Roberts Gorden UHA SERIES 150 User's Manual
Contents
1. Top View Heater must be supported at these points from above or below ind E gt lt C gt lt D e Y z o Ao Support 4 x 3 8 Captive Nuts Provided enters 19 3 8 49 i 1 Y m mr End View 1 lt Z k 25 1 2 65 cm gt gt Air Intake UHAS only aa i M rl Lockout Reset Gas Electrical Cable Entry Supply ae 6 1 2 17 Y I lt gt Model UHA S UHA S UHA S UHA S UHA S UHA S UHA S UHA S 150 175 200 225 250 300 350 400 A Width in 42 4 42 4 42 4 42 4 42 4 52 3 52 3 52 3 cm 108 108 108 108 108 133 133 133 B Height in 26 9 26 9 35 2 35 2 35 2 43 5 43 5 43 5 9 cm 68 68 89 89 89 110 110 110 C 8 in 17 7 17 7 17 7 17 7 17 7 24 7 24 7 24 7 45 45 45 45 45 63 63 63 in 12 3 12 3 12 3 12 3 12 3 12 3 12 3 12 3 Support Spacing cm 31 81 81 81 81 31 31 31 E in 12 4 12 4 12 4 12 4 12 4 15 3 15 3 15 3 Support Spacing cm 32 32 32 32 32 39 39 39 F in 15 5 15 5 175 175 175 13 8 13 8 13 8 Danie cm 39 39 44 44 44 35 35 35 G Centre of in 5 5 5 5 6 4 6 4 6 4 7 7 7 Flue Air Intake cm 142. Clearance needed for servicing Roberts Gordon LLC 1250 William Street Telephone 716 852 4400 Box 44 Fax 716 852 0854 Buffalo NY 14240 0044 USA Toll Free 800 828 7450 Installation Code and Annual Inspections All installations and service of ROBERTS GORDON equipment must be performed by a contractor qualified in the installation and service of equipment sold and supplied by Roberts Gordon and conform to all requirements set forth in the ROBERTS GORDON manuals and all applicable governmental authorities pertaining to the installation service and operation of the equipment To help facilitate optimum performance and safety Roberts Gordon recommends that a qualified contractor annually inspect your ROBERTS GORDON equipment and perform service where necessary using only replacement parts sold and supplied by Roberts Gordon For installations at elevations above 2000 610 m the appliance shall be derated 4 for each 1000 305 m of elevation above sea level Further Information Applications engineering and detailed guidance on systems design installation and performance is available through ROBERTS GORDON representatives Please contact us for any further information you may require including the Installation Operation and Service Manual Models 100 400 are not for residential use 2007 Roberts Gordon LLC www rg inc com Printed in U S A P N 91040031 Rev B
3. 6 15 a at Tad 10 EN a 6 PEN 31 Wall PM 8 m 15 cm 79 cm Terminal air fow access S c 20 6 0 m 30 9 1 m bi Max Mounting Height t Recommended mounting height varies with heater input Heaters may be mounted at a higher level if destratification fans are installed Note Venting directly from top of heater not applicable on Models 150 400 Clearance to Vent 2 5 cm 31 79 cm minimum is necessary for servicing The heater must always be installed at least 6 2 m above the floor The vent pipe must have clearance from combustibles by 2 5 cm If installed at low levels where individuals can come in contact with hot heat exchanger components adequate guarding must be provided SECTION 4 NATIONAL STANDARDS AND APPLICABLE CODES SECTION 4 NATIONAL STANDARDS AND APPLICABLE CODES 4 1 Gas Codes 4 3 Parking Structures and Repair Garages The type of gas appearing on the nameplate 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
4. 25 SECTION 13 Troubleshooting eren 27 19 1 General c a 27 13 2 Troubleshooting For Automatic Ignition Burner Systems aca cete rear actinic Ea occu 28 13 3 Troubleshooting for Flame Supervision System 29 13 4 Troubleshooting for Gas Valves 30 13 5 Troubleshooting for Combustion Fan 30 SECTION 14 Replacement 31 14 1 Gas Valve esssssssseseseeeeeneee nennen nnne nns 31 14 2 Burner Compartment sese 32 14 3 Ignition Electrode and Flame Probe 33 14 4 Combustion Fan Vertical Installation 34 14 5 Pressure Switch esses 35 14 6 Ignition Control eene 36 14 7 Axial Fan Guard Motor Assembly 36 14 8 Limit Switches SECTION 15 Specifications 15 1 Standard Models 150 400 UHA S Series Dimension Data 37 15 2 General Technical Data Table All Models 38 15 3 Technical Data Table All Models 38 SECTION 16 The ROBERTS GORDON COMBAT UHA Series 1 39 2007 Roberts Gordon LLC All rights reserved No part of this work covered by the copy
5. Is inlet burner gas pressure correct Is live and neutral polarity correct Is flame probe circuit correct Does lockout occur when there is a flame present Yes Repair or replace as necessary If problems persist contact Roberts Gordon LLC at www rg inc com Heater Operating TROUBLESHOOT ENDS Repair or replace as necessary Replace ignition control SECTION 13 TROUBLESHOOTING NOTE Minimum flame probe current 1 uA DC Typical flame probe current 3 5 pA DC 29 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 13 4 Troubleshooting for Gas Valves START Is gas pressure at inlet of the valve correct for gas type Note pressure found Does gas pressure at outlet of the valve rise when valve turns on Does gas pressure at outlet of valve return to zero or lower when valve turns off Valve Operating TROUBLESHOOT ENDS 13 5 Troubleshooting for Combustion Fan START Does combustion fan run Correct power automatically when there No supply problem is a call for heat Fan motor faulty Replace with correct type Does fan t rn on and off while burner is firing Yes Check fan motor leads for continously loose connections If problems persist contact Roberts Gordon LLC at www rg inc com Fan Operating TROUBLESHOOT ENDS For your safety and optimum heater performance Fault elsewhere Correct pressure problem Valve or igniti
6. Probe i burner compartment Screws to remove 4 the burner Remove compartment and Screw access the Front View Burner Compartment Front Views V A 1 I gnition Electrode Ignition Electrode X To replace the electrode or flame probe remove the electrical lead and screw Pull out from mounting Refit in reverse ensuring that the gap to burner is as shown in the front view of the burner compartment Description Part Number Qty Spark Electrode 90427411 Automatic Ignition Flame Probe 90439300 Inshot Burners 150 175 92000001 Inshot Burners 200 400 92000002 Limit Switch 150 400 90412103 Limit Switch 300 400 90412105 33 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14 4 Combustion Fan Vertical Installation Remove screws securing outlet Rear Panel flange to the flue adapter Flue Adapter to Flue Fan Screws Refit in reverse order Vent Box Eu T Vent B Outlet Adapter Gasket BEES n Fan Disconnect electrical connections at plug in tabs Remove screws securing flue fan mounting plate to vent box Mounting Remove screws securing mounting plate to fan ae Mounti
7. 00 ee 5 4 2 Aircraft Hangars esee 5 4 3 Parking Structures and Repair Garages 5 4 4 Electrical iniecit 5 4 5 Ventlnig eoe tret ed E Ire 5 4 6 High Altitude seem 5 SECTION 5 Major Components 6 5 1 Gehleral actetuer 6 5 2 SUSPENSION Lm 6 SECTION 6 Veritilig edicere terne eic censent 7 6 1 Vernititig eodd reete xen te tee erro 7 6 2 Vent Installation eeeen 7 6 3 Unvented Operation sess 8 6 4 Horizontal Venting ssee 8 6 5 Vertical Venting sn 8 6 6 Length Requirements sse 8 6 7 Vent Material 9 SECTION 7 Air Supply eere 13 7 1 Separated Combustion 13 7 2 Unvented Installation 13 7 3 Building Ventilation eesen 13 7 4 Outside Combustion Air 13 SECTION 8 Gas Piping eese 14 8 1 eee 14 SECTION 9 Wirlhg ritorna ins 15 9 1 Positioning Thermostats 15 9 2 Low Voltage Thermostat with One Heater 15 9 3 UHA S Series Internal Wiring Diagram
8. Electrical 24 Volt Thermostat with Fan Control Supply Terminal Strip Y Le Terminal Strip 15 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 9 3 UHA S Series Internal Wiring Diagram BLOWER PRESSURE SWITCH MANUAL RESET LIMIT SWITCH LIMIT SWITCH UH 30 125 ONLY SENSE F BLACK ELECTRODE BL ACK BLACK NOTE __ 4 5 zu S4 S amp 1 18 O S AT TTS GAS VALVE ME A 24 VAC TO THERMOSTAT RED MANUAL FAN INPUT FROM THERMOSTAT GREEN HEAT DEMAND INPUT FROM THERMOSTAT WHITE COMMON SIDE OF TRANSFORMER THERMOSTAT INPUT FIELD SUPPLIED For field wiring into service junction box or if any of the original wire supplied with the heater must be replaced it must be replaced with wiring material having a temperature rating of at least 105 C and 600 volts For supply connections use No 14 AWG or larger wires 16 SECTION 9 WIRING 9 4 UHA S Series Ladder Wiring Diagram 120 VAC FLAME SENSOR FLAME IGNITION MODULE LIMIT SWITCH LIMIT SWITCH UH 300 350 400 ONLY ELECTRODE 1 MANUAL RESET LIMIT SWITCH 1 UH 30 125 ONLY THERMOSTAT CONNECTION NOTE For field wiring into service junction box or if any of the original wire supplied with the heater must be replaced it must be replaced with wiring material having a temperature rating of at least 105 C and 600 volts
