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UHA-Series
Tubular Unit Heaters
(Low Profile Range)
Installation, Operation
& Service Manual
Models UHA[X][S]
30, 45, 60, 75, 100, 125
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.
Roberts-Gordon LLC
1250 William Street
P.O. Box 44
Buffalo, New York 14240-0044
Telephone: 716.852.4400
Fax: 716.852.0854
Toll Free: 800.828.7450
www.rg-inc.com
Quality in Any Language™
P/N 111100NA 11/08 Rev D
© 2008 Roberts-Gordon LLC
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Table of Contents
Troubleshooting
Related Manuals for Roberts Gorden Combat UHA[X][S] 100
Summary of Contents for Roberts Gorden Combat UHA[X][S] 100
- Page 1 UHA-Series Tubular Unit Heaters (Low Profile Range) Installation, Operation & Service Manual Models UHA[X][S] 30, 45, 60, 75, 100, 125 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.
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Page 3: Table Of Contents
TABLE OF CONTENTS SECTION 1: Heater Safety... 1 1.1 Manpower Requirements ... 1 1.2 Safety Labels and Their Placement ... 1 SECTION 2: Installer Responsibility ... 5 2.1 Wall Tag ... 5 2.2 Corrosive Chemicals... 5 2.3 National Standards and Applicable Codes ... 5 SECTION 3: Critical Considerations ... - Page 5 TABLE OF FIGURES Figure 1: UHA 30 - 45 Label Placement ... 2 Figure 2: UHA 60 - 75 Label Placement ... 3 Figure 3: UHA 100 - 125 Label Placement... 4 Figure 4: Installation Clearances and Clearances to Combustibles ... 7 Figure 5: Suspension Methods ...
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Page 7: Section 1: Heater Safety
SECTION 1: HEATER SAFETY Your Safety is Important to Us! This symbol is used throughout the manual to notify you of possible fire, electrical or burn hazards. Please pay special attention when reading and following the warnings in these sections. Installation, service and annual inspection of heater must be done by a contractor qualified in the installation and service of gas-fired... -
Page 8: Figure 1: Uha 30 - 45 Label Placement
UHA L ROFILE EATER NSTALLATION Figure 1: UHA 30 - 45 Label Placement Description Part Number Logo Label 91040030 Cut Hazard Label 91010430 Vent Length Label 91039505 Vent to Outdoors Label 91010427 Warning Label 91010429 Rating Plate Label 91010420 Installation Label 91010431 Instruction Location Label 91010433... -
Page 9: Figure 2: Uha 60 - 75 Label Placement
Figure 2: UHA 60 - 75 Label Placement Description Part Number Logo Label 91040030 Cut Hazard Label 91010430 Vent Length Label 91039505 Vent to Outdoors Label 91010427 Warning Label 91010429 Rating Plate Label 91010420 Installation Label 91010431 Instruction Location Label 91010433 Lighting Instruction Label 91010425... -
Page 10: Figure 3: Uha 100 - 125 Label Placement
UHA L ROFILE EATER NSTALLATION Figure 3: UHA 100 - 125 Label Placement Description Part Number Logo Label Cut Hazard Label Vent Length Label Vent to Outdoors Label Warning Label Rating Plate Label Installation Label Instruction Location Label Lighting Instruction Label Venting Arrangement Label* * For separated combustion units only PERATION AND... -
Page 11: Section 2: Installer Responsibility
SECTION 2: INSTALLER RESPONSIBILITY The installer is responsible for the following: • To install the heater, as well as the gas and electrical supplies, in accordance with applicable specifications and codes. Roberts-Gordon recommends the installer contact a Local Building Inspector or Fire Marshal for guidance. •... -
Page 12: Section 3: Critical Considerations
UHA L ROFILE EATER NSTALLATION SECTION 3: CRITICAL CONSIDERATIONS 3.1 Basic Information UHA[X][S] heaters have automatic ignition burners for ON/OFF operation only. 3.2 Manufactured Units Gas-fired, power-vented unit heater with tubular heat exchanger. Units shall have a minimum of 82% thermal efficiency. -
