Start-Up - Trane RTWD Installation Operation & Maintenance

Start-up

If the pre-start checkout, has been completed, the unit is
ready to start.
1. Press the STOP key on the CH530.
2. As necessary, adjust the setpoint values in the CH530
menus using TechView.
3. Close the fused-disconnect switch for the chilled
water pump. Energize the pump(s) to start water
circulation.
4. Check the service valves on the discharge line,
suction line, oil line and liquid line for each circuit.
These valves must be open (backseated) before
starting the compressors.
CAUTION
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 CH530 TechView. The pressures are
referenced to sea level (1.0135 bar abs).
8. Check the EXV sight glasses after suffi cient time has
elapsed to stabilize the chiller. The refrigerant fl ow
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 identifi ed 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 the 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 vapor by
connecting the charging line to the suction service
valve and charging through the backseat port until
operating conditions become normal.
RLC-SVX14H-GB
Seasonal Unit Start-Up Procedure
1. Close all valves and re-install the drain plugs in the
evaporator and condenser heads.
2. Service the auxiliary equipment according to the
start-up/maintenance instructions provided by the
respective equipment manufacturers.
3. Vent and fi ll the cooling tower, if used, as well as
the condenser and piping. 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 the valves in the evaporator chilled water
circuits.
5. If the evaporator was previously drained, vent and fi ll
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.
6. Verify condenser coils are clean.
CAUTION
Equipment Damage!
Ensure that the oil separator and compressor heaters
have been operating for a minimum of 24 hours before
starting. Failure to do so may result in equipment
damage.
CAUTION
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.
Pre-Start Checkout
83