Honeywell A4021 Series User Manual

14
EN2R--9023 9705R0--NE
APPLICATIONS WITH EC7850
20
LINE
NEUTRAL
EC7850
N3
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
V1INLGPS / HD
10
OUT
11
VENT
13 15
V1OUT
16
RBHD
12
HD--OUT
1432
NO
1 7
V2IN
8
V2OUT
4 5 6
NNN
ALARM
IN
RESET
LINEext.
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
N3
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
PV2PV1
HI
LO
A4021A
GPS
9
V1INLGPS / HD
10
OUT
11
VENT
15
V1OUT
16
RBHD
12
HD--OUT
1432
NO
1 7
V2IN
8
V2OUT
4 5 6
NNN
ALARM
IN
RESET
LINEext.
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.

Honeywell A4021 Series Specifications

General

Brand	Honeywell
Model	A4021 Series
Category	Control Unit
Language	English