Start-Up And Shutdown; Unit Start-Up; Temporary Shutdown And Restart; Extended Shutdown Procedure - Trane Ascend ACR Series 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
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.
66
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.
N N O O T T I I C C E E
P P u u m m p p 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 p p u u m m p p
d d a a m m a a g g e e . .
L L o o c c k k t t h h e e c c h h i i l l l l e e d d w w a a t t e e r r p p u u m m p p d d i i s s c c o o n n n n e e c c t t s s o o p p e e n n a a n n d d
v v e e r r i i f f y y p p u u m m p p i i s s o o f f f f b b e e f f o o r r e e d d r r a a i i n n i i n n g g w w a a t t e e r r . .
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.
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 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 h h e e a a t t e e r r
d d a a m m a a g g e e . .
D D o o n n o o t t a a p p p p l l y y p p o o w w e e r r t t o o 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 h h e e a a t t e e r r s s
w w h h e e n n n n o o w w a a t t e e r r i i s s p p r r e e s s e e n n t t . .
5. Open the main electrical disconnect and lock in the
"OPEN" position.
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 . .
L L o o c c k k t t h h e e d d i i s s c c o o n n n n e e c c t t i i n n t t h h e e " " O O P P E E N N " " p p o o s s i i t t i i o o n n t t o o
p p r r e e v v e e n n t t a a c c c c i i d d e e n n t t a a l l s s t t a a r r t t - - u u p p a a n n d d d d a a m m a a g g e e t t o o t t h h e e
s s y y s s t t e e m m w w h h e e n n i i t t h h a a s s b b e e e e n n s s h h u u t t d d o o w w n n f f o o r r e e x x t t e e n n d d e e d d
p p e e r r i i o o d d s s . .
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