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 . .

☐ Check the unit's drain pans and condensate piping

to ensure that there are no blockages.

☐ Inspect the evaporator and condenser coils for dirt,

bent fins, etc. If the coils appear dirty, clean them

according to the instructions described in "Coil

Cleaning" later in this section.

☐ Inspect the F/A-R/A damper hinges and pins to

ensure that all moving parts are securely mounted.

Keep the blades clean as necessary.

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 . .

☐ Manually rotate the condenser fans to ensure free

movement and check motor bearings for wear.

Verify that all of the fan mounting hardware is tight.

☐ Verify that all damper linkages move freely;

lubricate with white grease, if necessary.

☐ Check supply fan motor bearings; repair or replace

the motor as necessary.

☐ Check the fan shaft bearings for wear. Replace the

bearings as necessary.

N N o o t t e e : : These bearings are considered permanently

lubricated for normal operation. For severe

dirty applications, if relubrication becomes

necessary, use a lithium based grease. See

Table 69, p. 120

I I m m p p o o r r t t a a n n t t : : The bearings are manufactured using a

special synthetic lithium-based grease

designed for long life and minimum

relube intervals. Over lubrication can be

just as harmful as not enough.

RT-SVX34R-EN

for recommended greases.

☐ Use a hand grease gun to lubricate these bearings;

add grease until a light bead appears all around the

seal. Do not over lubricate! After greasing the

bearings, check the setscrews to ensure that the

shaft is held securely. Make sure that all bearing

braces are tight.

☐ Check the supply fan belt(s). If the belts are frayed

or worn, replace them. Refer to the

Adjustment," p. 116

for belt replacement and

adjustments.

☐ Check the condition of the gasket around the

control panel doors. These gaskets must fit

correctly and be in good condition to prevent water

leakage.

☐ Verify that all wire terminal connections are tight.

☐ Remove any corrosion present on the exterior

surfaces of the unit and repaint these areas.

☐ Generally inspect the unit for unusual conditions (e.

g., loose access panels, leaking piping connections,

etc.)

☐ Make sure that all retaining screws are reinstalled in

the unit access panels once these checks are

complete.

☐ With the unit running, check and record the

following:

–

ambient temperature

–

compressor oil level (each circuit)

–

compressor suction and discharge pressures

(each circuit)

–

superheat and subcooling (each circuit)

Record this data on an "operator's maintenance log"

like the one shown in

, p.

pressures indicate a refrigerant shortage, measure the

system superheat and system subcooling. For

guidelines, refer to

"Charging by Subcooling," p.

I I m m p p o o r r t t a a n n t t : : Do not release refrigerant to the

atmosphere! If adding or removing

refrigerant is required, the service

technician must comply with all federal,

state and local laws. Refer to general

service bulletin MSCU-SB-1 (latest edition).

Heating Season