Climate Control Series
Quincy Compressor
2022209100, August 2018
21
Manual Tank Drain Valve Operation
The manual tank drain valve on portable compressors and some stationary
compressors is located on the underside of the air tank. Portable compressors
can be tilted in the direction of the drain to allow removal of tank moisture.
Some tanks use an internal drain tube (Refer to
Fig. 3-11, Internal Drain
Tube
) to drain the moisture. Tank pressure is required to force moisture out
of the tank through the drain tube. Safe removal of tank moisture from the air
tank is dependent upon an internal tank pressure of no more than 30 PSIG
Higher internal tank pressures are dangerous and could cause serious injury!
Do not open a manual tank drain valve on any air tank containing
more than 30 PSIG of air pressure!
Never attempt to relieve an air tank by removing a pipe plug or
any other system component!
Oil and moisture residue must be drained from the air receiver
daily or after each use. Accumulations of oil residue in the receiver
can be ignited by embers of carbon created by the heat of compres-
sion, causing an explosion, damage to property and injury to per-
sonnel.
Manually Draining An Air Tank:
Step 1)
Disconnect & lockout the compressor from the power source (elec-
tric models) or disconnect the spark plug wire from the spark plug
(gas engine models).
Step 2)
Tank(s) subjected to freezing temperatures
may contain ice. Store the compressor in a heated area
before attempting to drain moisture from the tank(s).
Reduce the air pressure in the tank to 30 PSIG by pull-
ing the pressure relief valve ring (refer to
Fig. 3-12,
Checking Pressure Relief Valves & Relieving
System Pressure
).
Step 3)
Slowly open the drain valve and allow the
moisture and air mixture to drain from the tank.
Step 4)
Once the moisture has been completely
drained, close the drain valve.
Fig. 3-12 Checking Pressure Relief Valves
& Relieving System Pressure
WARNING !
WARNING !
WARNING !
