be supported at maximum intervals of
four feet (1.2m) to prevent sagging (in Canada, support at 3 feet (1m) minimum
intervals).
Insulate single wall vent pipe exposed to cold air or running through unheated areas.
WARNIN G !
Carbon Monoxide Poisoning!
Each unit must have an individual vent pipe and vent terminal per furnace section!
Each unit MUST NOT be connected to other vent systems or to a chimney. Failure to
follow this instruction could result in death or serious injuries.
Horizontal Venting: Units are shipped from the factory set up for vertical venting.
24 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Venting for Power Vented Unit Heaters
To convert the power venter for horizontal venting, remove the shipping support
bracket; refer to Figures 6 through 10 and 24, and follow this procedure:
1. Hold power venter motor in position.
2. Remove the three Phillips-head screws from the motor adaptor plate.
3. Remove the three screws which connect the power venter stack to the power venter
housing.
4. Rotate the power venter housing to the horizontal position.
5. Replace screws accordingly.
Note: The motor, pressure switch, and junction box bracket MUST remain located as
shipped from the factory. Rotate only the blower housing! If the power venter
housing is to be moved to the right horizontal position, the junction box must be
rotated 90 degrees CCW to clear the connection. To do this, remove all wires,
conduit and conduit connector from the junction box, noting location of wires.
Move box, using holes provided. Move 7/8" plug from bottom of box to side.
Reconnect all wires according to the unit's wiring diagram.
Figure 13. Adaptor installation
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 25
Venting for Power Vented Unit Heaters
Figure 14. Horizontal arrangement, single wall
26 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Venting for Power Vented Unit Heaters
Figure 16. Horizontal arrangement, single wall vent system to double wall termination
Figure 17. Vertical arrangement, single wall vent system to double wall termination
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 27
Operation
POWER VENTED PROPELLER UNITS INTERMITTENT (SPARK) PILOT IGNITION
EXPLANATION OF CONTROLS:
1. The unit heater is equipped with a power venter system consisting of a power
venter motor and blower, pressure switch, and sealed flue collector in place of the
conventional draft diverter.
Note: IMPORTANT! The addition of external draft hoods or power ventors is not
permitted. Addition of such devices may cause severe unit malfunction or
failure!
2. The power venter motor is energized by the room thermostat on a call for heat. The
pressure switch measures the flow through the vent system and energizes the
indirect spark ignition system when the flow is correct.
Note: IMPORTANT! The pressure switch MUST NOT be bypassed. The unit MUST NOT
be fired unless the power ventor is operating.
3. The indirect spark ignition system consists of an ignition control module, a dual
combination valve, and a spark-ignited pilot burner. When the pressure switch
closes, the pilot valves opens and a spark is generated to light the pilot burner.
When flame sensing circuit senses that the pilot flame is established, the main gas
valve is opened to supply gas to the main burners. When the thermostat is satisfied,
the vent system is deenergized and both valves are closed to stop all flow of gas to
the unit.
4. The limit switch interrupts the flow of electric current to the main gas valve in case
the heater becomes overheated.
5. The fan switch delays the operation of the fan until the heater is warmed, then
keeps the fan running after the gas has been turned off until the useful heat has
been removed. The startup fan delay must not exceed 90 seconds from a cold start.
6. The wall thermostat (supplied optionally) is a temperature sensitive switch which
operates the vent system and the ignition system to control the temperature of the
space being heated. It must be mounted on a vibration free, vertical surface away
from air currents, in accordance with the instructions furnished with the thermostat
(also refer to Electrical Section).
28 GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater
Operation
Figure 18. Burner components
BURNER DRAWER COMMON PARTS CONTROLS:
1 Main Burners 8. Main Gas Valve (Honeywell)
2 Burner Manifold 8B. Main Gas Valve (White Rodgers)
3 Air Shutters 9 Ignitor
4 Burner Springs 10 Pilot Burner
5 Main Burner Orifice 11 High Limit, this safety device is located on the rear header
plate of the heat exchanger (air inlet side).
