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• Make sure all electric connections are tightened.
• Make sure all fan screws are tightened.
• Make sure heat exchanger mounting is level and stable.
• Make sure all of the defrost heaters are working properly.
• Because of the high humidity of the ambient air high icing formation may be seen during the
first start-up. For this reason check icing formation if it occurs.
• Observe defrost cycle.
• Make sure that the system is evacuated well from air. There should not be air pockets
inside of the coil.
• Cables should not be affected by heat of resistance.
• Check the defrost process. Defrost time can be extended if it is not enough to melt all of the
ice.
• The coil heater is extremely hot. Do not touch without gloves. Be wary of any material
splashing and wear protective goggles.
• Fans, cables, etc. in case of fire shut off electricity immediately. Use a fire extinguisher
suitable for electrical materials.
Products for spare parts, please contact Marstair. Any spare parts taken from other companies,
Marstair will not be responsible in case of any damage and will be out of warranty.
• Please ensure that all maintenance work is done by authorised persons.
• Regular inspection and periodic maintenance is enough to ensure long time usage.
• Make sure drainage water easily flows away. Please see water flows away easily with
opening drain pan and side cover.
• Commercial leakage detector can be used in detecting leakages.
• Make sure each fan is running freely.
• Visually inspect all of the electrical wiring connections.
• Observe ice formation and examine defrost cycle.
• Gas circulation must be stopped during maintenance.
6.1
Changing Defrost Heaters
• Electric defrost heaters come in two configurations. One is for light ice formation between 0º
C and 5º C temperatures and the other one is for heavy ice formation below 0º C temperatures.
• Before anything is done make sure electric power is off
• Open the terminal box.
• Make sure that heating elements are not extremely hot.
• Disassemble coil heating elements by removing retaining rings and change them with
new ones.
Figure 6.1.1 Disassembling coil resistances
12
56808001-02
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