Honeywell 7800 SERIES User manual

CONTENTS
Specifications ................................................2
Ordering Information.................................... 2
Principle Technical Features ........................ 7
Safety Provisions ........................................... 8
Installation .................................................... 9
Wiring.......................................................... 11
Assembly...................................................... 16
Operation .................................................... 19
Checkout...................................................... 21
Troubleshooting .......................................... 29
L.Z. • 6-92 • © Honeywell Inc. 1992 • Form Number 65-0107
■Safety features:
— Closed loop logic test.
— Dynamic AMPLI-CHECK™.
— Dynamic input check.
— Dynamic safety relay test.
— Dynamic self-check logic.
— Expanded safe-start check.
— Internal hardware status monitoring.
— Tamper resistant timing and logic.
■Lockout if Start Switch is held 15 minutes.
■Access for external electrical voltage checks.
■Application flexibility.
■Communication interface capability.
■Dependable,long-termoperationprovidedbymicrocom-
puter technology.
■First-out annunciation and system diagnostics are pro-
vided by an optional 2 row by 20 column Vacuum
Fluorescent Display (VFD) located on the optional Key-
board Display Module.
■First-out expanded annunciation with 26 Light Emitting
Diodes (LEDs) for limits and interlocks (optional).
■Five LEDs for sequence information.
■Interchangeable plug-in flame amplifiers.
■LocalorremoteannunciationofRM7885Aoperationand
fault information (optional).
■Nonvolatilememory;RM7885Aretainshistoryfilesand
sequencing status after loss of power.
■Remote reset (optional).
■Report generation (optional).
■Shutter drive output
■Burner controller data (optional):
— Expanded annunciator status.
— Flame signal strength.
— Hold status.
— Lockout/alarm status.
— Sequence status.
— Sequence time.
— Total hours of operation.
— Total cycles of operation.
— Fault history providing the six most recent faults:
• Cycles of operation at the time of the fault.
• Expanded annunciator data at the time of the
fault.
• Fault message and code.
• Hours of operation at the time of the fault.
• Sequence status at the time of the fault.
• Sequence time at the time of the fault.
— Diagnostic information:
• Device type.
• Flame amplifier type.
• Flame failure response time.
• Manufacturing code.
• On/off status of all digital inputs and outputs.
• Software revision and release of RM7885A and
optional Keyboard Display Module.
The Honeywell RM7885 is a microprocessor based inte-
grated burner control for semi-automatically fired gas, oil or
combination fuel single burner industrial applications. The
RM7885 requires a Relay Module Subbase and Amplifier to
complete the system. Options include Keyboard Display Mod-
ule, Personal Computer Interface, DATA CONTROLBUS
MODULE™, Remote Display Module, First-Out Expanded
AnnunciatorandCOMBUSTIONSYSTEMMANAGER™Soft-
ware.
The RM7885 is programmed to provide a level of safety,
functional capability and features beyond the capacity of con-
ventional controls.
The RM7885 is adaptable to continuous firing, high-low or
modulating firing rate for semi-automatic burner sequencing.
Functions provided by the RM7885 include flame supervision,
systemstatusindication,systemorself-diagnosticsandtrouble-
shooting.
The RM7885 will operate with any of the following types of
ignitions:
1. Torch-ignited main burner using the S445A Start-Stop
Station, or any conventional knee or foot operated start-stop
station.
2. Torch-ignitedpilotusingtheS445AStart-StopStation,or
any conventional knee or foot operated start-stop station.
3. Direct-ignition oil burner or electrically ignited pilot,
using the S445A Start-Stop Station, which maintains electric
ignition as long as the Start Switch is depressed (up to 15
minutes).
7800 SERIES
RM7885A
Relay Module

2
RM7885A
SPECIFICATIONS • ORDERING INFORMATION
Specifications
When purchasing replacement and modernization products from your 7800 SERIES distributor, refer to the TRADELINE® Catalog for complete
ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Satisfaction
Honeywell Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386 [phone]
In Canada—Honeywell Limited/Honeywell Limitee, 740 Ellesmere Road, Scarborough, Ontario M1P 2V9 International Sales and Service Offices
inallprincipalcitiesoftheworld.ManufacturinginAustralia,Canada,Finland,France,Germany,Japan,Mexico,Netherlands,Spain,Taiwan,United
Kingdom, U.S.A.
Ordering Information
ELECTRICAL RATINGS, see Table 1:
Voltage and Frequency:
120 Vac (+10/-15%), 50 or 60 Hz (+/- 10%).2
Power Dissipation: RM7885A: 10W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing: Total Connected Load: 20A maximum, type
FRN or equivalent.
TABLE 1—TERMINAL RATINGS.
Terminal No. Description Ratings
G Flame Sensor Ground
Earth G Earth Ground.1
L2(N) Line Voltage Common
3 Line Voltage Supply (L1) 120 Vac (+10/-15%), 50 or 60 Hz (+/- 10%).2,3,4
4 Alarm 120 Vac, 1A pilot duty.
5 Unused
6 Stop Station 120 Vac, 9A.
7 Unused
8 Pilot Valve 120 Vac, 4.5A ignition and 50VA pilot duty.4
9 Main Fuel Valve 120 Vac, 2A pilot duty.5
10 Start Input 120 Vac, 1 mA
F(11) Flame Sensor 60 to 220 Vac, current limited.
12 Unused
13 Unused
14 Unused
15 Unused
16 Unused
17 Unused
18 Unused
19 Unused
20 Unused
21 Unused
22 Shutter 120 Vac, 0.5A
1The RM7885A must have an earth ground providing a connection between the subbase and the control panel or the
equipment. The earth ground wire must be capable of conducting the current to blow the 20A fuse (or breaker) in event
ofaninternalshortcircuit.TheRM7885Aneedsalowimpedancegroundconnectiontotheequipmentframethat,inturn,
needs a low impedance connection to earth ground. For a ground path to be low impedance at RF frequencies, the
connection must be made with minimum length conductors having maximum surface areas. Wide straps or brackets
rather than leadwires are preferred. Be careful to verify that mechanically tightened joints along the ground path, such
as pipe or conduit threads or surfaces held together with fasteners, are free of nonconductive coatings and are protected
against mating surface corrosion.
2Operating frequency chosen by RM7885A selection.
32000 VA maximum connected load to RM7885A Assembly.
4Can also be 120 Vac, 1A pilot duty.
5Can also be 65 VA pilot duty with motorized valve, 1150 VA inrush, 460 VA open, 250 VA hold.