6 Transformer 12 Blocked Vent (Spill) Switch, this safety device is located in
the upper right corner of the right jacket panel.
7 Pilot Tubing
30 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Gas Input Rate
GAS INPUT RATE
Operation
Check the gas input rate as follows (Refer to general safety section for metric
conversions/SI units):
Note:
1. Turn off all gas appliances that use gas through the same meter as the unit heater.
2. Turn gas on to the unit heater.
3. Clock the time in seconds required to burn one cubic foot of gas by checking the gas
4. Insert the time required to burn one cubic foot of gas into the following formula and
3600 (Sec. Per Hr.) x Btu/Cu. Ft = Input Rate
Time (Sec.)
IMPORTANT! Never overfire the unit heater, as this may cause unsatisfactory
operation or shorten the life of the heater.
meter.
compute the input rate.
For example, assume the Btu content of one cubic foot of gas equalled 1000 and that it
takes 18 seconds to burn one cubic foot of gas.
3600 x 1000 = 200,000 Btu/Hr.
18
Note: If the computation exceeds or is less than 95 percent of the gas Btu/hr. input
rating (see Specifications), adjust the gas pressure.
Gas Pressure Adjustments
Adjust the gas pressure as follows:
1. NATURAL GAS: Optimum results are obtained when the unit heater is operating at
its full input rating with the manifold pressure of 3.5 inches W.C. (0.9 kPa).
Adjustment of the pressure regulator is not normally necessary since it is preset at
the factory. However, field adjustment may be made as follows:
a. Attach manometer at pressure tap plug adjacent to the control outlet.
b. Remove regulator adjustment screw cap, located on combination gas valve.
c. With a small screwdriver, rotate the adjustment screw counterclockwise to
decrease or clock- wise to increase pressure. Do not force beyond stop limits.
d. Replace regulator adjustment screw cap.
2. PROPANE GAS: An exact manifold pressure of 10.0 inches W.C. (2.5 kPa)must be
maintained for proper operation of the unit heater. If the unit is equipped with a
pressure regulator on the combination gas valve, follow steps “a” through “d”
above. If the unit is not so equipped, the propane gas supply system pressure must
be regulated to attain this manifold operating pressure.
3. The adjusted manifold pressure should not vary more than 10% from the pressure
specified in the Main burner orifice schedule table.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 31
Operation
Table 6. Main burner orifice schedule
Type of Gas Natural Propane
Heating Value
Input in 1000 BTU
30 FT 3/HR
45 FT 3/HR
60 FT 3/HR
75 FT 3/HR
100 FT 3/HR
125 FT 3/HR
150 FT 3/HR
175 FT 3/HR
200 FT 3/HR
225 FT 3/HR
250 FT 3/HR
300 FT 3/HR
350 FT 3/HR
400 FT 3/HR
Manifold Pressure
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
ORIFICE DRILL
1075 BTU/Ft3
(40.1 MJ/m3)
3.5" W.C.
(0.87kPA)
28
49
42
49
56
49
70
49
96
42
120
42
140
42
163
42
186
42
210
42
233
42
280
42
326
42
372
42
2500 BTU/Ft3
(93.1 MJ/m3)
10" W.C.
(2.49 kPA)
12
57
16
57
24
57
30
57
40
54
50
54
60
54
70
54
80
54
90
54
100
54
120
54
140
54
160
54
Number of
Burner
Orifices
2
3
4
5
4
5
6
7
8
9
10
12
14
16
Notes: This schedule is for units operating at normal altitudes of 2000 ft. (610m) or le ss. SPECIAL ORIFICES ARE
REQUIRED FOR INSTALLATIONS ABOVE 2,000 FT. (610M).
Notes: When installed in Canada, any references to deration at altitudes in excess of 2000 feet (610m) are to be
ignored. At altitudes of 2000 to 4500 feet (610 to 1372m), the unit heaters must be orificed to 90% of
the normal altitude rating, and be so marked in accordance with the CSA certification.
