Trane GBNE Installation and Maintenance Manual

Installation, Operation
and Maintenance

Tubular Gas Fired Blower Style

Unit Heater

Model: GBNE

SAFETY WARNING

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.

November 2013

GBNE-SVX001A-EN

J30-09409

Table of Contents

Description ........................................................................... 3

Model Number Description .................................................4

General Safety Information .................................................5

Installation .............................................................................7

Installation Continued

Gas Piping .................................................................10

Installation Continued

Pipe Installation ........................................................11

Blower Set Up and Adjustment .........................................12

Motor and Pulley ................................................................13

Electrical Connections ........................................................14

Venting .................................................................................19

Vertically Vented Unit Heaters

(Category I) ................................................................19

Horizontally Vented Unit Heaters

(Category III) ..............................................................20

Operation
Power Vented Propeller Units Direct Spark Ignition ...24

Operation

Primary Shutter Adjustment ....................................25

Gas Input Rate .....................................................................25

Tubular Propeller Troubleshooting Guide ........................23

Tubular Propeller Troubleshooting Guide with

LED Indicator Assistance ....................................................26

Maintenance ........................................................................30

Limited Warranty ................................................................31

Identification of Parts Propeller Unit Heaters ...................32

Gas Equipment Start-Up ....................................................34

2 GBNE-SVX001A-EN

Description

NOTICE: 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 Power Vented Gas Fired Blower Unit Heaters are factory assembled, high static pressure type, centrifugal blower units
designed for heavy duty applications such as continuous operation or where a single unit heater must do the entire heating
job in a large area. These blower type unit heaters may be used with the standard adjustable louvers, with short duct runs
or discharge nozzles for spot heating. These blower type unit heaters may be used where low sound levels are required. The
designs are certified by ETL as providing a minimum of 83% 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 - Tubular Blower Unit Heater

See Identification of Parts, Figures 12 through 18.

The following terms are used throughout this manual, in addition to the ETL requirements to bring attention to the presence
of potential hazards, or to important information concerning the product:

WARNING

Indicates an imminently hazardous situation which, if not
avoided, could result in death, serious injury, or substantial
property damage.

WARNING: Improper installation, adjustment, alteration,

service or maintenance can cause property damage, injury,
or death. Read the installation, operating, and maintenance
instructions thoroughly before installing or servicing this
equipment.

INSTALLER'S RESPONSIBILITY: Installer Please Note:

CAUTION

Indicates an imminently hazardous situation which, if not
avoided, may result in minor injury, or property damage.

NOTICE: Used to notify of special instructions on

installation, operation, or maintenance which are
important to equipment but not related to personal
injury.

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.

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 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.

WARNING: Install, operate, and maintain unit in accordance

FOR YOUR SAFETY: If you smell gas:

1. Open windows.

2. Don't touch electrical switches.

3. Extinguish any open flame.

4. Immediately contact your gas supplier.

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.

3GBNE-SVX001A-EN

Model Number Description

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

G B N E 0 2 0 A T A 1 0 0 0 J

Digit 1 - Gas Heating Equipment

G - Gas Heating Equipment

Digit 2 - Product Type

B - Tubular Blower

Digit 3 - Fuel Type

N - Natural Gas
P - Propane Gas (LP)

Digit 4

E - Development Sequence

Digits 5,6,7 - Input Capacity

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

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 Sensing
L - Electronic Modulation w/external 4-20mA input
N - Electronic Modulation w/external 0-10VDC input
T - Single Stage, Direct Spark Ignition
V - Two Stage, Direct Spark Ignition
W - Electronic Modulation w/Duct Sensing & Room Override Stat

Digit 10 - Design Sequence

A - First design

Digit 11 - Heat Exchanger Material

1 - Standard (Aluminized Steel)
2 - 409 Stainless Steel

Digits 12,13,14

0

Digit 15 - Miscellaneous

0 - None
A - Stainless Steel Burner
B - Air Pressure Switch for Above 5000 Feet
C - 409 Stainless Steel Flue Collector
D - With Summer/Winter Switch
E - Vertical Louvers
J - Totally Enclosed Motor
H - Duct Discharge Flange
3 - Premium Efficiency, Open Drip Proof
4 - Premium Efficiency, Totally Enclosed

4 GBNE-SVX001A-EN

General Safety Information

WARNING

Failure to comply with general safety information may result in
extensive property damage, severe personal injury, or death.

