Applications With Ec7850 - Honeywell A4021 Series Product Handbook

APPLICATIONS WITH EC7850

ground AL
G N 3
ALARM
LINE
NEUTRAL
EARTH
EXTERNAL
RESET
1 2 3 4
NO ext. LINE N
GPS RESET
Fig. 14. Wiring diagram A4021A-- EC7850 pre--configuration: intermittent pilot and vent--valve to open atmosphere
ground AL
G N 3
ALARM
LINE
NEUTRAL
EARTH
EXTERNAL
RESET
1 2 3 4
NO ext. LINE N
GPS RESET
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.
(interrupted)
L1 FAN RT LD2 PV1 MV
4 5 6 7 8 9
P.S.
FAN
H.D.
5 6 7 8 9 10 11
N N V2IN V2OUT LGPS / HD IN OUT
ALARM
A4021A
(interrupted)
L1 FAN RT LD2 PV1 MV
4 5 6 7 8 9
P.S.
FAN
5 6 7 8 9 10 11
N N V2IN V2OUT LGPS / HD IN OUT
ALARM
A4021A
EC7850
flame--
IGN signal HI COM MOD LOW C.V.
10 F 12 13 14 15 16
flame--rod
ign.
gas supply
12 13 14 15 16
RBHD VENT HD--OUT V1IN V1OUT
EC7850
flame--
IGN signal HI COM MOD LOW
10 F 12 13 14 15
lock--out switch
flame--rod
ign.
H.D.
L.G.P.S.
12 13 14 15 16
RBHD VENT HD--OUT V1IN V1OUT
14
(intermittent)
ES2 ES1 ES3 LOS PV2 SHTR
17 18 19 20 21 22
lock--out switch
open atmosphere
L.G.P.S.
V1
L.G.P.S.
(intermittent)
C.V. ES2 ES1 ES3 LOS PV2 SHTR
16 17 18 19 20 21 22
gas supply
V1
PV1
L.G.P.S.
EN2R--9023 9705R0--NE
vent--
valve
burner
V2
V2
PV2
LO
HI