First time start-up
About this task:
Note: During the commissioning period, ensure there is sufficient heat load to run the unit
under stable full load operation to enable the unit controls and system operation to be set up
correctly and a commissioning log taken.
Read the following section in conjunction with Unit operation, and complete the following steps:
1. Emergency stop: Remove the protective plate from the control panel before commissioning.
See Figure 17.
2. Interlocks: Verify that liquid is flowing through the heat exchanger and that heat load is
present. Ensure that any remote run interlocks are in the run position and that the run schedule
requires the unit to run or is overridden.
3. Start-up: On the HMI, set the unit switch to the ON position to start the unit. There may be a
few minutes delay before the first compressor starts because of the anti-recycle timer. If any
unusual noises or other adverse conditions develop when each compressor starts, be ready
to switch the unit off immediately. Refer to Unit operating sequence for the normal operating
sequence from start-up.
4. System operation: Check the system pressures and temperatures.
5. General operation: After completing the above checks for System 1, repeat the process for
all other systems. In addition, check that loading occurs as specified in Technical data and that
general operation is correct.
CAUTION
Units equipped with factory-fitted hydro kits are shipped with the following settings on the
pump VSD. All other settings are default.
Operation Mode is set to Δp-v
Pump Head is set to H = 30 m.
Customers can adjust the pump setting according to application requirements in field. Refer
to the pump guide for more information.
Special items required for vacuuming and refrigerant charging
As standard, the refrigerant for these units is charged in factory. If the units are delivered without
R-454B and charged with Nitrogen instead, the following items are necessary to complete an onsite
refrigerant charge:
• Nitrogen chart
• Leak detector
• ATEX vacuum pump
• ATEX ventilation fan
• Antistatic gloves
• Warning sign to indicate no ignition sources in the area
YMAE Air-Cooled Inverter Scroll Chiller and Heat Pump74
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