WARNING

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 the
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 CSA Information Services,
1-800-463-6727. 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.

If installed in Canada, the installation must conform with local
building codes, or in the absence of local building codes,
with CSA-B149.1 “Installation Codes for Natural Gas Burning
Appliances and Equipment” or CSA-B149.2 “Installation
Codes for Propane Gas Burning Appliances and Equipment.”
These unit heaters have been designed and certified to
comply with CSA 2.6. Also see sections on installation in
AIRCRAFT HANGARS and PUBLIC GARAGES.

WARNING

Do not alter the unit heater in any way or damage to the unit
and/or severe personal injury or death may occur!

WARNING

Do not attempt to convert the heater for use with a fuel other
than the one intended. Such conversion is dangerous, as it will
create the risks previously listed.

Make certain that the power source conforms to the electrical
requirements of the heater.

WARNING

Do not depend upon a thermostat or other switch as sole means
of disconnecting power when installing or servicing heater.
Always disconnect power at main circuit breaker as described
above. Failure to do so could result in fatal electric shock.

Special attention must be given to any grounding information
pertaining to this heater. To prevent the risk of electrocution,
the heater must be securely and adequately grounded. This
should be accomplished by connecting a ground conductor
between the service panel and the heater. To ensure a proper
ground, the grounding means must be tested by a qualified
electrician.

Do not insert fingers or foreign objects into 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.

In cases in which property damage may result from
malfunction of the heater, a back-up system or temperature
sensitive alarm should be used.

WARNING

Disconnect all power and gas supplies before installing or ser­vicing the heater. If the power disconnect is out of sight, lock it
in the open position and tag it to prevent unexpected applica­tion of power. Failure to do so could result in fatal electric shock,
or severe personal injury.

CAUTION

Ensure that all power sources conform to the requirements of
the unit heater, or damage to the unit will result!

Follow installation instructions CAREFULLY to avoid creating
unsafe conditions. All wiring should be done and checked
by a qualified electrician, using copper wire only. All gas
connections should be made and leak-tested by a suitably
qualified individual, per instructions in this manual. Also
follow procedures listed on “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 risk of gas leaks, carbon monoxide
poisoning, and explosion.

CAUTION

The open end of piping systems being purged shall not dis­charge into areas where there are sources of ignition or into
confined spaces UNLESS precautions are taken as follows: (1)
by ventilation of the space, (2) control of the purging rate, (3)
elimination of all hazardous conditions. All precautions must be
taken to perform this 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/cu. ft. = 37.5 MJ/m3
1000 BTU per hour = 0.293 kW
1 inch water column = 0.249 kPa
1 litre/second = CFM x 0.472
1 meter/second = FPM ÷ 196.8