Page 13: Gas Supply
3.7 Gas Supply WARNING Fire Hazard Connect gas supply according to Figure 15. 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. -
Page 14: Section 4: National Standards And Applicable Codes
UHA L ROFILE EATER NSTALLATION 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. -
Page 15: High Altitude
SECTION 4: N ATIONAL TANDARDS AND PPLICABLE ODES 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 de-rating. -
Page 16: Section 5: Major Components
UHA L ROFILE EATER NSTALLATION SECTION 5: MAJOR COMPONENTS 5.1 General Heaters are designed for installation above 6' (1.8 m). These heaters must be installed within the heated space. Duct delivery systems are not permitted with axial fan units. When handling or supporting the heater from below, ensure that the weight is taken at the support points. -
Page 17: Figure 5: Suspension Methods
Figure 5: Suspension Methods Unistrut Channel Washer Threaded 3/8" Threaded Washer Figure 6: Shelf-Mounting Methods Existing cabinet screws must be re-used. Ensure all suspension hardware is torqued to a minimum of 20 ft lbs. 3/8" Support Points Description Shelf Mounting Bracket Kit Shelf Mounting Bracket Screw #10 x 1/2"... -
Page 18: Figure 7: Wall Shelf Mounting And Hanging Suspension
UHA L ROFILE EATER NSTALLATION Figure 7: Wall Shelf Mounting and Hanging Suspension Description Wall Shelf Mounting Bracket Kit Wall Suspension Mounting Bracket Kit Shelf Mounting Bracket Kit Hardware provided to construct mounting bracket assembly only. PERATION AND ERVICE ANUAL Description Part Number Qty. -
Page 19: Figure 8: Vertical Louvers (Optional)
Figure 8: Vertical Louvers (Optional) Remove horizontal louvers. Push in louver and compress spring to remove (opposite end first) Description Part Number Vertical Louver Kit UHA[X][S] 30 & 12011003K UHA[X][S] 45 Vertical Louver Bracket #10 Screw UHA[X][S] 30 - 45 Vertical Louvers Louver Spring Instruction Sheet Description... -
Page 20: Section 6: Venting
UHA L ROFILE EATER NSTALLATION 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. -
Page 21: Unvented Operation
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 17 , Figure 9 through Page 20, Figure 14. 6.3.1 Standard Vented Heaters (Models UHA[X] 30 - 125) The vent must be fitted with a low resistance terminal. -
Page 22: Vertical Venting
UHA L ROFILE EATER NSTALLATION • In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall have a period of thirty (30) days to comply with the above requirements;... -
Page 23: Figure 9: Vent And Roof Detail
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. -
Page 24: Figure 11: Standard Vented Heater - Common
UHA L ROFILE EATER NSTALLATION PERATION AND ERVICE ANUAL Figure 11: Standard Vented Heater - Common Vertical Vent Termination... -
Page 25: Figure 12: Separated Combustion Heater - Vertical
Figure 12: Separated Combustion Heater - Vertical and Horizontal Vent Termination 12" (31 cm) Minimum from air inlet to vent termination (may be horizontal or vertical clearance). NOTE: Vent supports not shown. 4" (10 cm) Diameter Air Intake Vertical Option Model Air Intake &... -
Page 26: Figure 14: Concentric Vertical And Horizontal Vent Termination - Separated Combustion Heater
UHA L ROFILE EATER NSTALLATION Figure 14: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater 4" (10 cm) Type B-1 Vent 6" (16 cm) Diameter Single Wall Concentric Vent Box 4" (10 cm) Diameter Air Intake Vertical Option 10' (3 m) Maximum Description... -
Page 27: Section 7: Air Supply
