Cooling And Silencing System, Functional Description; Lubrication System, Functional Description - Sullair DR13 125H Operator's Manual And Parts List

UNLOAD MODE -- 100+ PSIG (6.9+ BAR)
If the demand of compressed air falls below that
supplied by the package, the line pressure (P2) in-
creases. When the line pressure reaches the 100
psig (6.9 bar) setting programmed in the Supervi-
sor II, the inlet valve cylinder control solenoid is
deenergized, which closes the inlet valve (hydro
actuator retracted), and opens the blowdown valve
via the limit switch, unloading the package to the
state described in the Start Mode.
If the Supervisor II is operating in continuous
mode, the compressor runs unloaded until the line
(P2) pressure falls below the 90 psig (6.2 bar) set-
ting, at which point it proceeds to the Full Load
Mode.
If the Supervisor II is operating in automatic mode,
the compressor runs unloaded for a standard fac-
tory pre---set length of time, and the line pressure
(P2) does not fall below the 90 psig (6.2 bar) set-
ting, the compressor will stop at the end of this peri-
od. When the line pressure (P2) falls below the 90
psig (6.2 bar) setting, a Start Mode automatically
takes place, followed by package operation in the
Full Load Mode.
Figure 4 ---6 Lubrication System
COMPRESSOR SYSTEMS
4.6 COOLING AND SILENCING SYSTEM, FUNC-
TIONAL DESCRIPTION
Refer to Figure 4---4
by each compressor stage, it is sequentially routed
to:
S a silencer to reduce noise caused by the dis-
charged air.
S heat exchangers to cool the high temperature air
delivered by the oil---free screw compressor
stages.
combination separator/drains to eliminate liq-
S
uids condensed in the preceeding heat ex-
changers.
The LP stage silencer is a reactive pipework sized
to dampen lower frequency air pulses, while the HP
stage silencer is a reactive vessel sized to dampen
higher frequency pulses.
4.7 LUBRICATION SYSTEM, FUNCTIONAL DE-
SCRIPTION
Refer to Figure 4---5
Compressor delivers oil---free compressed air, but
it requires lubricant to maintain its high speed bear-
ings and gears in running order.
A gear---type pump draws lube oil from the base-
frame mounted sump and delivers it at a pressure
Section 4
and 4---5. As air is discharged
and 4---6. The DR---13 Series
13