32 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
PRIMARY AIR SHUTTER ADJUSTMENT
After the unit has been operating for at least 15 minutes, adjust the primary air flow to
the burners. Turn the friction-locked, manually-rotated air shutters clockwise to close, or
counterclockwise to open.
Note:
Note: There may be momentary and spasmodic orange flashes in the flame. This is
Figure 19. Main burner flames
IMPORTANT! For correct air adjustment, close the air shutter until yellow tips
in the flame appear. Then open the air shutter to the point just beyond the
position where yellow tipping disappears. Refer to Figure 19, Main burner
flames.
caused by the burning of airborne dust particles, and not to be confused with the
yellow tipping, which is a stable or permanent situation when there is insufficient
primary air.
Operation
NOR MAL
(HAR D FLAME )
YELLOW TIPPING
(MAR GINAL)
PILOT ADJUSTMENT
1. Remove the pilot adjustment cap.
2. Adjust the pilot screw to provide a properly sized flame.
3. A proper pilot flame is a soft steady flame that envelops 3/8 to 1/2-inch (9.5 to 12.7
mm) of the flame sensor.
4. Replace the pilot adjustment cap.
MANIFOLD PRESSURE ADJUSTMENT
If the manifold pressure requires minor adjustment, remove the cap from the pressure
regulator and turn the adjustment screw clockwise to increase the pressure, or
counterclockwise to decrease the pressure. The adjusted manifold pressure should not
vary more than 10% from the pressures specified in Table 5.
LIFTING
(TOO MUCH AIR )
YE LLOW FLAME
(TOO LITTLE AIR)
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 33
WARNING
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.
Periodic Service
Note: The heater and vent system should be checked once a year by a qualified
All Maintenance/Service information should be recorded accordingly on the Inspection
Sheet provided in this manual.
WARNING
Combustible Materials!
Maintain proper clearance between the unit heat exchanger, vent surfaces and combustible
materials. Refer to unit nameplate and installation instructions for proper clearances. Improper
clearances could result in a fire hazard. Failure to maintain proper clearances could result in
death or serious injury or property damage.
Maintenance
technician.
WARNING
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.
Note: IMPORTANT! Gas tightness of the safety shut-off valves must be checked on
at least an annual basis.
To check gas tightness of the safety shut-off valves, turn off the manual valve upstream
of the appliance combination control. Remove the 1/8 inch pipe plug on the inlet side of
the combination control and connect a manometer to that tapping. Turn the manual
valve on to apply pressure to the combination control. Note the pressure reading on the
manometer, then turn the valve off. A loss of pressure indicates a leak. If a leak is
detected, use a soap solution to check all threaded connections. If no leak is found,
combination control is faulty and must be replaced before putting appliance back in
service.
Should maintenance be required, perform the following inspection and service routine:
1. Inspect the area near the unit to be sure that there is no combustible material
located within the minimum clearance requirements listed in this manual.
2. Turn off the manual gas valve and electrical power to the gas unit heater.
34 GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater
Maintenance
3. To clean or replace the main burners, remove the bottom panel and compress the
spring by moving the burner toward the manifold. Slide the opposite end of the
burner downward from the locating slot while retaining spring is still compressed.
Pull the burners away from the heat.
4. With the burners removed, wire brush the inside surfaces of the heat exchanger.
5. Remove any dirt, dust, or other foreign matter from the burners using a wire brush
and/or compressed air. Ensure that all parts are unobstructed. Inspect and clean
pilot burner if necessary.
6. Reassemble the gas unit heater by replacing all parts in reverse order.
7. Complete the appropriate unit start-up procedure as given in the “Operation”
section of this manual (see lighting instruction plate on the unit).
8. Check the burner adjustment. See the “Primary Air Shutter Adjustment” section of
this manual.
9. Check all gas control valves and pipe connections for leaks.
10. Check the operation of the automatic gas valve by lowering the setting of the
thermostat, stopping the operation of the gas unit heater. The gas valve should
close tightly, completely extinguishing the flame on the main burners.