9. 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 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 88 heaters must be located a minimum of 18 BO cm below the floor ceiling assembly or 18 50 cm above the floor In accordance with
10. 14 16 16 16 18 18 18 H T in 8 2 8 2 8 8 8 8 8 8 11 11 11 Peston el cm 21 21 22 22 22 28 28 28 l in 5 8 5 8 5 8 5 8 5 8 5 8 5 8 5 8 Cas cm 15 15 15 15 15 15 15 15 7 Lenath in 34 34 34 34 34 34 34 34 9 cm 86 86 86 86 86 86 86 86 37 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 15 2 General Technical Data Table All Models UHA S UHA S UHA S UHA S UHA S UHA S UHA S UHA S 150 175 200 225 250 300 400 Full Load Amps 115 V A 5 8 5 8 10 6 10 6 10 6 11 6 11 6 Air Volume CFM 2245 2245 3716 3716 3716 4663 4663 Flue and Alr Intake Flue Intake Size in cm 4 10 4 10 4 10 4 10 4 10 4 10 4 10 4 10 Air Intake Size in cm 4 10 4 10 4 10 4 10 4 10 5 13 5 13 5 13 Maximum Straight Flue Air Intake ft m 40 1 40 1 40 1 40 1 40 1 40 1 40 1 40 1 Do not exceed the maximum length of flue stated or heater may not operate properly 15 3 Technical Data Table All Models UHA S UHA S UHA S UHA S UHA S UHA S UHA S UHA S 150 175 200 225 250 300 350 400 Total Input Btu h x 1000 150 175 200 225 250 300 350 385 Total Output Btu h x 1000 123 143 5 164 184 5 205 246 287 315 7 Efficiency 96 82 82 82 82 82 82 82 82 Natural Gas G20 Data Inlet Pre
11. For supply connections use No 14 AWG or larger wires 17 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 9 5 Electrical Connection to the Heater Ss SS i s Connector Burner E TE E E N N E Y x Connect wires together with suitable approved wire connectors ma Junction Box Green to Ground White to L2 Black to L1 70 Note Junction box is not provided with heater Conduit can also be attached directly to heater with wire junction made within the heater cabinet 18 SECTION 10 OPERATION AND MAINTENANCE Installation service and annual inspection of the heater must be done by a contractor qualified in the installation and service of gas fired heating equipment Read this manual carefully before installation operation or service of this equipment All components are accessed via the door secured by 4 sheet metal screws Opening the door exposes live electrical connections and hot components A WARNING Electrical Shock Hazard Use extreme caution during start up Controls compartment contains live electrical connections Failure to follow these instructions can result in death or electrical shock 10 1 Pre Start Up Checks All pre start up checks must be carried out before lighting the heater Ensure that the heater and all controls are suitable for the gas pressure and electrical supply to which they a
12. Vent Box Description Part Number Concentric Vent Kit 150 250 UHVK1 Concentric Vent Box Top amp Side Assembly 90504113 Concentric Vent Box Bottom Assembly 90504112 Screw 6 x 3 8 Self Drilling 91119100 4 Vent Terminal with Baffle Plate 90502102R 6 Combustion Air Terminal 90502103 Description Part Number Concentric Vent Kit 300 400 UHVK2 Concentric Vent Box Top amp Side Assembly 90504013 Concentric Vent Box Bottom Assembly 90504012 Screw 6 x 3 8 Self Drilling 91119100 4 Vent Terminal with Baffle Plate 90502102R 8 Combustion Air Terminal 90502104 12 6 16 cm Minimum 4 Type B 1 Combustion Air Terminal 12 31 cm Maximum Vent Terminal with Baffle Plate Storm Collar By Others Attach with 3 sheet metal screws Model Vent Diameter UHAS 150 400 4 10 cm Model Air Intake Diameter UHAS 150 250 4 10 cm UHAS 300 400 5 13 cm SECTION 7 AIR SUPPLY SECTION 7 AIR SUPPLY 7 1 Separated Combustion Installation When installed as a separated combustion heater the air for combustion is drawn in from outside the building It is important to ensure that there is adequate space around heater to provide air for the axial air distribution fan 7 2 Unvented Installation It is important to e
13. a sealed compartment compartment Following any work cover re seal the compartment Flame probe with the gas pipe rubber Viewing port seal fully in place and all for flame probe screws fitted and tight Remove flexible air duct from spigot Ignition electrode Viewing port for ignition electrode TH Remove access plate Rubber Seal Remove screws and pull off burner cover 14 2 1 Burner Injectors Ensure gas tight fitting of injectors Ensure correct alignment with burners Ensure all pipe joints are gas tight Manifold i lE Burners Remove manifold oy screws and pull Injectors out manifold Unscrew Injectors f Marking f Folded UHA S UHA S UHA S UHA S UHA S UHA S UHA S UHA S 150 175 200 225 250 300 350 400 Orifice Quantity 7 8 9 10 11 12 14 14 Natural Gas G20 Orifice Marking 43 43 2 25 mm 2 25 mm 2 25 mm 40 40 40 RG 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 RG P N 91930135 91930135 91930054 91930054 91930054 91930145 91930053 91930053 32 SECTION 14 REPLACEMENT PARTS 14 3 Ignition Electrode and Flame Probe Limit Thermostat Flame Remove all
14. or of the combustion air inlet of any other appliance 6 2 Vent Installation A WARNING Fire Hazard Some objects will catch fire or explode when placed close to heater Keep all flammable objects liquids and vapors the required clearances to combustibles away from heater Failure to follow these instructions can result in death injury or property damage For vented units the vent must terminate outside of the building Vents must be fully sealed and correctly sized for the model If the vent passes through a wall or ceiling of combustible material it must be enclosed by a listed thimble and be separated from the thimble by at least a 2 5 cm air gap For separated combustion models vents and air intakes must be a fully sealed system and correctly sized for the model Vent should be assembled as detailed on Page 9 Figure 3 through Page 12 Figure 8 The joints between the vent terminal and the roof or wall must be properly sealed If the vent passes through a wall or ceiling of combustible material it must be enclosed by a listed thimble and be separated from the thimble by at least a 2 5 cm air gap Vents and air intakes must be adequately supported so that the heater does not bear the weight of the pipes For vent termination See Page 9 Figure 3 through Page 12 Figure 8 6 2 1 Standard Vented Heaters Models UHA 150 400 The vent must be fitted with a low resistance terminal See Page 9 Figure 3 thro
15. result in death or electrical shock All heater models require constant 120 V 60 Hz 10 power supply Check heater s rating plate for electrical rating for proper circuit sizing For servicing a disconnect switch of proper electrical rating should be installed in the vicinity of the heater All heaters are equipped with thermostat connections suitable to power a 24 V thermostat Heater must be wired and electrically grounded in accordance with local codes In the absence of local 9 2 Low Voltage Thermostat with One Heater SECTION 9 WiRING codes in accordance with United States refer to National Electrical Code ANSI NFPA 70 latest revision Canada refer to Canadian Electrical Code CSA C22 1 Part latest revision 9 1 Positioning Thermostats A room thermostat or ROBERTS GORDON control should be mounted on a vibration free wall or column at a height of approximately 5 1 5 m from the floor to measure the ambient temperature It should be clear of both cold drafts and the direct path of warm air from the heater Avoid mounting thermostat on outside walls or in areas directly exposed to radiant heat or sunlight Install wall tag in a visible location near thermostat 9 1 1 Fan Control The heater s axial fan can be used during the off season for air circulation A low voltage thermostat with fan control must be used See Page 15 Section 9 2 for thermostat connection details 24 Volt Thermostat Heating Only
