CSR-20 & CSR-40, September 1999
µ
P-D Controller
Menu Guard Functions
4-33
c.
When the desired type number shows in the right dis-
play, press the ENTER key. The display shows
“H1TYP LOAD” and then shows “H1TYP XXXX”
(where “XXXX” is the new type setting).
2.
From “H1TYP XXXX” in the controller display, press
the DOWN key until the display shows “UHMT1 XX”
(where “XX” is the number of threshold hours).
a.
Press the SELECT key to enter the load User
Hourmeter Threshold display (left display flashes
“UHMT1”).
b.
Press the UP or DOWN key to choose the desired
threshold setting.
c.
When the desired threshold hours show in the right
display, press the ENTER key. The display shows
“UHMT1 LOAD” and then shows “UHMT1 XX”
(where “XX” is the new threshold hours).
3.
From “UHMT1 XX” in the controller display, press the
DOWN key until the display shows “UHRM1 XXXX”
(where “XXXX” is the number of accumulated user
hours).
NOTE: If the number of accumulated user hours
can not be determined, leave this setting “0000”.
a.
Press the SELECT key to enter the load User
Hourmeter display (left display flashes “UHRM1”).
b.
Press the UP or DOWN key to choose the desired
hour setting.
c.
When the desired hours show in the right display,
press the ENTER key. The display shows “UHRM1
LOAD” and then shows “UHRM1 XXXX” (where
“XXXX” is the new accumulated user hours).
Setting the Sensor Grades
The Menu Grade submenu (MENU GUARD) displays the sen-
sor grade of each graded sensor installed on the unit.
NOTE: If a sensor grade is set to “0”, it means the
sensor has been ice bath calibrated. Original unit
sensors are ice bath calibrated at the factory and
Thermo King recommends ice bath calibration when
replacing the Return Air, Supply Air and Coil
Temperature Sensors. If an ice bath is NOT available,
the controller should be set to the “grade” stamped
on each individual sensor.
The Ambient Temperature Sensor and Condenser Coil
Temperature Sensor are ungraded sensors and may be calibrat-
ed if desired. However, because they are NOT controlling sen-
sors, they do not require calibration. If you do NOT calibrate
these ungraded sensors, the ambient sensor and condenser coil
sensor grades should be set to “5”.
Ice Bath Preparation:
•
The ice bath should consist of an insulated container full
of ice made from distilled water with enough distilled
water added to cover the top of the ice during the test. A
properly filled ice bath should be completely filled with
ice all the way to the bottom of the container.
•
Stir the ice bath briskly for one minute before proceeding.
•
Insert the sensors to be calibrated in the ice bath. Wait 5
minutes to allow the sensor temperatures to stabilize at 0
C (32 F).
•
Stir the ice bath frequently while testing and verify ice
bath temperature with a mercury-in-glass thermometer.
Stirring 10 seconds every 3 minutes during the test proce-
dure is adequate.
NOTE: To set the sensor grades, you will need the
sensor grade number recorded on the setup decal in
the control box. If there is any question about the
actual grade of a sensor, physically check the sen-
sor. The grade will be stamped on the side of the
sensor.
1.
From “GMENU <--->” in the Guard menu, press DOWN
key until display shows “MENU GRADE”.
2.
Press the SELECT key to enter GRADE submenu (display
shows “GRADE <--->”).
3.
Press the DOWN key until “RETG XX” shows in the
display (where “XX” is the sensor grade).
a.
Press the SELECT key to enter the load Sensor Grade
display (left display flashes “RETG”).
