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a4021a1002sz20
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The A4021 is a self-checking microprocessor based Valve Proving System (VPS). The A4021 checks the effective closure of automatic shut-off valves by measuring the differential pressure between two valves during the test sequence.
• The A4021 is specially designed to be used as proving system to check the effective closure of the valves before burner start up (pre-configuration) or at the end of a heat demand (post-configuration).
Approvals CE approved (50Hz) according EN1643:2000 (spare part ONLY for non-MD applications installed before 2017)
Protection class IP40, only with subbase ZL030001
Ambient temperature -10 ... 60 oC
Maximum humidity 95 %rh
Note To be used in Europe only as spare part. For new installations the Kromschroeder TC 2 or TC 3 can be used. For details visit http://www.docuthek.com (copy/paste link into web browser)
Operation Automatic
Runtime 60 s
Comment Test time per valve 25sec.
Additional description
• Remote reset.
• Alarm output potential free NO contact.
• Uses the NO contact of a standard gas pressure switch, that is set to 1/2x the nominal inlet pressure.
• Suggested gas pressure switches: C6097 series C60VR40xxx series DG series
230Vac versions
OutputsTypeDownloads
  TXTPDF
1xSPSTA4021A1002 TXT
PDF
Product handbook (English) Installation/mounting instruction (English) Brochure (English) Brochure (German) Application manual (English) Certificate (English)
115Vac versions
OutputsTypeDownloads
  TXTPDF
1xSPSTA4021A1010 TXT
PDF
Product handbook (English) Installation/mounting instruction (English) Brochure (English) Brochure (German) Certificate (English)
24Vac versions
OutputsTypeDownloads
  TXTPDF
—A8021A10030 TXT
PDF
Product handbook (English) Installation/mounting instruction (English) Brochure (English) Brochure (German) Certificate (English)
Accessoires
c60vr40-nl05
Downloads
c60vr40-nl05colres.jpgDownloads
c60vr40-nl05bwhres.tifDownloads
C60VR40
c6097a4be04
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c6097a4be04colres.jpgDownloads
c6097a4be04bwhres.tifDownloads
C6097A4
DescriptionAdditional Product TypeDownloads
 TXTPDF
Subbase for A4021A series.ZL030001 TXT —
Miniature gas pressure switch flanged, for direct mounting on VQ4xx or VR4xx dual solenoid valves (2..17 mbar). C60VR40017 TXT
PDF
Specification sheet (English)
Miniature gas pressure switch flanged, for direct mounting on VQ4xx or VR4xx dual solenoid valves (5..40 mbar). C60VR40040 TXT
PDF
Specification sheet (English)
Miniature gas pressure switch flanged, for direct mounting on VQ4xx or VR4xx dual solenoid valves (30..110 mbar). C60VR40110 TXT
PDF
Specification sheet (English)
Gas pressure switch 1/4" BSP (1..10 mbar).C6097A4110 TXT
PDF
Specification sheet (English)
Gas pressure switch 1/4" BSP (2,5..50 mbar).C6097A4210 TXT
PDF
Specification sheet (English)
Gas pressure switch 1/4" BSP (30..150 mbar).C6097A4310 TXT
PDF
Specification sheet (English)
Gas pressure switch 1/4" BSP (100..500 mbar).C6097A4410 TXT
PDF
Specification sheet (English)
Kromschroeder alternatives for A4021/A8041 Valve Proofing System. Replaces both the control unit and gas pressure switch. Only needs extra tube connection upstream the first valve.
tc2-be04
TC2
DescriptionAdditional Product TypeDownloads
 TXTPDF
Functional replacement for A4021A1002 (220/240Vac). Replaces the gas pressure switch that monitors the pressure between valve 1 and 2. Additional tube is needed to measure the pressure upstream of the first valve.TC2R05W/W TXT
PDF
Specification sheet (English)
Functional replacement for A4021A1010 (110/120Vac). Replaces the gas pressure switch that monitors the pressure between valve 1 and 2. Additional tube is needed to measure the pressure upstream of the first valve. TC2R05Q/Q TXT
PDF
Specification sheet (English)
Functional replacement for A8021A1003 (24Vdc). Replaces the gas pressure switch that monitors the pressure between valve 1 and 2. Additional tube is needed to measure the pressure upstream of the first valve. TC2R05K/K TXT
PDF
Specification sheet (English)