Honeywell R7795A Manual page 5

Fig. 3—Internal schematic of the R7795A,B with intermittent pilot.
BASIC DIAGRAM OF
THE R7795A
BURNER
MOTOR
LINE VOLTAGE
ALARM
LINE VOLTAGE
AIRFLOW SWITCH
CONTROLLER
LIMIT(S)
BASIC DIAGRAM OF
THE R7795B
BURNER
MOTOR
LINE VOLTAGE
ALARM
LINE VOLTAGE
AIRFLOW SWITCH
CONTROLLER
LIMIT(S)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 SELECT APPROPRIATE FLAME DETECTOR.
3K3
1K2
8
3K1 S.SW
16
S.SW
9
OPTO
3
ISOLATOR
1K
ST795A
3K3
1K2
8
3K1 S.SW
16
S.SW
9
3
1K
ST795A
3
CONNECT
5
DETAILED OPERATING SEQUENCE
7
2K1
6
2K1
F1
18
3K
L1
L2
F
FLAME AMPLIFIER
SOLID STATE
LOGIC CKT.
G
3
2K
7
2K1
6
2K1
F1
18
3K
L1
L2
F
FLAME AMPLIFIER
SOLID STATE
LOGIC CKT.
G
3
2K
G
TERMINAL TO EARTH GROUND.
R7795A,B,C,D
INTERRUPTED
5
PILOT VALVE
MAIN
FUEL VALVE
IGNITION
TRANSFORMER
2
FLAME
DETECTOR
1
L1
120 Vac
(HOT)
60 HZ
L2
INTERRUPTED
5
PILOT VALVE
MAIN
FUEL VALVE
IGNITION
TRANSFORMER
2
FLAME
DETECTOR
1
L1
120 Vac
(HOT)
60 HZ
L2
M11915
66-2001—2