Trane GMND-SVX01B-EN Installation, Operation And Maintenance Manual

Installation, Operation, and Maintenance

Gas Unit Heater

Separated Combustion Indoor Gas-Fired Duct Furnace

Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning 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 precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

March 2012 GMND-SVX01B-EN

SAFETY WARNING

Warnings, Cautions and Notices

Warnings, Cautions and Notices. Note that warnings,

cautions and notices appear at appropriate intervals throughout this manual. Warnings are provide to alert installing contractors to potential hazards that could result in death or personal injury. Cautions are designed to alert personnel to hazardous situations that could result in personal injury, while notices indicate a situation that could result in equipment or property-damage-only accidents.

Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions.

Read this manual thoroughly before operating or servici ng this unit.

ATT EN TI ON : Warnings, Cautions and Notices appear at

appropriate sections throughout this literature. Read these carefully:

WARNI NG

CAUTIONs

NOTICE:

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

Important Environmental Concerns!

Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants-including industry replacements for CFCs such as HCFCs and HFCs.

Responsible Refrigerant Practices!

Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified. The Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that

must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them.

WARNING

Proper Field Wiring and Grounding Required!

All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state electrical codes. Failure to follow code could result in death or serious injury.

WARNING

Personal Protective Equipment (PPE) Required!

Installing/servicing this unit could result in exposure to electrical, mechanical and chemical hazards.

• Before installing/servicing this unit, technicians MUST put on all Personal Protective Equipment (PPE) recommended for the work being undertaken. ALWAYS refer to appropriate MSDS sheets and OSHA guidelines for proper PPE.

• When working with or around hazardous chemicals, ALWAYS refer to the appropriate MSDS sheets and OSHA guidelines for information on allowable personal exposure levels, proper respiratory protection and handling recommendations.

• If there is a risk of arc or flash, technicians MUST put on all Personal Protective Equipment (PPE) in accordance with NFPA 70E or other country-specific requirements for arc flash protection, PRIOR to servicing the unit.

Failure to follow recommendations could result in death or serious injury.

ATTENTION: READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY BEFORE ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA PLATE FOR TYPE OF GAS AND ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT THESE AGREE WITH THOSE AT POINT OF INSTALLATION. RECORD THE UNIT MODEL AND SERIAL No.(s) IN THE SPACE PROVIDED. RETAIN FOR FUTURE REFERENCE.

WARN ING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this 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.

WARN ING

Overheating or Flooding Could Cause Fire or Explosion!

Overheating or flooding (where any part of the duct furnace has been under water) could result in fire or explosion. Should overheating occur, or the gas supply fails to shut off, shut off the manual gas valve to the duct furnace before shutting off the electrical supply. Do not use the duct furnace if any part has been under water. Immediately call a qualified service technician to inspect the duct furnace and replace any gas control which has been underwater. Failure to follow these recommendations could result in death or serious injury.

Warnings, Cautions and Notices

WARNING

Hazardous Gases and Flammable Vapors!

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. To avoid hazardous gases and flammable vapors follow proper installation and set up of this product and all warnings as provided in this manual. Failure to follow all instructions could result in death or serious injury.

GMND-SVX01B-EN 3

Trademarks

Trane and the Trane logo are trademarks of Trane in the United States and other countries. All trademarks referenced in this document are the trademarks of their respective owners.

3M is a trademark of 3M Company; Dow Corning is a registered trademark of Dow Corning Corporation.

Introduction

WARN ING

Safety Alert!

You MUST follow all recommendations 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. Do not touch electrical switches.

3. Extinguish any open flame.

4. Immediately call your gas supplier from a neighbor instructions.

Approved For Use in California

Toxic Hazard!

Install, operate and maintain unit in accordance with manufacturer’s instructions to avoid exposure to fuel substances or substances from incomplete combustion which could result in death or serious illness. The state of California has determined that these substances may cause cancer, birth defects, or other reproductive harm.

’s phone. Follow the gas supplier’s

WARN ING

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, during shipment and installation, problems such as loose wires, leaks, or loose fasteners may occur. It is the installer’s responsibility to inspect and correct any problems that may be found.

Receiving Instructions

Inspect shipment immediately when received to determine if any damage has occurred to the unit during shipment. After the unit has been uncrated, check for any visible damage to the unit. If any damage is found, the consignee should sign the bill of lading indicating such damage and immediately file claim for damage with the transportation company.