RM7885A
SPECIFICATIONS
3 65-0107
TABLE 2—FLAME DETECTION SYSTEMS .
Plug-in Flame Signal Amplifiers Applicable Flame Detectors
Flame
Failure
Self- Response
Type Color Checking Model Time Fuel Type Models
Rectification Green No R7847A .8 or 3 sec Gas Rectifying C7004,
Flame Rod C7007,
HoldersdC7011.
Complete Assemblies:
C7008, C7009, Q179.
No R7847A .8 or 3 sec Oil Rectifying C7003, C7010,
PhotocelleC7013, C7014.
No R7847A 3 sec Gas, oil, Ultraviolet C7012A,C.a
coal (PurplePeeper)
Dynamic R7847Bc.8 or 3 sec Gas Rectifying C7004, C7007,
AMPLI- Flame Rod C7011.
CHECK™ HoldersdComplete Assemblies:
C7008, C7009, Q179.
Dynamic R7847Bc.8 or 3 sec Oil Rectifying C7003, C7010,
AMPLI- Photocell C7013, C7014.
CHECK™
Dynamic R7847Bc3 sec Gas, oil, Ultraviolet C7012A,C.a
AMPLI- coal (Purple
CHECK™ Peeper)
Dynamic R7847Cb3 sec Gas, oil, Ultraviolet C7012E,F.
Self- coal (Purple
Check Peeper)
Infrared Red No R7848A 3 sec Gas, oil, Infrared C7015.
coal (Lead Sulfide)
Dynamic R7848Bc3 sec Gas, oil Infrared C7015.
AMPLI- coal (Lead Sulfide)
CHECK™
Ultraviolet Purple No R7849A .8 or 3 sec Gas, oil Ultraviolet C7027, C7035,
(Minipeeper) C7044.a
Dynamic R7849Bc.8 or 3 sec Gas, oil Ultrviolet C7027, C7035,
AMPLI- (Minipeeper) C7044.a
CHECK™
Blue Dynamic R7886Ab3 sec Gas, oil, Ultraviolet C7076.
Self- coal (Adjustable
Check Sensitivity)
aThe C7012A,C, C7027, C7035 and C7044 Flame Detectors should be used only on burners that cycle on-off at least
once every twenty-four hours. Appliances with burners that remain on continuously for twenty-four hours or longer
should use the C7012E,F Flame Detector with the R7847C Amplifier or the C7076A,D Flame Detector with the
R7886A Amplifier as the ultraviolet flame detection system.
bCircuitry tests all electronic components in the flame detection system (amplifier and detector) 12 times a minute
during burner operation and shuts down the burner if the detection system fails.
cCircuitry tests the flame signal amplifier at least 12 times a minute during burner operation and shuts down the
burner if the amplifier fails.
dOrder flame rod separately; see holder Instructions.
eUse only Honeywell Photocell, part no. 38316, ONLY.
WEIGHT:RM7885AwithDustCover:1pound13ounces,
unpacked.
IMPORTANT: Flame Detection System available for
use with RM7885A. To select your Plug-in Flame
Signal Amplifier and applicable Flame Detector, see
Table 2 and Figs. 3-5.
ENVIRONMENTAL RATINGS:
Ambient Temperature:
Operating: -40°F to 140°F.
Storage: -60°F to 150°F.
Humidity: 85% RH continuous, noncondensing.
Vibration: 0.5G environment.
DIMENSIONS: Refer to Figs. 1 and 2.

RM7885A
SPECIFICATIONS
4
SEQUENCE TIMING FOR NORMAL OPERATION
Device Initiate Standby Ignition Run
RM7885A 10 sec. * ** *
*STANDBY and RUN can be an infinite time period.
**IGNITION is the time the Start Switch is pushed and limited to 15 minutes.
Fig. 1—Mounting dimensions of RM7885A Relay Module and Q7800A. Subbase in inches [millimeters].
POWER
PILOT
FLAME
MAIN
ALARM
RESET
5
[127]
5 [127]
M5148
5 [133]
1
4
BURNER CONTROL
REMOVE ONLY FOR TERMINAL TEST ACCESS.
1
1
APPROVAL BODIES:
Underwriters Laboratories Inc. listed, File No. MP268,
Guide No. MCCZ.
Canadian Standards Association certified, LR9S329-3.
Factory Mutual approved.
IRI acceptable.
Federal Communications Commission, Part 15, Class B-
Emissions.
MOUNTING:Q7800Aforpanel mountorQ7800Bforwall
or burner mount.
REQUIRED COMPONENTS:
Plug-in Flame Signal Amplifier, see Table 2.
Wiring Subbase Q7800A1005 (panel mounted) or
Q7800B1003 (wall mounted).
ACCESSORIES:
Optional:
ControlBus 5-Wire Electrical Connector—part no.
203541.
COMBUSTIONSYSTEMMANAGER™—partno.
ZM7850A1001.
Communication Interface Base Unit—part no.
Q7700A1014.
Communication Interface ControlBus Module—part
no. QS7800A1001.
Keyboard Display Module—part no. S7800A1001.
DATA CONTROLBUS MODULE™—part no.
S7810A1009.
Remote Reset Module—part no. S7820A1007.
Expanded Annunciator—part no. S7830A1005
Flame Simulators:
— part no. 203659 UV Flame Simulator.
— part no. 123514A Rectification Simulator.
RemoteDisplayMountingBracket—partno.203765.
Remote Display Power Supply
— part no. 203968A Plug-in.
— part no. 203969A Screw Terminal.
Tester—part no. A7800A1002.
Replacement Parts:
Dust Cover - part no. 221729.
Electrical Access Slot Covers - part no. 221779
(Q7800B only)

