Bananza UHAT150 Manual

WARNING
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. DO NOT try to light any appliance.
3. DO NOT use electrical switches.
4. DO NOT use any telephone in
your building.
5. Extinguish any open flame.
6. Leave the building.
7. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
8. If you cannot reach your gas
supplier, call the Fire Department.
Fire Hazard
Keep all flammable objects, liquids and
vapors the minimum required clear-
ances to combustibles away from
heater.
Some objects will catch fire or explode
when placed close to heater.
Failure to follow these instructions can
result in death, injury or property
damage.
WARNING
Installation must be done by a contractor qualified
in the installation and service of gas-fired heating
equipment or your gas supplier.
Improper installation, adjustment, alteration, service
or maintenance can result in death, injury or
property damage. Read the Installation, Operation
and Service Manual thoroughly before installing or
servicing this equipment.
Installer
Please take the time to read and understand
these instructions prior to any installation.
Installer must give a copy of this manual to the owner.
Owner
Keep this manual in a safe place in order to provide
your service technician with necessary information.
Installation, Operation
& Service Manual
Models UHA[T][M][X][S]
150, 175, 200, 225
250, 300, 350, 400
UHA-Series
Tubular Unit Heaters
(Standard Range)
P/N BN111101NA 11/14 Rev. J
BANANZA
© 2014 Roberts-Gordon LLC
BANANZA
1100 Seven Mile Road NW
Comstock Park, MI 49321
Telephone: [phone]
Fax: [phone]
Toll Free: 800.255.3416
www.bananza.com

Manuel d’installation,
d’operation, et de service
Modèles UHA[T][M][X][S]
150, 175, 200, 225
250, 300, 350, 400
AVERTISSEMENT
POUR VOTRE SECURITE
Si vous sentez une odeur de gaz:
1. Ouvrir les fenêtres.
2. N’essayer pas d’allumer un appareil.
3. N’utiliser pas d’interrupteurs
électriques.
4. N’utiliser pas de téléphone dans votre
bâtiment.
5. Eteindre flamme nue.
6. Quitter le bâtiment.
7. Après avoir quitté le bâtiment, appelez
immédiatement votre fournisseur local
de gaz.
Suivre les instructions du fournisseur
de gaz.
8. Si vous ne pouvez pas joindre votre
fournisseur de gaz, appeler le service
d’incendie.
Risque d’incendie
Garder tous les objets, liquides ou vapeurs
inflammables à la distance minimale de
l’unité de chauffage requise avec les
matériaux combustibles.
Certains objets prendront feu ou exploseront
s’ils sont placés à proximité de l’unité de
chauffage.
Le non respect de ces instructions peut
entraîner la mort, des blessures corporelles
ou des dommages matériels.
ATTENTION
Linstallation doit être effectuée par un installateur
éprouvé/contractant qualifié dans linstallation et la
maintenance du syst me de chauffage par infrarouge
activé au gaz.
Linstallation, lajustement, laltération, le démarrage
ou lentretien inadéquat peuvent causer la mort, des
blessures ou des dégâts matériels. Lire enti rement
le manuel dinstallation, dopération et dentretien
avant linstallation ou l'entretien de cet équipement.
UHA-Series
Aérothermes tubulaire
(Gamme standard)
Installateur
Prenez le temps de lire et comprendre ces instructions
avant toute installation.
Linstallateur doit remettre au propriétaire
un exemplaire de ce manuel.
Propriétaire
Gardez ce manuel dans un endroit sûr pour
fournir des informations au réparateur
en cas de besoin.
BANANZA
1100 Seven Mile Road NW
Comstock Park, MI 49321
Téléphone: +1.616.726.8800
Fax: [phone]
Numéro sans fraís: 800.255.3416
www.bananza.com
BANANZA
P/N BN111101FC 11/14 Rev. J
© 2014 Roberts-Gordon LLC

