Carrier AQUASNAP 30RB060-390 Controls, Start-Up, Operation, Service And Troubleshooting Instructions page 66

Possible Causes — If this condition is encountered, check the
following items:
• Check the power supply to heat reclaim board.
• Check the Local Equipment Network (LEN) wiring to be
sure that it is connected properly.
• Check unit configuration to be sure that Heat Reclaim is
enabled and unit does NOT contain the Heat Reclaim
option.
Welded Contactor Failure
Ct.01 – Circuit A
Ct.02 – Circuit B
Ct.03 – Circuit C
Criteria For Trip — This alarm is tested for when the circuit is
off (all compressors switched to off). The algorithm will evalu-
ate saturated suction and saturated condensing temperatures to
determine if the compressor is still running even though it has
been commanded off.
Action to be Taken
1. Unit capacity will go to and remain at 0%. The EXV, fan
control, and cooler pump will continue their normal oper-
ation.
2. If a high pressure, cooler flow, or cooler freeze failure oc-
curs, then circuit operation is disabled. The critical alarm
relay will be energized in order to shut off the main power
supply.
Reset Method — Reset is manual.
FC.n0 — Initial Factory Configuration Required
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. The alarm will be generated if the Configuration
 
UNIT TONS=0.
Action to be Taken — The unit is not allowed to start.
Reset Method — Automatic after factory configuration is com-
plete. The configuration must be manually completed. The
password may default to 0113.
Possible Causes — If this condition is encountered, confirm
the unit configuration.
FC.nn — Illegal Configuration
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. The alarm will be generated if the one of the fol-
lowing configuration errors is detected by the control. The
"nn" refers to the error code listed in Table 42.
Table 42 — Illegal Configuration Alarm Code
FC
ERROR
CODE
01 Unit size is unknown.
02 Reclaim option selected for Heat Pump machine.
Hot Gas Bypass configured for a Heat Pump
03
machine.
Number of Fans controlled by Motormaster
04
trol is greater than expected.
Action to be Taken — The unit is not allowed to start.
Reset Method — Automatic after factory reconfiguration is
completed. A power cycle may be required.
Possible Causes — If this condition is encountered, confirm
the unit configuration.
MC.nn — Master Chiller Configuration Error
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. The units must be configured as a Master and
DESCRIPTION
® con-
Slave machine (Configuration
 
figuration RSET MSSL=2), and one of the following
configuration errors has been found. The "nn" refers to the
error code listed in Table 43.
Action to be Taken — Unit not allowed to start in Master Slave
control.
Reset Method — Automatic
Possible Causes — If this condition is encountered, confirm
proper configuration.
P.01 — Water Exchanger Freeze Protection
Criteria for Trip — The alarm criteria are checked whether the
unit is ON or OFF. If the entering or leaving water thermistor
senses a temperature at the freeze point or less, the alarm will
be generated. For a fresh water system (Configuration
 
SERV FLUD=1), the freeze point is 34 F (1.1 C).
For medium temperature brine systems (Configuration
 
SERV FLUD=2), the freeze point is Brine Freeze Set

Point (Configuration
Action to be Taken — Unit shut down or not allowed to start.
Chilled water pump will be started.
Reset Method — Automatic, first occurrence in 24 hours if
LWT rises to 6° F (3° C) above set point. Manual, if more than
one occurrence in 24 hours.
Possible Causes — If this condition is encountered, check the
following items:
• Check the entering and leaving fluid thermistors for
accuracy.
• Check the water flow rate.
• Check loop volume. Low loop volume at nominal flow
rates can in extreme cases bypass cold water to the
cooler.
• Check for freezing conditions.
• Check heater tape and other freeze protection items for
proper operation.
• Check glycol concentration and adjust LOSP accord-
ingly.
• If the Leaving Water Set Point is above 40 F (4.4 C) and
there is glycol in the loop, consider using the Medium
Temperature Brine
 
SERV FLUD=2) to utilize the brine freeze point
instead of 34 F (1.1 C).
Low Suction Temperature
P.05 — Circuit A
P.06 — Circuit B
P.07 — Circuit C
Criteria for Trip — The criteria are tested whether the circuit is
ON. This alarm is generated if one of the following criteria is
met:
• If the circuit Saturated Suction Temperature is below
–13 F (–25 C) for more than 30 seconds.
• If the circuit Saturated Suction Temperature is below
–22 F (–30 C) for more than 8 seconds.
• If the circuit Saturated Suction Temperature is below
–40 F (–40 C) for more than 3 seconds.
Action to be Taken — The circuit is shut down immediately.
Prior to the alarm trip, the control will take action to avoid
the alarm. See Operating Modes 21, 22 and 23 on page 48.
• Reset Method — Automatic, first occurrence in 24 hours.
Manual, if more than one occurrence in 24 hours.
66
 
RSET MSSL=1 and Con-

SERV LOSP).
option (Configuration