Roberts Gorden Combat UHA-Series Service manual

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. Leave the building.
6. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
7. If you cannot reach your gas
supplier, call the Fire Department.
WARNING
Combat
®
UHA-Series
Tubular Unit Heaters
(Standard Range)
Installation, Operation
& Service Manual
Models UHA[S]
150, 175, 200, 225
250, 300, 350, 400
Fire Hazard
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
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
Installer
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.
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.
Installation must be done by a contractor qualified
in the installation and service of gas-fired heating
equipment or your gas supplier.
Keep this manual in a safe place in order to provide
your serviceman with necessary information.
Owner
Roberts-Gordon LLC
1250 William Street
P.O. Box 44
Buffalo, New York 14240-0044
Telephone: 716.852.4400
Fax: 716.852.0854
Toll Free: 800.828.7450
www.rg-inc.com
Quality in Any Language™
© 2008 Roberts-Gordon LLC
P/N 111101NA 06/08 Rev. E
TABLE OF CONTENTS
SECTION 1: Heater Safety...................................................... 1
1.1 Manpower Requirements ............................................. 1
SECTION 2: Installer Responsibility ..................................... 2
2.1 Wall Tag ....................................................................... 2
2.2 Corrosive Chemicals.................................................... 2
2.3 National Standards and Applicable Codes .................. 2
SECTION 3: Critical Considerations ..................................... 3
3.1 Basic Information ......................................................... 3
3.2 Location and Suspension ............................................ 3
3.3 Minimum Required Installation Clearances ................. 3
3.4 Clearances to Combustibles ........................................ 3
3.5 Ventilation .................................................................... 3
3.6 Gas Supply .................................................................. 3
3.7 Electrical Supply .......................................................... 3
3.8 Vent.............................................................................. 3
3.9 Separated Combustion Installation .............................. 3
SECTION 4: National Standards and Applicable Codes ..... 5
4.1 Gas Codes................................................................... 5
4.2 Aircraft Hangars ........................................................... 5
4.3 Parking Structures and Repair Garages ...................... 5
4.4 Electrical ...................................................................... 5
4.5 Venting......................................................................... 5
4.6 High Altitude ................................................................ 5
SECTION 5: Major Components ............................................ 6
5.1 General ........................................................................ 6
5.2 Suspension .................................................................. 6
SECTION 6: Venting................................................................ 7
6.1 Venting......................................................................... 7
6.2 Vent Installation ........................................................... 7
6.3 Unvented Operation..................................................... 8
6.4 Horizontal Venting........................................................ 8
6.5 Vertical Venting ............................................................ 8
6.6 Length Requirements .................................................. 8
6.7 Vent Material................................................................ 9
SECTION 7: Air Supply......................................................... 13
7.1 Separated Combustion Installation............................. 13
7.2 Unvented Installation .................................................. 13
7.3 Building Ventilation ..................................................... 13
7.4 Outside Combustion Air Supply.................................. 13
SECTION 8: Gas Piping ........................................................ 14
8.1 Connections............................................................... 14
SECTION 9: Wiring................................................................ 15
9.1 Positioning Thermostats ............................................ 15
9.2 Low Voltage Thermostat with One Heater ................. 15
9.3 UHA[S] Series Internal Wiring Diagram..................... 16
9.4 UHA[S] Series Ladder Wiring Diagram...................... 17
9.5 Electrical Connection to the Heater ........................... 18
SECTION 10: Operation and Maintenance.......................... 19
10.1 Pre-Start-Up Checks ................................................ 19
10.2 Begin Start-Up ......................................................... 19
10.3 Complete the Start-Up ............................................. 21
SECTION 11: User Instructions............................................22
11.1 User Instructions .......................................................22
11.2 Heater Operation ......................................................22
11.3 Lighting Instructions..................................................22
11.4 Simple Troubleshooting.............................................22
SECTION 12: Servicing.........................................................24
12.1 Servicing Instructions...............................................24
12.2 Burner Maintenance.................................................24
12.3 Fan/Motor Assembly Maintenance ...........................24
12.4 Heat Exchanger Maintenance ..................................24
12.5 Gas Valve Maintenance ...........................................24
12.6 Flue Blower ..............................................................24
12.7 Venting and Air Intake Pipe ......................................24
12.8 Maintenance Checklist .............................................25
SECTION 13: Troubleshooting .............................................27
13.1 General ....................................................................27
13.2 Troubleshooting For Automatic Ignition
Burner Systems .......................................................28
13.3 Troubleshooting for Flame Supervision System .......29
13.4 Troubleshooting for Gas Valves................................30
13.5 Troubleshooting for Flue Blower ...............................30
SECTION 14: Replacement Parts.........................................31
14.1 Gas Valve .................................................................31
14.2 Burner Compartment ...............................................32
14.3 Ignition Electrode and Flame Probe .........................33
14.4 Heat Exchanger .......................................................34
14.5 Louvers and Louver Spring ......................................34
14.6 Flue Blower .............................................................35
14.7 Pressure Switch........................................................36
14.8 Ignition Control .........................................................36
14.9 Axial Fan/Guard/Motor Assembly.............................36
14.10 Limit Switches ........................................................37
SECTION 15: Specifications.................................................38
15.1 Standard (Models 150 - 400) UHA[S] Series
Dimension Data .......................................................38
15.2 General Technical Data Table (All Models) ..............39
15.3 Technical Data Table (All Models) ............................39
SECTION 16: The ROBERTS GORDON® COMBAT®
UHA-Series Warranty .....................................41
© 2008 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.
Printed in U.S.A.
TABLE OF FIGURES
Figure 1: Installation Clearances and Clearances
to Combustibles ......................................................... 4
Figure 2: Suspension Methods ................................................. 6
Figure 3: Vent and Roof Detail .................................................. 9
Figure 4: Standard Vented Heater - Vertical
and Horizontal Vent Termination................................ 9
Figure 5: Standard Vented Heater - Common
Vertical Vent Termination ......................................... 10
Figure 6: Separated Combustion Heater - Vertical
and Horizontal Vent Termination.............................. 11
Figure 7: Concentric Vent Box ................................................ 11
Figure 8: Concentric Vertical and Horizontal Vent
Termination - Separated Combustion Heater .......... 12
Figure 9: Gas Connection ....................................................... 14
Figure 10: Automatic Burner Control Sequence...................... 20
Figure 11: Gas Valve for Models UHA[S] 150 - 400 ................ 20
Figure 12: LED Diagnostic Codes ........................................... 22
SECTION 1: HEATER SAFETY
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 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.
Thin sheet metal parts, including the various venting
components, have sharp edges. To prevent injury,
the use of work gloves is recommended.
Before installation, ch‘eck that the local distribution
conditions, nature of gas and pressure and
adjustment of the appliance are compatible.
1.1 Manpower Requirements
To prevent personal injury and damage to the
heater, two persons will be required for installation.
1
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
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. Roberts-Gordon
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 furnished 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.
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 91040031) is illustrated
on the back cover.
Know your model number. Model number is found
on the heater and in the Installation, Operation and
Service Manual. See Page 9, Figure 3 through Page
14, Figure 9.
2
2.2 Corrosive Chemicals
CAUTION
Do not use heater in an area containing corrosive
chemicals.
Avoid the use of corrosive chemicals to ensure a
longer life of the burner, heat exchanger and other
parts.
Failure to follow these instructions can result in
property damage.
Roberts-Gordon 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 elements (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 outside 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 appliances 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.
SECTION 3: CRITICAL CONSIDERATIONS
SECTION 3: CRITICAL CONSIDERATIONS
3.1 Basic Information
UHA[S] heaters have automatic ignition burners for
ON/OFF operation only.
3.2 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 6,
Figure 2) or from wall brackets of sufficient
strength to support the heater as listed in the
Dimension Data Table on Page 38, Section 15.1.
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.
See Page 4, Figure 1 for details.
3.7 Electrical Supply
A permanent 120 V 60 Hz 1 Ø electrical supply is
required for the main electrical power. The heater
also requires suitable controls in accordance with
See Page 15, Section 9.
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 appliance may be
connected to the vent. See Page 7, Section 6.
3.9 Separated Combustion Installation
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. See Page 7, Section 6.
3.3 Minimum Required Installation Clearances
Clearances around the heater and vent must be as
indicated on Page 4, Figure 1; Page 9, Figure 3
through Page 12, Figure 8 to ensure access for
servicing, and correct operation.
3.4 Clearances to Combustibles
Clearances must be as indicated on Page 4, Figure
1. If clearances to combustibles are not indicated,
then installation clearances apply.
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 7,
Section 6.
