Trane GUNE Installation and Maintenance Manual
Installation, Operation,
and Maintenance
Tubular Indoor Gas Fired Duct Furnace
Model Number
GUNE
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and airconditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment
by an unqualified person could result in death or serious injury. When working on the equipment, observe all pr ecautions in the literature and
on the tags, stickers, and labels that are attached to the equipment.
June 2014
GUNE-SVX001A-EN
J30-09453
Introduction
Read this manual thoroughly before operating or servicing
this unit.
Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as
required. Y our personal safety and the proper operation of
this machine depend upon the strict observance of these
precautions.
The three types of advisories are defined as follows:
WARNING
CAUTIONs
NOTICE:
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, y ou MUST f ollow r equir ements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
Indicates a potentially hazardous
situation which, if not avoided, could
result in minor or moderate injury. It
could also be used to alert against
unsafe practices.
Indicates a situation that could result in
equipment or property-damage only
accidents.
WARNING
WARNING
Personal Protective Equipment (PPE)
Required!
Installing/servicing this unit could result in exposure to
electrical, mechanical and chemical hazards.
• Before installing/servi cin g th is un it, technicians
MUST put on all PPE required for the work being
undertaken (Examples; cut r esistant glo v es/sleeves,
butyl gloves, saf ety glasses, hard hat/bump cap, fall
protection, electrical PPE and arc flash clothing).
ALWAYS refer to appropriate Material Safety Data
Sheets (MSDS)/Safety Data Sheets (SDS) and OSHA
guidelines for proper PPE.
• When working with or ar ound hazar dous chemi cals,
ALWAYS refer to the appropriate MSDS/SDS and
OSHA/GHS (Global Harmonized System of
Classification and Labelling of Chemicals) guidelines
for information on allowable personal exposure
levels, proper respiratory protection and handling
instructions.
• If there is a risk of ener gized electr ical contac t, arc, or
flash, technicians MUS T put on all PPE in accor dance
with OSHA, NFPA 70E, or other country-specific
requirements for arc flash protection, PRIOR to
servicing the unit. NEVER PERFORM ANY
SWITCHING, DISCONNECTING, OR VOLTAGE
TESTING WITHOUT PROPER ELECTRICAL PPE AND
ARC FLASH CLOTHING. ENSURE ELECTRICAL
METERS AND EQUIPMENT ARE PROPERLY RATED
FOR INTENDED VOLTAGE.
Failure to follow instructions could result in death or
serious injury.
© 2014 Trane All rights reserved GUNE-SVX001A-EN
WARNING
Safety Aler t!
You MUST follow all instru ctions below. Failure to do so
could result in death or serious injury.
For Your Safety
The use and storage of gasoline or other flammable
vapors and liquids in open containers in the vicinity
of this appliance is hazardous.
If you smell gas:
1. Open windows.
2. Don’t touch electrical switches.
3. Extinguish any open flame.
4. Immediately contact your gas supplier.
WARNING
Hazardous Gases and Flammable Vapors!
Failure to observe following instructions could result in
death or serious injury. Exposure to hazardous gases
from fuel substances have been shown to cause cancer,
birth defects or other reproductive harm. Improper
installation, adjustment, alteration, service or use of
this product could cause flammable mixtures or lead to
excessive carbon mon oxide. To avoid hazardous gases
and flammable vapors follow proper installation and
set up of this product and all warnings as provided in
this manual.
Approved for Use in California
WARNING
Toxic Hazard!
Install, operate, and maintain unit in accordance with
the manufacturer’s instructions to avoid exposure to
fuel substances, or substances from incomplete
combustion, which can cause death or serious illness.
The state of California has determined that these
substances may cause cancer, birth defects, or other
reproductive harm.
Installer’s Responsibility
Installer Please Note: This equipment has been test
fired and inspected. It has been shipped free from defects
from our factory. However, shipment and installation
problems such as loose wires, leaks, and loose fasteners
may occur. It is the installer’ s responsibility to inspect and
correct any problem that may be found.
