5-7
5.2.3 Cooling System Problems
Water Leaking – Water leaks from underneath the lid cover and inside the
furnace enclosure.
Typical Cause
• Coolant temperature entering furnace is below the dew point temperature
in the facility causing condensation. This condition if ignored will cause
damage to the furnace system.
Water Leaking – Water leaks from underneath the lid cover but not inside the
machine enclosure.
Typical Cause
• O-ring seals between lid and view port housing are defective. Refer to
section 5.4. Item 23 O-ring(s) shown on the “Lid Assembly” pictorial
drawing must be replaced.
Water Leaking – Water leaks from inside furnace enclosure.
Typical Causes
• Leaking fittings, tubing, or exhaust heat exchanger. Remove the furnace
enclosure and check each connection and tube with the cooling water
flowing. Pay particular attention to dried water stains, or rust spots on
the chassis to help in locating the leak. Refer to the pictorial drawing
“Cooling System” to identify replacement parts.
5.2.4 Alarms
The alarm system on the Model 1200 is simplistic in design, providing one
output for two possible fault conditions. It is important to understand how the
system works so that the operator or technician can quickly determine what is
wrong.
• The cooling system contains a flow switch that detects if water is flowing
through the system. If the cooling water is interrupted, or the switch
fails, the alarm will sound and the process will stop.
• The lid latching mechanism uses two switches wired in series to
determine if the latch has fully engaged the strike assembly. If one of the
switches fails or if the latch does not fully engage the strike pin, the
process will not initiate when the start button is pressed and the alarm
will sound.
Typical Causes - Coolant Related
• Defective water flow switch. Referring to the plumbing diagram in
Section 6, locate 1FLW; item 7, on pictorial drawing “Cooling System.”
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