Honeywell 7800 SERIES Instruction Manual page 7

AL
FAN
RT
LD2
PV1
MV
IGN
2
FLAME
DETECTOR
1 120 VAC, 50/60 HZ POWER SUPPLY, RM7850A; 220-240 VAC, 50/60 HZ POWER SUPPLY, EC7850A.
2 SEE FLAME DETECTOR INSTRUCTIONS FOR CORRECT WIRING.
EC/RM7850A Power Burner Full Modulation, GAS or OIL Sequence
LED DRIVE
DISPLAY
TO HIGH
INITIATE STANDBY
FIRE
POWER
PILOT
FLAME
MAIN
ALARM
BURNER
OPERATING
PREIGNITION INTERLOCK
CONTROLS
AND
INTERLOCKS
LOCKOUT INPUT
1
10 sec
AFS CHK
FLAME
SAFE START CHECK
SIGNAL
MOD
HF
HF
LF
MOTOR
2 sec AFS CHK
OPTIONS
1 IF ON AT CALL FOR HEAT, HOLD (120 SEC). LOCK OUT IF STILL ON.
2
IF OFF AFTER 10 SEC OF FAN, LOCK OUT.
3
TAKE LOCKOUT ACTION. CONTINUE POSTPURGE TIMING.
4
SELECT VIA ST7800A PURGE TIMER CARD.
EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES
SERIES 90
FIRING RATE
Q7800 MOTOR
HIGH FIRE
G 12
COMMON
N 13
MODULATE
3 14
LOW FIRE
4 (L1) 15
5 16
6 17
ES2
7 18
ES1
8 19 ES3
9 20
LOS
10 21
PV2
F 22
PURGE
FIRST
DRIVE
OR PRE
SAFETY
TO LOW
WAITING IGNITION
TIME
FIRE
BURNER/BLOWER MOTOR
IGNITION
10
PILOT VALVE
V2
17
LIMITS AND BURNER CONTROL CLOSED
2
AIRFLOW SWITCH CHECK
HF Sw LF Switch
19
LF
4 5 6
3 sec 3 or 5 sec
7
SERIES 90
AL
CONTROLLER
ES1
B B
ES2
R R
ES3
W W
FAN
IGN
L1
LOS
LD2
MV
PV1
PV2
RT
1
L1
N
MAIN
MAIN
PILOT TRIAL
STABIL. STABIL.
TIME
5
8
21
MAIN VALVE
18
FLAME PROVING
7 6
5 sec 3 or 5 sec 5 sec
5 DUE TO ONE EXTRA SECOND FOR SAFETY RELAY TEST,
TIMING CAN VARY FROM 3 TO 4 SEC.
6 SELECTION VIA CONFIGURATION JUMPERS OR MODEL NUMBERS.
EC7850A1148/RM7850A1035 IS 3 OR 2 SELECTED VIA
7
CONFIGURATION JUMPER.
LEGEND
ALARM
(NORMALLY OPEN)
LOW FIRE SWITCH
INPUT
PREIGNITION
INTERLOCK INPUT
HIGH FIRE SWITCH
INPUT
BURNER/BLOWER
MOTOR
IGNITION
LINE VOLTAGE SUPPLY
LOCKOUT INPUT
AIRFLOW SWITCH INPUT
MAIN FUEL VALVE
PILOT VALVE 1
(INTERRUPTED)
PILOT VALVE 2
(INTERMITTENT)
LIMITS AND BURNER
CONTROL
RUN
POSTPURGE STANDBY
9
6
20
3
AFS CHK
7
SAFE START CHECK
MOD
6
2, 15 or 30 sec
M23304
66-1092—06