Prochem Legend SE AD - Manual (Page 20)

OPERATION
LEGEND SE 980059 06/19/03 3-12
HEAT TRANSFER SYSTEM
See Figures 14 and 15. Water is heated through a
two stage heat exchange system which uses vacuum
pump exhaust and engine exhaust.
Stage one utilizes vacuum exhaust heat blowing over
a radiator-type heat exchanger prior to discharging
the exhaust into the atmosphere. When the tool
valve is closed, the water bypasses from the
pressure regulator manifold back to the water box
through the vacuum exhaust heat exchanger. The
water is heated as it flows through this heat
exchanger.
When the tool valve is open, the water flows from the
pressure regulator manifold and through the stage
two engine exhaust heat exchanger system where it
is super-heated by extremely hot engine exhaust.
The engine exhaust heat exchanger is an engine
exhaust chamber containing a stainless steel heating
coil and catalytic converter. Water flows through the
coil and is heated by the engine exhaust as is leaves
the engine. The catalytic converter, combined with
the injection of air pumped into the exhaust manifold,
re-burns the exhaust waste gases. This results in
super-heated water flowing through the solution
outlet to the cleaning tool.
VACUUM EXHAUST
HEAT EXCHANGER
CATALYTIC
ENGINE EXHAUST
HEAT EXCHANGER