Receiving Instructions
Inspect shipment immediately when received to
determine if any damage has occurred to the unit duri ng
shipment. After the unit has been uncrated, c heck for any
visible damage to the unit. If any damage is found, the
consignee should sign the bill of lading indicating such
Introduction
damage and immediately file claim for damage with the
transportation company.
General Safety Information
WARNING
Safety Alert!
You MUST follow all instr uctions belo w. Failure to do so
could result in death or serious injury.
• The tubular duct furnace design is certified by ETL for
use with natural and propane (LP) gases. ANSI and
NFP A Standards as well as Canadian installation codes
referred to in this manual are the ones that were
applicable at the time the design was cer t if ied. In
addition, the tubular duct fur nace may be installed on
the downstream side of a cooling unit, without need of
a bypass duct.
• Installation must be made in accordance with local
codes, or in absence of local codes, with the latest
edition of the National Fuel Gas Code, ANSI
Standard Z223.1 (NFPA 54).
All of the ANSI and NFPA Standards referred to in
these installation instructions are those that wer e
applicable at the time the design of this appliance
was certified. The ANSI Standards are available from
the CSA Information Services, (800) 463-6727, as w ell
as at www.ansi.org
available fr om the National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02169,
as well as at www.nfpa.org. These duct furnaces are
designed for use in airplane hangars when installed
in accordance with curr ent ANSI/NFP A No . 409 and in
public garages when installed in accordance with
current NFPA No. 88A and NFPA No. 88B.
If installed in Canada, the installation must conform
with local building codes, or in absence of local
building codes, with CSA-B149.1 “Installation Codes
for Natural Gas Burning Appliances and Equipment”
or CSA-B149.2 “Installati on Cod e s for Propane Gas
Burning Appliances and Equipment.” These indoor
duct furnaces have been designed and certified to
comply with CSA 2.6. Also refer to “Aircraft Hangars,”
p. 10 and “Public Garages,” p. 10.
• Do not alter the duct furnace in any w ay or damage t o
the unit and/or severe person al injury or death could
occur!
• This product must be installed by a licensed plumber
or gas fitt er when installed within the Commonw ealth
of Massachusetts.
• Turn off the gas supply and disconnect all electric
power, including remote disconnects befor e servicing
unit. Follow proper lockout/tagout procedures to
ensure the power can not be inadv e rtently energized
and the gas can not be inadve rtently tur ned on. Failur e
to turn off gas or disconnect power before servicing
could result in death or serious injury.
. The NFPA Standards are
GUNE-SVX001A-EN 3
Introduction
• Follow installation instructions CAREFULLY to avoid
creating unsafe conditions. All wiring should be done
and checked by a qualified electrician, using copper
wire only. All external wiring must conform to
applicable local codes, and to the latest edition of the
National Electric Code
ANSI/NFPA No. 70.
• All gas connections should be made and leak-t ested by
a suitable qualified individual, per instr ucti ons in this
manual. Also follow procedures listed in “Gas
Equipment Start-Up,” p. 30.
• Use only the fuel for which the duct furnace is
designed (see rating plate). Using LP gas in a heater
that requires natur al gas, or vice v ersa, will creat e the
risk of gas leaks, carbon monoxide poisoning and
explosion.
Important: Do not attempt to convert the duct
furnace for use with a fuel other than
the one intended. Such conversion is
dangerous, as it could create the risks
listed previously.
• 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.
• Make certain that the power source conforms to the
electrical requirements of the heater.
• Do not depend upon a thermostat o r other swi tch as
a sole means of disconnecting pow er when installing
or servicing heater . Always disconnect pow er at main
circuit breaker as described above. Failure to do so
could result in f atal el ectric shock.
• Special attention must be giv e n to any grounding
information pertaining to this heater. To prevent the
risk of electrocution, the heater mus t be secur ely 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 technician.
• Do not insert fing ers or fore ign objects into the heater
or its combustion air moving device. Do not block or
tamper with the heater in any manner while in
operation or just aft er it has t ur ned of f , as some parts
may be hot enough to cause injury.
