Page 1
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 serviceman with necessary information.
®
Combat
UHD-Series
Tubular Duct Furnace
(Standard Range)
Installation, Operation
& Service Manual
Models UHD[X][S][R]
150, 175, 200, 225
250, 300, 350, 400
Quality in Any Language™
© 2008 Roberts-Gordon LLC
Roberts-Gordon LLC
1250 William Street
P. O . B o x 4 4
Buffalo, New York 14240-0044
Telephone: 716.852.4400
Fax: 716.852.0854
Toll Free: 800.828.7450
www.rg-inc.com
P/N 113001NA 11/08 Orig.
Page 2
Page 3
© 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.
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 Manufactured Units...................................................... 3
3.3 Location and Suspension ............................................3
3.4 Minimum Required Installation Clearances .................3
3.5 Clearances to Combustibles ........................................3
3.6 Ventilation ....................................................................4
3.7 Gas Supply..................................................................4
3.8 Electrical Supply..........................................................4
3.9 Vent..............................................................................4
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 ................................................................6
SECTION 5: Duct Heater Installation.....................................7
5.1 General........................................................................ 7
5.2 Suspension.................................................................. 8
SECTION 6: Venting................................................................ 9
6.1 Changing Vent and Air Intake Orientation.................... 9
6.2 Venting......................................................................... 9
6.3 Vent Installation ........................................................... 9
6.4 Unvented Operation................................................... 10
6.5 Horizontal Venting...................................................... 10
6.6 Vertical Venting .......................................................... 10
6.7 Length Requirements ................................................ 10
6.8 Vent Material.............................................................. 11
6.9 Replacing an Existing Heater in a Venting System .... 11
SECTION 7: Air Supply......................................................... 15
7.1 Separated Combustion Installation............................. 15
7.2 Unvented Installation.................................................. 15
7.3 Building Ventilation..................................................... 15
7.4 Outside Combustion Air Supply.................................. 15
SECTION 8: Gas Piping........................................................16
8.1 Connections............................................................... 16
SECTION 9: Wiring................................................................ 17
9.1 Positioning Thermostats ............................................ 17
9.2 Low Voltage Thermostat with One Heater ................. 17
9.3 Internal Wiring Diagram .............................................18
9.4 Ladder Wiring Diagram.............................................. 19
9.5 Electrical Connection to the Heater ........................... 20
SECTION 10: Operation and Maintenance ..........................21
10.1 Pre-Start-Up Checks ................................................21
10.2 Begin Start-Up .........................................................21
10.3 Complete Start-Up ...................................................23
SECTION 11: User Instructions............................................24
11.1 User Instructions.......................................................24
11.2 Heater Operation ......................................................24
11.3 Lighting Instructions..................................................24
11.4 Simple Troubleshooting.............................................24
SECTION 12: Servicing.........................................................25
12.1 Servicing Instructions...............................................25
12.2 Burner Maintenance.................................................25
12.3 Heat Exchanger Maintenance ..................................25
12.4 Gas Valve Maintenance ...........................................25
12.5 Flue Blower ..............................................................25
12.6 Venting and Air Intake Pipe......................................25
12.7 Maintenance Checklist.............................................26
SECTION 13: Troubleshooting .............................................28
13.1 General ....................................................................28
13.2 Troubleshooting For Automatic Ignition Burner
Systems ...................................................................29
13.3 Troubleshooting for Flame Supervision System .......30
13.4 Troubleshooting for Gas Valves................................31
13.5 Troubleshooting for Flue Blower...............................31
SECTION 14: Replacement Parts.........................................32
14.1 Gas Valve .................................................................32
14.2 Burner Compartment ...............................................33
14.3 Ignition Electrode and Flame Probe.........................34
14.4 Heat Exchanger .......................................................35
14.5 Flue Blower .............................................................35
14.6 Pressure Switch........................................................36
14.7 Ignition Control.........................................................36
14.8 Limit Switches ..........................................................36
SECTION 15: Specifications.................................................37
15.1 Dimension Data........................................................37
15.2 General Technical Data Table ..................................38
15.3 Technical Data Table ................................................38
SECTION 16: The ROBERTS GORDON
UHD-Series Warranty.....................................39
®
COMBAT
®
Printed in U.S.A.
Page 4
Page 5
TABLE OF FIGURES
Figure 1: Clearances to Combustibles ......................................3
Figure 2: Air Flow Direction....................................................... 7
Figure 3: Suspension Methods .................................................8
Figure 4: Vent and Roof Detail................................................ 11
Figure 5: Standard Vented Heater - Vertical and Horizontal
Vent Termination......................................................12
Figure 6: Standard Vented Heater - Common Vertical Vent
Termination.............................................................. 12
Figure 7: Separated Combustion Heater - Vertical and
Horizontal Vent Termination..................................... 13
Figure 8: Concentric Vent Box ................................................13
Figure 9: Concentric Vertical and Horizontal Vent Termination -
Separated Combustion Heater ................................14
Figure 10: Gas Connection ..................................................... 16
Figure 11: Automatic Burner Control Sequence...................... 22
Figure 12: Gas Valve...............................................................22
Figure 13: LED Diagnostic Codes...........................................24
Page 6
Page 7
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 quarterly
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. Thin sheet metal parts,
including the various venting components, 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 appliance are compatible.
SECTION 1: HEATER SAFETY
1.1 Manpower Requirements
To prevent personal injury and damage to the
heater, two persons will be required for installation.
1
Page 8
UHD STANDARD DUCT FURNACE 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
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.
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.
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.
• 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 provide a method that ensures that the air flow
through the heat exchanger is within the
acceptable range indicated on the rating plate
prior to energizing the heater, and that such air
flow continues at least 90 seconds after the
heater is de-energized.
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 91039831) is illustrated
on the back cover.
Know your model number. Model number is found
on the heater and throughout the Installation,
Operation and Service Manual.
* 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.
2
Page 9
SECTION 3: CRITICAL CONSIDERATIONS
WARNING
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.
Failure to follow these instructions can
result in death, injury or property damage.
6"
(15 cm)
6"
(15 cm)
31"*
(79 cm)
6"
(15 cm)
Clearance to Vent: 2" (5 cm)
*31" (79 cm) minimum is necessary
for servicing.
3.1 Basic Information
UHD[X][S][R] heaters have automatic ignition
burners for ON/OFF operation only.
3.2 Manufactured Units
Gas-fired, power-vented duct furnace 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. Design and heat
exchanger alternatives shall be offered as follows:
• Separated Combustion: A separated
combustion unit shall feature an enclosed,
sealed burner box. A piece of flexible air duct
connects this burner box to a flange on the
cabinet. Combustion air should be ducted from
outside the heated space, with the ductwork
connecting to the unit with the use of the flange.
