IMAC 2000S
Burner Compartment
Fan Compartment
Combustion Chamber - Heat Exchanger
Control Panel
Commissioning the Heater
Burner Compartment
Explanation of various components in the bumer compartment
The burner is located in the lockable burner compartment.
The oil line from the separate fuel tank is connected to the internal oil line by feed through glands in the door. As this connection is inside the heater, it is not possible for a third party to disconnect the oil line. The connection is effected using a tailpiece or an optional snap-tite connector.
All IMAC's have a TIGERLOOP. This means it is possible to use a single fuel line. A fuel filter is located in the fuel line next to the burner.
The filter can be easily removed for cleaning.
Thermobile has also taken the environment into consideration and placed a receptacle at the bottom of the burner compartment to catch any oil that may be leaked during service.
The IMAC 4000 is supplied with a two step burner and fan control as standard. This is available as an optional extra for the 2000 S and 3000.
The door of the burner compartment is filled with a wind-resistant securing device and lock.
A brief description of the different burner components is given below.
A – the fuel circuit
B – the combustion air circuit
C – the ignition system
D – the flame control
A – Fuel circuit
The fuel is drawn in from the external tank using suction. It is important that the suction pipe ends at least 10 cm above the floor of the tank. This will ensure that no sludge or water is sucked up, as this would contaminate the fuel circuit.
The fuel flows from the suction pipe in the direction indicated by an arrow on the filter. By adhering to the specified direction of flow, the fuel contamination will be deposited on the outside of the filter element. As a result, it will be clearly visible when the paper is contaminated and requires cleaning. The filter must be rinsed clean if it becomes black and replaced after approximately 2500 – 3000 litres have been consumes.
The fuel then flows to the pump. A filter is also situated in the pump, behind the pump cover.
The fuel flows through the pump to the magnetic valve and then on to the nozzle. There is a fuel filter in both the magnetic valve and the nozzle. This means that the oil is filtered four times before it reaches the nozzle opening. The following filters have been installed: an inlet oil filter, a pump filter, a magnetic valve filter and an nozzle filter.
B – Combustion air circuit
The fan supplies the air for the combustion. The fan and the pump are driven by the same motor.
The amount of air supplied is dependant on the backpressure. This means that if the burner is dirty it will generate extra backpressure and will therefore receive less combustion air.
If there is insufficient combustion air, the CO2 percentage will become excessive and result in sort formation. This situation can also result in the generation of CO. it is therefore important that both the burner and the nozzle swivel plate are always clean.
It is also important to set the correct amount of combustion air to be able to achieve the correct CO2 levels.
C – Ignition system
The ingnition system is comprised of a transformer and an ignition electrode.
D – Flame control
The flame control is performed using a photoelectric cell in combination with a burner relay.
All heater switching functions are tested using the special, digital Satronic burner relay. The advantage of a digital burner relay is that you can read the data memory.
Fan Compartment
Explanation of the fan compartment
The fan in the IMAC 2000 S draws in the air through a single inlet panel. This fan is a special direct drive, axial ventilator with an high back-pressure.
These fans make it possible to transport large volumes of air over large distances.
Outlet panels are available in 500 and 600 mm.
Details of the fan capacities of our IMAC 2000 S are presented later on in the technical specifications section of this presentation.
Combustion Chamber – Heat exchanger
The combustion chambers and heat exchanger operating principle
The combustion chambers and heat exchangers used in the Thermobile IMACs have been specifically designed for outdoor use.
Thermobile has over 45 years of experience in using steel for heaters and understands as no other how to apply the proper materials.
The combustion chambers operate according to the counter-flow principle. As a result the flue gases remain longer in the combustion chamber and therefore generate additional heat. The heat exchanger was also specifically designed to retain the gases for as long as possible. As a result our heaters have an efficiency of 91% and conform to the strictest xriteria for flue temperature.
It is easy to clean the heat exchanger via the inspection flap. In addition, both the combustion chamber and the heat exchanger can be easily removed from the side.
Control Panel
Explanation of the IMAC 2000S control panel
The switch box in the IMAC series is completely moisture-free and is comprised of a central control panel that contains all the switches and indicator lights.
There is a section switch on the control panel, whereby: 1=heat, 0=off, 2=ventilate.
The 6 green indicator lights (L1, L2 and L3) indicate whether the three phases are live. There are also indicator lights for the control voltage, burner-in and fan-in. The three yellow fault indicator lights indicate faults in the thermostat, burner or fan. There is a reset button below the fault indicator lights. After the fault has been cleared, the system can be reset using this button.
Optionally, the IMAC 2000 S can be provided with two-step controls of burner and fan. The switch box of than includes a frequency controller and extra five (5) step switch for setting the burner to high and low ventilation high and low.
A connection for a separate room thermostat is located on the left of the switch box.
The control panel has a 220 Volt socket to connect a lamp or service equipment.
The control panel has a thermal cut-out, the necessary relays, a soft started that regulates the start of the primary fan (limits the starting current) and a phase reversal relay that regulates the correct direction of rotation.
IMAC electrical connections
Thermobile's IMACs must be connected by a component person to 3*400V & 0-earth of 3*400V, 0& earth.
The IMACs are fitted with a 5-pole socket/connector, type Ceeform 32A 380V.
Commissioning the heater
The burner receives electrical power when the rotary switch is set to ‘1'. The burner relay regulates the completion of the starting program. This program proceeds as follows:
The burner fan starts to rotate and blows any residual gases out of the combustion chamber.
After a short time, the ignition transformer generates a spark across the ignition electrode, and then the magnetic valve is opened. The atomised fuel is mixed with the combustion air to create a combustible mixture, which is ignited by the spark. The photoelectric cell then checks the flame to ensure it is a good (light-producing) flame. If this is the case, the photoelectric cell in combination with the burner relay removes the electrical potential from the ignition transformer.
However, if after a time, the flame in the combustion chamber is extinguished, the burner relay will first shut the magnetic valve and then restart the entire starting process. If there is still no correct flame generation after this repeat procedure, the burner relay will enter into a fault condition.
In such a case, the burner relay can be reset using the illuminated button, after which the procedure can be started again.
After a delay, the combi-thermostat will trun on the primary fan and blow the heated air into the room.
For Further information on our Imac 2000s, or any similar products please contact us.