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Check Oil Charge —
Compressors are factory charged
with oil as shown in Table 31.
Table 31 — Oil Charge
If oil is visible in the compressor sight glass, check unit for
operating readiness as described in Pre-Start-Up, System
Check section (page 74), then start the unit. Observe oil level
and add oil if required, to bring oil level in compressor
crankcase up to between
1
/
4
and
3
/
4
of sight glass during steady
operation.
To Add Oil:
1. Check the oil level with all compressors in the circuit run-
ning in a stabilized condition or immediately after com-
pressor shutdown. The oil level should be at
1
/
3
of the oil
sight glass immediately after shutdown.
2. Using a suitable pump, add oil while compressor(s) are
running through the low side ¼ in. Schraeder fitting on
the compressor. For SM110 models, this fitting is directly
above the suction line connection. For all other compres-
sor models, this fitting is near the oil equalization line fit-
ting at the same height as the suction line connection.
3. Run all compressors on the circuit for at least 15 minutes
and check the oil level.
Use only Sterling-approved compressor oil:
Totaline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PP680002
Penreco . . . . . . . . . . . . . . . . . . . . . . . . . . . .Sontex 160 LT-A
Do not reuse drained oil, and do not use any oil that has
been exposed to the atmosphere.
Condenser Section and Coils
COIL CLEANING — For standard aluminum, copper and
pre-coated aluminum fin coils, clean the coils with a vacuum
cleaner, fresh water, compressed air, or a bristle brush (not
wire). Units installed in corrosive environments should have
coil cleaning as part of a planned maintenance schedule. In this
type of application, all accumulations of dirt should be cleaned
off the coil. When condenser cleaning is complete, enter “Yes”
for coil cleaning maintenance done (CL.MN) value under Run
Status.
CLEANING E-COATED COILS — Follow the outlined pro-
cedure below for proper care, cleaning and maintenance of
E-coated aluminum or copper fin coils:
Coil Maintenance and Cleaning Recommendations
— Rou-
tine cleaning of coil surfaces is essential to maintain proper
operation of the unit. Elimination of contamination and
removal of harmful residues will greatly increase the life of the
coil and extend the life of the unit.
Remove Surface Loaded Fibers
— Surface loaded fibers or
dirt should be removed with a vacuum cleaner. If a vacuum
cleaner is not available, a soft brush may be used. In either
case, the tool should be applied in the direction of the fins. Coil
surfaces can be easily damaged (fin edges bent over) if the tool
is applied across the fins.
NOTE: Use of a water stream, such as a garden hose, against a
surface loaded coil will drive the fibers and dirt into the coil.
This will make cleaning efforts more difficult. Surface loaded
fibers must be completely removed prior to using low velocity
clean water rinse.
Periodic Clean Water Rinse
— A periodic clean water rinse is
very beneficial for coils that are applied in coastal or industrial
environments. However, it is very important that the water
rinse is made with very low velocity water stream to avoid
damaging the fin edges. Monthly cleaning as described below
is recommended.
Routine Cleaning of Coil Surfaces
— Monthly cleaning with
Environmentally Sound Coil Cleaner is essential to extend the
life of coils. It is recommended that all coils, including stan-
dard aluminum, pre-coated, copper/copper or E-coated coils
are cleaned with the Environmentally Sound Coil Cleaner as
described below. Coil cleaning should be part of the units regu-
larly scheduled maintenance procedures to ensure long life of
the coil. Failure to clean the coils may result in reduced dura-
bility in the environment.
Environmentally Sound Coil Cleaner is non-flammable,
hypo allergenic, non-bacterial, USDA accepted biodegradable
and 100% ecologically safe agent that will not harm the coil or
surrounding components such as electrical wiring, painted
metal surfaces or insulation. Use of non-recommended coil
cleaners is strongly discouraged since coil and unit durability
could be affected.
Environmentally Sound Coil Cleaner Application
Equipment
•2
1
/
2
Gallon Garden Sprayer
• Water Rinse with Low Velocity Spray Nozzle
Environmentally Sound Coil Cleaner Application
Instructions
• Although Environmentally Sound Coil Cleaner is harm-
less to humans, animals, and marine life, proper eye pro-
tection such as safety glasses is recommended during
mixing and application.
• Remove all surface loaded fibers and dirt with a vacuum
cleaner as described above.
• Thoroughly wet finned surfaces with clean water and a
low velocity garden hose being careful not to bend fins.
• Mix Environmentally Sound Coil Cleaner in a 2
1
/
2
gallon
garden sprayer according to the instructions included
with the Enzyme Cleaner. The optimum solution tem-
perature is 100 F.
NOTE: DO NOT USE
water in excess of 130 F as the enzy-
matic activity will be destroyed.
• Thoroughly apply Environmentally Sound Coil Cleaner
solution to all coil surfaces including finned area, tube
sheets and coil headers.
• Hold garden sprayer nozzle close to finned areas and
apply cleaner with a vertical, up-and-down motion.
Avoid spraying in horizontal pattern to minimize poten-
tial for fin damage.
• Ensure cleaner thoroughly penetrates deep into finned
areas.
• Interior and exterior finned areas must be thoroughly
cleaned.
• Finned surfaces should remain wet with cleaning solu-
tion for 10 minutes.
• Ensure surfaces are not allowed to dry before rinsing.
Reapply cleaner as needed to ensure 10-minute satura-
tion is achieved.
COMPRESSOR
AMOUNT
pints (liters)
SM110
5.7 (2.7)
SM115, SM125
6.7 (3.2)
SM160
7.0 (3.3)
SM185
11.6 (5.5)
Do not use high-pressure water or air to clean coils — fin
damage may result.