Seasonal Unit Start-Up Procedure; Limit Conditions - Trane CGAM Installation & Operation Manual

Unit Start-Up Procedures
NOTICE:
Compressor Damage!
Catastrophic damage to the compressor will occur if
the oil line shut off valve or the isolation valves are left
closed on unit start-up.
5. Press the AUTO key. If the chiller control calls for
cooling and all safety interlocks are closed, the unit will
start.The compressor(s) will load and unload in
response to the leaving chilled water temperature.
6. Verify that the chilled water pump runs for at least one
minute after the chiller is commanded to stop (for
normal chilled water systems).
Note: Once the system has been operating for
approximately 30 minutes and has become
stabilized, complete the remaining start-up
procedures, as follows:
7. Check the evaporator refrigerant pressure and the
condenser refrigerant pressure under Refrigerant
Report on the CH530TechView.
Note: The pressures are referenced to sea level (14.6960
psia).This value is adjustable inTechView.
8. Check the EXV sight glasses after sufficient time has
elapsed to stabilize the chiller.The refrigerant flow past
the sight glasses should be clear. Bubbles in the
refrigerant indicate either low refrigerant charge or
excessive pressure drop in the liquid line or a stuck
open expansion valve. A restriction in the line can
sometimes be identified by a noticeable temperature
differential between the two sides of the restriction.
Frost will often form on the line at this point. Proper
refrigerant charges are shown in General Data tables.
Note: Important! A clear sight glass alone does not mean
that the system is properly charged. Also check
system subcooling, liquid level control and unit
operating pressures.
9. Measure the system subcooling.
10. A shortage of refrigerant is indicated if operating
pressures are low and subcooling is also low. If the
operating pressures, sight glass, superheat and
subcooling readings indicate a refrigerant shortage,
gas-charge refrigerant into each circuit, as required.
With the unit running, add refrigerant liquid charge
slowly thought the suction line service valve until
operating conditions become normal.
Print out a Chiller Service Report fromTechView to file a
start-up claim and to keep for reference with the chiller.

Seasonal Unit Start-Up Procedure

1. Close all valves and re-install drain plugs in evaporator
heads.
128
2. Service the auxiliary equipment according to the start-
up/maintenance instructions provided by the
respective equipment manufacturers.
3. At this point, all air must be removed from the system
(including each pass). Close the vents in the evaporator
chilled water circuits.
4. Open all valves in evaporator chilled water circuits.
5. If the evaporator was previously drained, vent and fill
the evaporator and chilled water circuit. When all air is
removed from the system (including each pass), install
the vent plugs in the evaporator water boxes.
NOTICE:
Equipment Damage!
Ensure that the oil sump heaters have been operating
for a minimum of 24 hours before starting. Failure to do
so may result in equipment damage.
Compressor Damage!
NOTICE:
Compressor Damage!
Catastrophic damage to the compressor will occur if
the oil line shut off valve or the isolation valves are left
closed on unit start-up.

Limit Conditions

CH530 will automatically limit certain operating
parameters during startup and run modes to maintain
optimum chiller performance and prevent nuisance
diagnostic trips.These limit conditions are noted in
Table 70.
Table 70. Limit Conditions
Condition Description
The chiller, circuit, and compressor are
currently running, but the operation of the
Running - Limited chiller/compressor is being actively limited by
the controls. Further information is provided
by the sub-mode.
The circuit is experiencing condenser
Capacity Limited by pressures at or near the condenser limit
High Cond Press setting. The compressor will be unloaded to
prevent exceeding the limits.
The circuit is experiencing saturated
evaporator temperatures at or near the Low
Capacity Limited by Low
Refrigerant Temperature Cutout setting. The
Evap Rfgt Temp
compressors will be unloaded to prevent
tripping.
The circuit is experiencing high discharge
temperatures. The circuit will be unloaded
Discharge Temperature
(or, if at minimum capacity, shall be
Limit
prevented from loading further) to reduce
discharge temperature.
CG-SVX17E-EN