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WAECO USA, Inc.
25
WINTER OPERATION
If ambient temperatures drop below 35°F in the operational area of the
condensing unit, it may be necessary to block off half of the air
condenser face area (on the side opposite the condenser fan motor) with
a piece of cardboard to maintain system efficiency. The cardboard can
simply be taped in place for the winter season and removed in the spring
when seasonal temperatures return to above 35°F.
PROGRAMMING DIGITAL CONTROL
(if supplied with your system)
The digital thermostat is pre-programmed at the factory. If settings have
to be changed, the following information will allow you to easily
program the controller.
• SET POINT (SP)
This is the desired temperature of the refrigerator. It
is pre-programmed at the factory to a temperature range of 35—45°F
(0—20°F for freezer).
TO PROGRAM SET POINT
(SP1)
1.
To start the programming sequence, press the SET button once. Unit
displays “SP1” (set point 1)
2.
Press the SET button again to display SP1 value.
3.
To program an increase or decrease in SP1, press the appropriate
ADJUST arrow.
4.
To complete the programming sequence, press the SET button until
the screen goes blank. After five seconds, the unit will automatically
display sensor temperature.
• DIFFERENTIAL (dF)
This is the difference between the cut-in and cut-
out temperature of the thermostat. The differential must be a negative
value. If it is set as a positive value, the relay in the thermostat will
close on temperature fall and open on temperature rise. In other
words, it will respond as a heating thermostat instead of a cooling
thermostat.
Do not set a positive differential. Do not set a differential
of 0 (zero).
• HIGH & LOW SET POINT LIMITS (HI & LO)
Allow you to limit the
range at which temperature set points can be programmed. This is
factory set and should not need to be adjusted, unless changing from
refrigerator to freezer or vice versa..
TO PROGRAM DIFFERENTIAL
(dF) (HI) AND (LO) POINTS
Should only be adjusted if necessary. To start the process, you must
press the hidden button located behind the “F” symbol at the upper right
corner of the control to program these settings. After programming, you
must press the “F” button until the screen goes blank.
1.
Press “F” once. “DF1” will appear on the screen. Press “F” again. A
negative value will appear. Use the appropriate “ADJUST” arrow to
change this setting.
2.
This event must be set to a negative value but should not be lower
than —5 to avoid short-cycling.
3.
Press the “F” button again. The screen will read “HI”. Press “F” again
and you will read a value. This is the high setpoint limit. It prevents
the control from being tampered with and raised any higher than this
point. Now you can press the “ADJUST” arrows to get to your desired
setpoint.
4.
Press the “F” button again. The screen will display “LO”. Press the “F”
and you will read the LO setpoint limit. Use the “ADJUST” arrows to
change it.
5.
Pressing the “F” button again will display “CAL”. Press “F” again and
you should see 00. This should never be changed. If “CAL” reads any
value either than 00, use the “ADJUST” arrows until it reads 00.
6.
Press the “F” button again. You will see a blank screen. The
reprogramming has been accepted and the control will now revert to
the box temperature display mode.
NOTE:
If the programming sequence is interrupted for more than 15
seconds or not set to the blank screen, the thermostat will revert to
temperature display without acknowledging any new inputs.
• CALIBRATION (CAL)
Factory calibrated to a certified standard.
Do not alter or change.
