Traulsen VPS90S - Manual (Page 4)

IV. h - ADJUSTING THE TEMPERATURE (cont’d):
the bottom (see figure 2). To disable the keypad, slide
the switch to left (LOCK) position. To enable the key-
pad, slide the switch to the right (UNLOCK) position.
Please note that the control is shipped from the fac-
tory in the locked position.
Once the control is set to the UNLOCK position, it can
then be programmed in four simple steps using the
LCD display and the three keys on the control face.
STEP 1- To start programming, press the SET key once
to access the Fahrenheit/Celsius mode. The display
will show the current status, either F for degrees Fahr-
enheit or C for degrees Celsius. Press the up or down
arrow keys to toggle between the F and C designa-
tion.
STEP 2- Press the SET key again to access the setpoint.
The LCD will display the current setpoint and the S1
annunciator will be blinking on and off to indicate that
the control is in the setpoint mode. Press the up and
down arrow keys to increase or decrease the setpoint
to the desired temperature.
STEP 3- Press the SET key again to access the differ-
ential. The LCD will display the current setpoint and
the DIF1 annunciator will be blinking on and off to in-
dicate that the control is in the differential mode. Press
the up and down arrow keys to increase or decrease
the differential to the desired setting.
STEP 4- Press the SET key to access the cooling or
heating mode. The LCD will display the current mode,
either C1 for cooling or H1 for heating. Press the up
and down arrow keys to toggle between the C1 or H1
designation. Press the SET key once more and pro-
gramming is complete.
NOTE: The control will automatically end programming
if no keys are depressed for a period of thirty seconds.
Any settings that have been input to the control will
be accepted at that point.
LOCKOUT: LOCK UNLOCK
DISPLAY CODES
F
FAHRENHEIT
C CELCIUS
H1 HEAT SATGE 1
C1 COOL STAGE 1
EP PROBE FAILURE/
OUT OF RANGE
EE EEPROM ERROR
E1 IMPROPER SET
E2 MEMORY ERROR
R
IV. a - MASTER SWITCH:
The master switch is located at main electrical box
behind the louver panel and should be in the OFF po-
sition.
IV. b - POWER SUPPLY:
Connect the power supply cord to the proper fused
receptacle in accordance with state and local codes.
IV. c - CONDENSING UNIT:
The condensing unit is cycled by a low pressure con-
trol set at approximately 52 lbs. cut-in, 18 lbs. cut-out.
All valves on the condensing unit are open when
shipped. Check all connections for leaks with an elec-
tronic detector before starting unit.
IV. d - TURNING THE UNIT ON:
Turn the master switch to the ON position.
IV. e - CHECKING THE TEMPERATURE:
Check the temperature of the refrigerated unit to in-
sure cooling is being obtained, and adjust the temp
control as needed. Re-check operation after several
hours and again after two or three days.
IV. f - OPTIONAL LCD THERMOMETER:
If supplied with an optional LCD thermometer, to acti-
vate remove paper film from LCD thermometer bat-
tery contacts by opening the louver panel and reach-
ing behind the thermometer to access batteries (AA
batteries included).
IV. g - DEFROST TIMER:
Set defrost timer to correct time of day after unit is
plugged in. Pins are set from the factory, EXAMPLE:
10am, 2pm, 8pm, 2am and 6am. A minimum of five (5)
defrost cycles are required per day.
IV. h - ADJUSTING THE TEMPERATURE:
The refrigeration system has been properly charged
and tested at the factory. It is regulated by an elec-
tronic control.
All control settings are retained in a non-volatile
memory. If the power supply is interrupted for any
reason, re-programming is not necessary unless dif-
ferent control settings are required.
The control is equipped with a lock-out switch to prev-
ent unauthorized tampering. When placed in the LOCK
position, the keypad is disabled and no changes to
the settings can be made. When placed in the UN-
LOCK position, the keypad will function normally.
To access the lock-out switch, first disconnect the
power supply, then open the control. The switch is
located on the inside cover about two inches above
-3-
IV. OPERATION/START-UP
Fig. 2