87 
 
 
Table 20 - PIC 5 – QUICK TEST LIST 
5.9.1 Cooler and condenser pressure transducer and waterside flow device calibration 
(Waterside Device Optional with IOB Inputs Available) — Calibration can be checked by comparing the pressure 
readings  from  the  transducer  to  an  accurate  refrigeration  gage  reading.  The  transducer  can  be  checked  and 
calibrated at 2 pressure points.  
These calibration points are 0 psig (0 kPa) and between 10 psig (68.9 kPa) - 30 psig (206.8 kPa). To calibrate 
these transducers: 
1. Shut down the compressor and the cooler and condenser pumps. 
NOTE: There should be no flow through the heat exchangers. 
 
2. Disconnect the transducer in question from its Schrader fitting for cooler or condenser transducer calibration. 
For pump pressure or bearing pressure or flow device calibration keep transducer in place. 
NOTE: If the cooler or condenser vessels are at 0 psig (0 kPa) atmospheric pressure, the transducers can be 
calibrated for zero without removing the transducer from the vessel. 
 
3. Access the PRESSURE  screen  from the  Main  Menu  and view the  particular transducer  reading (the cooler 
pressure,  condenser  pressure,  economizer  pressure,  pump  inlet  pressure,  pump  outlet  pressure,  bearing  inlet 
pressure, bearing outlet pressure). To calibrate a device, view the particular reading on the screen. It should read 
0  kPa).  If  the  reading  is  not  0  kPa,  but  within  35  kPa,  the  value  may  be  set  to  zero  while  the  appropriate 
transducer parameter is highlighted. The value will now go to zero. No high end calibration is necessary for REF 
PUMP DELTA P or flow devices. If the transducer value is not within the calibration range, the transducer will 
return to the original reading. If the pressure is within the allowed range (noted above), check the voltage ratio of 
the transducer. To obtain the voltage ratio, divide the voltage (dc) input from the transducer by the supply voltage 
signal (See Maintenance Others in Maintenance Menu) or measure across the positive (+ red) and negative (– 
black)  leads  of  the  transducer.  The  voltage  ratio  must  be  between  0.80  and  0.11  for  the  software  to  allow 
calibration. Rotate the waterside flow pressure device from the inlet nozzle to the outlet nozzle and repeat this