Principal Technical Features - Honeywell 7800 Series Manual

RM7888A
SPECIFICATIONS • PRINCIPAL TECHNICAL FEATURES
Fig. 6—Ultraviolet detectors (Continued).
15/16 [24]
DIAMETER
1
2
2
[64]
1 [25]
2 [51]
Sequence timing for RM7888A Relay Module operation are listed in Table 3.
RM7888A
Sequence
Pilot: PV Return
Pilot: MV Lo Fire
DSI Normal
DSI High/Low
Stepfire
DSI On/Off Stepfire 10 seconds
* STANDBY and RUN can be an infinite time period.
** PURGE will be determined by the system master controller.
The RM7888A provides customary flame safeguard func-
tions while providing significant advancements in the areas
of safety, annunciation and system diagnostics.
SAFETY SHUTDOWN (LOCKOUT) OCCURS IF:
1. INITIATE Period
a. Configuration jumper was changed (after 200 hours).
b. AC line power errors, see Operation section.
c. Four minute INITIATE period is exceeded.
2. STANDBY Period
a. Flame signal is present after 40 seconds.
b. Pilot valve/1st stage main valve terminal is energized.
c. Main valve terminal is energized.
d. Internal system fault.
e. Flame detected during the last two seconds.
f. Limits Complete is not energized after 120 seconds.
65-0175
5
1 INCH NPT
2
32
[55]
7
6
32
[158]
19
6
32
[168]
15/16–18 UNC
(2 EACH)
TABLE 3—SEQUENCE TIMING FOR OPERATION.
Initiate Standby
10 seconds *
10 seconds *
10 seconds *
10 seconds *
*
13
11 [300]
16
13
7 [198]
16
C7076D
Pilot Flame
Establishing
Purge Period (PFEP)
** 10 seconds
** 10 seconds
** 4 seconds
** 4 seconds
** 4 seconds

Principal Technical Features

g. Hold @Low Fire Switch is not energized after eight
minutes of hold.
h. Flame Proven terminal energized.
i. Ignition terminal energized.
j. Configuration jumpers select is illegal (during last
two seconds).
3. PILOT FLAME ESTABLISHING Period (PFEP) (Pilot
Configuration)
a. Pilot/1st stage main valve terminal is not energized.
b. No flame is present at end of PFEP.
c. Internal system fault.
d. Main valve terminal is energized.
e. Limits Complete is not energized.
f. @Low Fire is not energized.
g. Ignition terminal is not energized for the first ten sec-
onds of PFEP.
8
27 13
1 5 [147]
32 16
[47]
13
5
16
[147]
Main Flame
Establishing Pilot
Period (MFEP) Relight
15 seconds 5 sec to infinity
15 seconds —
— —
— —
— —
M5084A
Run
*
*
*
*
*