Nor-Lake Angled Ice Cream Merchandisers - Manual (Page 8)

8
HOW TO CHANGE a parameter value
1. Enter the Programming mode by pressing the SET and DOWN ▼ keys for 3 seconds (LEDs
under DEF and COMP start blinking).
2. Select the required parameter by pushing the UP ▲ or DOWN▼ arrows
3. Press the “SET” key to display its value (now only the COMP LED is blinking)
4. Use
“UP” or “DOWN” to change its value
5. To exit: Press SET + UP ▲ or wait 15s without pressing a key.
NOTE 1: The set value is stored even when the procedure is exited by waiting the time-out to expire.
NOTE 2: Manufacture’s SETPOINT is set at a recommended –10
°F at the factory for low temperature(LT).
NOTE 3: To scroll down the parameters without changing them, press the DOWN button.
LIST OF PARAMETERS
Here is a list of the parameters the value of which can be changed in the programming mode, as well as
their ranges.
Factory
Setting
Display
Symbol
Description Range
MF122
St Temperature set point -16 to 5°F -10 ° F
Hy Cut-out temperature is Set + Hy, Differential 1 to 255°F 10 ° F
AU High temperature alarm is enabled after a delay 230°F 15 ° F
AL Low temperaturealarm is enabled after a delay -58°F -25 ° F
Ad Alarm delay 0 to 255 min 30
ALARM SIGNALS
Message Cause Outputs
“P1” Room probe failure Compressor output according to par. “Con” and “COF”
“P2” Evaporator probe failure Defrost end is timed
“HA” Maximum temperature alarm Outputs unchanged.
“LA” Minimum temperature alarm Outputs unchanged.
“dA” Door open Compressor and fans restarts
“EA” External Alarm Output unchanged
“CA” Serious External alarm(i1F=bAL) All output off
“CA” Pressure switch alarm (i1F=PAL) Outputs unchanged.
NOTE:
Probe alarms “P1” and “P2” start some seconds after the fault in the related probe; they
automatically stop some seconds after the probe restarts normal operation. Check connections
before replacing the probe.
Temperature alarms “HA” and “LA” automatically stop as soon as the thermostat temperature returns to
normal values and when defrost starts.