3

5GBNE-SVX001A-EN

Table 1 - Performance and Dimensional Data - Tubular Blower Unit Heater

Unit Size 100 125 150 175 200 250 300 350 400
PERFORMANCE DATA†
Input - BTU/Hr. 100,000 125,000 150,000 175,000 200,000 250,000 300,000 350,000 400,000
(kW) (29.3) (36.6) (44.0) (51.3) (58.6) (73.3) (87.9) (102.6) (117.2)
Output - BTU/Hr. 83,000 103,750 124,500 145,250 166,000 207,500 246,000 290,500 332,000
(kW) (24.3) (30.4) (36.5) (42.6) (48.6) (60.8) (72.1) (85.1) (97.3)
Thermal Efficiency - % 83 83 83 83 83 83 82 83 83
Free Air Delivery - CFM 1,181 1,476 1,771 2,067 2,362 2,953 3,501 4,134 4,724
(cu. m/s) (0.557) (0.697) (0.836) (0.976) (1.115) (1.394) (1.652) (1.951) (2.230)
Air Temperature Rise - Deg. F 65 65 65 65 65 65 65 65 65
(Deg. C) (36) (36) (36) (36) (36) (36) (36) (36) (36)
Outlet Velocity - FPM 370 463 555 395.0 451.0 564.0 422 498 570
(m/s) (1.879) (2.351) (2.819) (2.006) (2.291) (2.864) (2.143) (2.529) (2.895)
Full Load Amps at 115V 7.3 9.4 9.4 14.2 14.2 15.6 15.6 20.8 20.8
Maximum Circuit Ampacity 8.6 11.2 11.2 17.1 17.1 18.9 18.9 25.4 25.4
MOTOR DATA: Motor HP 1/4 1/2 1/2 3/4 3/4 1 1 1-1/2 1-1/2
Motor kW 0.19 0.37 0.37 0.56 0.56 0.75 0.75 1.11 1.11
Motor Type ODP** SPH SPH SPH SPH SPH Cap. Start Cap. Start Cap. Start Cap. Start
RPM 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1,725
Amps @ 115V 5.1 7.2 7.2 11.6 11.6 13.0 13.0 18.2 18.2
DIMENSIONAL DATA - inches (mm)
"A" Height to Top of Flue 33-3/4 33-3/4 33-3/4 33-3/4 33-3/4 33-3/4 34 34 34
(857) (857) (857) (857) (857) (857) (864) (864) (864)
"B" Jacket Width of Unit 20-3/4 20-3/4 20-3/4 32-3/4 32-3/4 32-3/4 50-3/4 50-3/4 50-3/4
(527) (527) (527) (832) (832) (832) (1289) (1289) (1289)
"C" Width to Centerline Flue 13-3/8 13-3/8 13-3/8 19-3/8 19-3/8 19-3/8 28-3/8 28-3/8 28-3/8
(340) (340) (340) (492) (492) (492) (721) (721) (721)
"D" Depth to Front Hanger 21 21 21 21 21 21 21 21 21
(533) (533) (533) (533) (533) (533) (533) (533) (533)
"E" Hanging Distance Width 18-5/8 18-5/8 18-5/8 30-5/8 30-5/8 30-5/8 48-5/8 48-5/8 48-5/8
(473) (473) (473) (778) (778) (778) (1235) (1235) (1235)
"F" Hanging Distance Depth 19 19-1/2 19-1/2 32-3/4 32-3/4 32-3/4 23-1/2 32-3/4 32-3/4
(483) (495) (495) (832) (832) (832) (597) (832) (832)
"G" Discharge Opening Width 18-3/4 18-3/4 18-3/4 30-3/4 30-3/4 30-3/4 48-3/4 48-3/4 48-3/4
(476) (476) (476) (781) (781) (781) (1238) (1238) (1238)
"H" Depth to Centerline Flue 4-3/4 4-3/4 4-3/4 4-3/4 4-3/4 4-3/4 5-1/8 5-1/8 5-1/8
(121) (121) (121) (121) (121) (121) (130) (130) (130)
"L" Discharge Opening Height 24-1/2 24-1/2 24-1/2 24-1/2 24-1/2 24-1/2 24-1/2 24-1/2 24-1/2
(622) (622) (622) (622) (622) (622) (622) (622) (622)
"M" Overall Unit Width 25-1/4 25-1/4 25-1/4 37-1/4 37-1/4 37-1/4 55-1/4 55-1/4 55-1/4
(641) (641) (641) (946) (946) (946) (1403) (1403) (1403)
"P" Overall Unit Depth 49-3/4 49-3/8 49-3/8 56-1/8 56-1/8 56-1/8 53-3/8 56-1/8 56-1/8
(1264) (1254) (1254) (1426) (1426) (1426) (1356) (1426) (1426)
*Flue Size Diameter - in 5 5 5 5 5 5 6 6 6
(mm) (127) (127) (127) (127) (127) (127) (152) (152) (152)
Blower Size - inches (Qty) 9 10 10 12 12 12 10 (2) 12 (2) 12 (2)
Gas Inlet, Natural Gas - in 1/2 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4
Gas Inlet, LP Gas - in 1/2 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4
Approximate Unit Weight - lb 171 175 202 245 264 289 370 390 429
(kg) (78) (79) (92) (111) (120) (131) (168) (177) (195)
Approximate Ship Weight - lb 256 261 289 381 400 425 520 547 595
(kg) (116) (118) (131) (173) (181) (193) (236) (248) (270)

† Ratings shown are for unit installations at elevations between 0 and 2,000 ft (0 to 610m). For unit installations in U.S.A. above 2,000 ft. (610m), the unit input must be field derated 4% for

each 1,000 ft. (305m) above sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the National Fuel Gas Code, ANSI Standard Z223.1 (N.F.P.A. No. 54).

