COMBAT® CTCU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL

12.3.2 Limit Thermostat

The limit thermostat is located inside the access door of the heater. See Page 38, Section 16.3. This control protects the heat exchanger against overheating.

Press to reset

These are hand reset devices to give further protection against fan failure.

NOTE: To reset, the heat exchanger must be cool.

Description

Part Number

Limit Thermostat

90412100

12.3.3 Burner Lockout Reset Button

The red warning light at the front of the heater will illuminate when the control has gone to lockout. This may be caused by flame failure. Press the reset button on the back of the heater, (See Page 8, Section 5.1), or the remote reset if installed on site. If control locks out, do not make more than three attempts to restart the heater. Dangerous fuel mixtures can build up. The fault must be traced and repaired by a registered installer or service engineer.

12.4Lighting Instructions 12.4.1 To Turn On Heater

1. Ensure that the electrical and gas supplies to the heater are on. Check that the on site controls are “ON”.

NOTE: The thermostat setting must be above the ambient temperature for the heater to operate.

2. The automatic firing sequence will begin as described on Page 22, Figure 11. The heater will now operate automatically under the control of the on site controls. Following long shut down periods, the control may go to lockout. See Page 26, Section 12.3.3.

12.4.2 To Turn the Heater Off

Set the installed remote controls to the “OFF” position.

The burner will turn off immediately.

The fan will continue to run for a few minutes. To restart, turn the control used above to “ON”.

12.5 Simple Fault Finding

Some possible reasons for the heater not operating are:

1.Gas supply not turned “ON”.

2.Electricity supply not turned “ON”. 26 of 42

3.The time and/or temperature controls are not “ON”.

4.The thermostat limit thermodisc may have operated. This may be caused by an interrup- tion of the electrical supply or failure of the distribution fan.

If the thermostat limit thermodisc persistently operates, there is a fault which must be investigated by a contractor qualified in the installation and service of gas-fired heating equipment.

12.5.1 Simple Fault Finding (Burner Faults)

If the burner fails to ignite for any reason, it will go to lockout. This will be indicated by the red light on the heater or at the remote indicator (if fitted).

1.Press in and release the lockout reset button. If a remote reset is not fitted, a reset button is on the rear panel of the heater.

See Page 8, Section 5.1.

Lockout should not occur during normal operation of the heater and indicates there is a fault condition which must be corrected.

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Roberts Gorden CTCU 11 Limit Thermostat, Burner Lockout Reset Button, Lighting Instructions 12.4.1 To Turn On Heater
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CTCU 32, CTCU 7, CTCU 22, CTCU 11, CTCU 15 specifications

Roberts Gorden offers a diverse range of high-performance make-up air units known as the CTCU series, which includes models CTCU 22, CTCU 15, CTCU 7, CTCU 27, and CTCU 11. Each model is designed to deliver efficient and reliable air management solutions for various industrial and commercial applications.

The CTCU 22 is renowned for its robust construction and powerful performance, providing exceptional air flow rates that can accommodate larger facilities. It features a high-efficiency heat exchanger and a multi-stage filtration system that ensures optimal indoor air quality while reducing energy consumption. This model is particularly beneficial for environments requiring high volumes of tempered air, making it ideal for manufacturing plants and warehouses.

CTCU 15, on the other hand, is slightly smaller yet offers remarkable versatility. With an integrated control system, it can easily adapt to changing operational demands, making it a preferred choice for businesses that experience variable occupancy levels. Its quiet operation minimizes workplace noise, and its energy-efficient design significantly cuts operational costs.

CTCU 7 is specifically engineered for smaller spaces without compromising performance. This unit features compact dimensions while still delivering adequate air flow for localized heating and ventilation needs. The advanced temperature control algorithms allow for precise adjustments, ensuring a comfortable environment even in tight areas.

CTCU 27 stands out with its advanced technology that includes integrated smart controls. This model offers real-time monitoring and data analytics to optimize performance and enhance energy efficiency. Its ability to connect with existing building management systems makes it an appealing choice for modern facilities aiming to improve sustainability initiatives.

The CTCU 11 is characterized by its user-friendly interface and maintenance accessibility. It is built with durable materials that extend its lifespan, ensuring long-term reliability. This unit is ideal for applications where regular maintenance is challenging, as its design allows for easy access to all critical components.

In summary, Roberts Gorden's CTCU series encompasses a range of units catered to various industrial needs. With features focusing on efficiency, flexibility, and user-friendliness, these models deliver high-quality air management solutions to improve indoor environments while reducing energy consumption.
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