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 data plate. The gas supply pipe and
electrical connections must not support any of the
heater's weight on Page 14, Section 8.
3
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
WARNING
Fire Hazard
Some objects will catch fire or explode when placed
close to heater.
Keep all flammable objects, liquids and vapors the
required clearances to combustibles away from heater.
Failure to follow these instructions can result in death,
injury or property damage.
Figure 1: Installation Clearances and Clearances to Combustibles
Installation Clearances
Clearances to Combustibles
Roof Terminal
(Optional separated
combustion concentric
venting shown.)
6"
(15 cm)
Top
Wall
Terminal
24" for
adequate
air flow access
axial fan.
10'
(3 m)
3"
20' (6.0 m) - 30' (9.1 m)
Max. Mounting Height*
* Recommended mounting height varies with heater input.
Heaters may be mounted at a higher level if destratification
fans are installed.
Note: Venting directly from top of heater not applicable
on Models 150 - 400.
Clearance to Vent: 2" (5 cm)
**31" (79 cm) minimum is necessary
for servicing.
The heater must always be installed at least 6' (2 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.
4
31"
(79 cm)
6"**
(15 cm)
SECTION 4: NATIONAL STANDARDS AND APPLICABLE CODES
SECTION 4: NATIONAL STANDARDS AND APPLICABLE CODES
4.1 Gas Codes
The type of gas appearing on the name 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.
4.2 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 Standard CSA B149.1 Natural
Gas and Propane Installation Code.
• In aircraft storage and servicing areas, heaters
shall be installed at least 10' (3 m) above the
upper surface of wings or of engine enclosures
of the highest aircraft which may be housed in
the hangar. The measurement shall be made
from the wing or engine enclosure (whichever is
higher from the floor) to the bottom of the heater.
• In shops, offices and other sections of aircraft
hangars communicating with aircraft storage or
servicing areas, heaters shall be installed not
less than 8' (2.4 m) above the floor.
• Suspended or elevated heaters shall be so
located in all spaces of aircraft hangars that they
shall not be subject to injury by aircraft, cranes,
movable scaffolding or other objects. Provisions
shall be made to assure accessibility to
suspended heaters for recurrent maintenance
purposes.
4.3 Parking Structures and Repair Garages
Installation in garages must be in accordance
with the following codes:
United States: 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
CSA B149.1 Natural Gas and Propane
Installation Code.
• In accordance with the Standard for Parking
Structures NFPA 88A, heaters must be located
a minimum of 18" (50 cm) below the floor-ceiling
assembly or 18" (50 cm) above the floor.
• In accordance with the Code for Motor Fuel
Dispensing Facilities and Repair Garages,
NFPA 30A - latest revision, heaters must not be
installed less than 8' (2.4 m) above the floor.
4.4 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.
4.5 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.
4.6 High Altitude
These heaters are approved for installations up
to 2000' (610 m). In USA, consult factory if
heater is to be installed above 2000' (610 m). In
Canada, high altitude conversion kits are
available for installations up to 4500' (1370 m).
Installations above 4500' (1370 m) in Canada is
by local or provincial authority.
5
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 5: MAJOR COMPONENTS
5.1 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.
5.2 Suspension
WARNING
Crush Hazard
Use 3/8" threaded rod
minimum.
Failure of the supports can
result in death, injury
or property damage.
For typical suspension, See Page 6, Figure 2.
Figure 2: Suspension Methods
Unistrut
Channel Nut
Ensure all suspension
hardware is torqued to
a minimum of 20 ft lbs.
Washer
Nut
3/8"
Threaded
Rod
Cone Point
Set Pin
Window
Clamp
3/8"
Threaded
Rod
Unistrut
Nut
Washer
Riv
Nut
Support Points
6
SECTION 6: VENTING
SECTION 6: VENTING
6.1 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.
Any portion of vent pipe passing through a
combustible wall must have a listed thimble to
conform with the above codes.
The heater may be installed unvented in
certain circumstances according to building
ventilation codes. Refer to the above codes and
Page 8, Section 6.3 for further information.
Unvented operation also requires compliance with
the clearances to combustibles given on Page 4,
Figure 1.
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 AFTS100-73 standards. High temperature silicone
sealant must have a minimum temperature rating of
480° F (250° C).
6.1.1 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.
6.1.2 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 appliance.
6.2 Vent Installation
WARNING
Fire Hazard
Some objects will catch fire or explode when placed
close to heater.
Keep all flammable objects, liquids and vapors the
required clearances to combustibles away from heater.
Failure to follow these instructions can result in death,
injury or property damage.
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 9, Figure 3 through Page 12,
Figure 8. 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 9, Figure 3 through
Page 12, Figure 8.
6.2.1 Standard Vented Heaters
(Models UHA 150 - 400)
The vent must be fitted with a low resistance
terminal. See Page 9, Figure 3 through Page 9,
Figure 4. Standard vented heaters do not allow
outdoor air intake for combustion air.
7
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
6.2.2 Separated Combustion Heaters
(Models UHAS 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 12, Figure 8. As an option, the
vent and air intake are run as separate pipes to a
concentric vent box and a concentric vent/air intake
pipe penetrates the wall or roof.
6.3 Unvented Operation
WARNING
Carbon Monoxide Hazard
Heaters installed unvented must
be interlocked with sufficient
building exhaust.
Heaters must be installed
according to the installation
manual.
Failure to follow these
instructions can result in death
or injury.
For unvented operation in commercial installations,
sufficient ventilation must be provided in the amount
of 4 cfm per 1000 Btu/h firing rate (United States); 3
cfm per 1000 Btu/h firing rate (Canada).
WARNING: Combustion by-products contain a
chemical known to the State of California to cause
cancer and birth defects or other reproductive
harm.
6.4 Horizontal Venting
Horizontally vented heaters must be individually
vented.
Vent pipe must be sloped ¼" (.6 cm) for every 1' (.3
m). For vent lengths greater than 5' (1.5 m),
condensation will form. Insulation is recommended
and condensation drains may be desired. For vents
pitched up toward the vent terminal, place the
condensation drain within 5' (1.5 m) of the heater.
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" air gap) may be used with a 4" vent cap (P/N
90502102).
8
6.5 Vertical Venting
Vertically vented heaters can be common vented
(up to 4 heaters).
For vent lengths greater than 5' (1.5 m),
condensation will form. Insulation is recommended
and condensation drains may be desired. Vent from
the rear of the heater cabinet then run the vent
vertically and use a condensate drain at the bottom
of the vertical vent.
Vent pipe must be sloped 1/4'' (.6 cm) for every
1' (.3 m).
For 4'' (10 cm), 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 10, Figure 5.
A vent shall not extend less than 2' (.6m) above the
highest point where it passes through a flat roof of a
building.
6.6 Length Requirements
If using vent lengths greater than 5' (1.5 m),
condensation will form in the vent pipe. Insulation
and additional sealing measures (high temperature
silicone at all seams) are required.
The entire vent should be insulated with foil faced
fiberglass insulation (1/2" thick, 1-1/2# density
minimum).
Maximum Vent Lengths Table
Model UHA[S]
150 - 400
40 ft (12.2 m)
35 ft (10.7 m)
30 ft (9.1 m)
25 ft (7.6 m)
20 ft (6.1 m)
# of Elbows
1
2
3
4
5
SECTION 6: VENTING
Figure 3: Vent and Roof Detail
6.7 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 7, Section
6.2.
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.
Vent
Terminal
Flashing
or Rain Collar
Roof
Listed Thimble
2" Air Gap to
Combustible Material
Vent
Figure 4: Standard Vented Heater - Vertical and Horizontal Vent Termination
Vent Terminal
Flashing
(By Others)
Listed
Thimble
(2" Clearance)
4" Dia.Vent
Vertical
Option
90°
Bend
Horizontal
Option
Listed
Thimble
(2" Clearance)
Flashing
(By Others)
Vent
Condensate
Trap to Drain
(Optional)
Model
UHA 150 - 400
Vent Diameter
4" (10 cm)
Vent
Terminal
12" (31 cm)
Minimum
Note: Vent supports
not shown.
Part Number
90502102
9
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
Figure 5: Standard Vented Heater - Common Vertical Vent Termination
Type "B" vent cap
(7" or 8") may be used.
(These are not available
from Roberts-Gordon.)
Type "B" Vent Pipe
SIDE VIEW
Roof
Flashing
18" (46 cm)
Min.
Roof
The last section of vent pipe
passing through the roof or
wall may be Type "B" vent pipe.
All other vent materials in the
building must be single wall
vent pipe.
