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CAUTION
Do not pressure wash the inside component terminal compartment (relay panel) as damage may
occur to electro-mechanical load step relays, motor and control circuits, safety circuits, and terminal
strip wiring. If splashed, ensure entire compartment is dry before covering.
WARNING
Pressure washing terminal compartment (relay panel) may lead to condensation and promote internal
arching.
Additional Preventative Maintenance Measures (as required)
1. The outside surface of the unit should be wiped or blown free of dust and dirt. Careful consideration
to controls, metering and relay compartment must be taken into account when pressure washing the
exterior of the enclosure. Ensure air intake and exhaust areas are clean and debris free. Blast or sand
any noticeable corrosion areas and cover with a suitable paint or coating.
2. Remove both side access panels and ensure all resistor terminal connections including wire, bus
jumper are tightened to 15 in-lb and ceramic tubes spring bushings are tightened to 9 in-lb. Inspect all
ceramic bushings and insulators for cracks. Replace all broken or cracked ceramic insulators. Ensure
all fan and safety component connections are tight. If required, it is safe to blow any dust from this
compartment using 40 PSI or less of clean, dry, compressed air. Replace any broken or failed
components. Reinstall access panel cover before proceeding with any enclosure maintenance.
3.
If resistor elements are extremely dirty, elements can be pressure washed. Pressures up to 40PSI
at a distance of two feet or greater may be used when cleaning the resistor elements. Pressure should
be reduced for the connection points and the distance from the nozzle to any insulator should not be
closer than four feet to prevent damage.
WARNING
Disconnect all sources of power to the unit (Main input Load Bus, external Blower Power,
External Control Power) prior to any inspection, service, or cleaning. Electric Shock Hazard
exists while connected.
For corrections requiring repair or replacement of components, contact the factory immediately
for further instruction.
Only those functions within the scope of normal maintenance are listed. This manual cannot list
all malfunctions that may occur, or corrective actions. If a malfunction is not listed or is not
corrected by listed corrective actions, notify the factory.
Note: When checking fuses for continuity, remove all fuses from fuse blocks, bus bars, fuse holders,
and disconnect switch. Test each fuse individually and out of circuit. A blown fuse left in the circuit may
check out OK with false reading of continuity due to feedback and return paths within the circuit.
