Yamatake-Honeywell 7800 Series Manual page 6

7800 SERIES EC7890A,B/RM7890A,B RELAY MODULE
POWER
PILOT
FLAME
MAIN
ALARM
RESET
5 (127)
Fig. 2. Mounting dimensions of 7890 Relay Module and Q7800B Subbase in in. (mm).
IGNITION
ELECTRODE FLAME ROD
(Q179C ONLY)
1-21/32
(42)
3-1/8
(79)
25/32 25/32
(20) (20)
2-25/32
(62)
BRACKET
2
(51)
1-1/4 (32)
C7013A
65-0204–1
BURNER
CONTROL
5
(127)
REMOVE ONLY FOR TERMINAL TEST ACCESS.
1
CERAMIC
INSULATORS
1 (25)
1-13/32
(36)
TARGET
3/8 (10)
1-1/16
1/2 (13)
(27)
3/32 (2)
11/16
(18)
17/32
THREADED
(14)
MOUNTING
HOLES (2)–
10-32 UNF
M1983
Q179
5/16
1-5/16 (33)
(8)
Fig. 3. Rectification detectors.
6-3/32 (155)
MOUNTING FLANGE
7-7/32
(183)
3-3/4
(95)
1/2–14 NPSM
LEADWIRES
C7012A,C,E,F
1-1/4 (32)
13/16 (21)
1-3/4
(45)
C7014A
6
1
M11134
3/4–14 NPT
5-1/8 (130)
3-7/16
(87)
5-1/4 (133)
FACEPLATE
M1962A
1-3/8 (35)
M1847