Prochem Legend XL - Manual (Page 18)

OPERATION
86037400 02/16/07
3-8
SOLUTION
OUTLET
WATER
INLET
CHEMICAL
INJECTION
WASTE TANK
WATER BOX
WATER PUMP KOHLER ENGINE
VACUUM EXHAUST
HEAT EXCHANGERS
THERMO
RELIEF
TO PRESSURE
GUAGE
OUTLET CHECK VALVE
PRESSURE REGULATOR
= COLD WATER
= WARM WATER
= HOT WATER
= NO WATER
TEMPERATURE
CONTROL BYPASS
ACCUMULATOR
OUTLET Y STRAINER
Always wear hearing protection and proper
personal protection equipment when operating
unit.
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 then flows from the water box, through a
strainer, into the water pump where it is pumped to
the pressure regulator manifold where the pressure
regulator provides and maintains the desired
pressure setting.
The pressure regulator manifold includes a nitrogen
charged accumulator which helps reduce pressure
spikes from the pump.
A certain amount of water is by-passed from the
pressure regulator due to over pumping capacity of
the water pump. Water that is not called for in the
cleaning process is channeled through a heat
exchanger box into the first heater core from the
front of the unit. This bypass water may circulate
several times through the bypass heat exchanger
allowing the water to be pre-warmed.
The next stage of plumbing and heat exchange
takes place in the 2nd and 3rd heater core located in
the heater box. This is the hottest point of the
gases coming from the vacuum pump and the
engine. These hot gases are forced through heater
core #2 and #3 creating the second stage of heat
transfer to the cleaning solution.
Finally, the hot solution passes to the 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.