TM 9-4940-342-14&P Table 2-1.  Operating Controls and Instruments Figure 2-1 index no. Control Function -1 Burner switch "Low" Turns the low fire burner ignition ON and OFF. -2 Burner flameout reset light Indicates flame out, due to a malfunction of burner. -3 Burner switch "High" Turns the high fire burner ignition ON and OFF. -4 Pump control switch Turns the pump motor, fuel pump and blower ON and OFF. -5 Hourmeter Indicates elapsed time pump control switch has been ON to the steam cleaner. -6 Back pressure gage Indicates back pressure of the water at the coil inlet. -7 Soap control valve Controls the amount of soap being mixed to the pump inlet water supply. -8 Selector valve Controls the water volume going into the coils, if closed (vertical) 600 GPH. -9 Soap fill and stir valve Allows soap tank to be filled with water prior to burner operation and agitated (hot) after burner operation. -10 Temperature gage Indicates the steam temperature at the outlet side of the coils. -11 Steam pressure gage Indicates the outlet steam pressure. -12 Pressure relief valve Releases excessive steam pressure. Set at 400 psi. -13 Fuel fill spout Burner fuel is added through this port. -14 Solution tank drain For draining soap solution. -15 Soap check valve Prevents supply water from backing up into soap tank. -16 By-pass valve Provides a safety in event of excessive water pressure from pump, returns excess water to suction side of pump. Set at 370 psi. -17 Shut-off valve (reservoir) Shuts off and allows the suction of water from auxiliary supply. Shut off only when using auxiliary source (22). -18 Water inlet connection Pressurized water source is connected to this location. -19 Float valve assembly Controls amount of water from outside pressurized water source in reservoir. -20 Disconnect switch Turns ON and OFF the main (220 volts) power source to cleaner. -21 Motor reset switch Prevents an overload of cleaner circuits. Manually reset in the event of an overload. -22 Auxiliary water valve and connector. Permits the use of auxiliary water supply. -23 Reservoir overflow and drain Allows excess water in reservoir to spill out. Remove pipe nipple to drain. -24 Excessive discharge pressure switch Monitors discharge pressure and shuts unit down after an excess pressure rise. Set at 350 psi. -25 Burner/reset switch Manually resets after a shutdown of main burner in the event of a flameout. -26 High temperature switch Manually reset overtemperature switch after an overtemperature condition has occurred. Set at 370°F. -27 Air pressure switch Shuts down unit in event of insufficient air pressure and automatically resets. Set at 1.5 inch (WCP). -28 Low water pressure switch Senses inadequate water supply to coil. If water supply is inadequate, it shuts down the fuel to burners. Set at 15 psi minimum to actuate (close contacts). -29 Oil solenoid valves (2) Turns ON and OFF the oil burners automatically. FWD valve is high fire burner. AFT valve is low fire burner. -30 Oil pressure switch Shuts down burner if oil pressure drops below 45 psi. Allows burner to fire when 85 psi is achieved by fuel pump. Controls oil valves (29). Excess oil is recirculated to oil tank when burners are turned down. -31 Air dome drain valve Used to drain air cushion chamber daily or after every 4 hours of operation. This valve is a drain valve from coils and is used to discharge excess water from the coils, cleaning and descaling of the coils. -32 Discharge valves (2) Controls steam discharge for one or two gun operation. One valve must be open at all times. -33 On-fuel-off valve Manually turns ON and OFF the fuel oil to burners. -34 Pressure and temperature control high-low valve (thermostat) Controls flow of oil through oil valves (29) and is controlling the steam temperature by regulating amount of fuel. Adjustment by turning CW decreases temperature, CCW increases temperature. Set at 325°, for vapor operation, or set lower for hot rinse at approximately 185-200°. -35 Soap fill port Soap is placed in soap tank through this port. -36 Fuse Control circuit protection 6 amp fuse. -37 Blow-down switch Overrides low water pressure switch (28) to permit burner operation during the blowdown of coils. -38 Air dome vent Provides venting of air dome during draining operation. -39 Fuel strainer valve Fuel tank shut-off valve between tank and strainer. -40 Fuel tank drain valve To drain excess fuel from fuel tank. 6