62 KOMAC00607-09EN
Remove filter and clean oil filter housing. Clean all other
components. Replace the o-rings.
Electrical Terminals
!
DANGER
Electric equipment can cause electric shock which will cause severe personal injury or death. Turn off,
lock out and tag all power before continuing with following service. Panels can have more than one
power source.
!
CAUTION
Periodically check electrical terminals for tightness and tighten as required. Always use a back-up
wrench when tightening electrical terminals.
Condensers
The condensers are air-cooled and constructed of 3/8" (9.5mm) OD internally finned copper tubes
bonded in a staggered pattern into louvered aluminum fins. No maintenance is ordinarily required
except the routine removal of dirt and debris from the outside surface of the fins. McQuay
recommends the use of non-caustic, non-acidic, foaming coil cleaners available at most air
conditioning supply outlets. Flush the coil from the inside out.
!
WARNING
Use caution when applying coil cleaners. They can contain potentially harmful chemicals. Wear breathing
apparatus and protective clothing. Thoroughly rinse all surfaces to remove any cleaner residue. Do not
damage the fins during cleaning.
If the service technician has reason to believe that the refrigerant circuit contains
noncondensables, recovery of the noncondensables will be required, strictly following Clean Air
Act regulations governing refrigerant discharge to the atmosphere. The service Schrader valves
are located on both vertical coil headers on both sides of the unit at the control box end of the coil.
Access panels are located at the end of the condenser coil directly behind the control panel.
Recover the noncondensables with the unit off, after shutdown of 15 minutes or longer, to allow
air to collect at the top of the coil. Restart and run the unit for a brief period. If necessary, shut
the unit off and repeat the procedure. Follow accepted environmentally sound practices when
removing refrigerant from the unit.
Liquid Line Sight Glass
Observe the refrigerant sight glasses (one per circuit) weekly. A clear glass of liquid indicates that
there is adequate refrigerant charge in the system to provide proper feed through the expansion
valve.
Bubbling refrigerant in the liquid line sight glass, during stable run conditions, may indicate that
there can be an electronic expansion valve (EXV) problem since the EXV regulates liquid
subcooling. Refrigerant gas flashing in the sight glass could also indicate an excessive pressure
drop in the liquid line, possibly due to a clogged filter-drier or a restriction elsewhere in the liquid
line.
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