SECTION 7: A UPPLY SECTION 7: AIR SUPPLY 7.1 Separated Combustion Installation When installed as a separated combustion heater (UHA[X]S), the air for combustion is drawn in from outside the building. It is important to ensure that there is adequate space around heater to provide air for the axial air distribution fan. -
Page 28: Section 8: Gas Piping
UHA L ROFILE EATER NSTALLATION SECTION 8: GAS PIPING WARNING Fire Hazard Connect gas supply according to Figure 15. 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. -
Page 29: Section 9: Wiring
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. -
Page 30: Multiple Heater Wiring 30 - 45
UHA L ROFILE EATER NSTALLATION PERATION AND ERVICE ANUAL 9.3 Low Voltage Thermostat with Multiple Heaters 30 - 45 Model Relay Type Relay Part Number Max. Number of Heaters UHA[X][S] 30 - 45 SPST 90417600... -
Page 31: Multiple Heater Wiring 60 - 125
SECTION 9: W IRING 9.4 Low Voltage Thermostat with Multiple Heaters 60 - 125 Model Relay Type Relay Part Number Max. Number of Heaters UHA[X][S] 60 - 125 DPST 90436300... -
Page 32: Internal Wiring Diagram
UHA L ROFILE EATER NSTALLATION 9.5 Internal Wiring Diagram AXIAL FAN (UHA 300, AXIAL FAN 350, 400) ONLY) White G ee Black FLUE BLOWER White G ee Bl e PRESSURE SWITCH Bl e O a ge LIMIT WITCH (UHA O a ge 300,350, 400 ONLY) LIMIT... -
Page 33: Ladder Wiring Diagram
9.6 Ladder Wiring Diagram FLAME SENSOR Flame ELECTRODE pa k 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°... -
Page 34: Electrical Connection To The Heater
UHA L ROFILE EATER NSTALLATION PERATION AND ERVICE ANUAL 9.7 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. -
Page 35: Section 10: Operation And Maintenance
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. -
Page 36: Figure 16: Automatic Burner Control Sequence
UHA L ROFILE EATER NSTALLATION Figure 16: Automatic Burner Control Sequence Burner Sequence for Ignition Control START Thermostat 24 V Flue Blower 30 Seconds Purge* Pressure Switch Ignition Spark Start Gas Valve Flame Signal Axial Fan *Purge time begins at pressure switch change over. Required Incoming Signals Signals Output By Control Figure 17: Gas Valve for Models UHA[X][S] 30 - 45... -
Page 37: Figure 18: Gas Valve For Models Uha[X][S] 60 - 125
Figure 18: Gas Valve for Models UHA[X][S] 60 - 125 END VIEW Gas Inlet 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. -
Page 38: Complete Start-Up
UHA L ROFILE EATER NSTALLATION PERATION AND ERVICE ANUAL Heat exchanger could be damaged. Warranty will not cover damage to the heat exchanger if operated improperly. Only use the disconnect switch for turning off heater for service or during off-season. 10.2.5 External Controls External controls may include time switch, interlock switch, room thermostat and frost thermostat. -
Page 39: Section 11: User Instructions
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. -
Page 40: Simple Troubleshooting
UHA L ROFILE EATER NSTALLATION 2. The automatic firing sequence will begin as described on Page 30, Figure 16. The heater will now operate automatically under the control of the on site controls. 11.4.2 To Turn the Heater Off Set the thermostat to the "OFF" position. The burner will turn off immediately. -
Page 41: Section 12: Servicing
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. -
Page 42: Venting And Air Intake Pipe
UHA L ROFILE EATER NSTALLATION 12.7 Venting and Air Intake Pipe Inspect all venting and air intake pipe. Ensure that all seams are sealed and suspension points secure. Repair suspension points if any part of the venting or combustion air pipe is sagging. Check to make sure any insulation is not missing or in poor condition. - Page 43 Combustion Air Intake Intake pipe and inlet must be intact. Look for obstructions, cracks on the pipe, 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.
