Carrier PIC 5+ - Electronic Document; Hydraulic Option Control

32

PIC 5+ controller provides online electronic documents.
Users can view the electronic edition of User Manual online
via computer.
See the following picture, click the button with wrech icon
will lead you to user manual for chiller control. Click the
button with question mark will lead you to user manual for
Bacnet.

5.36.1 - Water Flow Measurement
PIC 5+ Controller provides the function of measuring water
ow rate.
It can compute the water ow rate from the input signal sent
from the evaporator/condenser water ow sensor (4-20ma)
to the IOB if water ow meter is installed.
• Step 1: Set ”Factory Parameters” -> ”IOB4 Option” as
”Yes”.
• Step 2: Set ”Option Conguration” -> ”Water Flow
Measurement” as ”Flow Meter”, and the corresponding
value of Water Flow at 4ma and 20ma.
• Step 3: In ”Inputs Status” menu, conrm that evaporator/
condenser water ow sensor is working and giving
correct readings.
• Step 4: In ”Hydraulic Status” menu, check evaporator/
condenser water ow rate value.(The ow rate value
will be linear interpolated by actual reading and
congured water ow rate at 4ma/20ma)
It also can compute the water ow rate from the water
pressure drop which is get from water pressure sensors or
water pressure drop sensors
• Step 1: Set ”Factory Parameters” -> ”IOB4 Option” as
”Yes”.
• Step 2: Set ”Option Conguration” -> ”Water Flow
Measurement” as ”Water PD”, and the corresponding
value of Evap/Cond Flow Rate Baseline and Evap/Cond
Pressure Drop Baseline.
• Step 3: See 5.34.2 for water pressure difference setting.
• Step 4: In ”Hydraulic Status” menu, check evaporator/
condenser water ow rate value.
If water ow switch is installed, then the water ow switch
status will directly indicate the ow status
• Step 1: Set ”Factory Parameters” -> ”IOB4 Option” as
”Yes”.
• Step 2: Set ”Option Conguration” -> ”Water Flow
Determination” as ”Flow Switch”
• Step 3: In ”Hydraulic Status” menu, check evaporator/
condenser water ow.
5.36.2 - Water Pressure Difference Measurement
PIC 5+ Controller provides the function of measuring water
pressure difference. When entering and leaving water
pressure transducer is installed, or when water pressure drop
transducer is installed, PIC 5+ can compute or read the water
pressure difference between entering and leaving water
pressure, and determine whether the water is owing. After
the water pump is switched on, if the water pressure
difference reachs the threshold, the water ow check is
passed, then the chiller can start. Otherwise there will be an
alarm shutdown.
For entering and leaving water pressure transducer:
• Step 1: Set ”Factory Parameters” -> ”IOB4 Option” as
”Yes”.
• Step 2: Set ”Option Conguration” -> ”Water Pressure
Option” as ”Pressure”.
• Step 3: In ”Hydraulic Status” menu, check Condenser
Water Delta P, Condenser Water Flow, Evaporator Water
Delta P, Evaporator Water Flow
For water pressure drop transducer:
• Step 1: Set ”Factory Parameters” -> ”IOB4 Option” as
”Yes”.
• Step 2: Set ”Option Conguration” -> ”Water Pressure
Option” as ”Pressure Drop”.
• Step 3: Set ”Option Conguration” -> ”Water Pressure
Drop @20mA” the rated value of the transducer.
• Step 4: In ”Hydraulic Status” menu, check Condenser
Water Delta P, Condenser Water Flow, Evaporator Water
Delta P, Evaporator Water Flow