For installations in Canada, any reference to deration at altitudes in excess of 2,000 ft. (610m) are to be ignored. At altitudes of 2,000 ft. to 4,500 ft. (610 to 1372m), the unit must be field

derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certification. See Table 8A for field deration information.

* Flue collar is factory supplied with unit; to be field installed per included instructions.

** LEGEND: SPH = SPLIT PHASE CAP. START = CAPACITOR START ODP = OPEN DRIP PROOF

6 GBNE-SVX001A-EN

Installation

Figure 2 - Dimensional Drawing - Tubular Blower Unit Heater

1 1/8

D8931B

E

C

Electrical Control Panel

Flue

Rear View

H

F

Gas Valve

Side View

WARNING

Do not install unit heaters in corrosive of flammable atmospheres!
Premature failure of, or severe damage to the unit will result!

WARNING

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.

NOTICE: Location of unit heaters is related directly to the
selection of sizes. Basic rules are as follows:

MOUNTING HEIGHT: Unit Heaters equipped with standard
fan guards must be installed at a minimum of 8' (2.4m) above
the floor, measured to the bottom of the unit. For mounting
heights above 8', see Table 2 to compare unit height to heat
throw distance.

AIRCRAFT HANGARS: Unit Heaters must be installed in
aircraft hangars as follows: In aircraft hangars, unit heaters
must be at least 10' (3.0m) above the upper surface of wings
or engine enclosures of the highest aircraft to be stored in
the hangar, and 8' (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.

32 1/2

D

P

M

B

G

(Discharge

Opening)

L

(Discharge

Opening)

33

A

Front View

D8931B

In Canada, installation must be in accordance to the latest
edition of CSA B149 “Installation Codes for Gas Burning
Appliances and Equipment.”

AIR DISTRIBUTION: Direct air towards areas of maximum
heat loss. When multiple heaters are involved, circulation
of air around the perimeter is recommended where heated
air 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 impede the warm air distribution patterns. Heat
throw distances are presented in Table 2.

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.

PUBLIC GARAGES: In repair garages, unit heaters must be
located at least 8' (2.4m) above the floor. Refer to the latest
edition of NFPA 88B, Repair Garages.

7GBNE-SVX001A-EN

Installation (continued)

Table 2 - Heat Throw Data

Standard Heater 30° Nozzle 60° Nozzle 90° Nozzle

Degree

Nozzle

None 8 60 65 70 75 80 90 105 110 120

* It is not recommended to mount a unit with a 90° nozzle under 10 feet.
Notes: 1. All throw data figures are approximations. Allowances should be made for optimum performance, altitude, etc.

2. NR - Units not recommended at these mounting heights.

3. 30°, 60° and 90° nozzles are shipped unassembled.

Distance From

Floor to Bottom

of

of Unit "H" -

Feet (m)

(2.4) (18.3) (19.8) (21.3) (22.9) (24.4) (27.4) (32.0) (33.5) (36.6)

10 54 56 60 64 68 78 90 95 100

(3.0) (16.5) (17.1) (18.3) (19.5) (20.7) (23.8) (27.4) (29.0) (30.5)

12 44 46 49 57 61 68 80 84 90

(3.7) (13.4) (14.0) (14.9) (17.4) (18.6) (20.7) (24.4) (25.6) (27.4)

15

(4.6) (13.7) (14.9) (15.8) (18.3) (21.3) (22.6) (24.4)

20

(6.1) (14.0) (16.5) (19.2) (20.1) (21.3)

30° 8 65 70 75 80 85 95 115 120 125

(2.4) (19.8) (21.3) (22.9) (24.4) (25.9) (29.0) (35.1) (36.6) (38.1)

10 57 60 64 68 72 86 99 105 110

(3.0) (17.4) (18.3) (19.5) (20.7) (21.9) (26.2) (30.2) (32.0) (33.5)