• This heater is intended for general heating
applications ONLY . It must NO T be used in pot entially
dangerous locations such as flammable, explosive,
chemical-laden or wet atmospheres.
• In cases in which property damage may result from
malfunction of the heater, a backup system or a
temperature sensitive alarm should be used.
• The open end of gas piping systems being purged shall
not be discharged int o areas where there are sources
of ignition or into confined spaces UNLESS
precautions are taken as follows: 1) by ventilation of
the space, 2) by control of purging rate, 3) by
elimination of all hazardous condi tion s. All
precautions must be tak en to perform th is operation in
a safe manner!
Unless otherwise specified, the following conversions
may be used for calculating SI unit measurements:
1 foot = 0.305 m 1 inch = 25.4 mm
1 gallon = 3.785 L 1 pound = 0.453 kg
1 psig = 6.894 kPa 1 cubic foot = 0.028m
1000 BTU per hour = 0.293 kW 1 inch water column = 0.249 kPa
1000 BTU/Cu.Ft. = 37.5 MJ/m3 Liter/second = CFM x 0.472
Meter/second = FPM ÷ 1 96.8
3
Copyright
This document and the information in it are the property of
T rane, and may not be used or reproduced in whole or in
part without written permission. Trane reserve s the right
to revise this publication at any time, and to make c hanges
to its content without obligation to notify any person of
such revision or change.
Trademarks
All trademarks referenced in this document are the
trademarks of their respective owners.
Revision History
GUNE-SVX001A-EN (16 Jun 2014)
• First versio n of this literature
4 GUNE-SVX001A-EN
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warnings, Cautions, and Notices . . . . . . . . 2
General Safety Information . . . . . . . . . . . . . 3
Copyright . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Model Number Description . . . . . . . . . . . . . . . 6
General Information . . . . . . . . . . . . . . . . . . . . . 7
Dimensional Data and Weights . . . . . . . . . . . 8
Performance Data . . . . . . . . . . . . . . . . . . . . . . . 9
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Locating Units . . . . . . . . . . . . . . . . . . . . . . . . 10
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Accessibility Clearance . . . . . . . . . . . . . . 10
Atmospheric Considerations . . . . . . . . . . 10
Aircraft Hangars . . . . . . . . . . . . . . . . . . . . 10
Public Garages . . . . . . . . . . . . . . . . . . . . . 10
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Air Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Combustion Inlet Air Ventilation . . . . . . . 11
Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Suspension . . . . . . . . . . . . . . . . . . . . . . . . 12
Conversion of access side . . . . . . . . . . . . 12
Gas Pipe Sizing . . . . . . . . . . . . . . . . . . . . . 13
Pipe Sizing . . . . . . . . . . . . . . . . . . . . . . . . 13
Pipe Installation . . . . . . . . . . . . . . . . . . . . 14
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Venting for Power Vented Duct Furnaces
(Category III) . . . . . . . . . . . . . . . . . . . . . . . 16
Vertically Vented Duct Furnaces (Category III)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Horizontally Vented Duct Furnaces
(Category III) . . . . . . . . . . . . . . . . . . . . . . . 17
Combustion Air . . . . . . . . . . . . . . . . . . . . 20
Exhaust Venting . . . . . . . . . . . . . . . . . . . . 21
Shut Down . . . . . . . . . . . . . . . . . . . . . . . . .27
Gas Input Rate . . . . . . . . . . . . . . . . . . . . . .28
Tubular Duct Furnace—High Altitude Dera-
tion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Gas Equipment Start-Up . . . . . . . . . . . . . . . . .30
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Periodic Service . . . . . . . . . . . . . . . . . . . . . . .31
Identification of Parts Tubular Duct Furnace
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
How To Order Replacement Parts . . . . . . . .33
