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Startup
W W A A R R N N I I N N G G
L L i i v v e e E E l l e e c c t t r r i i c c a a l l C C o o m m p p o o n n e e n n t t s s ! !
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 a a l l l l e e l l e e c c t t r r i i c c a a l l s s a a f f e e t t y y p p r r e e c c a a u u t t i i o o n n s s
w w h h e e n n e e x x p p o o s s e e d d t t o o l l i i v v e e e e l l e e c c t t r r i i c c a a l l c c o o m m p p o o n n e e n n t t 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 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 . .
W W h h e e n n i i t t i i s s n n e e c c e e s s s s a a r r y y t t o o w w o o r r k k w w i i t t h h l l i i v v e e e e l l e e c c t t r r i i c c a a l l
c c o o m m p p o o n n e e n n t t s s , , h h a a v v e e a a q q u u a a l l i i f f i i e e d d l l i i c c e e n n s s e e d d e e l l e e c c t t r r i i c c i i a a n n
o o r r o o t t h h e e r r i i n n d d i i v v i i d d u u a a l l w w h h o o h h a a s s b b e e e e n n p p r r o o p p e e r r l l y y t t r r a a i i n n e e d d
i i n n h h a a n n d d l l i i n n g g l l i i v v e e e e l l e e c c t t r r i i c c a a l l c c o o m m p p o o n n e e n n t t s s p p e e r r f f o o r r m m
t t h h e e s s e e t t a a s s k k s s . .
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 ! !
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 w w i i l l l l c c a a u u s s e e 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 t t o o o o p p e e r r a a t t e e i i n n a a v v a a c c u u u u m m a a n n 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 . .
N N e e v v e e r r m m a a n n u u a a l l l l y y o o r r a a u u t t o o m m a a t t i i c c a a l l l l y y p p u u m m p p d d o o w w n n
s s y y s s t t e e m m b b e e l l o o w w 7 7 p p s s i i g g . .
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 ! !
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
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 . .
K K e e e e p p c c r r a a n n k k c c a a s s e e h h e e a a t t e e r r s s o o n n w w h h e e n n e e v v e e r r r r e e f f r r i i g g e e r r a a n n t t i i s s
i i n n t t h h e e s s y y s s t t e e m m . .
I I f f c c r r a a n n k k c c a a s s e e h h e e a a t t e e r r s s h h a a v v e e n n o o t t b b e e e e n n o o n n w w i i t t h h
r r e e f f r r i i g g e e r r a a n n t t i i n n t t h h e e s s y y s s t t e e m m , , t t u u r r n n t t h h e e c c r r a a n n k k c c a a s s e e
h h e e a a t t e e r r s s o o n n 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 c c o o m m p p r r e e s s s s o o r r s s . .
To start the unit, complete the following steps in order.
Review
"Preliminary Refrigerant Charging," p.
applicable. Confirm all steps were completed.
Final Refrigerant Charge
If full charge was not used during installation, follow
these steps:
1. Determine remaining charge required by
subtracting charge added during
Refrigerant Charging," p. 34
2. With all circuit compressors running, SLOWLY
meter remaining R-410A into the suction line from
the LIQUID charging connection.
PKG-SVX027C-EN
34, if
"Preliminary
from the total.
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 ! !
O O v v e e r r c c h h a a r r g g i i n n g g s s y y s s t t e e m m 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
f f a a i i l l u u r r e e a a n n d d / / o o r r r r e e d d u u c c e e d d c c o o m m p p r r e e s s s s o o r r l l i i f f e e . .
D D o o n n o o t t o o v v e e r r c c h h a a r r g g e e s s y y s s t t e e m m . . E E x x c c e e s s s s i i v v e e r r e e f f r r i i g g e e r r a a n n t t
c c h h a a r r g g i i n n g g c c a a n n c c a a u u s s e e c c o o m m p p r r e e s s s s o o r r l l i i q q u u i i d d s s l l u u g g g g i i n n g g a a t t
s s t t a a r r t t u u p p , , a a n n d d c c o o n n d d i i t t i i o o n n s s w w h h e e r r e e c c o o m m p p r r e e s s s s o o r r s s a a n n d d / / o o r r
c c o o n n d d e e n n s s e e r r f f a a n n s s s s h h o o r r t t c c y y c c l l e e . .
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 ! !
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
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 a a n n d d / / o o r r r r e e d d u u c c e e d d c c o o m m p p r r e e s s s s o o r r
l l i i f f e e . .
T T o o p p r r e e v v e e n n t t c c o o m m p p r r e e s s s s o o r r l l i i q q u u i i d d s s l l u u g g g g i i n n g g , , o o n n l l y y a a d d d d
l l i i q q u u i i d d 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 w w h h e e n n 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 i i s s
r r u u n n n n i i n n g g . . U U s s e e e e x x t t r r e e m m e e c c a a u u t t i i o o n n t t o o m m e e t t e e r r 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 i i n n t t o o 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 l l o o w w l l y y . . I I f f l l i i q q u u i i d d i i s s
a a d d d d e e d d t t o o o o r r a a p p i i d d l l y y , , c c o o m m p p r r e e s s s s o o r r o o i i l l d d i i l l u u t t i i o o n n a a n n d d o o i i l l
p p u u m m p p o o u u t t c c o o u u l l d d o o c c c c u u r r . .
3. Use an accurate scale to measure and record
amount of R-410A added.
4. After unit has been operating for approximately 30
minutes at full load, measure and record operating
pressures.
5. Repeat for other circuits.
6. Confirm, and adjust charge, if necessary, by
checking subcooling at AHRI 340/360 full load
operating conditions (80°/67°F db/wb entering
evaporator, ~300 cfm/ton, 85°/95°F EWT/LWT for
water-cooled). Some TXV superheat adjustment
may be necessary, but only, after adequate
subcooling has been reached.
N N o o t t e e : : Water-cooled subcooling should be 10.5°F –
12.5°F.
Startup Procedure
Using the startup log on the following pages, establish
nominal conditions for consistent measurements as
follows:
•
Leaving air greater than 60°F
•
Entering air temperature = 70 to 90°F
•
Entering water temperature > 60°F
With all compressors running at full load:
1. Compute superheat from the suction line pressure
and temperature at the compressor on each circuit.
Adjust the thermal expansion valve settings if
necessary. Superheat should be between 14 and
20°F.
2. Inspect refrigerant flow in the liquid line sight glass.
63
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