11. Inspect and service the motor/fan assemblies. To maintain efficient air flow, inspect
and clean the fan blades and guard to prevent buildup of foreign matter.
12. Check lubrication instructions on the motor. If oiling is required, add 3 to 4 drops of
electric motor oil as follows:
a. Light Duty - After 3 years or 25,000 hours of operation.
b. Average Duty - Annually after 3 years or 8,000 hours of operation.
c. Heavy Duty - Annually after 1 year or at least every 1500 hours of operation.
CAUTION
Bearing Failure!
Do not mix greases with different bases within the bearing. Mixing grease within the bearing
may result in premature bearing failure.
13. Check and test the operational functions of all safety devices supplied with your
unit.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 35
Trouble Shooting
Trouble Shooting Guide:
A. Flame lifting from burner ports.
POSSIBLE CAUSE(S)
1. Pressure regulator set too high.
2. Defective Regulator.
3. Burner orifice too large.
CORRECTIVE ACTION
• Reset manifold pressure. Refer to "Operation".
• Replace regulator section of combination gas valve or complete valve.
• Check with local gas supplier for proper orifice size and replace. Refer to
“Operation”.
B. Flame pops back.
POSSIBLE CAUSE(S)
C. Noisy flame.
1. Excessive primary air.
2. Burner orifice too small.
CORRECTIVE ACTION
• Close air shutter. Refer to “Operation”.
• Check with local gas supplier for proper orifice size and replace. Refer to
“Operation”.
POSSIBLE CAUSE(S)
1. Too much primary air.
2. Noisy pilot.
3. Irregular orifice causing whistle or resonance.
4. Excessive gas input.
CORRECTIVE ACTION
• Close air shutter.
• Reduce pilot gas. Refer to “Operation”.
• Replace orifice.
36 GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater
• Reset manifold pressure. Refer to “Operation”; Replace regulator section of
combination gas valve or complete valve; or Check with local gas supplier for
proper orifice size and replace. Refer to “Operation”.
D. Yellow tip flame (some yellow tipping on propane gas is permissible).
POSSIBLE CAUSE(S)
1. Insufficient primary air.
2. Clogged main burner ports.
3. Misaligned orifices.
4. Clogged flue collector.
5. Air shutter linted.
6. Insufficient combustion.
CORRECTIVE ACTION
• Open air shutters. Refer to “Operation”.
Trouble Shooting
E. Floating flame.
• Clean main burner ports.
• Replace manifold assembly.
• Clean flue collector.
• Check for dust or lint at air mixer opening and around the air shutter.
• Clean combustion air inlet openings in bottom panel, see “Installation”.
POSSIBLE CAUSE(S)
1. Blocked venting.
2. Insufficient combustion air.
3. Blocked heat exchanger.
4. Air leak into combustion chamber or flue collector.
CORRECTIVE ACTION
• Clean flue. Refer to “Installation”.
• Clean combustion air inlet openings in bottom panel, see “Installation”.
• Clean heat exchanger.
• Determine cause and repairaccordingly.
F. Gas Odor.
POSSIBLE CAUSE(S)
1. Shut off gas supply immediately!
2. Blocked heat exchanger/venting.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 37
Trouble Shooting
3. Drafts around heater.
4. Negative pressure in building.
5. Blocked flue collector.
CORRECTIVE ACTION
• Inspect all gas piping and repair.
• Clean heat exchanger/flue.
• Eliminate drafts. Refer to “Installation”.
• See “Installation”.
• Clean flue collector.
G. Delayed ignition.
POSSIBLE CAUSE(S)
1. Excessive primary air.
2. Main burner ports clogged near pilot.
3. Pressure regulator set too low.
4. Pilot decreases in size when main burners come on.
5. Pilot flame too small.
6. Drafts around heater.
7. Improper venting.
CORRECTIVE ACTION
• Close air shutter. Refer to “Operation".
• Clean main burner ports.
• Reset manifold pressure. Refer to “Operation”.
