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Honeywell A4021 Series, Product Handbook, Page: 15 / 21

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Honeywell A4021 Series Product Handbook Download Page 15

14

EN2R--9023 9705R0--NE

APPLICATIONS WITH EC7850

20

LINE

NEUTRAL

EC7850

N

3

AL

4

L1

5

FAN

6

RT

7

LD2

8

PV1

9

MV

10

IGN

F

flame--

signal

G

ground

13

COM

12

HI

15

LOW

14

MOD

16

C.V.

18

ES1

17

ES2

19

ES3

LOS

21

PV2

22

SHTR

EARTH

ALARM

(intermittent)

(interrupted)

gas supply

V1

V2

H.D.

open atmosphere

vent--

valve

L.G.P.S.

EXTERNAL

RESET

A4021A

GPS

9

V1IN

LGPS / HD

10

OUT

11

VENT

13

15

V1OUT

16

RBHD

12

HD--OUT

14

3

2

NO

1

7

V2IN

8

V2OUT

4

5

6

N

N

N

ALARM

IN

RESET

LINE

ext.

burner

FAN

flame--rod

ign.

P.S.

lock--out switch

L.G.P.S.

Fig. 14. Wiring diagram A4021A-- EC7850 pre--configuration: intermittent pilot and vent--valve to open atmosphere

13

LINE

NEUTRAL

EC7850

N

3

AL

4

L1

5

FAN

6

RT

7

LD2

8

PV1

9

MV

10

IGN

F

flame--

signal

G

ground

13

COM

12

HI

15

LOW

14

MOD

16

C.V.

18

ES1

17

ES2

19

ES3

20

LOS

21

PV2

22

SHTR

EARTH

ALARM

FAN

flame--rod

H.D.

ign.

P.S.

(intermittent)

(interrupted)

gas supply

V1

V2

PV2

PV1

HI

LO

A4021A

GPS

9

V1IN

LGPS / HD

10

OUT

11

VENT

15

V1OUT

16

RBHD

12

HD--OUT

14

3

2

NO

1

7

V2IN

8

V2OUT

4

5

6

N

N

N

ALARM

IN

RESET

LINE

ext.

EXTERNAL

RESET

lock--out switch

L.G.P.S.

L.G.P.S.

Fig. 15. Wiring diagram A4021A -- EC7850: pre--configuration, intermittent pilot, 4--valve configuration

WARNING

These are general wiring diagram and have not been
approved yet by an official approval body. Depending
on the application and used ignition controller special
wiring diagrams maybe required.

Summary of Contents for A4021 Series

Page 1: ...plete the system When during the test sequence of the A4021 a failing valve is detected the A4021 will go into a non volatile lock out sta tus generates an alarm and prevents a burner start up The intended application is for gas fired power burners and other large capacity gas firing installations where according to the European norm EN676 a valve proving system can be used as an alternative for p...

Page 2: ...Use of terminal 12 10 Fail safe relay drivers 10 Anti recycle counter 10 Calculations 11 General 11 Calculation examples 11 Installation and wiring 12 Installation 12 Mounting Wiring Subbase 12 Wiring 12 General considerations 12 Wiring 12 Pressure switch 12 General wiring diagrams 13 Applications with EC7850 14 Checkout 17 Final checkout of the installation 17 Troubleshooting 18 Standards and App...

Page 3: ... chamber EN676 prescribes a valve proving system for capacity rating over 1 200 kW see Table 1 Table 1 Application valve proving systems according EN676 Heat Input With Pre Purge Without Pre Purge p kW Main Gas Start Gas Main Gas Start Gas kW 10 10 10 10 70 2 x B B 2 x B 2 x A or 2 x B VPS A 2 x A 70 1200 2 x A 2 x A 2 x A 2 x A VPS 2 x A 2 x A 1200 2 x A VPS 2 x A 2 x A 2 x A VPS 2 x A 2 x A NOTE...

Page 4: ...ressure 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 swit...

