How it Works
Roberts Gorden
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UHD-XSR125
User Manual
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Roberts Gorden UHD-XSR125, UHD-XSR75 User Manual

®
Combat
UHD-Series
Tubular Duct Furnace
(Low Profile Range)
Installation, Operation
& Service Manual
Models UHD[X][S][R]
75, 100, 125
Quality in Any Language™
© 2008 Roberts-Gordon LLC
Roberts-Gordon LLC
1250 William Street P. O . B o x 44 Buffalo, New York 14240-0044 Telephone: 716.852.4400 Fax: 716.852.0854 Toll Free: 800.828.7450
www.rg-inc.com
P/N 113000NA 11/08 Orig.
© 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 Shelf Mounting and Suspension..................................8
5.3 Wall Mounting ..............................................................8
SECTION 6: Venting.............................................................. 10
6.1 Changing Vent and Air Intake Orientation.................. 10
6.2 Venting....................................................................... 10
6.3 Vent Installation ......................................................... 10
6.4 Unvented Operation................................................... 11
6.5 Horizontal Venting...................................................... 11
6.6 Vertical Venting.......................................................... 11
6.7 Length Requirements ................................................ 11
6.8 Vent Material.............................................................. 12
6.9 Replacing an Existing Heater in a Venting System.... 12
SECTION 7: Air Supply......................................................... 17
7.1 Separated Combustion Installation............................. 17
7.2 Unvented Installation.................................................. 17
7.3 Building Ventilation..................................................... 17
7.4 Outside Combustion Air Supply.................................. 17
SECTION 8: Gas Piping........................................................18
8.1 Connections............................................................... 18
SECTION 9: Wiring................................................................ 19
9.1 Positioning Thermostats ............................................ 19
9.2 Low Voltage Thermostat with One Heater ................. 19
9.3 Internal Wiring Diagram .............................................20
9.4 Ladder Wiring Diagram.............................................. 21
9.5 Electrical Connection to the Heater ........................... 22
SECTION 10: Operation and Maintenance..........................23
10.1 Pre-Start-Up Checks ................................................23
10.2 Begin Start-Up .........................................................23
10.3 Complete Start-Up ...................................................25
SECTION 11: User Instructions............................................26
11.1 User Instructions.......................................................26
11.2 Heater Operation ......................................................26
11.3 Common User Controls.............................................26
11.4 Lighting Instructions..................................................26
11.5 Simple Troubleshooting.............................................27
SECTION 12: Servicing.........................................................28
12.1 Servicing Instructions...............................................28
12.2 Burner Maintenance.................................................28
12.3 Heat Exchanger Maintenance ..................................28
12.4 Gas Valve Maintenance ...........................................28
12.5 Flue Blower ..............................................................28
12.6 Venting and Air Intake Pipe......................................28
12.7 Maintenance Checklist.............................................29
SECTION 13: Troubleshooting .............................................31
13.1 General ....................................................................31
13.2 Troubleshooting For Automatic Ignition Burner
Systems ...................................................................32
13.3 Troubleshooting for Flame Supervision System .......33
13.4 Troubleshooting for Gas Valves................................34
13.5 Troubleshooting for Flue Blower...............................34
SECTION 14: Replacement Parts.........................................35
14.1 Gas Valve .................................................................35
14.2 Burner Compartment ...............................................36
14.3 Ignition Electrode and Flame Probe .........................37
14.4 Heat Exchanger .......................................................37
14.5 Flue Blower Vertical Installation ...............................38
14.6 Pressure Switch........................................................39
14.7 Ignition Control .........................................................39
14.8 Limit Switches ..........................................................39
SECTION 15: Specifications.................................................40
15.1 Dimension Data........................................................40
15.2 General Technical Data Table ..................................41
15.3 Technical Data Table ................................................41
SECTION 16: ROBERTS GORDON
Warranty..........................................................43
®
COMBAT® UHD-Series
Printed in U.S.A.