• Stainless Steel Heat Exchanger: A stainless
steel heat exchanger unit shall consist of heat
exchanger tubes, heat exchanger tube supports,
heat exchanger tube plates and vent box
produced of 409 stainless steel.
SECTION 3: CRITICAL CONSIDERATIONS
3.5 Clearances to Combustibles
Clearances must be as indicated on Page 3, Figure
1. If clearances to combustibles are not indicated,
then installation clearances apply.
Figure 1: Clearances to Combustibles
3.3 Location and Suspension
All models:
• Must be installed indoors.
• Must be installed on the positive pressure side of
the air circulation blower.
• 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 8,
Figure 3) or from wall brackets of sufficient
strength to support the heater as listed in the
Dimension Data Table on Page 37, Section 15.1.
• Must be installed in a manner which allows
access to all serviceable components.
See Page 3, Figure 1 for details.
3.4 Minimum Required Installation Clearances
Clearances around the heater and vent must be as
indicated on Page 3, Figure 1 and Page 11, Figure 4
through Page 14, Figure 9 to ensure access for
servicing, and correct operation.
3
Page 10
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
WARNING
Electrical Shock Hazard
Disconnect electrical 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.
3.6 Ventilation
WARNING
Carbon Monoxide Hazard
Heaters may be installed
vented or unvented.
Vented heaters must be
vented outdoors.
Unvented heaters must be
installed in buildings with
ventilation rates as per
section 6.4.
Failure to follow these
instructions can result in
death or injury.
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
9, Section 6.
3.8 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 17, Section 9.
3.7 Gas Supply
Fire Hazard
Connect gas supply according to Figure 10.
Do not use gas supply pipe and electrical
connections to support heater’s weight.
Gas can leak if not installed properly.
Failure to follow these instructions can
result in death, injury or property damage.
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. See Page 16, Section 8.
3.9 Vent
Choose heater orientation to allow for 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 9, Section 6.
4
Page 11
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 floorceiling 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.
5
Page 12
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
4.6 High Altitude
These heaters are CSA-approved (without
modifications) for installations up to 2000' (610
m) in US and Canada. CSA approved heaters
installed above 2000' (610 m) must be de-rated.
For installations above 2000' (610 m) in US,
consult factory for information on burner derating. 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 CSAapproved and must be approved by the local or
provincial authority.
6
Page 13
SECTION 5: DUCT HEATER INSTALLATION
SECTION 5: DUCT HEATER INSTALLATION
5.1 General
To connect the inlet and outlet ducts to the heater,
Duct-Mate or similar flanges may be slid over the
duct connector flanges supplied on the unit and
secured with screws. The connection to the duct
range shown on Page 7, Section 5.1.2. The minimum
inlet duct lengths shown on Page 7, Section 5.1.1
must be observed. Pressure drop through the heat
exchanger at various air flows is shown on Page 7,
Section 5.1.2.
Figure 2: Air Flow Direction
then can be made using the Duct-Mate clips. The
ducts must have removable access panels
upstream and downstream of the heater. These
panels must be of appropriate size and placement
so that smoke or reflected light could be observed to
indicate the presence of leaks in the heat
exchanger. Covers for these openings should be
sealed to prevent leakage.
Any transition into the inlet of the heater should be
smooth, with a taper of no more than 15°. If elbows
are required, they should be of either broad radius
or fitted with properly designed air turns. Consult a
professional to ensure air turns are properly
designed.
The heater must be installed on the positive
pressure side of the circulating air blower. Air flow
through the heater must be as shown on Page 7,
Figure 2 and may not be reversed. The air flow must
be adjusted such that it is within the acceptable
5.1.1 Minimum Inlet Duct Length
Model Duct Length Duct Size (W X H)
UHD[X][S][R] 150-175 52" (132 cm) 28" x 24" (71 cm x 60 cm)
UHD[X][S][R] 200-250 60" (162 cm) 28" x 32 1/4" (71 cm x 103 cm)
UHD[X][S][R] 300-400 75" (190 cm) 28" x 40 1/2" (71 cm x 82 cm)
5.1.2 Temperature Rise and Pressure Drop Ranges
UHD[X][S][R] 150 UHD[X][S][R] 175 UHD[X][S][R] 200 UHD[X][S][R] 225
Airflow
(CFM)
1,360 83 0.02 1,400 95 0.03 2,050 73 0.025 2,100 80 0.035
1,950 58 0.035 2,180 62 0.06 2,600 58 0.035 2,800 61 0.052
2,800 41 0.057 3,244 42 0.10 3,600 42 0.056 4,600 37 0.110
3,700 31 0.083 4,370 31 0.15 5,500 28 0.100 6,230 27 0.167
4,700 24 0.12 5,160 27 0.19 6,570 23.5 0.129 7,400 23 0.214
5,800 20 0.16 6,850 20 0.29 7,750 20 0.163 8,300 20 0.253
Airflow
(CFM)
2,350 80 0.05 2,700 23 0.02 3,120 86 0.03 3,420 86 0.04
3,000 63 0.07 4,735 50 0.06 4,880 56 0.07 5,200 57 0.08
4,400 43 0.13 6,813 35 0.12 6,612 41 0.123 6,700 45 0.13
5,900 32 0.19 8,000 30 0.17 9,140 30 0.23 8,850 34 0.21
7,625 25 0.28 9,300 26 0.22 10,500 26 0.30 11,600 26 0.36
8,850 22 0.35 10,200 86 0.27 13,600 22 0.48 14,200 22 0.53
Temperature
Rise (°F)
UHD[X][S][R] 250 UHD[X][S][R] 300 UHD[X][S][R] 350 UHD[X][S][R] 400
Temperature
Rise (°F)
Pressure
Drop
(in wc)
Pressure
Drop
(in wc)
Airflow
(CFM)
Airflow
(CFM)
Temperature
Rise (°F)
Temperature
Rise (°F)
Pressure
Drop
(in wc)
Pressure
Drop
(in wc)
Airflow
(CFM)
Airflow
(CFM)
Temperature
Rise (°F)
Temperature
Rise (°F)
Pressure
Drop
(in wc)
Pressure
Drop
(in wc)
Airflow
(CFM)
Airflow
(CFM)
Temperature
Rise (°F)
Temperature
Rise (°F)
Pressure
Pressure
Drop
(in wc)
Drop
(in wc)
7
Page 14
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
Nut
Washer
Riv
Nut
Ensure all suspension
hardware is torqued to
a minimum of 20 ft lbs.