Page 5: ... S G P S gas air Servo Motor MT4000 Series Combi valve VQ400 Series Valve Proving System A4021 Series burner controller 7800 SERIES Gas pressure switches C6058A Series Fig 4 System set up Working principle The A4021 valve proving system is based on the pressure status principle This means that the valves are checked by means of measuring on off the pressure in the gas pipe between the two safety v...

Page 6: ...elf test 10 alarm error during test valve 1 indefinite 11 alarm valve 1 failing leaking 5 indefinite 12 alarm error during test valve 2 indefinite 13 alarm valve 2 failing leaking 5 indefinite 14 alarm error heat demand indefinite 15 alarm self test error 4 indefinite 1 Timings depending on O S numbers shown A4021A1002 1010 2 STANDBY can be infinite time period 3 Depending on pre purge and start u...

Page 7: ... demand lock out start heat demand reset burner controller Leak test GPS Valve V1 Vent valve normally open Valve V2 Leak test GPS Valve V1 Vent valve normally open Valve V2 PRE POST CONFIG CONFIG start whithout valve proving Fig 6 System sequence of A4021A in post and pre configuration 6 EN2R 9023 9705R0 NE ...

Page 8: ...21A should be externally fused to prevent damage to the valve proving system wiring or peripherals External fuse 16 A slow max Internal fuse 5 A slow max Power consumption Maximum 4 5 VA Electrical ratings Valve outputs 4A cos ϕ 0 7 Vent valve output 1A cos ϕ 0 7 Ignition controller output 4A cos ϕ 0 7 Alarm output 2A cos ϕ 0 7 Electrical connection 4 Wiring conduit according to PG11 are provided ...

Page 9: ...external devices n a 6 N N power Neutral for external devices n a 7 V2 IN V2 IN input Valve 2 voltage from ignition controller n a 8 V2 OUT V2 OUT output Output connect with Valve 2 4A 9 HD LGPS input Heat demand input pre configuration or LGPS input post configuration n a 10 ALARM ALARM input Alarm input 4A 11 ALARM ALARM output Alarm output 2A 12 RB RB input Read back signal for heat demand post...

Page 10: ... 6 7 5 4 3 2 1 8 9 10 11 12 13 14 15 16 16 PG11 88 97 Fig 7 Mounting dimensions of A4021A and subbase in millimeters 74 5 80 96 60 5 80 96 8 5 34 5 86 5 52 69 4 5 4x 3 90 103 20 Fig 8 Mounting bracket A4021A for VQ400 and VE5000 Series in millimeters ...

Page 11: ... terminal 12 and14 are connected If terminal 12 is not connected the A4021A will raise an alarm error heat demand Fail safe relay drivers The fail safe relay drivers which are used to give the heat demand to the burner controller are fail safe Anti recycle counter For reason that during each valve proving a small amount of gas enters the combustion chamber extra safety provisions are build in to p...

Page 12: ... 9 10 13 5 65F 3 2 4 9 7 5 8 2 9 8 3 3 80F 4 4 6 9 9 4 12 14 5 0 100F 6 5 10 5 14 4 18 22 7 9 NOTE T Thread F Flange V0m volume of 2 valves with L 0 m IMPORTANT The total volume Vp has to be calculated with all volumes between the tested valves internal volumes of valves and all pipes Calculation examples Example 1 Calculate the maximum pipe length between two 1 1 2 safety valves when an A4021A va...

Page 13: ...ring must comply with all applicable codes ordiances and regualtions 5 After moving the A4021A valve proving system from outdoor to indoor conditions condensation may occur Do not connect condensated valve proving system to mains 6 The A4021A is not suitable for phase phase mains can only be used with phase neutral mains 7 For each application diagram local approval may be needed General considera...

