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Roberts Gorden 150 - page 1
Installation, Operation & Ser vice Manual Models UHA[S] 150, 175, 200, 225 250, 300, 350, 400 P / N 1111 0 1 N A 1 0 / 0 7 R e v . D UHA-Series T ubular Unit Heaters (Standard Range) W ARNING FOR Y OUR SAFETY If you smell g as: 1 . Open windo ws. 2. DO NO T try to light an y appliance. 3. DO NO T use electrical s witches. 4. DO NO T use any t e ...
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Roberts Gorden 150 - page 2
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Roberts Gorden 150 - page 3
© 2007 R ober ts-Gordon, LLC All rights reserved. No part of this work cover ed by the cop yr ights her ein may be r eproduced or copied in any form or by any means - graphic, electr onic, or mechanical, including photocop ying, recor ding, taping or inf ormation stor age and retrie val sy stems - w ithout the writt en per mission of R ober ts-Gor ...
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Roberts Gorden 150 - page 4
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Roberts Gorden 150 - page 5
TABLE OF FIGURES Figur e 1: Installation Clearances and Clearances to Comb ustibles ..................... .............. .............. ............ 4 Fi gure 2: Suspension Methods .......................... .............. ......... 6 Figur e 3: V ent and R oof Detail .... .............. ........... ............ ......... 9 Figur e 4: Standard V en ...
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Roberts Gorden 150 - page 6
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Roberts Gorden 150 - page 7
SECTION 1: H EATER S AF ETY 1 SECTION 1: HEATER SAFETY Y our Saf et y is Important to Us! This sy mbol is used thr oughout the manual t o notify you of possib le fir e, electrical or burn hazar ds. Please pa y special at tention when r eading and f ollowing the w ar nings in these sections. Installation, Service and Annual Inspection of heat er mus ...
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Roberts Gorden 150 - page 8
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 2 SECTION 2: INSTALLER RESPONSIBILITY The installer is r esponsible for the f ollow ing: • T o install the heat er , as well as the g as and electrical supplies, in accor dance with applicab le specifications and codes . Rober ts-Gor don r ecommends the installer cont ac ...
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Roberts Gorden 150 - page 9
SECTION 3: C RITIC AL C ONSIDERATIONS 3 SECTION 3: CRITICAL CONSI DERATIONS 3.1 Basic Inf ormation UHA(S) heater s hav e automatic ignition b ur ners f or ON/OFF operation only . 3.2 Location and Suspension All models: • Must be inst alled indoors . • Must be inst alled in a le v el position wi th horizontal d ischarge . • Ma y be mount ed on ...
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Roberts Gorden 150 - page 10
W ARNING 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 a way from heater . Failure to follo w these instructions can result in death, injury or property damage. COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVI ...
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Roberts Gorden 150 - page 11
SECTION 4: N ATIONAL S TANDARDS AND A PPLICABLE C ODES 5 SECTION 4: NATIONAL STANDARDS AND APPLICABLE CODES 4.1 Gas Codes The type of gas appearing on the nameplat e must be the type of gas used. In stallation must comply with nationa l and local codes and requir ements of the local gas compan y . Unit ed Stat es: Ref er t o NFP A 54/ANSI Z223.1 - ...
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Roberts Gorden 150 - page 12
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 6 SECTION 5: MAJOR COMPONENTS 5.1 Gener al Heater s are designed f or installation abo v e 6' (1 .8 m). These heater s must be installed w ithin the heated space. D uct delivery sy stems a re not permitt ed with axial f an units. W hen handling or suppor ting the heat ...
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Roberts Gorden 150 - page 13
SECTION 6: V ENTI NG 7 SECTION 6: V ENTING 6.1 V enting This heat er must be v ented in accor dance with the rules contained in this man ual and w ith the f ollowing national codes and an y state , pro vincial or local codes which ma y apply: United States: Re f e r to NFP A 54/ANSI Z223.1 - latest r evision, National F uel Gas C ode; Canada: R ef ...
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Roberts Gorden 150 - page 14
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 8 6.2.2 Separ ated Comb ustion Heater s (Models UHA S 150 - 400) The heat ers ar e designed to b e installed as separat ed combustion heat ers. Th e vent a nd air intak e are run as separat e pipes t o the wall or roo f te r mi nal s. See P age 1 2, F igure 8 . As an optio ...