Important: It is the equipment owner’s responsibility to

provide any scaffolding or other apparatus required to perform emergency service or annual/periodic maintenance to this equipment.

4 GMND-SVX01B-EN

Table of Contents

Warnings, Cautions and Notices . . . . . . . . . . 2

Model Number Descriptions . . . . . . . . . . . . . . 6

Indoor Gas Heating Units . . . . . . . . . . . . . . . 6

Horizontal Blower Assembly . . . . . . . . . . . . 6

General Information . . . . . . . . . . . . . . . . . . . . . 7

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

General Safety Information . . . . . . . . . . . . . 7

Identification of Parts . . . . . . . . . . . . . . . . . . 8

Unit Dimensions and Weights . . . . . . . . . . . 10

Installation: Mechanical . . . . . . . . . . . . . . . . . 12

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . 12

Air Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Suspension . . . . . . . . . . . . . . . . . . . . . . . . 14

Nozzle Assembly . . . . . . . . . . . . . . . . . . . 14

Installation: Piping . . . . . . . . . . . . . . . . . . . . . . 16

Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Pipe Sizing . . . . . . . . . . . . . . . . . . . . . . . . 16

Pipe Installation . . . . . . . . . . . . . . . . . . . . . . 17

Installation: Venting . . . . . . . . . . . . . . . . . . . 18

Combustion Air Venting and Piping . . . . 18

Exhaust Venting . . . . . . . . . . . . . . . . . . . . 19

Installation: Concentric Vent Terminal . . . 21

Horizontal Termination . . . . . . . . . . . . . . 21

Vertical Termination . . . . . . . . . . . . . . . . . 22

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . .39

Installation: Electrical . . . . . . . . . . . . . . . . . . . 24

Electrical Connections . . . . . . . . . . . . . . . . . 24

Thermostat Wiring and Location . . . . . . 24

Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Gas Equipment Start-Up . . . . . . . . . . . . . . . 30

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Periodic Service . . . . . . . . . . . . . . . . . . . . 31

Installation Instructions for Field Replace-

ment of Power Venter Motor . . . . . . . . . . 33

How to Order Replacement Parts . . . . . . 34

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 35

GMND-SVX01B-EN 5

Model Number Descriptions

Indoor Gas Heating Units

Note: All units are AGA approved. For

CGA approved units, contact Air Handling Product Support.

Digit 1 — Gas Heating Equipment

G = Gas Heating Equipment

Digit 2 — Product Type

M = Separated Combustion 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

010 = 100 MBh 022 = 225 MBh 012 = 125 MBh 025 = 250 MBh 015 = 150 MBh 030 = 300 MBh 017 = 175 MBh 035 = 350 MBh 020 = 200 MBh 040 = 400 MBh

Digit 8 — Main Power Supply

A = 115/60/1 D = 230/60/3 B = 230/60/1 E = 460/60/3 C = 208/60/3 F = 575/60/3

Digit 9 — Gas Control Option

D = Single-Stage, Intermittent Pilot

Ignition

E = Two-Stage, Intermittent Pilot

Ignition

H = Electronic Modulating with

Room T-Stat, Intermittent Pilot Ignition

J = Electronic Modulating with

Duct-Stat, Intermittent Pilot Ignition

L = Electronic Modulating with

External 4–20 mA Input

N = Electronic Modulating with

External 0–10 Vdc Input

T = Single Stage Direct Spark

Ignition

V = Two-Stage, Direct Spark Ignition

Digit 10 — Design Sequence

G = Seventh Design

Digit 11 — Heat Exchanger Material

1 = Aluminized Steel 3 = #321 Stainless Steel

Digit 12 — Rooftop Arrangements

0 = None (Indoor Unit)

Digit 13 — Rooftop Heating Unit Motor Selection

0 = None (Indoor Unit and Rooftop

Duct Furnace)

Digit 14 — Rooftop Fan Section

0 = None (Indoor Unit and Rooftop

Duct Furnace)

Digit 15 — Miscellaneous Options

0=None A = #409 Stainless Steel Burners B = Orifices For Elevation Above

2000 Feet (Specify Elevation)

C = #409 Stainless Steel Draft

Diverter D = Summer-Winter Switch F = Horizontal Louvers G = Horizontal and Vertical Louvers