4" (10 cm)
Single Wall Pipe
TOP VIEW
10
Approved
Thimble
(If Applicable)
Single Wall Pipe
"D"
"D" Area must equal sum
of open area of
individual vents.
4" (10 cm)
Single Wall Pipe
SECTION 6: VENTING
Figure 6: Separated Combustion Heater - Vertical and Horizontal Vent Termination
12" (31 cm)
Minimum from air inlet to vent
termination (may be horizontal
or vertical clearance).
Air Intake*
Vent
Vertical
Option
90°
Bend
Horizontal
Option
Air Intake
12" (31 cm)
Minimum from air inlet to vent
termination (may be horizontal
or vertical clearance).
Air Intake
Termination
Vent
Termination
Vent
Model
UHAS 150 - 400
Model
UHAS 150 - 250
UHAS 300 - 400
Vent Diameter
4" (10 cm)
*Air Intake Diameter
4" (10 cm)
5" (13 cm)
Terminal P/N
90502102
Terminal P/N
90502102
90502105
Condensate
Trap to Drain
(Optional)
Listed Thimble through
Combustible Wall
12" (31 cm)
Minimum from wall
to vent termination.
Note: Vent supports not shown
Figure 7: Concentric Vent Box
11
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
Figure 8: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater
Vent Terminal
with Baffle Plate
4" Type B-1
Vent
UHA 150-250:
6" Dia. Single Wall
UHA 300-400:
8" Dia. Single Wall
Storm Collar (By Others)
(Attach with 3 sheet metal screws.)
Combustion
Air Terminal
Flashing
(By Others)
Concentric
Vent Box
6" (16 cm)
Minimum
12" (31 cm)
Maximum
Air Intake*
Vertical
Option
10' (3 m)
Maximum
Vent
Condensate Trap
to Drain (Optional)
Air Intake*
Horizontal
Option
Vent
Concentric
Vent Box
Description
Concentric Vent Kit (150 - 250)
Concentric Vent Box Top & Side Assembly
Concentric Vent Box Bottom Assembly
Screw #6 x 3/8 Self Drilling
4" Vent Terminal with Baffle Plate
6" Combustion Air Terminal
Part Number
UHVK1
90504113
90504112
91119100
90502102R
90502103
Qty.
Description
Concentric Vent Kit (300 - 400)
Concentric Vent Box Top & Side Assembly
Concentric Vent Box Bottom Assembly
Screw #6 x 3/8 Self Drilling
4" Vent Terminal with Baffle Plate
8" Combustion Air Terminal
Part Number
UHVK2
90504013
90504012
91119100
90502102R
90502104
Qty.
12
1
1
14
1
1
1
1
14
1
1
4"
Type
B-1
Vent
Combustion
Air Terminal
Model
UHAS 150 - 400
Model
UHAS 150 - 250
UHAS 300 - 400
Vent Terminal
with Baffle Plate
Storm Collar (By Others)
(Attach with 3
sheet metal screws.)
Vent Diameter
4" (10 cm)
*Air Intake Diameter
4" (10 cm)
5" (13 cm)
SECTION 7: AIR SUPPLY
SECTION 7: AIR SUPPLY
7.1 Separated Combustion Installation
When installed as a separated combustion heater
(UHAS), the air for combustion is drawn in from
outside the building. It is important to ensure that
there is adequate space around heater to provide air
for the axial air distribution fan.
7.2 Unvented Installation
It is important to ensure that there is adequate fresh
air supply at all times for both combustion and
heating requirements in accordance with local and
national codes.
WARNING: Combustion by-products contain a
chemical known to the State of California to cause
cancer and birth defects or other reproductive
harm.
7.3 Building Ventilation
Where ventilation is required, air must be taken from
an outside point where it is not likely to be
contaminated or obstructed.
7.4 Outside Combustion Air Supply
If outside combustion air supply is required,
separated combustion model (UHAS) heaters must
be used.
IMPORTANT: If the building has a slight negative
pressure or corrosive contaminants such as
halogenated hydrocarbons are present in the air, an
outside combustion air supply to the heater is
required. Seal all combustion air pipe joints.
The air supply duct may have to be insulated to
prevent condensation on the outer surface. The
outside air terminal must not be more than 1' (31
cm) above the vent terminal.
7.4.1 Length Requirements
Follow the constraints listed on Page 8, Section 6.6.
13
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 8: GAS PIPING
WARNING
Fire Hazard
Hazard
Fire
Connect
to to
Figure
9. 9.
Connectgas
gassupply
supplyaccording
according
Figure
Gas
properly.
Gascan
canleak
leakififnot
notinstalled
installed
properly.
Failure
Failureto
tofollow
followthese
theseinstructions
instructionscan
canresult
resultinindeath,
death,
injury
injuryor
orporperty
propertydamage.
damage.
It is important that the gas supply pipe and the
electrical connections do not support any of the
heater’s weight.
A gas meter is connected to the service pipe by the
gas supply company. An existing meter should be
checked, preferably by the company, to ensure that
the meter is adequate for the rate of gas supply
required.
Installation pipes must be fitted in accordance with
local and national codes. Pipes of smaller size than
the heater inlet gas connection should not be used.
8.1 Connections
Connect the heater to the gas supply ensuring that
the final connections are as follows:
• Gas supply pipe work is run in medium or heavy
gauge tubing in compliance with local and
national codes.
• Meter and service must be large enough to
handle all the burners being installed plus any
other connected load. The gas pipe which feeds
the system must be large enough to supply the
required gas with a maximum pressure drop of
1/2" w.c. When gas piping is not included in the
layout drawing, contact the local gas supplier.
• An isolating valve and union connection should
be used and fitted into the supply adjacent to the
heater.
• A minimum 1/8" NPT plugged tapping
accessible for test connection must be installed
immediately upstream of the gas supply
connection to the heater.
• For suspended heaters, an approved metal
flexible connection between the isolating valve
and the heater may be used. To reduce
pressure loss, use one pipe size larger than
the heater gas connection.
IMPORTANT - The complete installation must be
purged and tested for gas soundness in accordance
with local and national codes.
• Do not high pressure (in excess of 1/2 psi
[14" w.c.]) test the gas piping with the burner
connected. Close manual shut-off valve
during any pressure testing equal to or less
than 1/2 psi (14" w.c.). Failure to follow these
instructions can result in property damage.
Check the pipe and tubing ends for leaks before
placing heating equipment into service. When
checking for gas leaks, use a soap and water
solution; never use an open flame.
Figure 9: Gas Connection
• Hold gas nipple
securely with pipe
wrench when
attaching the flex gas
connector.
Do not bend flexible
gas connector
sharply.
Option A:
Stainless Steel
Flex Gas
Connector
• Do not twist flexible
gas connector.
• Ensure all
joints are
gas tight.
Gas Shut-off Valve
Option B:
Medium or Heavy
Gauge Pipe
Gas Connector
Drip Leg
Union
Connection
14
Cap
SECTION 9: WIRING
SECTION 9: WIRING
WARNING
Electrical Shock Hazard
Disconnect electrical power and gas supply before
servicing.
This appliance must be connected to a properly
grounded electrical source.
Failure to follow these instructions can result in
death or electrical shock.
All heater models require constant 120 V 60 Hz 1Ø
power supply. Check heater(s) rating plate for
electrical rating for proper circuit sizing. For
servicing, a disconnect switch of proper electrical
rating should be installed in the vicinity of the heater.
All heaters are equipped with thermostat
connections suitable to power a 24 V thermostat.
Heater must be wired and electrically grounded in
accordance with local codes. In the absence of local
codes in accordance with: United States: refer to
National Electrical Code® NFPA 70 - latest revision
Canada: refer to Canadian Electrical Code CSA
C22.1 Part I - latest revision.
9.1 Positioning Thermostats
A room thermostat or ROBERTS GORDON®
control should be mounted on a vibration-free wall or
column at a height of approximately 5' (1.5 m) from
the floor to measure the ambient temperature. It
should be clear of both cold drafts and the direct
path of warm air from the heater.
Avoid mounting thermostat on outside walls or in
areas directly exposed to radiant heat or sunlight.
Install wall tag in a visible location near thermostat.
9.1.1 Fan Control
The heater’s axial fan can be used during the offseason for air circulation. A low voltage thermostat
with fan control must be used. See Page 15, Section
9.2 for thermostat connection details.