12 50 54 57 60 64 77 88 94 100

(3.7) (15.2) (16.5) (17.4) (18.3) (19.5) (23.5) (26.8) (28.7) (30.5)

15

(4.6) (13.7) (14.6) (15.2) (16.2) (19.5) (22.6) (24.1) (25.6)

20

(6.1) (13.4) (14.3) (17.7) (20.1) (21.6) (22.9)

60° 8 75 80 85 90 95 110 125 130 138

(2.4) (22.9) (24.4) (25.9) (27.4) (29.0) (33.5) (38.1) (39.6) (42.1)

10 65 70 75 79 83 95 109 115 120

(3.0) (19.8) (21.3) (22.9) (24.1) (25.3) (29.0) (33.2) (35.1) (36.6)

12 60 64 68 72 76 84 100 103 108

(3.7) (18.3) (19.5) (20.7) (21.9) (23.2) (25.6) (30.5) (31.4) (32.9)

15 50 54 56 61 65 71 85 88 94

(4.6) (15.2) (16.5) (17.1) (18.6) (19.8) (21.6) (25.9) (26.8) (28.7)

20

(6.1) (14.9) (15.8) (16.8) (18.0) (19.8) (23.5) (24.7) (25.9)

90°* 15 30 x 25 35 x 30 40 x 35 45 x 40 50 x 40 60 x 45 70 x 45 80 x 50 100 x 50

(4.6) (9.1) (7.6) (10.7) (9.1) (12.2) (10.7) (13.7) (12.2) (15.2) (12.2) (18.3) (13.7) (21.3) (13.7) (24.4) (15.2) (30.5) (15.2)

20

(6.1) (12.2) (10.7) (17.1) (12.2) (19.8) (12.2) (21.3) (13.7) (24.4) (13.7)

25

(7.6) (15.2) (10.7) (18.3) (10.7) (19.8) (12.2) (22.9) (12.2)

30

(9.1) (16.8) (10.7) (18.3) (10.7) (19.8) (12.2)

100,000 125,000 150,000 175,000 200,000 250,000 300,000 350,000 400,000

Approximate Distance of Heat Throw - Feet (Meters)

NR NR

NR NR NR NR

NR

NR NR NR

NR

NR NR NR NR

NR NR NR NR NR

NR NR NR NR NR NR

45 48 50 53 64 74 79 84

49 52 55 59 65 77 81 85

45 49 52 60 70 74 80

UNIT SIZE BTU/Hr

46 54 63 66 70

44 47 58 66 71 75

40 x 35 56 x 40 65 x 40 70 x 45 80 x 45

50 x 35 60 x 35 65 x 40 75 x 40

55 x 35 60 x 35 65 x 40

8 GBNE-SVX001A-EN

Installation (continued)

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.

NOTICE: Unit Heater sizing should be based on heat loss
calculations where the unit heater output equals or exceeds
heat loss.

CLEARANCES: Each Gas Unit Heater shall be located with
respect to building construction and other equipment so
as to permit access to the Unit Heater. Clearance between
vertical walls and the vertical sides of the Unit Heater shall
be no less than 6" (152mm). To ensure access to the control
box, a minimum of 18" (457mm) is required for the control
box side. A minimum clearance of 6" (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" (305mm) from any combustible. The distance between
rear of unit and vertical wall should be no less than 18"
to maintain inlet air flow. The distance between the flue
collector and any combustible must be no less than 6"
(152mm). Also see AIR FOR COMBUSTION and VENTING
sections.

WARNING

Ensure that all hardware used in the suspension of each unit heater
is more than adequate for the job. Failure to do so may result in
extensive property damage, severe personal injury, or death!

Refer to Figures 3A and 3B for suspension of units.

Figure 3A - Heater Mounting*

D2788A

* All hanging hardware and wood is not included with the unit
(To be field supplied).

Figure 3B - Heater Suspension

NOTICE: Increasing the clearance distances may be

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

WARNING

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. Failure to heed this warning may result in
property damage or personal injury!

WARNING

Make sure that the structure to which the unit heater is to be
mounted is capable of safely 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.
Failure to heed these warnings may result in property damage,
personal injury, or death.