RM7885A
SPECIFICATIONS
5 65-0107
Fig. 2—Mounting dimensions of RM7885A Relay Module and Q7800B Subbase in inches [millimeters].
MOUNTING FLANGE
7 [183]
7
32
3
[87]
7
16
3
[95]
3
4
5
[130]
1
8
5 [133]
1
4
1/2–14 NPSM
LEADWIRES FACEPLATE
3/4–14 NPT OR
1–11-1/2 NPT
M1962
THREADED
MOUNTING
HOLES (2)–
10-32 UNF
[13]
1
2
1 [25]
FLAME ROD
[18]
11
16
3
8[10]
[2]
3
32
[20]
25
32 [20]
25
32 [14]
17
32
TARGET
2 [62]
25
32
1
[27]
1
16
1
[36]
13
32
1
[42]
21
32
3
[79]
1
8
CERAMIC
INSULATORS
IGNITION
ELECTRODE
(Q179C ONLY)
BRACKET M1983
1 [32]
1
4
1
[45]
3
4
[21]
13
16 1 [35]
3
8
1 [33]
5
16 5
16 [8]1 [32]
1
4
2
[51]
C7013A C7014A M1847
Q179 C7012A,C,E,F
Fig. 3—Rectification detectors.
POWER
PILOT
FLAME
MAIN
ALARM
RESET
5
[127]
5 [127]
M5149
6 [155]
3
32
BURNER CONTROL
REMOVE ONLY FOR TERMINAL TEST ACCESS.
1
1

RM7885A
SPECIFICATIONS
Fig. 4—Ultraviolet detectors.
6
1
[27]
1
16
COLLAR WITH 1/2-14 NPSM
INTERNAL THREADS
4 [102]
3 [89]
1
2
6 FOOT [1.83 METER]
LEADWIRES (2)
M1943A
MODEL AVAILABLE WITH 24 FOOT [7.32 METER] LEADWIRES.
MODELS AVAILABLE WITH SPUD CONNECTOR (1/2-14 NPSM INTERNAL
THREADS
)
INSTEAD OF CLAMP TYPE CONNECTOR.
1
2
1
2
1
[38]
1
231
32
[25]
1/2-14 NPSM
INTERNAL THREADS
4 [105]
1
8
2
1
[30]
3
16
2 [51]
COLLAR WITH
1–11-1/2 NPSM
INTERNAL
THREADS 1
1DIN APPROVED C7035A1064 HAS 1-11 BSP.P1 INTERNAL THREADS.
DIN APPROVED C7035A1064 HAS 1/2-14 BSP-F INTERNAL THREADS.
MODEL AVAILABLE WITH 12 FOOT [3.66 METER] LEADWIRES.
2 [67]
5
8
2
3
INSERTION DEPTH
6 FOOT
[1.83 METER]
LEADWIRES (2) 3
M1945A
C7035
[22]
7
8
3 [92]
5
8
1
2[13]
9
16 [14]
1 [36]
27
64
[10]
3
8
MOUNTING BRACKET
6 FOOT [1.83 METER]
LEADWIRES (2)
M1944A
C7044
C7027
4 [123]
4
[102]
27
32
1 [27]
1
16
2 [57]
1
4
4 [102]
2
[57]
1
4
10 [261]
9
32
2
[58]
5
16 7 [188]
13
32
7 [194]
2 [68]
11
16 5
8
1
[41]
19
32
[19]
3
4
[23]
29
32
3/8 INCH NPT
1 INCH NPT
7/8 [22] OPENING
FOR 1/2-INCH CONDUIT
ALLOW 9 INCHES [228 MM] CLEARANCE TO
SWING OUT THE DETECTOR FOR LENS
CLEANING OR SERVICING.
1
M5083
C7076A

C7076D
RM7885A
SPECIFICATIONS • PRINCIPLE TECHNICAL FEATURES
7 65-0107
7 [198]
13
16
2
[64]
1
2
15/16 [24] DIA.
6
[158]
7
32
6
[168]
19
32
2 [51]
1 [25]
1 INCH NPT
15/16–18 UNC
(2 EACH)
2
[55]
5
32 1
[47]
27
32
11 [300]
13
16
5 [147]
13
16
5
[147]
13
16
M5084
Fig. 5—Infrared Detector.
1
[32]
1
4
2 [70]
3
4
APERTURE
BUSHING WITH
MAGNIFYING LENS COLLAR, 3/4-14 NPSM
INTERNAL THREADS
3/4-14
NPSM 3/4-14 NPSM
INTERNAL
THREADS
1
[32]
1
4
1 [27]
1
16
1 [41]
5
8
HEAT BLOCKCELL MOUNT
M1982A
2 LEADS IN A
48 INCH [1.2 METER]
FLEXIBLE CONDUIT
C7015
b. Intermittent pilot valve terminal is energized.
c. Main valve terminal is energized.
d. Internal system fault occurred.
4. IGNITION Period:
a. Intermittentpilotvalveterminalisnotenergized.
b. StartSwitchisenergizedlongerthan15minutes.
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.
Principal Technical Features
TheRM7885Aprovidesallcustomaryflamesafeguard
functionswhileprovidingsignificantadvancementsinthe
areas of safety, annunciation and system diagnostics.
SAFETY SHUTDOWN (LOCKOUT) OCCURS IF:
1. INITIATE Period:
a. AC line power errors occurred, see Operation.
b. FourminuteINITIATEperiodhasbeenexceeded.
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.