16. s instructions If you cannot reach your gas supplier call the Fire Department WARNING Fire Hazard Do not store or use petrol or other flammable vapours and liquids in the vicinity of this or any other appliance Some objects will catch fire or explode when placed close to heater Failure to follow these instructions can result in death injury or property damage SECTION 11 USER INSTRUCTIONS 23 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 12 SERVICING 12 1 Servicing Instructions After start up the heater will require maintenance to be carried out annually If the heater is used in a dirty or dusty area more frequent maintenance may be necessary A WARNING Cut Hazard Turn off gas and electrical supply before maintenance Fan can start automatically at any time Failure to follow these instructions can result in severe injury or product damage NOTE 1 After any maintenance or repair work always test fire the heater in accordance with the start up instructions on Page 19 Section 10 through Page 21 Section 10 3 1 to ensure all safety systems are in working order before leaving the heater to operate Minor faults may be traced by using the troubleshooting charts on Page 27 Section 13 through Page 30 Section 13 5 NOTE 2 Check all gas pipes and pipe joints to ensure there are no cracks or gas leaks Any cracks in the pipes or pipe joints must be repaired NOT
17. support any of the heater s weight A gas meter is connected to the service pipe by the gas supply company An existing meter should be checked preferably by the company to ensure that the meter is adequate for the rate of gas supply required Installation pipes must be fitted in accordance with local and national codes Pipes of smaller size than the heater inlet gas connection should not be used 8 1 Connections Connect the heater to the gas supply ensuring that the final connections are as follows Gas supply pipe work is run in medium or heavy gauge tubing in compliance with local and national codes Figure 9 Gas Connection Hold gas nipple securely with pipe wrench when attaching the flex gas connector Do not twist flexible gas connector Ensure all joints are gas tight 14 Meter and service must be large enough to handle all the burners being installed plus any other connected load The gas pipe which feeds the system must be large enough to supply the required gas with a maximum pressure drop of 1 2 w c When gas piping is not included in the layout drawing contact the local gas supplier An isolating valve and union connection should be used and fitted into the supply adjacent to the heater e A minimum 1 8 NPT plugged tapping accessible for test connection must be installed immediately upstream of the gas supply connection to the heater For suspended heater
18. to notify you of possible fire electrical or burn hazards Please pay special attention when reading and following the warnings in these sections Installation Service and Annual Inspection of heater must be done by a contractor qualified in the installation and service of gas fired heating equipment Read this manual carefully before installation operation or service of this equipment Heaters are not approved for residential installation These instructions the layout drawing local codes and ordinances and applicable standards that apply to gas piping electrical wiring venting etc must be thoroughly understood before proceeding with the installation Thin sheet metal parts including the various venting components have sharp edges To prevent injury the use of work gloves is recommended Before installation 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 SECTION 1 HEATER SAFETY COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 2 INSTALLER RESPONSIBILITY The installer is responsible for the following To install the heater as well as the gas and electrical supplies in accordance with applicable specifications and codes Roberts Gordon recommends the installer contact a Local Building Inspecto
19. 16 9 4 UHA S Series Ladder Wiring Diagram 17 9 5 Electrical Connection to the Heater 18 SECTION 10 Operation and Maintenance 19 10 1 Pre Start Up 19 10 2 Begin 1 19 10 3 Complete the 21 SECTION 11 User Instructions 22 11 1 User Instructions eee 22 11 2 Heater Operation 22 11 3 Common User 22 11 4 Lighting Instructions eeeeenee 22 11 5 Simple 22 SECTION 12 Servicing 1 ciere aeree 24 12 1 Servicing Instructions eese 24 12 2 Burner 24 12 3 Fan Motor Assembly Maintenance 24 12 4 Heat Exchanger 24 12 5 Gas Valve Maintenance 24 12 6 Combustion Fan eee 24 12 7 Venting and Air Intake 24 12 8 Maintenance
20. E 3 Inspect all suspended components and hardware Ensure that they are in good condition properly tightened and corrosion free 12 2 Burner Maintenance 1 Open the door and remove the burner compart ment cover See Page 32 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 32 Section 14 2 3 Remove the ignition electrode and flame probe Check condition of ignition electrode and flame probe Clean off any deposits which may have been formed check condition of ceramic insulators Replace as necessary 24 12 3 Fan Motor Assembly Maintenance The main fan bearings are permanently sealed and do not need lubrication Before cleaning turn off gas and electrical supply Remove the fan and use a small brush or duster to clean the fan blades from each side Replace fan when done 12 4 Heat Exchanger Maintenance The heat exchanger will remain clean unless a problem has developed with combustion Inspect the heat exchanger Look for signs of overheating at the front tubes which may indicate burner over firing or persistently low air flows 12 5 Gas Valve Maintenance No regular maintenance is required on this device To change gas control valves See Page 31 Step 14 1 and Page 35 Section 14 5 Do not repair or disassemble gas valve Replace faulty gas valves with genuine ROBERTS GORDON replacement parts 12 6 Combustion Fan The combustion fa
21. FOR YOUR SAFETY If you smell gas Open windows DO NOT try to light any appliance DO NOT use electrical switches DO NOT use any telephone in your building Leave the building 6 Immediately call your local gas supplier after leaving the building Follow the gas supplier s instructions If you cannot reach your gas supplier call the Fire Department WARNING Fire Hazard Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance Some objects will catch fire or explode when placed close to heater Failure to follow these instructions can result in death injury or property damage A 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 Installation must be done by a contractor qualified in the installation and service of gas fired heating equipment or your gas supplier Quality in Any Language Copyright 2007 Roberts Gordon LLC SW RG S ROBERTS GORDON Sere UHA Series Tubular Unit Heaters Standard Range Installation Operation amp Service Manual Models UHA S 150 175 200 225 250 300 350 400 zzz 22222 22222 22222 goer Installer Please take the time to read and understand these instructions prior
22. NIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14 6 Ignition Control 14 8 Limit Switches The control mounts to the electrical plate Pull out 14 8 1 Removal and Replacement ignition cable and wiring from board noting their 1 Remove the electrical connections to the positions switch Release the four mounting standoffs 2 Unscrew the two screws securing the Refit in reverse Ensure correct location of ignition switch cabio angdall othar wiring 3 Fit a new switch with two screws See Page 38 Section 15 3 4 Reconnect the electrical connections and test operation 14 7 Axial Fan Guard Motor Assembly The axial fan unit for the heater is supplied completely assembled and balanced 14 7 1 Fan Removal and Replacement Remove the mounting hardware Description Part Number Qty Axial Fan UHA S 150 175 90710416 1 Axial Fan UHA S 200 250 90710417 1 Axial Fan UHA S 300 400 90710416 2 14 7 2 To Replace the Fan Assembly To replace the fan assembly reverse the procedure shown above e Check that the fan blades are free to rotate before turning on the power to the fan e Strictly comply with the color code of the fan wires to ensure correct operation See Page 16 Section 9 3 wiring diagram Use only genuine ROBERTS GORDON replacement parts 36 SECTION 15 SPECIFICATIONS SECTION 15 SPECIFICATIONS 15 1 Standard Models 150 400 UHA S Series Dimension Data