9.2 Low Voltage Thermostat with One Heater
15
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
9.3 UHA[S] Series Internal Wiring Diagram
AXIAL FAN
AXIAL FAN (UHA 300, 350, 400)
BLACK
L2
GREEN
WHITE
GREEN
BLACK
L1
WHITE
WHITE
Flue
Blower
BLACK
WHITE
GREEN
BLACK
GREEN
BLUE
1
4
5
YELLOW
BLUE
24 VAC
HOT
BLUE
3
2 1
6
5
YELLOW
4
ORANGE
R
ORANGE
ORANGE
ORANGE
LIMIT SWITCH
FLAME
MANUAL RESET LIMIT SWITCH
(UHA 30 - 125 ONLY)
GAS VALVE
BLACK
BROWN
GROUND
PRESSURE SWITCH
LIMIT SWITCH
(UHA 300,
350, 400
3
TRANSFORMER
WHITE
GREEN
R = 24 VAC TO THERMOSTAT (RED)
G
G = MANUAL FAN INPUT FROM THERMOSTAT (GREEN)
W
W= HEAT DEMAND INPUT FROM THERMOSTAT (WHITE)
C = COMMON SIDE OF TRANSFORMER
C
IGNITION MODULE
THERMOSTAT INPUT: FIELD SUPPLIED
SENSE
BLACK
ELECTRODE
BLACK
BLACK
BLACK
ACC
CMB BLOWER
BLACK
L1
BLACK
NOTE:
For field wiring into service junction box, or if any of the original wire supplied with the heater
must be replaced, it must be replaced with wiring material having a temperature rating of at least 105°C
and 600 volts. For supply connections use No. 14 AWG or larger wires.
16
SECTION 9: WIRING
9.4 UHA[S] Series Ladder Wiring Diagram
NOTE:
For field wiring into service junction box, or if any of the original wire supplied with the heater
must be replaced, it must be replaced with wiring material having a temperature rating of at least 105°C
and 600 volts. For supply connections use No. 14 AWG or larger wires.
17
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
9.5 Electrical Connection to the Heater
Flexible Conduit
BX Connector
Burner
Connect wires together
with suitable approved
wire connectors.
L1
L2
Ground
Green to Ground
White to L2
Black to L1
Black
White
Green
Junction Box
Note: Junction box is not provided with heater.
Conduit can also be attached directly to heater with wire junction made within the heater cabinet.
18
SECTION 10: OPERATION AND MAINTENANCE
SECTION 10: OPERATION AND MAINTENANCE
Installation, service, and annual inspection of the
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.
All components are accessed via the door secured
by 4 sheet metal screws. Opening the door exposes
live electrical connections and hot components.
WARNING
Electrical Shock Hazard
Use extreme caution during start-up.
Controls compartment contains live electrical
connections.
Failure to follow these instructions can result in
death or electrical shock.
10.1 Pre-Start-Up Checks
All pre-start-up checks must be carried out
before lighting the heater.
Ensure that the heater and all controls are suitable
for the gas, pressure and electrical supply to which
they are to be connected.
10.1.1 Louvers
Where fitted, the air delivery louvers need to be set
during start-up to give the required air distribution.
WARNING
10.1.2 Electrical Checks
All pre-start-up checks must be carried out before
start-up the heater.
1. Check that all site wiring is connected in
accordance with the appropriate wiring diagram
on Page 16, Section 9.3.
10.1.3 Gas Supply
All aspects of the gas installation including the gas
meter must be inspected, tested for gas tightness
and purged in accordance with local and national
codes.
Ensure that the air is fully purged from the heater
inlet pipe up to the main gas valve inlet test nipple.
10.1.4 Mechanical Checks
1. Check that the fan is free to run and
delivery louvers are turned to give required
air deflection.
2. Check that the flue (and air intake for separated
combustion units) is installed in accordance
with these instructions and local regulations.
10.2 Begin Start-Up
10.2.1 Before Operating the Heater
To ensure that all the controls are in safe working
order, operate the heater for the first time with the
isolating gas valve turned off and power supply
turned on.
1. Turn off the isolating gas valve.
2. Turn up the thermostat above room
temperature. The automatic ignition
sequence will now begin as described
on Page 20, Figure 10.
There will be no ignition of the burner and lockout
will occur, which proves the controls are operating
correctly.
Cut Hazard
Turn off gas and electrical supply before maintenance.
Fan can start automatically at any time.
Failure to follow these instructions can result in severe
injury or product damage.
19
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
Figure 10: Automatic Burner Control Sequence
If at any stage the flame fails, the control will retry
for ignition. The control has four trials for ignition
before a one hour lockout.
Figure 11: Gas Valve for Models UHA[S] 150 - 400
Top View
Regulator
½PSI
End View
C
IN
ON
OFF
Gas Inlet
Inlet Pressure
20
Description
Gas Valve 150 - 225 NG
Gas Valve 150 - 225 LP
Gas Valve 250 - 400 NG
Gas Valve 250 - 400 LP
Outlet
Pressure
Part Number
90032505
90032506
90032520
90032521
SECTION 10: OPERATION AND MAINTENANCE
10.2.2 Start-Up the Gas Valve (All Gases)
10.2.2.1 Check Burner Gas Pressure
1. Remove the plug in the outlet (burner) pressure
test point and connect a pressure tap and a
manometer.
2. With the burner firing, measure the pressure on
the manometer. To adjust the burner pressure,
remove the regulator cover from the valve and
turn the regulator adjustment screw to set the
required burner pressure as stated in the
Technical Data Tables for the correct gas and
model on Page 39, Section 15.3.
NOTE: If the correct burner pressure cannot be
reached, then check the inlet pressure to the valve
with the burner firing. See Technical Data Tables on
Page 39, Section 15.3 for inlet pressure
requirement.
Do not continue to adjust the regulator if the
pressure is not changing.
If the inlet pressure is too low to allow correct burner
pressure setting, then the gas inlet pressure must be
corrected before completing the commission.
10.2.5 External Controls
External controls may include time switch, interlock
switch, room thermostat and frost thermostat.
Operate each control to ensure that they function
correctly. Set the switches (if fitted) and
thermostat(s) to the users’ requirements.
10.3 Complete the Start-Up
Ensure that all covers are fitted correctly and all test
points are properly sealed.
10.3.1 Instruction to the User
Explain the controls of the heater to the user
including how to turn it on and off, using the controls
fitted on site.
Give this manual to the user.
Ensure that the user is shown and understands the
importance of maintaining clearances to
combustibles on Page 4, Figure 1 and the user
instructions on Page 22, Section 11 through Page
22, Section 11.4 and all warnings defined in this
manual.
Check Gas Rate
1. After burner pressure adjustment, allow the
heater to operate for at least 15 minutes and
then re-check settings. Adjust pressure setting
if necessary.
2. Check gas flow rate at gas meter.
3. Turn off heater and electrical supply.
4. Remove the manometer and refit all covers to
the valve and tighten the screw of the outlet
pressure tap.
10.2.3 Pressure Switch
The pressure switch is factory pre-set for each
model and is not adjustable.
10.2.4 Turning Off the Heater
Set the thermostat to the "OFF" position or lowest
setting and the main burner will stop.
The fan will run until it is stopped automatically by
the fan thermostat.
Do not use a disconnect switch for control of
heater. Disconnect switch will turn off the fan.
Heat exchanger could be damaged. Warranty will
not cover damage to the heat exchanger if
operated improperly. Only use the disconnect
switch for turning off heater for service or during
off-season.
21
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 11: USER INSTRUCTIONS
11.1 User Instructions
The UHA[S] Series heaters are fully automatic and
operate from the external controls fitted on site.
WARNING
11.4 Simple Troubleshooting
Some possible reasons for the heater not operating
are:
1. Gas supply not "ON".
2. Electricity supply not "ON".
3. The time and/or temperature controls are not
"ON".
4. A limit switch may have operated. This may be
caused by an interruption of the electrical
supply, failure of the distribution fan or vent or
heat exchanger blockage.
Electrical Shock Hazard
Disconnect electrical power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
11.2 Heater Operation
When the heater has been switched on by the
thermostat installed on site, the main burner will
automatically turn on.
The burner control box will control the safe ignition
of the flame.
All heaters require a constant gas and electricity
supply which must not be interrupted during the
normal operation of this heater.
11.3 Lighting Instructions
11.3.1 To Turn On Heater
1. Ensure that the electrical and gas supplies to
the heater are on. Check that the on site
controls are "ON".
NOTE: The thermostat setting must be above the
ambient temperature for the heater to operate.
2. The automatic firing sequence will begin as
described on Page 20, Figure 10. The heater
will now operate automatically under the control
of the on site controls.
11.3.2 To Turn the Heater Off
Set the thermostat to the "OFF" position.
The burner will turn off immediately.
The fan will continue to run for 90 seconds.
To restart, turn the thermostat above room
temperature.