Support Points
3/8"
Threaded
Rod
Cone Point
Set Pin
Window
Clamp
Unistrut
Unistrut
3/8"
Threaded
Rod
Washer
Nut
Channel Nut
NOTE: Duct
supports
not shown.
Duct supports
and duct are
not provided by
manufacturer.
5.1.3 Air Flow And Temperature Rise Ranges
Model Rate Air Flow Temperature Rise
UHD[X][S][R] 150 150,000 1,360 5,800 20 83
UHD[X][S][R] 175 175,000 1,400 6,850 20 95
UHD[X][S][R] 200 200,000 2,050 7,750 20 73
UHD[X][S][R] 225 225,000 2,100 8,300 20 80
UHD[X][S][R] 250 250,000 2,350 8,850 22 80
UHD[X][S][R] 300 300,000 2,700 10,200 23 86
UHD[X][S][R] 350 350,000 3,120 13,600 22 86
UHD[X][S][R] 400 385,000 3,420 14,200 22 86
(Btu/h) Minimum (CFM) Maximum (CFM) Minimum (°F) Maximum (°F)
5.2 Suspension
WARNING
Crush Hazard
Use 3/8" threaded rod
minimum.
Failure to follow these
instructions can result in
death, injury or property
damage.
Four suspension points (3/8" nuts) are located on
the top of the heater. Drop rods must be 3/8"
diameter mild steel.
Figure 3: Suspension Methods
When handling or supporting the heater from below,
ensure that the weight is taken at the support points.
For typical suspension, See Page 8, Figure 3.
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 accesible for servicing.
The heater must be installed in accordance with
clearances to combustibles as indicated on the wall
tag and in this manual.
8
Page 15
SECTION 6: VENTING
WARNING
Carbon Monoxide Hazard
Heaters may be installed
vented or unvented.
Vented heaters must be
vented outdoors.
Unvented heaters must be
installed in buildings with
ventilation rates as per
section 6.4.
Failure to follow these
instructions can result in
death or injury.
SECTION 6: VENTING
6.1 Changing Vent and Air Intake Orientation
The heater is sold with rear horizontal vent and air
intake connections. (Only separated combustion
models have air intake connection.)
6.2 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 10, Section 6.4 for further information.
Unvented operation also requires compliance with
the clearances to combustibles given on Page 3,
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).
6.2.1 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.
6.2.2 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.
6.3 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 3, Section
3.5. 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 11, Figure 4 through Page 14,
Figure 9. 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.
9
Page 16
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
WARNING
Carbon Monoxide Hazard
Heaters may be installed
vented or unvented.
Vented heaters must be
vented outdoors.
Unvented heaters must be
installed in buildings with
ventilation rates as per
section 6.4.
Failure to follow these
instructions can result in
death or injury.
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 11, Figure 4 through
Page 14, Figure 9.
6.3.1 Standard Vented Heaters
(Models UHD[X][R] 150 - 400)
The vent must be fitted with a low resistance
terminal. See Page 11, Figure 4 through Page 12,
Figure 5. Standard vented heaters do not allow
outdoor air intake for combustion air.
6.3.2 Separated Combustion Heaters
(Models UHD[X]S[R] 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 14, Figure 9. 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. See Page 13,
Figure 8 and Page 14, Figure 9.
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
terminate at approved wall and roof terminals.
Separated combustion units may not be common
vented. See Page 9, Section 6.
6.4 Unvented Operation
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.
6.5 Horizontal Venting
Horizontally vented heaters must be individually
vented.
Vent pipe must be sloped ¼" (.6 cm) downward 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.
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).
6.6 Vertical Venting
Vertically-vented standard-vented heaters can be
common vented (up to four 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 12, Figure 6.
A vent shall not extend less than 2' (.6m) above the
highest point where it passes through a flat roof of a
building.
This heater is not approved to be installed in
residential buildings.
For unvented operation in commercial installations,
sufficient building ventilation must be provided in the
amount of 4 cfm per 1000 Btu/h firing rate (United
10
6.7 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.
Page 17
SECTION 6: VENTING
The entire vent should be insulated with foil faced
fiberglass insulation (1/2" thick, 1-1/2# density
minimum).
6.7.1 Maximum Vent Lengths
Model UHD[X][S][R] 150 - 400 Number of Elbows
40 ft (12.2 m) 1
35 ft (10.7 m) 2
30 ft (9.1 m) 3
25 ft (7.6 m) 4
20 ft (6.1 m) 5
6.8 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 9, Section
6.3.
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.
6.9 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 appliance connected to
the venting system placed in operation, while any
other appliances 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
appliance(s) 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
appliance being inspected in operation.
Adjust thermostat so that the appliance will
operate continuously.
5. For any appliance having a draft hood, test for
draft hood appliance 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
appliance connected to the venting system
properly vents when tested as outlined above,
return doors, windows, exhaust fans, fireplace
dampers and any other gas-burning appliances
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 4: Vent and Roof Detail
11
Page 18
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
Model Vent Diameter Part Number
UHD[X][R] 150 - 400 4" (10 cm) 90502102
Figure 5: Standard Vented Heater - Vertical and Horizontal Vent Termination
Figure 6: Standard Vented Heater - Common Vertical Vent Termination
12
Page 19
Figure 7: Separated Combustion Heater - Vertical and Horizontal Vent Termination
Vent
Termination
12" (31 cm)
Minimum from
air inlet to vent
termination (may be
horizontal or vertical
clearance).
Air Intake
Termination
Vent
Air Intake*
Vertical
Option Horizontal
Option
90°
Bend
12" (31 cm)
Minimum from wall
to vent termination.
12" (31 cm) Minimum from air inlet to
vent termination (may be horizontal
or vertical clearance).
Listed Thimble
through Combustible
Wall
Vent
Air Intake
Condensate
Trap to Drain
(Optional)
NOTE: Vent supports not
shown. Duct supports
not shown. Duct and
vent supports not
provided by the
manufacturer.
12" (31 cm)
Minimum from
wall to vent
termination.
Model Vent Diameter Terminal P/N
UHD[X]S[R] 150 - 400 4" (10 cm) 90502102
Model *Air Intake Diameter Terminal P/N
UHD[X]S[R] 150 - 250 4" (10 cm) 90502102
UHD[X]S[R] 300 - 400 5" (13 cm) 90502105
SECTION 6: VENTING
Figure 8: Concentric Vent Box
4" (10 cm) or
5" (13 cm)
Seal joint between single wall
and Type B vent with
silicone sealant.
Combustion Air
to Heater
Exhaust
from Heater
4" (10 cm) Single
Wall Vent Pipe
(By Others)
One piece of 4" (10 cm) dia, 1/4" (6 cm)
airspace type “B” vent. Selkirk Model RV
or equivalent. (By others)
Use 3 sheetmetal
screws equally
spaced around joint.
