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The DXCTLO should be turned OFF (to ignore the
DXLOCK setpoint) in applications where there is either no
OAT sensor (local or broadcast) or the OAT sensor has failed.
For Version 1.3 — If there is a valid OAT sensor reading and
DXCTLO is set to “OFF”, compressor cooling will NOT be
allowed. Please note that this functionality was NOT by design,
and was an unintended consequence of the update to 1.3. This
will be changed in a future version of PremierLink™ control.
Users that do NOT require the cooling lockout function have
instinctively set DXCTLO to Off; unfortunately, this will dis-
able cooling if a valid OAT reading is present. If a valid OAT
sensor reading is present, DXCTLO must be set to On, or
compressor cooling will NOT be allowed.
If the OAT sensor is not installed (OAT point reads –40 F
and “Sensor Failure”), the cooling stages are NOT locked out
regardless of the setting of DXCTLO.
If there is a valid OAT sensor reading, and DXCTLO is
“ON”, cooling will be allowed when the OAT value is above
the DXLOCK setpoint.
Cooling will NOT be allowed when the OAT value is
below the DXLOCK setpoint and DXCTLO is “ON”.
To ensure that cooling will occur when there is no OAT
sensor installed, be sure to short the OAT sensor leads together.
DX Cooling
Lockout:
Range:
On/Off
Default Value:
On
DX COOLING LOCKOUT TEMPERATURE — The DX
Cooling Lockout Temperature specifies Low Ambient DX
Cooling Lockout Temperature that is compared against OAT to
determine if the unit can stage up or not.
DX Cooling
Lockout Temp:
Units:
Degrees F (Degrees C)
Range:
40.0 to 60.0
Default Value:
45.0
SAT CMP1 LOCKOUT TEMP — The SAT CMP1 Lockout
Temperature displays the low supply temperature set point for
compressor no. 1 supply air during cooling. If compressor no. 1
is on during Cooling mode, the economizer will assist the cool-
ing and work to maintain a discharge air temperature slightly
above lockout temperature set point. If the economizer is at
minimum and the supply air temperature goes below Lockout
Temperature set point, the compressor will cycle to maintain
the supply air set point. The minimum on and off times will
still be in effect.
SAT CMP1
Lockout Temp:
Units:
Degrees F (Degrees C)
Range:
50.0 to 65.0
Default Value:
55.0
SAT CMP2 LOCKOUT TEMP — The SAT CMP2 Lockout
Temperature displays the low supply temperature set point for
compressor no. 2 supply air during cooling. If compressor no. 2
is on during Cooling mode, the economizer will assist the cool-
ing and work to maintain a discharge air temperature slightly
above lockout temperature set point. If the economizer is at
minimum and the supply air temperature goes below Lockout
Temperature set point, the compressor will cycle to maintain
the supply air set point. The minimum on and off times and
stage-up and down timers will still be in effect.
NOTE: If the staged cooling number of stages value is con-
figured to 1, then the SAT CMP2 is used for the low supply
air set point.
SAT CMP2
Lockout Temp:
Units:
Degrees F (Degrees C)
Range:
45.0 to 55.0
Default Value:
50.0
TIME GUARD OVERRIDE — The Time Guard Override
function will reset the Time Guard. Whenever this option is
changed from OFF to ON, the control will evaluate the amount
of time left in Compressor Time Guards.
If the time in a Time Guard is more than 30 seconds, it will
be replaced with 30 seconds.
NOTE: Changing this decision from OFF to ON will only
result in one-time Time Guards override.
To perform the override again, the override must be
changed from OFF to ON again.
Time Guard
Override:
Range:
On/Off
Default Value:
Off
CONTINUOUS POWER EXHAUST — The Continuous
Power Exhaust function defines the operation of the Power
Exhaust Fan.
If disabled, the Power Exhaust Fan will operate during
economizer purge cycles when the economizer damper posi-
tion is above the configured minimum value. If enabled, the
Power Exhaust Fan will follow the supply fan's operation.
Continuous
Power
Exhaust:
Range:
Disable/Enable
Default Value:
Disable
SUPPLY FAN STATUS ENABLE — The Supply Fan Status
Enable function is enabled when an actual sensor input is used
to determine that the supply fan is on. This will prevent certain
algorithms to run if the controller does not see that the supply
fan is functioning properly.
If this decision is disabled, the Supply Fan Status will fol-
low the state of the Supply Fan Relay in order to allow the
algorithms to run that depend on the Supply Fan Status to be
ON before executing.
Supply Fan
Status Enable:
Range:
Disable/Enable
Default Value:
Disable
MAXIMUM OFFSET ADJUSTMENT — Maximum Offset
Adjustment value determines the degree in which the occupied
heating and cooling set points can be adjusted by the setpoint
adjustment slide bar on the space temperature sensor.
Max Offset
Adjustment:
Units:
Delta Degrees F
(Delta Degrees C)
Range:
0.0 to 15.0
Default Value:
2.0
SPACE TEMPERATURE TRIM — The Space Temperature
Trim configuration is used to calibrate the temperature display
for a sensor that does not appear to be reading correctly.
Space Temperature
Trim:
Units:
Delta Degrees F
(Delta Degrees C)
Range:
–9.9 to 9.9
Default Value:
0.0
SUPPLY AIR TEMPERATURE TRIM — The Supply Air
Temperature Trim configuration is used to calibrate the temper-
ature display for a sensor that does not appear to be reading
correctly.
Supply Air
Temperature
Trim:
Units:
Delta Degrees F
(Delta Degrees C)
Range:
–9.9 to 9.9
Default Value:
0.0
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