Roberts Gorden CTU 22 TO 115 Servicing 13.1 Servicing Instructions, Burner Maintenance, Flue Fan

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COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 13: SERVICING 13.1 Servicing Instructions

After commissioning, 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.

Installation, service and annual inspection of heater must be done by a contractor qualified

in the installation and service of gas-fired heating equipment.

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 commissioning instructions on Page 24, Section 11 through Page 27, Section 11.9 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 32, Section 15 through Page 34, Section 15.4.

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.

NOTE 3: Inspect all suspended components and hardware. Insure that they are in good condition, properly tightened, and corrosion free.

13.2 Burner Maintenance

1.Open the hinged door and remove the burner compartment cover. See Page 36, Section 16.2.

2.Clean any deposits from the main burner which may have formed in the injectors or venturi of the burner. See Page 36, Section 16.2.

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.

13.3 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(s) and use a small brush or duster to clean the fan blades from each side. Replace fan(s) when done.

13.3.1For CTUB & CTUC Centrifugal Fan Models

CTUB and CTUC models are fitted with thermally protected three speed fans. The number of fans can be found on Page 41, Section 16.9 and the standard air flow for each model can be found on Page 7, Section 4.3.

For CTUC models, the fans may be accessed via the removable panels in the top, bottom and sides of the inlet spigot compartment as required.

Do not operate at higher speeds than the original setting on the heater without prior consultation with Roberts-Gordon.

The "HIGH" speed option is available to give the normal required air flow against higher static pressures and is not intended to be operated free blowing or against low resistance. Use of the fans under these conditions may cause the fan thermal overload to operate and the fan thermostat to cycle. All fans on a heater must be set to operate at the same speed. For Models 50 - 115, they will be switched using a fan relay built into the heater. See Page 40, Section 16.8.2.

13.4 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.

13.5 Gas Control Valve Maintenance

No regular maintenance is required on these devices. To change gas control valves, See Page 35, Step 16.1 and Page 39, Section 16.5.

Do not repair or disassemble on site. Replace faulty gas valves with genuine ROBERTS GORDON® replacement parts.

13.6 Flue Fan

The flue fan should not require maintenance. However, if the air pressure switch is causing burner lockout, then remove the flue fan from the vent box by unscrewing the screw at the outlet flange and the flue fan mounting plate (See Page 38, Section 16.4). Ensure that the fan is free to run and that the fan wheel is clean.

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Contents Immediately call your local gas Supplier after leaving the buildingFollow the gas supplier’s Instructions Supplier, call the Fire DepartmentPage Roberts-Gordon, LLC Page Table of Figures Page Product Approval Heater Safety Installer ResponsibilityClearances to Combustibles Corrosive ChemicalsMinimum Required Installation Clearances Critical Considerations 3.1 Basic InformationVentilation Gas SupplyInstallation Clearances and Clearances to Combustibles Specifications 4.1 Ctua Dimension Data Ctua All ModelsTop View End View Rear ViewDimension Data CTUB, Ctuc and Ctud CTUB, Ctuc and CtudGeneral Technical Data Table Gas rates corrected to standard conditions 1013.25 mbar 15 C Heater Installation 5.1 General HandlingFlue Installation 6.1 Flue Installation Type B22 ApplianceAir Intake Terminal Cover Vertical and Horizontal Flue Termination Type B22 Appliance AIR Supply Optional Heater Configurations Distribution Duct Work for CTUB, Ctuc and Ctud HeatersCtud Heaters GAS Piping ConnectionsOption a Option BWiring and Electrical Information Ctua Wiring Diagram Models 50 HzSite Wiring Site Wiring CTUB/C Wiring Diagram ModelsIgnition Module 230 V 1 Ø 50 HzRUN Ctud Wiring Diagram Models For external fan wiringSite Wiring and Electrical Information Commissioning LouvresElectrical Checks Mechanical ChecksAutomatic Burner Control Box Sequence End ViewCombustion Testing Check Gas RateTurning Off the Heater External Controls Complete the CommissioningInstruction to the User Burner Lockout Reset Button Heater OperationCommon User Controls Thermostat Limit Thermodisc Lighting Instructions To Turn On HeaterSimple Fault Finding Simple Fault Finding Burner FaultsTo Turn the Heater Off Burner Maintenance 13.3 Fan/Motor Assembly MaintenanceHeat Exchanger Maintenance Gas Control Valve MaintenanceConversion Between Gases 14.1 General Burner ConversionGas Valves Conduct Commissioning procedure as shown on Page 24, Section StartTroubleshooting For Automatic Ignition Burner Systems For your safety and optimum heater performanceConduct Commissioning procedure as shown Troubleshooting for Flame Supervision System Troubleshooting for Solenoid ValvesRemoval and Replacement Parts Burner Compartment Burner InjectorsIgnition Electrode and Flame Probe Remove screws securing outlet flange to the flue adapter Pressure Switch RG P/NCtua Axial Fan/Guard/Motor Assembly Fan Removal and ReplacementTo Replace the Fan Assembly Ctub & Ctuc Centrifugal Fan/Guard/Motor AssemblyCentrifugal Fan Orientation Fan DataPage Page Page Some objects can catch fire or explode when placed

CTU 22 TO 115 specifications

The Roberts Gordon CTU 22 TO 115 is a renowned unit heater designed to deliver efficient heating solutions in commercial and industrial settings. Known for its advanced features and robust design, this unit heater is ideal for applications where warmth and comfort are essential, such as warehouses, manufacturing facilities, and large retail spaces.

One of the main features of the CTU 22 TO 115 is its powerful heating capacity. With a range of output capabilities, it can effectively heat large areas, ensuring that employees and equipment remain comfortable during cold weather. The heater's output is adjustable, allowing for tailored heating solutions based on specific operational needs.

This model integrates several innovative technologies to enhance efficiency and performance. The use of advanced combustion technology ensures optimal fuel efficiency, which translates to lower energy costs and reduced environmental impact. The heater is available in both gas and oil configurations, providing versatility to accommodate different fuel sources depending on availability and preference.

In addition to its energy efficiency, the Roberts Gordon CTU features a compact design, making it suitable for installations in tight spaces. Its lightweight construction allows for easy installation and relocation, ensuring that businesses can quickly adapt to changing layout requirements. The unit is equipped with high-quality materials and a durable finish, contributing to its longevity and low maintenance needs.

Safety is a paramount concern in any heating system, and the CTU 22 TO 115 doesn't disappoint. It comes with various safety features, including over-temperature protection, ensuring that it operates securely under all conditions. With automatic shutoff capabilities, the heater provides peace of mind to operators, allowing for unattended operation in more remote settings.

Moreover, the CTU’s quiet operation is a significant advantage, as it minimizes disruption in the workplace, ensuring a comfortable environment for personnel. Its design also facilitates easy access to components for maintenance, thus ensuring that the unit remains operational with minimal downtime.

Overall, the Roberts Gordon CTU 22 TO 115 combines performance, efficiency, and safety features to create a reliable heating solution for diverse industrial applications. Its adaptability to various fuel types and efficient design makes it a popular choice among facility managers looking for dependable heating solutions.
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