Head Pressure Setup Menu - McQuay MicroTech III RAH Operation And Maintenance Manual

McQuay OM 920-1

Head Pressure Setup Menu

Table 31: Head Pressure Setup Menu
Menu Display Name Item Display Name
Head Press Setup Head Press DB=
WRV Period=
WRV Gain=
WRV PAT=
WRV Max Chg=
Init Op Time=
Min WRV Pos=
Min WRV Tmp=
Max WRV Tmp=
WRV Act Time=
Min WRV Time=
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 "proportional band" used in the PI control
function of the water regulating valve.
WRV PAT is an adjustable item which sets the "project ahead" 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.
Init Op Time The first compressor runs for an editable Initial Operation Time (InitOpTime)
with the WRV at an initial start up position (InitPos).
Min WRV Pos is an adjustable item used which sets the minimum WRV position (default
10%).
Min WRV Tmp is an adjustable item which is used to set the edited temperature where WRV
at a minimum position is OK.
Max WRV Tmp is an adjustable item which is used to set the edited temperature where WRV
at 100% is OK.
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.
Chilled Water Setup Menu
Table 32: Chilled Water Setup Menu
Menu Display Name Item Display Name
Chilled Water Setup Clg DB=
Clg Period=
Clg Gain=
Clg PAT=
CW Max Chg=
Stage Time=
OAT Clg Lock=
OATDiff=
Clg DB an adjustable item which sets a dead band around the discharge cooling setpoint
parameter. For example, if the discharge cooling setpoint parameter is set to 55ºF and the Clg
Db parameter is set to 2ºF the dead band around the set point would be from 56.0ºF to 54.0ºF.
Keypad/Display Menu Structure
Default Setting
10psi
10s
3.6
10s
7%
60s
10%
58°F
105°F
60s
60s
Default Setting
2.0°F
20s
1
40s
15%
5min
55°F
2°F
Range Password Level
0-50psi 4
0-999s 4
0.0-100.0 4
0-999s 4
0-100% 4
0-3600s 4
0-100% 4
20-150°F 4
20-150°F 4
0-300s 4
0-3600s 4
Range Password Level
1.0-10.0°F 4
0-999s 4
0.0-100.0 4
0-999s 4
0-100% 4
5-60min 4
0-100°F 4
0-10°F 4
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