Water Piping - Trane CXAO Installation Operation & Maintenance

2.12

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 fi lter 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 fi lter to prevent cavitation). Use of a
fi lter prolongs the life of the pump and helps keep the
hydraulic system in best condition.
RF-SVX003A-GB
EVAP
1 Gauge
2 Flexible connector
3 Flow switch
4 Thermometer
1 Gauge
2 Flexible connector
4 Thermometer
7. Another fi lter must be installed on the pipe conveying
ingoing water to the unit, near the evaporator and heat
recovery (if installed). The fi lter 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..
5 Isolating valve
6 Pump
7 Filter
5 Isolating valve
6 Pump
7 Filter
Water piping
19