7104192OWNER’S MANUALFigure 7 - Pressure Gauge Plug RemovalFanMotorFigure 6 - Air Output, Air Intake, and LintFiltersFlushSetscrewMotorShaftFigure 5 - Fan Cross SectionSERVICEPROCEDURESWARNING: Never serviceheater while it is plugged in, op-erating, or hot. Severe burns andelectrical shock can occur.UPPER SHELL REMOVAL1. Remove screws along each side ofheater using 5/16" nut-driver. Thesescrews attach upper and lower shellstogether.2. Lift upper shell off.3. Remove fan guard.FANIMPORTANT: Remove fan from motor shaftbefore removing motor from heater. Theweight of the motor resting on the fan coulddamage the fan pitch.1. Remove upper shell (see above).2. Use 1/8" Allen wrench to loosen set-screw which holds fan to motor shaft.3. Slip fan off motor shaft.4. Clean fan using soft cloth moistenedwith kerosene or solvent.5. Dry fan thoroughly.6. Replace fan on motor shaft. Place fanhub flush with end of motor shaft (seeFigure 5).7. Place setscrew on flat of shaft. Tightensetscrew firmly (40-50 inch-pounds).8. Replace fan guard and upper shell.AIR OUTPUT, AIR INTAKE,AND LINT FILTERS1. Remove upper shell (see Upper ShellRemoval, column 1).2. Remove filter end cover screws using5/16" nut-driver.3. Remove filter end cover.4. Replace air output and lint filters.5. Wash or replace air intake filter (seePreventative Maintenance Schedule,page 5).6. Replace filter end cover.7. Replace fan guard and upper shell.IMPORTANT: Do not oil filters.PUMP PRESSUREADJUSTMENT1. Remove pressure gauge plug from filterend cover.2. Install accessory pressure gauge (partnumber HA1180).3. Start heater (see Operation, page 5).Allow motor to reach full speed.4. Using a flat blade screwdriver, adjustpressure. Turn relief valve to right toincrease the pressure. Turn relief valveto left to decrease the pressure. Setpump pressure at 5.3 PSI.5. Stop heater (see Operation, page 5).6. Remove pressure gauge. Replace pres-sure gauge plug in filter end cover.Figure 4 - Upper Shell RemovalUpperShell FanGuardFan GuardAir Intake FilterAir Output FilterFilter End CoverLint FilterReliefValvePressureGaugePlugPressureGaugeFigure 8 - Adjusting Pump PressureContinued