Blackheat ™ UHA-Series Tubular Unit Heaters (Low Profile Range) Installation, Operation & Service Manual Models UHA[X][S] 30, 45, 60, 75, 100, 125 WARNING 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.
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.
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 ............................................... 11 Figure 6: Shelf-Mounting Methods ..............................
SECTION 1: HEATER SAFETY SECTION 1: HEATER SAFETY Your Safety is Important to Us! This symbol is used throughout the manual to notify you of possible fire, electrical or burn hazards. Please pay special attention when reading and following the warnings in these sections. Installation, service and annual inspection of heater must be done by a contractor qualified in the installation and service of gas-fired heating equipment.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 1: UHA 30 - 45 Label Placement Description 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* Manual Reset Switch Label Part Number 91033203 91010430 91039505 91010427 91010429 91010420 91010431 91010433 91010425 91010426 91010428 * For separated combustion units only 2
SECTION 1: HEATER SAFETY Figure 2: UHA 60 - 75 Label Placement Description 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* Manual Reset Switch Label Part Number 91033203 91010430 91039505 91010427 91010429 91010420 91010431 91010433 91010425 91010426 91010428 * For separated combustion units only 3
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 3: UHA 100 - 125 Label Placement VENT TO OUTDOORS DONNER VENT A DEHORS Printed in U.S.A.
SECTION 1: HEATER SAFETY SECTION 2: INSTALLER RESPONSIBILITY The installer is responsible for the following: • To install the heater, as well as the gas and electrical supplies, in accordance with applicable specifications and codes. Roberts-Gordon recommends the installer contact a Local Building Inspector or Fire Marshal for guidance. • To use the information given in a layout drawing and in the manual together with the cited codes and regulations to perform the installation.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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. The standard unit shall consist of a non-separated combustion design with an aluminized heat exchanger.
SECTION 3: CRITICAL CONSIDERATIONS 3.7 Gas Supply 3.8 Electrical Supply WARNING WARNING Electrical Shock Hazard Fire Hazard Connect gas supply according to Figure 15. Disconnect electrical and gas supply before servicing. Do not use gas supply pipe and electrical connections to support heater’s weight. This appliance must be connected to a properly grounded electrical source. Gas can leak if not installed properly. Failure to follow these instructions can result in death or electrical shock.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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 Natual Gas and Propane Installation Code. 4.
SECTION 4: NATIONAL STANDARDS AND APPLICABLE CODES 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 derated. For installations above 2000' (610 m) in US, consult factory for information on burner de-rating. For installations from 2000' (610 m) to 4500' (1370m) in Canada, high altitude conversion kits are available.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 5: MAJOR COMPONENTS 5.1 General Heaters are designed for installation above 6' (1.8 m). These heaters must be installed within the heated space. Duct delivery systems are not permitted with axial fan units. When handling or supporting the heater from below, ensure that the weight is taken at the support points. The gas or electrical supply lines must not be used to support the heater.
SECTION 5: MAJOR COMPONENTS Figure 5: Suspension Methods Unistrut Channel Nut Ensure all suspension hardware is torqued to a minimum of 20 ft lbs. Washer Nut 3/8" Threaded Rod Cone Point Set Pin Window Clamp 3/8" Threaded Rod Unistrut Nut Washer Riv Nut Support Points Figure 6: Shelf-Mounting Methods Shelf Mounting Brackets Description Part Number Shelf Mounting Bracket Kit 12011000K Shelf Mounting Bracket 11111510 Screw #10 x 1/2" 94311008 Type AB Phil HWH Z Qty.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 7: Wall Shelf Mounting and Hanging Suspension Description Wall Shelf Mounting Bracket Kit Wall Suspension Mounting Bracket Kit Shelf Mounting Bracket Kit Part Number 12011002K 12011001K 12011000K Qty.
SECTION 5: MAJOR COMPONENTS Figure 8: Vertical Louvers (Optional) Remove horizontal louvers. Install vertical louvers brackets (top and bottom) with supplied screws. Install vertical louvers and springs into brackets with springs at top.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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. 6.
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 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. See Page 17, Figure 9 through Page 17, Figure 10. Standard vented heaters do not allow outdoor air intake for combustion air. 6.3.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL • 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; provided, however, that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be installed.
