Start-Up And Shutdown; Unit Start-Up; Temporary Shutdown And Restart; Extended Shutdown Procedure - Trane Ascend ACS 140 Installation, Operation And Maintenance Manual

Start-up and Shutdown

I I m m p p o o r r t t a a n n t t : : Initial unit commissioning start-up must be
performed by Trane or an agent of Trane
specifically authorized to perform start-up
and warranty of Trane 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

N N O O T T I I C C E E
E E q q u u i i p p m m e e n n t t D D a a m m a a g g e e ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s c c o o u u l l d d r r e e s s u u l l t t i i n n
e e q q u u i i p p m m e e n n t t d d a a m m a a g g e e . .
E E n n s s u u r r e e t t h h a a t t t t h h e e c c o o m m p p r r e e s s s s o o r r a a n n d d o o i i l l s s u u m m p p h h e e a a t t e e r r s s
h h a a v v e e b b e e e e n n o o p p e e r r a a t t i i n n g g p p r r o o p p e e r r l l y y f f o o r r a a m m i i n n i i m m u u m m o o f f 2 2 4 4
h h o o u u r r s s b b e e f f o o r r e e s s t t a a r r t t i i n n g g . .
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.
I I m m p p o o r r t t a a n n t t : : 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
60
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.
To restart the unit after a temporary shutdown, enable
the chilled-water pump and press the AUTO key. The
unit will start normally, provided the following
conditions exist:
• The UC800 receives a call for cooling and the
differential-to-start is above the setpoint.
• 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. Perform normal unit stop sequence.
2. Verify that compressor oil sump heaters are
installed tightly around compressor. Energize and
verify heaters are operational using a temperature
probe. See table below. Install jumper across
thermostat and verify current flow.
N N O O T T I I C C E E
H H e e a a t t e e r r D D a a m m a a g g e e ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s b b e e l l o o w w c c o o u u l l d d r r e e s s u u l l t t i i n n
d d a a m m a a g g e e t t o o t t h h e e h h e e a a t t e e r r . .
I I f f t t h h e e c c h h i i l l l l e e r r e e v v a a p p o o r r a a t t o o r r o o r r e e v v a a p p o o r r a a t t o o r r w w a a t t e e r r p p i i p p i i n n g g
i i s s d d r r a a i i n n e e d d o o f f w w a a t t e e r r , , t t h h e e e e v v a a p p o o r r a a t t o o r r i i m m m m e e r r s s i i o o n n
h h e e a a t t e e r r m m u u s s t t b b e e d d e e - - e e n n e e r r g g i i z z e e d d . .
AC-SVX002D-EN