Minimum Water Volume - Trane CGWH 115 Installation Operation & Maintenance

Figure 2
10
1. Pressure gauges: show entering and
leaving water pressure (2 pressure
ports are available inside of the unit -
see item 1 in Figure 2)
2. Balancing valve: adjusts water flow.
3. Air purge: allows to remove the air
from the water circuit during fill up.
4. Stop valves: isolate chillers and water
circuiting pump during maintenance
operations.
5. Thermometers: indicate chilled water
entering and leaving temperatures
(not mandatory).
6
Installation
Before making any connections,
make sure the labeling for entering
and leaving water corresponds to
the submittals.
Install water circulation pump
upstream of the evaporator,
insuring that the evaporator is
under positive pressure.
Tables for water connections
diameter are shown on the certified
submittals.
These drawings are available on
request from your Trane Sales
Office.
6. Expansion compensators: avoid
mechanical stress between chiller
and piping installation.
7. Stop valve located on the outlet
connection: used to measure the
water pressure inlet or outlet of
evaporator.

Minimum water volume

Why is the water volume an
important parameter?
The water volume is an important
parameter because it allows a
stable chilled water temperature
and avoids short cycle operation of
the compressors.
Parameters which influence the
water temperature stability
• Water loop volume.
• Load fluctuation.
• Number of capacity steps.
• Compressors rotation.
• Dead band (adjusted by control
CH530).
• Minimum time between 2 starts
of a compressor.
Minimum water volume for a
comfort application
For comfort application we can
allow water temperature fluctuation
at part load.
The parameter to take into account
is the minimum operating time of
the compressor. In order to avoid
any lubrication problem, scroll
compressor must run for at least
2 minutes (120 seconds) before it
stops.
8. Strainer: avoid getting heat
exchangers dirty. All installation must
be equipped with efficient strainer
in order that only clean water enters
into exchanger. If there is no strainer,
reserve will be formulated by the
Trane technician at the start-up of the
unit. The strainer used must be able
to stop all particles with a diameter
greater than 1.6 mm.
9. Draining and charging: used to drain
and charge the plate heat exchanger.
10. Charging valve
CGWH-SVX01D-E4