Principle Technical Features - Honeywell 7800 Series Manual

1 INCH NPT
15/16 [24] DIA.
1
2
2
[64]
1 [25]
2 [51]
Fig. 5—Infrared Detector.
The RM7885A provides all customary flame safeguard
functions while providing significant advancements in the
areas of safety, annunciation and system diagnostics.
SAFETY SHUTDOWN (LOCKOUT) OCCURS IF:
1. INITIATE Period:
a. AC line power errors occurred, see Operation.
b. Four minute INITIATE period has been exceeded.
2. STANDBY Period:
a. Flame signal is present after 40 seconds.
b. Intermittent pilot valve terminal is energized.
c. Main valve terminal is energized.
d. Internal system fault occurred.
3. SAFE START CHECK:
a. Flame signal is present.
5
2
32
[55]
7
6
32
[158]
19
6
32
[168]
15/16–18 UNC
(2 EACH)
2 LEADS IN A
48 INCH [1.2 METER]
FLEXIBLE CONDUIT
BUSHING WITH
MAGNIFYING LENS
Principal Technical Features
SPECIFICATIONS • PRINCIPLE TECHNICAL FEATURES
13
11 [300]
16
13 27
7 [198] 1
16 32
[47]
C7076D
CELL MOUNT
3
2 [70]
4
1
1
4
[32]
APERTURE
COLLAR, 3/4-14 NPSM
INTERNAL THREADS
C7015
b. Intermittent pilot valve terminal is energized.
c. Main valve terminal is energized.
d. Internal system fault occurred.
4. IGNITION Period:
a. Intermittent pilot valve terminal is not energized.
b. Start Switch is energized longer than 15 minutes.
c. Main valve terminal is energized.
d. Internal system fault occurred.
5. RUN Period:
a. No flame is present.
b. Pilot valve terminal is not energized.
c. Main valve terminal is not energized.
d. Internal system fault occurred.
7
13
5 [147]
16
13
5
16
[147]
M5084
HEAT BLOCK
5
1 [41]
8
1
1 [27]
16
1
1
4
[32]
3/4-14
3/4-14 NPSM
NPSM
INTERNAL
THREADS
M1982A
65-0107
RM7885A