User manual DESA MASTER GREEN 200

[. . . ] There are three safety devices which are activated in case of serious malfunction. The Burner Control Device, which is mounted on the burner and has a restart button, automatically stops the burner if the flame goes out. The Overhrat Thermostat, L2, of the manuel restart type, is activated if the temperature of the combustion chamber rises above the set maximum limit; the warning light (9) lights up and the heater stops working. The Thermal Relay, RM, is activated if the fan motor starts to use more electrical current than the maximum permitted limit; the warning light (10) lights up and the heater stops working. [. . . ] Having completed all these operations check carefully that all electrical connections correspond to the wiring diagram. When the heateris first turned on you must check that the fan does not use more current than the maximum permitted limit. CONNECTION TO HOT AIR DUCTS The space heater provides heat by releasing and dispersing hot air. An air head is supplied with each unit and it can be connected to new air ducts if the user wishes to satisfy specific needs. In this case and in particular if the diameter and length of the ducts have been changed or if the number of bends has been modified, air output may vary. Consequently it is very important to check and regulate air output when any modification is made to air heads or air ducts. in all circumstances you must ensure that: · The fan motor does not absorb more current than the maximum permitted limit; · the volume of air flow corresponds to the recommended level. If the heater is equipped with centrifugal fan and if the volume of hot air differs from preset values proceed as follows (Fig. 1): 1) Remove the aspiration grill which is on fan motor side of the unit; 2) Remove the screws (2) from the motor slide. 3) Remove the belt (1); 4) Loosen the bolts (3); 5) Turn the pulley clockwise and anti-clockwise in order to increase or reduce the volume of air; 6) Tighten the bolts (3); 7) Put back the aspirations grill; 8) Repeat operations (1) -(7) until the correct volume of air flowhas been achieved. The gas used to predispose the heater at factory has been declared on data plates applied on the box and on the heater it self (methane, G20, or L. Repeat regulation of combustion while composition of combustion waste products are checked. Correct data plate on the heater writing which type of gas must be used. REGULATION OF COMBUSTION - I°OPERATION After having checked the hermetic seal of line and of combustion waste products line, heater may be operated for the first time. To perform regulation of combustion correctly, combustion waste products must be analyzed using appropriate instruments: values recommended by actual standards must be reached. Adjustments to be carried out are described in the Burner Instruction Manual; final values of CO2 shall be correspondant to excess air factor of 1, 2 (12, 5% for gas-oil, 9, 7% for G20, 9, 6% for G25, 11, 7% for G30 and 11, 7% for G31) while CO level shall be less than 75 ppm. The unit must be connected to the chimney flue in accordance with current legal regulations and in line with the following guidelines: · The tube which carries the smoke should cover as short a distance as possible and should slant upwards; · There should be no sharp bends in the tubes and the diameter of the tubes must never be reduced; · Every heater must have its own chimney; · Flue draft must at least correspond to the minimum compulsory level in the Technical Specifications. ANALYSIS OF COMBUSTION WASTE PRODUCTS The probes which check the composition of combustion waste products and smoke temperature must be positioned as indicated in Fig. When these tests have been completed the hole which was drilled for the probe must be sealed with a material which is resistant to high temperatures and which ensures that the tube remains airtight. The burner starts up, the combustion chamber heats up and then the fan starts; · If the unit operates automatically set the room thermostat at the desired level and turn the control knob (2) to : the heater will now start and stop automatically. [. . . ] CLEANING THE BURNER For the heater to work efficiently the burner must be serviced regularly by an Authorized Service Technician. All cleaning, servicing and regulation operations must be carried out as indicated in the Burner Instruction Manual. In both cases check carefully in the Technical Specifications that all parts of the heater can take the strain of lifting. Turn it off as indicated above · disconnect electricity by pulling out the plug · Wait until the heater cools down The heater has four hooking points at the four top corners. [. . . ]