Electra WMN9 - Maintenance and Servicing Procedures; Identifying Refrigerant Leaks; Condenser Cleaning and Maintenance

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WMT
090914 RC090914 RC
090914 RC090914 RC
090914 RC
High THigh T
High THigh T
High T
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MAINTENANCE AND SERVICING
All the units are factory-filled with a predetermined R407C charge.
R407C is a mixture of three refrigerant fluids: R32 (23%), R125 (25%) and R134a (52%).
As opposed to R22 that is a pure fluid, R407C is a non-azeotropic fluid. One of the
consequences of using R407C is the glide causing temperature variations during the phase
of changing from the liquid to the vapour state.
HOW TO IDENTIFY A REFRIGERANT FLUID LEAK?
There may be a refrigerant leak in the system if the following conditions occur with the two
indoors units in operation:
Overheating higher than 15°C.
Compressor output temperature higher than 105°C.
Under-cooling lower than 3°C.
In the event of a leak:
Identify the source of the leak.
Completely drain the circuit by forcing the opening of the solenoid valves
Repair the cause of the leak.
Charge the circuit with nitrogen at a pressure of 2 bars and pass soapy water over the
pipe work to check that the leak has been properly repaired.
Vacuum drain the circuit down to 10
-
² bars.
Charge with R407C refrigerant as indicated on the Maker’s plate, taking account of
the installation’s pipe lengths.
CONDENSER
It is recommended that the finned exchanger is checked on a regular basis.
Use a neutral pH cleaning product to avoid any corrosion.
The cleaning operation must be performed with a low pressure water jet to avoid damaging
the fins.