Water Leaks; Water Treatment; Inspect The Starting Equipment; Check Pressure Transducers - Carrier 17 Start Up & Operation Manual

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 slime, corrosion, or scale. Replace
the sensor 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
HFC134-a is a high-pressure refrigerant, air usually does not
enter the machine, rather, the refrigerant leaks out.
During the tube cleaning process, use brushes especially
designed 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 in the refrigerant is indicated dur-
ing machine operation by the refrigerant moisture indicator
on the refrigerant motor cooling line (Fig. 8). Water leaks
should be repaired immediately.
Machine must be dehydrated after repair of water leaks.
See Machine Dehydration section, page 51.
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 —
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
ordering, and other maintenance requirements.
Periodically vacuum or blow off accumulated debris on
the internal parts with a high-velocity, low-pressure blower.
Power connections on newly installed starters may relax
and loosen after a month of operation. Turn power off and
retighten. Recheck annually thereafter.
Loose power connections can cause voltage spikes, over-
heating, malfunctioning, or failures.
Check Pressure Transducers —
pressure transducers should be checked against a pressure
gage reading. Check all three transducers: oil pressure, con-
denser pressure, cooler pressure.
Note the evaporator and condenser pressure readings on
the Status01 screen on the LID. Attach an accurate set of
refrigeration gages to the cooler and condenser Schrader fit-
tings. Compare the two readings. If there is a difference in
readings, the transducer can be calibrated, as described in
the Troubleshooting Guide section.
Pumpout System Maintenance —
sor maintenance details, refer to the 06D, 07D Installation,
Start-Up, and Service Instructions.
OPTIONAL PUMPOUT COMPRESSOR OIL CHARGE —
Use oil conforming to Carrier specifications for reciprocat-
ing compressor usage. Oil requirements are as follows:
HFC-134a
ISO Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Carrier Part Number . . . . . . . . . . . . . . . . . . PP23BZ103
The total oil charge, 4.5 pints (2.6 L), consists of
3.5 pints (2.0 L) for the compressor and one additional
pint (0.6 L) for the oil separator.
Oil should be visible in the compressor sight glass both
during operation and at shutdown. Always check the oil
level before operating the compressor. Before adding or chang-
ing oil, relieve the refrigerant pressure as follows:
1. Attach a pressure gage to the gage port of either com-
pressor service valve (Fig. 34).
Before work-
2. Close the suction service valve and open the discharge
line to the storage tank or the machine.
3. Operate the compressor until the crankcase pressure drops
to 2 psig (13 kPa).
4. Stop the compressor and isolate the system by closing
the discharge service valve.
5. Slowly remove the oil return line connection (Fig. 34).
Add oil as required.
6. Replace the connection and reopen the compressor serv-
ice valves.
82
Once a year, the
For compres-