Use 3 sheetmetal
screws equally
spaced around collar.
Concentric
Vent Box
To ward
Outside
6" (15 cm) Single
Wall Inlet Air Pipe
(By Others)
13
Page 20
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
Description Part Number Qty.
Concentric Vent Kit (150 - 250) UHVK1
Concentric Vent Box Top & Side Assembly 90504113 1
Concentric Vent Box Bottom Assembly 90504112 1
Screw #6 x 3/8 Self Drilling 91119100 14
4" (10 cm) Vent Terminal with Baffle Plate 90502102R 1
6" (15 cm) Combustion Air Terminal 90502103 1
Description Part Number Qty.
Concentric Vent Kit (300 - 400) UHVK2
Concentric Vent Box Top & Side Assembly 90504013 1
Concentric Vent Box Bottom Assembly 90504012 1
Screw #6 x 3/8 Self Drilling 91119100 14
4" (10 cm) Vent Terminal with Baffle Plate 90502102R 1
8" (20 cm) Combustion Air Terminal 90502104 1
Model Vent Diameter
UHD[X]S[R] 150 - 400 4" (10 cm)
Model *Air Intake Diameter
UHD[X]S[R] 150 - 250 4" (10 cm)
UHD[X]S[R] 300 - 400 5" (13 cm)
Figure 9: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater
14
Page 21
SECTION 7: AIR SUPPLY
7.1 Separated Combustion Installation
When installed as a separated combustion heater
(UHD[X]S[R]), the air for combustion is drawn in
from outside the building.
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.
SECTION 7: AIR SUPPLY
7.4 Outside Combustion Air Supply
If outside combustion air supply is required,
separated combustion model (UHD[X]S[R]) heaters
must be used.
Caution: 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 flexible air 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 10, Section
6.7.
15
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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
Do not bend flexible
gas connector
sharply.
• Hold gas nipple
securely with pipe
wrench when
attaching the flexible
gas connector.
• Do not twist
flexible gas
connector.
• Ensure all
joints are
gas tight.
SECTION 8: GAS PIPING
• 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
Fire Hazard
Connect gas supply according to Figure 10.
1/2" wc. 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
Do not use gas supply pipe and electrical
connections to support heater’s weight.
Gas can leak if not installed properly.
heater.
• A minimum 1/8" NPT plugged tapping
accessible for test connection must be installed
immediately upstream of the gas supply
Failure to follow these instructions can
result in death, injury or property damage.
connection to the heater.
• For suspended heaters, an approved metal
flexible connection between the isolating valve
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.
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.
Caution: Do not high pressure (in excess of 1/2 psi
[14" wc]) 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"
8.1 Connections
Connect the heater to the gas supply ensuring that
the final connections are as follows:
wc).
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 10: Gas Connection
16
Page 23
SECTION 9: WIRING
WARNING
Electrical Shock Hazard
Disconnect electrical 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/1Ø/60 Hz
power supply. Check heater 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.
SECTION 9: WIRING
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
Canada: refer to Canadian Electrical Code CSA
C22.1 Part I - latest revision.
9.1 Positioning Thermostats
A room thermostat 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.
See Page 2, Section 2.1 for wall tag details.
®
NFPA 70 - latest revision
9.2 Low Voltage Thermostat with One Heater
17
Page 24
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
IMPORTANT:
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
(221 °F) and 600 V. For supply connections, use No. 14 AWG or larger wires.
BLUE
BLACK
ORANGE
ORANGE
YELLOW
BROWN
WHITE
WHITE
L2
L1
ORANGE
ORANGE
BLACK
BLACK
GREEN
WHITE
BLUE
BLACK
GREEN
BLUE
GREEN
YELLOW
24 VAC
HOT
GROUND
FLAME
BLACK
BLACK
6
3
4
2
1
45
31
SENSE
ELECTRODE
LIMIT SWITCH
PRESSURE SWITCH
GAS VALVE
IGNITION MODULE
TRANSFORMER
LIMIT SWITCH (UHD 300, 350, 400 ONLY)
MANUAL RESET LIMIT SWITCH (RESIDENTAL UNITS ONLY)
THERMOSTAT INPUT: FIELD SUPPLIED
R = 24 VAC TO THERMOSTAT (RED)
G = MANUAL FAN INPUT FROM THERMOSTAT (GREEN)
W = HEAT DEMAND INPUT FROM THERMOSTAT (WHITE)
C = COMMON GROUND TO THERMOSTAT
FLUE
BLOWER
R
G
W
C
ACC
L1
CMB BLOWER
5
9.3 Internal Wiring Diagram
18
Page 25
9.4 Ladder Wiring Diagram
IMPORTANT:
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
(221 °F) and 600 V. For supply connections, use No. 14 AWG or larger wires.
FLAME
SENSOR
PRESSURE SWITCH
THERMOSTAT CONNECTION
6
3
4
5
2
1
120 VAC
TRANSFORMER
FLUE BLOWER
GAS
VALVE
ELECTRODE
IGNITION
MODULE
FLAME
SPARK
LIMIT SWITCH
LIMIT SWITCH (UHD 300, 350, 400 ONLY)
MANUAL RESET LIMIT SWITCH
(UHD 75 - 125 ONLY)
FLUE BLOWER
SECTION 9: WIRING
19
Page 26
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
BX Connector
Junction Box
Flexible Conduit
Burner
Connect wires together
with suitable approved
wire connectors.
Green to Ground
White to L2
Black to L1
L1
L2
Ground
Black
White
Green
9.5 Electrical Connection to the Heater
IMPORTANT: Junction box is not provided with heater.
Conduit can also be attached directly to heater with wire junction made within the heater cabinet.
20
Page 27
SECTION 10: OPERATION AND MAINTENANCE
WARNING
Explosion Hazard
Installation, service and annual inspection
must be done by a contractor qualified in
the installation and service of gas-fired
heating equipment or your gas supplier.
Turn off gas and electrical supplies before
performing service or maintenance.
Failure to follow these instructions can
result in death, injury or property damage.
SECTION 10: OPERATION AND MAINTENANCE
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 22, Figure 11.
There will be no ignition of the burner and lockout
will occur, which proves the controls are operating
correctly.
Read this manual carefully before installation,
operation, or service of this equipment. All
components are accessed via the door secured by
four sheet metal screws. Opening the door exposes
live electrical connections and hot components.
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 Electrical Checks
1. Check that all site wiring is connected in
accordance with the appropriate wiring diagram
on Page 18, Section 9.3.
10.1.2 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.