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Roberts Gorden 150 - page 15
SECTION 6: V ENTI NG 9 6.7 V ent Mat erial V ent material may be single w all 26 ga. (minimum) gal vaniz ed steel or equal thic kness stainless st eel. Comp letely seal all joint s, r efer t o Pa g e 7 , Section 6.2 . If penetrating a comb ustible w all or roof , a listed thimbl e with 2" (5 cm) clear ance must be used. Wher e local codes perm ...
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Roberts Gorden 150 - page 16
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 10 F igure 5: Standar d V ented Heat er - Common V er tical V ent T er mination Roof 1 8" (46 cm) Min. T ype "B" vent cap (7" or 8") may be used. (These are not a vailable from R ober ts-Gordon.) Roof Flashing Appro ved Thimble (If Applicable) T yp ...
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Roberts Gorden 150 - page 17
SECTION 6: V ENTI NG 11 F igur e 6: Separat ed Combustion Heat er - V ertical and Horizontal V ent T ermination V ent T er mination Listed Thimble thr ough Comb ustible Wall V ent 1 2" (31 cm) Minimum from wall to v ent ter mination. Air Intak e Condensat e T rap to Drain (Optional) 1 2" (31 cm) Minimum from air inlet t o vent termination ...
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Roberts Gorden 150 - page 18
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 12 F igure 8: Concen tric V ertical and Horiz ontal V ent T er mination V ent Air Int ake* Concentric V ent Bo x V er tical Option 1 0' (3 m) Maximum Horizontal Option Concentric V ent Bo x V ent Comb ustion Air T erminal V ent T er minal with Baf fle Plat e Flashing ...
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Roberts Gorden 150 - page 19
SECTION 7: A IR S UPPLY 13 SECTION 7: AIR SUPPLY 7 .1 Separ ate d Combustion In stallation When installed as a separ ated comb ustion heat er , the air f or combustion is dra wn in from outside the buildin g. It is important to ensur e that there is adequat e space around heater t o pro vide air f or the axial air distribution f an. 7 .2 Un vent ed ...
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Roberts Gorden 150 - page 20
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 14 SECTION 8: GAS PIPING W ARNING Fire Hazard Connect gas supply according to Figure 9. Gas can lea k if not installed properly . Failure to follo w these instructions can result in death, injury or property damage. Fire Ha za rd Connect gas supply according to Fi g ur e 9 ...
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Roberts Gorden 150 - page 21
SECTION 9: W IR I NG 15 SECTION 9: WIR ING W ARNING Electrical Shoc k 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 result in death or electrical shoc k . All heater models r equir e constan t 1 20 V 60 Hz 1Ø po ...
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Roberts Gorden 150 - page 22
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 16 9.3 UHA(S) Series Int ernal W iring Dia gram BLUE BLACK BLACK ORANGE ORANGE YELLOW BROWN BLACK WHITE WHITE L2 L1 ORANGE ORANGE BLACK BLACK GREEN WHITE WHITE GREEN GREEN BLUE BLACK BLACK BLACK WHITE GREEN BLUE GREEN YELLOW 24 VAC HOT GROUND FLAME BLACK BLACK BLACK 6 3 4 ...
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Roberts Gorden 150 - page 23
SECTION 9: W IR I NG 17 9.4 UHA(S) Ser ies Ladder Wir ing Diagr am FLAME SENSOR PRESSURE SWITCH THERMOST A T CONNECTION 6 3 4 5 2 1 1 2 0 VAC TRANSFORMER COMBUSTION BL O WER CIRCULA TION F AN CIRCULA TION F AN UH 300, 350, 400 Only GAS VA LV E ELECTRODE IGNITION MODULE FLAME SP ARK LIMIT SWITCH LIMIT SWITCH (UH 300, 350, 400 ONL Y) MANUAL RESET LIM ...
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Roberts Gorden 150 - page 24
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 18 9.5 Electrical Connec tion to the Hea ter BX Connect or Junction Bo x Fle xible C onduit Burner Connect wir es together with suitab le approv ed wir e connect ors . Green t o Ground Whit e to L2 Black t o L1 L1 L2 Ground Black Whit e Green Note: J unction box is not pro ...
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Roberts Gorden 150 - page 25
SECTION 1 0: O PERATION AND M AINT ENANCE 19 SECTION 1 0: OPER ATION AND MAINTENANCE Installation, service, and ann ual inspection of the heat er must be done b y a contract or qualified in the installation and service of gas-f ired heating equipment. R ead this manu al carefully bef ore installation, oper ation, or ser vice of this e quipment. All ...
