Operation; Control System; Unit Operations; Seasonal Start-Up - Trane AquaStream2 CGAN 200 Installation Operation & Maintenance

CG-SVX01C-E4

Operation

Control System

The control is through the TRACER
CH532 control module.

Unit operations

- Check the chilled water pump(s)
operates
- Start up the unit following
procedure described in the CH532
controller user guide. The unit will
operate correctly when there is
sufficient water flow. The
compressors will start up if the
evaporator water leaving
temperature is above the control
module setpoint.
Weekly start up
- Check the chilled water pump(s)
operates
- Start up the unit following
procedure described in the CH532
controller user guide.
Weekend shutdown
- If the unit needs to be shut down
for a short period of time, stop the
unit following procedure described
in the CH532 controller user guide.
(See "Clock" menu)
- If the unit is shut down for a
longer period, see under
"Seasonal shutdown", below.
- Ensure that all safeties are taken to
prevent frost damages during
negative ambient temperature.
- Do not put the general disconnect
switches to off, except if the unit is
drained. Trane does not
recommend draining the unit, due
to the fact that it increases tube
corrosion.
Seasonal shutdown
- Check water flows and interlocks.
- Check glycol % in the chilled water
circuit if glycol presence is required
- Carry out leak test.
- Carry out oil analysis
- Record operating pressures,
temperatures, amperages and
voltage.
- Check operation of
machines/compare conditions of
operation against original
commissioning data.
- Stop the unit following procedure
described in the CH532 controller
user guide.
- Ensure that all safeties are taken to
prevent frost damages during
negative ambient temperature.
- Fill out the visit log sheet and
review with the operator - Do not
put the general disconnect switch
to off, except if the unit is drained.
Trane does not recommend
draining the unit, due to the fact
that it increases tube corrosion.

Seasonal start-up

- Check water flows and interlocks.
- Check Ethylene glycol % in the
chilled water circuit if glycol
presence is required
- Check operational set points and
performance.
- Calibrate controls.
- Check operation of all safety
devices.
- Inspect contacts and tighten
terminals.
- Megger the motor compressor
windings.
- Record operating pressures,
temperatures, amperages and
voltage.
- Carry out leak test.
- Check configuration of unit control
module.
- Change the oil as required based
upon results of the oil analysis
made during seasonal shutdown
Get the 8 condition measurements at
the same time, on each circuit.
- HP
- LP
- Suction temperature
- Discharge temperature
- Liquid temperature
- Water entering temperature
- Water leaving temperature
- Outdoor ambient temperature
Then calculate the sub-cooling and
superheat. No diagnosis can be
accurate with one of these records
missing.
- Check operation of
machines/compare conditions of
operation against original
commissioning data.
- Fill out the visit log sheet and
review with the operator
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