22
If a temperature limit switch persistently trips, there
is a fault which must be investigated by a contractor
qualified in the installation and service of gas-fired
heating equipment.
11.4.1 Simple Troubleshooting (Burner Fault)
If the burner fails to ignite for any reason, it will retry
for ignition (4 trials total). After 4 unsuccessful
ignition trials, the control will put the heater into
lockout for 1 hour.
Lockout should not occur during normal operation of
the heater and indicates there is a fault condition
which must be corrected. There is an LED light on
the ignition control that flashes codes to assist in
fault correction. See Figure 12 for LED indication
codes.
Figure 12: LED Diagnostic Codes
LED INDICATION FAULT MODE
Slow Flash
Normal Operation - No call for heat.
Fast Flash
Normal Operation - Call for heat.
2 Flashes
Ignition Lockout - No flame detected.
3 Flashes
Airflow Fault - Pressure switch open or closed.
4 Flashes
Temperature Limit or
Manual Reset Limit Switch Open
5 Flashes
Flame Sense Error - Gas valve not energized.
Steady On
Internal Control Failure
SECTION 11: USER INSTRUCTIONS
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. Leave the building.
6. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
7. If you cannot reach your gas
supplier, call the Fire Department.
WARNING
Fire Hazard
Do not store or use petrol or other
flammable vapours and liquids in the
vicinity of this or any other appliance.
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.
23
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 12: SERVICING
12.1 Servicing Instructions
After start-up, the heater will require maintenance to
be carried out annually. If the heater is used in a
dirty or dusty area, more frequent maintenance may
be necessary.
WARNING
Cut Hazard
Turn off gas and electrical supply before maintenance.
Fan can start automatically at any time.
Failure to follow these instructions can result in severe
injury or product damage.
NOTE 1: After any maintenance or repair work,
always test fire the heater in accordance with the
start-up instructions on Page 19, Section 10 through
Page 21, Section 10.3.1 to ensure all safety systems
are in working order before leaving the heater to
operate. Minor faults may be traced by using the
troubleshooting charts on Page 27, Section 13
through Page 30, Section 13.5.
NOTE 2: Check all gas pipes and pipe joints to
ensure there are no cracks or gas leaks. Any cracks
in the pipes or pipe joints must be repaired.
12.3 Fan/Motor Assembly Maintenance
The main fan bearings are permanently sealed and
do not need lubrication. Before cleaning, turn off gas
and electrical supply. Remove the fan and use a
small brush or duster to clean the fan blades from
each side. Replace fan when done.
12.4 Heat Exchanger Maintenance
The heat exchanger will remain clean unless a
problem has developed with combustion. Inspect the
heat exchanger. Look for signs of overheating at the
front tubes which may indicate burner over firing or
persistently low air flows.
12.5 Gas Valve Maintenance
No regular maintenance is required on this device.
To change gas control valves, See Page 31, Section
14.1.
Do not repair or disassemble gas valve.
Replace faulty gas valves with genuine
replacement parts sold and supplied by
Roberts-Gordon.
12.6 Flue Blower
The flue blower should not require maintenance.
However, if the air pressure switch is causing burner
lockout, then remove the flue blower from the vent
box by unscrewing the three screws at the mounting
plate. Remove the four screws attaching the
mounting plate to the fan inlet (See Page 35,
Section 14.6). Ensure that the fan is free to run and
that the fan wheel is clean.
12.7 Venting and Air Intake Pipe
Inspect all venting and air intake pipe. Ensure that
all seams are sealed and suspension points secure.
Repair suspension points if any part of the venting
or combustion air pipe is sagging. Check to make
12.2 Burner Maintenance
sure any insulation is not missing or in poor
1. Open the door and remove the burner compart- condition. Replace as necessary. Check all venting
ment cover. See Page 32, Section 14.2.
and air intake components to ensure they are in
2. Clean any deposits from the main burner which good condition, gas tight and corrosion-free.
may have formed in the injectors or venturi of
the burner. See Page 32, Section 14.2.
3. Remove the ignition electrode and flame probe.
Check condition of ignition electrode and flame
probe. Clean off any deposits which may have
been formed, check condition of ceramic
insulators. Replace as necessary.
NOTE 3: Inspect all suspended components and
hardware. Ensure that they are in good condition,
properly tightened, and corrosion free.
24
SECTION 12: SERVICING
12.8 Maintenance Checklist
Installation Code and Annual Inspections: All
installations and service of ROBERTS GORDON®
equipment must be performed by a contractor
qualified in the installation and service equipment
sold and supplied by Roberts-Gordon and conform
to all requirements set forth in the ROBERTS
GORDON® manuals and all applicable
governmental authorities pertaining to the
Explosion Hazard
installation, service and operation of the equipment.
Service and annual inspection must be done by a
To help facilitate optimum performance and safety,
contractor qualified in the installation and service of
Roberts-Gordon recommends that a qualified
gas-fired heating equipment or your gas supplier.
contractor annually inspect your ROBERTS
Turn off gas and electrical supplies before performing GORDON® equipment and perform service where
service or maintenance.
necessary, using only replacement parts sold and
Failure to follow these instructions can result in death, supplied by Roberts-Gordon.
WARNING
injury or property damage.
The Vicinity of the Heater
Do not store or use flammable objects, liquids or vapors near the heater.
Immediately remove these items if they are present.
See Page 3, Section 3.
Vehicles and Other
Objects
Maintain the clearances to combustibles.
Do not hang anything from, or place anything on, the heater.
Make sure nothing is lodged in between the heat exchanger or in the louvers.
Immediately remove objects in violation of the clearances to combustibles.
See Page 3, Section 3.
Vent Pipe/Terminals
Venting must be intact. Using a flashlight, look for obstructions, cracks on the
pipe, gaps in the sealed areas or corrosion.
The area must be free of dirt and dust.
Remove any carbon deposits or scale using a wire brush.
If the vent terminal has a screen built in, remove any dirt, dust or deposits
from the screen.
See Page 13, Section 7.
Combustion Air Intake
Pipe
Intake pipe and inlet must be intact. Look for obstructions, cracks on the pipe,
gaps in the sealed areas or corrosion.
The area must be free of dirt and dust. Clean and reinstall as required.
Heat Exchanger
Make sure there are no cracks.
See Page 14, Section 8.
Make sure there is no sagging, bending or distortion.
Clean or replace as required.
Gas Line and Shut-off
Valves
Check for gas leaks. See Page 14, Section 8.
25
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
Burner Observation
Window
Make sure it is clean and free of cracks or holes.
Clean and replace as required.
Flue Blower Scroll, Wheel Compressed air or a vacuum cleaner may be used to clean dust and dirt.
and Motor
Inshot Burners and
Clear of obstructions (even spider webs will cause problems).
Orifices
Carefully remove any dust and debris from the burner.
Direct-Spark Igniter
Replace if there are cracked ceramics, excessive carbon residue, or erosion
of the electrode.
The electrode gap should be 1/8" (3.2 mm).
Thermostat
There should be no exposed wire or damage to the device or wiring.
See Page 19, Section 10.
Suspension Points
Make sure the heater is hanging securely.
Look for signs of wear on the suspension materials or ceiling.
See Page 6, Figure 2.
Silicone Tubing
Ensure tight, secure fit on all pressure fittings at pressure switch,
burner partition, and blower outlet.
Gas Valve
Verify that cap covering pressure regulator adjustment screw is secure and
has not been tampered with.
Verify all wiring connections.
Condensate Drain
(when installed)
26
Flush drain and clear any obstructions.
SECTION 13: TROUBLESHOOTING
SECTION 13: TROUBLESHOOTING
13.1 General
WARNING
Explosion Hazard
Installation must be done by a registered installer/
contractor qualified in the installation and service of
gas-fired heating equipment or your gas supplier.
Failure to follow these instructions can result in death,
injury or property damage.
START
Are gas & electrical
supplies on?
No
Turn on supplies.
Yes
Does axial fan run
immediately upon supplying Yes
power to heater?
Wait 10-15 minutes for
limit switch to cool. Does
fan stop running?
Yes
Fan and limit switch are
operating normally.
No
Replace temperature
limit switch.
No
Is ignition control showing a
Yes
"2 flashes" led code?
Burner has locked out due
to ignition failure. Use
Troubleshooting for
Automatic Ignition Burner
Systems section to test
burner.
No
Does the flue
blower run?
No
Use Troubleshooting for
Flue Blower section to test
fan.
Yes
Yes
With external controls (i.e.
No
thermostat) on, does the
burner continue through the
heating cycle?
Has burner “Locked Out”?
No
The limit switch has
tripped. See Manual Reset No
Limit Switch Figure.
