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Clg State is a status only item which displays the current
compressor operating state when the unit is in the Cooling
operating state or when dehumidification operation is active.
See page 55
for compressor cooling operating state details .
Htg State (Heat Pump only) is a status only item which
displays the current compressor operating state when the unit
is in the Heating or Min DAT operating state .
for compressor heating operation state details .
INV Cmp Spd is a status only item which displays the current
inverter compressor speed in percent of the maximum .
INV Spd Cmd is a status only item that indicates the current
commanded speed of the inverter compressor .
VCmpOilStatus is a status only item which displays if the unit is
in oil boost mode or standard operation . Open indicates a low oil
reading
Comp 3 is a status only item which displays the current on/off
status of the fixe compressor.
INV Port Temp is a status only item which displays the current
value of the calculated temperature (based on the current
suction pressure reading) at the inverter compressors inlet
port . This value is used in the inverter compressor discharge
line higher temperature limiting protection function .
INV Fin Temp is a status only item which displays the current
inverter compressor control board cooling fin temperature.
This value is used in the inverter compressor fin temperature
limiting protection function .
INV Amps is a status only item which displays the amps used by
the inverter compressor (3-15Ts only) . This can indicate a high
amp unloading occurance .
Ctrl Card Tmp is a status only item which displays the drive
temperature (16-28Ts only) . This can indicate a high temp
unloading occurance .
Heatsink Tmp is a status only item which displays the board
heat temperature (16-28Ts only) . This can indicate a high temp
unloading occurance .
PTD is a status only item which displays the current value of
the discharge line refrigerant pressure .
PTS is a status only item which displays the current value of
the suction line refrigerant pressure .
4 Way Valve (Heat Pump only) is a status only item which
displays the current Heat/Cool (Closed/Open) status of the
heat pump four way reversing valve .
RcvrSol Valve (Heat Pump only) is a status only item which
displays the current Open/Closed status of the heat pump
receiver solenoid valve .
BP Sol Valve is a status only item which displays the current
Open/Closed status of the refrigerant circuit bypass solenoid
valve . This valve is normally closed but opens when needed to
equalize the low and high side refrigerant pressures.
Clg Stg Time is an adjustable item used to set a minimum time
period between compressor stage changes
Clg Lo OAT Lk is an adjustable item which sets the low
outdoor air temperature mechanical cooling lockout point .
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Mechanical cooling operation is disabled when the outdoor air
temperature sensor input falls below this set point .
Clg OAT Diff is a status only item which indicates if the unit is in
the deadband for the low ambient cooling lockout and will indicate
when the unit is no longer in that lockout condition .
Htg Lo OAT Lk is an adjustable item that sets a low outdoor
See page 65
ambient temperature value below which compressor heating is
locked out .
Htg Hi OAT Lk is an adjustable item that sets a high outdoor
ambient temperature value above which compressor heating is
locked out .
EffHtgOATLk is a status only item that displays the current
value that is being used for high outdoor ambient compressor
heating lock out . Normally this value reads the same as the Htg
Hi OAT Lk but can be lower due to the low differential pressure
limiting function while the unit is operating in the Heating or
MinDAT states .
Htg OAT Diff is a status only item which indicates if the unit is the
deadband for the high ambient compressor heating lockout and
will indicate when the unit is no longer in that lockout condition
INV Period is an adjustable item that sets the sample period
for the PI loop used to control the compressor capacity to
maintain the effective discharge air temperature set point.
INV Gain is an adjustable item that sets the Gain for the PI
loop used for the PI loop used to control the compressor
capacity to maintain the effective discharge air temperature set
point .
INV PAT is an adjustable item that sets the project ahead
time for the PI loop used for the PI loop used to control the
compressor capacity to maintain the effective discharge air
temperature set point .
INV Max Chg is an adjustable item that sets the maximum
change value for the PI loop used for the PI loop used to
control the compressor capacity to maintain the effective
discharge air temperature set point .
OilManagement is a status only point that indicates if the unit
(16–28 Ton only) is in a oil boost mode or not .
LowOilTime is an adjustable point to set the length of time,
while in oil return mode, the unit will verify oil level as adequitely
maintained .
OilBoostTime is an adjustable point to set the length of time,
while in oil return mode, the unit will actively accellerate the
compressor speed to return oil to the compressor .
VFD Status is a status only point from the inverter compressor
VFD (16–28 Ton only) indicating the current state of the drive .
VFD Alm/Wrn is a status only point from the inverter
compressor VFD (16–28 Ton only) indicating the drive fault
codes .
25
Commission Unit
OM 1263 • MICROTECH UNIT CONTROLLER
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