23. ameter Part Number UHA 150 400 4 10 cm 90502102 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 5 Standard Vented Heater Common Vertical Vent Termination SIDE VIEW Type B vent cap 7 or 8 may be used Aa are not available We Roberts Gordon Type B Vent Pipe i 18 46 cm Min Roof Flashing Roof The last section of vent pipe passing through the roof or wall may be Type B vent pipe All other vent materials in the building must be single wall vent pipe Fc Approved Thimble If Applicable Single Wall Pipe 4 10 cm lt 0 Single Wall Pipe TOP VIEW 10 4 10 cm D Area must equal sum Single Wall Pipe of open area of individual vents SECTION 6 VENTING Figure 6 Separated Combustion Heater Vertical and Horizontal Vent Termination 12 31 cm Minimum from air inlet to vent termination may be horizontal or vertical clearance Air Intake __ Vertical n Option 12 31 cm Horizontal Minimum from air inlet to vent Option termination may be horizontal 90 or vertical clearance Air Intake Air Intake Termination Vent Bass Termination 12 31 cm Minimum from wall t
24. an 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 5 1 Simple Troubleshooting Burner Faults If the burner fails to ignite for any reason it will retry for ignition 4 trials total After 4 unsuccessful ignition trials the control will put the heater into lockout for 1 hour Lockout should not occur during normal operation of the heater and indicates there is a fault condition which must be corrected There is an LED light on the ignition control that flashes codes to assist in fault correction See Figure 12 for LED indication codes Figure 12 LED Diagnostic Codes LED INDICATION FAULT MODE Slow Flash Normal Operation No call for heat Fast Flash Normal Operation Call for heat 2 Flashes Ignition Lockout No flame detected 3 Flashes Airflow Fault Pressure switch open or closed 4 Flashes Temperature Limit or Manual Reset Limit Switch Open 5 Flashes Flame Sense Error Gas valve not energized Steady On Internal Control Failure FOR YOUR SAFETY If you smell gas Open windows DO NOT try to light any appliance DO NOT use electrical switches DO NOT use any telephone in your building Leave the building 6 Immediately call your local gas supplier after leaving the building Follow the gas supplier
25. connections Condensate Drain when installed Flush drain and clear any obstructions 26 SECTION 13 TROUBLESHOOTING SECTION 13 TROUBLESHOOTING 13 1 General WARNING Explosion Hazard Installation must be done by a registered installer contractor qualified in the installation and service of gas fired heating equipment or your gas supplier Failure to follow these instructions can result in death injury or property damage Start Are gas amp electrical supplies on Turn on supplies Wait 10 15 minutes for limit Switch to cool Does fan stop running Does axial fan run immediately upon supplying Yes power to heater Fan and limit switch are operating normally Yes Replace temperature limit switch Burner has locked out due to ignition failure Use Troubleshooting for Automatic Ignition Burner Systems section to test burner Is ignition control showing a 2 flashes led code Yes Use Troubleshooting for Combustion Fan section to test fan Does the combustion fan run No The limit switch has tripped See Manual Reset No Limit Switch Figure With external controls i e thermostat on does the burner continue through the heating cycle No Has burner Locked Out No Replace limit switch Use Troubleshooting for Automatic Ignition Burner Syst
26. corrosive chemicals to ensure a longer life of the burner heat exchanger and other parts Failure to follow these instructions can result in property damage Roberts Gordon cannot be responsible for ensuring that all appropriate safety measures are undertaken prior to installation this is entirely the responsibility of the installer It is essential that the contractor the sub contractor or the owner identifies the presence of combustible materials corrosive chemicals or halogenated hydrocarbons anywhere in the premises Halogenated Hydrocarbons are a family of chemical compounds characterized by the presence of halogen ele ments 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 out side air supply must be provided to the burners whenever the presence of these compounds is suspected Warranty will be invalid if the heater is exposed to halogenated hydrocarbons 2 3 National Standards and Applicable Codes All appliances must be installed in accordance with the latest revision of the applicable standards and national codes This refers also to the electric gas and venting installation Note Additional standards for installations in public garages aircraft hangars etc may be applicable SECTION 3 CRITICAL CONSIDERATIONS 3 1 Ba
27. e 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 3 NOTE If the correct burner pressure cannot be reached then check the inlet pressure to the valve with the burner firing See Technical Data Tables on Page 38 Section 15 3 for inlet pressure requirement Do not continue to adjust the regulator if the pressure is not changing If the inlet pressure is too low to allow correct burner pressure setting then the gas inlet pressure must be corrected before completing the commission 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 Turn off heater and electrical supply 4 Remove the manometer and refit all covers to the valve and tighten the screw of the outlet pressure tap 10 2 3 Pressure Switch The pressure switch is factory pre set for each model and is not adjustable 10 2 4 Turning Off the Heater Set the thermostat to the OFF position or lowest setting and the main burner will stop The fan will run until it is s
28. ems section to test burner Ensure proper air flow clearance for axial fan Open louvers slightly Replace axial fan if it does not operate If problems persist contact Roberts Gordon LLC at www rg inc com Heater Operating TROUBLESHOOT ENDS 27 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 13 2 Troubleshooting For Automatic Ignition Burner Systems A WARNING Start Are gas amp electrical supplies on Turn on supplies Are external controls Electrical Shock Hazard i e Thermostat on Turn on controls Do not touch ignition components Voltage from ignition components is high Failure to follow these instructions can Press in reset button on result in death or electrical shock manual reset limit switch Is ignition control showing a 4 flashes led code Is 120 V supply at fan connections Does flue fan run Flue fan faulty replace Burner control faulty or wiring connections faulty Repair or replace as necessary Check for too much vent air inlet duct Check for blockage in vent and combustion air circuit Check for faulty air pressure Switch Check pressure switch hoses for leaks or cracks Do not attempt to circumvent pressure switch circuit to place unit in operation See Pressure Switch section for details Does air pressure switch change over Is ignition lead okay and co
29. er before servicing Failure to follow these instructions can result in death or electrical shock 11 2 Heater Operation When the heater has been switched on by the thermostat installed on site the main burner will automatically turn on The burner control box will control the safe ignition of the flame All heaters require a constant gas and electricity supply which must not be interrupted during the normal operation of this heater 11 3 Common User Controls 11 4 Lighting Instructions 11 4 1 To Turn On Heater 1 Ensure that the electrical and gas supplies to the heater are on Check that the on site controls are ON NOTE The thermostat setting must be above the ambient temperature for the heater to operate 2 The automatic firing sequence will begin as described on Page 20 Figure 10 The heater will now operate automatically under the control of the on site controls 11 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 22 11 5 Simple Troubleshooting Some possible reasons for the heater not operating are 1 Gas supply not ON 2 Electricity supply not ON 3 The time and or temperature controls are not ON 4 A limit switch may have operated This may be caused by an interruption of the electrical supply failure of the distribution f