10.1.3 Mechanical Checks
1. Check that the flue (and air intake for separated
combustion units) is installed in accordance
with these instructions and local regulations.
21
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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
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.
½PSI IN
C
ON
OFF
Regulator
Outlet
Pressure
Gas Inlet
Inlet Pressure
TOP VIEW
END VIEW
Description Part Number
Gas Valve 150 - 225 NG 90032505
Gas Valve 150 - 225 LP 90032506
Gas Valve 250 - 400 NG 90032520
Gas Valve 250 - 400 LP 90032521
Figure 11: Automatic Burner Control Sequence
Burner Sequence for Ignition Control
Thermostat 24 V
RUNSTART
SHUT DOWN
Flue Blower
NO
Pressure
Switch
Ignition Spark
Start Gas Valve
Flame Signal
P
C
NC
*Purge time begins at pressure switch change over.
Required Incoming Signals
Signals Output By Control
Figure 12: Gas Valve
30 Seconds Purge*
30 Seconds Post Purge
ts = 10 Seconds
22
Page 29
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 38, Section 15.2.
IMPORTANT: If the correct burner pressure cannot
be reached, then check the inlet pressure to the
valve with the burner firing. See Technical Data
Ta bl e s on Page 38, Section 15.2 for inlet pressure
requirement.
Do not continue to adjust the regulator if the
pressure is not changing.
correctly. Set the switches (if fitted) and
thermostat(s) to the users’ requirements.
10.3 Complete 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 3, Figure 1 and the user
instructions on Page 24, Section 11 through Page
24, Section 11.4 and all warnings defined in this
manual.
If the inlet pressure is too low to allow correct burner
pressure setting, then the gas inlet pressure must be
corrected before completing the start-up.
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.
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
23
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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 11: USER INSTRUCTIONS
WARNING
Explosion Hazard
Installation, service and annual inspection
must be done by a contractor qualified in
the installation and service of gas-fired
heating equipment or your gas supplier.
Turn off gas and electrical supplies before
performing service or maintenance.
Failure to follow these instructions can
result in death, injury or property damage.
11.1 User Instructions
The UHD[X][S][R] Series heaters are fully automatic
and operate from the external controls fitted on site.
11.3.2 To Turn Heater Off
Set the thermostat to the
"OFF" position.
The burner will turn off immediately.
To restart, turn the thermostat above room
temperature.
11.4 Simple Troubleshooting
Some possible reasons for the heater not operating
are:
1. Gas supply not
2. Electricity supply not
"ON".
"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.
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.
11.2 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".
IMPORTANT: The thermostat setting must be above
the ambient temperature for the heater to operate.
The automatic firing sequence will begin as
described on Page 22, Figure 11. The heater will
now operate automatically under the control of the
on site controls.
11.4.1 Simple Troubleshooting (Burner Faults)
If the burner fails to ignite for any reason, it will retry
for ignition (four trials total). After four unsuccessful
ignition trials, the control will put the heater into
lockout for one 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 Page 24, Figure 13 for LED
indication codes.
Figure 13: 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
Switch Open
5 Flashes Flame Sense Error - Gas valve not energized.
Steady On Internal Control Failure
24
Page 31
SECTION 12: SERVICING
WARNING
Explosion Hazard
Installation, service and annual inspection
must be done by a contractor qualified in
the installation and service of gas-fired
heating equipment or your gas supplier.
Turn off gas and electrical supplies before
performing service or maintenance.
Failure to follow these instructions can
result in death, injury or property damage.
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 required.
IMPORTANT: After any maintenance or repair work,
always test fire the heater in accordance with the
start-up instructions on Page 21, Section 10 through
Page 23, 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 28, Section 13
through Page 31, Section 13.5.
IMPORTANT: 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.
IMPORTANT: Inspect all suspended components
and hardware. Ensure that they are in good
condition, properly tightened, and corrosion free.
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 required.
12.3 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.
12.4 Gas Valve Maintenance
No regular maintenance is required on this device.
To change gas control valves, See Page 32, Section
14.1.
Do not repair or disassemble gas valve.
Replace faulty gas valves with replacement parts
sold and supplied by Roberts-Gordon.
12.5 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 14.5). Ensure that the fan is free to run and
that the fan wheel is clean.
12.6 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
sure any insulation is not missing or in poor
condition. Replace as required. Check all venting
and air intake components to ensure they are in
good condition, gas tight and corrosion-free.
12.2 Burner Maintenance
1. Open the door and remove the burner
compartment cover. See Page 33, Section
14.2.
2. Clean any deposits from the main burner which
may have formed in the injectors or venturi of
the burner. See Page 33, Section 14.2.
25
Page 32
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
12.7 Maintenance Checklist
WARNING
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
®
manuals and all applicable
Explosion Hazard
GORDON
governmental authorities pertaining to the
installation, service and operation of the equipment.
Installation, service and annual inspection
must be done by a contractor qualified in
the installation and service of gas-fired
heating equipment or your gas supplier.
To help facilitate optimum performance and safety,
Roberts-Gordon recommends that a qualified
contractor annually inspect your ROBERTS
Turn off gas and electrical supplies before
performing service or maintenance.
Failure to follow these instructions can
GORDON
necessary, using only replacement parts sold and
supplied by Roberts-Gordon.
®
equipment and perform service where
result in death, 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 tubes.
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 15, 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.
Make sure there is no sagging, bending or distortion.
Clean or replace as required.
See Page 16, Section 8.
26
Page 33
SECTION 12: SERVICING
Gas Line and Shut-off
Valves
Burner Observation
Window
Flue Blower Scroll, Wheel
Check for gas leaks.
See Page 16, Section 8.
Make sure it is clean and free of cracks or holes.
Clean and replace as required.
Compressed air or a vacuum cleaner may be used to clean dust and dirt.
and Motor
Inshot Burners and
Orifices
Clear obstructions (even spider webs will cause problems).
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 17, Section 9.
Suspension Points Make sure the heater is hanging securely.
Look for signs of wear on the suspension materials or ceiling.
See Page 8, Figure 3.
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
Flush drain and clear any obstructions.
(when installed)
Ductwork Consult an indoor air quality professional for proper cleaning procedures
Air Circulation Blower For a complete inspection, refer the manufacturers Installation, Operation and
Service manual.
Wall Tag If wall tag is present, make sure it is legible and accurate. Please contact
®
Roberts-Gordon LLC or your ROBERTS-GORDON
independent distributor if
you need a wall tag. See Page 2, Section 2.1.
27
Page 34
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
Fan and limit switch are
operating normally.
Replace temperature limit
switch.
Ensure air flow through
heat exchanger is
appropriate per the rating
plate.