Printed in U.S.A.
© 2014 Roberts-Gordon LLC
All rights reserved. No part of this work covered by the copyrights herein may be reproduced
or copied in any form or by any means - graphic, electronic, or mechanical, including
photocopying, recording, taping or information storage and retrieval systems - without the
written permission of Roberts-Gordon LLC.
TABLE OF CONTENTS
SECTION 1: Heater Safety......................................................1
1.1 Manpower Requirements .............................................1
1.2 Safety Labels and Their Placement..............................1
1.3 California Proposition 65 ..............................................1
SECTION 2: Installer Responsibility .....................................4
2.1 Wall Tag .......................................................................4
2.2 Corrosive Chemicals....................................................4
2.3 National Standards and Applicable Codes...................4
SECTION 3: Critical Considerations .....................................5
3.1 Basic Information .........................................................5
3.2 Manufactured Units......................................................5
3.3 Location and Suspension ............................................5
3.4 Minimum Required Installation Clearances .................5
3.5 Ventilation ....................................................................5
3.6 Gas Supply ..................................................................5
3.7 Electrical Supply ..........................................................5
3.8 Vent..............................................................................5
SECTION 4: Clearances TO combustibles ............................6
4.1 Required Clearances to Combustibles.........................6
4.2 Clearances to Combustibles ........................................6
SECTION 5: National Standards and Applicable Codes......8
5.1 Gas Codes...................................................................8
5.2 Aircraft Hangars ...........................................................8
5.3 Parking Structures and Repair Garages ......................8
5.4 Electrical ......................................................................8
5.5 Venting .........................................................................8
5.6 High Altitude.................................................................8
SECTION 6: Heater installation..............................................9
6.1 General ........................................................................9
6.2 Suspension..................................................................9
SECTION 7: Venting .............................................................. 10
7.1 Venting........................................................................ 10
7.2 Vent Installation .......................................................... 10
7.3 Horizontal Venting....................................................... 11
7.4 Vertical Venting ........................................................... 11
7.5 Maximum Vent Lengths Table..................................... 11
7.6 Vent Material............................................................... 11
7.7 Replacing an Existing Heater in a Venting System ..... 11
SECTION 8: Air Supply......................................................... 17
8.1 Separated Combustion Installation ............................ 17
8.2 Building Ventilation..................................................... 17
8.3 Outside Combustion Air Supply ................................. 17
SECTION 9: Gas Piping ........................................................ 18
9.1 Connections............................................................... 18
SECTION 10: Wiring ..............................................................20
10.1 Positioning Thermostats...........................................20
10.2 Low Voltage Thermostat for Models UHA[T][M][X][S]
150-400 .....................................................................21
10.3 UHA[X][S] Series Internal Wiring Diagram for Single
Stage Gas Valves ......................................................22
10.4 UHA[X][S] Series Ladder Wiring Diagram for Single
Stage Gas Valves ......................................................23
10.5 UHA[T][X][S] Series Internal Wiring Diagram for Two
Stage Gas Valves ......................................................24
10.6 UHA[T][X][S] Series Ladder Wiring Diagram for Two
Stage Gas Valves...................................................... 25
10.7 UHA[M][X][S] Series Internal Wiring Diagram for
Modulating Gas Valves ............................................. 26
10.8 UHA[M][X][S] Series Ladder Diagram for Modulating
Gas Valves ................................................................ 27
10.9 Electrical Connection to the Heater......................... 28
SECTION 11: Operation and Maintenance ......................... 29
11.1 Pre-Start-Up Checks ................................................ 29
11.2 Begin Start-Up ......................................................... 30
11.3 Pressure Switch........................................................ 34
11.4 Turning Off the Heater .............................................. 34
11.5 External Controls...................................................... 34
11.6 Complete the Start-Up ............................................. 34
11.7 Instruction to the User.............................................. 34
SECTION 12: User Instructions........................................... 35
12.1 Heater Operation..................................................... 35
12.2 Lighting Instructions ................................................ 35
12.3 Simple Troubleshooting ........................................... 35
SECTION 13: Servicing ........................................................ 37
13.1 Servicing Instructions.............................................. 37
13.2 Burner Maintenance................................................ 37
13.3 Fan/Motor Assembly Maintenance .......................... 37
13.4 Heat Exchanger Maintenance ................................. 38
13.5 Gas Valve Maintenance........................................... 38
13.6 Flue Blower ............................................................. 38
13.7 Venting and Air Intake Pipe ..................................... 38
13.8 Maintenance Checklist ............................................ 38
SECTION 14: Troubleshooting............................................. 41
14.1 General.................................................................... 42
14.2 Troubleshooting For Automatic Ignition Burner
Systems ................................................................ 43
14.3 Troubleshooting for Flame Supervision System....... 44
14.4 Troubleshooting for Gas Valves ............................... 45
14.5 Troubleshooting for Flue Blower .............................. 45
SECTION 15: Replacement Parts ........................................ 46
15.1 Gas Valve ................................................................ 46
15.2 Burner Compartment for Models
UHA[T][M][X][S] 150-400 ...................................... 47
15.3 Ignition Electrode and Flame Probe for Models
UHA[T][M][X][S] 150-400 ...................................... 49
15.4 Heat Exchanger....................................................... 50
15.5 Louvers and Louver Spring ..................................... 50
15.6 Flue Blower for Models UHA[T][M][X][S] 150-300 .. 51
15.7 Flue Blower for Models UHA[T][M][X][S] 350-400 .. 52
15.8 Pressure Switch....................................................... 53
15.9 Ignition Control ........................................................ 53
15.10 Axial Fan/Guard/Motor Assembly........................... 53
15.11 Limit Switches........................................................ 54
SECTION 16: Specifications ................................................ 55
16.1 Dimension Data for Models
UHA[T][M][X][S] 150-250 ...................................... 55
16.2 General Technical Data Table .................................. 56
16.3 Technical Data Table................................................ 56

