Model H1301 Recovery and Recycling System
Installation, Operation and Maintenance Manual
Revision-L September, 2019
Page 72 of 105
VII. System Maintenance Procedures
M. Pressure Controller Adjustment and Calibration (continued)
4. Pressure Transmitter Troubleshooting
The following procedure will detail how to verify correct operation of the pressure
transmitter. If the criteria listed below are not obtainable then the transmitter must be
replaced. Consult the factory for replacement.
Required Materials:
Calibrated Pressure Gauge 0-300 psi in 1-psi increments ¼% accuracy
¼” Refrigeration Service Hose
Commercial Grade Nitrogen Gas Source Regulated to 250si
Voltmeter: 20 VDC and 200 VAC Ranges
Ammeter: 0-20mA Input Range with .1mA resolution and less than 100 ohms input
impedance.
a. Place the System Power Switch to the OFF Position.
b. Disconnect the main electrical power from the machine.
c. 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 refer to
figure 17.
d. Connect the Loop Signal Wires to the Ammeter as follows: (Refer to Block Diagram
#1)
Loop Red Wire to Ammeter Positive Probe
Loop Black Wire to Ammeter Negative Probe
e. Connect a source of clean dry nitrogen gas regulated to 250 psi to the front panel
Inlet Valve of the machine.
f. Open the nitrogen source to the machine.
g. Briefly loosen the nitrogen connection at the Inlet Valve to purge air out of the
connecting plumbing. Then retighten the connection.
h. Open the manual Inlet Valve of the machine.
i. Place the front panel Power Switch to the ON Position and allow the machine to
cool to the setting for the appropriate type of agent.
NOTE: The Pressure Controller is now disconnected from the 4-20mA Loop. The
display of the Pressure Controller will typically read -50PSIA.
j. Connect the pressure gauge to the nitrogen vent port of the machine.
k. Place the front panel N2 Switch to the ON position. The pressure in the process
tank will now be indicated by the pressure gauge connected to the nitrogen vent
port.
The pressure in the process tank may now be controlled. Reduce the pressure in the
tank by loosening the connection at the pressure gauge to vent the tank. Increase the
pressure in the tank by operating the Inlet Valve Switch on the front panel. DO NOT
RELEASE THE PROCESS TANK PRESSURE ABOVE MINUS 60 DEGREES FOR
1301 AND FE25 MINUS 20 DEGREES FOR 1211 MINUS 10 DEGREES FOR FM200
THIS WILL RESULT IN EXCESSIVE AGENT LOSS.
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