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
Heater Operating
TROUBLESHOOT ENDS.
No
The limit switch has
tripped. See Manual Reset
Limit Switch Figure.
No
Use Troubleshooting for
Automatic Ignition Burner
Systems section to test burner.
Has burner “Locked Out”?
Ye s
No
With external controls (i.e.
thermostat) on, does the
burner continue through the
heating cycle?
No
Ye s
Does the flue blower run?
No
Use Troubleshooting for
Flue Blower section to test
fan.
Ye s
Ye s
Burner has locked out due
to ignition failure. Use
Tro ubleshooting for Automatic
Ignition Burner Systems
section to test burner.
Is ignition control showing a
"2 flashes" LED code?
Ye s
No
Ye s
START
Ye s
Wait 10 - 15 minutes for
limit switch to cool. Does
fan stop running?
No
Turn on supplies.
Are gas & electrical
supplies on?
Ye s
Is ignition control showing a
"4 flashes" LED code?
Ye s
No
Ye s
No
WARNING
Explosion Hazard
Installation, service and annual inspection
must be done by a contractor qualified in
the installation and service of gas-fired
heating equipment or your gas supplier.
Turn off gas and electrical supplies before
performing service or maintenance.
Failure to follow these instructions can
result in death, injury or property damage.
SECTION 13: TROUBLESHOOTING
13.1 General
28
Page 35
13.2 Troubleshooting For Automatic Ignition Burner Systems
For optimum heater performance, use only replacement parts sold and supplied by Roberts-Gordon.
Conduct start-up procedure as shown on Page 21, Section 10.
START
SECTION 13: TROUBLESHOOTING
Are gas & electrical
supplies on?
Ye s
Are external controls
(i.e. Thermostat) on?
Ye s
Is ignition control showing a
"4 flashes" LED code?
No
Does flue blower run?
No
No
No
Turn on supplies.
Turn on controls.
Wait 10 - 15 minutes for
limit switch to cool. Does
Ye s
fan stop running?
No
Replace temperature limit
switch.
Is 120 V supply at fan
connections?
No
Ye s
Fan and limit switch are
Ye s
operating normally.
Flue blower faulty;
replace
Ye s
Does air pressure switch
change over?
Ye s
Wait 30 - 40 seconds.
Does ignition spark
operate?
Ye s
Does the flame light?
Ye s
Is ignition control showing
a "2 flashes" LED code?
No
Heater Operating
TROUBLESHOOT ENDS.
Burner control faulty or wiring
connections faulty. Repair
or replace as required
Check for too much vent/air inlet duct. Check for blockage in
vent and combustion air circuit. Check for faulty air pressure
No
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.
No
No
Ye s
No
Is ignition lead okay and
connected?
Is spark electrode okay?
Is the gas valve operating?
To test valve, See
Tro ubleshooting for Gas
Valves section.
Is the flame current at
least 1 μAmp DC when
the flame ignites?
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
Ye s
No
Ye s
Ignition control faulty;
replace.
See Ignition Control section.
Replace valve.
Trace fault in supervision
system. See
Tro ubleshooting
for Flame Supervision
System section.
29
Page 36
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.
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.
Repair or replace as
required.
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
Replace ignition control.
Use General
Tro ubleshooting section to
trace the fault.
Heater Operating
TROUBLESHOOT ENDS.
No
Repair or replace as
required.
Is inlet burner gas pressure
correct? Is live and neutral
polarity correct? Is
flame probe circuit correct?
Is there a current flowing in
the flame probe circuit with
no flame present?
Ye s
No
Does “lockout” occur when
there is a flame present?
Ye s
Is the connecting lead
damaged? Is the flame probe
damaged or touching earthed
components?
No
Is the flame present and
at least 1 μA DC flame
current?
Connect a DC ammeter in
series with the flame probe.
Ye s
No
Ye s
Ye s
No
START
13.3 Troubleshooting for Flame Supervision System
30
Page 37
13.4 Troubleshooting for Gas Valves
For optimum heater performance, use only replacement parts sold and supplied by Roberts-Gordon.
Conduct start-up procedure as shown on Page 21, Section 10.
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
Blower Operating
TROUBLESHOOT ENDS.
No
Blower motor faulty.
Replace with correct type.
Check blower motor leads
for loose connections.
Correct power
supply problem.
Ye s
START
Does blower turn on and
off while burner is firing
continuously?
No
Ye s
Does flue blower run
automatically when there
is a call for heat?
No
Ye s
START
SECTION 13: TROUBLESHOOTING
Is gas pressure at inlet of the
valve correct for gas type?
Note pressure found.
Ye s
Does gas pressure at outlet
of the valve rise when
valve turns on?
Ye s
Ye s
Does gas pressure at
outlet of valve return to zero or
lower when valve turns off?
Ye s
Valve Operating
TROUBLESHOOT ENDS.
13.5 Troubleshooting for Flue Blower
No
No
No
No
Fault elsewhere.
Correct pressure problem.
Valve or ignition control
faulty. Replace with
one of correct type.
Valve faulty.
Replace with one of
correct type.
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
31
Page 38
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
WARNING
Explosion Hazard
Installation, service and annual inspection
must be done by a contractor qualified in
the installation and service of gas-fired
heating equipment or your gas supplier.
Turn off gas and electrical supplies before
performing service or maintenance.
Failure to follow these instructions can
result in death, injury or property damage.
½PSI IN
C
ON
OFF
Flexible
Air Duct
NOTE: Separated combustion model shown.
Description Part Number
Gas Valve, NG (Models UHD[X][S][R] 150 - 225) 90032505
Gas Valve, LP (Models UHD[X][S][R] 150 - 225) 90032506
Gas Valve, NG (Models UHD[X][S][R] 250 - 400) 90032520
Gas Valve, LP (ModelsUHD[X][S][R] 250 - 400) 90032521
SECTION 14: REPLACEMENT 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.
Follow steps in Section 14.2 and See Page 33,
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 23, Section 10.2.2.
IT IS IMPORTANT THAT ONLY THE CORRECT
GAS VALVE IS USED WHEN REPLACING THESE
CONTROLS.
See warnings and important information on Page
25, Section 12 before removing or replacing parts.
32
Page 39
14.2 Burner Compartment
Remove flexible
air duct from spigot
Remove
access plate
Remove screws and
pull off burner
compartment cover
Viewing port
for flame probe
Viewing port
for ignition electrode
Flame Probe
Burner
Compartment
Cover
Rubber Seal
Ignition Electrode
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.
NOTE: Separated combustion
model shown.
