DE DIETRICH MIT-II-E, MIT-II-H, MIT-EP, MIT-HP and QUADROPAC DUP 500 - Manual (Page 17)

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14/04/2010 - 300015090-001-L MIT-II - MIT/P - QUADROPAC DUP 500
8 Maintenance

The installation and maintenance of the appliance must be
carried out by a qualified professional in compliance with
the statutory texts of the codes of conduct in force.

Before working on the appliance, ensure that it is switched
off and safe.

Check the discharge on the compressor condenser for
single phase voltages.

Before working on the cooling circuit, switch off the
appliance and wait a few minutes. Some equipment such
as the compressor and the pipes can reach temperatures
higher than 100°C and high pressures, which may cause
serious burns.
Maintenance operations are important for the following reasons:
- To guarantee optimum performance
- To extend the life of the equipment
- To provide an installation which offers the customer optimum
comfort over time
Take a reading of the installation's operation at each periodic service.
Refer to this reading in the maintenance log and compare it with the
commissioning data. Signal any anomalies.
8.1 Maintenance contract
We recommend taking out a maintenance contract.
Servicing frequency
: At least once a year
Schedule a service in cold periods to check the following points:
- Operation of the defrosting process
- Setting of the thermostats and safety devices
- Thermal output by measuring the temperature difference between
the flow and the return
8.1.1 Operations to be done at each service
„
Preventive monitoring
- Check whether the pump stopped after a safety shutdown (Error
warning light illuminated)
- Dust and clean the external unit on the PAC

Do not pour water on it, use a rag or a sponge.
- Check the run-off in the condensates vats.
- Clean the condensates vats.
- Check the performance of the heat pump
: Temperature control.
- Carry out a visual and aural check on the entire system(normal
noises, panel detached, lagging, traces of water,...)
- Regularly check the concentration of the antifreeze fluid.
„
Maintenance
- Check for leaks on components which guarantee the containment
of refrigerant.
- Check the electrical connections.
- Regulator function check.
- Change all parts and cables judged to be defective.
- Check all screws and nuts (cover, support, etc.)
- Change damaged sections of lagging.
- Paint the damaged parts.
8.2 Fault finding
All work on the cooling circuit must be done by a qualified
professional, according to prevailing codes of practice and safety in
the profession (recovery of the refrigerant, brazing under nitrogen,
etc.)
All brazing work must be done by qualified brazers.
This appliance is fitted with pressurised equipment, including the
refrigeration pipes.
Use only original parts to replace a defective refrigeration
component.
Leak detection - Pressurised tests :
- Never use oxygen or dehumidified air, danger of fire or explosion.
- Use dehydrated nitrogen or a mixture of nitrogen and refrigerant
indicated on the rating plate.