RM7885A
SAFETY PROVISIONS
8
Safety Provisions
INTERNAL HARDWARE STATUS MONITORING
The RM7885A analyzes the integrity of the internal
hardware. The POWER LED will blink every four seconds
to signify an internal hardware check.
CLOSED LOOP LOGIC TEST
The test verifies the integrity of all safety critical loads,
terminals8and9.Iftheloadsarenotenergizedproperly;i.e.,
the main valve terminal is powered during STANDBY, the
RM7885Awill lockout on safety shutdown. The RM7885A
must react to input changes but avoid the occurrence of
nuisance shutdown events. Signal conditioning is applied to
line voltage inputs to verify proper operation in the presence
of normal electrical line noise such as transient high voltage
spikesorshortperiodsoflinedropout.Signalconditioningis
tolerantofsynchronous noise (line noise events that occur at
the same time during each line cycle).
DYNAMIC AMPLI-CHECK™
Dynamic AMPLI-CHECK™ circuitry tests the flame
signal amplifier during burner operation and shuts down the
RM7885A if the flame amplifier fails.
DYNAMIC FLAME AMPLIFIER AND SHUTTER
CHECK
Self-checking circuitry tests all electronic components in
theflamedetectionsystemandamplifier12timesperminute
and shuts down the RM7885A if the detection system fails.
DYNAMIC INPUT CHECK
All system input circuits are examined to assure that the
RM7885A is capable of recognizing the true status of exter-
nal controls, limits and interlocks. If any input fails this test,
a safety shutdown occurs and the fault will be annunciated.
DYNAMIC SAFETY RELAY TEST
Checks the ability of the dynamic safety relay contact to
open and close. Verifies that the safety critical loads, termi-
nals 8 and 9, can be de-energized, as required, by the
Dynamic Self-Check Logic.
DYNAMIC SELF-CHECK SAFETY CIRCUIT
The microcomputer tests itself and related hardware. If a
microcomputer or related hardware failure occurs and does
not allow proper execution of the self-check routine, safety
shutdown occurs and all safety critical loads will be de-
energized.
EXPANDED SAFE-START CHECK
Theconventionalsafe-startcheck,whichpreventsburner
start-upifflameisindicatedatstart-up,isexpandedtoinclude
a flame signal check during STANDBY and a safety critical
load check.
OFF CYCLE (STANDBY) FLAME SIGNAL CHECK
Theflamedetectionsubsystem(flamedetectorandampli-
fier) is monitored during STANDBY. If a flame simulating
conditionor an actual flame exists, asystemhold occurs and
start-up is prevented. If the flame signal exists at any time
after the first 40 seconds of STANDBY, a safety shutdown
occurs and is annunciated. A shutter-check amplifier and
self-checking detector are energized for the first 40 seconds
during STANDBY and the last two seconds before exiting
STANDBY. If a flame exists, a safety shutdown occurs. An
AMPLI-CHECK™ Amplifier is energized continually
through STANDBY to detect any possibility of a runaway
detector or a flame. If a flame exists, a safety shutdown
occurs.Astandardamplifierisenergizedcontinuallythrough
STANDBY. If a flame exists, a safety shutdown occurs.
TAMPER RESISTANT TIMING AND LOGIC
Safety and logic timings are inaccessible and cannot be
altered or defeated.
FIRST-OUT ANNUNCIATION AND SELF-DIAG-
NOSTICS
Sequence Status Lights (LEDs) provide positive visual
indication of the program sequence: POWER, PILOT,
FLAME, MAIN and ALARM. The green POWER LED
blinks every four seconds, signifying that the RM7885A
hardware is running correctly.
OptionalMulti-FunctionKeyboardDisplayModuleshows
elapsed time during PILOT IGN. As an additional trouble-
shooting aid, it provides diagnostic information, historical
information and expanded annunciator information that is
availableduringnormaloperationorwhenasafetyshutdown
or hold occurs.
First-out Annunciation reports the cause of a safety shut-
downoridentifiesthecauseofafailuretostartorcontinuethe
burner control sequence with an English text and numbered
codevia theoptional KeyboardDisplayModule. Itmonitors
all field input circuits, including the flame signal amplifier.
Thesystemdistinguishes33modesoffailureanddetectsand
annunciates difficult-to-find intermittent failures.
Self-Diagnostics add to the first-out annunciation by
allowing the RM7885A to distinguish between field (exter-
nal device) and internal (system related) problems. Faults
associatedwithintheflamedetectionsubsystemorRM7885A
are isolated and reported by the optional Keyboard Display
Module. See the 7800 SERIES System Annunciation Diag-
nostics and Troubleshooting, form 65-0118.