• Supply piping is inadequately sized. Refer to “Installation”.
• Clean pilot orifice. Refer to “Operation”.
• Refer to “Installation”.
H. Failure to Ignite.
POSSIBLE CAUSE(S)
1. Main gas off.
2. Lack of power at unit.
3. Thermostat not calling for heat.
4. Defective limit switch.
5. Improper thermostat or transformer wiring at gas valve.
6. Defective gas valve.
38 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Trouble Shooting
7. Defective thermostat.
8. Defective transformer.
9. Loose wiring.
10. Defective ignition control.
CORRECTIVE ACTION
• Open all manual gas valves.
• Replace fuse or turn on power supply.
• Turn up thermostat.
• Check limit switch with continuity tester. If open, replace limit switch.
• Check wiring per diagrams.
• Replace gas valve.
• Check thermostat and replace if defective.
• Be sure 115 volts is supplied to the transformer primary, then check for 24 volts at
secondary terminal before replacing.
• Check and tighten all wiring connections per diagrams.
• Replace, if necessary. Also see W, X & Y symptoms.
J. Condensation of water vapor.
POSSIBLE CAUSE(S)
1. Improper venting.
CORRECTIVE ACTION
• Refer to “Installation, Venting”.
K. Burner won't turn off.
POSSIBLE CAUSE(S)
1. Poor thermostat location.
2. Defective thermostat.
3. Improper thermostat or transformer former wiring at gas valve.
4. Short circuit.
5. Defective or sticking gas valve.
6. Excessive gas supply pressure.
CORRECTIVE ACTION
• Relocate thermostat away from drafts.
• Replace thermostat.
• Check wiring per diagrams.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 39
Trouble Shooting
• Check operation at valve. Look for short (such as staples piercing thermostat
wiring), and correct.
• Replace gas valve.
• Refer to “Operation”.
L. Rapid burner cycling.
POSSIBLE CAUSE(S)
1. Loose electrical connections at gas valve or thermostat.
2. Excessive thermostat heat anticipator.
3. Unit cycling on high limit.
4. Poor thermostat location.
5. Draft on Pilot.
6. Defective ignitor control (if applicable).
7. Unit cycling on high limit.
M. Noisy.
8. Defective high limit switch.
CORRECTIVE ACTION
• Tighten all electrical connections.
• Adjust thermostat heat anticipator for longer cycles. Refer to “Operation”.
• Check for proper air supply across heat exchanger.
• Relocate thermostat. (Do not mount thermostat on unit).
• Eliminate drafts. Refer to Installation.
• Replace ignitor.
• Check for proper air supply across heat exchanger.
• Jumper limit switch terminals 1 and 2. If burner operates normally, replace switch.
POSSIBLE CAUSE(S)
1. Fan blades loose.
2. Fan blades dirty.
40 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Trouble Shooting
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 41
Trouble Shooting
CORRECTIVE ACTION
• Check and tighten all wiring connections per diagrams. Thermostat wires tagged
“W” and “G” must be connected together (unless special thermostats are used; if
so, see thermostat wiring diagram). See electrical connections.
• Replace motor.
• Check for 24V across H terminals on fan time delay switch. If 24V is present, jumper
terminals numbered 1 and 3. If motor runs, the fan switch is defective and must be
replaced. If 24V is not present, check wiring per diagrams.
P. Fan motor turns on and off while burner is operating.
POSSIBLE CAUSE(S)
• Fan switch heater element improperly wired.
• Defective fan switch.
• Motor overload protector cycling on and off.
• Motor not properly oiled.
CORRECTIVE ACTION
Be sure fan switch heater terminals are connected per diagrams.
Replace fan switch.
Check motor amps against motor name plate rating, check voltage, replace fan motor if
defective.
Refer to label on motor.
Q. Fan motor will not stop.
POSSIBLE CAUSE(S)
1. Improperly wired fan control.
2. Main burners not lighting while thermostat calls for heat.
3. Defective fan switch.
CORRECTIVE ACTION
• Check all wiring.
