Refrigerant Filter —
A replaceable core refrigerant filter/
drier, located on the refrigerant cooling line to the motor,
(Fig. 2) should have the core changed once a year, or more
often if filter condition indicates a need for more frequent
replacement. Change the filter with the machine pressure at
0 psig (0 kPa) by transferring the refrigerant to the utility
vessel. A moisture indicating sight glass is located beyond
this filter to indicate the volume and moisture in the refrig-
erant. If the moisture indicator (dry-eye) indicates moisture,
locate the source of water immediately by performing a thor-
ough leak check.
Change Refrigerant Filter or Strainer —
With ma-
chine refrigerant evacuated and the pressure at 0 psig
(0 kPa), change refrigerant filter or strainer yearly, or more
often if filter or strainer condition indicates a need for more
frequent replacement.
Inspect Refrigerant Float System —
The refrig-
erant float system must be inspected every 5 years or when
machine is opened for service.
Transfer refrigerant into storage tanks. Remove float cham-
ber access covers on economizer. Clean each chamber and
valve assembly thoroughly. Be sure that float valves move
freely. See that orifices, vent, drain, and control connections
are free from obstructions. Examine cover gaskets and re-
place if necessary.
Inspect Relief Valves and Piping —
The relief valves
on this machine protect the system against the potentially
dangerous effects of overpressure. To ensure against damage
to the equipment and possible injury to personnel, these de-
vices must be kept in peak operating condition.
As a minimum, the following maintenance is required.
1. At least once a year, disconnect the vent piping at the
valve outlet and carefully inspect the valve body and mecha-
nism for any evidence of internal corrosion or rust, dirt,
scale, leakage, etc.
2. If corrosion or foreign material is found, do not attempt
to repair or recondition. Replace the valve.
3. If the machine is installed in a corrosive atmosphere or
the relief valves are vented into a corrosive atmosphere,
make valve inspections at more frequent intervals.
Compressor
Bearing
and
Gear
Mainten-
ance —
The key to good bearing and gear maintenance is
proper lubrication. Use the proper grade of oil, maintained
at recommended level, temperature, and pressure. Inspect the
lubrication system regularly and thoroughly.
Only a trained service technician should remove and
examine the bearings. The bearings and gears should be
examined on a scheduled basis for signs of wear. The fre-
quency of examination is determined by the hours of ma-
chine operation, load conditions during operation, and the
condition of the oil and the lubrication system. Excessive
bearing wear can sometimes be detected through increased
vibration or increased bearing temperature. If either symp-
tom appears, contact an experienced and responsible service
organization for assistance.
Inspect the Heat Exchanger Tubes
COOLER — Inspect and clean the cooler tubes at the end of
the first operating season. Because these tubes have internal
ridges, a rotary-type tube cleaning system is necessary to fully
clean the tubes. Upon inspection, the tube condition will de-
termine the scheduled frequency for cleaning, and will in-
dicate whether water treatment is adequate in the chilled water/
brine circuit. Inspect the entering and leaving chilled water
temperature sensors for signs of corrosion or scale. Replace
the sensor if corroded or remove any scale if found.
CONDENSER — Since this water circuit is usually an open-
type system, the tubes may be subject to contamination and
scale. Clean the condenser tubes with a rotary tube cleaning
system at least once per year, and more often if the water is
contaminated. Inspect the entering and leaving condenser wa-
ter sensors for signs of corrosion or scale. Replace the sen-
sor if corroded or remove any scale if found.
Higher than normal condenser pressures, together with the
inability to reach full refrigeration load, usually indicate dirty
tubes or air in the machine. If the refrigeration log indicates
a rise above normal condenser pressures, check the con-
denser refrigerant temperature against the leaving condenser
water temperature. If this reading is more than what the de-
sign difference is supposed to be, then the condenser tubes
may be dirty, or water flow may be incorrect. Because HFC-
134a is a high-pressure refrigerants, air usually does not en-
ter the machine.
During the tube cleaning process, use brushes especially de-
signed to avoid scraping and scratching the tube wall. Con-
tact your Carrier representative to obtain these brushes. Do
not use wire brushes.
Hard scale may require chemical treatment for its pre-
vention or removal. Consult a water treatment specialist
for proper treatment.
Water Leaks —
Water is indicated during machine
operation by the refrigerant moisture indicator (dry-eye)
(Fig. 2) on the refrigerant motor cooling line. Water leaks
should be repaired immediately.
Machine must be dehydrated after repair of water leaks.
See Machine Dehydration section, page 37.
Water Treatment —
Untreated or improperly treated wa-
ter may result in corrosion, scaling, erosion, or algae. The
services of a qualified water treatment specialist should be
obtained to develop and monitor a treatment program.
Water must be within design flow limits, clean, and treated
to ensure proper machine performance and reduce the
potential of tubing damage due to corrosion, scaling, ero-
sion, and algae. Carrier assumes no responsibility for
chiller damage resulting from untreated or improperly
treated water.
Inspect the Starting Equipment —
Before work-
ing on any starter, shut off the machine, and open all dis-
connects supplying power to the starter.
The disconnect on the starter front panel does not de-
energize all internal circuits. Open all internal and re-
mote disconnects before servicing the starter.
Never open isolating knife switches while equipment is
operating. Electrical arcing can cause serious injury.
Inspect starter contact surfaces for wear or pitting on
mechanical-type starters. Do not sandpaper or file silver-
plated contacts. Follow the starter manufacturer’s instruc-
tions for contact replacement, lubrication, spare parts order-
ing, and other maintenance requirements.
52
Summary of Contents for 19EF Series
Page 10: ...Fig 5 19EF Controls and Sensor Locations cont 10...
Page 13: ...Fig 12 19EF Menu Structure 13...
Page 14: ...Fig 13 19EF Service Menu Structure 14...
Page 38: ...Fig 24 19EF Leak Test Procedures 38...
Page 69: ...Fig 36 Electronic PIC Controls Wiring Schematic 69...
Page 70: ...Fig 36 Electronic PIC Controls Wiring Schematic cont 70...
Page 71: ...Fig 37 Machine Power Panel Starter Assembly and Motor Wiring Schematic 71...