9 65-0107
RM7885A
INSTALLATION
Installation
WARNING
FIRE OR EXPLOSION HAZARD CAN
CAUSE PROPERTY DAMAGE, SEVERE
INJURY, OR DEATH
Verification of safety requirements must be per-
formed each time a control is installed on a burner
to prevent possible hazardous burner operation.
WHEN INSTALLING THIS PRODUCT...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous condi-
tion.
2. Check the ratings given in the instructions and on the
producttomake surethe productissuitableforyourapplica-
tion.
3. Installer must be a trained, experienced, flame safe-
guard service technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
CAUTION
1. Disconnect the power supply before beginning
installationtopreventelectricalshockandequip-
ment damage. More than one power supply
disconnect may be involved.
2. WiringconnectionsfortheRM7885Aareunique;
therefore,referto Fig.7 ortheapplicableSpeci-
fication for proper subbase wiring.
3. Wiring must comply with all applicable codes,
ordinances and regulations.
4. Wiring,whererequired,mustcomplywithNEC
Class 1 (Line Voltage) wiring.
5. Loads connected to the RM7885A must not
exceedthoselistedontheRM7885Alabelorthe
applicable Specification, see Table 1.
6. Limitsandinterlocksmustbe rated to carry and
break current to the ignition transformer, pilot
valve, and main fuel valve(s) simultaneously.
7. Allexternaltimersmust be listed or component
recognizedby authoritieswhohave jurisdiction
forthespecific purposefor whichtheyareused.
IMPORTANT:
1. For on-off gas-fired systems, some authorities who
have jurisdiction prohibit the wiring of any limit or
operating contacts in series between the flame safe-
guard control and the main fuel valve(s).
2. Two detectors of the same detection type can be
connected in parallel with the exception of infrared
detectors (C7015).
3. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in
accordance with the instructions, may cause interfer-
ence to radio communications. This equipment has
been tested and found to comply with the limits for a
Class B computing device of part 15 of FCC rules,
which are designed to provide reasonable protection
againstsuchinterferencewhenoperatedinacommer-
cial environment. Operation of this equipment in a
residential area may cause interference; in which
case,theusersattheirownexpensemayberequiredto
take whatever measures are required to correct this
interference.
4. This digital apparatus does not exceed the Class B
limitsforradionoiseofdigital apparatussetoutinthe
Radio Interference Regulations of the Canadian De-
partment of Communications.
HUMIDITY
Install the RM7885A where the relative humidity never
reaches the saturation point. The RM7885A is designed to
operate in a maximum 85% RH continuous, noncondensing
moisture environment. Condensing moisture may cause a
safety shutdown.
VIBRATION
Do not install the RM7885A where it could be subjected
to excessive vibration, 0.5G continuous maximum.
WEATHER
The RM7885A is not designed to be weather tight. If
installed outdoors, the RM7885A must be protected by an
approved weather-tight enclosure.
MOUNTING WIRING SUBBASE
NOTE: For installation dimensions, see Fig. 1 or 2.
1. Mountthesubbase inanypositionexcepthorizontally
with the bifurcated contacts pointing down. The standard
vertical position is recommended. Any other position de-
creases the maximum ambient temperature rating.
2. Select a location on a wall, burner or electrical panel.
TheQ7800canbemounteddirectlyinthecontrolcabinet.Be
sure to allow adequate clearance for servicing, installation,
access and removal of the RM7885A, Dust Cover, flame
amplifier, flame amplifier signal voltage probes, electrical
signal voltage probes and electrical field connections.
3. Forsurface mounting, use the back ofthesubbase as a
template to mark the four screw locations. Drill the pilot
holes.
4. Securely mount the subbase using four no. 6 screws.
!
!

10
RM7885A
INSTALLATION
Fig. 6—RM7885A Internal block diagram. (See Fig. 7 for detailed wiring instructions.)
MICROCOMPUTER
RESET
PUSHBUTTON
STATUS LEDs
SAFETY RELAY
CIRCUIT
POWER SUPPLY
OPTIONAL KEYBOARD
DISPLAY MODULE
PLUG-IN
FLAME
AMPLIFIER
RELAY
DRIVE
CIRCUIT
CONTROL
POWER
TEST
JACK
REMOTE
RESET
DDL
DDL
COMMUNICATIONS
INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
IGNITION
PILOT
MAIN VALVE(S)
1K
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
LIMITS
1K1 2K1
120 Vac
FLAME SIGNAL
TEST
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
RS485
123
L1
(HOT) L2
3
6
4K1
2K2
8
10
9
5K
4K
3K
2K
F
G
22
1
ALARM
3K1 4
L2
1M5133A
START
STOP
C D
A B
˚
S445A
4562
R4155A

11 65-0107
RM7885A
WIRING
Wiring
Referto Fig. 7 for proper subbasewiring.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
energizeduntil theend switchof thehigh-lowor modulating
motorisinthelowfireposition.Alsotopreventthehigh-low
or modulating motor from running in the high fire position
beforethemanuallyopenedsafety-shutoffvalveisopened,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.
Fig. 7—RM7885 wiring.
M5154A
G
L
2
3
4
5
6
7
8
9
1
0
F
(L1
)
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
1
2
MASTER
SWITCH
LIMITS
MAIN FUEL
VALVE(S)
120V ALARM
INTERMITTENT
PILOT
RECTIFYING FLAME
ROD, RECTIFYING
PHOTOCELL, OR INFRA-
RED (LEAD SULFIDE)
FLAME DETECTOR
C7027A, C7035A, OR
C7044A ULTRAVIOLET
FLAME DETECTOR
C7012A,C,E,F OR
C7076A ULTRAVIOLET
FLAME DETECTOR
120V, 60 Hz POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
FOR DIRECT SPARK IGNITION (OIL
OR GAS)
MAIN VALVE
L1
(HOT)
L21
OR
OR
BLUE
BLUE
WHITE
YELLOW
L2
WHITE
WHITE
BLACK
BLACK L1
L2
8
9 L
2
1
Q7800
2
2
DPST ALARM
SILENCING
SWITCH
IGNITION
STOP
START
B A
D C
S445A
START-STOP
STATION
INTERNAL
JUMPER