TABLE OF FIGURES
Figure 1: Clearances to Combustibles ...................................... 3
Figure 2: Air Flow Direction....................................................... 7
Figure 3: Suspension Methods ................................................. 8
Figure 4: Shelf-Mounting Methods............................................9
Figure 5: Wall Shelf Mounting and Suspension ........................9
Figure 6: Vent and Roof Detail ................................................ 13
Figure 7: Standard Vented Heater - Vertical and Horizontal
Vent Termination...................................................... 13
Figure 8: Standard Vented Heater - Common Vertical Vent
Termination .............................................................. 14
Figure 9: Separated Combustion Heater - Vertical and
Horizontal Vent Termination..................................... 15
Figure 10: Concentric Vent Box...............................................15
Figure 11: Concentric Vertical and Horizontal Vent Termination -
Separated Combustion Heater...............................16
Figure 12: Gas Connection ..................................................... 18
Figure 13: Automatic Burner Control Sequence...................... 24
Figure 14: Gas Valve .............................................................. 24
Figure 15: Manual Reset Limit Switch.....................................26
Figure 16: LED Diagnostic Codes ...........................................27
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 installations. 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.
SECTION 1: HEATER SAFETY
Before installation, check 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
UHD LOW PROFILE 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
SECTION 3: CRITICAL CONSIDERATIONS
Clearance to Vent: 2" (5 cm)
*18" (46 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
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.
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 using shelf mounting brackets.(See Page 9, Figure 4 and Page 9, Figure 5 for details.)
• 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 40, 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 13, Figure 6 through Page 16, Figure 11 to ensure access for servicing, and correct operation.
3
UHD LOW PROFILE 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. See Page 10, 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 19, Section 9.
3.7 Gas Supply
WARNING
Fire Hazard
Connect gas supply according to Figure 12.
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 18, 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 10, Section 6.
4
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.
5
UHD LOW PROFILE 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
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 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 degrees. 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
range shown on Page 7, Section 5.1.3. The minimum inlet duct lengths shown on Page 7, Section 5.1.1 should be observed. Pressure drop through the heat exchanger at various air flows is given on Page 7, Section 5.1.2.
Figure 2: Air Flow Direction
OUTLET DUCT
AIR FLOW
INLET DUCT
5.1.1 Minimum Inlet Duct Length
Model Duct Length Duct Size (W X H)
UHD[X][S][R] 75 32" (81 cm) 16 1/8" x 15 7/8" (41 cm x 40 cm) UHD[X][S][R] 100 &125 37" (94 cm) 21 3/4" x 15 7/8" (55 cm x 40 cm)
5.1.2 Temperature Rise and Pressure Drop Ranges
UHD[X][S][R] 75 UHD[X][S][R] 100 UHD[X][S][R] 125
Airflow
(CFM)
850 68.0 0.06 950 78 0.05 1,020 92 0.06 1,200 48.3 0.10 1,500 50 0.18 1,650 57 0.14 1,625 36.4 0.16 2,500 31 0.28 2,340 41 0.27 1,965 30.3 0.22 3,000 26 0.39 3,480 28 0.56 2,450 24.4 0.31 3,300 24 0.46 4,240 23 0.80 2,650 22.0 0.36 3,660 22 0.55 4,750 20 0.98
Temperature
Rise (°F)
Pressure Drop
(in wc)
Airflow
(CFM)
Temperature
Rise (°F)
Pressure Drop
(in wc)
Airflow
(CFM)
Temperature
Rise (°F)
Pressure Drop
(in wc)
5.1.3 Air Flow and Temperature Rise Ranges
Model Rate Air Flow Temperature Rise
UHD[X][S][R] 75 75,000 850 2,650 22 68 UHD[X][S][R] 100 100,000 950 3,660 22 78 UHD[X][S][R] 125 125,000 1,020 4,750 20 92
(Btu/h) Minimum (CFM) Maximum (CFM) Minimum (°F) Maximum (°F)
7
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
WARNING
Crush Hazard
Use 3/8" threaded rod minimum.
Failure to follow these instructions can result in death, injury or property damage.
NOTE: Duct supports
not shown. Duct supports and duct are not provided by manufacturer.
Support Points
Ensure all suspension hardware is torqued to a minimum of 20 ft lbs.
Washer
3/8"
Threaded
Rod
Nut
Unistrut
Channel
Nut
Cone Point
Set Pin
Window
Clamp
Unistrut
3/8"
Threaded
Rod
Nut
Washer
Riv Nut
5.2 Shelf Mounting and Suspension
Four suspension points (3/8" nuts) are located on the top of the heater. Drop rods must be 3/8" diameter mild steel.