Yes
Yes
Use Troubleshooting for
Automatic Ignition Burner
Systems section to test burner.
Ensure proper air flow
clearance for axial fan.
Open louvers slightly.
Replace axial fan if it does
not operate.
Yes
Heater Operating
TROUBLESHOOT ENDS.
No
Replace limit switch.
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
27
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
13.2 Troubleshooting For Automatic Ignition Burner Systems
WARNING
START
Are gas & electrical
supplies on?
No
Turn on supplies.
No
Turn on controls.
Yes
Are external controls
(i.e. Thermostat) on?
Electrical Shock Hazard
Do not touch ignition components.
Voltage from ignition components is high.
Yes
Is ignition control showing
a "4 flashes" led code?
Yes
Press in reset button on
manual reset limit switch
No
Is 120 V supply at fan
connections?
Failure to follow these instructions can
result in death or electrical shock.
No
Does flue blower run?
Yes
Flue blower faulty;
replace
No
Burner control faulty or wiring
connections faulty. Repair
or replace as necessary
Yes
Does air pressure switch
change over?
No
Check for too much vent/air inlet duct. Check for blockage in
vent and combustion air circuit. Check for faulty air pressure
switch. Check pressure switch hoses for leaks or cracks.
Do not attempt to circumvent pressure switch circuit to
place unit in operation.See Pressure Switch section for details.
Yes
Wait 30 - 40 seconds.
Does ignition spark
No
Is ignition lead okay and
connected?
Yes
Is spark electrode okay?
Ignition control faulty;
replace.
See Ignition Control section.
No
Is the gas valve operating?
To test valve, See
No
Troubleshooting for Gas
Valves section.
Replace valve.
Yes
Does the flame light?
Yes
Is ignition control showing
a "2 flashes" led code?
Yes
Is the flame current at
least 1 μAmp DC when
the flame ignites?
Yes
Trace fault in supervision
system. See
Troubleshooting
for Flame Supervision
System section.
No
Heater Operating
TROUBLESHOOT ENDS.
28
No
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
For your safety and optimum heater performance,
use only replacement parts sold and supplied by
Roberts-Gordon.
Conduct start-up procedure as shown on Page
19, Section 10.
SECTION 13: TROUBLESHOOTING
13.3 Troubleshooting for Flame Supervision System
To measure flame current, connect a 0 - 50 μA DC meter in
series with the flame probe. If the meter reads negative
values, then reverse the test leads.
START
Connect a DC ammeter in
series with the flame probe.
Is the flame present and
at least 1 μA DC flame
current?
No
Use General
Troubleshooting section to
trace the fault.
Yes
Is there a current flowing in
the flame probe circuit with
no flame present?
Yes
Is the connecting lead
damaged? Is the flame probe
damaged or touching earthed
components?
Yes
Yes
Is inlet burner gas pressure
correct? Is live and neutral
polarity correct? Is
flame probe circuit correct?
Yes
Repair or replace as
necessary.
No
Does “lockout” occur when
there is a flame present?
Replace ignition control.
No
Repair or replace as
necessary.
No
Heater Operating
TROUBLESHOOT ENDS.
No
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.
29
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
13.4 Troubleshooting for Gas Valves
START
Is gas pressure at inlet of the
valve correct for gas type?
Note pressure found.
No
Fault elsewhere.
Correct pressure problem.
No
Valve or ignition control
faulty. Replace with
one of correct type.
No
Valve faulty.
Replace with one of
correct type.
No
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
Yes
Does gas pressure at outlet
of the valve rise when
valve turns on?
Yes
Yes
Does gas pressure at
outlet of valve return to zero or
lower when valve turns off?
Yes
Valve Operating
TROUBLESHOOT ENDS.
13.5 Troubleshooting for Flue Blower
START
Does flue blower run
automatically when there
is a call for heat?
No
Correct power
supply problem.
Yes
Blower motor faulty.
Replace with correct type.
Yes
Does blower turn on and
off while burner is firing
continously?
Yes
Check blower motor leads
for loose connections.
No
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
No
Blower Operating
TROUBLESHOOT ENDS.
For your safety and optimum heater performance,
use only genuine replacement parts sold and supplied by Roberts-Gordon.
Conduct start-up procedure as shown on Page 19, Section 10.
30
SECTION 14: REPLACEMENT PARTS
SECTION 14: REPLACEMENT PARTS
See warnings and notes on Page 24, Section 12
before removing or replacing parts.
Burner Components
All serviceable burner parts are accessed by the
door on the side of the heater. Remove the
sheetmetal screws.
14.1 Gas Valve
Remove the gas supply pipe at the heater inlet.
NOTE: Flexible duct only applies
for models UHAS.
½PSI
C
IN
ON
OFF
Description
Gas Valve, NG (Models UHA[S] 150 - 225)
Gas Valve, LP (Models UHA[S] 150 - 225)
Gas Valve, NG (Models UHA[S] 250 - 400)
Gas Valve, LP (Models UHA[S] 250 - 400)
Part Number
90032505
90032506
90032520
90032521
Follow steps in Section 14.2 and See Page 32,
Section 14.2.1 to remove gas valve/manifold.
Replace in reverse order. Verify that the gas flow
direction of the valve is correct. Use a minimum
amount of gas seal on the thread joint. Check that
all the joints are leak free. Reset gas valve. See
Page 21, Section 10.2.2.
IT IS IMPORTANT THAT ONLY THE CORRECT
GAS VALVE IS USED WHEN REPLACING THESE
CONTROLS.
31
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
14.2 Burner Compartment
The burner compartment is
a sealed compartment.
Following any work,
re-seal the compartment
with the gas pipe rubber
seal fully in place and all
screws fitted and tight.
Burner
compartment
cover
Flame probe
Viewing port
for flame probe
Remove flexible
air duct from spigot
Ignition electrode
NOTE: Flexible duct only applies
for models UHAS.
Viewing port
for ignition electrode
Remove
access plate
Rubber Seal
Remove screws and
pull off burner cover
14.2.1 Burner Injectors
Ensure gas tight fitting of injectors.
Ensure correct alignment with burners.
Ensure all pipe joints are gas tight.
MODEL
Orifice Quantity
UHA[S]
150
UHA[S]
175
UHA[S]
200
UHA[S]
225
UHA[S]
250
UHA[S]
300
UHA[S]
350
UHA[S]
400
7
8
9
10
11
12
14
14
Natural Gas (G20)
Orifice Marking
P/N
43
43
2.25 mm
2.25 mm
2.25 mm
40
40
40
91930043
91930043
91930225
91930225
91930225
91930040
91930040
91930040
Propane (G31)
Orifice Marking
1.35 mm
1.35 mm
54
54
54
1.45 mm
53
53
P/N
91930135
91930135
91930054
91930054
91930054
91930145
91930053
91930053
32
SECTION 14: REPLACEMENT PARTS
14.3 Ignition Electrode and Flame Probe
To replace the electrode or flame probe, remove the electrical lead and screw.
Pull out from mounting. Refit in reverse ensuring that the gap to burner is as shown in the
front view of the burner compartment.
Description
Spark Electrode
Automatic Ignition Flame Probe
Transformer
Ignition Module
Inshot Burners UHA[S] 150
Inshot Burners UHA[S] 175
Inshot Burners UHA[S] 200
Inshot Burners UHA[S] 225
Inshot Burners UHA[S] 250
Inshot Burners UHA[S] 300
Inshot Burners UHA[S] 350
Inshot Burners UHA[S] 400
Limit Switch (150 - 400)
Limit Switch (300 - 400)
Part Number
90427411
90439300
90436900K
90434008
92000001
92000001
92000000
92000000
92000000
92000000
92000000
92000002
90412103
90412105
Qty.
1
1
1
1
7
8
9
10
11
12
14
14
1
2
33
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
14.4 Heat Exchanger
The standard heat exchanger assembly is compossed of multiple tubular heat exchangers in models
UHA[S]150 - UHA[S]400, there is a four pass exchange.
