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57
SYSTEM BURNOUT CLEANUP PROCEDURE — Some
compressor electrical failures can cause the motor to burn.
When this occurs, byproducts such as sludge, carbon, and
acids contaminate the system. There are 2 classifications of
motor burnouts, mild and severe. Test the oil for acidity using a
POE oil acid test kit to determine the severity of the burnout.
In a mild burnout, there is little or no detectable odor.
Compressor oil is clear or slightly discolored. An acid test of
the oil will be negative. This type of failure is treated the same
as a mechanical failure. The liquid line filter drier or core
should be replaced.
In a severe burnout, there is a strong, pungent, rotten egg
odor. Compressor oil is very dark. Evidence of burning may be
present in the tubing connected to the compressor. An acid test
of the oil will be positive. The following steps should be taken
before restarting any compressors in the circuit.
1. Isolate compressors and recover refrigerant from com-
pressor section.
2. Remove oil from all compressors in the circuit. An oil
drain plug is provided on each compressor. Pressurize the
low side of the compressor circuit with nitrogen. Less
than 10 psig (68.9 kPa) should be adequate. This will help
in the removal of the oil from the compressor sump. Dis-
pose of contaminated oil as per local codes and
regulations.
3. Replace failed compressor as outlined under compressor
replacement procedure.
4. Recharge the circuit with fresh oil. The circuit oil charge
information is supplied in the 30RB Installation Instruc-
tions. Oil level should be approximately
7
/
8
sight glass.
5. Install activated carbon (burnout) filter drier/core.
6. Leak check, evacuate and recharge refrigerant circuit.
7. Operate compressors. Check filter drier pressure drop
periodically. Replace cores if pressure drop exceeds
4 psig (27.6 kPa).
Perform additional acid test after 24 hours of operation.
Change liquid line filter drier/core if necessary. Replace with
standard filter drier/core once circuit is clean. Use the Carrier
Standard Service Techniques Manual as a reference source.
MAINTENANCE
Recommended Maintenance Schedule —
The fol-
lowing are only recommended guidelines. Jobsite conditions
may dictate that maintenance schedule is performed more often
than recommended.
Routine:
For machines with e-coat condenser coils:
• Check condenser coils for debris, clean as necessary with
Carrier approved coil cleaner.
• Periodic clean water rinse, especially in coastal and
industrial applications.
Every month:
• Check condenser coils for debris, clean as necessary with
Carrier approved coil cleaner.
• Check moisture indicating sight glass for possible refrig-
erant loss and presence of moisture.
Every 3 months (for all machines):
• Check refrigerant charge.
• Check all refrigerant joints and valves for refrigerant
leaks, repair as necessary.
• Check chilled water flow switch operation.
• Check condenser coils for debris, clean as necessary with
Carrier approved coil cleaner.
• Check sight glass moisture indicator for moisture.
• Check all condenser fans for proper operation.
• Check compressor oil level.
• Check crankcase heater operation.
• Inspect pump seal, if equipped with a hydronic pump
package.
Every 12 months (for all machines):
• Check all electrical connections, tighten as necessary.
• Inspect all contactors and relays, replace as necessary.
• Check accuracy of thermistors, replace if greater than
±2° F (1.2° C) variance from calibrated thermometer.
• Check accuracy of transducers, replace if greater than
±5 psi (34.47 kPa) variance.
• Check to be sure that the proper concentration of anti-
freeze is present in the chilled water loop, if applicable.
• Verify that the chilled water loop is properly treated.
• Check refrigerant filter driers for excessive pressure
drop, replace as necessary.
• Check chilled water strainers, clean as necessary.
• Check cooler heater operation, if equipped.
• Check condition of condenser fan blades and that they
are securely fastened to the motor shaft.
• Perform Service Test to confirm operation of all
components.
Check for excessive cooler approach (Leaving Chilled
Water Temperature – Saturated Suction Temperature) which
may indicate fouling. Clean cooler vessel if necessary.
TROUBLESHOOTING
See Table 40 for an abbreviated list of symptoms, possible
causes and possible remedies.
Alarms and Alerts —
The integral control system con-
stantly monitors the unit and generates warnings when abnor-
mal or fault conditions occur. Alarms may cause either a circuit
(Alert) or the whole machine (Alarm) to shutdown. Alarms and
Alerts are assigned codes as described in Fig. 33. The alarm/
alert indicator LED on the scrolling marquee or Navigator™
module is illuminated when any alarm or alert condition is
present. If an Alert is active, the Alarm Indicator LED will
blink. If an Alarm is active, the Alarm Indicator LED will
remain on. Currently active Alerts and Alarms can be found in
Alarms
ALRM
ALM1
to
ALM5
.
The controller generates two types of alarms. Automatic
reset alarms will reset without any intervention if the condition
that caused the alarm corrects itself. Manual reset alarms
require the service technician to check for the alarm cause and
reset the alarm. The following method must be followed to
reset manual alarms:
Before resetting any alarm, first determine the cause of the
alarm and correct it. Enter the Alarms mode indicated by the
LED on the side of the scrolling marquee display. Press
and sub-mode
Alarm
R.ALM
(Reset All Current
Alarms) is displayed. Press
. The control will prompt
the user for a password, by displaying PASS and WORD. Press
to display 1111. Press
for each character.
The default password is 0111. Use the arrow keys to change
each individual character. Use the up or down arrow keys to
toggle the display to
YES
and press
. The alarms will
be reset. Indicator light will be turned off when switched
correctly. Do not reset the chiller at random without first inves-
tigating and correcting the cause(s) of the failure.
Each alarm is described by a three or four-digit code. The
first one or two digits indicate the alarm source and are listed
below. The last two digits pinpoint the problem. See Table 41.
ENTER
ENTER
ENTER
ENTER
ENTER
Summary of Contents for AQUASNAP 30RBA315
Page 77: ...77 Fig 37 Control Schematic 30RB060 080 a30 4619...
Page 78: ...78 Fig 38 Control Schematic 30RB090 150 a30 4620...
Page 79: ...79 Fig 39 Control Schematic 30RB160 190 a30 4622...
Page 80: ...80 Fig 40 Control Schematic 30RB210 300 a30 4622...
Page 81: ...81 Fig 41 Heat Reclaim Control Schematic a30 4622...