16.4 Dimension Data for Models
UHA[T][M][X][S] 300-400 .................................. 57
16.5 General Technical Data Table .................................. 58
16.6 Technical Data Table ................................................ 58
SECTION 17: The BANANZA®UHA-Series Warranty.......... 59

TABLE OF FIGURES
Figure 1: UHA[T][M][X][S]150 - 250 Label Placement ..............2
Figure 2: UHA[T][M][X][S]300 - 400 Label Placement ..............3
Figure 3: Installation Clearances and Clearances to
Combustibles ..........................................................7
Figure 4: Suspension Methods .................................................9
Figure 5: Vent and Roof Detail ................................................ 12
Figure 6: Standard Vented Heater - Vertical and Horizontal
Vent Termination.................................................... 13
Figure 7: Standard Vented Heater - Common Vertical Vent
Termination .............................................................. 14
Figure 8: Separated Combustion Heater - Vertical and
Horizontal Vent Termination .................................. 15
Figure 9: Concentric Vent Box................................................. 15
Figure 10: Concentric Vertical and Horizontal Vent
Termination - Separated Combustion Heater ........ 16
Figure 11: Gas Connection...................................................... 19
Figure 12: Automatic Burner Control Sequence......................30
Figure 13: Single Stage Gas Valve for Models
UHA[X][S] 150 - 400 .............................................31
Figure 14: Two Stage Gas Valve for Models
UHA[T][X][S] 150 - 400 .........................................31
Figure 15: Modulating Gas Valve for Models
UHA[M][X][S] 150 - 400 ........................................32
Figure 16: LED Diagnostic Codes ...........................................36
There are references in this manual to various trademarks. All trademarks mentioned herein, whether registered or not, are the
property of their respective owners. Bananza is not sponsored by or affiliated with any of the trademark or registered
trademark owners, and makes no representations about them, their owners, their products or services.

SECTION 1: HEATER SAFETY
1 of 59
SECTION 1: HEATER SAFETY
Your Safety is Important to Us!
This symbol is used throughout
the manual to notify you of
possible fire, electrical or burn
hazards. Please pay special
attention when reading and
following the warnings in these
sections.
Installation, service and, at a
minimum, annual inspection of heater must be done
by a contractor qualified in the installation and
service of gas-fired heating equipment.
Read this manual carefully before installation,
operation or service of this equipment.
Heaters are not approved for residential installation.
These instructions, the layout drawing, local codes
and ordinances and applicable standards that apply
to gas piping, electrical wiring, venting, etc. must be
thoroughly understood before proceeding with the
installation.
Protective gear is to be worn during installation,
operation and service in accordance to the
Occupational Safety and Health Administration
(OSHA). Gear must be in accordance to NFPA 70E,
latest revision when working with electrical
components. Thin sheet metal parts have sharp
edges. To prevent injury, the use of work gloves is
recommended.
Before installation, check that the local distribution
conditions, nature of gas and pressure and
adjustment of the equipment are compatible.
The heater must be applied and operated under the
general concepts of reasonable use and installed
using the best building practices.
This equipment is not intended for use by persons
(including children) with reduced physical, sensory
or mental capabilities, or lack of experience and
knowledge, unless they have been given
supervision or instruction concerning use of the
equipment by a person responsible for their safety.
Children should be supervised to ensure that they
do not play with the equipment.
For additional copies of the Installation, Operation
and Service Manual, please contact Bananza.
1.1 Manpower Requirements
To prevent personal injury and damage to the
heater, two persons will be required for installation.
1.2 Safety Labels and Their Placement
Product safety signs or labels should be replaced by
the product user when they are no longer legible.
Please contact Bananza or your BANANZA®
independent distributor to obtain replacement signs
or labels. See Page 2, Figure 1 through Page 3,
Figure 2.
1.3 California Proposition 65
In accordance with California Proposition 65
requirements, a warning label must be placed in a
highly visible location on the outside of the
equipment (i.e. near equipment's serial plate). See
label placement drawing on Page 2, Figure 1
through Page 3, Figure 2 for label location. Avoid
placing label on areas with extreme heat, cold,
corrosive chemicals or other elements. To order
additional labels, please contact Bananza or your
BANANZA®independent distributor.

