HydraMaster Boxxer 318 - Water and Chemical System; Water and Chemical Flow Operation

5-1: Water and Chemical System
5 - Water and
Chemical System
This section describes the water and chemical systems in the following areas:
Water and Chemical Flow Operation
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Water and Chemical Flow Diagrams
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WATER AND CHEMICAL FLOW OPERATION
Fresh water is brought through the front of the truckmount into the water box. The level of
water in the box is maintained by the use of a oat valve. The water is then gravity fed to
the pump where it is pressurized.
Next, the pressurized water enters the bypass valve. This valve allows manual adjustment
of the pressure level. When the valve at the wand is closed, nearly all of the water in the
system is recirculated to the water box at this point. When solution is being used at the
wand the necessary amount of high pressure water passes through the bypass valve and
to the heat exchanger.
The pressurized water then travels to the exhaust heat exchanger. In the nned tube heat
exchanger, the temperature of the water is raised to the selected cleaning temperature.
The heat necessary to do this is provided by both the engine and blower exhausts. The
heated water nally travels to the high pressure manifold.
The high pressure manifold houses both the temperature sensor for the heat control
system and a high temperature shutdown switch. There is an orice located in the
manifold, referred to as a recirculation (or primary) orice which allows a small amount
of high pressure, high temperature water to pass back to the water box. This prevents
excessive pressure building up in the heat exchanger when the wand valve is closed and
no solution is exiting the truckmount.
The water that is being called for by the wand then exits the manifold and passes through
a check valve. Finally, the water joins the chemical where the solution is created.
The chemical is pressurized by the HydraMaster diaphragm chemical pump attached
to the head of the water pump. This pump pulls the chemical from the jug through the
chemical meter. After being pressurized, the chemical travels through the metering valve
and is injected into the high pressure stream. This solution then exits the front of the
truckmount and is delivered to the cleaning tool.