RM7885A
WIRING
12
Fig. 8—High-low or modulating burner diagram.
M5211
G
L
2
3
4
5
6
7
8
9
1
0
F
(L1
)
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
1
2
MASTER
SWITCH
LIMITS
LOW FIRE MOTOR
END SWITCH
120V ALARM
INTERMITTENT
PILOT
RECTIFYING FLAME
ROD, RECTIFYING
PHOTOCELL, OR INFRA-
RED (LEAD SULFIDE)
FLAME DETECTOR
C7027A, C7035A, OR
C7044A ULTRAVIOLET
FLAME DETECTOR
C7012A,C,E,F OR
C7076A ULTRAVIOLET
FLAME DETECTOR
120V, 60 Hz POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
L1
(HOT)
L2
1
OR
OR
BLUE
BLUE
WHITE
YELLOW
WHITE
WHITE
BLACK
BLACK
1
Q7800
2
DPST ALARM
SILENCING
SWITCH
IGNITION
STOP
START
B A
D C
S445A
START-STOP
STATION
INTERNAL
JUMPER
2
FUEL
PRESSURE
SWIITCH
MANUAL
VALVE
1 2 6 7 8
R482B
R W B
CONTROLLE
R
R W B
T T
HI-LO OR
MODULATING
MOTOR
Fig.9shows a recommended circuit for cascading two or
more burners. Each pilot is ignited and supervised by its
respective controller, ignition transformer, limit control,
flame detection system and RM7885A. The main gas valve,
however, is not energized until all pilots have been ignited
andproved,andtheirrespectiveRM7885Aflamerelayshave
pulledin.Failureofanyofthepilotstoignitewillpreventthe
main gas valve from being energized.
Fig. 10 shows typical connections for a combination gas-
oil application using high-low or modulating valves on both
fuelsystems,andpilotignitiononbothcycles.Withthemotor
end-switches and the R482B Relays connected as shown, a
guaranteed low fire start is assured on either cycle. Note that
the fuel switchover control switch is ganged.
Fig. 11 shows the connection for wiring the R4155A
Alarm Silencing Relay.

13 65-0107
RM7885A
WIRING
Fig. 9—Cascading two or more burners or supervising two or more pilots when required for safe ignition
of one burner.
M5212
G
L2
3
5
6
7
8
9
10
F
(L1)
13
14
15
16
17
18
19
20
21
22
12
MASTER
SWITCH
IGNITION
INTERMITTENT
PILOT
RECTIFYING FLAME
ROD, RECTIFYING
PHOTOCELL, OR INFRA-
RED (LEAD SULFIDE)
FLAME DETECTOR
120V, 60 HZ. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
120 ALARM 120 ALARM
L1
(HOT)
L2
WHITE
WHITE
BLACK BLACK
WHITE
Q7800
4
OR
OR
YELLOW
BLUE
BLUE
C7027A, C7035A, OR
C7044A ULTRAVIOLET
FLAME DETECTOR
C7012A,C,E,F OR
C7076A, ULTRAVIOLET
FLAME DETECTOR
1
2
2
1
LIMITS
STOP
S445A
START-STOP
STATION
START
BA
DC
INTERNAL
JUMPER
DPST ALARM
SILENCING
SWITCH
G
L2
3
5
6
7
8
9
10
F
(L1)
13
14
15
16
17
18
19
20
21
22
12
IGNITION
RECTIFYING FLAME
ROD, RECTIFYING
PHOTOCELL, OR INFRA-
RED (LEAD SULFIDE)
FLAME DETECTOR
WHITE
WHITE
BLACK BLACK
WHITE
Q7800
4
OR
OR
YELLOW
BLUE
BLUE
C7027A, C7035A, OR
C7044A ULTRAVIOLET
FLAME DETECTOR
C7012A,C,E,F OR
C7076A, ULTRAVIOLET
FLAME DETECTOR
2
LIMITS
STOP
S445A
START-STOP
STATION
START
BA
DC
INTERNAL
JUMPER
DPST ALARM
SILENCING
SWITCH
INTERMITTENT
PILOT
MAIN FUEL
VALVE(S)

RM7885A
WIRING
14
Fig. 10—Dual fuel with high-low or modulating burner.
M5213
G
L2
3
5
6
7
8
9
10
F
(L1)
13
14
15
16
17
18
19
20
21
22
12
MASTER
SWITCH
IGNITION
LOW FIRE MOTOR
END SWITCH
RECTIFYING FLAME
ROD, RECTIFYING
PHOTOCELL, OR INFRA-
RED (LEAD SULFIDE)
FLAME DETECTOR
120V, 60 HZ. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
120V ALARM
L1
(HOT)
L2
WHITE
WHITE
BLACK BLACK
WHITE
Q7800
4
OR
OR
YELLOW
BLUE
BLUE
C7027A, C7035A, OR
C7044A ULTRAVIOLET
FLAME DETECTOR
C7012A,C,E,F OR
C7076A, ULTRAVIOLET
FLAME DETECTOR
1
2
2
1
LIMITS
STOP
S445A
START-STOP
STATION
START
BA
DC
INTERNAL
JUMPER
DPST ALARM
SILENCING
SWITCH
FUEL
PRESSURE
SWITCH
MANUAL
VALVE
12
6
7
8
R
W
B
R
W
B
T
T
CONTROLLER
HI-LO OR
MODULATING
MOTOR
R482B
FUEL
PRESSURE
SWITCH
MANUAL
VALVE
12
6
7
8
R
W
B
R
W
B
T
T
CONTROLLER
HI-LO OR
MODULATING
MOTOR
R482B
PILOT
MOTOR
GANGED 3 POLE
DOUBLE THROW
SWITCH
GAS OIL

RM7885A
WIRING
15 65-0107
Fig. 11—RM7885A wiring with R4155 alarm silencing relay.
M5214
G
L
2
3
4
5
6
7
8
9
1
0
F
(L1
)
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
1
2
MASTER
SWITCH
LIMITS
MAIN FUEL
VALVE(S)
ALARM
INTERMITTENT
PILOT
RECTIFYING FLAME
ROD, RECTIFYING
PHOTOCELL, OR INFRA-
RED (LEAD SULFIDE)
FLAME DETECTOR
C7027A, C7035A, OR
C7044A ULTRAVIOLET
FLAME DETECTOR
C7012A,C,E,F OR
C7076A ULTRAVIOLET
FLAME DETECTOR
120V, 60 Hz POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
FOR DIRECT SPARK IGNITION (OIL
OR GAS)
MAIN VALVE
L1
(HOT)
L21
OR
OR
BLUE
BLUE
WHITE
YELLOW
L2
WHITE
WHITE
BLACK
BLACK L1
L2
8
9 L
2
1
Q7800
2
2
R4155A
IGNITION
STOP
START
B A
D C
S445A
START-STOP
STATION
INTERNAL
JUMPER
4 5 6 2
For proper wiring of optional Keyboard Display Module
mounted remotely, DATA CONTROLBUS MODULE™,
Remote Reset Module or Communication Interface Base
Unit, refer to Specifications, form 65-0090, 65-0091, 65-
0095 or 63-2278, respectively.
2. Disconnect the power supply from the main discon-
nectbefore beginninginstallation topreventelectrical shock
and equipment damage. More than one disconnect may be
involved.
3. Allwiring must comply with all appropriate electrical
codes, ordinances and regulations. Wiring, where required,
must comply with NEC Class 1 (Line Voltage) wiring.
4. Recommendedwiresizeandtype:useno.14,16,or18
copperconductorwire(TTW60CorTHW75CorTHHN90C),
600 volt insulation wire for all line voltage terminals. For
high temperature installations, use wire selected for a tem-
perature rating above the maximum operating temperature.
All leadwires must be moisture resistant.

