Table of Contents
Advertisement
Troubleshooting
Problem
1. Insufficient heat
2. No heat output
© 2023 Nordson Corporation
WARNING:
Allow only qualified personnel to perform the following tasks. Follow the
safety instructions in this document and all other related documentation.
These troubleshooting procedures cover only the most common problems. If you
cannot solve a problem with the information given here, contact your local Nordson
representative for help.
Possible Cause
Faulty thermometer
Demand is exceeding
the capacity of the heater
Coating material is
baked on the inside of
the fluid passage body
Thermostat failed in the
on position causing the
heat limiter to open an
electrical circuit to the
heater cartridge
Heater cartridge failed
Corrective Action
Lightly tap the thermometer to make sure it is not giving an erratic
reading. If an erratic reading still exists, replace the thermometer.
Make sure the heating capacity is not being exceeded. A single
heater has the capacity to raise the temperature of most organic
solvent type coating materials 56 °C (100 °F) at a flow rate of
45 l/hr (12 gph). A temperature rise greater than 56 °C (100 °F)
would proportionately decrease the capacity of the heater.
For stainless steel heaters:
Flush the heater with a compatible solvent. If the heat output is
not sufficient after flushing it out, replace the fluid reservoir.
For all other heaters:
Disassemble the heater and clean the fluid passage body. Refer
to the Repair section or the Disassembly Tool Kit section for more
information.
Replace the thermostat and heat limiter. Refer to the Repair
section for more information.
Refer to the Repair section for more information. Disconnect the
heater cartridge leads 2 and L2 from the terminal block. Check
for continuity between the heater cartridge leads 2 and L2. If
continuity is not present, replace the heater cartridge.
NH-4 Heaters
17
1602369-05
Advertisement
Table of Contents
