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ALARM DISPLAY
Any alarm will cause alarm relay to switch. All alarms have a distinct display shown on the four-digit display on
the controller. The red LED will be on for a pressure or suction temperature sensor alarm and the amber LED
will on for all other alarms. Multiple alarms can exist. There is a priority as to which alarm will be displayed
before another.
Onboard
4 Digit
Display Description PRIORITY
NOAL Displays when there are no alarms.
PRSA pressure transducer 1
STSA evaporator outlet temperature sensor TS1 alarm 2
ATSA room temperature sensor TS2 alarm 3
LOSH low superheat alarm 4
HITA high room temperature alarm 5
LOTA low room temperature alarm 6
CTSA defrost termination sensor TS3 alarm 7
LPRA Low pressure alarm 8
COMA communication alarm 9
Setting Parameters By On-Board Pushbuttons
There are two levels for programming the controllers with the four-digit display and six pushbuttons. The
first level (User’s Level) will enable the USER to set the room temperature set point ‘RMSP’; the second level
(Technician’s Level) allows access to the other parameters as described above.
User’s Level Press the right or left button until ‘STPT’ (Set point) is displayed. Press the ‘ENTER’
button. If ‘PSWD’ (Password) is displayed, press the ‘ENTER’ button again. The
display should read ‘0000’ with the 0 on the right blinking. Enter the password ‘0001’
by using the up and down buttons to increment or decrement the blinking digit, and the
right or left buttons to move the blinking digit to the next digit. When the display reads
‘1111’, press and hold the ‘ENTER’ button (about 3 seconds) until ‘RMSP’ (room set
point’ is displayed. Press the ‘ENTER’ button to display the value for ‘RMSP’. If you
want to change the value, press and hold the ‘ENTER’ button until the right digit starts
blinking (about 3 seconds). Use the up and down buttons to increment or decrement
the value. Use the right and left buttons to change the digit that is blinking. When the
value that is wanted is displayed, press and hold the ‘ENTER’ button until the digit
stops blinking (about 3 seconds). At any time, pressing the ‘BACK’ button will escape
to the step before.
TECHNICIAN’s Level Press the right or left button until ‘STPT’ (Set point) is displayed. Press the ‘ENTER’
button. If ‘PSWD’ (Password) is displayed, press the ‘ENTER’ button again. The
display should read ‘0000’ with the 0 on the right blinking. Enter the password ‘0002’
by using the up and down buttons to increment or decrement the blinking digit, and the
right or left buttons to move the blinking digit to the next digit. When the display reads
‘0002’, press and hold the ‘ENTER’ button (about 3 seconds) until a set point’ is
displayed. Use the up and down buttons to get to the set point that is wanted. Press
the ‘ENTER’ button to display the value for that set point. If you want to change the
value, press and hold the ‘ENTER’ button until the right digit starts blinking (about 3
seconds). Use the up and down buttons to increment or decrement the value. Use
the right and left buttons to change the digit that is blinking. When the value that is
wanted is displayed, press and hold the ‘ENTER’ button until the digit stops blinking
(about 3 seconds). At any time, pressing the ‘BACK’ button will escape to the step
before.
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