RM7885A
WIRING • ASSEMBLY
5. Recommended grounding practices:
a. Use the earth ground to provide a connection be-
tween the subbase and the control panel or the
equipment.The earth ground wire must becapable
of conducting the current to blow the 20A fuse (or
breaker) in event of an internal short circuit. The
RM7885A requires a low impedance ground con-
nection to the equipment frame which, in turn,
requires a low impedance connection to earth
ground. For a ground path to be low impedance at
RF frequencies, the connection must be made with
minimum length conductors that have a maximum
surface area. Wide straps or brackets are preferred
rather than leadwires. Be careful to verify that
mechanically tightened joints along the ground
path, such as pipe or conduit threads or surfaces
heldtogetherwithfasteners,arefreeofnonconduc-
tive coatings and have protected against corrosion
on mating surfaces.
b. Ground the earth ground terminal for each
RM7885A that must be grounded to the metal
control panel with wire as short as practical. Each
ground wire must be capable of carrying a fault
current equal to the rating of the protective fuse
(20A). A number 14 copper conductor is adequate
butwidestrapsorbracketsarepreferredratherthan
leadwires.
6. Recommended wire routing for flame detector
leadwires:
1. Do not run high voltage ignition transformer wires
inthesameconduitwiththeflamedetectionwiring.
2. Do not route scanner wires in a conduit with line
voltage circuits.
3. Enclosescannerwireswithoutarmorcableinmetal
cable or conduit.
4. Follow directions given in the flame detector In-
structions.
7. Maximum wire lengths:
a. For the RM7885A, the maximum length of
leadwiretotheterminalinputs(Control)is300feet.
b. For the Flame Detector leadwires, the maximum
flamesensorleadwirelengthislimitedbytheflame
signal strength.
8. Make sure loads do not exceed the terminal ratings.
Refer to the label on the RM7885A or to the ratings of the
applicable Specification, see Table 1.
9. Check the power supply circuit. The voltage and
frequency tolerance must match those of the RM7885A. Do
notconnecttheRM7885Atoapowersupplycircuitthatcan
have line voltage variations, such as on-off switching of
heavyloads.Aseparatepowersupplycircuitmayberequired
for the RM7885A with the required disconnect means and
overload protection added.
10. Check all wiring circuits and complete Static Check-
out,Table 4, before installing theRM7885Aon the subbase.
11. Install all electrical connectors.
12. Restore power to the panel.
16
Assembly
MOUNTING RM7885A
NOTE: For installation dimensions, see Fig. 1 or 2.
RELAY MODULE MOUNTING
1. Mount the RM7885A vertically, see Fig. 12 or 13 or
mount horizontally with the knife blade terminals pointing
downward. When mounted on the Q7800A, the RM7885A
must be in an electrical enclosure.
2. Select the location in the electrical enclosure. Be sure
to allow adequate clearance for servicing, installation and
removal of the RM7885A, Dust Cover, flame amplifier,
flame amplifier signal voltage probes, electrical signal volt-
age probes and electrical connections.
a. Allow an additional two inches below the RM7885A
for the flame amplifier mounting.
b. Allowanoptionalthree inchesminimum toboth sides
of the RM7885A for electrical signal voltage probes.
3. Makesurenosubbase wiring is projecting beyond the
terminal blocks. Tuck wiring in against the back of the
subbasesoitdoesnotinterferewiththeknifebladeterminals
or bifurcated contacts.
4. Mount the RM7885A by aligning the four L shaped
corner guides and knife blade terminals with the bifurcated
contactsonthewiringsubbaseandtighteningthetwoscrews
securely without deforming the plastic.
IMPORTANT: Use plug in action to install the RM7885
rather than hinge action.
Fig. 12—Electrical panel installation.

Fig. 13—Wall or burner installation. INSTALLING PLUG-IN FLAME SIGNAL
AMPLIFIER
1. Disconnect the power supply before beginning instal-
lation to prevent electrical shock and equipment damage.
More than one disconnect may be involved.
2. Align the amplifier circuit board edge connector with
the keyed receptacle on the RM7885A. Verify the amplifier
nameplate faces away from the Relay Module, see Fig. 15.
3. Push in the amplifier until the circuit board is fully
inserted into the receptacle and then push the amplifier
toward the RM7885A retaining clasp.
4. Verify the amplifier is firmly in place.
5. Perform all required checkout tests.
Fig. 15—Flame signal amplifier mounting.
Fig. 14—Dust Cover mounting.
MOUNTING DUST COVER
1. Alignthetwo interlockingearsoftheDust Coverwith
the two mating slots on the RM7885A, see Fig. 14.
2. Insert the two interlocking ears into the two mating
slotsand,withahingeaction,pushontheuppercornersofthe
Dust Cover to secure it to the RM7885A.
3. Be sure the Dust Cover is firmly in place.
17 65-0107
RM7885A
ASSEMBLY
INSTALLING THE FLAME DETECTOR
NOTE: Table 2 and Fig. 16 list the flame detection systems
available for use with the RM7885A. Make sure the
correct combination of amplifier and flame detector(s) is
used.
Properflamedetectorinstallationisthebasisofasafeand
reliableflamesafeguardinstallation.RefertotheInstructions
packed with the flame detector and the equipment manufac-
turer instructions.
Keeptheflame signalleadwiresasshortas possiblefromthe
flame detector to the wiring subbase. Capacitance increases
withleadwirelength,reducingthesignalstrength.Themaxi-
mum permissible leadwire length depends on the type of
flame detector, leadwire and conduit. The ultimate limiting
factor in the flame detector leadwire is the flame signal, see
Table 5.

