Manual
2100-695
Page
25 of 54
The temperature is measured with a 10k ohm NTC
thermistor.
The liquid temperature sensor can be verified and
adjusted by:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to
I/O Config
;
press ENTER key.
4. Press UP or DOWN keys to scroll to
Liquid Temp
Sensor C2
.
5. Reference the
Value
to verify the temperature (see
Figure 41).
9. Press ESCAPE key several times to return to Main
Menu screen.
Condenser Fan Operation
Condenser Fan Speed Control
The unit is equipped with a variable speed ECM
(electronically commutated motor) condenser fan which
allows the unit to better control head pressures for
more efficient operation. The fan will speed up or slow
down to attempt to maintain a liquid line pressure.
The pressure setpoint that the fan will control to is
determined by the outdoor air temperature. The unit
will allow the liquid line pressure setpoint to increase
for high ambient scenarios or decrease for low ambient
scenarios. Because the control is dependent on both
the outdoor temperature sensor and the liquid line
pressure sensor, the controller will alter its operation
if a sensor is not enabled or failed. When the outdoor
temperature sensor is not enabled or is considered
failed by the controller, a nominal setpoint of 430
psi is used for fan control. When the liquid pressure
transducer is not enabled or is considered failed by the
controller, a nominal fan speed will be used during a
compressor call. See Figure 42.
The condenser fan requires the compressor to be
running in order to operate.
High Pressure Control
Condenser Fan Speed
When the liquid pressure reaches 550 PSI, the
condenser fan will speed up, moving as much air as
possible in an attempt to reduce system pressures. The
condenser fan will operate at increased speed until the
liquid pressure reaches 450 PSI. At this point, the fan
will return to normal operating speed.
FIGURE 41
Adjusting Liquid Temperature Values
FIGURE 42
Liquid Pressure Control Setpoint
6. If an offset needs to be applied, press ENTER key
to scroll to
Offset
.
7. Press UP or DOWN keys to change the offset to
desired value.
8. Press ENTER key to save.
