Water Piping - Trane CGCN Installation Operation & Maintenance

Control of compressor fastening
The scroll compressors are fitted on shock absorbers. After receiving the unit please check carefully if there are
blockages to fasten the compressors during the transportation. If yes, it is necessary to remove these blockages
before the CGCN/CXCN unit will be started-up otherwise the warranty is not valid.
Acoustic Protection
When the sound level must be checked, pay attention to isolation from the base of the unit, properly applying the
optional anti-vibration mounts. Install flexible joints on all water connections.

Water piping

Piping must be designed with the lowest number of curves and the lowest number of vertical changes of direction.
In this way, installation costs are reduced considerably and system performance is improved.
The hydraulic system should have::
1. Anti-vibration supports in order to reduce transmission of vibrations to the underlying structure.
2. Sectioning valves to isolate the unit from the hydraulic system during servicing.
3. Manual or automatic air bleeding device at the system's highest point. Drainage device at the system's lowest
point. Both the evaporator and the heat recovery device must not be positioned at the system's highest point.
4. A device that can maintain the hydraulic system under pressure (expansion tank, etc.)
5. Water temperature and pressure indicators on the unit to aid servicing and maintenance operations.
6. A filter or device that can remove extraneous particles from the water before it enters the pump (Please consult
the pump manufacturer's recommendations for an appropriate filter to prevent cavitation). Use of a filter
prolongs the life of the pump and helps keep the hydraulic system in best condition.
7. Another filter must be installed on the pipe conveying ingoing water to the unit, near the evaporator and
heat recovery (if installed). The filter avoids solid particles entering the heat exchanger, as they could damage it
or reduce its heat exchanging capacity.
8. The shell and tube heat exchanger has an electrical resistance with a thermostat that ensures protection
against water freezing up to an outdoor temperature of – 25°C. All the other hydraulic piping outside the
unit must therefore be protected against freezing.
9. The heat recovery device must be emptied of water during the winter season, unless an ethylene glycol mixture
in appropriate percentage is added to the water circuit.
10. If the unit is installed in order to replace another, the entire hydraulic system must be emptied and cleaned
before the new unit is installed. Regular tests and proper chemical treatment of water are recommended before
starting up the new unit.
11. In the event that glycol is added to the hydraulic system as anti-freeze protection, pay attention to the fact that
intake pressure will be lower, the unit's performance will be lower and water pressure drops will be greater.
All unit-protection methods, such as anti-freeze, and low-pressure protection will need to be reset.
Before insulating water piping, check that there are no leaks.
1 = Gauge
2 = Flexible connector
3 = Flow switch
4 = Thermometer
5 = Isolating valve
6 = Pump
7 = Filter