Final Refrigerant Charge - Trane IntelliPak SCWF 20 Installation, Operation And Maintenance Manual

Commercial self-contained signature series 20 to 110 tons

Table of Contents

S S t t a a r r t t u u p p

N N o o t t e e : : Sufficient cooling load must be visible to

refrigerant circuit controls for mechanical

refrigeration to operate. If necessary,

temporarily reduce the discharge air setpoint

to verify the refrigeration cycle operation.

9. Check voltage at all compressor terminals to ensure

it is within 10% of nameplate voltage.

10. Check voltage imbalance from these three voltage

readings at each compressor. Maximum allowable

voltage imbalance, phase to phase is 2%.

11. Start the first step compressor only.

12. Check amp draw at compressor terminals. RLA and

LRA are on the unit nameplate.

13. Measure amp draw at evaporator fan motor

terminals. FLA data is on the motor nameplate.

14. As soon as a compressor starts, verify correct

rotation. If a scroll compressor is allowed to run

backwards for even a very short period of time,

internal compressor damage could occur and

compressor life could be reduced. When rotating

backwards scroll compressors make a loud noise,

do not pump, and draw about 1/2 expected amps,

and low side shell gets hot. Immediately shut off a

compressor rotating backwards and correct wiring.

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 d d a a m m a a g g e e . .

I I m m p p r r o o p p e e r r p p o o w w e e r r p p h h a a s s i i n n g g w w i i l l l l 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 t t o o

r r u u n n b b a a c c k k w w a a r r d d s s . . C C o o m m p p r r e e s s s s o o r r c c o o u u l l d d b b e e r r u u n n n n i i n n g g

b b a a c c k k w w a a r r d d s s i i f f i i t t i i s s n n o o i i s s y y , , l l o o w w s s i i d d e e s s h h e e l l l l g g e e t t s s h h o o t t , ,

s s u u c c t t i i o o n n p p r r e e s s s s u u r r e e d d o o e e s s n n o o t t d d r r o o p p w w i i t t h h i i n n 5 5 s s e e c c o o n n d d s s

a a f f t t e e r r s s t t a a r r t t u u p p , , a a n n d d c c o o m m p p r r e e s s s s o o r r o o n n l l y y d d r r a a w w s s ½ ½

e e x x p p e e c c t t e e d d a a m m p p s s . . S S t t o o p p 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 m m m m e e d d i i a a t t e e l l y y

a a n n d d 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 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 t t e e c c h h n n i i c c i i a a 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 3 3 p p h h a a s s e e p p o o w w e e r r c c o o r r r r e e c c t t t t h h e e

w w i i r r i i n n g g . .

15. A A i i r r C C o o o o l l e e d d O O n n l l y y : Check condenser fans for proper

rotation. From top of unit, correct rotation direction

is clockwise. If running backwards, correct wiring.

W W A A R R N N I I N N G G

R R o o t t a a t t i i n n g g 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 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 r r o o t t a a t t i i n n g g c c o o m m p p o o n n e e n n t t s s c c u u t t t t i i n n g g a a n n d d s s l l a a s s h h i i n n g g

t t e e c c h h n n i i c c i i a a n n w w h h i i c c h h 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 u u r r i i n n g g i i n n s s t t a a l l l l a a t t i i o o n n , , t t e e s s t t i i n n g g , , s s e e r r v v i i c c i i n n g g a a n n d d

t t r r o o u u b b l l e e s s h h o o o o t t i i n n g g o o f f t t h h i i s s p p r r o o d d u u c c t t i i t t m m a a y y b b e e

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 a a n n d d e e x x p p o o s s e e d d r r o o t t a a t t i i n n g g

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 o o r r l l i i c c e e n n s s e e d d s s e e r r v v i i c c e e

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 e e x x p p o o s s e e d d r r o o t t a a t t i i n n g g 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 . .

16. After 10 minutes, start second compressor of

manifold circuits.

17. Allow 10 minutes for circuit operation to stabilize at

full load.

18. Complete charging, if required.

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. 41

2. With all circuit compressors running, SLOWLY

meter remaining R-410A into the suction line from

the LIQUID charging connection.

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.

A A i i r r C C o o o o l l e e d d O O n n l l y y : Operating pressure measurement

must be made with all condenser fans running.

5. Repeat for other circuits.

6. Confirm, and adjust charge if needed, by checking

subooling at AHRI 340/360 full load operating

conditions (80/67°F entering evap, ~300CFM/ton, 85/