THERMODYNE 1600NDNL, International Service Manual

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probes check the fluid levels in the Heater Tank
and the Reservoir Tank. Also, check the electrical
connection to the probes. The probes should test
as open with a continuity test when the tanks are
filled with fluid. With an empty tank the probe should
test as closed during a continuity test.
NOTICE: In BWSNDNL models the B&G Pump
and Heater Tank are located at the back of the unit.
Removal of the Back Panel is required when servicing
the B&G Pump or Heater Tank Components.
1. Follow the LOCKOUT/TAGOUT procedure
using the procedures provided in the Lockout/
Tagout Procedures section of this manual.
2. Remove the Power Head Lid following the
instructions provided in the Panels and
Covers section of this manual.
3. Remove the left side panel using the procedures
provided in the Panels and Covers section of
this manual.
4. Locate the Drain Tube and place it into an
empty pan.
5. Remove the Heater Tank Cap and the
Reservoir Cap.
6. Open the Drain Valve to drain the Heat
Transfer Fluid.
7. Discard the drained fluid; refer to the Material
Safety Data Sheet provided in this manual for
proper disposal of fluid.
Fluid
Sensor
Probes
Figure 21: Fluid Sensor Probes
8. Disconnect the Fluid Sensor Probe lead.
9. Remove the defective probe.
10. Install the new probe.
11. Reconnect the probe lead.
12. Restore power to the unit.
13. Close the fluid Drain Valve.
14. Fill the Heater Tank and Reservoir Tank with
fluid until the Low Fluid Light goes out.
15. Ensure that are no leaks around the newly
installed probe, tighten as needed.
16. Remove the unit from its power source.
17. Reattached the Side Panel and Power
Head Cover.
18. Restore power to the unit and verify the unit
is operating correctly. It may be necessary to
add additional fluid after the unit has operated
for several minutes.
WARNING
Before removing any sheet metal panels
or servicing this equipment, always
perform the Electrical LOCKOUT/TAGOUT
Procedure. Be sure all circuits are
disconnected. Failure to comply with this
procedure can cause property damage,
injury or death.
WARNING
Certain components may be hot if the
unit was in operation prior to performing
a procedure. Allow the unit to cool before
beginning work.
WARNING
Before servicing the plumbing system the
heat transfer fluid must be drained from
the system.