Wiring - Honeywell 7800 Series Manual

Refer to Fig. 7 for proper subbase wiring. Figures 8, 9, 10
and 11 show optional connections for the RM7885A.
Fig. 8 shows the use of a high-low or modulating motor
with the RM7885A. Note that the starting circuit cannot be
energized until the end switch of the high-low or modulating
motor is in the low fire position. Also to prevent the high-low
Fig. 7—RM7885 wiring.
S445A
START-STOP
STATION
INTERNAL
JUMPER
FOR DIRECT SPARK IGNITION (OIL
OR GAS)
8
MAIN VALVE
9
120V, 60 Hz POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
2
120V ALARM
STOP
B A
D C
START
IGNITION
RECTIFYING FLAME
ROD, RECTIFYING
PHOTOCELL, OR INFRA-
RED (LEAD SULFIDE)
FLAME DETECTOR
C7027A, C7035A, OR
WHITE
C7044A ULTRAVIOLET
FLAME DETECTOR
C7012A,C,E,F OR
YELLOW
C7076A ULTRAVIOLET
FLAME DETECTOR
L
2
or modulating motor from running in the high fire position
before the manually opened safety-shutoff valve is opened, a
fuel pressure switch (connected downstream from the shut-
off valve) is connected in series with the R482B Relay. This
assures that the burner will lightoff in the low fire position
before the controller can take command of the burner.
Q7800
G
L
2
DPST ALARM
(L1
3
SILENCING
)
SWITCH
4
5
6
LIMITS
7
INTERMITTENT
8
PILOT
MAIN FUEL
9
VALVE(S)
1
0
F
OR
BLUE
OR
BLUE
WHITE
WHITE
L2
BLACK
L1
BLACK
L2
11
RM7885A

Wiring

1
2
1
3
1
4
1
5
1
6
1
7
2
1
8
1
9
2
0
2
1
2
2
L1
(HOT)
L2
MASTER
1
SWITCH
M5154A
65-0107
WIRING