(7) Operation start
1. Turn on the operation switch (CNS2) at the bottom of controller.
2. Turn ON the power supply of condensing unit.
3. Turn ON the operation switch of the module controller.
4. When Low pressure value ≥ Reset pressure or Outdoor air temperature < 5°C and Medium pressure value ≤ Reset pressure, the compressor starts. (Refer
to page 10, 4 Flow chart of each movement.)
(8) Check of adequate refrigerant quantity
Calculate the refrigerant quantity according to Instruction manual page 17, 6.4. Refrigerant charge.
Charge the 90% of the calculated amount.
When you confirm that the following operating conditions 1, 2 are met, please add the refrigerant to the 100% of the calculated amount.
1. In the operation at 5 minutes or more after starting the compressor, the subcooling degree (*1) must be 0°C or under.
*1 Subcooling degree = Medium pressure saturation temperature “C46” – “Liquid feed pipe temperature “C15“
Calculated by 7 segment display
C46: Medium pressure saturation temperature C15: Liquid feed pipe temperature
2. The aperture of EEVSC subcooling coil electronic expansion valve must be at the upper limit value.
Type
Upper limit value (pulse) of subcooling coil electronic expansion valve 7 segment display “C23”
OP-UPAC015COP04E
470
(9). Oil check verification
Charge condensing unit oil according to “Instruction manual page 13, 6.1. Charge of condensing unit oil”.
Check if adequate quantity of oil is retained, by the following refrigerating oil check operations.
<Operation>
1. Change the setting of compressor speed at 90 rps using 7-segment display “P19”. (For the detail of setting, see Explanation of control on instruction
manual page 25.)
2. Operate all load units to be connected (show case and unit cooler).
3. Change the dipswitch SW4-6 OFF
→
ON.
4. Operate the unit for 180 minutes in total with the compressor running at 90 rps. Elapsed operating time of compressor (90rps) is indicated at 7-segment
display. (The compressor may stop during operation depending on the condition of load unit.)
5. Should the operation of total 180 minutes be counted up without detecting by the oil level sensor any oil shortage (detection of oil shortage for 30
seconds continuously), “7-segment display” changes to “0”. In this case, it is complete the oil quantity check.
When “7-segment display” has shown “Lo1” in place of “0”, the operation is stopped because an oil shortage has been detected. In this case, turn the
dipswitch SW-6 to OFF and replenish the oil.
(Quantity of oil to be added at one time should be 500 cc as a guide.) After replenishing the oil, repeat from (1), 2 to check operation till “7-segment
display” shows “0”.
(10) Oil return operation
When the external input harness is inserted into the external input “CN3 ” of the control board while the compressor is in operation and the rotational
speed is less than 70 rps, the oil return control is immediately executed.
In the maintenance PC of the condensing unit, the compressor rotation speed CM1, the suction superheat degree, the indoor unit expansion valve
opening degree, and the oil return control status are selected, and whether the expansion valve opening degree is opened by the oil return or not, the oil
return control is normally completed (10 minutes end or end in time due to low overheat), and the oil return control status is confirmed.
(11) Operation check of protective device
Confirm that, if a protective device trips, an alarm is released and the unit stops by the error stop.
Out of various protective devices for the condensing unit, confirm here, as a representative example, if the error stop occurs when the thermistor error
is raised forcibly.
1. Disconnect CNTH1 connector (Gas cooler temperature Tho-G1, G2 thermistor).
2. Turn on the power supply. (It can be confirmed for 20 seconds only at 10 minutes after starting operation.)
3. Confirm that it stops approx. 5 seconds later. (Alarm code “E-37” is displayed.)
4. Reinsert the removed CNTH1 connector as it was.
5. Reset the alarm code as follows.
• Pressing SW8, SW9, change the 7-segment display to “P20”, and press SW7 for 3 seconds or more.
• Change from “0” to “1” with SW8.
The alarm code is reset.
If the external input P08 (CNS3) is set at “3: Error reset”, it can be reset also externally. Make sure, however, to check the error code and remove the
cause of error, before resetting.
6. Confirm that the operation restarts. (Alarm code “E-37” extinguishes.)
7. Referring to instruction maual page 29, Alarm history display mode, clear the history of alarm code “E-37” which has been displayed and saved.
8. By the low pressure cut or turning “OFF” the breaker, end the operation confirmation (stop of condensing unit).
User Guide | Optyma™ iCO2
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
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