25
Hydraulic Option
The 23XR unit can be equipped with two normally open flow
switches; one for the evaporator and the other for the condenser.
The evaporator/condenser water flow will indicate the flow sta-
tus (see wiring schematic). In Option 2, Water Flow Determina-
tion must be set to "1=Flow Switch" for this option to be active.
Connections are 7TB-44/45 for evaporator and 7TB-46/47 for
condenser.
WATER PRESSURE OPTION
When entering and leaving water pressure transducers (Delta P)
are installed, the PIC6 control system can compute or read the wa-
ter pressure difference between entering and leaving water pres-
sure, and thereby determine if the water is flowing. After the water
pump is switched on, if the water pressure difference reaches the
threshold, the water flow check is passed and the chiller can start.
Otherwise there will be an alarm shutdown.
HYDRONICS CONFIGURATION
Flow detection method can be modified in Main Menu
ConfigurationHydronics Configuration. Default selection
is based on water temps.
Evap Flow Detection
0 = Calculated (default)
1=Discrete (Field supplied flow switch)
2=Delta P (Field supplied pressure transducers in inlet and
outlet nozzles)
Cond Flow Detection
0 = Calculated (default)
1= Discrete (Field supplied flow switch)
2=Delta P (Field supplied pressure transducers in inlet and
outlet nozzles)
For flow selection 2 the minimum flow delta P must be configured
for minimum acceptable flow. See Fig. 58.
Fig. 58 — Hydronics Configuration Menu
DIAGNOSTICS AND TROUBLESHOOTING
The 23XRV PIC6 control system has many fault tracing aid func-
tions. The local interface and its various menus give access to all
unit operating conditions.
If an operating fault is detected, an alert or alarm is activated. The
alarm code is displayed in the Alarms menu, sub-menus Reset
alarms and Current alarms. The control displays alarms and alerts
at the bottom of the Home Screen. See Fig. 59. For diagnostics, al-
ways check Current Alarms and History Alarm menus since mul-
tiple alarms may be active at the same time.
Fig. 59 — Example of Alarm on Home Screen
To Next Page
Loading...