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
2 of 59
Figure 1: UHA[T][M][X][S]150 - 250 Label Placement
*For separated combustion units only.
**For modulating units only.
Description Part Number
Logo Label 91031103
Cut Hazard Label 91010430
Vent Length Label 91039505
Vent to Outdoors Label 91010427
Warning Label 91010429
Rating Plate Label 91010417
Installation Label 91010431
Instruction Location Label 91010433
Lighting Instruction Label 91010425
Venting Arrangement Label* 91010426
Proposition 65 Label 91070015
0-10VDC Modulating Label** 91040196

SECTION 1: HEATER SAFETY
3 of 59
Figure 2: UHA[T][M][X][S]300 - 400 Label Placement
*For separated combustion units only.
**For modulating units only.
Description Part Number
Logo Label 91031103
Cut Hazard Label 91010430
Vent Length Label 91039505
Vent to Outdoors Label 91010427
Warning Label 91010429
Rating Plate Label 91010417
Installation Label 91010431
Instruction Location Label 91010433
Lighting Instruction Label 91010425
Venting Arrangement Label* 91010426
Proposition 65 Label 91070015
0-10VDC Modulating Label** 91040196

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
4 of 59
SECTION 2: INSTALLER RESPONSIBILITY
The installer is responsible for the following:
• To install the heater, as well as the gas and
electrical supplies, in accordance with applicable
specifications and codes. Bananza recommends
the installer contact a Local Building Inspector or
Fire Marshal for guidance.
• To use the information given in a layout drawing
and in the manual together with the cited codes
and regulations to perform the installation.
• To install the heater in accordance with the
clearances to combustibles.
• To furnish all needed materials not supplied as
standard equipment.
• To plan location of supports, vents and air
intakes.
• To provide access for servicing.
• To provide the owner with a copy of this
Installation, Operation and Service Manual.
• To never use heater as support for a ladder or
other access equipment and never hang or
suspend anything from heater.
• To ensure there is adequate air circulation
around the heater and to supply air for
combustion, ventilation and distribution in
accordance with local codes.
• To ensure that the heater is placed in an
approved application.
2.1 Wall Tag
A laminated wall tag is included with the heater as a
permanent reminder of the safety instructions and
the importance of the required clearances to
combustibles. Affix the tag by peeling off the backing
of the adhesive strips on the rear surface and
position the tag on a wall near the heater.
A copy of the wall tag (P/N 91040034) is illustrated
on the back cover.
Know your model number and installed
configuration. Model number and installed
configuration are found on the heater serial plate
and throughout the Installation, Operation and
Service Manual.
2.2 Corrosive Chemicals
CAUTION
Product Damage Hazard
Do not use equipment in area containing
corrosive chemicals.
Refer to appropriate Material Safety Data
Sheets (MSDS).
Failure to follow these instructions can result
in product damage.
Bananza cannot be responsible for ensuring that all
appropriate safety measures are undertaken prior to
installation; this is entirely the responsibility of the
installer. It is essential that the contractor, the sub-
contractor, or the owner identifies the presence of
combustible materials, corrosive chemicals or
halogenated hydrocarbons* anywhere in the
premises.
* Halogenated Hydrocarbons are a family of chemical
compounds characterized by the presence of halogen ele-
ments (fluorine, chlorine, bromine, etc.). These compounds are
frequently used in refrigerants, cleaning agents, solvents, etc. If
these compounds enter the air supply of the burner, the life
span of the heater components will be greatly reduced. An out-
side air supply must be provided to the burners whenever the
presence of these compounds is suspected. Warranty will be
invalid if the heater is exposed to halogenated hydrocarbons.
2.3 National Standards and Applicable Codes
All equipment must be installed in accordance with
the latest revision of the applicable standards and
national codes. This refers also to the electric, gas
and venting installation. Note: Additional standards
for installations in public garages, aircraft hangars,
etc. may be applicable. See Page 8, Section 5.