MODEL
Aluminized Heat
Exchanger Assembly P/N
UHA[S]
150
UHA[S]
175
UHA[S]
200
UHA[S]
225
UHA[S]
250
UHA[S]
300
UHA[S]
350
UHA[S]
400
12117100
12116100
12115100
12114100
12113100
12112100
12111100
12111100
Stainless Heat
Exchanger Assembly P/N 12117100SS 12116100SS 12115100SS 12114100SS 12113100SS 12112100SS 12111100SS 12111100SS
Tube Heat Exchanger
7
8
9
10
11
12
14
14
Tube Plate
1
1
1
1
1
1
1
1
Tube Support
2
2
2
2
2
2
2
2
N/A
N/A
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Top Panel Insulated
1
1
1
1
1
1
1
1
Rear Panel
1
1
1
1
1
1
1
1
Front Panel
1
1
1
1
1
1
1
1
Rear Fan Panel
1
1
1
1
1
1
1
1
Screws Type A/B
42
45
45
50
50
50
50
50
Tube Support Strap
Base Panel
End Panel Insulated
Qty
14.5 Louvers and Louver Spring
HorizontalHorizontal
Louvers Louvers
Description
UHA[S]
150 - 175
UHA[S]
200 - 250
UHA[S]
300 - 400
Horizontal Louvers P/N
Spring P/N
Quantity
11011847
91901200
7
11011847
91901200
9
11011846
91901200
11
Push and
in Louver and
Push in Louver
compress compress
spring to spring to
remove
and replace
remove and
replace
(opposite
(opposite end
first) end first)
The louvers for standard range models UHA[S]150 - UHA[S]400 are only available in horizontal
configurations.
34
SECTION 14: REPLACEMENT PARTS
14.6 Flue Blower
Remove screws securing outlet
flange to the flue adapter.
Rear Panel
Hole
Flue Adapter
to Flue Blower
screws
Refit in reverse order.
Vent Box
Vent Box
screws
Outlet
Gasket
Flue
Adapter
Flue Blower
Disconnect
electrical connections
at plug in tabs.
Mounting
Plate
Remove screws securing flue
blower mounting plate to vent
box.
Vent Box
Gasket
Mounting Plate
to Flue Blower
screws
Mounting Plate
to Vent Box
screws
Gasket
Remove screws securing
mounting plate to blower.
Air Plate
Use new gaskets.
Refit in reverse.
Ensure sealed joints.
Ensure mounting plate orifice is
clear and not obstructed.
MODEL
UHA[S]
150 - 175
UHA[S]
200 - 300
UHA[S]
350 - 400
Flue Blower P/N
90710405
90710403
90710402
IT IS IMPORTANT THAT ONLY THE CORRECT FLUE BLOWER SPECIFIED FOR EACH MODEL TYPE
IS USED WHEN REPLACING THESE ITEMS.
Carry out a start-up after working on or changing an flue blower. See Page 22, Section 11.
35
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
14.7 Pressure Switch
Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of
pressure switch for model. The pressure switches are color coded for each pressure setting.
WARNING
Carbon Monoxide Hazard
Use correct pressure switch specified for each model.
Use of incorrect pressure switch or disabling
pressure switch circuit could cause unsafe condition.
Failure to follow these instructions can result in
death or serious injury.
Carry out a commission after working on or changing a pressure switch. See Page 19, Section 10.
MODEL
UHA[S]
150 - 175
UHA[S]
200 - 225
UHA[S]
250
UHA[S]
300 - 350
UHA[S]
400
Pressure Switch
Kit P/N
90439802
90439808
90439803
90439807
90439808
yellow
orange
gray
brown
orange
.32
.79
.41
.68
.79
90439850
90439850
90439850
90439850
90439850
Color Code
Set Point in. w.c.
Pressure Switch Snap
Ring P/N
14.8 Ignition Control
The control mounts to the electrical plate. Pull out ignition cable and wiring from board, noting their
positions.
Release the four mounting standoffs.
Refit in reverse. Ensure correct location of ignition cable and all other wiring.
14.9 Axial Fan/Guard/Motor Assembly
The axial fan unit for the heater is supplied completely assembled and balanced
MODEL
UHA[S] 150 - 175
UHA[S] 200- 250
UHA[S] 300 - 400
Axial Fan Guard
91901105
91901104
91901105
Axial Fan Motor
90600106
90600107
90600106
Axial Fan Blade
90709005
90709006
90709005
36
SECTION 14: REPLACEMENT PARTS
14.9.1 Fan Removal and Replacement
Remove
the mounting
hardware.
Remove
the screws
and washers.
Description
Axial Fan UHA[S] 150 - 175
Axial Fan UHA[S] 200 - 250
Axial Fan UHA[S] 300 - 400
Part Number
90710416
90710417
90710416
Qty.
1
1
2
14.9.2 To Replace the Fan Assembly
• To replace the fan assembly, reverse the
procedure shown above.
• Check that the fan blades are free to rotate
before turning on the power to the fan.
• Strictly comply with the color code of the fan
wires to ensure correct operation.
• See Page 16, Section 9.3 wiring diagram.
• Use only genuine replacement parts sold and
supplied by Roberts-Gordon
14.10 Limit Switches
14.10.1 Removal and Replacement
1. Remove the electrical connections to the
switch.
2. Unscrew the two screws securing the switch.
3. Fit a new switch with two screws.See Page 39,
Section 15.3.
4. Reconnect the electrical connections and test
operation.
37
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 15: SPECIFICATIONS
15.1 Standard (Models 150 - 400) UHA[S] Series Dimension Data
A
Width
B
Height
C
Support Spacing
D
Support Spacing
E
Support Spacing
F
Centre of Flue
G
Centre of
Flue/Air Intake
H
Position of Flue
J
Gas Inlet Position
Z
Length
38
Model
UHA[S]
150
UHA[S]
175
UHA[S]
200
UHA[S]
225
UHA[S]
250
UHA[S]
300
UHA[S]
350
UHA[S]
400
in
(cm)
in
(cm)
in
(cm)
in
(cm)
in
(cm)
in
(cm)
in
(cm)
in
(cm)
in
(cm)
in
(cm)
42.4
(108)
26.9
(68)
17.7
(45)
12.3
(31)
12.4
(32)
15.5
(39)
5.5
(14)
8.2
(21)
5.8
(15)
34
(86)
42.4
(108)
26.9
(68)
17.7
(45)
12.3
(31)
12.4
(32)
15.5
(39)
5.5
(14)
8.2
(21)
5.8
(15)
34
(86)
42.4
(108)
35.2
(89)
17.7
(45)
12.3
(31)
12.4
(32)
17.5
(44)
6.4
(16)
8.8
(22)
5.8
(15)
34
(86)
42.4
(108)
35.2
(89)
17.7
(45)
12.3
(31)
12.4
(32)
17.5
(44)
6.4
(16)
8.8
(22)
5.8
(15)
34
(86)
42.4
(108)
35.2
(89)
17.7
(45)
12.3
(31)
12.4
(32)
17.5
(44)
6.4
(16)
8.8
(22)
5.8
(15)
34
(86)
52.3
(133)
43.5
(110)
24.7
(63)
12.3
(31)
15.3
(39)
13.8
(35)
7
(18)
11
(28)
5.8
(15)
34
(86)
52.3
(133)
43.5
(110)
24.7
(63)
12.3
(31)
15.3
(39)
13.8
(35)
7
(18)
11
(28)
5.8
(15)
34
(86)
52.3
(133)
43.5
(110)
24.7
(63)
12.3
(31)
15.3
(39)
13.8
(35)
7
(18)
11
(28)
5.8
(15)
34
(86)
SECTION 15: SPECIFICATIONS
15.2 General Technical Data Table (All Models)
Model UHA[S]
150
Full Load Amps @ 115 V
UHA[S] UHA[S]
175
200
UHA[S]
225
UHA[S]
250
UHA[S]
300
UHA[S] UHA[S]
350
400
A
5.8
5.8
10.6
10.6
10.6
11.6
11.6
11.6
CFM
2245
2245
3716
3716
3716
4663
4663
4663
Flue Intake Size
in (cm)
4 (10)
4 (10)
4 (10)
4 (10)
4 (10)
4 (10)
4 (10)
4 (10)
Air Intake Size
in (cm)
4 (10)
4 (10)
4 (10)
4 (10)
4 (10)
5 (13)
5 (13)
5 (13)
ft (m)
40 (1)
40 (1)
40 (1)
40 (1)
40 (1)
40 (1)
40 (1)
40 (1)
Air Volume
Flue and Air Intake
*Maximum Straight Flue/Air Intake
*Do not exceed the maximum length of flue stated or heater may not operate properly.
15.3 Technical Data Table (All Models)
Model
UHA[S] UHA[S] UHA[S] UHA[S] UHA[S]
150
175
200
225
250
UHA[S]
300
UHA[S]
350
UHA[S]
400
Total Input
(Btu/h) x (1000)
150
175
200
225
250
300
350
385
Total Output
(Btu/h) x (1000)
123
143.5
164
184.5
205
246
287
315.7
%
82
82
82
82
82
82
82
82
3.7
4.0
2.7
2.7
3.3
10.5
9.4
9.3
11.1
Efficiency
Natural Gas (G20) Data - Inlet Pressure 5.0 in w.c. Min., 14 in w.c. Max.