Horizontal Blower Assembly

Digit 1, 2, 3 — Horizontal Blower Assembly

Digit 4 — Development Sequence

C = Third Generation

Digit 5, 6 — Blower Size

15 = Nominal 1500 cfm 20 = Nominal 2000 cfm 30 = Nominal 3000 cfm 45 = Nominal 4500 cfm

Digit 7 — Transition Size

(Specifies Duct Furnace Size)

0 = None A = 100 MBh F = 225 MBh B = 125 MBh G = 250 MBh C = 150 MBh H = 300 MBh D = 175 MBh J = 350 MBh E=200 MBh K=400 MBh

Digit 8 — Main Power Supply

A = 115/60/1 D = 230/60/3 B = 230/60/1 E = 460/60/3 C = 208/60/3

Digit 9 — Motor Horsepower

A = 1/3 hp D = 1 hp B = 1/2 hp E = 1-1/2 hp C = 3/4 hp F = 2 hp

Digit 10 — Design Sequence

D = Fourth Design

Digit 11 — Miscellaneous Options

0=None 1 = Insulation 3 = Totally Enclosed Motor

6 GMND-SVX01B-EN

General Information

Description

The duct furnace design is certified by ETL for use with natural and LP (propane) gases. ANSI and NFPA Standards as well as Canadian installation codes referred to in this manual are the ones that were applicable at the time that the design was certified. In addition, the duct furnace may be installed on the downstream side of a cooling coil, without need of a bypass duct.

If the unit is to be installed at an altitude exceeding 2,000 feet (610 m) above sea level, derate the input by 4 percent for each 1,000 foot (305 m) rise above sea level. Special orifices are required for installations above 2,000 feet (610 m).

When units are installed in Canada, any reference to derations at altitudes in excess of 2000 feet (610 m) are to be ignored. At altitudes of 2000 to 4500 feet (610 to 1372 m), the units must be orificed to 90 percent of the normal altitude rating, and be so marked in accordance with the ETL certification.

General Safety Information

Important: This product must be installed by a licensed

plumber or gas fitter when installed within the Commonwealth of Massachusetts.

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• 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

hese installation instructions are those that

in t 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 duct furnaces are designed for use in airplane hangars when installed in accordance with current ANSI/NFPA 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 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 duct furnaces have been designed and certified to comply with CGA 2.6. Also see sections on installation in

“Aircraft Hangers,” p. 12 and “Public Garages,” p. 12.

• Do not alter the duct furnace in any way or damage to or death could occur!

• Turn off the gas supply and disconnect all electric po before servicing unit. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized and the gas can not be inadvertently turned on. Failure to turn off gas or disconnect power before servicing could result in death or serious injury.

• Follow installation instructions CAREFULLY to

void creating unsafe conditions. All wiring

a 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 Electrical Code ANSI/NFPA No. 70.

• All gas connections should be made and leaktested instructions 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 heater that requires natural gas, or vice versa, will create the risk of gas leaks, carbon monoxide poisoning and explosion.

Important: Do not attempt to convert the furnace

• Make certain that the power source conforms to

he electrical requirements of the furnace.

• All field-installed wiring must be completed by

ualified personnel. All field-installed wiring

q 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

ounding information pertaining to this duct

gr furnace. To prevent the risk of electrocution, the furnace must be securely and adequately grounded. This should be accomplished by connecting a grounded conductor between the service panel and the furnace. To ensure a proper

the unit and/or severe personal injury

wer, including remote disconnects

by a suitably qualified individual, per

plate). Using LP gas in a

or use with a fuel other than the one

f intended. Such conversion is dangerous, as it could create the risks listed previously.

GMND-SVX01B-EN 7

General Information

ground, the grounding means must be tested by a qualified electrician.

• Do not insert fingers or foreign objects into the furnace or its air mo 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 furnace is intended for general heating applications ONL potentially dangerous locations such as flammable, explosive, chemical-laden or wet atmospheres.

• In cases in which property damage may result

om malfunction of the furnace, a backup

fr system or a temperature sensitive alarm should be used.

• When connecting to existing gas lines be sure to

alve off the gas supply ahead of connection

v 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 propertyonly-damage.

