Carrier 30RB Series - Unit Operations and Maintenance; Start-up; Compressor and Pump Replacement; Unit Protection Devices

30RB/30RQ
GB - 12
Start-up, compressor and pump replacement, unit protection devices
Start-up
Unit start-up is done by the electronic control described above, and
must always be carried out under the supervision of a quali ed air
conditioning engineer.
Necessary checks/precautions before start-up
- Ensure that all electrical connections are properly tightened.
- Ensure that the unit is level and well-supported.
- Check that the hydraulic circuit has su cient water  ow and that the
pipe connections correspond to the installation diagram.
- Ensure that there are no water losses. Check the correct operation of
the valves installed.
- All panels should be  tted and  rmly secured with the corresponding
screws.
- Make sure that there is su cient space for servicing and maintenance
purposes.
- Ensure that there are no refrigerant leaks.
- Con rm that the electrical power source agrees with the unit
nameplate rating, wiring diagram and other documentation for the
unit.
- Ensure that the power supply corresponds to the applicable standards.
- Make sure that compressors  oat freely on the mounting springs.
Compressor replacement
As the compressors are hermetic, when an internal fault occurs, the
compressor must be replaced.
This must be done as detailed below:
- Disconnect the unit from the electrical supply.
- Remove the access panels.
- Remove the gas from the refrigerant circuit using recovery equipment
to avoid harming the atmosphere.
- Electrically disconnect the compressor.
- Unbraze or unscrew the suction and discharge lines, taking care not to
damage the rest of the components.
- Remove the compressor fastenings.
- Replace the compressor, ensuring that it contains su cient oil.
- Braze or screw in the lines.
- Connect the compressor according to the wiring diagram.
- Evacuate the compressor.
- Introduce the quantity of refrigerant indicated on the nameplate
through the service couplings located on the high and low pressure
side.
NOTE:
This operation must be carried out by a quali ed person.
Pump replacement
If the water pump needs to be replaced, proceed as follows:
- Disconnect the unit from the power supply.
- Open/remove the access panel/s
- Electrically disconnect the pump.
- Empty all water from the hydronic module.
- Loosen the pipe unions a and c.
- Remove the four pump  xing screws b.
- Replace the pump.
- Fit the pump  xing screws b.
- Tighten the pipe unions a and c.
- Electrically connect the pump
- Connect the unit to the power supply
- Make sure the pump rotates in the right direction using the hole in the
back panel.
- Reinstall the lateral access panel.
Description of unit protection devices
The unit includes the following protection devices:
- Internal compressor protection.
- Fan motor internal thermal protection.
- Main switch.
- Anti-short-cycle protection.
- Thermomagnetic main switch.
- Thermomagnetic control switch
- Fan circuit breaker, heaters and compressor.
- Defrost thermostat.
- Fault detector for the temperature and pressure sensors.
- High pressurestat: this protects the unit against excessive condensing
pressure.
The high pressurestat has factory- xed non-adjustable settings. The
appliance stops due to the intervention of the high pressure alarm
threshold, before the high pressurestat intervenes.
This function is performed by the electronic control device via a
pressure transducer.
- Low pressurestat: This function is performed by the electronic control
device via a pressure transducer.
Only on appliances with hydronic module
- Pump motor external thermal protection.
1
2
3
1 pipe union
2 screw
3 pipe union