SECTION 3: CRITICAL CONSIDERATIONS
5 of 59
SECTION 3: CRITICAL CONSIDERATIONS
3.1 Basic Information
UHA[T][M][X][S] heaters have automatic ignition
burners for ON/OFF, HIGH/LOW or modulate within
the range of HIGH/LOW operation.
3.2 Manufactured Units
Gas-fired, power-vented unit heater with tubular heat
exchanger. Units shall have a minimum of 82%
thermal efficiency. The standard unit shall consist of
a non-separated combustion design with an
aluminized heat exchanger and single stage gas
valve. Design and heat exchanger alternatives shall
be offered as follows:
• Separated Combustion: [S] A separated
combustion unit shall consist of a sealed
enclosure with a hinged door. Combustion air
inlet on rear of heater allows for intake venting
from outside of heated space to be attached.
Combustion flue gases shall be ducted from
outside heated space by ductwork connected to
unit’s outlet flange.
• Stainless Steel Heat Exchanger: [X] A stainless
steel heat exchanger unit shall consist of heat
exchanger tubes, heat exchanger tube supports
and heat exchanger tube plate produced of 409
stainless steel. Air inlet temperatures below 40
°F (4.5 °C) are not recommended for this
application.
• Two Stage Gas Valve: [T] A two-stage gas valve
shall allow heater to function in either high or low
fire.
• Modulating Gas Valve: [M] A modulating gas
valve shall allow heater to modulate between
high and low fire.
3.3 Location and Suspension
All models:
• Must be installed indoors.
• Must be installed in a level position with
horizontal discharge.
• May be mounted on a shelf of non-combustible
material.
• May be suspended from above (See Page 9,
Figure ) or from wall brackets of sufficient
strength to support the heater as listed in the
Technical Data Table on Page 56, Section 16.2
and Page 58, Section 16.5.
• Drop rods must be a minimum of 3/8" diameter
mild steel. Four suspension points (3/8" nuts)
are located on top of the heater.
• Must be installed in a manner which allows
access to all serviceable components.
3.4 Minimum Required Installation Clearances
Clearances around the heater and vent must be as
indicated on Page 7, Figure 3 and Page 10, Section
7to ensure access for servicing and correct
operation.
3.5 Ventilation
It is important to ensure that there is adequate air
space around the heater to supply air for
combustion, ventilation and distribution in
accordance with local and national codes on Page
10, Section 7.
3.6 Gas Supply
It is important that the gas supply pipe is sized
correctly to provide the inlet pressure as stated on
the heater serial plate. The gas supply pipe and
electrical connections must not support any of the
heater's weight. See Page 18, Section 9.
3.7 Electrical Supply
A permanent 120 V / 1 Ø / 60 Hz electrical supply is
required for the main electrical power. The heater
also requires suitable controls in accordance with
Page 20, Section 10.
3.8 Vent
Choose heater orientation to allow for the proper
location of the vent. Each heater must be fitted with
a correctly sized sealed vent system.
If vented horizontally, no other equipment may be
connected to the vent. See Page 10, Section 7.

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
6 of 59
SECTION 4: CLEARANCES TO COMBUSTIBLES
4.1 Required Clearances to Combustibles
WARNING
Fire Hazard
Keep all flammable objects, liquids and
vapours the minimum required clearances to
combustibles away from heater.
Some objects will catch fire or explode when
placed close to heater.
Failure to follow these instructions can result
in death, injury or property damage.
Clearances are the required distances that
combustible objects must be away from the heater
to prevent a fire hazard. Combustibles are materials
that may catch on fire and include common
items such as wood, paper, rubber, fabric, etc.
Maintain clearances to combustibles at all times for
safety.
Clearances for all heater models are located on the
serial plate of the heater and throughout the manual.
Check the clearances on the serial plate to make
sure the product is suitable for your application and
the clearances are maintained. Read and follow the
safety guidelines below:
• Keep gasoline or other combustible material
including flammable objects, liquids, dust or
vapors away from this heater or any other
equipment.
• Do not spray aerosols in the vicinity of this
heater.
• The stated clearances to combustibles
represents a surface temperature of 90° F
(50° C) above room temperature. Building
materials with a low heat tolerance (such as
plastics, vinyl siding, canvas, tri-ply, etc) may be
subject to degradation at lower temperatures. It
is the installer’s and owner’s responsibility to
assure that adjacent materials are protected from
degradation.
• Maintain clearances from heat sensitive
equipment and workstations.
• Consult local Fire Marshal, Fire Insurance Carrier
or other authorities for approval of proposed
installation when there is a possibility of
exposure to combustible airborne materials or
vapors.
4.2 Clearances to Combustibles
Clearances must be as indicated on Page 7, Figure
3. If clearances to combustibles are not indicated,
then installation clearances apply.