CAUTION

Unit Heaters must be hung level from side to side and from
front to back, see Figure 3A and 3B. Failure to do so will result in
poor performance and/or premature failure of the unit.

D4804

9GBNE-SVX001A-EN

Installation (continued)

Gas Piping

WARNING

To avoid damage or possible personal injury, do not connect gas piping to this unit until a supply line pressure/leak test has been completed.
Connecting the unit before completing the pressure/leak test may damage the unit gas valve and result in a fire hazard.

WARNING

Do not rely on a shut-off valve to isolate the unit while conducting gas pressure/leak tests. These valves may not be completely shut
off, exposing the gas valve to excessive pressure and damage.

PIPE SIZING

To provide adequate gas pressure to the gas unit heater, size
the gas piping as follows:

1. Find the cu. feet/hr. by using the following formula:

1000

Cu. feet/hr. =

Input BTU/Hr.

2. Refer to Table 3. Match “Length of Pipe in Feet”
with appropriate “Gas Input - Cu. Feet/Hr.” figure. This
figure can then be matched to the pipe size at the top 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 feet (0.29kW) natural gas supply.

200,000 BTU/Hr
1,000 BTU/cu. feet

= 200 Cu. feet/hr.

Using Table 3, a 1 inch pipe is needed.

NOTICE: If more than one unit heater is to be served by the
same piping arrangement, the total cu. ft./hr. input and length
of pipe must be considered.

NOTICE: If the gas unit heater is to be fired with LP gas,
consult your local LP gas dealer for pipe size information.

NOTICE: HEATER INSTALLATION FOR USE WITH PROPANE
(BOTTLED) GAS MUST BE MADE BY A QUALIFIED L.P.
GAS DEALER OR INSTALLER. HE/SHE WILL INSURE THAT
PROPER JOINT COMPOUNDS ARE USED FOR MAKING
PIPE CONNECTIONS; THAT AIR IS PURGED FROM LINES;
THAT A THOROUGH TEST IS MADE FOR LEAKS BEFORE
OPERATING THE HEATER; AND THAT IT IS PROPERLY
CONNECTED TO THE PROPANE GAS SUPPLY SYSTEM.

Before any connection is made to the existing line supplying
other gas appliances, contact the local gas company to make
sure that the existing line is of adequate size to handle the
combined load.

NOTE: See General Safety Information section for English/
Metric unit conversion factors.

Table 3 - Gas Pipe Size

Maximum Capacity of Pipe in Cubic Feet of Gas per Hour (Cubic Meters per Hour) for Gas Pressures of 0.5 psig (3.5 kPa) or Less,
and a Pressure Drop of 0.5 Inch Water Column (124.4 Pa)
(Based on a 0.60 Specific Gravity Gas)

Nominal

Iron Internal

Pipe Size Diameter

Inch Inch

1/2 0.622 175 120 97 82 73 66 61 57 53 50 44 40 37 35
(4.96) (3.40) (2.75) (2.32) (2.07) (1.87) (1.73) (1.61) (1.50) (1.42) (1.25) (1.13) (1.05) (0.99)
3/4 0.824 360 250 200 170 151 138 125 118 110 103 93 84 77 72
(10.2) (7.08) (5.66) (4.81) (4.28) (3.91) (3.54) (3.34) (3.11) (2.92) (2.63) (2.38) (2.18) (2.04)
1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135
(19.3) (13.2) (10.6) (9.06) (8.07) (7.36) (6.80) (6.23) (5.80) (5.52) (4.96) (4.53) (4.11) (3.82)
1 1/4 1.380 1400 950 770 660 580 530 490 460 430 400 360 325 300 280
(39.6) (26.9) (21.8) (18.7) (16.4) (15.0) (13.9) (13.0) (12.2) (11.3) (10.2) (9.20) (8.50) (7.93)
1 1/2 1.610 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430
(59.5) (41.3) (33.4) (28.0) (25.5) (22.9) (21.2) (19.5) (18.4) (17.6) (15.6) (14.2) (13.0) (12.2)
2 2.067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800
(112) (77.9) (62.3) (53.8) (47.6) (43.0) (39.6) (36.8) (34.5) (32.6) (28.9) (26.9) (24.1) (22.7)

