Water Pumping And Heat Transfer System - Prochem LEGEND GT Operating Instructions Manual

OPERATION
Always wear hearing protection and proper
personal protection equipment when operating
unit.
WATER PUMPING AND HEAT
TRANSFER SYSTEM
WATER PUMPING AND HEAT TRANSFER
SYSTEM
Cold water enters the console through the water
inlet. When the water box is full the valve will
automatically shut off.
Water flows from the water box, into the solution
pump where it is pumped to the pressure regulator
manifold which provides and maintains the desired
pressure setting.
The pressure regulator manifold includes a pulse
hose, which helps reduce pressure spikes from the
pump.
A certain amount of water is by-passed from the
pressure regulator due to an over pumping capacity
of the solution pump. Water that is not called for in
the cleaning process is channeled through the
copper bypass radiator core in the front of the heat
exchanger. This bypass water may circulate several
times through the bypass heat exchanger core
allowing the water to be pre-warmed.
The gases coming from the vacuum pump and the
engine are forced through heater cores #2 and #3
creating the hottest area of the heater box,
increasing the heat transfer to the circulating water.
The hot water passes to the solution outlet manifold
where cleaning chemicals are injected from the
chemical pulse pump. This manifold serves as a
connecting point for the high-pressure hoses. Also a
check valve is located in this outlet manifold
prohibiting chemicals from backing up into the
system.
The cleaning solution then passes through high-
pressure hoses and is distributed by the cleaning
tool to a surface that is being cleaned, completing
the water pumping and heating cycle of the cleaning
unit
3-8
HEAT EXCHANGER
The water temperature in the plumbing system is
raised for better cleaning. This happens in the heat
exchanger. The heat exchanger is made up of three
stages. These three stages are engine exhaust
stage, the mixing stage, and the pre-warming stage.
The angled rear heat exchanger core receives its
heat only from the engine exhaust gases. This core
becomes extremely hot and should not be touched
while the machine is in operation. Allow the machine
to cool down completely before attempting to service
this area.
The second core receives its heat from the mixing of
both the engine exhaust and the vacuum pump
exhaust. The vacuum pump heats incoming air as it
is compressed. This hot air is mixed with the hot
engine exhaust gases exiting the first core. This
mixture of hot air and gases is then forced through
the middle core and on through the front heat
exchanger core.
The third core continues to extract heat from the
mixed gases; but, this heat is used to pre-heat the
water box as a preliminary hot water reservoir.
86313050 LEGEND GT 09/12/08