Carrier AQUASNAP 30RAP010-150 Controls, Start-Up, Operation, Service, And Troubleshooting page 72

If the unit is in alarm and unable to operate, Control Mode
(STAT) = 4 (Off Emrgcy).
Automatic alarms will reset without operator intervention if
the condition corrects itself. The following method must be
used 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 until the sub-menu item RCRN "RESET
ENTER
SYMPTOMS
Cooler Circulating Pump Does
Not Run
Compressor Cycles
Off on Loss of Charge
Compressor Cycles Off on Cooler
Freeze Protection
Compressor Shuts Down on
High-Pressure Control
Unit Operates Too Long
or Continuously
Unusual or Loud System
Noises
Compressor Loses Oil
Hot Liquid Line
Frosted Liquid Line
Frosted Suction Line
Freeze-Up
Table 35 — Troubleshooting
CAUSE
Power line open
Control fuse or circuit breaker open
Tripped power breaker
Loose terminal connection
Improperly wired controls
Low line voltage
Pump motor defective
Pump seized
Low refrigerant charge
Thermistor failure
System load was reduced faster than controller could
remove stages
High-pressure control acting erratically
Noncondensables in system
Condenser dirty
Fans not operating
System overcharged with refrigerant
Low refrigerant charge
Control contacts fused
Partially plugged or plugged expansion valve or filter drier
Defective insulation
Damaged compressor
Piping vibration
Compressor noisy
Leak in system
Mechanical damage (Failed seals or broken scrolls)
Oil trapped in line
Shortage of refrigerant due to leak
Restricted filter drier
Expansion valve admitting excess refrigerant (note: this is a
normal condition for brine applications)
Stuck EXV
Improper charging
System not drained for winter shutdown
Loose Thermistor
ALL CURRENT ALARMS" is displayed. Press
The control will prompt the user for a password, by displaying
PASS and WORD. Press
password, 1111. Press
word has been changed, use the arrow keys to change each in-
dividual character. Toggle the display to "YES" and press
. The alarms will be reset.
ENTER
Reset circuit breaker.
Check control circuit for ground or short. Reset breaker and
replace fuse.
Check the controls. Find the cause of trip and reset breaker.
Check connections.
Check wiring and rewire if necessary.
Check line voltage — determine location of
voltage drop and remedy deficiency.
Check motor winding for open or short.
Replace compressor if necessary.
Replace pump.
Repair leak and recharge.
Replace thermistor.
Unit will restart after fluid temperature rises back into the
control band. Avoid rapidly removing system load.
Replace control.
Evacuate and recharge.
Clean condenser.
Repair or replace if defective.
Reduce charge.
Add refrigerant.
Replace control.
Clean or replace as needed.
Replace or repair as needed.
Check compressor and replace if necessary.
Support piping as required.
Check for loose pipe connections or damaged compressor
Replace compressor (worn bearings).
Check for loose compressor holddown bolts.
Repair leak.
Replace compressor.
Check piping for oil traps.
Repair leak and recharge.
Replace filter drier.
Replace valve if defective.
Replace valve if defective.
Make sure a full quantity of fluid is flowing through the cooler
while charging, and suction pressure in cooler is equal to or
greater than pressure corresponding to 32 F (0° C).
Recommended that system be filled with an appropriate gly-
col mixture to prevent freezing of pumps and fluid tubing.
Verify thermistors are fully inserted in wells.
72
to display the default
ENTER
for each character. If the pass-
ENTER
REMEDY
.
ENTER