F-1031, Section 2119
Page 19 of 24
Air Compressor Pressure Mode: AUTO
Air pressure matches water discharge pressure.
With the compressor engaged, running and the Auto-
Sync control panel switched to “AUTO”, the following oc-
curs:
·
The black solenoid is energized and is CLOSED and
the yellow solenoid is OPEN.
·
The master pressure gauge registers compressor
sump tank pressure.
·
The shuttle valve is closed. The compressor inlet
pressure is lower than the compressor discharge
pressure.
·
The fixed air regulator is not the primary control de-
vice. It functions as a governor (or maximum pressure
setting) in the “AUTO” mode.
·
The balance valve is the primary control air regulating
device in the “AUTO” mode (see Balance Trim Valve
Function).
·
If the compressor discharge air pressure is above wa-
ter pressure (for example: 100 psi / 8.6 bar) (see Air
Inlet Valve Function), then the balance valve opens al-
lowing the control air pressure to close the air inlet
valve and lowering control air pressure below 100 psi
(8.6 bar). When the discharge air pressure is below
the water pressure (100 psi / 8.6 bar), the balance
valve closes. The control air pressure is not high
enough to keep the air inlet valve closed. The air inlet
valve opens allowing air into the compressor raising
the control air pressure above 100 psi (8.6 bar).
·
The balance valve opens and closes as needed as
the air or water discharge pressure changes so the
water and air pressure remain the same.
NOTE: Control air is always being released and pressure relieved through the air inlet trim valve (AITV) and out
the air bleed outlet. This air release is controlled (limited) by the AITV.
NOTE: The balance trim valve (BTV) is used to calibrate the control air circuit in the “AUTO” mode. Refer to the
Electric Auto-Sync calibration procedure.
Air Compressor Mode: Auto
Red Hose
Red Hose
Blue Hose
Gray Hose
Water Pressure
Air Pressure
Y
e
ll
o
w
Ho
s
e
Re
d
H
o
s
e
Bl
u
e
H
o
s
e
Black Hose
Black Solenoid
(Closed)
Master Air Pressure Gauge
Water Pump
Balance Valve
(Open)
Balance
Trim Valve
(BTV)
Shuttle Valve
(Closed)
Minimum
Pressure
Valve
Air / Oil Separator
Air Inlet
Valve
Air Inlet Valve
from Air Filter
Air Inlet Trim Valve (AITV)
Air Bleed Off
Fixed Air Regulator (Closed)
Oil Scavenger Line
(Matches Water Pump Pressure)
Black Hose
Yellow Solenoid
(Open)
Air Discharge
Manifold
(Matches Water Pump
Pressure)
Air
Compressor
NOTE: If water pressure exceeds 150 psi (10.3 bar), the Fixed Air Regulator will take
over control and keep air pressure at 150 psi (10.3 bar).
