Glossary Of Terms - TMG -HW41T Product Manual

GLOSSARY OF TERMS

PSI – Pounds per square inch. Pressure washers are designed and rated to operate at a specific PSI.
Operating at pressures exceeding the maximum rating could result in damage to the unit and/or
SEVERE PERSONAL INJURY.
GPM – Gallons per minute. The orifice on the pressure wand assembly has been selected to deliver
up to the maximum GPM for your machine.
PRESSURE WAND ASSEMBLY – This refers to the gun, wand, and nozzle.
PUMP – The pump moves the water through the system and delivers it to the pressure wand
assembly.
UNLOADER VALVE – Is a valve located at the head of the pump for unloading water back into the
bypass when the trigger gun is shut off. It also reduces the load on pump when gun is off.
OIL, PUMP – The oil used within the pump to lubricate its operation. Important to use only SAE
15W/40 Non Detergent in the pump (see diagram).
OIL, GASOLINE ENGINE – Gasoline Engines need appropriate lubricant. Use SAE10W/30 detergent
oil.
BURNER – The burner heats the water in hot water pressure washers. It is located under the coil and
may be powered by furnace oil or diesel fuel.
MAXIMUM WORKING PRESSURE The water heater coils are designed to operate safely at normal
working pressure. Each machine is equipped with a safety pressure relief valve which prevents over
pressurization of the high pressure system. It is an important safety device and must not be tampered
with in any way.
TEMPERATURE CONTROL- The water heater is equipped with a temperature control which shuts
down the burner in the event of excessive outlet temperature caused by insufficient water flow
through the heater coil. Do not set thermostat above 195°F
PRESSURE SWITCH - A high pressure switch is used to control the burner. It is part of the burner
control system.
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