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Roberts Gorden 150 - page 26
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 20 F igure 1 0: Aut omatic Burner Control Sequence Burner Sequence for Ignition Contr ol Flame Signal Start Gas V alv e Ignition Spark Thermostat 24 V SHUT DO WN RU N ST ART ts = 1 0 seconds Signals Output By Contr ol Requir ed Incoming Signals Flue F an P ressure Sw itch ...
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Roberts Gorden 150 - page 27
SECTION 1 0: O PERATION AND M AINT ENANCE 21 1 0.2.2 Start-Up the Gas V alv e (All Gases) 1 0.2.2.1 Chec k Burner Gas P ressur e 1 . R emov e the plug in the outlet (burner) pressur e test point and connect a pr essur e tap and a manom et er . 2. With the b ur ner f iring, measur e the pressur e on the manomet er . T o adjust the b ur ner pressur e ...
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Roberts Gorden 150 - page 28
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 22 SECTION 1 1: USER INSTRUCTIONS 1 1 .1 User Instr uctions The UHA(S) Series heater s are fully aut omatic and operat e from the e xternal controls f itt ed on site . W ARNING Electrical Shoc k Hazard Disconnect electrical pow er before servicing. Failur e to follo w thes ...
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Roberts Gorden 150 - page 29
W ARNING FOR Y OUR SAFETY If you smell g as: 1 . Open windo ws. 2. DO NO T try to light an y appliance. 3. DO NO T use electrical s witches. 4. DO NO T use any t elephone in your b uilding. 5. Leav e the build ing. 6. Immediatel y call your local gas supplier af ter leaving the b uilding. F ollow the gas supplier s instructions. 7 . If you cann ...
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Roberts Gorden 150 - page 30
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 24 SECTION 1 2: SER VICING 1 2.1 Ser vicing Instr uctions Af ter start-up, the heat er will re quire maint enance to be carried out annually . If the heat er is used in a dir ty or dust y ar ea, more fr equent maintenance ma y be necessary . W ARNING Cut Hazard T urn off g ...
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Roberts Gorden 150 - page 31
SECTION 1 2: S ERVICING 25 1 2.8 Maintenance Checklist W ARNING Explosion Hazard Service and annual inspection must be done b y a contract or qualified in the installation and service of gas-fir ed heating equipment or your gas supplier . T urn of f gas and electrical supplies bef ore performing service or maintenance. Failur e to follo w these ins ...
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Roberts Gorden 150 - page 32
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 26 Burner Observ ation Win dow Mak e sure it is clean and fr ee of crac ks or holes. Clean and r eplace as r equired. Combu stion F an Scroll, Wheel and Mot or Compr essed air or a vacuum clea ner ma y be used to clean dust and dir t. Inshot Burner s and Orif ices Clear of ...
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Roberts Gorden 150 - page 33
SECTION 1 3: T R OUBLESHOOTING 27 SECTION 1 3: T R OUBLESHOOTING 1 3.1 General Ensure pr oper air flow clearance f or axial fan. Open louver s slightly . Replace axial f an if it does not operate . If prob lems persist, contact Roberts-Gordon, LLC at www .rg-inc.com Heater Operating TROUBLESHOO T ENDS. No Replace limit switch. The limit s witch has ...
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Roberts Gorden 150 - page 34
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 28 1 3.2 T r oubleshootin g F or A uto matic Ignition Burner S yst ems If prob lems persist, contact Roberts-Gordon, LLC at www .rg-inc.com Heater Operating TROUBLESHOO T ENDS. No T race fault in supervision sy stem. See T roubleshooting for Flame Supervision Sy stem secti ...
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Roberts Gorden 150 - page 35
SECTION 1 3: T R OUBLESHOOTING 29 1 3.3 T r oubleshooting f or Flame Supervision S yst em NO TE: Minimum flame pr obe current 1 μA DC . T ypical flame pr obe current 3-5 μA DC . Repair or r eplace as necessary . If prob lems persist, contact Roberts-Gordon, LLC at www .rg-inc.com Replace ignition contr ol. Use General T roubleshooting section to ...
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Roberts Gorden 150 - page 36
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 30 1 3.4 T r oubleshooting fo r Gas V alv es V alve f ault y . Replace with one of correct type. F ault elsewhere. Corr ect pressure pr oblem. If prob lems persist, contact Roberts-Gordon, LLC at www .rg-inc.com V alve Oper ating TROUBLESHOO T ENDS. No Ye s V alve or ignit ...