30. esired For vents pitched up toward the vent terminal place the condensation drain within 5 1 5 m of the heater In noncombustible walls only vent terminal P N 02537801 1P may be used For 4 10 cm vents in either combustible or noncombustible walls use vent terminal P N 90502100 or equivalent insulated vent terminal Follow the manufacturer s instructions for proper installation Instead of an insulated vent terminal a listed thimble with 2 air gap may be used with a 4 vent cap P N 90502102 6 5 Vertical Venting Vertically vented heaters can be common vented up to 4 heaters For vent lengths greater than 5 1 5 m condensation will form Insulation is recommended and condensation drains may be desired Vent from the rear of the heater cabinet then run the vent vertically and use a condensate drain at the bottom of the vertical vent Vent pipe must be sloped 1 4 6 cm for every 1 3 m For 4 10 cm an approved vent cap P N 90502102 must be used For 6 15 cm common vent an approved vent cap P N 90502103 must be used For common vertical venting of more than two heaters See Page 10 Figure 5 A vent shall not extend less than 2 6m above the highest point where it passes through a flat roof of a building 6 6 Length Requirements If using vent lengths greater than 5 1 5 m condensation will form in the vent pipe Insulation and additional sealing measures high temperatu
31. ess 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 AFTS 100 73 standards High temperature silicone sealant must have a minimum temperature rating of 480 F 250 C 6 1 1 United States Requirements Vent must terminate at least 3 9 m above any forced air inlet located within 10 3 1 m Vent must terminate at least 4 1 2 m below 4 1 2 m horizontally from or 1 3 m above any door operable window or gravity air inlet into any building NFPA 54 ANSI Z223 1 latest revision National Fuel Gas Code specifies a 4 1 2 m horizontal vent terminal clearance from gas and electric meters regulators and relief equipment 6 1 2 Canadian Requirements The vent shall not terminate within 6 1 8 m of a SECTION 6 VENTING 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
32. gas supply pipe and electrical connections must not support any of the heater s weight SECTION 3 CRITICAL CONSIDERATIONS 3 7 Electrical Supply A permanent 120 V 60 Hz 1 electrical supply is required for the main electrical power The heater also requires suitable controls in accordance with Section 9 3 8 Vent Choose heater orientation to allow for the proper location of the vent Each heater must be fitted with a correctly sized sealed vent system If vented horizontally no other appliance may be connected to the vent See Page 7 Section 6 3 9 Separated Combustion Installation For separated combustion installation the vent and air intake must be fitted with an individual and correctly sized sealed system and the vent and air intake must terminate at approved wall and roof terminals Separated combustion units may not be common vented See Page 7 Section 6 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL A WARNING Fire Hazard Some objects will catch fire or explode when placed close to heater Keep all flammable objects liquids and vapors the required clearances to combustibles away from heater Failure to follow these instructions can result in death injury or property damage Figure 1 Installation Clearances and Clearances to Combustibles Installation Clearances Clearances to Combustibles venting shown 222 Optional separated combustion concentric 22
33. he 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 Roberts Gordon 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 39 Attach this information to the wall near the ROBERTS GORDON heater ROBERTS GORDON 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 Fire Hazard Some objects can catch fire or explode when placed IF THE HEATER WILL NOT OPERATE TO ENSURE YOUR SAFETY close to heate
34. lve 2 Turn up the thermostat above room temperature The automatic ignition sequence will now begin as described on Page 20 Figure 10 There will be no ignition of the burner and lockout will occur which proves the controls are operating correctly 19 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 10 Automatic Burner Control Sequence Burner Sequence for Ignition Control SHUT DOWN Thermostat 24 o o Flue Fan Cr e NO gt m re A witch T NC 30 Sec Purge J 30 Sec Post Purge ts 10 seconds Ignition Spark Start Gas Valve Flame Signal _ _ 30 Sec Delay D 90 Sec Delay gt 1 Purge time begins at pressure switch change over Axial Fan Required ing Signal peri 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 Signals Output By Control ee ae Figure 11 Gas Valve for Models UHA S 150 400 Top View End View Outlet Gas Inlet Pressure 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 Inlet Pressure 20 10 2 2 Start Up the Gas Valve All Gases 10 2 2 1 Check Burner Gas Pressure 1 Remov
35. must be free of dirt and dust Clean and reinstall as required Heat Exchanger Make sure there are no cracks See Page 14 Section 8 Make sure there is no sagging bending or distortion Clean or replace as required Gas Line and Shut off Valves Check for gas leaks See Page 14 Section 8 25 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Burner Observation Window Combustion Fan Scroll Wheel and Motor 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 Inshot Burners and Orifices Clear of obstructions even spider webs will cause problems Carefully remove any dust and debris from the burner Direct Spark Igniter Thermostat Replace if there are cracked ceramics excessive carbon residue or erosion of the electrode The electrode gap should be 1 8 3 2 mm There should be no exposed wire or damage to the device or wiring See Page 19 Section 10 Suspension Points Make sure the heater is hanging securely Look for signs of wear on the suspension materials or ceiling See Page 6 Figure 2 Silicone Tubing Ensure tight secure fit on all pressure fittings at pressure switch burner partition and blower outlet Gas Valve Verify that cap covering pressure regulator adjustment screw is secure and has not been tampered with Verify all wiring
36. n its intended purpose Incorrect gas or electrical supply accident fire floods acts of God war terrorism or other casualty Improper service use of replacement parts or accessories not specified by Roberts Gordon Failure to install or maintain the ROBERTS GORDON COMBAT UHA Series as directed in the Installation Operation and Service manual Relocation of the ROBERTS GORDON COMBAT UHA Series after initial installation The use of the ROBERTS GORDON COMBAT9 UHA Series in a corrosive atmosphere containing contaminants The use of the ROBERTS GORDON COMBAT UHA Series in the vicinity of a combustible or explosive material Any defect in the ROBERTS GORDON COMBAT UHA Series arising from a drawing design or specification supplied by or on behalf of the consumer Damage incurred during shipment Claim must be filed with carrier WARRANTY IS VOID IF The ROBERTS GORDON COMBAT UHA Series is not installed by an electrician qualified in the installation and service of control systems for heating equipment You cannot prove original purchase date and required annual maintenance history SECTION 16 THE ROBERTS GORDON COMBAT UHA SE The data plate and or serial number are removed defaced modified or altered in any way The ownership of the ROBERTS GORDON COMBAT UHA Series is moved or transferred This warranty is nontransferable Roberts Gordon is not permitted to inspect the damaged contr