Page 14: ...uration LGPS GPS Valve Proving System A4021A 6 N V2 8 10 ALARM vent valve 11 13 Ignition controller 4 N N L 1 2 T ext 12 14 heat demand input 9 15 main output V1 16 5 N reset fuse 3 L N 16A Vp 7 pilot output valve valve Fig 12 wiring diagram 3 valve configuration pre configuration LGPS GPS Valve Proving System A4021A 6 N V2 8 10 ALARM vent valve 11 13 Ignition controller 4 N N L 1 2 ext heat deman...

Page 15: ...t pilot and vent valve to open atmosphere 13 LINE NEUTRAL EC7850 N 3 AL 4 L1 5 FAN 6 RT 7 LD2 8 PV1 9 MV 10 IGN F flame signal G ground 13 COM 12 HI 15 LOW 14 MOD 16 C V 18 ES1 17 ES2 19 ES3 20 LOS 21 PV2 22 SHTR EARTH ALARM FAN flame rod H D ign P S intermittent interrupted gas supply V1 V2 PV2 PV1 HI LO A4021A GPS 9 V1IN LGPS HD 10 OUT 11 VENT 15 V1OUT 16 RBHD 12 HD OUT 14 3 2 NO 1 7 V2IN 8 V2OU...

Page 16: ...em with 3 valve configuration LINE NEUTRAL EC7850 N 3 AL 4 L1 5 FAN 6 RT 7 LD2 8 PV1 9 MV 10 IGN F flame signal G ground 13 COM 12 HI 15 LOW 14 MOD 16 C V 18 ES1 17 ES2 19 ES3 20 LOS 21 PV2 22 SHTR EARTH ALARM FAN flame rod H D ign P S intermittent interrupted A4021A GPS 9 V1IN LGPS HD 10 OUT 11 VENT 13 15 V1OUT 16 RBHD 12 HD OUT 14 3 2 NO 1 7 V2IN 8 V2OUT 4 5 6 N N N ALARM IN RESET LINE ext EXTER...

Page 17: ...BY SELF RUN MODE OPERATE BURNER valves operated by ignition controller WAIT START UP 3 3 25 25 TEST GPS GPS TEST ERROR SELF Modes States 0 1 2 3 4 5 6 7 8 9 11 12 14 15 DEMAND HIGH TEST STANDBY Line voltage TEST LOW FOR OPERATION Sequence of operation V2 ERROR 10 V2 13 FAILING LEAKING V1 FAILING LEAKING WARNING No standard valve proving after lock out of the ignition controller blinking LED LED is...

Page 18: ... and neutral are correct connected on the A4021A Exchanged connection of the phase and neutral can lead to hazardous situations when a short circuit in one of the valve connections occurs Therefore the A4021A can only be used with fixed wiring for the line voltage connections Make sure that phase and neutral are connected as instructed in the Wiring section Final checkout of the installation Set t...

Page 19: ... A4021A NOTE Instructions for replacing the cover and fuse are given in the Service section Before making a replacement make sure you have the correct part check its part number and voltage rating Table 5 Troubleshooting A4021A Series valve proving System States ALARM V2 PWR RUN V1 OK Alarm mode Cause Action 10 Error V2 V2 is damaged or V2 is wrong not connected Check connections V2 and if necessa...

Page 20: ... 6 ENV 50141 immunity to injected currents EN 50081 2 emission industrial level IEC 1000 4 2 electrostatic discharges IEC 1000 4 5 surges IEC 1000 4 11 voltage interruptions and decreases IEC 1000 4 4 fast transient bursts Standards and Approvals summarized The A4021A Series Valve Proving System is conform with the following EC directives Gas Appliance Directive 90 396 EEC PIN CE 0063AS1822 Low Vo...

Page 21: ...oving System O S Number Rated V lt Test time l Power C Enclosure Functional description Remarks Voltage Vac per valve s Consump W gas pressure switch 3 valve config remote reset alarm output A4021A1002 220 240 25 5 IP40 2 wire yes yes voltage free New without subbase A4021A1010 100 120 25 5 IP40 2 wire yes yes voltage free New without subbase ZL030001 100 240 n a n a n a n a n a n a n a Subbase fo...

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