10
FIGURE 2.10: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
INTERMITTENT PILOT, VENT DAMPER &
400 SERIES LWCO
FIGURE 2.11: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
STANDING PILOT, VENT DAMPER & 400 SERIES
PS804 LWCO
BURNER
T'STAT OR
OPER. CNTRL
SPILL AND ROLLOUT SWITCHES
ON 3 THRU 6 SECTION ONLY
DAMPER
5
2
VENT
1
4
SENSOR
PRESSURE
CONTROL
MV/PV
GAS VALVE
IGNITER
ROLLOUT
SWITCH
(TR)
(TH-TR)
SPILL SWITCH
(TH)
PV
MV
BLK
WHT
BLUE
RED
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE BOILER
MUST BE REPLACED, USE A SIMILAR WIRE OF 105
∞
C RATING.
H
DAMPER
VENT
5
2
4
1
115 V AC
115V/24V
(TH-TR)
ROLLOUT
GAS VALVE
MV/PV
SWITCH
(TR)
(TH)
SENSOR
IGNITER
PV
BLK
WHT
RED
MV
WHT
WHT
SPARK
60393 REV.2
24(GND)
24V
MV/PV
GND
PV
S8600
MV
N
PV
SPARK
24V
24(GND)
GND
115V 60HZ
S8600
MV/PV
MV
STEAM BOILERS EQUIPPED WITH VENT DAMPER,
1. MOTOR DRIVES VENT DAMPER TO CLOSED POSITION AND
3. THERMOSTAT (OR OPERATING CONTROL) CALLS FOR HEAT.
5. DAMPER END SWITCH CLOSES (PROVING DAMPER OPEN).
6. IF NO FAILURE EXISTS, THE PILOT VALVE AND IGNITER
8. MAIN VALVE IS ENERGIZED AND IGNITER DE-ENERGIZED.
10. SYSTEM RETURNS TO STANDBY WITH DAMPER CLOSED.
CG-400 SERIES LWCO AND IID
REMAINS CLOSED DURING STANDBY.
2. SENSING CIRCUIT IS CONTINUOUSLY MONITORED.
4. DAMPER BLADE OPENS .
7. PILOT IS IGNITED AND SENSOR SENSES FLAME.
9. UNIT OPERATES UNTIL THERMOSTAT (OR OPERATING
CONTROL) IS SATISFIED.
FIELD WIRING
FACTORY WIRING
LOW WATER
CUTOFF
ARE ENERGIZED.
CONTROL
SWITCH
SPILL
BLUE
BLK
PRESSURE
THERMOSTAT
OR OPER.
CONTROL
OPERATING SEQUENCE
115/24V
TRANSF.
LWCO
(H)
1
(B)
P2
(N)
2
P2
(B)
(N)
2
P1
(H)
1
A
BUR
NER
BLK
BURNER
8. UNIT OPERATES UNTIL THERMOSTAT (OR OPERATING
9. SYSTEM RETURNS TO STANDBY WITH DAMPER CLOSED.
6. DAMPER END SWITCH CLOSES (PROVING DAMPER OPEN).
4. THERMOSTAT (OR OPERATING CONTROL) CALLS FOR HEAT.
1. MOTOR DRIVES VENT DAMPER TO CLOSED POSITION AND
115V/24V
MUST BE REPLACED, USE A SIMILAR WIRE OF 105
∞
C RATING.
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE BOILER
OPER. CNTRL
T'STAT OR
BLUE
4
SWITCH
ROLLOUT
DAMPER
2
5
SPILL SWITCH
LWCO
VENT
(H)
1
1
(B)
(N)
P2
H
2
GAS VALVE
CONTROL
PRESSURE
115 V AC
VENT
DAMPER
BLUE
5
4
2
1
WHT
RED
BLK
SWITCH
ROLLOUT
GAS VALVE
(TH)
(TR)
BLK
WHT
PRESSURE
SPILL
SWITCH
CONTROL) IS SATISFIED.
CUTOFF
LOW WATER
(B)
FACTORY WIRING
FIELD WIRING
1
(H)
(N)
2
NER
BUR
A
P2
7. MAIN VALVE IS ENERGIZED.
THERMOSTAT
CONTROL
CONTROL
OR OPER.
5. DAMPER BLADE OPENS .
3. SENSING CIRCUIT IS CONTINUOUSLY MONITORED.
REMAINS CLOSED DURING STANDBY.
60392 REV.2
N
115V 60HZ
TRANSF.
115/24V
RED
WHT
EQUIPPED WITH STANDING PILOT, VENT DAMPER
OPERATING SEQUENCE FOR SREAM BOILERS
HI-LIMIT & CG-400 SERIES LWCO
2. STANDING PILOT REMAINS LIT.
P1
NATURAL GAS 3 THRU 7 SECTION.
LP GAS 3 THRU 9 SECTION.
SPILL & ROLLOUT SWITCHES ON 3 THRU 6 SECTION ONLY.
Summary of Contents for VSB2-605
Page 23: ...23 NOTES...