SECTION 6: VENTING must be in accordance with the appropriate are located and other spaces of the building. local codes and the NFPA 54/ANSI Z223.1 Turn on clothes dryers and any exhaust fans, latest revision, National Fuel Gas Code (US) or such as range hoods and bathroom exhausts Standard CSA B149.1 Natural Gas and so that they shall operate at maximum speed. Propane Installation Code (Canada). Do not operate a summer exhaust fan. Close fireplace dampers. Figure 9: Vent and Roof Detail 4.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 11: Standard Vented Heater - Common Vertical Vent Termination 18
SECTION 6: VENTING 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). 12" (31 cm) Minimum from wall to vent termination. NOTE: Vent supports not shown. 4" (10 cm) Diameter Vent 4" (10 cm) Diameter Air Intake Listed Thimble through Combustible Wall 4" (10 cm) Diameter Vent Vertical Option 12" (31 cm) Minimum from wall to vent termination.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 14: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater NOTE: Vent supports not shown. Vent Terminal with Baffle Plate 4" (10 cm) Type B-1 Vent Storm Collar (By Others) (Attach with 3 sheet metal screws.
SECTION 7: AIR SUPPLY 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. 7.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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. A gas meter is connected to the service pipe by the gas supply company.
SECTION 9: WIRING SECTION 9: WIRING codes in accordance with: United States: refer to National Electrical Code® NFPA 70 - latest revision; Canada: refer to Canadian Electrical Code CSA C22.1 Part I - latest revision. 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.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 9.3 Low Voltage Thermostat with Multiple Heaters 30 - 45 Model UHA[X][S] 30 - 45 24 Relay Type SPST Relay Part Number 90417600 Max.
SECTION 9: WIRING 9.4 Low Voltage Thermostat with Multiple Heaters 60 - 125 Model UHA[X][S] 60 - 125 Relay Type DPST Relay Part Number 90436300 Max.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 9.
SECTION 9: WIRING 9.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 9.7 Electrical Connection to the Heater Flexible Conduit BX Connector Burner Connect wires together with suitable approved wire connectors. L1 L2 Ground Green to Ground White to L2 Black to L1 Black White Green Junction Box IMPORTANT: Junction box is not provided with heater. Conduit can also be attached directly to heater with wire junction made within the heater cabinet.
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. Failure to follow these instructions can result in death, injury or property damage.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 16: Automatic Burner Control Sequence Burner Sequence for Ignition Control START RUN SHUT DOWN Thermostat 24 V Flue Blower Pressure Switch 30 Seconds Purge* P C 30 Seconds Post Purge NO NC ts = 10 Seconds Ignition Spark Start Gas Valve Flame Signal 30 Seconds Delay 90 Seconds Delay Axial Fan *Purge time begins at pressure switch change over.
SECTION 10: OPERATION AND MAINTENANCE Figure 18: Gas Valve for Models UHA[X][S] 60 - 125 END VIEW TOP VIEW Regulator ½PSI C IN ON OFF Gas Inlet Inlet Pressure 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.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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. Operate each control to ensure that they function correctly.
SECTION 11: USER INSTRUCTIONS SECTION 11: USER INSTRUCTIONS WARNING 11.3 Common User Controls 11.3.1 Manual Reset Limit Switch WARNING Explosion Hazard 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. Do not make more than one attempt to restart the heater if manual reset limit switch locks out.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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. The fan will continue to run for 90 seconds. To restart, turn the thermostat above room temperature. 11.
SECTION 12: SERVICING SECTION 12: SERVICING WARNING 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 Fan/Motor Assembly 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.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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. Replace as required. Check all venting and air intake components to ensure they are in good condition, gas tight and corrosion-free. 12.
SECTION 12: SERVICING 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 22, Section 8. Gas Line and Shut-off Valves Burner Observation Window Check for gas leaks. See Page 22, Section 8.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 13: TROUBLESHOOTING 13.1 General WARNING START Are gas & electrical supplies on? No Turn on supplies. 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.
SECTION 13: TROUBLESHOOTING 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.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 13.3 Troubleshooting for Flame Supervision System To measure flame current, connect a 0 - 50 μA DC meter in series with the flame probe. If the meter reads negative values, then reverse the test leads. START Connect a DC ammeter in series with the flame probe. Is the flame present and at least 1 μA DC flame current? No Use General Troubleshooting section to trace the fault.
SECTION 13: TROUBLESHOOTING 13.4 Troubleshooting for Gas Valves START Is gas pressure at inlet of the valve correct for gas type? Note pressure found. No Fault elsewhere. Correct pressure problem. No Valve or ignition control faulty. Replace with one of correct type. No Valve faulty. Replace with one of correct type. No If problems persist, contact Roberts-Gordon LLC at www.rg-inc.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.1 Gas Valve Remove the gas supply pipe at the heater inlet. Follow steps in Section 14.2 and 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 31, Section 10.2.2.