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . .34
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Electrical Connections . . . . . . . . . . . . . . . . . . . 25
Thermostat Wiring and Location . . . . . . 25
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Tubular Duct Furnace Direct Spark Ignition 27
Explanation of Controls . . . . . . . . . . . . . . 27
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
GUNE-SVX001A-EN 5
Model Number Description
12345678910111213141516
GUNE020AHA10000B
Digit 1 — Gas Heating
Equipment
G = Gas Heating Equipment
Digit 2 — Product Type
U = Tubular Duct Furnace
Digit 3 — Fuel Type
N=Natural Gas
P = Propane Gas (LP)
Digit 4 — Developmental
Sequence
E = Current Developmental
Sequence
Digits 5, 6, 7 — Input Capacity
(MBh)
010 = 100
015 = 150
020= 200
025= 250
030= 300
035= 350
040= 400
Digit 8 — Main Power Supply
A = 115/60/1
B = 230/60/1
C = 208/60/3
D = 230/60/3
E = 460/60/3
F = 575/60/3
G = 208/60/1
Digit 9 — Gas Control Option
H = Electronic Modulating w/Room
Sensing
J = Electronic Modulating w/Duct
Thermostat
L = Electronic Modulation
w/External 4–20 mA Input
M = Electronic Modulation
w/External 0–10 Vdc Input
T = Single-Stage, Direct Spark
Ignition
V = Two-Stage, Direct Spark Ignition
W = Electronic Modulation w/Duct
Thermostat/Room Override Stat
Digit 10 — Design Sequence
A=First Design
Digit 11 — Heat Exchanger
Material
1 = Standard (Aluminized Steel)
2 = 409 Stainless Steel
Digit 12, 13, 14 — Reserved for
Future Use
0=Not Used
Digit 15 — Miscellaneous
0=None
B = Air Pressure Switch for Above
5,000 Feet
G = Horizontal and Vertical Louvers
W = Stainless Steel Drain Pan
6 GUNE-SVX001A-EN
General Information
Important: It is the equipment owners responsibility to
provide any scaffolding or other apparatus
required to perform emergency service or
annual/periodic maintenance to this
equipment
The Tubular Indoor Gas-Fired Duct Furnace is a factory
assembled, power vented, and low static pressure type
duct furnace with a low profile cabinet. The duct furnace
can also be easily field converted to separated
combustion. The design is certified by ETL as providing a
minimum of 82 percent thermal efficiency, and approved
for use in California. Do not alter these units in any w ay . If
you have any questions after reading this manual, contact
the manufacturer.
Figure 1. Front
Figure 2. Back
GUNE-SVX001A-EN 7
Dimensional Data and Weights
Table 1. Dimensional data and weights—tubular duct furnace dimensions, inches (mm)
Unit Capacity 100 150 200 250 300 350 400
“A” Overall Unit Height
“B” Height to Centerline Flue
“C” Height to Gas Connection
“D” Opening Height, Front & Rear
“E” Overall Unit Depth
“F” Flue Size Diameter
“G” Air Inlet Size Diameter
Gas Inlet, Natural Gas, inches 1/2 1/2 1/2 3/4 3/4 3/4 3/4
Gas Inlet, Natural Gas, inches 1/2 1/2 1/2 3/4 3/4 3/4 3/4
Approximate Unit Weight, lb (kg)
Approximate Ship Weight, lb (kg)
10.3 13.7 17 20.2 23.5 26.7 30
(262) (348) (432) (513) (597) (678) (762)
7.6 10.5 11.9 6.8 8.4 10 11.6
(193) (267) (302) (173) (213) (254) (295)
2.5 3.7 5.3 7 7 8.7 10.3
(64) (94) (135) (178) (178) (221) (262)
8.5 11.7 15 18.2 21.5 24.7 28
(216) (297) (381) (462) (546) (627) (711)
32.7 32.7 32.7 33.5 33.5 33.5 33.5
(831) (831) (831) (851) (851) (851) (851)
5556666
(127) (127) (127) (152) (152) (152) (152)
5556666
(127) (127) (127) (152) (152) (152) (152)
160 221 250 270 296 321 355
(73) (100) (113) (122) (134) (146) (161)
270 331 360 403 429 454 488
(122) (150) (163) (183) (195) (206) (221)
Figure 3. Tubular duct furnace dimensions
ACCESS PANEL
A
PEEP
HOLE
32.5
SIDE VIEW
D9362
F
CONNECTION
POWER
CONNECTION
E
GAS
1.5
30.500
B
C
1.5
15.251
10.3
4
16.5
HANGING
LOCATION
7.197
65.500
D
OPENING
FRONT & REAR
48.7
OPENING
FRONT & REAR
REAR VIEW
1.000
G
27.50
1.50
47.50
TOP VIEW
8 GUNE-SVX001A-EN
Performance Data
Size 200
Size 250
Size 300
Size 350
Size 400
Size 150
Size 100
0
25
50
75
100
125
150
175
200
225
250
275
300
012345
0
0.2
0.4
0.6
0.8
1
1.2
1.4
Pa
m3/s
Pressure Drop, inches W.C.
