Roberts Gorden CTCU 7 Check Gas Rate, Combustion Testing, Pressure Switch, Turning Off the Heater

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SECTION 10: COMMISSIONING

10.2.2Commissioning the Gas Valve (All Gases) 10.2.2.1 Check Burner Gas Pressure

1. Loosen the screw cover of the outlet (burner) pressure test point and connect 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 Tech- nical Data Tables for the correct gas and model on Page 6, Section 4.3.

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 6, Section 4.3 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.

2.Remove the manometer and refit all covers to the valve and tighten the screw of the outlet pressure tap.

3.Check gas flow rate at gas meter.

10.2.3 Combustion Testing

The only adjustment to alter combustion performance is burner pressure. Combustion quality must be tested to prove correct heater operation. Incorrect results will indicate faults with the installation or appliance.

Combustion testing must be carried out with all covers in place. The flue gas is sampled in the flue, within 1 meter of the heater. The values of CO2 should be between 5.7% to 8.0% for natural gas and 6.8% to 9.2% for LPG dependant upon model.

The CO will be up to 80 ppm (0.008%) dry, air free dependant upon model. Temperature rise of the flue gases above ambient should be approximately 130° C to 160° C. Seal test hole in flue after testing.

10.2.4 Pressure Switch

The pressure switch is factory pre-set for each model and is not adjustable.

10.2.5 Turning Off the Heater

Set the external controls to the "OFF" position and the main burner will stop.

The fan will run until it is stopped automatically by the fan thermostat.

Do not use Electrical Isolator for control of heater. Electrical Isolator will switch off the fan. Heat exchanger could be damaged. Warranty will not cover damage to the heat exchanger if operated improperly.

10.2.6 External Controls

External Controls may include time switch, room thermostat and frost thermostat. Operate each control to ensure that they function correctly. Set the time switch (if fitted) and room thermostat to the users’ requirements.

10.3 Complete the Commissioning

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 18, Section 11 through Page 19, Section 11.5 and all warnings defined in this manual.

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Contents Mbat Page Roberts-Gordon, LLC Page Table of Figures Page Product Approval Corrosive Chemicals Heater SafetyInstaller Responsibility Clearances to CombustiblesVentilation Minimum Required Installation ClearancesCritical Considerations 3.1 Basic Information FlueInstallation Clearances and Clearances to Combustibles Dimension Data Ctcua All Models Specifications 4.1 Ctcua All ModelsCTCU-7 CTCU-11 CTCU-15 CTCU-22 General Technical Data Table All ModelsShelf Mounting and Suspension Heater Installation 5.1 GeneralShelf Mounting and Hanging Suspension Type B22 Appliance Flue InstallationFlue Installation Changing Flue and Air Intake OrientationVertical and Horizontal Flue Termination Type B22 Appliance AIR Supply Room Sealed InstallationOpen Flued Installation Heaters Installed Within the Heated SpaceConnections GAS PipingRemote Fan Controls Wiring and Electrical InformationRemote Controls Burner Controls ThermostatCtcua Wiring Diagram Models 7 Site WiringBegin Commissioning Before Operating the Heater CommissioningLouvres Mechanical ChecksAutomatic Burner Control Box Sequence Turning Off the Heater Combustion TestingPressure Switch Check Gas RateLimit Thermostat Burner Lockout Reset ButtonHeater Operation Common User Controls 11.3.1 Fan ThermostatTo Turn the Heater Off Simple Fault FindingSimple Fault Finding Burner Faults Gas Control Valve Maintenance Burner Maintenance12.3 Fan/Motor Assembly Maintenance Heat Exchanger MaintenanceGas Valves Conversion Between Gases 13.1 GeneralBurner Conversion Conduct Commissioning procedure as shown on Page 15, Section Turn on controls Troubleshooting For Automatic Ignition Burner SystemsStart Troubleshooting for Flame Supervision SystemTroubleshooting for Main Fan Troubleshooting for Solenoid ValvesGas Valve Removal and Replacement PartsBurner Components Burner Injectors Burner CompartmentIgnition Electrode and Flame Probe Flue Fan Vertical Installation 041 To Replace the Fan Assembly Ctcua Axial Fan/Guard/Motor AssemblyFan Removal and Replacement Fan and Limit Thermostats 15.8.1 Removal and ReplacementPage Page Some objects can catch fire or explode when placed
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CTCU 7, CTCU 22, CTCU 11, CTCU 15, CTCU specifications

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