Section 24- Alarm Test; Alarm And Sensor Tests; Power Loss Alarm; Low Pressure Test - Invacare Perfecto 2 Series Service Manual

SECTION 24— ALARM TEST

Alarm and Sensor Tests

To prevent electrical shock, ALWAYS disconnect concentrator from electrical outlet
before servicing.
Check alarms periodically for proper function.

Power Loss Alarm

With the unit running, remove the line cord from power source. The power loss alarm
mode should sound the audible alarm IMMEDIATELY or within 30 seconds.
NOTE: With the unit unplugged and inoperable for a short period of time, the battery free circuit
will be drained. If power failure alarm does not sound with unit unplugged and power switch on,
the battery free circuit is drained. It will recharge when unit is plugged in and switched on.

Low Pressure Test

NOTE: For this procedure, refer to FIGURE 24.1 on page 82.
1. There are two separate failure modes for Low Pressure:
• Low product tank pressure. (Pressure in tank drops below a preset value, typically
7 p.s.i.).
• Failure to reach the set point pressure within a prescribed time limit, or Timeout
Failure.
Test One
1. With unit running, set flow at maximum rating.
2. When the main valve switches, pull the stem on the compressor relief valve out as far
as it will go and hold it.
3. The low pressure alarm should activate within 30 seconds. Refer to SensO
Threshold on page 84 for shutdown mode.
Test Two
1. With unit running, set flow at maximum rating.
2. Remove the pressure sensor tubing (tie-wrap) from the top of the product tank (not
shown).
3. The low pressure alarm should activate within 30 seconds. Refer to SensO
Threshold on page 84 for shutdown mode.
Part No 1148070
DANGER
81
SECTION 24—ALARM TEST
Alarm
2
Alarm
2
Perfecto
™
2