SECTION 4: CLEARANCES TO COMBUSTIBLES
7 of 59
Figure 3: Installation Clearances and Clearances to Combustibles
6"
(15 cm)
31"**
(79 cm)
3"
(8 cm)
6"
(15 cm)
Clearances to Combustibles
6"
(15 cm)
24" (61 cm) for
adequate
air flow access
axial fan.
10'
(3 m)
Wall
Terminal
Roof Terminal
Top
18' (5.5 m) - 20' (6.1 m)
Max. Mounting Height*
Installation Clearances
(Optional separated
combustion concentric
venting shown.)
* Recommended mounting height varies with heater input.
Heaters may be mounted at a higher level if destratification
fans are installed.
For Models UHA 150-400 venting directly from top of heater is
not applicable; For roof terminal vent, elbow duct off back of
heater is required.
Clearance to Vent: 2" (5 cm)
**31" (79 cm) minimum is necessary
for servicing.
The heater must always be installed at least 6' (1.8 m) above the floor.
The vent pipe must have clearance from combustibles by 2" (5 cm).
If installed at low levels where individuals can come in contact with hot heat exchanger components,
adequate guarding must be provided.
All distances are minimum clearance requirments for service access, airflow and safety.

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
8 of 59
SECTION 5: NATIONAL STANDARDS AND APPLICABLE CODES
5.1 Gas Codes
The type of gas appearing on the serial plate
must be the type of gas used. Installation must
comply with national and local codes and
requirements of the local gas company.
United States: Refer to NFPA 54/ANSI Z223.1 -
latest revision, National Fuel Gas Code.
Canada: Refer to CSA B149.1 Natural Gas and
Propane Installation Code.
5.2 Aircraft Hangars
Installation in aircraft hangars must be in
accordance with the following codes:
United States: Refer to Standard for Aircraft
Hangars, NFPA 409 - latest revision.
Canada: Refer to Natural Gas and Propane
Installation Code, Standard CSA B149.1 - latest
revision.
5.3 Parking Structures and Repair Garages
Installation in garages must be in accordance
with the following codes:
United States: Refer to Standard for Parking
Structures, NFPA 88A - latest revision or the
Code for Motor Fuel Dispensing Facilities and
Repair Garages, NFPA 30A - latest revision.
Canada: Refer to Natural Gas and Propane
Installation Code, Standard CSA B149.1 - latest
revision.
5.4 Electrical
The heater must be electrically grounded in
accordance with the following codes:
United States: Refer to National Electrical
Code®, NFPA 70 - latest revision. Wiring must
conform to the most current National Electrical
Code®, local ordinances and any special
diagrams furnished.
Canada: Refer to Canadian Electrical Code,
CSA C22.1 Part 1 - latest revision.
5.5 Venting
The venting must be installed in accordance
with the requirements within this manual and
the following codes:
United States: Refer to NFPA 54/ANSI Z223.1 -
latest revision, National Fuel Gas Code.
Canada: Refer to CSA B149.1 Natural Gas and
Propane Installation Code.
5.6 High Altitude
These heaters are approved (without modifications)
for installations up to 2000' (610 m) in US and
Canada. Heaters installed above 2000' (610 m)
must be de-rated. For installations above 2000' (610
m) in US, consult factory for information on burner
de-rating. For installations from 2000' (610 m) to
4500' (1370m) in Canada, high altitude conversion
kits are available. Heaters installed over 4500'
(1370 m) in Canada are not approved and must be
approved by the local or provincial authority.