Size 150 Size 200 Size 250 Size 300 Size 350 Size 400
Size 100
6
11
16
21
26
31
36
41
46
51
56
10
20
30
40
50
60
70
80
90
100
0 2000 4000 6000 8000 10000
°C
Temperature Rise, °F
Airflow (CFM )
Table 2. Tubular duct furnace performance data
Input
Unit Size
100
150
200
250
300
350
400
Notes:
1. Ratings are shown for unit installations at elevations between 0 and 2,000 feet (610m).
2. For unit installations in U.S.A. above 2,000 feet (610 m), the unit input must be field der a te d 4 percent for each 1,000 feet (305 m) above sea level;
refer to local codes, or in absence of local codes, refer to the latest edition of the National Fuel Gas Code, ANSI Standard Z223.1 (NFPA 54).
3. For installations in Canada, any references to deration at altitudes in excess of 2,000 feet (610 m) are to be ignored. At altitudes of 2,000 to
4,500 feet (610 to 1372 m), the unit must be field derated and be so marked in accordance with the ETL certification.
4. See Tab le 10 and Table 11, p. 29 for U.S.A. and Canadian field deration information.
(kW)
100 50 82 758 100 0.07 2528 30 0.65
(29.3) (14.6) (24.0) (0.357) (56) (0.017) (1.193) (17) (0.16)
150 75 123 1137 100 0.03 3792 30 0.44
(43.9) (21.9) (36.0) (0.536) (56) (0.007) (1.789) (17) (0.11)
200 100 164 1517 100 0.04 5057 30 0.54
(58.6) (29.3) (48.0) (0.715) (56) (0.009) (2.386) (17) (0.13)
250 125 205 1896 100 0.08 6321 30 0.76
(73.2) (36.6) (60.0) (0.894) (56) (0.019) (2.983) (17) (0.19)
300 150 246 2275 100 0.03 7585 30 0.69
(87.8) (43.9) (72.0) (1.074) (56) (0.007) (3.579) (17) (0.16)
350 175 287 2654 100 0.07 8849 30 0.76
(102.5) (51.2) (84.1) (1.252) (56) (0.017) (4.176) (17) (0.19)
400 200 328 3034 100 0.08 10,114 30 0.70
(117.1) (58.6) (96.1) (1.431) (56) (0.019) (4.773) (17) (0.17)
(Max) MBh
(Min) MBh
(kW)
Output
MBh (kW)
Min CFM
(m3/s)
Temp rise
°F (°C)
P.D. in. wc
(kPa)
Max CFM
(m3/s)
Temp rise
°F (°C)
P.D. in. wc
(kPa)
Figure 4. Temperature rise and pressure drop graph
GUNE-SVX001A-EN 9
Installation
Locating Units
NOTICE:
Equipment Damage!
Do not install unit heaters in corrosive of flammable
atmospheres! Pr ematur e f ailure of , or sever e damage t o
the unit will result!
NOTICE:
Equipment Damage!
Avoid locations where extreme drafts can affect burner
operation. Duct furnaces mus t 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!
