Carrier AQUASNAP 30RB060-390 Controls, Start-Up, Operation, Service And Troubleshooting Instructions page 67

MC
ERROR MASTER SLAVE
CODE
01 X X
02 X
03 X
04 X
05 X
06 X
07 X
08 X
09 X X
10 X X
11 X
12 X X
13 X
LEGEND
EWT — Entering Water Temperature
LWT — Leaving Water Temperature
Possible Causes — If this condition is encountered, check the
following items:
• Check the sensor wiring to Main Base Board (P.05 and
P.06) or Fan Board 3 (P.07).
• Check the board for a faulty channel.
• Check for a faulty transducer.
• Check cooler water flow.
• Check loop volume.
• Check EXV operation.
• Check for a liquid line refrigerant restriction, filter drier,
service valve, etc.
• Check the refrigerant charge.
• 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 option (Configuration

SERV FLUD=2) to utilize the brine freeze point
instead of 34 F (1.1 C).
High Superheat
P.08 — Circuit A
P.09 — Circuit B
P.10 — Circuit C
Criteria for Trip — The criteria are tested whether the circuit is
ON. This alarm is generated if all of the following criteria are
met:
1. The EXV position is equal to or greater than 98%.
2. The circuit's Suction Superheat (Suction Gas Tempera-
ture – Saturated Suction Temperature) is greater than 54 F
(30.0 C).
3. The circuit's Saturated Suction Temperature is less than
Maximum Operating Pressure (MOP) set point (Config-
 
uration SERV MOP) for more than 5 minutes.
Action to be Taken — The circuit is shut down normally.
Reset Method — Manual.
Possible Causes — If this condition is encountered, check the
following items:
• Check the suction pressure transducer wiring to Main
Base Board (P.08 and P.09) or Fan Board 3 (P.10).
• Check the board for a faulty channel.
• Check for a faulty transducer.
• Check the suction gas thermistor wiring to EXV Board 1
(P.08 and P.09) or to EXV Board 2 (P.10)
• Check the suction gas thermistor sensor for accuracy.
Table 43 — Master/Slave Alarm Code
The master or slave water pump is not configured while the control of the lag unit pump is required
(lag_pump = 1)
Master and slave units have the same network address.
There is no slave configured at the slave address
Slave pump_seq incorrect configuration
There is a conflict between the master and the slave LWT option: the master is configured for EWT control
while the slave is configured for LWT control.
There is a conflict between the master and the slave LWT option: the master is configured for LWT control
while the slave is configured for EWT control.
There is a conflict between the master and the slave pump option: the master is configured for lag pump
control while the slave is not configured for lag pump control.
There is a conflict between the master and the slave pump option: the master is not configured for lag pump
control while the slave is configured for lag pump control.
The slave chiller is in local or remote control (chilstat = 3)
The slave chiller is down due to fault (chilstat = 5)
The master chiller operating type is not Master: master_oper_typ and master_status = off
No communication with slave.
Master and slave heat/cool status are not the same.

DESCRIPTION
• Check for EXV Board 1 (P.08 and P.09) or EXV Board 2
(P.10) faulty channel.
• Check EXV operation.
• Check for a liquid line refrigerant restriction, filter drier,
service valve, etc.
• Check the refrigerant charge.
Low Superheat
P.11 — Circuit A
P.12 — Circuit B
P.13 — Circuit C
Criteria for Trip — The criteria are tested whether the circuit is
ON. This alarm is generated if the following criterion is met:
The EXV position is equal to or less than 5% and the cir-
cuit's Suction Superheat (Suction Gas Temperature – Saturated
Suction Temperature) is less than the Suction Superheat Set
Point (Configuration

SERV SHP.B, or Configuration
least 5° F (2.8° C) or the circuit Saturated Suction Temperature
is greater than Maximum Operating Pressure (MOP) set point

(Configuration SERV
Action to be Taken — The circuit is shut down normally.
Reset Method — Automatic, first occurrence in 24 hours.
Manual, if more than one occurrence in 24 hours.
Possible Causes — If this condition is encountered, check the
following items:
• Check the suction pressure transducer wiring to Main
Base Board (P.11 and P.12) or Fan Board 3 (P.13).
• Check the board for a faulty channel.
• Check for a faulty transducer.
• Check the suction gas thermistor wiring to EXV Board 1
(P.08 and P.09) or to EXV Board 2 (P.10)
• Check the suction gas thermistor sensor for accuracy.
• Check for EXV Board 1 (P.11 and P.12) or EXV Board 2
(P.13) faulty channel.
• Check EXV operation.
• Confirm Maximum Operating Pressure Set Point.
• Check the refrigerant charge.
P.14 — Cooler Interlock Failure
Criteria for Trip — The criteria are tested whether the unit is
ON or OFF. This algorithm monitors the cooler flow switch
circuit, which may include field-installed cooler pump
interlock (PMPI) contacts. The pump interlock and flow
switch are wired in series, therefore either device can cause a
67
 
SERV SHP.A, Configuration
 
SERV SHP.C) by at

MOP) for more than 5 minutes.