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Page 44: Section 13: Troubleshooting
UHA L ROFILE EATER NSTALLATION SECTION 13: TROUBLESHOOTING 13.1 General START Are gas & electrical supplies on? UHA 30 - 75: Press in reset button on manual reset limit switch. UHA 100 - 125: Wait Is ignition control showing a 10 - 15 minutes for limit "4 flashes"... -
Page 45: Troubleshooting For Automatic Ignition Burner Systems
SECTION 13: T ROUBLESHOOTING 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 29, Section 10. -
Page 46: Troubleshooting For Flame Supervision System
UHA L ROFILE EATER NSTALLATION 13.3 Troubleshooting for Flame Supervision System To measure flame current, connect a 0 - 50 μA DC meter in series with the flame probe. If the meter reads negative values, then reverse the test leads. START Connect a DC ammeter in series with the flame probe. -
Page 47: Troubleshooting For Gas Valves
13.4 Troubleshooting for Gas Valves Is gas pressure at inlet of the valve correct for gas type? Does gas pressure at outlet outlet of valve return to zero or lower when valve turns off? TROUBLESHOOT ENDS. 13.5 Troubleshooting for Flue Blower START Does flue blower run automatically when there... -
Page 48: Section 14: Replacement Parts
UHA L ROFILE EATER NSTALLATION SECTION 14: REPLACEMENT PARTS 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. -
Page 49: Burner Compartment
14.2 Burner Compartment 14.2.1 Burner Injectors Inshot Burners Orifices Manifold Mounting Bracket Grommet MODEL UHA[X][S] 30 Orifice Quantity Natural Gas (G20) Orifice Marking 91930049 Propane (G31) Orifice Marking 91930056 Burner Compartment Cover Viewing port for flame probe Flame Probe Ignition Electrode Remove flexible air duct from spigot NOTE: Separated combustion... -
Page 50: Ignition Electrode And Flame Probe
UHA L ROFILE EATER NSTALLATION 14.3 Ignition Electrode and Flame Probe Manual Reset Limit Switch (Position may vary.) Flame Probe Limit Switch Ignition Electrode 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. -
Page 51: Heat Exchanger
14.4 Heat Exchanger The heat exchanger consists of a four-pass design with 1.5" outer diameter [aluminized steel][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 Louver and Louver Springs Horizontal Louvers... -
Page 52: Flue Blower Vertical Installation
UHA L ROFILE EATER NSTALLATION 14.6 Flue Blower Vertical Installation Air Intake Adaptor Air Intake Adapter Intake & Exhaust Covers Gasket NOTE: Seperated combustion model shown. MODEL Flue Blower P/N IT IS IMPORTANT THAT ONLY THE CORRECT FLUE BLOWER SPECIFIED FOR EACH MODEL TYPE IS USED WHEN REPLACING THESE ITEMS. -
Page 53: Pressure Switch
14.7 Pressure Switch Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of pressure switch for model. The pressure switches are color coded for each pressure setting. Carry out a start-up after working on or changing a pressure switch. See Page 29, Section 10. MODEL UHA[X][S] 30 Pressure Switch... -
Page 54: Limit Switches
UHA L ROFILE EATER NSTALLATION 14.9.1 Fan Removal and Replacement Description Axial Fan UHA[X][S] 30 Axial Fan UHA[X][S] 45 Axial Fan UHA[X][S] 60 Axial Fan UHA[X][S] 75 Axial Fan UHA[X][S] 100 and UHA[X][S] 14.9.2 To Replace the Fan Assembly To replace the fan assembly, reverse the procedure shown above. -
Page 55: Section 15: Specifications
SECTION 15: SPECIFICATIONS 15.1 Dimension Data MODEL 'A' Height (cm) 'C' Center of Flue [Top Option] (cm) 'D' Center of Flue (cm) Recommended Mounting Height to Heater Base TOP VIEW 17.63" (45 cm) 18.25" 16.63" (46 cm) (42 cm) REAR VIEW 28.5"... -
Page 56: General Technical Data Table (All Models)
UHA L ROFILE EATER NSTALLATION 15.2 General Technical Data Table (All Models) Low Profile UHA[X][S] Axial Fans Full Load Amps @ 115 V Air Volume Flue and Air Intake Flue and Air Intake Size *Maximum Straight Flue/Air Intake *Do not exceed the maximum length of flue stated or heater may not operate properly. 15.3 Technical Data Table (All Models) Model Total Input... -
Page 57: Section 16: Roberts Gordon ® Combat
SECTION 16: ROBERTS GORDON ® ROBERTS GORDON WILL PAY FOR: Within 24 months from date of purchase by buyer or 27 months from the 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. -
Page 59: Uha-Series Warranty
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:__________________________________________________________________________________________________ Add ess:______________________________________City:_________________________ tate:__________Zip Code:________ Pho e:_________________________ Fax:_________________________ E-mail:______________________________________ About the Installer: Name:__________________________________________________________________________________________________ Add ess:______________________________________City:_________________________ tate:_________Zip Code:_________ Pho e:__________________________Fax:_________________________ E-mail:______________________________________ Purchased From (if different than installer):...