6
EC7830, RM7830A,EC7850A,RM7850A 7800 SERIES RELAY MODULES
66-1092—2
Fig. 4. Wiring subbase and sequence chart for EC/RM7850A.
L1
N
1
G
12
N
13
3
14
4
15
5
16
6
17
7
18
8
19
(L1)
9
20
10
21
F
22
AL
FAN
RT
LD2
PV1
MV
IGN
B
R
W
B
R
W
HIGH FIRE
COMMON
MODULATE
LOW FIRE
ES2
ES1
ES3
LOS
PV2
FLAME
DETECTOR
1
120 VAC, 50/60 HZ POWER SUPPLY, RM7850A; 220-240 VAC, 50/60 HZ POWER SUPPLY, EC7850A.
SEE FLAME DETECTOR INSTRUCTIONS FOR CORRECT WIRING.
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
AL
ES1
ES2
ES3
FAN
IGN
L1
LOS
LD2
MV
PV1
SERIES 90
FIRING RATE
MOTOR
Q7800
SERIES 90
CONTROLLER
2
2
INITIATE
POWER
PILOT
FLAME
MAIN
ALARM
STANDBY
RUN
STANDBY
PURGE
OR
WAITING
PRE
IGNITION
PILOT
STABIL.
MAIN
STABIL.
IGNITION
BURNER
POSTPURGE
MAIN VALVE
LIMITS AND BURNER CONTROL CLOSED
LOCKOUT INPUT
10 sec
AIRFLOW SWITCH CHECK
PILOT VALVE
V2
PREIGNITION INTERLOCK
OPTIONS
SAFE START CHECK
FLAME PROVING
3 sec
5 sec
5 sec
1
IF ON AT CALL FOR HEAT, HOLD (120 SEC). LOCK OUT IF STILL ON.
IF OFF AFTER 10 SEC OF FAN, LOCK OUT.
TAKE LOCKOUT ACTION. CONTINUE POSTPURGE TIMING.
SELECT VIA ST7800A PURGE TIMER CARD.
3 or 5 sec
3 or 5 sec
,
SAFE START CHECK
2
MOD
HF
LF
LF
HF
MOD
MOTOR
HF Sw
LF Switch
2, 15 or 30 sec
3
4
5
4
5
6
DUE TO ONE EXTRA SECOND FOR SAFETY RELAY TEST,
TIMING CAN VARY FROM 3 TO 4 SEC.
SELECTION VIA CONFIGURATION JUMPERS OR MODEL NUMBERS.
AFS CHK
1
2 sec
AFS CHK
AFS CHK
6
LED
DISPLAY
DRIVE
TO HIGH
FIRE
DRIVE
TO LOW
FIRE
FIRST
SAFETY
TIME
MAIN
TRIAL
TIME
OPERATING
CONTROLS
AND
INTERLOCKS
FLAME
SIGNAL
EC/RM7850A Power Burner Full Modulation, GAS or OIL Sequence
2
3
6
6
M15186B
10
BURNER/BLOWER MOTOR
5
8
21
9
6
20
7
18
19
21
RT
PV2