Roberts Gorden UHA[X][S] 60 Vertical Venting, Length Requirements, Maximum Vent Lengths

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6.6 Vertical Venting

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.

Approved Carbon Monoxide Detectors: Each carbon monoxide detector as required in accordance with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified. Signage: A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, “GAS

VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.

Inspection: The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4.

6.6 Vertical Venting

Vertically vented heaters can be common vented (up to four heaters).

For vent lengths greater than 5' (1.5 m), condensation will form. Insulation is recommended and condensation drains may be desired. Venting through the top of the heater cabinet is not recommended if vent lengths are longer than 10' (3 m). In this case, vent from the rear of the heater cabinet then run the vent vertically and use a condensate drain at the bottom of the vertical vent. Vent pipe must be sloped 1/4'' (.6 cm) for every 1' (.3 m).

For 4'' (10 cm), an approved vent cap (P/N 90502102) must be used.

For 6'' (15 cm) common vent, an approved vent cap (P/N 90502103) must be used.

For common vertical venting of more than two heaters, See Page 18, Figure 11.

A vent shall not extend less than 2' (.6m) above the highest point where it passes through a flat roof of a building.

6.7 Length Requirements

If using vent lengths greater than 5' (1.5 m), condensation will form in the vent pipe. Insulation and additional sealing measures (high temperature 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).

6.7.1 Maximum Vent Lengths

Model UHA[X][S]

Model UHA[X][S]

Number of Elbows

30 - 60

75 - 125

 

 

 

 

25 ft (7.6 m)

40 ft (12.2 m)

1

20 ft (6.1 m)

35 ft (10.7 m)

2

15 ft (4.6 m)

30 ft (9.1 m)

3

10 ft (3.0 m)

25 ft (7.6 m)

4

5 ft (1.5 m)

20 ft (6.1 m)

5

6.8 Vent Material

Vent material may be single wall 26 ga. (minimum) galvanized steel or equal thickness stainless steel. Completely seal all joints, refer to Page 14, Section 6.3.

If penetrating a combustible wall or roof, a listed thimble with 2" (5 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 manufacturer's clearance from vent material is maintained. Seal annular space of the type B-1 vent as well as all joints in the remaining vent.

6.9Replacing an Existing Heater in a Venting System

When replacing an existing heater in a venting system, the venting system may not be properly sized to vent the new heater. The following steps must be followed with each appliance connected to the venting system placed in operation, while any other appliances connected to the venting system are not in operation.

1.Seal any unused openings in the venting system.

2.Inspect the venting system for proper size and horizontal pitch, as required by the NFPA 54/ ANSI Z223.1 - latest revision, National Fuel Gas Code (US) or Standard CSA B149.1 Natural Gas and Propane Installation Code (Canada) and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.