SECTION 14: REPLACEMENT PARTS 14.2 Burner Compartment The burner compartment is a sealed compartment. Following any work, re-seal the compartment with the gas pipe rubber seal fully in place and all screws fitted and tight. Burner Compartment Cover Viewing port for flame probe Flame Probe Ignition Electrode Remove flexible air duct from spigot . NOTE: Separated combustion model shown. Remove screws and pull off burner cover 14.2.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.3 Ignition Electrode and Flame Probe Inshot Burners Manual Reset Limit Switch (Position may vary.) Flame Probe Flame Probe Limit Switch Burner Compartment Front Views Ignition Electrode Ignition Electrode .120 (3 mm) spark gap Inshot Burners To replace the electrode or flame probe, remove the electrical lead and screw. Pull out from mounting.
SECTION 14: REPLACEMENT PARTS 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.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.6 Flue Blower Vertical Installation To remove the blower, remove screws securing the fan and mounting plate to the vent box. Intake & Exhaust Covers Mounting Plate to Vent Box fixing screws Air Intake Adaptor Gaskets Vent Box Mounting Plate to Flue Blower screws Intake & Exhaust Covers Air Intake Adapter Rotate the blower, mounting plate and gasket clockwise until the flue adapter lines up with the top hole. Secure screws.
SECTION 14: REPLACEMENT PARTS 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. .
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.9.1 Fan Removal and Replacement Remove the mounting hardware. Remove the screws and washers. 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] 125 Part Number 12011910 12011911 12011920 12011921 Quantity 1 1 1 1 12011922 1 14.9.2 To Replace the Fan Assembly To replace the fan assembly, reverse the procedure shown above.
SECTION 15: SPECIFICATIONS SECTION 15: SPECIFICATIONS 15.1 Dimension Data MODEL UHA[X][S] 30 UHA[X][S] 45 UHA[X][S] 60 UHA[X][S] 75 UHA[X][S] 100 UHA[X][S] 125 'A' Height in (cm) 12 (30.48) 12 (30.48) 17.75 (45.09) 17.75 (45.09) 23 (58.42) 23 (58.42) 'C' Center of Flue [Top Option] in (cm) 5.2 (13.21) 5.2 (13.21) 5.2 (13.21) 5.2 (13.21) 6.9 (17.53) 6.9 (17.53) 'D' Center of Flue in (cm) 2.5 (6.35) 2.5 (6.35) 2.5 (6.35) 2.5 (6.35) 2.5 (6.35) 2.5 (6.
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 15.2 General Technical Data Table (All Models) Model UHA[X][S] 30 UHA[X][S]4 UHA[X][S] UHA[X][S] 5 60 75 A 3.0 3.0 4.1 CFM 691 691 1376 UHA[X][S] 100 UHA[X][S] 125 4.1 5.8 5.8 1376 1902 1902 40 (12.2) 40 (12.2) Low Profile UHA[X][S] Axial Fans Full Load Amps @ 115 V Air Volume Flue and Air Intake Flue and Air Intake Size in (cm) *Maximum Straight Flue/Air Intake 4 (10) - All Models ft (m) 25 (7.6) 25 (7.
SECTION 16: ROBERTS GORDON® BLACKHEAT™ UHA-SERIES WARRANTY SECTION 16: ROBERTS GORDON® BLACKHEAT™ UHA-SERIES WARRANTY The ownership of the 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.
® Wa r m Air Heating OWNER WARRANTY REGISTRATION CARD Mail or Fax to: Roberts Gordon LLC • 1250 William Street, P.O. Box 44 • Buffalo, NY 14240-0044 • Phone: 716-852-4400 • Fax: 716-852-0854 Toll Free: 800-828-7450 • www.rg-inc.
Attach this information to the wall near the ROBERTS GORDON® heater ® Read the Installation, Operation and Service Manual thoroughly before installation, operation or service. WARNING OPERATING INSTRUCTIONS 1. STOP! Read all safety instructions on this information sheet. 2. Open the manual gas valve in the heater supply line. 3. Turn on electric power to the heater. 4. Set the thermostat to desired setting (above ambient temperature). The automatic starting sequence begins. TO TURN OFF THE HEATER 1.