PKG-SVX027D-EN
75
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.
Semi-Annual Maintenance
WARNING
Rotating Components!
Failure to disconnect power before servicing could
result in rotating components cutting and slashing
technician which could result in death or serious
injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized.
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.
Note: 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.
Maintenance
To Next Page
Loading...
Need help?
General