• Refer to H or N symptoms.
• Replace fan switch.
R. Not enough heat.
POSSIBLE CAUSE(S)
1. Incorrect gas input.
2. Heater undersized.
42 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
T. Too much heat.
Trouble Shooting
3. Thermostat malfunction.
4. Heater cycling on limit control.
CORRECTIVE ACTION
• Refer to “Operation”.
• This is especially true when the heated space is enlarged. Have the heat loss
calculated and compare to the heater output (80% of input). Your gas supplier or
installer can furnish this information. If heater is under sized, add additional
heaters.
• Replace thermostat.
• There should be NO ducts attached to the front of this heater. Check air movement
through heat exchanger. Check voltage to fan motor. Clean fan blade and heat
exchanger and oil fan motor.
POSSIBLE CAUSE(S)
1. Thermostat malfunction.
2. Heater runs continuously.
CORRECTIVE ACTION
• Replace thermostat.
• Check wiring per diagrams; Check operation at valve. Look for short (such as staples
piercing thermostat wiring), and correct; Replace gas valve; Refer to “Operation”.
U. Cold air is delivered on start up.
POSSIBLE CAUSE(S)
1. Fan switch heater element improperly wired.
CORRECTIVE ACTION
• Be sure fan switch heater terminals are connected per diagrams.
V. Cold air is delivered during heater operation.
POSSIBLE CAUSE(S)
1. Incorrect manifold pressure or input.
2. Voltage to unit too high.
3. Air through put too high.
CORRECTIVE ACTION
• Refer to “Operation”.
• Check motor voltage with fan running. Should be 115 volts AC.
• Refer to “Operation”.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 43
Trouble Shooting
W. No Spark.
POSSIBLE CAUSE(S)
1. Thermostat not calling for heat.
2. No low voltage.
3. Spark gap closed or too wide.
4. Broken or cracked ceramic on spark electrode.
CORRECTIVE ACTION
• Close thermostat contacts.
• Check for 24V across 24V terminals of S8600.
• Set gap to 0.1".
• Replace pilot assembly.
X. Spark present but pilot does not light.
POSSIBLE CAUSE(S)
1. Loose S8600 connections.
2. Improper gas pressure.
3. Is spark in pilot gas stream?
4. No pilot gas — do not use match to test - presence of gas is easily detected by the
odor.
CORRECTIVE ACTION
• Check all connections, term. PV feeds 24V to pilot valve.
• Check pressure — pressure that is either too high or too low may cause a problem.
• Spark should arc from electrode.
• Check pilot line for kinks. Ensure there are no drafts.
Y. Pilot lights — Main valve does not energize.
POSSIBLE CAUSE(S)
1. Loose S8600 connections.
2. Cracked or broken sensor ceramic.
3. Check sensor/spark lead for continuity.
4. Measure 24 volts from term. MV to term. MV/PV.
CORRECTIVE ACTION
• Check connections-term. MV feeds main valve.
• Replace pilot assembly.
• Replace if needed.
44 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
• If present, replace main valve; if not,replace S8600 Igniter.
Z. Hi-Limit switch tripping.
POSSIBLE CAUSE(S)
1. Vertical run of flue is too short.
2. Unit is overfiring.
3. Air flow too low
CORRECTIVE ACTION
• Lengthen vertical run of flue pipe (see venting).
• Burner orifice may be too large:verify/replace if required.
• Increase air flow; check fan size.Check for proper voltage.
• Replace.
AA. Noisy power venter.
Trouble Shooting
POSSIBLE CAUSE(S)
1. Power venter wheel loose.
2. Power venter wheel dirty.
3. Power venter wheel rubbing housing.
4. Bearings are dry.
CORRECTIVE ACTION
• Replace or tighten.
• Clean power venter wheel.
• Realign power venter wheel.
• Oil bearings on power venter motor. (Refer to label on motor).
BB. Power venter will not run.
