Pre-Start; Evp Chiller Applications; System Evacuation Procedures - Trane RAUJ-C20 Installation, Operation And Maintenance Manual

Pre-Start

Use the checklist provided below in conjunction with
the "General Unit Requirement" checklist" to ensure
that the unit is properly installed and ready for
operation. Be sure to complete all of the procedures
described in this section before starting the unit for the
first time.
W W A A R R N N I I N N G G
H H a a z z a a r r d d o o u u s s V V o o l l t t a a g g e e ! !
F F a a i i l l u u r r e e t t o o d d i i s s c c o o n n n n e e c c t t p p o o w w e e r r b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g 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 e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y . .
D D i i s s c c o o n n n n e e c c t t a a l l l l e e l l e e c c t t r r i i c c p p o o w w e e r r , , i i n n c c l l u u d d i i n n g g r r e e m m o o t t e e
d d i i s s c c o o n n n n e e c c t t s s b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g . . F F o o l l l l o o w w p p r r o o p p e e r r
l l o o c c k k o o u u t t / / t t a a g g o o u u t t p p r r o o c c e e d d u u r r e e s s t t o o e e n n s s u u r r e e t t h h e e p p o o w w e e r r
c c a a n n n n o o t t b b e e i i n n a a d d v v e e r r t t e e n n t t l l y y e e n n e e r r g g i i z z e e d d . . V V e e r r i i f f y y t t h h a a t t n n o o
p p o o w w e e r r i i s s p p r r e e s s e e n n t t w w i i t t h h a a v v o o l l t t m m e e t t e e r r . .
• Turn the field supplied disconnect switch, located
upstream of the unit, to the "Off" position.
N N o o t t e e : : Verify that the 115 volt control switch (1S2) in
the unit control box is in the "Off" position.
• Turn the "System" selection switch (at the Remote
Panel) to the "Off" position and the "Fan" selection
switch (if applicable) to the "Auto" or "Off"
position.
• Check all electrical connections for tightness and
"point of termination" accuracy.
• Verify that the condenser airflow will be
unobstructed.
• Check the condenser fan blades. Ensure they rotate
freely within the fan orifices and are securely
fastened to the fan motor shaft.
• Disable the compressor(s) by unplugging the reset
relay for each circuit. Refer to the unit-wiring
diagram that shipped with the unit.
N N O O T T I I C C E E
C C o o m m p p r r e e s s s s o o r r D D a a m m a a g g e e ! !
E E x x c c e e s s s s i i v v e e l l i i q q u u i i d d a a c c c c u u m m u u l l a a t t i i o o n n i i n n t t h h e e s s u u c c t t i i o o n n l l i i n n e e 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 c c o o m m p p r r e e s s s s o o 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 l l l l o o w w l l i i q q u u i i d d r r e e f f r r i i g g e e r r a a n n t t t t o o e e n n t t e e r r t t h h e e s s u u c c t t i i o o n n
l l i i n n e e . .
• Verify that all compressor service valves, discharge
service valves, and liquid line service valves are
back seated on each circuit.
I I m m p p o o r r t t a a n n t t : : COMPRESSOR SERVICE VALVES MUST
BE FULLY OPENED BEFORE START-UP
(SUCTION, DISCHARGE, AND LIQUID
LINE).
I I m m p p o o r r t t a a n n t t : : After liquid line service valves are fully
opened (back seated), close just 1/4 turn
to allow for fan pressure control (4S7,
4S8) operation.
94
• Check the compressor oil levels. Oil levels must be
near or above the top of all compressor sight
glasses.
• P P a a c c k k S S t t o o c c k k U U n n i i t t s s : : Two low pressure switches are
installed at the factory. However, only one is wired
into the control circuit. This is to facilitate an EVP
chiller or air over evaporator application. Before
starting the system, verify that the correct pressure
switch is connected to the control circuit. See
Pressure Control Switch Settings table in Start-Up
chapter for the pressure control settings, and the
unit wiring diagram that shipped with the unit, for
the appropriate connections.
• Check the condenser coils. They should be clean
and the fins should be straight. Straighten any bent
coil fins with an appropriate sized fin comb.
• Inspect the interior of the unit for tools and debris.

EVP Chiller Applications

• Flush building piping.
N N O O T T I I C C E E
H H e e a a t t E E x x c c h h a a n n g g 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
h h e e a a t t e e x x c c h h a a n n g g e e r r d d a a m m a a g g e e . .
I I f f a a n n a a c c i i d d i i c c c c o o m m m m e e r r c c i i a a l l f f l l u u s s h h i i n n g g s s o o l l u u t t i i o o n n i i s s u u s s e e d d , ,
b b y y p p a a s s s s t t h h e e E E V V P P c c h h i i l l l l e e r r t t o o p p r r e e v v e e n n t t d d a a m m a a g g e e . .
• Clean strainer. Make sure strainer blow down valve
or plug is in place.
• Connect chiller. Make sure chiller 1/2"x14 NPTE
plug is in place.
• Close drain valve
• Fill system with water.
• Vent system piping at the highest points.
• Inspect water piping for leaks and repair.

System Evacuation Procedures

N N O O T T I I C C E E
O O p p e e r r a a t t i i n n g g U U n n d d e e r r V V a a c c u u u u m m ! !
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 t t h h e e s s e e i i n n s s t t r r u u c c t t i i o o n n s s w w i i l l l l r r e e s s u u l l t t i i n n
c c o o m m p p r r e e s s s s o o r r f f a a i i l l u u r r e e . .
D D o o n n o o t t o o p p e e r r a a t t e e o o r r 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 c c o o m m p p r r e e s s s s o o r r
w w h h i i l l e e u u n n d d e e r r a a v v a a c c u u u u m m . .
Each refrigeration circuit for split system applications
must be evacuated before the unit can be started. Use a
rotary type vacuum pump capable of pulling a vacuum
of 100 microns or less. Verify that the unit disconnect
switch and the system control circuit switches are
"OFF".
SS-SVX11K-EN