Remove manifold
screws and pull
out manifold
Manifold
Inshot
Burners
Injectors
Burner
Screws
Burner
venturi
Unscrew
Orfices
Manifold
Marking
Folded
Hem
Ensure gas tight fitting of injectors.
Ensure correct alignment with burners.
Ensure all pipe joints are gas tight.
SECTION 14: REPLACEMENT PARTS
14.2.1 Burner Injectors
MODEL
Orifice
Quantity
Natural Gas (G20)
Orifice
Marking 43 43 2.25 mm 2.25 mm 2.25 mm 40 40 40
P/N 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
UHD[X][S][R]
150
7 8 9 10 11 12 14 14
UHD[X][S][R]
175
UHD[X][S][R]
200
UHD[X][S][R]
225
UHD[X][S][R]
250
UHD[X][S][R]
300
UHD[X][S][R]
350
UHD[X][S][R]
400
33
Page 40
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
Description Part Number Qty.
Spark Electrode 90427411 1
Automatic Ignition Flame Probe 90439300 1
Transformer 90436900K 1
Ignition Module 90434008 1
Inshot Burners UHD[X][S][R] 150 92000001 7
Inshot Burners UHD[X][S][R] 175 92000001 8
Inshot Burners UHD[X][S][R] 200 92000000 9
Inshot Burners UHD[X][S][R] 225 92000000 10
Inshot Burners UHD[X][S][R] 250 92000000 11
Inshot Burners UHD[X][S][R] 300 92000000 12
Inshot Burners UHD[X][S][R] 350 92000000 14
Inshot Burners UHD[X][S][R] 400 92000002 14
Limit Switch (150 - 400) 90412103 1
Limit Switch (300 - 400) 90412105 1
Limit Switch (175) 90412107 1
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.
14.3 Ignition Electrode and Flame Probe
34
Page 41
SECTION 14: REPLACEMENT PARTS
Remove screws securing
outlet flange to the flue
adapter.
Refit in reverse order.
Remove screws securing flue
blower mounting plate to vent
box.
Remove screws securing
mounting plate to blower.
Refit in reverse.
Use new gaskets.
Ensure sealed joints.
Ensure mounting plate orifice
is clear and not obstructed.
14.4 Heat Exchanger
The heat exchanger consists of a four-pass design with 1.75" outer diameter [409 stainless steel] tube. The
tube plates are made of [aluminized steel] [409 stainless steel]. The tube supports are made of
[galvannealed steel] [409 stainless steel].
14.5 Flue Blower
UHD[X][S][R]
MODEL
Flue Blower P/N 90710405 90710403 90710402
150 - 175
UHD[X][S][R]
200 - 300
UHD[X][S][R]
350 - 400
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 a flue blower. See Page 24, Section 11.
35
Page 42
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
14.6 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.
Carry out a start-up after working on or changing a pressure switch. See Page 21, Section 10.
MODEL
Pressure Switch
Kit P/N
Color Code yellow orange gray brown orange
Set Point (in wc) .32 .79 .41 .68 .79
Pressure Switch
Snap Ring P/N 90439850 90439850 90439850 90439850 90439850
UHD[X][S][R]
150 - 175
90439802 90439808 90439803 90439807 90439808
UHD[X][S][R]
200 - 225
UHD[X][S][R]
250
UHD[X][S][R]
300 - 350
UHD[X][S][R]
400
14.7 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.
14.8 Limit Switches
14.8.1 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.
4. Reconnect the electrical connections and test operation.
36
Page 43
SECTION 15: SPECIFICATIONS
2.4"
(6 cm)
A
B
REAR VIEW
END VIEW
H
J
TOP VIEW
Heater must be supported
at these points from
aboveor below.
4 x 3/8" Captive Nuts Provided
Electrical
Supply
Air Intake
(UHD[X][S][R]
only)
Flue
25.5"
(65 cm)
F
19.4"
(49 cm)
Thermostat
Connection
Gas
Supply
6.5"
(17 cm)
K
L
G
C
C
M
C
C
E
D
M
Support
Centers
15.1 Dimension Data
SECTION 15: SPECIFICATIONS
UHD
Model
[X][S][R]
150
A
Width
B
Height
Duct Connector
C
Flange
D
Support Spacing
E
Support Spacing
F
Support Spacing
G
Center of Flue
Center of
H
Flue/Air Intake
J
Position of Flue
K
L
M
Gas Inlet Position
Position of Electrical
Supply
Minimum Inlet Duct
Length
Weight lb. 191 211 239 249 254 325 345 345
in
(cm)
in
(cm)
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)
1. 2 5
(3)
12.3
(31)
12.4
(32)
17.7
(45)
15.5
(39)
5.5
(14)
8.2
(21)
5.8
(15)
3.0
(8)
52
(132)
UHD
[X][S][R]
175
42.4
(108)
26.9
(68)
1. 2 5
(3)
12.3
(31)
12.4
(32)
17.7
(45)
15.5
(39)
5.5
(14)
8.2
(21)
5.8
(15)
3.0
(8)
52
(132)
UHD
[X][S][R]
200
42.4
(108)
35.2
(89)
1. 2 5
(3)
12.3
(31)
12.4
(32)
17.7
(45)
17.5
(44)
6.4
(16)
8.8
(22)
5.8
(15)
7. 6
(19)
60
(162)
[X][S][R]
UHD
225
42.4
(108)
35.2
(89)
1. 2 5
(3)
12.3
(31)
12.4
(32)
17.7
(45)
17.5
(44)
6.4
(16)
8.8
(22)
5.8
(15)
7. 6
(19)
60
(162)
UHD
[X][S][R]
250
42.4
(108)
35.2
(89)
1. 2 5
(3)
12.3
(31)
12.4
(32)
17. 7
(45)
17. 5
(44)
6.4
(16)
8.8
(22)
5.8
(15)
7. 6
(19)
60
(162)
UHD
[X][S][R]
300
52.3
(133)
43.5
(110)
1. 2 5
(3)
12.3
(31)
15.3
(39)
24.7
(63)
13.8
(35)
7. 0
(18)
11
(28)
5.8
(15)
10.1
(26)
75
(190)
UHD
[X][S][R]
350
52.3
(133)
43.5
(110)
1. 2 5
(3)
12.3
(31)
15.3
(39)
124.7
(63)
13.8
(35)
7. 0
(18)
11
(28)
5.8
(15)
10. 1
(26)
75
(190)
UHD
[X][S][R]
400
52.3
(133)
43.5
(110)
1. 2 5
(3)
12.3
(31)
15.3
(39)
24.7
(63)
13.8
(35)
7. 0
(18)
11
(28)
5.8
(15)
10. 1
(26)
75
(190)
37
Page 44
UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
15.2 General Technical Data Table
UHD
°F
(°C)
°F
(°C)
in
in
[X][S][R]
150
83
(28)
20
(7)
4 - All Models
(10)
4
(10)
Model
Full Load Amps @ 115 V A 2 2 2 2 2 2 6 6
Minimum Air Volume CFM 1360 1400 2050 2100 2350 2700 3120 3420
Temperature Rise @
Minimum Air Volume
Heat Exchanger Pressure
Drop @ Minimum Air Volume in wc 0.02 0.03 0.025 0.035 0.05 0.02 0.03 0.04
Maximum Air Volume CFM 5800 6850 7750 8300 8850 10200 13600 14200
Temperature Rise @
Maximum Air Volume
Heat Exchanger Pressure
Drop @Maximum Air Volume in wc 0.16 0.29 0.163 0.253 0.35 0.27 0.48 0.53
Flue Size*
Air Intake*
(cm)
(cm)
* Do not exceed the maximum length of flue stated or heater may not operate properly.