37. n should not require maintenance However if the air pressure switch is causing burner lockout then remove the combustion fan 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 34 Section 14 4 Ensure that the fan is free to run and that the fan wheel is clean 12 7 Venting and Air Intake Pipe Inspect all venting and air intake pipe Ensure that all seams are sealed and suspension points secure Repair suspension points if any part of the venting or combustion air pipe is sagging Check to make sure any insulation is not missing or in poor condition Replace as necessary Check all venting and air intake components to ensure they are in good condition gas tight and corrosion free 12 8 Maintenance Checklist A WARNING Explosion Hazard 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 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 requiremen
38. ng Plate Refit in reverse to Vent Box Use new gaskets Screws Ensure sealed joints Gasket Ensure mounting plate orifice is clear and not obstructed Mounting Plate k E L Air Plat to Flue Fan us Screws 5 5 150 175 200 300 350 400 Exhaust Fan P N 90710405 90710403 90710402 IT IS IMPORTANT THAT ONLY THE CORRECT COMBUSTION FAN SPECIFIED FOR EACH MODEL TYPE IS USED WHEN REPLACING THESE ITEMS Carry out a start up after working on or changing a combustion fan See Page 22 Section 11 34 14 5 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 A WARNING Carbon Monoxide Hazard Use correct pressure switch specified for each model Use of incorrect pressure switch or disabling pressure switch circuit could cause unsafe condition Failure to follow these instructions can result in death or serious injury Carry out a commission after working on or changing a pressure switch See Page 19 Section 10 SECTION 14 REPLACEMENT PARTS UHA S UHA S UHA S UHA S UHA S 150 175 200 225 250 300 350 400 P N 90439802 90439808 90439803 90439807 90439808 Color Code yellow orange gray brown orange Set Point in w c 32 79 41 68 79 35 COMBAT UHA U
39. nnected Is spark electrode okay Ignition control faulty replace See Ignition Control section Wait 30 40 seconds Does ignition spark operate Yes Is the gas valve operating To test valve See Troubleshooting for Gas Valves section Does the flame light Replace valve Trace fault in supervision system See Troubleshooting for Flame Supervision System section Is the flame current at least 1 DC when Yes the flame ignites Is ignition control showing a 2 flashes led code If problems persist contact Roberts Gordon LLC at www rg inc com Heater Operating TROUBLESHOOT ENDS For your safety and optimum heater performance use only ROBERTS GORDON replacement parts Conduct start up procedure as shown on Page 19 Section 10 28 13 3 Troubleshooting for Flame Supervision System To measure flame current connect a 0 50 pA 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 Use General Troubleshooting section to trace the fault Is the flame present and atleast 1 uA DC flame current Is the connecting lead damaged Is the flame probe damaged or touching earthed components Is there a current flowing in the flame probe circuit with no flame present Yes
40. nsure 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 74 Outside Combustion Air Supply If outside combustion air supply is required separated combustion model UHAS heaters must be used IMPORTANT If the building has a slight negative pressure or corrosive contaminants such as halogenated hydrocarbons are present in the air an outside combustion air supply to the heater is required Seal all combustion air pipe joints The air supply duct may have to be insulated to prevent condensation on the outer surface The outside air terminal must not be more than 1 31 cm above the vent terminal 7 4 1 Length Requirements Follow the constraints listed on Page 8 Section 6 6 13 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 8 GAS PIPING A WARNING Fire Hazard Connect gas supply according to Figure 9 Gas can leak if not installed properly Failure to follow these instructions can result in death injury or porperty damage It is important that the gas supply pipe and the electrical connections do not
41. o vent termination Condensate Trap to Drain Optional Terminal P N 90502102 Terminal P N 90502102 90502105 Model Vent Diameter UHAS 150 400 4 10 cm Model Air Intake Diameter UHAS 150 250 4 10 cm UHAS 300 400 5 13 cm Listed Thimble through Combustible Wall Note Vent supports not shown Figure 7 Concentric Vent Box 4 10 cm or 5 13 cm Toward Outside Seal joint between single wall and Type B vent with silicone sealant Nes 15 cm or 8 20 cm Single Wall Inlet Air Pipe T Concentric By Others Toward Heater i 4 10 cm Single Wall Vent Pipe By Others Use 3 sheetmetal screws equally spaced around joint Vent Box Use 3 sheetmetal screws equally spaced around collar 11 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 8 Concentric Vertical and Horizontal Vent Termination Separated Combustion Heater 4 1 Vent 150 250 6 Dia Single Wall 300 400 lt 8 Dia Single Wall 25 Air Intake Vertical Option 10 3 Maximum wy Vent Terminal with Baffle Plate Storm Collar By Others Attach with 3 sheet metal screws Combustion Air Terminal Flashing By Others Condensate Trap to Drain Optional Horizontal Air Intake Option Concentric
42. oller 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 Roberts Gordon U S A 1250 William Street P O Box 44 Buffalo New York 14240 0044 716 852 4400 On the web at www rg inc com Roberts Gordon s liability and your exclusive remedy under this warranty or any implied warranty including the implied warranties of merchantability and fitness for a particular purpose is limited to providing replacement parts during the term of this warranty Some jurisdictions do not allow limitations on how long an implied warranty lasts so this limitation may not apply to you There are no rights warranties or conditions expressed or implied statutory or otherwise other than those contained in this warranty Roberts Gordon shall in no event be responsible for incidental or consequential damages or incur liability for damages in excess of the amount paid by you for the ROBERTS GORDON COMBAT UHA Series Some jurisdictions do not allow the exclusion or limitation of incidental or consequential damages so this limitation or exclusion may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from jurisdiction to jurisdiction Roberts Gordon shall not be responsible for failure to perform under t
43. on 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 use only genuine ROBERTS GORDON replacement parts Conduct start up procedure as shown on Page 19 Section 10 30 SECTION 14 REPLACEMENT PARTS SECTION 14 REPLACEMENT PARTS See warnings and notes on Page 24 Section 12 before removing or replacing parts Burner Components All serviceable burner parts are accessed by the door on the side of the heater Remove the sheetmetal screws 14 1 Gas Valve Remove the gas supply pipe at the heater inlet Description Part Number Gas Valve NG Models UHA S 150 225 90032505 Gas Valve LP Models UHA S 150 225 90032506 Gas Valve NG Models UHA S 250 400 90032520 Gas Valve LP Models UHA S 250 400 90032521 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 21 Section 10 2 2 IT IS IMPORTANT THAT ONLY THE CORRECT GAS VALVE IS USED WHEN REPLACING THESE CONTROLS 31 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14 2 Burner Compartment The burner compartment is Eus
44. r FOLLOW THESE INSTRUCTIONS TO SHUT DOWN YOUR HEATER Keep all flammable objects liquids and vapors the required clearances to combustibles away from heater 1 Set the thermostat to off or the lowest setting 2 Turn off electric power to the heater 3 Turn off the manual gas valve in the heater supply line Failure to follow these instructions can result in death 4 Call your installer contractor qualified in the installation and service injury or property damage of gas fired heating equipment Installation Clearances Clearances to Combustibles Roof Terminal i S SS combustion concentric p venting shown dp Wall Terminal Rear Max A Height 4 Right lt Left p Models 30 125 Models 150 400 Models 30 125 150 400 Models 30 125 150 400 Top 1 2 5 cm 6 15 cm Top 1 2 5 cm 6 15 cm Bottom 0 0 cm 3 8 cm Rear 18 46 cm 24 61 cm Ri x 7 2 ght 1 2 5 cm 31 79 cm Max Mounting Height 12 3 7 m 20 6 m 20 6 m 30 9 4 S eg 2 em em Cm Left 18 46 cm 6 15 cm Heaters can be mounted higher if destratification fans are installed See Installation Operation Vent 2 5 cm 2 5 cm and Service Manual for specific mounting height recommendations NOTE Venting directly from top of heater not applicable on Models 150 400
