Algas SDI VAPORAIRE M-Series, Operation & Maintenance Manual

Page: 37 / 72

Operation
SDI Operations & Maintenance Manual – 54264
4-29
CAUTION
The pressure adjustment potentiometers are one turn
potentiometers. Do not turn beyond the limits!
Table 2 - Mixed Gas Pressure and Setpoint Ranges
Mixer Delivery
Pressure
Pressure Scale
Range
Pressure Setpoint
Range
Coarse Pressure
Setpoint Range
Fine Pressure
Setpoint Range
Input I-01 Input I-02 POT. CH0 POT. CH3
5 – 10 0 0 3 - 12 PSI 0 - 1 PSI
12 – 15 0 1 10 - 22 PSI 0 - 1 PSI
21 – 30 1 0 19 - 35 PSI 0 - 1 PSI
31 – 40 1 1 32 - 48 PSI 0 - 1 PSI
0 = Input not jumped to 24vdc (B3), LED input status
OFF
(Input I-01 and I-02)
.
1 = Input jumped to 24vdc (B3), LED input status
ON
(Input I-01 and I-02)
.
HIGH MIXED GAS PRESSURE SWITCH
The High Mixed Gas Pressure Safety Switch shuts down the mixer if there a
Mixed Gas Operating Pressure Control Switch failure. The High Mixed Gas
Pressure switch is a mechanical switch located in the control box. The High
Mixed Gas Pressure Switch is wired normally closed and will open when High
Mixed Gas pressure setpoint is exceeded.
Adjusting High Mixed Gas pressure setpoint ( Refer to data sheet for setpoint ).
Control box must be open to adjust.
1. To set, turn the adjusting wheel to the approximate setting shown on the
indicator scale on the switch (indicator on the front of the switch is only a
guide). Turning the wheel counterclockwise decreases the pressure setting
and turning it clockwise increases the setting. The, pressure should be
adjusted using a calibrated pressure gauge. The High Mixed Gas Pressure
Switch is set 3 PSI above the mixed gas operating pressure.
EXAMPLE:
8 PSIG Mixed Gas Pr 3 PSI = 11 PSIG High Mixed Gas
Pressure Setpoint
See Troubleshooting Section Table 3 for annunciator display on the
SEQUENCER
.
HIGH MIXED GAS PRESSURE SAFETY BACKUP (NO ADJUSTMENT REQUIRED)
The High Mixed Gas Pressure Safety Backup shuts down the mixer if the High
Mixed Gas Pressure Switch fails. The High Mixed Gas Pressure Safety Backup
is a part of the
SEQUENCER
programming. The High Mixed Gas Pressure
Safety Backup is a setpoint that is not adjustable. The High Mixed Gas Pressure
Safety backup is set 5 PSI above the mixed gas operating pressure setpoint.
EXAMPLE:
8 PSIG Mixed Gas Pr 5 PSI = 13 PSIG High Mixed Gas
Pressure Backup Setpoint.
See Troubleshooting Section Table 3 for annunciator display on the
SEQUENCER.