Important: Location of unit heaters is related directly to
the selection of sizes. Basic rules are as
follows,
Clearances
WARNING
Combustible Materials!
Failure to mainta in proper clearance between the unit
heat exchanger, vent surfaces and combustible
materials could cause a fire which could result in death
or serious injury or property damage. Refer to Table 3
for proper clearances.
Maintain adequate clearances around air openings into
the combustion chamber:
Table 3. Minimum safety clearances
Sides 6 inches (152 millimeters)
Top 6 inches (152 millimeters)
Bottom 6 inches (152 millimeters)
Flue 6 inches (152 millimeters)
(a) When clearances required for accessibility are greater than the mini-
mum safety clearances, the accessibility clearances take precedence.
Accessibility Clearance
The duct furnace must have 18 inches (457 mm) clearance
on the control cabinet end. Provision should also be made
to assure accessibility for recurrent maintenance
purposes.
Atmospheric Considerations
Atmospheres containing commercial solvents or
chlorinated hydrocarbons will produce corrosive acids
(a)
when coming in contact with the flames. This will greatly
reduce the life of the gas duct furnace and may void the
warranty. Avoid such areas.
Important: If the gas duct furnace is to be used in a
building classified as having a hazardous
atmosphere, the installation must comply
with the standards set by the National
Board of Fire Underwriters. Consult the
authorities having jurisdiction before
starting the job.
The duct furnace must be installed on the positive
pressure side of the air circulation blower.
Airc raft Hangars
In aircraft hangars, duct furnaces must be at least 10 feet
(3.05 m) above the upper surface of wings or engine
enclosures of the highest aircraft to be stored in the hangar
and 8 feet (2.4 m) above the floor in shops, offices, and
other sections of the hangar where aircraft are not stored
and housed. Refer to cur rent 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, duct furnaces must be installed in a
detached buildin g or room separated from repair areas as
specified in the latest edition of NFP A 88B, Repair Garages.
In parking structures, duct furnaces must be installed so
that the burner flames are located a minimum of 18 inches
(457 mm) above the floor or protected by a partition not
less than 18 inches (457 mm) high. Refer to the latest
edition of NFPA 88A, Parking Structures.
In Canada, installation must be in accordance with the
latest edition of CSA B149 “Installation Codes for Gas
Burning Appliances and Equipment.”
Important:
• The duct furnace must be installed such that the gas
ignition control system is not directly exposed to water
spray, rain, or dripping water.
• Duct furnaces 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 duct furnaces are operated to maintain lower than 50°F
(10°C), hot flue gases are cooled inside the heat exc hanger
to the point where water vapor (a flue gas by-product)
condenses onto the heat exchanger walls. The result is a
mildly corrosive acid that prematurely corr odes the
aluminized steel heat exchanger and can actually drip
water down from the duct furnace onto the floor surface
below. Additional duct furnaces should be installed if a
minimum 50°F (10°C) thermostat setting cannot be
maintained.
10 GUNE-SVX001A-EN
Installation
Ductwork
Properly designed and installed ductwork, providing a
uniformly distributed flow of air across all surfaces of the
heat exchanger, is essential to satisfactory unit
performance and life of the equipment.
All duct connection flanges/seams must be sealed to
prevent air leaks. Sealant/tape must be suitable for
temperatures of 250°F (121°C) minimum.
Note: Any attempts to straighten the 90° duct connection
flanges on the duct furnaces will affect the
operation of the furnace and will void the warranty .
If uniform air distribution is not obtained, install additional
baffles and/or turning vanes in the ductwork.
Figure 5 and Figure 6 illustrate recommended ductwork
designs for both the straight-through and elbowed air i nlet
arrangements.
Access panels large enough to observe smoke and
reflected light, and to detect the presence of leaks in the
heating equipment, are required both upstream and
downstream from gas duct furnaces. These panels must
be sealed to prevent air leaks. If allowed by local
regulations, install canvas connectors between the
ductwork and fan discharge opening to eliminate the
transmission of mechanical vibration.
bypass around the gas duct furnace to bypass a po rtion of
the air.