45. r or Fire Marshal for guidance To use the information given in a layout drawing and in the manual together with the cited codes and regulations to perform the installation To install the heater in accordance with the clearances to combustibles To furnish all needed materials not furnished as standard equipment To plan location of supports vents and air intakes To provide access for servicing To provide the owner with a copy of this Installation Operation and Service Manual To never use heater as support for a ladder or other access equipment and never hang or suspend anything from heater To ensure there is adequate air circulation around the heater and to supply air for combustion ventilation and distribution in accordance with local codes 2 1 Wall Tag A laminated wall tag is included with the heater as a permanent reminder of the safety instructions and the importance of the required clearances to combustibles Affix the tag by peeling off the backing of the adhesive strips on the rear surface and position the tag on a wall near the heater A copy of the wall tag P N 91040031 is illustrated on the back cover Know your model number Model number is found on the heater and in the Installation Operation and Service Manual See Page 9 Figure 3 through Page 14 Figure 9 2 2 Corrosive Chemicals A CAUTION Do not use heater in an area containing corrosive chemicals Avoid the use of
46. re silicone at all seams are required The entire vent should be insulated with foil faced fiberglass insulation 1 2 thick 1 1 2 density minimum Maximum Vent Lengths Table Model UHA S 150 400 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 5 20 ft 6 1 m SECTION 6 VENTING 6 7 Vent Material Figure 3 Vent and Roof Detail Vent material may be single wall 26 ga minimum galvanized steel or equal thickness stainless steel Completely seal all joints refer to Page 7 Section 6 2 If penetrating a combustible wall or roof a listed rd thimble with 2 B 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 d manufacturer s clearance from vent material is or Rain Collar maintained Seal annular space of the type B 1 vent as well as all joints in the remaining vent 7 gt FIA gt PAA 2 Air Gap to Combustible Material Flashin a Vent Figure 4 Standard Vented Heater Vertical and Horizontal Vent Termination 2 Clearance 4 Dia Vent 7 Thimble Vertical 2 Clearance Option Flashing PA Horizontal A By Others I Option Terminal P 12 31 cm Condensate Minimum Note Vent supports Trap to Drain not shown Optional Model Vent Di
47. re to be connected 10 1 1 Louvers Where fitted the air delivery louvers need to be set during start up to give the required air distribution optional vertical louvers WARNING Cut Hazard Turn off gas and electrical supply before maintenance Fan can start automatically at any time Failure to follow these instructions can result in severe injury or product damage SECTION 10 OPERATION AND MAINTENANCE 10 1 2 Electrical Checks All pre start up checks must be carried out before start up the heater 1 Check that all site wiring is connected in accordance with the appropriate wiring diagram on Page 16 Section 9 3 10 1 3 Gas Supply All aspects of the gas installation including the gas meter must be inspected tested for gas tightness and purged in accordance with local and national codes Ensure that the air is fully purged from the heater inlet pipe up to the main gas valve inlet test nipple 10 1 4 Mechanical Checks 1 Check that the fan is free to run and delivery louvers are turned to give required air deflection 2 Check that the flue and air intake for separated combustion units is installed in accordance with these instructions and local regulations 10 2 Begin Start Up 10 2 1 Before Operating the Heater To ensure that all the controls are in safe working order operate the heater for the first time with the isolating gas valve turned off and power supply turned on 1 Turn off the isolating gas va
48. rights herein may be reproduced or copied in any form or by any means graphic electronic or mechanical including photocopying recording taping or information storage and retrieval systems without the written permission of Roberts Gordon LLC Printed in U S A TABLE OF FIGURES Figure 1 Installation Clearances and Clearances to Combustibles i ee ee es 4 Figure 2 Suspension Methods 6 Figure 3 Vent and Roof 9 Figure 4 Standard Vented Heater Vertical and Horizontal Vent Termination 9 Figure 5 Standard Vented Heater Common Vertical Vent Termination ch Petite p a 10 Figure 6 Separated Combustion Heater Vertical and Horizontal Vent Termination 11 Figure 7 Concentric Vent Box 11 Figure 8 Concentric Vertical and Horizontal Vent Termination Separated Combustion Heater 12 Figure 9 Gas Connection sseeeeeeee 14 Figure 10 Automatic Burner Control Sequence 20 Figure 11 Gas Valve for Models UHA S 150 400 20 Figure 12 LED Diagnostic 22 SECTION 1 HEATER SAFETY Your Safety is Important to Us This symbol is used throughout the manual
49. s an approved metal flexible connection between the isolating valve and the heater may be used To reduce pressure loss use one pipe size larger than the heater gas connection IMPORTANT The complete installation must be purged and tested for gas soundness in accordance with local and national codes Do not high pressure in excess of 1 2 psi 14 w c test the gas piping with the burner connected Close manual shut off valve during any pressure testing equal to or less than 1 2 psi 14 w c Failure to follow these instructions can result in property damage Check the pipe and tubing ends for leaks before placing heating equipment into service When checking for gas leaks use a soap and water solution never use an open flame Option A Stainless Steel Flex Gas Connector Do not bend flexible gas connector sharply Option B Medium or Heavy Gauge Pipe Gas Connector Gas Shut off Valve E a Drip Leg Union Cap Connection SECTION 9 WIRING WARNING Electrical Shock Hazard Disconnect electrical power and gas supply before servicing This appliance must be connected to a properly grounded electrical source Failure to follow these instructions can
50. sic Information UHA S heaters have automatic ignition burners for ON OFF operation only 3 2 Location and Suspension All models Must be installed indoors Must be installed in a level position with horizontal discharge May be mounted on a shelf of non combustible material May be suspended from above See Page 6 Figure 2 or from wall brackets of sufficient strength to support the heater as listed in the Dimension Data Table on Page 37 Section 15 1 Drop rods must be a minimum of 3 8 diameter mild steel Four suspension points 3 8 nuts are located on top of the heater Must be installed in a manner which allows access to all serviceable components See Page 4 Figure 1 for details 3 3 Minimum Required Installation Clearances Clearances around the heater and vent must be as indicated on Page 4 Figure 1 Page 9 Figure 3 through Page 12 Figure 8 to ensure access for servicing and correct operation 3 4 Clearances to Combustibles Clearances must be as indicated on Page 4 Figure 1 If clearances to combustibles are not indicated then installation clearances apply 3 5 Ventilation It is important to ensure that there is adequate air space around the heater to supply air for combustion ventilation and distribution in accordance with local and national codes 3 6 Gas Supply It is important that the gas supply pipe is sized correctly to provide the inlet pressure as stated on the heater data plate The