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. For typical shelf mounting on existing shelf, See Page 9, Figure 4.
The gas or electrical supply lines must not be used to support the heater.
Do not locate the gas or electrical supply lines directly over the path of the flue products from the heater.
The heater must be installed in a location that is readily accessible for servicing.
The heater must be installed in accordance with clearances to combustibles as indicated on the wall tag and in this manual.
5.3 Wall Mounting
For typical suspension, See Page 9, Figure 5. Wall mounted heaters blowing parallel to the wall can only be installed with the service door away from the wall.
The wall mounting brackets must be attached to a suitable wall using all mounting holes. Screw sizes less than 3/8" may not be used. In order for the wall mounting brackets to adequately carry the weight of the heater, it must be installed according to best building practices.
Figure 3: Suspension Methods
8
Figure 4: Shelf-Mounting Methods
Shelf Mounting
Brackets
Description Part Number Qty. Shelf Mounting Bracket Kit 12011000K
Shelf Mounting Bracket 11111510 2 Screw #10 x 1/2" Type AB Phil HWH Z
94311008 2
Existing cabinet screws must be re-used.
Shelf Mounting Brackets (Fasten to Wall Mounting Bracket)
5/16" x 3 1/2" Bolt 5/16" Flat Washer 5/16" Locknut with Nylon Insert Tor que to 40 in lb (4.5 Nm).
Wall Shelf Mounting
Wall Mounting
Bracket Arm (Right & Left)
Wall Suspension Mounting
Wall Mounting Bracket Vertical
Wall Mounting
Bracket Diagonal
3/8" Fasteners
Description Part Number Qty. Wall Shelf Mounting Bracket Kit 12011002K
Wall Suspension Mounting Bracket Kit 12011001K 1 Shelf Mounting Bracket Kit 12011000K 1
Description Part Number Qty. Wall Suspension Mounting Bracket Kit 12011001K
Wall Mounting Bracket Arm Left 111WALL1 1 Wall Mounting Bracket Arm Right 111WALL1 1 Wall Mounting Bracket Vertical 111WALL2 2 Wall Mounting Bracket Diagonal 111WALL3 2 5/16" x 3 1/2" Bolt 97213925 6 5/16" Lock Nut with Nylon Insert 92114000 6 5/16" Flat Washer 95211600 6 5/16" Lockwasher 96411600 6
Hardware provided to construct mounting bracket assembly only.
Figure 5: Wall Shelf Mounting and Suspension
SECTION 5: DUCT HEATER INSTALLATION
9
UHD LOW PROFILE 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.
SECTION 6: VENTING
6.1 Changing Vent and Air Intake Orientation
The heater is sold with rear horizontal vent and air intake connections as standard. (Only separated combustion models have air intake connection). If vertical vent and air intake connections are required, follow the instructions on Page 38, Section 14.5.
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 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 NFPA54/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 11, 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"
10
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, Figure
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 13, Figure 6 through Page 16, Figure 11. 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.
SECTION 6: VENTING
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 13, Figure 6 through Page 16, Figure 11.
6.3.1 Standard Vented Heaters (Models UHD[X][R] 75 - 125)
The vent must be fitted with a low resistance terminal. See Page 13, Figure 6 through Page 13, Figure 7. Standard vented heaters do not allow outdoor air intake for combustion air.
6.3.2 Separated Combustion Heaters (Models UHD[X]S[R] 75 - 125)
The heaters are designed to be installed as separated combustion heaters. The vent and air intake are run as separate pipes to the wall or roof terminals. See Page 15, Figure 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 15, Figure 10 and See Page 16, Figure 11.
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 10, Section 6.
6.4 Unvented Operation
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.
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
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. Venting through the top of the heater cabinet is not recommended if vent lengths are longer than 10' (3 m). In this case, 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 14, Figure 8.
A vent shall not extend less than 2' (.6m) above the highest point where it passes through a flat roof of a building.
6.7 Length Requirements
If using vent lengths greater than 5' (1.5 m), condensation will form in the vent pipe. Insulation
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