Description
OBSOLETE. CHECK WITH US FOR ALTERNATIVES.
The A4021 is a self-checking microprocessor based Valve Proving System (VPS), and it checks the effective closure of automatic shut-off valves by measuring the pressure differential between two valves during the test sequence. Subbase and pressure switch are required to complete the system. The intended application is for gas fired power burners and
other large capacity gas firing installations.
Specifications:
- Complete reference: A4021A1002 A4021A1010
- Based on 7800 SERIES Burner Programmer safety
technology.
- Testing independent of type of gas at any inlet
pressure.
- Valve proving done by using the line pressure of the
gas.
- Non-volatile lockout
- Automatic valve proving before heat demand, after
heat-demand or during pre-purge possible.
- Different test-times (per valve) available by different
O.S. numbers.
- Clear visual indication of the test sequence and
faults-causes through 5 LEDs.
- Storage of fault code when line interruption occurs
- Can be applied in all common valve configurations
- 2-wire gas pressure switch.
- Output for external alarm signal.
- Optional external remote reset.
- Enclosure: IP40
|
Reference |
Voltage (Vac) |
Test time** per valve (s) |
Power Consump. (W) |
Functional description |
|||
|
gas pressure switch |
3--valve config. |
remote reset |
alarm
output |
||||
|
A4021A1002 |
220 ...240 |
25 |
5 |
2-wire |
yes |
yes |
voltage free |
|
A4021A1010 |
100 ...120 |
25 |
5 |
2-wire |
yes |
yes |
voltage free |
** other times on request
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