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Roberts Gorden 150 - page 37
SECTION 1 4: R EPLACEMENT P ARTS 31 SECTION 1 4: REPLACEMENT P AR TS See warnings and not es on P age 24, Section 1 2 bef ore remo ving or replacing par ts . Burner Componen ts All ser viceab le burner par ts are accessed b y the door on the side of the heat er . Remo v e the sheetmetal scr ews. 1 4.1 Gas V alve R emov e the gas supply pipe at the ...
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Roberts Gorden 150 - page 38
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 32 1 4.2 Burner Compartment Remo ve f le xible air duct from spigot Remo ve access plate Remo ve scr ews and pull of f burner cov er View ing por t for f lame probe View ing por t for ignition electr ode Flame probe Burner compar tment cov er Rubber Seal Ignition electrode ...
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Roberts Gorden 150 - page 39
SECTION 1 4: R EPLACEMENT P ARTS 33 1 4.3 Ignition Electrode and Flame P robe Flame P robe Ignition Electrode Remo ve Sc rew Ignition Electrode Burners Flame P robe Burners Burner Compar tment F ront Views Remo ve all burner compar tment scre ws to remo ve the burner compar tment and access the "F ront View". Limit Thermostat .1 20 (3 mm) ...
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Roberts Gorden 150 - page 40
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 34 1 4.4 Combustion F an V er tical Installation V ent Box Outlet Gasket Flue Fan V ent Box Screws Flue Adapter Flue Adapter to Flue Fan screws Rear Panel Hole Disconnect electrical connections at plug in tabs. Mounting Plate to V ent Box Screws Mounting Plate Gasket Air P ...
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Roberts Gorden 150 - page 41
SECTION 1 4: R EPLACEMENT P ARTS 35 1 4.5 Pr essure S witch P ull of f 3 wa y connector . Spring open plastic clips of mounting cradle . Repla ce with correct type of pr essure s witch f or model. The pr essure s witches are colo r coded f or each pressur e set ting. Carbon M onoxide Hazard Use correct pressure switch specified for each model. Use ...
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Roberts Gorden 150 - page 42
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 36 1 4.6 Ignition Control The contr ol mounts t o the electrical plate . P ull out ignition cab le and w iring from boar d, noting their positions. Re lease the f our mounting st andof fs. Ref it in re ver se. Ensur e correct location of ignition cabl e and all other w iri ...
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Roberts Gorden 150 - page 43
SECTION 1 5: S PECIFICATIONS 37 SECTION 1 5: SPECIFICATIONS 1 5.1 Standard (Models 1 50 - 40 0) UHA(S) Series Dimension Data A B Rear View End View Z 25 1/2" (65 cm) 6 1/2" (17 cm) Gas Supply F G H T op View I E C D 77 Heater must be supported at these points from abov e or below . 19 3/8" (49 cm) Support Center s 4 x 3/8" Capti ...
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Roberts Gorden 150 - page 44
COMB A T ® UHA U NIT H EATE R I NSTALLATION O PERATION AND S ERVICE M ANUAL 38 1 5.2 General T echni cal Data T able (All Models) Model UHA[S] 15 0 UHA[S] 17 5 UHA[S] 20 0 UHA[S] 225 UHA[S] 250 UHA[S] 30 0 UHA[S] 350 UHA[S] 40 0 F ull Load Amps @ 1 15 V A 5.8 5.8 10 . 6 10 . 6 10 . 6 11 . 6 11. 6 11 . 6 Air V olu me CFM 2245 2245 37 1 6 371 6 3716 ...
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Roberts Gorden 150 - page 45
SECTION 1 6: T HE RO BERTS GORDON ® COMB A T ® UHA-S E - 39 SECTION 1 6: THE ROBERTS GORDON ® COMB A T ® UHA -SERIES W ARRANTY ROBER TS-GORDON WILL P A Y FOR : Wit hin 24 months fr om dat e of pur chase by b uyer or 27 months fr om dat e of shipment b y Rober ts-G ordo n (whichev er comes first), r eplacement par ts w ill be pro vided free of c ...
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Roberts Gorden 150 - page 46
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Roberts Gorden 150 - page 47
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Roberts Gorden 150 - page 48
10 ' (3 m) W ARNING © 2007 Roberts-Gordon, LLC www.rg-inc.com Printed in U .S.A. P/N 91040031 Re v B At tach this infor mation to the wall near the R OBERTS GORDON ® heater Read the Installation, Operation and Service Manual thoroughl y befor e installation, operation or service. OPERA TING INS TRUCTIONS 1 . STOP! R ead all safety instructio ...
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