POSSIBLE CAUSE(S)
1. Loose wiring.
2. Defective motor overload protector or defective motor.
3. Defective power venter relay.
CORRECTIVE ACTION
• Check and tighten all wiring connections per diagrams. Thermostat wires tagged
"W" and "G" must be connected together (unless special thermostats are used; if so,
see thermostat wiring diagram). See electrical connections.
• Replace motor.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 45
Trouble Shooting
• Check for 24V across 1 and 3 terminals on fan relay. If 24V is present, jumper
terminals numbered 2 and 4. If motor runs, the relay is defective and must be
replaced.If 24V is not present, check wiring per diagrams.
CC. Power venter motor turns on and off while burner is operating.
POSSIBLE CAUSE(S)
1. Fan relay heater element improperly wired.
2. Defective venter relay switch.
3. Motor overload protector cycling on and off.
4. Motor not properly oiled.
CORRECTIVE ACTION
• Be sure venter relay heater terminals are connected per diagrams.
• Replace venter relay.
• Check motor amps against motor name plate rating, check voltage, replace power
venter motor if defective.
• Refer to label on motor.
DD. Power ventor motor will not stop.
POSSIBLE CAUSE(S)
1. Improperly wired venter relay.
2. Main burners not lighting while thermostat calls for heat.
3. Defective venter relay.
CORRECTIVE ACTION
• Check all wiring.
• Refer to H & N symptoms.
• Replace venter relay.
46 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Part Identification
Figure 20. Propeller parts: 115/1/60 motor fan guard fan blade hardware
Fan Blade
Fan Guard
Motor
Hardware
Figure 21. Component parts, bottom view
Hardware
D4430
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 47
Part Identification
Figure 22. Internal furnace components
Figure 23. Burner assembly parts
48 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Figure 24. Power vent assembly
Part Identification
Note 1. For item No. 6, use counter-clockwise rotation.
Note 2. DO NOT OVERTIGHTEN CELCON NUT! HAND TIGHTEN ONLY! DO NOT USE TOOLS!
Approximate 1/3 turn maximum or 8 inch pounds is sufficient from the point where the tube does not slip in or out.
Note 3. Flue Sizes:
30/75 units: 4" dia. flue outlet Reducer required – To be supplied by installer.
100/175 units: 4" dia. flue outlet Reducer required – To be supplied by installer.
200/250 units: 5" dia. flue outlet (no adapter required).
300/400 units: 6" dia. flue outlet Increaser required – To be supplied by manufacturer.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 49
Part Identification
Installation of Power Vented Motor
INSTALLATION INSTRUCTIONS FOR FIELD REPLACEMENT OF POWER VENTER MOTOR
WARNING
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.
Note: All hardware (screws, nuts, washers) that will be removed from the unit will be
reused for this motor replacement. DO NOT LOSE ANY OF THESE PARTS!
Figure 25. Power venter motor part identification
n
REF. NO. DESCRIPTION
1 Relay Junction Box/Mounting Bracket Assembly
2 #8 Drill Screws (2 required)
3 Pressure/Mounting Bracket Assembly
4 Mounting Plate Adapter
5 Keps Nut w/External Tooth Lockwasher (4 required)
6 Motor Support Shipping Bracket
7 Phillips Head Screws (3 required)
8 Power Venter Blower Housing
9 Blower Wheel
10 Motor
11 Space Washers (3 required)
12 Machine Screw (3 required)
13 Sensing Tube
14 Set Screw
50 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Part Identification
TOOLS AND PARTS NEEDED:
Wire Stripper and Crimper; Slotted Head and #2 Phillips Head Screwdriver; 3/8" Wrench;
1/8" Allen Wrench (long handle); marker; (1) 1/4" push on terminal for Wire.
Note:
1. Remove the cover from the Relay Junction Box (Item 1) by removing two screws
(Item 2) top and bottom. Disconnect both wires from the motor lead ends. One is
connected to terminal #4 on the venter relay, and the other is connected with a wire
nut to a black wire.
