
20
GENERAL MAINTENANCE (Cont'd.)
CENTRIFUGAL UNLOADER AND UNLOADER PRESSURE RELEASE VALVE:
The centrifugal unloader is operated by two governor weights. It is totally enclosed and lubricated from
the crankcase of the compressor. When compressor starts, the governor weights automatically open
compressing the main spring, allowing the unloader pressure release valve to close. When the
compressor stops, the main spring returns the governor weights to normal position opening the
unloader pressure release valve and unloading the compressor. This prevents overloading the motor
when starting. If air continues to escape through the governor or unloader pressure release valve
while operating, this is an indication that the unloader pressure release valve is not closing tightly and
may be held open by foreign substance which has lodged on the seat. In order to correct this, remove
the governor release valve cap, giving access to unloader pressure release valve spring and ball.
Clean thoroughly and return parts in the same order in which they were removed. Loose drive belts
can also cause unloader to leak by preventing the compressor from reaching proper speed. (See
“BELTS” above).
CHECK VALVE:
The check valve closes when the compressor stops operating, preventing air from flowing
out of the tank through the pressure release valve. After the compressor stops operating, if air
continues to escape through the release valve, it is an indication that the check valve is leaking. This
can be corrected by removing check valve and cleaning disc and seat. If check valve is worn badly,
replace same.
Before removing check valve be sure all air is drained out of tank and power is disconnected.
Failure to do so may result in injury or equipment damage.
THE INTERSTAGE PRESSURE RELIEF VALVE
is provided to protect against interstage over pressure and
is factory set for maximum pressure of 75 PSIG.
DO NOT RESET
If the pressure relief valve pops, it indicates trouble. Shut down the unit immediately and determine
and correct the malfunction. Inspect the head valves. Serious damage can result if not corrected and
can lead to complete destruction of the unit. Tampering with the interstage pressure relief valve, or
plugging the opening destroys the protection provided and voids all warranty.
COMPRESSOR LUBRICATION:
Fill crankcase to proper level as indicated by oil sight gauge. Keep
crankcase filled as required by usage. It is recommended that only Champlub recip lubricant be used.
This is a 30-weight, non-detergent industrial oil with rust and oxidation inhibitors specially formulated
for reciprocating compressors. Do not mix oil types, weights or brands.
MOTOR LUBRICATION:
Long time satisfactory operation of an electric motor depends in large measure on
proper lubrication of the bearings. Bearing grease will lose its lubricating ability overtime, not
suddenly. Refer to the motor manufacturer
’s instructions for the type of grease and lubrication
intervals.
Содержание CADRSASP12
Страница 10: ...9 FIGURE 1 DUPLEX CONTROL PANEL WIRING DIAGRAM ...
Страница 12: ...11 INSTALLATION CONT D CIRCUIT BREAKERS 1 Factory wired No wiring required Figure 3 Circuit Breaker ...
Страница 13: ...12 INSTALLATION CONT D MOTOR CONTACTORS 1 Factory wired No wiring required FIGURE 4 MOTOR CONTACTORS ...
Страница 15: ...14 INSTALLATION CONT D LOW OIL LEVEL MONITOR 1 Factory wired No wiring required FIGURE 6 LOW OIL LEVEL MONITOR ...
Страница 16: ...15 INSTALLATION CONT D ELECTRIC TANK DRAIN 1 Factory wired No wiring required FIGURE 7 ELECTRIC TANK DRAIN ...
Страница 25: ...24 PARTS ILLUSTRATION MODEL CADRSASP12 307CAD810 A Ref Drawing ...
Страница 27: ...26 DUPLEX CONTROL PANEL MOUNTING 305CAD810 A Ref Drawing ...
Страница 39: ...38 UNIT HAZARD DECALS ...
Страница 40: ...39 PUMP HAZARD DECALS F ...