Operating Check List - Panasonic 140 Installation And Maintenance Manual

14.2. Operating check list

14.2.1. General
Check for any unusual noises or vibration in the running components.
14.2.2. Phase rotation protection
If there is an issue with the electrical supply phases, the phase rotation protection device will prevent the machine from
starting.
14.2.3. Electrical
14.2.3.1. Set points
1. Compressors circuit breaker settings.
2. Pump Circuit Breaker and Fan Circuit breaker settings.
NOTE: The outdoor fan motor is equipped with an internal safety device with automatic reset.
14.2.3.2. Operating voltage:
Recheck voltage at unit supply terminals.
14.2.3.3. Control
1. Verify that on/off switch and pump 1/2 switch works perfectly.
2. Check unit is wired for correct control of unit fan, cooling and heating modes.
3. Verify all sensor values available with the controller display.
14.2.4. Compressor and refrigeration system
1. Running check: Start the compressor. Check for any unusual noise or vibration.
2. Operating Pressures: Operate the unit for at least 20 minutes and ensure that the refrigerant pressures are stabilised, and
check that they are within the normal operating range.
3. Operating Temperature: Check discharge, suction and liquid temperatures.
4. Discharge temperature on cooling cycle should normally not exceed 115°C.
5. Suction superheat should be 6K ±2K.
14.2.5. Hydraulic circuit
1. Check the fi lter's cleanliness
2. Check the presence and position of the stop valves to isolate the unit during maintenance periods
3. Adjust the water fl ow to specifi cations. (see graphs appended).
- Check pressure at the inlet and outlet of the plate exchanger
- Determine the water fl ow using a fl owmeter or the load loss of the plate exchanger
4. Check the installation is protected against frost (heat insulation, glycol ethylene percentage of the unit if its presence is
necessary...)
5. Check that the bleeder present in the unit has actually been opened.
The unit must work with a water fl ow rate in agreement with recommended values displayed in the tablein § "Physical
characteristics", page 11. Running the unit with a low water fl ow is dangerous, as it could result in irrevocable damage to the
components as well as to the plate exchanger. If the unit is run with insuffi cient fl ow, performance will not be optimised.
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