Unless otherwise specified, the following conversions may be used for calculating SI unit measurements:

ving device. Do not block or

Y. It must NOT be used in

Identification of Parts

Figure 1. Combustion chamber

1. Gas valve

2. Main burners

3. Retainer spring

4. Air shutters

5. Pilot assy.

6. Manifold

1 foot = 0.305 m 1 inch water column = 0.249 kPa 1 inch = 25.4 mm 1 meter/second = FPM ÷ 196.8 1 psig = 6.894 kPa 1 liter/second = CFM x 0.472 1 pound = 0.453 kg 1000 Btu per hour = 0.293 kW 1 gallon = 3.785 L 1000 Btu/Cu. Ft. = 37.5 MJ/m

1 cubic foot = 0.028 m

8 GMND-SVX01B-EN

Figure 2. Internal furnace assembly

General Information

1. Flue Collector

2. Heat Exchanger

3. Burner Drawer

GMND-SVX01B-EN 9

Unit Dimensions and Weights

Table 1. Specification data: Separated Combustion Duct Furnace

Unit Size

100 17-7/8 15-1/2 17-1/8 4 1/2 1/2 161

125 20-5/8 18-1/4 19-7/8 4 1/2 1/2 180

150 20-5/8 18-1/4 19-7/8 4 1/2 1/2 188

175 23-3/8 21 22-5/8 4 1/2 1/2 207

200 26-1/8 23-3/4 25-3/8 5 1/2 1/2 227

225 28-7/8 26-1/2 28-1/8 5 3/4 1/2 or 3/4 246

250 31-5/8 29-1/4 30-7/8 5 3/4 1/2 or 3/4 266

300 37-1/8 34-3/4 36-3/8 6 3/4 1/2 or 3/4 305

350 42-5/8 40-1/4 41-7/8 6 3/4 1/2 or 3/4 344

400 48-1/8 45-3/4 47-3/8 6 3/4 1/2 or 3/4 383

(a) “D” dia. equals the air inlet opening and the flue discharge opening.

A B C D (Dia.)

in. (mm) in. (mm) in. (mm) in. (mm) Nat. LP lb (kg)

(454) (394) (435) (102) (73)

(524) (464) (505) (102) (82)

(524) (464) (505) (102) (85)

(594) (533) (575) (102) (93)

(664) (603) (645) (127) (103)

(733) (673) (714) (127) (116)

(803) (743) (784) (127) (121)

(943) (883) (924) (152) (138)

(1083) (1022) (1064) (152) (156)

(1222) (1162) (1203) (152) (174)

(a)

Figure 3. Dimensions, standard units

Gas Inlet

in. Weight

10 GMND-SVX01B-EN

Unit Dimensions and Weights

Table 2. Performance data

Input

Unit Size

100 100 50 80 822 90 0.10 3,700 20 2.03

125 125 62.5 100 1,028 90 0.09 4,625 20 1.92

150 150 75 120 1,233 90 0.09 5,550 20 1.81

175 175 87.5 140 1,439 90 0.09 6,475 20 1.86

200 200 100 160 1,645 90 0.09 7,401 20 1.90

225 225 112.5 180 1,850 90 0.09 8,326 20 1.93

250 250 125 200 2,056 90 0.09 9,251 20 1.96

300 300 150 240 2,467 90 0.10 11,101 20 2.00

350 350 175 280 2,878 90 0.10 12,951 20 2.02

400 400 200 320 3,289 90 0.10 14,801 20 2.05

Note: Ratings are shown for elevations up to 2,000 feet (610 m) above sea level. Above 2,000 feet (610 m), input must be derated 4 percent for each

MBh (kW) MBh (kW) MBh (kW) cfm (m

(29.3) (14.6) (23.4) (0.388) (50) (0.02) (1.746) (11) (0.51)

(36.6) (18.3) (29.3) (0.485) (50) (0.02) (2.183) (11) (0.48)

(43.9) (22.0) (35.1) (0.582) (50) (0.02) (2.620) (11) (0.45)

(51.2) (25.6) (41.0) (0.679) (50) (0.02) (3.056) (11) (0.46)

(58.6) (29.3) (46.9) (0.776) (50) (0.02) (3.493) (11) (0.47)

(65.9) (32.9) (52.7) (0.873) (50) (0.02) (3.930) (11) (0.48)