UHD
[X][S][R]
175
95
(35)
20
(7)
4
(10)
UHD
[X][S][R]
200
73
(23)
20
(7)
4
(10)
UHD
[X][S][R]
225
80
(27)
20
(7)
4
(10)
UHD
[X][S][R]
250
80
(27)
22
(6)
4
(10)
UHD
[X][S][R]
300
86
(30)
23
(5)
5
(13)
UHD
[X][S][R]
350
86
(30)
22
(6)
5
(13)
UHD
[X][S][R]
400
86
(30)
22
(6)
5
(13)
15.3 Technical Data Table
Model
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
Efficiency % 82 - All Models
Natural Gas (G20) Data - Inlet Pressure 5.0 in wc Min., 14 in wc Max.
Burner Pressure in wc 3.2 3.4 3.7 3.7 4.0 2.7 2.7 3.3
LPG / Propane (G31) Data - Inlet Pressure 12.0 in wc Min., 14 in wc Max.
Burner Pressure in wc 9.9 10.4 10.5 10.7 10.5 9.4 9.3 11.1
UHD
[X][S][R]
150
UHD
[X][S][R]
175
UHD
[X][S][R]
200
UHD
[X][S][R]
225
UHD
[X][S][R]
250
UHD
[X][S][R]
300
UHD
[X][S][R]]
350
UHD
[X][S][R]
400
38
Page 45
SECTION 16: THE ROBERTS GORDON® COMBAT® UHD-SERIES WARRANTY
SECTION 16: THE ROBERTS GORDON
®
COMBAT® UHD-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® UHD-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
way.
• Use of the ROBERTS GORDON
Series 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® UHD-Series as directed in the
Installation, Operation and Service manual.
• Relocation of the ROBERTS GORDON
UHD-Series after initial installation
• The use of the ROBERTS GORDON
UHD-Series in a corrosive atmosphere containing
contaminants.
• The use of the ROBERTS GORDON
UHD-Series in the vicinity of a combustible or
explosive material.
• Any defect in the ROBERTS GORDON
UHD-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.
®
COMBAT® UHD-Series in any
®
COMBAT® UHD-
®
COMBAT
®
COMBAT
®
COMBAT
®
COMBAT
®
®
®
®
The data plate and/or serial number are removed,
defaced, modified or altered in any way.
The ownership of the ROBERTS GORDON
®
COMBAT
UHD-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 . B o x 4 4
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® UHD-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® UHD-Series is not
installed by an contractor qualified in the installation and
service of gas-fired heating equipment.
You cannot prove original purchase date and required
annual maintenance history.
39
Page 46
Page 47
Warm Air Heating
OWNER WARRANTY REGISTRATION CARD
®
Roberts Gordon LLC • 1250 William Street, P.O. Box 44 • Buffalo, NY 14240-0044 • Phone: 716-852-4400 • Fax: 716-852-0854
About the Owner:
Name:__________________________________________________________________________________________________
Address:______________________________________City:_________________________ State:__________Zip Code:________
Phone:_________________________ Fax:_________________________ E-mail:______________________________________
About the Installer:
Name:__________________________________________________________________________________________________
Address:______________________________________City:_________________________ State:_________Zip Code:_________
Phone:__________________________Fax:_________________________ E-mail:______________________________________
Purchased From (if different than installer):
Name:__________________________________________________________________________________________________
Address:______________________________________City:_________________________ State:__________Zip Code:________
Phone:_________________________ Fax:_________________________ E-mail:______________________________________
About your Heater:
Model#:_______________________ Serial #:___________________________ Fuel:____________ Installation Date:__________
Type of Installation (check one):
o Automotive o Manufacturing o Warehouse o Recreational o Aircraft
o Public Building o Office o Retail o Agricultural o Other______________
Toll Free: 800-828-7450 • www.rg-inc.com
Mail or Fax to:
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
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
Roberts-Gordon.
These products are not approved for residential use.
© 2008 Roberts-Gordon LLC - All rights reserved. No part of this work covered by the copyrights herein my be reproduced or
copied in any form or by any means – graphic, elect
recording, taping, or information storage and retrieval systems – without written permission of
Roberts Gordon LLC.
®
equipment and perform service where necessary, using only replacement parts sold and supplied by
®
manuals and all applicable governmental authorities pertaining to the
ronic, or mechanical, including photcopying,
Printed in the U.S.A.
Page 48
Page 49
Page 50
Attach this information to the wall near the ROBERTS GORDON
®
heater
®
Read the Installation, Operation and Service Manual thoroughly before installation, operation or service.
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
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 of gas-fired heating equipment.
Top
Clearances to Combustibles
WARNING
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.
Failure to follow these instructions can result in
death, injury or property damage.
Top
Left Right
Bottom
Models 75 - 125 Models 150 - 400
Models
To p
Bottom
Right
Left
Vent
75 - 125
1"
1"
1"
18"*
2"
Bottom
150 - 400
6"
6"
31"*
6"
2"
RightLeft
* Clearance needed for servicing.
Roberts-Gordon LLC
1250 William Street
P.O. Box 44
Buffalo, NY 14240-0044 USA
Installation Code and Annual Inspections:
All installation 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
facilitate optimum performance and safety, Roberts-Gordon recommends that a qualified contractor conduct annual inspections of your ROBERTS GORDON
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.
This product is not for residential use.
© 2008 Roberts-Gordon LLC www.rg-inc.com Printed in U.S.A. P/N 91039831
Telephone: 716.852.4400
Fax: 716.852.0854
Toll Free: 800.828.7450
®
manuals and all applicable governmental authorities pertaining to the installation, service and operation of the equipment. To help
®
equipment and perform service
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