SECTION 6: HEATER INSTALLATION
9 of 59
SECTION 6: HEATER INSTALLATION
6.1 General
Heaters are designed for installation above 6'
(1.8 m). These heaters must be installed within the
heated space. Duct delivery systems are not
permitted with axial fan units. When handling or
supporting the heater from below, ensure that the
weight is taken at the support points.
The gas or electrical supply lines must not be used
to support the heater.
Do not locate the gas or electrical supply lines
directly over the path of the flue products from the
heater.
The heater must be installed in a location that is
readily accessible for servicing.
The heater must be installed in accordance with
clearances to combustibles as indicated on the wall
tag and in this manual.
6.2 Suspension
WARNING
Crush Hazard
Use 3/8" threaded rod
minimum.
Failure to follow these
instructions can result in
death, injury or property
damage.
For typical suspension, See Page 9, Figure 4.
Figure 4: Suspension Methods

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
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SECTION 7: VENTING
WARNING
Carbon Monoxide Hazard
Heaters must be vented
outdoors.
Heaters must be installed
according to the
installation manual.
Failure to follow these
instructions can result in
death or injury.
7.1 Venting
This heater must be vented in accordance with the
rules contained in this manual and with the following
national codes and any state, provincial or local
codes which may apply: United States: Refer to
NFPA 54/ANSI Z223.1 - latest revision, National
Fuel Gas Code; Canada: Refer to CSA B149.1
Natural Gas and Propane Installation Code.
The bottom of the vent or air intake terminal shall not
be located less than 1' (.3 m) above grade level.
The vent shall not terminate less than 7' (2.1 m)
above grade where located adjacent to public
walkways.
Vent terminal must be installed at a height sufficient
to prevent blockage by snow and building materials
protected from degradation by flue gasses.
Vent terminal must be beyond any combustible
overhang.
Secure all joints with corrosion resistant #8 x 3/8"
sheet metal screws.
For single wall venting, pressure sensitive aluminum
tape or silicone sealant must be used to seal all
joints.
Aluminum tape shall have a minimum temperature
rating of 400° F (204° C) and meet SMACNA AFTS-
100-73 standards. High temperature silicone
sealant must have a minimum temperature rating of
480° F (250° C).
7.1.1 United States Requirements
Vent must terminate at least 3' (.9 m) above any
forced air inlet located within 10' (3.1 m).
Vent must terminate at least 4' (1.2 m) below,
4' (1.2 m) horizontally from, or 1' (.3 m) above any
door, operable window, or gravity air inlet into any
building.
NFPA 54/ANSI Z223.1 - latest revision, National
Fuel Gas Code specifies a 4' (1.2 m) horizontal vent
terminal clearance from gas and electric meters,
regulators and relief equipment.
7.1.2 Canadian Requirements
The vent shall not terminate within 6' (1.8 m) of a
mechanical air supply inlet to any building.
The vent shall not terminate within 3' (.9 m) of a
window or door that can be opened in any building,
any non-mechanical air supply inlet to any building,
or of the combustion air inlet of any other piece of
equipment.
7.2 Vent Installation
Maintain clearances to combustibles at all times for
safety. Clearances are the required distances that
combustible objects must be away from the heater
to prevent serious fire hazard. See Page 7, Figure 3.
For vented units, the vent must terminate outside of
the building.
Vents must be fully sealed and correctly sized for
the model. If the vent passes through a wall or
ceiling of combustible material, it must be enclosed
by a listed thimble and be separated from the
thimble by at least a 2" (5 cm) air gap.
For separated combustion models, vents and air
intakes must be a fully sealed system and correctly
sized for the model. Vent should be assembled as
detailed on Page 12, Figure 5 through Page 16,
Figure 10. The joints between the vent terminal and
the roof or wall must be properly sealed. If the vent
passes through a wall or ceiling of combustible
material, it must be enclosed by a listed thimble and
be separated from the thimble by at least a 2" (5 cm)
air gap.
Vents and air intakes must be adequately
supported so that the heater does not bear the
weight of the pipes.
For vent termination See Page 12, Figure 5 through
Page 16, Figure 10.
7.2.1 Standard Vented Heaters
(Models UHA[T][M][X] 150-400)
The vent must be fitted with a low resistance
terminal. See Page 12, Figure 5 through Page 14,
Figure 7. Standard vented heaters do not allow
outdoor air intake for combustion air.
7.2.2 Separated Combustion Heaters
(Models UHA[T][M][X]S 150-400)
The heaters are designed to be installed as
separated combustion heaters. The vent and air
intake are run as separate pipes to the wall or roof
terminals. See Page 15, Figure 8. As an option, the
vent and air intake are run as separate pipes to a