(73.2) (36.6) (58.6) (0.970) (50) (0.02) (4.366) (11) (0.49)

(87.8) (43.9) (70.3) (1.164) (50) (0.02) (5.240) (11) (0.50)

(102.5) (51.2) (82.0) (1.358) (50) (0.02) (6.113) (11) (0.50)

(117.1) (58.6) (93.7) (1.552) (50) (0.02) (6.986) (11) (0.51)

1,000 feet (305 m) above sea level. When units are ins talled i n Cana da, an y referen ce to d er ation s at alti tude s in exc ess of 2 , 000 feet (610 m) are to be ignored. At altitudes of 2,000 t o 4,500 feet (610 to 1 ,372 m), the units must be orific ed to 90 percent of the normal alt itude rating, and be so marked in accordance with the ETL certification.

Output MIN Temp. Rise P.D. MAX Temp. Rise P.D.MAX MIN

/s) °F (°C) in. of H2O (kPa) cfm (m3/s) °F (°C) in. of H2O (kPa)

Figure 4. Temperature rise and pressure drop graph

GMND-SVX01B-EN 11

Installation: Mechanical

NOTICE:

Equipment Damage!

Do not install duct furnaces in corrosive or flammable atmospheres! Premature failure of, or severe damage to the unit could result! Avoid locations where extreme drafts can affect burner operation. Duct furnaces 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 could occur!

Note: Furnace sizing should be based on heat loss

calculations where the furnace output equals or exceeds heat loss.

Aircraft Hangers. Separated Combustion must be

installed in aircraft hangars as follows: in aircraft hangars, duct furnaces must be at least 10 feet (3.0 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 or housed. 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 building or room separate from repair areas as specified in the latest edition of NFPA 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 CGA B149 “Installation Codes for Gas Burning Appliances and Equipment.”

NOTICE:

Maintain Minimum Thermostat Setting!

Separated Combustion 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 exchanger to a point where water 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 duct furnace onto the floor surface. Additional duct furnaces should be installed if a minimum 50°F (10°C) thermostat setting cannot be maintained. Failure to follow these recommendations could result in equipment or property damage.

WARNI NG

Overheating or Flooding Could Cause Fire or Explosion!

WARNI NG

Hazardous Gases and Flammable Vapors!

Clearances

Note: Increasing the clearance distances may be

necessary if there is a possibility of distortion or discoloration of adjacent materials.

WARNI NG

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.

Maintain adequate clearances around air openings into combustion chamber:

Table 3. Minimum clearances

Sides 18” (457 mm)

Top 6” (152 mm)

Bottom 25” (635 mm)

Flue 6” (152 mm)

Note: When the clearances required for acc essib ilit y are greater than the

minimum required safety clearances, the accessibility clearances take precedence.

12 GMND-SVX01B-EN

Installation: Mechanical

Increasing the clearance distances may be necessary if there is a possibility of distortion or discoloration of adjacent materials.

Accessibility

The Separated Combustion Duct Furnace is a bottom service access type. Allow a minimum of 25 inches (635 mm) at the bottom of the unit to facilitate servicing the burners and pilot. Provision should also be made to assure accessibility for recurrent maintenance purposes.

Atmospheres containing commercial solvents or chlorinated hydrocarbons will produce corrosive acids 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.

WARNING

Fire Hazard!

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. Failure to follow recommendations could result in death or serious injury.

Figure 5. Recommended design for field installation of

ductwork for straight-through arrangement

Figure 6. Recommended ductwork design for elbowed

arrangement

The Separated Combustion Duct Furnace must be installed on the positive pressure side of the air circulation blower.

Ductwork

Properly designed and installed ductwork, providing a uniformly distributed flow of air across the 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 250°F (121°C) minimum.

NOTICE:

Use 90° Duct Connection Flanges!

Ducts must be properly connected to duct furnaces for operation. Do not straighten the 90° duct connection flanges on the duct furnaces. Straightening the 90° duct connection flanges 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 inlet 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 sound.

Air Flow

The installation is to be adjusted to obtain an air throughput within the range specified on the appliance rating plate.

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 cooling. If this cfm delivery is greater than that required for heating, resulting in a low air temperature rise, install a damper

GMND-SVX01B-EN 13

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Trane GMND-SVX01B-EN Installation, Operation And Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual