Commissioning; Preliminary Inspections; First Start-Up Or Restart After Long; Shut-Down - Trane LIFT 162-P-1204-P Installation Operation & Maintenance

6. Commissioning

6.1

Preliminary inspections

6.2 First start-up or restart after long inactivity
6.3

Shut-down

6.4 Flow rate calibration
6.1 Preliminary inspections
6.1.1 Electrical
• Verify that the voltage on terminals L1, L2 and L3 is that shown on the plate of the unit
(tolerance allowed) ±5%, which can be checked with a tester. If voltage changes occur
frequently, please contact our technical department to choose suitable protections.
• Verify the complete tightness of the fuse holder caps.
• Verify that the crankcase heaters (if applicable) are powered correctly: to check whether the
heaters are working properly, check that the bottom of the compressor is at a temperature of
10 to 15 °C higher than the ambient temperature.
• Power and check the correct direction of rotation for the three-phase version, which should be
clockwise looking at the motor from the fan side. Otherwise, invert any two of the phase
conductors.
6.1.2 Hydraulic
• Make sure that the water circuit has been previously cleaned: it is recommended to wash the
water circuit via by-passing the unit and then check the cleanliness of the system filter.
• The machines are shipped with open vents and drains, which must be closed during
installation when filling the water circuit. Labels indicate their positions.
• In models with a hydronic kit, the water drain cap of the pump has been removed, in order to
drain the water contained in it and to avoid freezing problems during the winter season. The
cap is inside the envelope containing all documents of the unit.
• Make sure that the hydraulic system has been bled, thereby eliminating any residual air. The
operation must be performed by loading gradually and opening the venting devices set up by
the installer in the upper part of the system.
• If you are using glycol water you can move the antifreeze set-point. The value must be equal
to the value of the freezing temperature of the fluid plus 6K.
6.1.3 Cooling
• Make sure that the pressure gauges (when present) indicate an adequate pressure. Pressure
gauges can be fitted with shut-off valves. They should only be opened when necessary and
once readings are taken, they must be closed again.
• Check that there is no refrigerant leak, possibly using a leak detector.
6.2 First start-up or restart after long inactivity
6.2.1 Start-up
Activate the machine according to that described in the relative command section.
6.2.1.1 Checks during operation
• Check that the machine does not generate abnormal noise or excessive vibrations.
• After a few hours of operation verify that the crown of the liquid and humidity indicator
indicates a dry circuit.
• Verify that the machine operates within the optimum working range.
• Verify that there is no excessive presence of bubbles in the liquid indicator. If there are this
indicates low refrigerant.
• A few minutes after starting the compressors, during the summer operating cycle, make sure
that the condensation temperature is> 5 ± 2K with respect to the condenser outlet water
temperature and that the evaporation temperature is 5 ± 2K lower than the evaporator outlet
water temperature.
• Verify that the overheating temperature of the refrigerant is between 5 and 7K. To verify:
- Measure the temperature with a contact thermometer placed on the intake pipe of the
condenser .
- Read the temperature indicated on the pressure gauge connected to the inlet.
- The difference between these temperatures provides the overheating value.
• Verify that the subcooling temperature of the refrigerant is between 4 and 8K. To verify:
- Measure the temperature with a contact thermometer placed on the outlet pipe from the
condenser.
- Read the temperature indicated on a pressure gauge connected to the liquid outlet of the
condenser.
- The difference between these temperatures provides the subcooling value.
The tests referred to above can be performed using the pressure gauges supplied with the
unit (accessories). Once the checks are complete, close the shut-off valves of the pressure
gauges.
6.2.2 Pump release procedure
• Before starting the pump, check that the moving parts rotate freely.
To release the pump:
• Remove the fan cover from the seat of the rear motor cover.
• Use a screwdriver on the present slot on the motor shaft from the fan side.
• In case of blockage, turn the screwdriver by tapping it lightly with a hammer.
• When the operations are completed, reassemble the components in reverse order.
6.3 Shut-down
6.3.1 Temporary shut-down
Disable the machine according to that described in the relative command section.
Do not disconnect the power supply by acting on the disconnecting switch on board the
machine or the main switch of the system. If no voltage is present, the crankcase heaters
and any anti-freeze heaters cannot work, thereby, posing a risk of freezing.
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