Honeywell 7800 Series Installation Instructions Manual page 8

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES
1 120 VAC, 50/60 HZ POWER SUPPLY, RM7850A; 220-240 VAC, 50/60 HZ POWER SUPPLY, EC7850A.
2
EC/RM7850A Power Burner Full Modulation, GAS or OIL Sequence
LED
DISPLAY
INITIATE STANDBY
POWER
PILOT
FLAME
MAIN
ALARM
BURNER
OPERATING
CONTROLS
AND
INTERLOCKS
AFS CHK
FLAME
SIGNAL
MOD
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.
32-00198—01
Q7800
HIGH FIRE
G 12
COMMON
N 13
MODULATE
AL
3 14
LOW FIRE
(L1)
4 15
5 16
FAN
RT 6 17 ES2
7 18
LD2
ES1
PV1 8 19 ES3
9 20
MV LOS
10 21
PV2
IGN
F 22
2
FLAME
DETECTOR
SEE FLAME DETECTOR INSTRUCTIONS FOR CORRECT WIRING.
PURGE
DRIVE
DRIVE
TO HIGH OR PRE
TO LOW
WAITING IGNITION
FIRE
FIRE
BURNER/BLOWER MOTOR
IGNITION
PREIGNITION INTERLOCK
LIMITS AND BURNER CONTROL CLOSED
LOCKOUT INPUT
1 2
10 sec
AIRFLOW SWITCH CHECK
HF Sw
19
SAFE START CHECK
HF
LF
4
3 sec
Fig. 5. Wiring subbase and sequence chart for EC/RM7850A.
SERIES 90
SERIES 90
FIRING RATE
CONTROLLER
MOTOR
B B
R R
W W
1
L1
N
FIRST MAIN
SAFETY TRIAL
PILOT
STABIL.
TIME TIME
5
10
PILOT VALVE
8
V2
21
MAIN VALVE
17
LF Switch
FLAME PROVING
5 6 7 6
3 or 5 sec 5 sec 3 or 5 sec
DUE TO ONE EXTRA SECOND FOR SAFETY RELAY TEST,
5
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.
8
LEGEND
AL ALARM
(NORMALLY OPEN)
LOW FIRE SWITCH
ES1
INPUT
PREIGNITION
ES2
INTERLOCK INPUT
HIGH FIRE SWITCH
ES3
INPUT
BURNER/BLOWER
FAN
MOTOR
IGNITION
IGN
LINE VOLTAGE SUPPLY
L1
LOCKOUT INPUT
LOS
AIRFLOW SWITCH INPUT
LD2
MAIN FUEL VALVE
MV
PILOT VALVE 1
PV1
(INTERRUPTED)
PV2 PILOT VALVE 2
(INTERMITTENT)
RT LIMITS AND BURNER
CONTROL
MAIN
STABIL. RUN POSTPURGE STANDBY
9
6
20
3
AFS CHK
7
18
SAFE START CHECK
MOD
6
5 sec 2, 15 or 30 sec
M23304