Model H1301 Recovery and Recycling System
Installation, Operation and Maintenance Manual
Revision-L September, 2019
Page 80 of 105
VII. System Maintenance Procedures (continued)
N. Process Temperature Controller Adjustment and Calibration (continued)
The following procedure will detail the routine maintenance calibration procedure that is
possible without accomplishing component level maintenance. If satisfactory operation is
not obtained using this procedure then verify component operation set forth in the
following sections for troubleshooting.
2. Calibration Procedure
Required Materials:
Calibration Screwdriver
Voltmeter: 20 VDC and 200 VAC Ranges
Straight Blade Screwdriver
92.8 ohm Resistor (may be constructed from a resistor network)
77.6 ohm Resistor (may be constructed from a resistor network)
a. Place the System Power Switch to the OFF Position.
b. Disconnect the main electrical power from the machine.
c. Open the filter access door of the hood and separate the two halves of the hood
fan electrical connector.
d. Remove the three screws along the top of the control panel and the three screws
on both sides of the control panel hood. With a helper, lift the hood up and over the
control panel.
e. Place all of the Front Panel Control Switches to the AUTO position.
f. Place the Cooling System Controller Power Switch to the OFF position.
g. Disconnect the Red and Black RTD signal wires from the Controller J2 terminal
block. Reference figure-20.
h. Connect the 92.8 ohm resistor from the J2-1 to the J2-2 terminals where the RDT
signal wires were connected.
i. Connect Main Power to the machine.
j. Place the System Power Switch to the ON position.
WARNING! THE AREA INSIDE THE CONTROL PANEL HOOD CONTAINS
120VAC POWER CONNECTIONS; DO NOT REST ANY PART OF
YOUR BODY ON ANY OF THE INTERNAL COMPONENTS.
k. Adjust the temperature controller zero potentiometer to obtain a 0 controller
display.
l. Place the System Power Switch to the OFF Position.
m. Disconnect the main electrical power from the machine.
n. Replace the 92.8 ohm resistor with the 77.6 ohm resistor.
o. Connect Main Power to the machine.
p. Place the System Power Switch to the ON position.
q. Adjust the temperature controller span potentiometer to obtain a –70 degree
controller display.
r. Repeat the adjustments using the two resistors until the potentiometers no longer
require adjustment.
s. Connect the RTD signal wires back to the Controller J2-1 and J2-2 terminals. The
connection is not polarized the black and red wire positions may be interchanged.
t. Reinstall the Control Panel Hood and connect the hood fan connectors.
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