SECTION 7: VENTING
11 of 59
concentric vent box and a concentric vent/air intake
pipe penetrates the wall or roof. See Page 15,
Figure 9 and Page 16, Figure 10.
For separated combustion installation, the vent and
air intake must be fitted with an individual and
correctly sized sealed system and the vent and air
intake must terminate at approved wall and roof
terminals.
Separated combustion units may not be common
vented.
7.3 Horizontal Venting
Horizontally vented heaters must be individually
vented, no common venting.
Vent pipe must be sloped ¼" (.6 cm) for every 1' (.3
m).
In noncombustible walls only, vent terminal
(P/N 02537801-1P) may be used.
For 4'' (10 cm) vents in either combustible or
noncombustible walls, use vent terminal (P/N
90502100) or equivalent insulated vent terminal.
Follow the manufacturer's instructions for proper
installation.
Instead of an insulated vent terminal, a listed thimble
with 2" (5 cm) air gap, may be used with a 4" (10 cm)
vent cap (P/N 90502102).
7.4 Vertical Venting
Vertically vented standard vented heaters can be
common vented (up to 4 heaters).
Vent pipe must be sloped 1/4'' (.6 cm) for every
1' (.3 m).
For 4'' (10 cm) common vent, an approved vent cap
(P/N 90502102) must be used.
For 6'' (15 cm) common vent, an approved vent cap
(P/N 90502103) must be used.
For common vertical venting of more than two
heaters, See Page 14, Figure 7.
A vent shall not extend less than 2' (.6m) above the
highest point where it passes through a flat roof of a
building.
7.5 Maximum Vent Lengths Table
Model UHA[T][M][X][S]150-400 # of Elbows
30 ft (9.1 m) 1
25 ft (7.6 m) 2
20 ft (6.1 m) 3
15 ft (4.5 m) 4
10 ft (3.0 m) 5
7.6 Vent Material
Vent material may be single wall 26 ga. (minimum)
galvanized steel or equal thickness stainless steel.
Completely seal all joints, refer to Page 10, Section
7.2.
If penetrating a combustible wall or roof, a listed
thimble with 2" (5 cm) clearance must be used.
Where local codes permit, a single section of type
B-1 vent material may be used at the roof or wall
penetration instead of a thimble. Ensure vent
manufacturer's clearance from vent material is
maintained. Seal annular space of the type B-1 vent
as well as all joints in the remaining vent.
7.7 Replacing an Existing Heater in a Venting
System
When replacing an existing heater in a venting
system, the venting system may not be properly
sized to vent the new heater. The following steps
must be followed with each piece of equipment
connected to the venting system placed in
operation, while any other equipment connected to
the venting system are not in operation.
1. Seal any unused openings in the venting
system.
2. Inspect the venting system for proper size and
horizontal pitch, as required by the NFPA 54/
ANSI Z223.1 - latest revision, National Fuel
Gas Code (US) or Standard CSA B149.1
Natural Gas and Propane Installation Code
(Canada) and these instructions. Determine
that there is no blockage or restriction, leakage,
corrosion and other deficiencies which could
cause an unsafe condition.
3. Close all building doors and windows and all
doors between the space in which the piece(s)
of equipment connected to the venting system
are located and other spaces of the building.
Turn on clothes dryers and any exhaust fans,
such as range hoods and bathroom exhausts
so that they shall operate at maximum speed.
Do not operate a summer exhaust fan. Close
fireplace dampers.
4. Follow the lighting instructions. Place the
equipment being inspected in operation. Adjust
thermostat so that the equipment will operate
continuously.
5. For any equipment having a draft hood, test for
draft hood equipment spillage at the draft hood
relief opening after five minutes of main burner
operation. Use the flame of a match or candle.
6. After it has been determined that each piece(s)
of equipment connected to the venting system
properly vents when tested as outlined above,
return doors, windows, exhaust fans, fireplace

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
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dampers and any other gas-burning piece(s) of
equipment to their previous conditions of use.
7. If improper venting is observed during any of
the above tests, the venting system must be
corrected by a contractor qualified in the
installation and service of gas-fired equipment
or your local gas supplier. If the venting must be
resized, use appropriate tables in (US)
Appendix G of NFPA 54/ANSI Z223.1 - latest
revision, National Fuel Gas Code (US) or
Standard CSA B149.1 Natural Gas and
Propane Installation Code (Canada) to
determine minimum size. All vent corrections
must be in accordance with the appropriate
local codes and the NFPA 54/ANSI Z223.1 -
latest revision, National Fuel Gas Code (US) or
Standard CSA B149.1 Natural Gas and
Propane Installation Code (Canada).
Figure 5: Vent and Roof Detail