4-18
Displaying Alternate Temperatures
µ
P-D Controller
CSR-20 & CSR-40, September 1999
Displaying Alternate Controlling
(Supply or Return) Air Sensor
Temperature
The controller can show either the supply air or return air tem-
perature in the right display. With the unit On/Off switch ON
and the controller showing the Standard Display:
1.
Check the indicator LEDs to determine which sensor tem-
perature (supply air or return air) currently appears in the
right display. This is the controlling sensor (supply air
sensor at setpoints of -9.9 C [14.1 F] and above; return air
sensor at setpoints of -10 C [14 F] and below).
2.
To view the alternate air sensor temperature, press and
hold the RET/SUP key. The controller will show the tem-
perature of the alternate (non-controlling) air sensor as
long as the RET/SUP key is depressed.
3.
The display then returns to the Standard Display when the
RET/SUP key is released.
or
Changing the Setpoint
To change the controller setpoint, turn the unit On/Off switch
ON. With the Standard Display showing on the controller (i.e.
setpoint and controlling sensor temperature):
1.
Press the DOWN or UP arrow key. The left display flash-
es “SETPT” while the right display shows the changing
setpoint temperature. To set the tenths digit, wait 4 sec-
onds for all three digits to appear on the display. Make
additional setpoint adjustment if necessary.
IN RANGE
DEFROST SUPPLY RETURN PWRLMT ALARM
HEAT
NULL
MOD
COOL
SETPOINT
TEMPERATURE
DATA
DATA
°
IN RANGE
DEFROST SUPPLY RETURN PWRLMT ALARM
HEAT
NULL
MOD
COOL
SETPOINT
TEMPERATURE
DATA
DATA
°
°
RET
SUP
NOTE: The setpoint temperature can be entered
in either
o
F or
o
C using the F/C key. Just press
and hold the F/C key (to display the alternate
temperature scale). Press the UP or DOWN key
to scroll to the correct setpoint temperature.
Then press the ENTER key to load the setpoint.
2.
When the desired setpoint appears in the right display,
press the ENTER key. The right display shows “LOAD”.
NOTE: If the ENTER key is not pressed within 10
seconds, the controller will default (return) to the
previous setpoint. If this occurs, repeat steps 1
and 2.
3.
The display then returns to the Standard Display (showing
new setpoint).
IN RANGE
DEFROST SUPPLY RETURN PWRLMT ALARM
HEAT
NULL
MOD
COOL
SETPOINT
TEMPERATURE
DATA
DATA
°
°
IN RANGE
DEFROST SUPPLY RETURN PWRLMT ALARM
HEAT
NULL
MOD
COOL
SETPOINT
TEMPERATURE
DATA
DATA
