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PREVENTATIVE MAINTENANCE
UNITROL MODEL 8400, 8401, 8406, 8450, 8451, 8456
ONLY A CERTIFIED REFRIGERATION TECHNICIAN SHOULD BE ALLOWED TO SERVICE
THE SEALED REFRIGERATION SECTION OF THIS CHILLER
CLEAN THE CONDENSER: Inspect the evaporator coil fins (behind the air intake filter) every 3
months of operation. If there is evidence of dirt or grease buildup, clean the evaporator fins
using an outside water hose. Flush as much of the trapped debris as possible from between the
fins.
If there is too much buildup for reasonable cleaning, use a commercially available aluminum fin
spray solvent such as Nonacid condenser coil cleaner, W.W. Grainger #5W403. Follow
directions on the product label.
WATER TANK CLEANING: Remove the cover of the water tank once every 6 months and
inspect to see if there is a large buildup of material in the water. Remove as much material as
possible. Clean the water float. Silt at the bottom of the water tank is normal.
OTHER MAINTENANCE:
Bearings on the water pump are sealed and do not require periodic oil or grease.
There are no other periodic service components in the system.
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