2 1/2 2.469 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280
(178) (123) (99.7) (85.0) (75.0) (68.0) (63.7) (58.0) (55.2) (52.4) (46.7) (42.5) (38.8) (36.2)
3 3.068 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280
(311) (218) (177) (150) (135) (122) (110) (105) (97.7) (92.0) (83.5) (75.0) (69.4) (64.6)
4 4.026 23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 6000 5500 5000 4600
(651) (447) (362) (309) (275) (249) (229) (212) (204) (190) (170) (156) (142) (130)

1. Determine the required Cu. Ft./Hr. by dividing the input by 1000. For SI/Metric measurements: Convert BTU/Hr. to kilowatts. Multiply
the units inputs (kW) by 0.0965 to determine Cu. Meters./Hr. 2. FOR NATURAL GAS: Select pipe size directly from the table. 3. FOR
PROPANE GAS: Multiply the Cu. Ft./Hr. value by 0.633; then, use the table. 4. Refer to the metric conversion factors listed in the General
Safety section for SI Unit measurement conversions.

Length of Pipe, Feet (meters)

10 20 30 40 50 60 70 80 90 100 125 150 175 200

(3.0) (6.1) (9.1) (12.2) (15.2) (18.3) (21.3) (24.4) (27.4) (30.5) (38.1) (45.7) (53.3) (61.0)

10 GBNE-SVX001A-EN

Installation (continued)

Pipe Installation

1. Install the gas piping in accordance with applicable local

codes.

2. Check gas supply pressure. Each unit heater must be

connected to a manifold pressure and a gas supply
capable of supplying its full rated capacity as specified
in Table 4. A field LP tank regulator must be used to limit
the supply pressure to a maximum of 14 inches W.C. (3.5
kPa). All piping should be sized in accordance with the
latest edition of ANSI Standard Z223.1 (NFPA 54),
National Fuel Gas Code; in Canada, according to CSA
B149. See Tables 1 & 3 for correct gas piping size. If gas
pressure is excessive on natural gas applications, install
a pressure regulating valve in the line upstream from the
main shutoff valve.

3. Adequately support the piping to prevent strain on the

gas manifold and controls.

4. To prevent the mixing of moisture with gas, run the take-

off piping from the top, or side, of the main.

5. Standard Unit Heaters, optional two-stage units are

supplied with a combination valve which includes:
a. Manual "A" valve
b. Manual "B" valve
c. Solenoid valve
d. Pressure regulator
Pipe directly into the combination valve (see Figure 4).

6. Gas valve has a pressure test post requiring a

3/32 inch hex head wrench to read gas supply and

manifold pressures. Open 1/4 turn counterclockwise to

read, turn clockwise to close and reseat. A 5/16 inch ID

hose fits the pressure post.

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 shutoff valve

must be located external to the jacket (See Figure 4).

8. Make certain that all connections have been adequately

doped and tightened.

CAUTION

Do not over tighten the inlet gas piping into the valve. This may
cause stresses that will crack the valve!

NOTICE: Use pipe joint sealant resistant to the action of

liquefied petroleum gases regardless of gas conducted.

Figure 4 - Pipe Installation, Standard Controls

D3631C

D3631C

WARNING

Never use an open flame to detect gas leaks. Explosive condi­tions may exist which may result in personal injury or death!

The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system during any
pressure testing of that system 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 - Gas Piping Requirements

SINGLE STAGE GAS PIPING REQUIREMENTS*

GasType Natural Gas Propane (LP) Gas

Manifold 3.5 inch WC 10.0 inch WC
Pressure (0.9 kPa) (2.5 kPa)

14.0 inch WC Max. 14.0 inch WC Max.

Supply Inlet (3.5 kPa) (3.5 kPa)
Pressure

(1.2 kPa) (2.7 kPa)

*For single stage application only at normal altitudes.

5.0 inch WC Min. 11.0 inch WC Min.

WARNING

Check all pipe joints for leakage using a soap solution or other
approved method. Never use an open flame or severe personal
injury or death may occur!

11GBNE-SVX001A-EN