2. Remove the sensing tube (Item 13) from the Pressure Switch/Mounting Bracket
(Item 3) at motor end only. Separated Combustion Units: Remove both tubes at
motor end only note location.
3. Mark locations of the Relay Junction Box and Pressure Switch Mounting Brackets
along with the Motor (Item 10) mounts on the Mounting Adapter Plate (Item 4) using a marker.
4. Remove nut (Item 5) that secures the Motor Support Shipping Bracket (Item 6) to the
Mounting Adapter Plate. Pull this bracket away from the Motor Mounting Adapter
Plate.
5. Remove three phillips head screws (Item 7) on the Motor Mounting Adapter Plate.
Remove the Motor/Blower Wheel/Adapter Plate assembly from the Power Venter
Blower Housing (Item 8).
6. Remove the Blower Wheel (Item 9) from the motor shaft - by removing the set
screw (Item 14) using a 1/8" Allen Wrench.
7. Remove the three Motor Mounting Nuts (Item 5), Space Washers (Item 11), and
Screws (Item 12). Do not loose these parts! Using caution - the motor will disengage
from the Mounting Adapter Plate, along with the Relay Junction Box and Pressure
Switch Mounting Brackets will also disengage.
8. Reverse Order to install the new Power Venter Motor.
9. TEST FIRE THE UNIT FOR A FEW CYCLES, MAKING SURETHAT THE UNIT IS
OPERATING SATISFACTORY.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 51
Gas Equipment Start-Up
Customer ______________________ Job Name & Number _________________________
PRE-INSPECTION INFORMATION
With power and gas off.
Type of Equip. Unit Heater, Duct Furnace, Indoor, Rooftop
Serial Number_________________________ Model Number __________________________
Name Plate Voltage:_____________Name Plate Amperage:_____________
Type of Gas: Natural or LP
Ta nk C a pa ci t y
_______ lbs. Rating: ______ BTU @ ____ °F
_______ kg _____ kw @ ____ °C
Are all panels, doors, vent caps in place?
Has the unit suffered any external damage? Damage ______________________________
Does the gas piping and electric wiring appear to be installed in a professional manner?
Has the gas and electric been inspected by the local authority having jurisdiction?
Is the gas supply properly sized for the equipment?
Were the installation instructions followed when the equipment was installed?
Have all field installed controls been installed?
Do you understand all the controls on this equipment? If not, contact your wholesaler
or rep.
(DO NOT START this equipment unless you fully understand the controls.)
GENERAL (with power and gas off)
Make certain all packing has been removed.
Tighten all electrical terminals and connections.
Check damper linkages for tightness.
Check all fans & blowers for free movement.
Check all controls for proper settings.
Check all set screws on blowers and bearings.
Check belt tightness.
52 GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater
BLOWER (with power on and gas off)
Check voltage L1 _____ L2 _____ L3 _____
Check rotation of main blower.
Check motor amps L1 _____ L2 _____ L3 _____
Blower RPM _____________
Check air filters. (Record quantity & size.)
GAS HEATING (with power and gas on)
Inlet gas pressure. ____ in. W.C. or ____ kPa
Pilot & main burner ignition.
Manifold gas pressure.____ in. W.C. or ____ kPa
Cycle on HIGH LIMIT.
Gas Equipment Start-Up
Remarks:
Cycle firestat and/or freezestat.
Check electronic modulation. Set at: __________
Check mechanical modulation. Set at: ________
Cycle and check all other controls not listed.
Check operation of remote panel.
Entering air temp. _____ °F or ____ °C
Discharge air temp. (high fire) ____ °F. or ____ °C
External static pressure _________ in. W.C.
Cycle by thermostat or operating control.
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 53
Tr a n e
A business of American Standard Companies
www.trane.com
For more information, contact your local Trane
office or e-mail us at comfort@trane.com
Literature Order Number GHND-SVX01A-EN
Date 07/07
Supersedes GHND-IOM-1A (04/1992)
Trane has a policy of continuous product and product data improvement and reserves the right to
change design and specifications without notice.
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