Head Pressure Set-Up - Daikin MicroTech III Operation Manuals

Head Pressure Set-Up

The Head Pressure Set-Up menu contains parameters that are used to maintain head pressure control .
Table 31: Head Pressure Setup Menu
Item Display Name
Wtr Reg Vlv=
Head P Circ 1=
Head P Circ 2=
Setpoint=
Head Press DB=
WRV Period=
WRV Gain=
WRV PAT=
WRV Max Chg=
WRV Init Tm=
Min WRV Pos=
Min WRV Tmp=
Max WRV Tmp=
WRV Act Time=
Min WRV Time=
Wtr Reg Vlv is a status only item that indicates the current
water regulating valve position .
Head P Circ 1 is a status only item that indicates the current
refrigerant pressure for circuit 1 .
Head P Circ 2 is a status only item that indicates the current
refrigerant pressure for circuit 2 .
Setpoint is an adjustable item that sets the refrigerant setpoint
used for controlling the water regulating valve . The water-
regulating valve is modulated to maintain the refrigerant
pressure .
Head Press DB is an adjustable item that sets a deadband
around the Head Pressure Setpoint parameter .
WRV Period is an adjustable item which sets the "sampling
time" used in the PI control function of the water regulating
valve .
WRV Gain is an adjustable item which sets the "Gain" used in
the PI control function of the water regulating valve .
WRV PAT is an adjustable item which sets the "project ahead
time" used in the PI control function of the water regulating
valve .
WRV Max Chg is an adjustable item that sets the maximum
value for an increase or decrease of the water regulating valve .
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Default Setting
—
—
—
260psi
10psi
10s
3 .6
10s
7%
60s
10%
58°F
105°F
130s
60s
WRV Init Tm is an adjustable item that sets a minimum time
period that the WRV remains at an initial startup position
(InitPos) during the WRV start sequence . .
Min WRV Pos is an adjustable item used which sets the
minimum WRV position used in the WRV start sequence
(default 10%) .
Min WRV Tmp is an adjustable item which is used to set the
edited temperature where WRV at a minimum position does
not result in a high pressure condition .This is used in the WRV
start sequence .
Max WRV Tmp is an adjustable item which is used to set the
edited temperature where WRV at 100% does not result in a
low pressure condition .This is used in the WRV start sequence .
WRV Act Time is an adjustable item which is used to set the
time required for the WRV to be driven from 0 to 100% .
Min WRV Time is an adjustable item which sets the minimum
WRV time (default 60 seconds) used in the WRV start
sequence .
55
Range
0–100%
0–750psi
0–750psi
230–340psi
0–50psi
0–999s
0 .0–100 .0
0–999s
0–100%
0–3600s
0–100%
20–150°F
20–150°F
0–300s
0–3600s
OM 920-6 • MICROTECH UNIT CONTROLLER
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