Model H1301 Recovery and Recycling System
Installation, Operation and Maintenance Manual
Revision-L September, 2019
Page 75 of 105
VII. System Maintenance Procedures
M. Pressure Controller Adjustment and Calibration (continued)
5. Pressure Controller Troubleshooting and Calibration
Required Materials:
Calibration Screwdriver
Voltmeter: 20 VDC and 200 VAC Ranges
Ammeter: 0-20mA Input Range with .1mA resolution and less than 100 ohms input
impedance.
4-20mA Loop Simulator: 4-20 Loop Simulators may be purchased from instrumentation
supply companies such as Omega Engineering. Alternatively any stable DC current source,
with 4mA and 20mAoutputs capable of driving a 10 ohm load, may be used
NOTE: Reference figure-17 for depictions of the wiring locations and connections.
a. Place all Control Panel switches to the AUTO position and the Cooling System
Controller Power Switch to the OFF position.
b. 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.
c. Using the Voltmeter, configured for AC voltage measurement, to verify 104 to
130VAC from the Pressure Controller J1-1 terminal to the J1-2 terminal.
d. Place the System Power Switch to the OFF position.
e. Disconnect Main Power from the machine.
f. Remove the Loop Signal Wires, a red and a black wire encased within a gray
jacket, from the J4 terminal block located on the Pressure Controller Circuit.
g. Refer to figure-17 Block Diagram #2. Connect the Ammeter and 4-20mA Loop
Simulator to the J4 connector of the Pressure Controller Circuit as follows:
Loop Simulator Positive Output to Ammeter Positive Probe
Loop Simulator Negative Output to Controller J4-2
Ammeter Negative Probe to Controller J4-1
h. Connect Main Power to the machine.
i. Place the System Power Switch to the ON position.
j. Use the 4-20mA Simulator to input 4.0mA as displayed by the ammeter. Observe
the Pressure Controller Display and adjust the Pressure Controller Zero
Potentiometer to obtain a zero pressure display.
k. Use the 4-20mA Simulator to input 20.0mA as displayed by the ammeter. Observe
the Pressure Controller Display and adjust the Pressure Controller Span
Potentiometer to obtain a 250 PSIA pressure display.
l. Repeat steps j & k until the zero and span potentiometers of the Pressure Controller
do not require adjustments.
m. Use the 4-20mA Simulator to input 12.0mA as displayed by the ammeter.
Observe the Pressure Controller Display shall be 125 PSIA.
NOTE: If the Pressure Controller cannot be calibrated it should be replaced. Contact
the factory for replacement information.
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