McQuay PFS 155C, Руководство по эксплуатации и обслуживанию

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OM 135 PFS 155C - 315C 37
Min Position= This value is used in calculating when the valve position will change. The default values should be
adequate for most applications.
Max Position= This value is used in calculating when the valve position will change. The default values should be
adequate for most applications.
Valve Type= This value indicates the type of output (increasing or decreasing voltage) supplied to the control valve
controller. If the valve requires a 0-10 Vdc to open select the 'N/C' valve. The 'N/0' selection would provide a 0 Vdc for
valve to be open and a 10 Vdc for the valve to be fully closed.
Mod Limit= This value is used in MicroTech calculations and can increase or decrease the controller sensitivity.
Sample Time= This value determines how frequently the MicroTech looks at the water temperature entering the
condenser.
Max Change= The value limits the amount the valve position can change at one time.
PA Time= This value will reduce control point overshoot and produce quicker response to load variations.
Min Start Pos = This value will control the minimum position of the valve during pre-start at a pre-selected (Min Pos
At=) outside air temperature.
Max Start Pos= This value will control the maximum position of the valve during pre-start at a pre-selected (Max Pos
At=) outside air temperature.
Min Pos At= The outside air temperature associated with the Min Start Pos=.
Max Pos At= The outside air temperature associated with the Max Start Pos=.
Menu 16, Alarm Setpoints
Press the "NEXT MENU" key and Menu 16 will be displayed. This menu is password protected and requires the service
password. These values are set by the start up technician. Changing these values could cause compressor damage.
The menu can be monitored and setpoints compared to actual operating conditions.
Item
Screen Line Display Field Range
1 1 High Condenser Press-Shutdown.. 400psi 1 240-480psi
2 High Condenser Press-Unload.... 300psi 1 240-480psi
3 High Condenser Press Hold...... 270psi 1 240-480psi
2 1 High Discharge Temp-Shutdown... 150.0
o
F 1
2 Low Evaporator Press-Unload.... 57.0psi 1 10.0-45.0psi
3 Low Evaporator Press-Shutdown.. 54.0psi 1 10.0-45.0psi
3 1 Motor Current Threshold.. 10% 1 1-20%
2 Evap Water Freeze................ 34.0
o
F 1 -9 - 45
o
F
3 Cond Water Freeze................ 34.0
o
F 1 -9 - 45
o
F
4 1 High Discharge Superheat Shutdn 50.0 °F 1
2 ……..during compressor start 70.0°F 1
Menu 17, Setpoint Options
Press the "NEXT MENU" key and Menu 17 will be displayed. This menu is password protected and requires the service
password.
Item
Screen Line Display Field Range
1 Manual EXV=Off 1 Off-On
1 EXV Steps=0 2 -100 - 100
Timers=Normal 1 Normal
EXV CurPos = 2
1 Hot Gas Bypass=30% 1 20-70%
2 HotGas Timr = x min 2
2 Low Load = x °F 1
Lo Load Tmr = x min 2
3 Manual Pumpdown = No 1
PumpDn EvapP = x psi 2
3 1 Evap Offset=x.x psi 2 1-20Min
PmpDn SuperHt=40
o
F 2 0-100
o
F
2 Cond Offset=0.0psi 1 -9.9 - 15.0psi