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Maintenance Periodic Checklists
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 S S e e r r v v i i c c e e P P r r o o c c e e d d u u r r e e 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 p p r r e e c c a a u u t t i i o o n n s s i i n n t t h h i i s s m m a a n n u u a a l l a a n n d d
o o n n t t h h e e t t a a g g s s , , s s t t i i c c k k e e r r s s , , a a n n d d l l a a b b e e l l 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 . .
T T e e c c h h n n i i c c i i a a n n s s , , i i n n o o r r d d e e r r t t o o p p r r o o t t e e c c t t t t h h e e m m s s e e l l v v e e s s f f r r o o m m
p p o o t t e e n n t t i i a a l l e e l l e e c c t t r r i i c c a a l l , , m m e e c c h h a a n n i i c c a a l l , , a a n n d d c c h h e e m m i i c c a a l l
h h a a z z a a r r d d s s , , M M U U S S T T f f o o l l l l o o w w p p r r e e c c a a u u t t i i o o n n s s i i n n t t h h i i s s m m a a n n u u a a l l
a a n n d d o o n n t t h h e e t t a a g g s s , , s s t t i i c c k k e e r r s s , , a a n n d d l l a a b b e e l l s s , , a a s s w w e e l l l l a a s s t t h h e e
f f o o l l l l o o w w i i n n g g i i n n s s t t r r u u c c t t i i o o n n s s : : U U n n l l e e s s s s s s p p e e c c i i f f i i e e d d o o t t h h e e r r w w i i s s e e , ,
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 a a l l 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 a a n n d d d d i i s s c c h h a a r r g g e e a a l l l l e e n n e e r r g g y y s s t t o o r r i i n n g g
d d e e v v i i c c e e s s s s u u c c h h a a s s c c a a p p a a c c i i t t o o r r 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 . . W W h h e e n n 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
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 . .
Monthly Checklist
The following check list provides the recommended
maintenance schedule to keep the commercial self-
contained equipment running efficiently.
1. Inspect unit air filters. Clean or replace if airflow is
blocked or if filters are dirty.
2. Inspect coils for excess moisture or icing. Icing on
the coils may indicate low airflow supply, restricted
airflow from dirty fins, evaporator frost protection
sensor problems, or a shortage of refrigerant
flowing through the coil.
3. Check that condensate from the evaporator and
economizer coils flows freely through the
condensate piping, traps, drain pan, and drainage
holes. Remove algae and or any airflow
obstructions.
4. Check the liquid line sight glasses during operation.
Bubbles in the sight glasses indicate a possible
shortage of refrigerant or an obstruction in the
liquid lines, e.g. dirty liquid line filter driers.
5. Inspect filter driers for leaks, flow obstructions, or
temperature drop across the filter drier. A
noticeable temperature differential, e.g. 5°F, in the
liquid line may indicate an obstruction. Replace the
filter drier if it appears clogged.
6. Inspect the optional waterside economizer coil.
Clean the coil to prevent airflow restrictions
through the fins.
7. Check and record operating pressures.
PKG-SVX027C-EN
Semi-Annual Maintenance
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 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 . .
1. With power disconnected, manually rotate the fan
wheel to check for obstructions in the housing or
interference with fan blades. Remove obstructions
and debris. Inspect for any damage to fan blades
and housing. Check impeller for wear/deposits/
corrosion and damage.
2. Check water valves for leakage at valve stem
packing nut.
N N o o t t e e : : Perform this procedure monthly if the unit is
in a coastal or corrosive environment.
Annual Maintenance
Check and tighten all set screws, bolts, locking collars
and sheaves.
1. Inspect, clean, and tighten all electrical connections.
2. Visually inspect the entire unit casing for chips or
corrosion. Remove rust or corrosion and repaint
surfaces.
3. Visually check for leaks in refrigerant piping.
4. Inspect fan, motor, and control contacts. Replace
badly worn or eroded contacts.
5. Inspect the thermal expansion valve sensing bulbs
for cleanliness, good contact with the suction line,
and adequate insulation from ambient air.
6. Verify the superheat setting is 12 -17°F at the
compressor.
When checking operating pressures and conditions,
establish the following nominal conditions for
consistent measurements.
•
Leaving air temperature greater than 60°F
•
Entering air temperature is 80 - 90°F
•
Entering water temperature greater than 65°F
•
Compressors running at full load
•
Drain the condensing water system and inspect it
thoroughly for fouling; clean if necessary.
M M a a i i n n t t e e n n a a n n c c e e
75
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