67
Table 43 — Master/Slave Alarm Code
LEGEND
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.
• 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.A
,
Configuration
SERV
SHP.B
, or
Configuration
SERV
SHP.C
) by at
least 5° F (2.8° C) or the circuit Saturated Suction Temperature
is greater than Maximum Operating Pressure (MOP) set point
(
Configuration
SERV
MOP
) for more than 5 minutes.
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
MC
ERROR
CODE
MASTER
SLAVE
DESCRIPTION
01
X
X
The master or slave water pump is not configured while the control of the lag unit pump is required
(
lag_pump = 1
)
02
X
Master and slave units have the same network address.
03
X
There is no slave configured at the slave address
04
X
Slave
pump_seq
incorrect configuration
05
X
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.
06
X
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.
07
X
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.
08
X
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.
09
X
X
The slave chiller is in local or remote control (
chilstat = 3
)
10
X
X
The slave chiller is down due to fault (
chilstat = 5
)
11
X
The master chiller operating type is not Master:
master_oper_typ
and
master_status = off
12
X
X
No communication with slave.
13
X
Master and slave heat/cool status are not the same.
EWT —
Entering Water Temperature
LWT —
Leaving Water Temperature
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...