Perma Pure Baldwin-Series M225 - Manual (Page 12)

Section H: Test & Adjustment Procedures 12
H:
T
EST
& A
DJUSTMENT
P
ROCEDURES
NOTE: All test and adjustment procedures have been performed at the factory.
Therefore, no adjustment should be necessary.
A. Main Control board
(1) WARNING: Before connecting power to the cooler, be aware of the
HAZARDOUS LIVE VOLTAGE on the control board. Disconnect power from the
cooler before opening the swing-down "L-door". Note: The auxiliary output board
must be removed if the cooler is so equipped. Remove the thermocouples from TB1
and TB2. The thermocouple generator should not be connected to either of the
thermocouple inputs at this time. Connect power to the cooler. After 10 to 20
seconds, the red LED(s) (thermocouple failure indicators) should be on.
(2) Connect the thermocouple generator to the Channel 1 thermocouple input, (TB1
terminal), inserting the yellow wire into the terminal marked Y and the red wire into
the terminal marked R. Turn on the generator. The red LED should turn off.
Connect a voltmeter between the ground test point, TP7 and TP1, the red lead to
TP1 and the black lead to TP7. Set the thermocouple generator to 0
° C. Set the
voltmeter to 20vdc range.
(3) Adjust POT1 (the zero pot) to obtain a 0vdc reading on the voltmeter.
(4) Set the thermocouple generator to 10
° C.
(5) Adjust POT3 (the span pot) to obtain a 1.0vdc reading on the voltmeter.
(6) Move the positive lead (red lead) of the voltmeter to TP5.
(7) Adjust POT8 (the ready pot) to obtain a 1.0vdc reading on the voltmeter.
(8) Move the positive lead (red lead) of the voltmeter to TP3.
(9) Adjust POT5 (the set pot) to obtain a 0.5vdc reading on the voltmeter.
(10) Set the thermocouple generator to 11
° C. The bottom green LED should be off.
(11) Set the thermocouple generator to 8
° C. The bottom green LED should be on.