Figure 5. Recommended ductwork design for straight-
through arrangement
Figure 6. Recommended ductwor k design for elbow ed
arrangement
Air Flow
The installation is to be adjusted to obtain an air
throughput within the range specified on the appliance
rating plate.
Combustion Inlet Air Ventilation
Inlet Air From Another Room
If the duct furnace is installed in a separate room or
compartment, provide two inlet air openings. The size of
each vent opening should be no less than one square inch
(6.452 square centimeters) of free area for each
1000 Btu/h (293 W) input. Each opening must not be less
than 100 square inches (645 square centimeters).
Inlet Air From Outdoors
If the enclosed space is to have inlet combustion air from
the outside, the vent opening should be no less than one
square inch (6.452 square centimeters) of free area for
each 2500–3000 Btu/h (733–879 W) input. Each opening
must not be less than 100 square inches (645 square
centimeters).
Bypass
When a gas duct furnace is installed to operate in
conjunction with a summer air conditioning system, the
CFM air delivery of the system blower should be adjusted
to meet the design air volume requirements for co oling. If
this CFM delivery is greater than that required for heating,
resulting in a low air temperature rise, install a damper
GUNE-SVX001A-EN 11
Installation
SECTION A-A
SCALE 1:1
A
A
D9376
A
I
R
F
L
O
W
←
3/8" THREADED SUSPENSION ROD
& JAM NUT BY INSTALLER
OUTSIDE JACKET
PANEL (UNIT)
Suspension
Figure 7. Typical suspension
Conversion of access side
WARNING
Heavy Object!
Make certain that the lifting methods used to lift the
duct furnace are capable of supporting the weight of
the heater during installation. See Table 1, p . 8 for unit
weights.
Ensure that all hardware used in the suspension of each
duct furnace is more than adequate for the job.
Make certain that the structure to which the duct
furnace is to be mounted is capable of safely supporting
its weight. Under no circumstances must the gas lines,
venting system, or the electrical conduit be used to
support the duct furnace. Do not allow objects (i.e.
ladder) or people to lean against the gas lines, venting
system, or electrical conduit for support.
Failure to follow these instructions could result in
death, serious injury, and property damage.
NOTICE:
Equipment Damage!
The duct furnace must be hung level from side to side
and front to back, from f our suspension points provided
at the top of the unit. Failur e t o do so will r e sult in poor
performance and/or premature failure of the unit. Refer
to Figure 7 for typical suspension. DO NOT mount duct
furnaces in series (one in front of another).
Important: Minimum safety clearances must also be
maintained; see Table 3, p. 10. When
service/accessibility clearances are greater
than minimum safety clearances, service/
accessibility clearances take precedence.
Refer to “Clearances,” p. 10.
12 GUNE-SVX001A-EN
The tubular duct furnace is built and shipped as right side
access—when looking in the direction of airflow, g as and
flue connections, control cabinet access are on the right
hand side and the combustion air inlet is on top. When
looking in the direction of airflow, you will be facing the
entering air side of the duct furnace. T o conver t the unit to
left side access:
1. Before suspending unit, flip the duct furnace 180°
width-wise (not rotated) so the gas and flue
connections are still on the entering air side of the duct
furnace.
2. Remove the four (4) screws holding the combustion air
inlet screen (now located on the bottom of the unit); the
screen and gasket can be removed and set aside.
3. Remove the four (4) screws holding the block-off plate
(now located on the top of the unit); the plate and the
gasket can be removed and set aside.
4. Reinstall the block-off plate and its gasket on the
bottom of the unit using the four (4) screws.
5. Reinstall the combustion air inlet screen and its g asket
on the top of the unit using the four (4) screws.
It is not required to switc h the combustion air inlet screen
and block-off plate locations once the unit has been
flipped. However, due to combustion noise, it is
recommended to keep the air inlet screen on top for
overhead installations.
Important: If unit access side is converted, ensure
accessibility clearance is taken into account
for the new control cabinet end of the unit
before suspension/installation.
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