Burner Pressure
in. w.c.
3.2
3.4
3.7
LPG / Propane (G31) Data - Inlet Pressure 12.0 in w.c. Min., 14 in w.c. Max.
Burner Pressure
in. w.c.
9.9
10.4
10.5
10.7
39
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
40
SECTION 16: THE ROBERTS GORDON® COMBAT® UHA-SERIES WARRANTY
SECTION 16: THE ROBERTS GORDON®
COMBAT® UHA-SERIES WARRANTY
ROBERTS-GORDON WILL PAY FOR:
Within 24 months from date of purchase by buyer or 27
months from date of shipment by Roberts-Gordon
(whichever comes first), replacement parts will be
provided free of charge for any part of the product which
fails due to a manufacturing or material defect.
Roberts-Gordon will require the part in question to be
returned to the factory. Roberts-Gordon will, at its sole
discretion, repair or replace after determining the nature
of the defect and disposition of part in question.
ROBERTS GORDON® Replacement Parts are warranted
for a period of 18 months from date of shipment from
Roberts-Gordon or the remaining ROBERTS GORDON®
COMBAT® UHA-Series warranty.
ROBERTS-GORDON WILL NOT PAY FOR:
Service trips, service calls and labor charges.
Shipment of replacement parts.
Claims where the total price of the goods have not
been paid.
Damage due to:
• Improper installation, operation or maintenance.
• Misuse, abuse, neglect, or modification of the
ROBERTS GORDON® COMBAT® UHA-Series in any
way.
• Use of the ROBERTS GORDON® COMBAT® UHASeries for other than its intended purpose.
• Incorrect gas or electrical supply, accident, fire, floods,
acts of God, war, terrorism, or other casualty.
• Improper service, use of replacement parts or
accessories not specified by Roberts-Gordon.
• Failure to install or maintain the ROBERTS
GORDON® COMBAT® UHA-Series as directed in the
Installation, Operation and Service manual.
• Relocation of the ROBERTS GORDON® COMBAT®
UHA-Series after initial installation
®
®
• The use of the ROBERTS GORDON COMBAT
UHA-Series in a corrosive atmosphere containing
contaminants.
• The use of the ROBERTS GORDON® COMBAT®
UHA-Series in the vicinity of a combustible or
explosive material.
• Any defect in the ROBERTS GORDON® COMBAT®
UHA-Series arising from a drawing, design, or
specification supplied by or on behalf of the
consumer.
• Damage incurred during shipment. Claim must be
filed with carrier.
The data plate and/or serial number are removed,
defaced, modified or altered in any way.
The ownership of the ROBERTS GORDON® COMBAT®
UHA-Series is moved or transferred. This warranty is
nontransferable.
Roberts-Gordon is not permitted to inspect the damaged
controller and/or component parts.
READ YOUR INSTALLATION, OPERATION AND
SERVICE MANUAL
If you have questions about your controller, contact your
installing professional. Should you need Replacement
Parts or have additional questions, call or write RobertsGordon:
U.S.A.
1250 William Street
P.O. Box 44
Buffalo, New York 14240-0044
716.852.4400
On the web at: www.rg-inc.com
Roberts-Gordon's liability, and your exclusive
remedy, under this warranty or any implied warranty
(including the implied warranties of merchantability
and fitness for a particular purpose) is limited to
providing replacement parts during the term of this
warranty. Some jurisdictions do not allow limitations on
how long an implied warranty lasts, so this limitation may
not apply to you. There are no rights, warranties or
conditions, expressed or implied, statutory or otherwise,
other than those contained in this warranty.
Roberts-Gordon shall in no event be responsible for
incidental or consequential damages or incur liability
for damages in excess of the amount paid by you for
the ROBERTS GORDON® COMBAT® UHA-Series.
Some jurisdictions do not allow the exclusion or limitation
of incidental or consequential damages, so this limitation
or exclusion may not apply to you. This warranty gives
you specific legal rights, and you may also have other
rights which vary from jurisdiction to jurisdiction.
Roberts-Gordon shall not be responsible for failure to
perform under the terms of this warranty if caused by
circumstances out of its control, including but not limited
to war, fire, flood, strike, government or court orders, acts
of God, terrorism, unavailability of supplies, parts or
power. No person is authorized to assume for RobertsGordon any other warranty, obligation or liability.
LIMITATIONS ON AUTHORITY OF
REPRESENTATIVES:
No representative of Roberts-Gordon, other than an
Executive Officer, has authority to change or extend these
provisions. Changes or extensions shall be binding only if
confirmed in writing by Roberts-Gordon's duly authorized
Executive Officer.
WARRANTY IS VOID IF:
The ROBERTS GORDON® COMBAT® UHA-Series is not
installed by an electrician qualified in the installation and
service of control systems for heating equipment.
You cannot prove original purchase date and required
annual maintenance history.
41
Attach this information to the wall near the ROBERTS GORDON® heater
®
Read the Installation, Operation and Service Manual thoroughly before installation, operation or service.
WARNING
OPERATING INSTRUCTIONS
1. STOP! Read all safety instructions on this information sheet.
2. Open the manual gas valve in the heater supply line.
3. Turn on electric power to the heater.
4. Set the thermostat to desired setting (above ambient temperature).
The automatic starting sequence begins.
TO TURN OFF THE HEATER
1. Turn the thermostat/time switch to 'OFF' or lowest setting. The burner
will turn 'OFF' immediately, but fans will continue to cool heat exchanger
until the fan thermostat switches off.
IF THE HEATER WILL NOT OPERATE, TO ENSURE YOUR SAFETY,
FOLLOW THESE INSTRUCTIONS TO SHUT DOWN YOUR HEATER
Fire Hazard
Some objects can catch fire or explode when placed
close to heater.
Keep all flammable objects, liquids and vapors the
required clearances to combustibles away from heater.
1. Set the thermostat to off or the lowest setting.
2. Turn off electric power to the heater.
3. Turn off the manual gas valve in the heater supply line.
4. Call your installer/contractor qualified in the installation and service
Failure to follow these instructions can result in death,
injury or property damage.
of gas-fired heating equipment.
Installation Clearances
Clearances to Combustibles
Roof Terminal
Top
Top
(Optional separated
combustion concentric
venting shown.)
Left
Top*
Wall
Terminal
10'
(3 m)
Rear*
Max. Mounting Height*
*Models
Top
Rear
Max Mounting Height 1
30 - 125
1" (2.5 cm)
18" (46 cm)
12' (3.7 m) - 20' (6 m)
150 - 400
6" (15 cm)
24" (61 cm)
20' (6 m) - 30' (9 m)
1
Heaters can be mounted higher if destratification fans are installed. See Installation, Operation
and Service Manual for specific mounting height recommendations.
NOTE: Venting directly from top of heater not applicable on Models 150-400.
Roberts-Gordon, LLC
1250 William Street
P.O. Box 44
Buffalo, NY 14240-0044 USA
Right
Left
Right
Bottom
Bottom
Models 30 - 125
Models 150 - 400
30 - 125
1" (2.5 cm)
0" (0 cm)
1" (2.5 cm)
18" (46 cm)*
2" (5 cm)
Models
Top
Bottom
Right
Left
Vent
150 - 400
6" (15 cm)
3" (8 cm)
31" (79 cm)*
6" (15 cm)
2" (5 cm)
* Clearance needed for servicing.
Telephone: 716.852.4400
Fax: 716.852.0854
Toll Free: 800.828.7450
Installation Code and Annual Inspections:
®
All installations and service of ROBERTS GORDON equipment must be performed by a contractor qualified in the installation and service of equipment sold and supplied by Roberts-Gordon and
®
conform to all requirements set forth in the ROBERTS GORDON manuals and all applicable governmental authorities pertaining to the installation, service and operation of the equipment. To help
®
facilitate optimum performance and safety, Roberts-Gordon recommends that a qualified contractor annually inspect your ROBERTS GORDON equipment and perform service where necessary,
using only replacement parts sold and supplied by Roberts-Gordon.
For installations at elevations above 2000' (610 m), the appliance shall be derated 4% for each 1000' (305 m) of elevation above sea level.
®
Further Information:Applications, engineering and detailed guidance on systems design, installation and equipment performance is available through ROBERTS GORDON representatives. Please
contact us for any further information you may require, including the Installation, Operation and Service Manual.
Models 100-400 are not for residential use.
© 2007 Roberts-Gordon, LLC
www.rg-inc.com
Printed in U.S.A.
P/N 91040031 Rev B