York YPAL 060 User Manual

JOHNSON CONTROLS

FORM 100.50-NOM6 (1207)

The fi lter/drier should be replaced any time work is 
per formed on the refrigerant circuit. The rooftop unit 
comes with sealed type (non-replaceable) cores as 
stan dard. If the unit is not equipped with the op tion al 
valve package (suction, discharge, & liquid line valves), 
the refrigerant will need to be recovered with a recovery 
ma chine to replace the fi lter/drier.

If the unit is equipped with a valve pack age, the unit 
can be pumped down by clos ing the liquid line ball 
valve  (prior to the fi lter/drier) while the unit is running, 
ini ti at ing a unit pump-down. The unit will shut off when 
the mechanical low-pres sure switch opens. When the 
unit shuts down, close the ball valve located after the 
fi lter/drier and remove power from the unit to prevent 
the unit from running. Once the fi lter/drier core has been 
replaced, the fi lter/drier section should be evacuated via 
the Schrader ac cess valve located next to the fi lter/drier 
prior to open ing the ball valves and restoring the unit 
to normal op er a tion.   

The forward curved fan wheel must be re moved through 
the fan discharge open ing.  The  lo ca tion  of  other  clamps, 
fan wheel, and shaft must be marked so each of these 
com po nents  can  be  re as sem bled in the same location 
- see Figure 4-4. This will preserve the bal ance of the 
ro tat ing  as sem bly.  Pro ceed  with  the  fol low ing  steps:

  1. Disconnect all duct work or guards at tached to the 

blower housing to permit unobstructed ac cess.

  2. Remove the cut off plate at tached at the dis charge 

or blast area of the blower housing.

  3. Thoroughly clean the shaft of all grease and rust 

inhibitor. Be careful not to con tam i nate  the  bear ing 
grease. Use emery cloth to re move all rust or the 
wheel may become “locked” to the shaft.

 4. Loosen and remove set screws on both bear ing 

lock ing  collars.  In spect and, if necessary, re-
 place.

  5. Loosen and remove set screws from both sides of 

the wheel hub. Inspect and, if necessary, re place.

  6. Using a rubber mallet or brass bar, slow ly drive 

the shaft in one direction until the set screw marks 
on the shaft are fully ex posed. File the marks 
com plete ly smooth. Drive the shaft in the opposite 
di rec tion  and  fi le smooth the set screw marks. Con-
 tin ue to clean the shaft of all dirt and residuals.

  7. To remove the key, use a rub ber mal let or brass bar 

to drive the shaft and wheel in one di rec tion.  Drive 
the key in the op po site  di rec tion  us ing  a  nail  set  or 
small er size key stock until the key is com plete ly 
free of the wheel. Be sure that key does not get 
bent by al low ing it to ride up the key way edge. 
The slightest bend will prevent quick as sem bly. 
Should this occur, re place the key stock.

 8. Remove the shaft, supporting the weight of the 

wheel, particularly for larger di am e ter  wheels.  Do 
not al low the weight of the shaft to be sup port ed 
by one bearing as you dis as sem ble.

  9. Remove the wheel through the dis charge or outlet 

area of the blower hous ing.

 10.  Reassemble in reverse order, cen ter ing  the  wheel 

between the edges of the inlet ven turi. If bearings 
were removed or re placed, be sure to re use any 
shim stock found be tween the mount ing support/
plate and bearing hous ings.

 11.  Torque all hardware.

LD06355

LD06355