RTAF-SVX001A-EN
49
Start-Up and Shutdown
Important:
Initial unit commissioning start-up must be
performed by Trane or an agent of Trane
specifically authorized to perform start-up
and warranty ofTrane products. Contractor
shall provide Trane (or an agent of Trane
specifically authorized to perform start-up)
with notice of the scheduled start-up at least
two weeks prior to the scheduled start-up.
Unit Start-Up
If required, once the system has been operating for
approximately 30 minutes and has become stabilized,
complete the remaining start-up procedures, as follows:
1.
Check the evaporator refrigerant pressure and the
condenser refrigerant pressure under Refrigerant
Report on the AdaptiView ™TD7. The pressures are
referenced to sea level (14.6960 psia).
2. 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 the General
Information Section.
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.
If chiller is limited by any limiting conditions, contact local
Trane service organization for more information.
Temporary Shutdown And
Restart
To shut the unit down for a short time, use the following
procedure:
1.
Press the STOP key on the Adaptiview TD7. The
compressors will continue to operate and an
operational pumpdown cycle will be initiated.
2. UC800 pump control will turn off the pump (after a
minimum 1 min. delay) when the STOP key is pressed
and automatically restart the pump when the unit
starts normally.
3. The unit will start normally, provided the following
conditions exist:
a. The UC800 receives a call for cooling and the
differential-to-start is above the setpoint.
b. All system operating interlocks and safety circuits
are satisfied.
Extended Shutdown Procedure
The following procedure is to be followed if the system is
to be taken out of service for an extended period of time,
e.g. seasonal shutdown:
1. Test the unit for refrigerant leaks and repair as
necessary.
2. Open the electrical disconnect for the chilled water
pump. Lock the switches in the “OPEN” position.
3. Close all chilled water supply valves. Drain the water
from the evaporator.
4. With the water drained from evaporator, disconnect
115 power from evaporator heaters at terminals 1X4-1
and 1X4-2.
5. Open the main electrical disconnect and lock in the
“OPEN” position.
6. At least every three months (quarterly), check the
refrigerant pressure in the unit to verify that the
refrigerant charge is intact.
NOTICE:
Equipment Damage!
Ensure that the compressor and oil sump heaters have
been operating properly for a minimum of 24 hours
before starting. Failure to do so could result in
equipment damage.
NOTICE:
Equipment Damage!
To prevent pump damage, lock the chilled water pump
disconnects open and verify pump is off before draining
water.
NOTICE:
Equipment Damage!
Applying power to the evaporator heaters when no
water is present could result in damage to heaters.
NOTICE:
Equipment Damage!
Lock the disconnect in the “OPEN” position to prevent
accidental start-up and damage to the system when it
has been shut down for extended periods.
