Honeywell R7795A - Page 7

7 66-2001—2
R7795A,B,C,D
DETAILED OPERATING SEQUENCE
Fig. 5—Internal schematic of the R7795C,D with interrupted pilot.
INTERRUPTED
PILOT VALVE
DELAYED
MAIN VALVE
MAIN
FUEL VALVE
BURNER
MOTOR
IGNITION
TRANSFORMER
OPTO
ISOLATOR
BASIC DIAGRAM OF
THE R7795C
LINE VOLTAGE
ALARM
1
1
1
2
2
2
3
3
3
5
7
6
18
L1
L2
F
G
8
16
9
3
M11914
2K 4K
ST795A
RUN TEST
SWITCH
120 Vac
60 HZ
L1
(HOT)
L2
LINE VOLTAGE
AIRFLOW SWITCH
CONTROLLER
LIMIT(S)
FLAME AMPLIFIER
SOLID STATE
LOGIC CKT.
3K3
3K1
1K2
F1
S.SW
S.SW
3K
4K1
4K2
2K1
2K1
INTERRUPTED
PILOT VALVE
DELAYED
MAIN VALVE
MAIN
FUEL VALVE
BURNER
MOTOR
IGNITION
TRANSFORMER
FLAME
DETECTOR
FLAME
DETECTOR
BASIC DIAGRAM OF
THE R7795D
LINE VOLTAGE
ALARM
5
7
6
18
L1
L2
F
G
G
8
16
9
3
2K 4K
ST795A
RUN TEST
SWITCH
120 Vac
60 HZ
L1
(HOT)
L2
LINE VOLTAGE
AIRFLOW SWITCH
CONTROLLER
LIMIT(S)
FLAME AMPLIFIER
SOLID STATE
LOGIC CKT.
3K3
3K1
1K2
F1
S.SW
S.SW
3K
4K1
4K2
2K1
2K1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
SELECT APPROPRIATE FLAME DETECTOR.
CONNECT TERMINAL TO EARTH GROUND.
1K
1K