3.Close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system

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Contents UHA-Series Tubular Unit Heaters Low Profile Range Installation, Operation & Service ManualCombat Models UHAXS 30, 45, 60, 75, 100,Page 2008 Roberts-GordonLLC TABLE OF CONTENTSPrinted in U.S.A Page TABLE OF FIGURES Page 1.1 Manpower Requirements SECTION 1: HEATER SAFETY1.2 Safety Labels and Their Placement Figure 1: UHA 30 - 45 Label Placement For separated combustion units onlyFigure 2: UHA 60 - 75 Label Placement For separated combustion units onlyFigure 3: UHA 100 - 125 Label Placement For separated combustion units only2.2 Corrosive Chemicals SECTION 2: INSTALLER RESPONSIBILITY2.1 Wall Tag 2.3 National Standards and Applicable Codes3.5 Clearances to Combustibles 3.4 Minimum Required Installation Clearances3.2 Manufactured Units 3.6 Ventilation3.8 Electrical Supply 3.7 Gas Supply3.9 Vent 4.3 Parking Structures and Repair Garages 4.1 Gas Codes4.2 Aircraft Hangars 4.4 Electrical4.6 High Altitude 5.3 Wall Mounting SECTION 5: MAJOR COMPONENTS 5.1 General5.2 Shelf Mounting and Suspension Crush Hazard Use 3/8 threaded rod minimumFigure 6: Shelf-MountingMethods Figure 5: Suspension MethodsExisting cabinet screws must be re-used Wall Shelf Mounting Bracket Kit DescriptionPart Number Descriptionlouver and compress Figure 8: Vertical Louvers OptionalPush in spring to remove6.1 Changing Vent and Air Intake Orientation 6.3 Vent InstallationSECTION 6 VENTING 6.2 Venting6.4 Unvented Operation 6.3.1Standard Vented Heaters Models UHAX 30 -6.5 Horizontal Venting 6.7.1 Maximum Vent Lengths 6.6 Vertical Venting6.7 Length Requirements 6.8 Vent MaterialHorizontal Figure 9: Vent and Roof DetailVertical OptionPage Horizontal Figure 13: Concentric Vent BoxVertical Option OptionVent Terminal SECTION 7 AIR SUPPLY 7.1 Separated Combustion Installation7.2 Unvented Installation 7.3 Building Ventilation8.1 Connections SECTION 8: GAS PIPINGFigure 15: Gas Connection 9.1.1 Fan Control SECTION 9: WIRING9.1 Positioning Thermostats 9.2 Low Voltage Thermostat with One HeaterRelay Part Number ModelRelay Type UHAXS 30 -90436300 UHAXS 60 -DPST Max. Number of Heaters9.5 Internal Wiring Diagram 9.6 Ladder Wiring Diagram 9.7 Electrical Connection to the Heater 10.1.1 Louvers SECTION 10: OPERATION AND MAINTENANCE10.1 Pre-Start-UpChecks 10.1.2 Electrical ChecksRequired Incoming Signals Figure 16: Automatic Burner Control SequenceFigure 17: Gas Valve for Models UHAXS 30 - Signals Output By ControlCheck Gas Rate 10.2.3 Pressure SwitchFigure 18: Gas Valve for Models UHAXS 60 - 10.2.4 Turning Off the Heater10.3 Complete Start-Up 10.2.5 External Controls10.3.1 Instruction to the User SECTION 11: USER INSTRUCTIONS Reset Limit Switch - See Page 33, SectionFigure 19: Manual Reset Limit Switch 11.1 User InstructionsFigure 20: LED Diagnostic Codes 11.5 Simple Troubleshooting11.5.1 Simple Troubleshooting Burner Faults 11.4.2 To Turn the Heater Off12.4 Heat Exchanger Maintenance 12.2 Burner Maintenance12.3 Fan/Motor Assembly Maintenance 12.5 Gas Valve MaintenanceThe Vicinity of the Heater 12.8 Maintenance Checklist12.7 Venting and Air Intake Pipe See Page 6, SectionPipe when installedCombustion Air Intake Heat ExchangerSECTION 13: TROUBLESHOOTING 13.1 General STARTSECTION 13: TROUBLESHOOTING 13.3 Troubleshooting for Flame Supervision System Correct power 13.4Troubleshooting for Gas Valves13.5Troubleshooting for Flue Blower STARTBurner Components SECTION 14 REPLACEMENT PARTS14.1 Gas Valve 14.2 Burner Compartment 14.2.1 Burner Injectors14.3 Ignition Electrode and Flame Probe Install Vertical screws 14.4 Heat Exchanger14.5 Louver and Louver Springs Horizontal14.6 Flue Blower Vertical Installation 14.9 Axial Fan/Guard/Motor Assembly 14.7 Pressure Switch14.8 Ignition Control 14.10 Limit Switches 14.9.1 Fan Removal and Replacement14.9.2 To Replace the Fan Assembly 14.10.1 Removal and ReplacementSIDE VIEW SECTION 15: SPECIFICATIONS 15.1 Dimension DataTOP VIEW REAR VIEW15.2 General Technical Data Table All Models 15.3 Technical Data Table All ModelsROBERTS GORDON WILL NOT PAY FOR WARRANTY IS VOID IFROBERTS GORDON WILL PAY FOR Roberts-GordonPage Purchased From if different than installer OWNER WARRANTY REGISTRATION CARDAbout the Installer Type of Installation check onePage Page close to heater Installation ClearancesFire Hazard injury or property damage