51. ssure 5 0 in w c Min 14 in w c Max Burner Pressure in w c 3 2 3 4 3 7 3 7 4 0 2 7 2 5 3 8 LPG Propane G31 Data Inlet Pressure Inlet Pressure 12 0 in w c Min 14 in w c Max Burner Pressure in 9 9 10 4 10 5 10 7 10 7 9 4 9 3 11 1 38 SECTION 16 THE ROBERTS GORDON COMBAT UHA SERIES WARRANTY ROBERTS GORDON WILL PAY FOR Within 24 months from date of purchase by buyer or 27 months from date of shipment by Roberts Gordon whichever comes first replacement parts will be provided free of charge for any part of the product which fails due to a manufacturing or material defect Roberts Gordon will require the part in question to be returned to the factory Roberts Gordon will at its sole discretion repair or replace after determining the nature of the defect and disposition of part in question ROBERTS GORDON Replacement Parts are warranted for a period of 18 months from date of shipment from Roberts Gordon or the remaining ROBERTS GORDON COMBAT UHA Series warranty ROBERTS GORDON WILL NOT PAY FOR Service trips service calls and labor charges Shipment of replacement parts Claims where the total price of the goods have not been paid Damage due to Improper installation operation or maintenance Misuse abuse neglect or modification of the ROBERTS GORDON COMBAT UHA Series in any way Use of the ROBERTS GORDON COMBAT UHA Series for other tha
52. that the weight is taken at the support points 5 2 Suspension A WARNING Crush Hazard Use 3 8 threaded rod minimum Failure of the supports can result in death injury or property damage For typical suspension See Page 6 Figure 2 Figure 2 Suspension Methods Ensure all suspension hardware is torqued to ee a minimum of 20 ft Ibs Cone Point Set Pin Threaded Rod Nut in m Washer Nut Support Points SECTION 6 VENTING 6 1 Venting This heater must be vented in accordance with the rules contained in this manual and with the following national codes and any state provincial or local codes which may apply United States Refer to NFPA 54 ANSI 2223 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 an listed thimble to conform with the above codes The heater may be installed unvented in certain circumstances according to building ventilation codes Refer to the above codes and Page 8 Section 6 3 for further information Unvented operation also requires compliance with the clearances to combustibles given on Page 4 Figure 7 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 l
53. the Code for Motor Fuel Dispensing Facilities and Repair Garages NFPA 30A latest revision heaters must not be installed less than 8 2 4 m above the floor 4 4 Electrical The heater must be electrically grounded in accordance with the following codes United States Refer to National Electrical Code NFPA 70 latest revision Wiring must conform to the most current National Electrical Code local ordinances and any special diagrams furnished Canada Refer to Canadian Electrical Code CSA C22 1 Part 1 latest revision 4 5 Venting The venting must be installed in accordance with the requirements within this manual and the following codes United States Refer to NFPA 54 ANSI Z223 1 latest revision National Fuel Gas Code Canada Refer to CSA B149 1 Natural Gas and Propane Installation Code 4 6 High Altitude These heaters are approved for installations up to 2000 610 m US 4500 1370 m Canada without modification Consult factory if US installation is above 2000 610 m or Canadian installation is above 4500 1370 m COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 5 MAJOR COMPONENTS 5 1 General Heaters are designed for installation above 6 1 8 m These heaters must be installed within the heated space Duct delivery systems are not permitted with axial fan units When handling or supporting the heater from below ensure
54. 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 P N 111101NA 10 07 Rev D TABLE OF CONTENTS SECTION 1 Heater Safety eene 1 1 1 Manpower Requirements 1 SECTION 2 Installer Responsibility 2 2 1 Wall Tag reete cee 2 2 2 Corrosive Chemicals sese 2 2 3 National Standards and Applicable Codes 2 SECTION 3 Critical Considerations 3 3 1 Basic 3 3 2 Location and Suspension 3 3 3 Minimum Required Installation Clearances 3 3 4 Clearances to 3 3 5 Ventilation 3 3 6 Gas Supply thee etie epe rers 3 3 7 Electrical 3 3 8 Veritate ea 3 3 9 Separated Combustion Installation 3 SECTION 4 National Standards and Applicable Codes 5 4 1 Gas
55. topped automatically by the fan thermostat Do not use a disconnect switch for control of heater Disconnect switch will turn off the fan Heat exchanger could be damaged Warranty will not cover damage to the heat exchanger if operated improperly Only use the disconnect switch for turning off heater for service or during off season C SECTION 10 OPERATION AND MAINTENANCE 10 2 5 External Controls External controls may include time switch interlock switch room thermostat and frost thermostat Operate each control to ensure that they function correctly Set the switches if fitted and thermostat s to the users requirements 10 3 Complete the Start Up Ensure that all covers are fitted correctly and all test points are properly sealed 10 3 1 Instruction to the User Explain the controls of the heater to the user including how to turn it on and off using the controls fitted on site Give this manual to the user Ensure that the user is shown and understands the importance of maintaining clearances to combustibles and the user instructions on Page 22 Section 11 through Page 22 Section 11 5 and all warnings defined in this manual 21 COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 11 USER INSTRUCTIONS 11 1 User Instructions The UHA S Series heaters are fully automatic and operate from the external controls fitted on site A WARNING Electrical Shock Hazard Disconnect electrical pow
56. ts set forth in the ROBERTS GORDON manuals and all applicable governmental authorities pertaining to the installation service and operation of the equipment To help facilitate optimum performance and safety Roberts Gordon recommends that a qualified contractor annually inspect your ROBERTS GORDON equipment and perform service where necessary using only replacement parts sold and supplied by Roberts Gordon The Vicinity of the Heater Do not store or use flammable objects liquids or vapors near the heater Immediately remove these items if they are present See Page 3 Section 3 Vehicles and Other Objects Maintain the clearances to combustibles Do not hang anything from or place anything on the heater Make sure nothing is lodged in between the heat exchanger or in the louvers Immediately remove objects in violation of the clearances to combustibles See Page 3 Section 3 Vent Pipe Terminals Venting must be intact Using a flashlight look for obstructions cracks on the pipe gaps in the sealed areas or corrosion The area must be free of dirt and dust Remove any carbon deposits or scale using a wire brush If the vent terminal has a screen built in remove any dirt dust or deposits from the screen See Page 13 Section 7 Combustion Air Intake Pipe Intake pipe and inlet must be intact Look for obstructions cracks on the pipe gaps in the sealed areas or corrosion The area
57. ugh Page 9 Figure 4 Standard vented heaters do not allow outdoor air intake for combustion air COMBAT UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 6 2 2 Separated Combustion Heaters Models UHAS 150 400 The heaters are designed to be installed as separated combustion heaters The vent and air intake are run as separate pipes to the wall or roof terminals See Page 12 Figure 8 As an option the vent and air intake are run as separate pipes to a concentric vent box and a concentric vent air intake pipe penetrates the wall or roof 6 3 Unvented Operation A WARNING Carbon Monoxide Hazard Heaters installed unvented must be interlocked with sufficient building exhaust Heaters must be installed according to the installation manual Failure to follow these instructions can result in death or injury For unvented operation in commercial installations sufficient ventilation must be provided in the amount of 4 cfm per 1000 Btu h firing rate United States 3 cfm per 1000 Btu h firing rate Canada WARNING Combustion by products contain a chemical known to the State of California to cause cancer and birth defects or other reproductive harm 6 4 Horizontal Venting Horizontally vented heaters must be individually vented Vent pipe must be sloped 4 6 cm for every 1 3 m For vent lengths greater than 5 1 5 m condensation will form Insulation is recommended and condensation drains may be d
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