Roberts Gorden DAT90, DAT75, DAT100, DAT115 service manual GAS Piping, Connections

Page 21

SECTION 9: GAS PIPING

SECTION 9: GAS PIPING

WARNING

Fire Hazard

Connect gas supply according to Figure 11.

Gas can leak if not installed properly.

Failure to follow these instructions can result in death, injury or property damage.

It is important that the gas supply pipe and the electrical connections do not 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. Pipe work from the meter to the heater(s) must be of adequate size.

9.1 Connections

Connect the heater to the gas supply ensuring that the final connections are as follows:

The gas supply pipe is adequately sized to carry the total volume of gas for the complete installation.

An isolating valve and union connection should be used and fitted into the supply adjacent to the heater.

For suspended heaters, use an approved metal flexible connection between the isolating valve and the heater. 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.

Figure 11: Gas Connection with Stainless Steel Flex Connector

Hold gas nipple securely with pipe wrench when attaching the flex gas connector.

Do not twist flexible gas connector.

Option A:

Stainless Steel

Flex Gas

Connector

Ensure all joints are gas tight.

Option B:

Gas Isolating Valve Medium or Heavy Guage Tubing Gas Connection

Union

Drip Leg

Cap

Connection

 

Do not bend flexible gas connector sharply.

15

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Contents DualAir Page Roberts-Gordon, LLC Page Table of Figures Page Product Approval Installer Responsibility Heater SafetyClearances to Combustibles Corrosive ChemicalsCritical Considerations 3.1 Basic Information Minimum Required Installation ClearancesLocation and Suspension All models VentilationInstallation Clearances and Clearances to Combustibles Front View Left Version Specifications 4.1 DATModel 100 115 Fan Data General Technical Data TableModel 100 115 2 DAT100 and 115 4 kW motor Heater Installation 5.1 General HandlingShelf Mounting and Suspension Type B22 Appliance Flue Installation 6.1 Flue InstallationAir Intake Terminal Cover Flue ConversionControl Section & Upper Panel Vertical and Horizontal Flue Termination Type B22 Appliance Open Flued Installation Room Sealed InstallationAIR Supply Building VentilationDepartment for recommendations regarding Optional Heater Configurations 8.1 Distribution DuctDuct resistance and design. Tel +44 0 121 7700Connections GAS PipingRemote Control Wiring and Electrical InformationSee Page 17, .3 through Page 18, Section ModelsNumber See Page 20, Section DAT Wiring DiagramSite wiring connections shown DAT Site Connections at Main Circuit Board Commissioning Automatic Burner Control Box Sequence Commissioning the Gas Valves Combustion TestingCommissioning the Gas Valve Set Minimum PressureTurning Off the DualAir Unit Pressure SwitchComplete the Commissioning Instruction to the UserCommon User Controls Combination Fan/Limit Thermostat Heater OperationSee Page 7, .3 and Page 8, Figure Secondary Limit ThermostatSimple Fault Finding Burner Lockout Reset ButtonSimple Fault Finding burner faults Cooling Section OperationIf you smell gas 13.3 Fan/Motor Assembly Maintenance Burner MaintenanceHeat Exchanger Maintenance Servicing 13.1 Servicing InstructionsGas Control Valve Maintenance Conversion Between Gases 14.1 General Burner ConversionGas Valves Conduct Commissioning procedure as shown on Page 21, Section Result in death or electrical shock Troubleshooting For Automatic Ignition Burner SystemsStart Troubleshooting for Flame Supervision SystemTroubleshooting for Main Fan Troubleshooting for Solenoid ValvesConduct Commissioning procedure as on Page 21, Section Troubleshooting for Fan ContactorGas Valve Replacement all models Removal and Replacement PartsBurner Components Gas ValveBurner Injectors Burner CompartmentIgnition Electrode and Flame Probe Remove screws securing outlet flange to the flue adapter See Page 21, Section Heater Pressure SwitchPressure Switches Coil Pressure SwitchFilter Pressure Switch Ignition Control 16.7.1 S4563CFan Motor Removal Fan Removal and Replacement BREAK-OFF Link Must be Removed Page Some objects can catch fire or explode when placed
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