RM7890A,B
ASSEMBLY
18
FIG. 16—Flame detector wiring.
BLUE
YELLOW
WHITE
WHITE
BLACK
BLACK
F
G
22
L2
L1
L2
BLUE
WHITE
F
G
WHITE
BROWN
F
G
INFRARED (C7015)
ULTRAVIOLET (C7027/C7035/C7044)
SOLID STATE SELF-CHECKING
ULTRAVIOLET (C7012E,F)
BLUE
YELLOW
BLACK
BLACK
F
G
L1
L2
SOLID STATE
ULTRAVIOLET (C7012A,C)
1
22
F G
4
5
3
L2
C7076A,D ULTRAVIOLET DETECTOR
522
6
SHUTTER
G
SHUTTER
F
1
8
2
7
7800 SERIES
L1
L2
3a 3b
REMOTE
SENSOR
2b
2a
EARTH
GROUND
C7076A
OR
C7076D
TERMINAL
BLOCK
L2 (COMMON)
L1 (HOT)
G
F
X
X
FLAME ROD
G
F
X
X
PHOTOCELL
M1969A
1FLAME DETECTOR LEADS ARE COLOR CODED. THE BLUE LEAD MUST BE CONNECTED TO THE F TERMINAL AND THE WHITE
MUST BE CONNECTED TO THE G TERMINAL. THE UV SENSING TUBE IS POLARITY SENSITIVE. REVERSING THE LEADS EVEN
MOMENTARILY CAN DAMAGE OR DESTROY THE UV TUBE.
FLAME DETECTOR LEADS ARE COLOR CODED. THE BLUE LEAD MUST BE CONNECTED TO THE F TERMINAL AND THE YELLOW
MUST BE CONNECTED TO THE G TERMINAL. THE UV SENSING TUBE IS POLARITY SENSITIVE. REVERSING THE LEADS EVEN
MOMENTARILY CAN DAMAGE OR DESTROY THE UV TUBE.
2

RM7885A
OPERATION
19 65-0107
Operation
LIMITS, STOP
STATION AND
SILENCING SWITCH
M5194
RM7885
POWER
00
LED
DISPLAY
BURNER
START
FLAME
SIGNAL
INITIATE
POWER
PILOT
FLAME
MAIN
ALARM
POWER
STANDBY
POWER POWER
PILOT
FLAME
MAIN
PFEP
PILOT
FLAME
MAIN
POWER
RUN STANDBY
15 MINUTES
INTERMITTENT PILOT
MAIN VALVE
SAFE START CHECK FLAME PROVING
9
8
10
L1 6
TO
00
POWER
SAFE-
START
MAIN FUEL VALVE WILL BE ENERGIZED DURING PFEP IF FLAME IS PROVEN.
1
1
ALARM ALARM
START SWITCH
LIMITS, STOP STATION AND ALARM SILENCING SWITCH CLOSED
Fig. 17—RM7885A sequence.
Sequence of Operation
The operating sequence for the RM7885A follows, see
Figs. 17, 18, and Table 3.
NOTE: The alarm will sound until a flame is sensed.
INITIATE
The RM7885A enters the INITIATE sequence when the
RelayModuleispowered. The RM7885A can also enter the
INITIATEsequencewhentheRelayModuleverifiesvoltage
fluctuations of +10/-15% or frequency fluctuations of +/-
10% during start-up or run sequences. The INITIATE se-
quence lasts for ten seconds unless the voltage or frequency
tolerances are not met. When the tolerances are not met, a
hold condition will be initiated and will be displayed on the
optional VFD for at least five seconds. When the tolerances
aremet,the INITIATEsequence willrestart.Ifthecondition
isnotcorrectedandtheholdconditionexistsforfourminutes,
theRM7885Awilllockout.Causesforholdconditionsinthe
INITIATE sequence are:
• AC line dropout is detected.
• Brownouts caused by a low line voltage.
• AC line noise that can prevent a sufficient reading of
the line voltage inputs.
• AClinefrequencyerrorcausedbyusinga60Hzdevice
on a 50 Hz line or vice versa.
STANDBY
TheRM7885AwillbeintheSTANDBYmodeafterithas
completedtheINITIATEstartuportheStopSwitchhasbeen
pressed. The POWER LED will blink every four seconds,
signifying an internal hardware check has been completed.
TheALARMLEDwill also be lit and an external alarm will
be activated.
NORMAL START-UP
When the Start Switch is pressed, the Ignition Trans-
formerisenergizedandpowerisappliedtoterminal10ofthe
RM7885A.Ifallmicrocomputermonitoredcircuitsareinthe
correctstate,theRM7885willinitiateaSafe-StartCheckand
Ignition Trials.
SAFE START CHECK (TWO SECONDS)
The RM7885A conducts a two-second Safe-Start Check
as it verifies that critical loads are in the proper state prior to
start-up and that no flame is present in the combustion
chamber.
IGNITION TRIALS
After completing a successful Safe-Start Check, the
RM7885 will provide power to the Intermittent Pilot Valve,
terminal 8 and turn on the PILOT LED.
When flame is proven, the FLAME LED will light, the
ALARMLEDwillshutoffandtheRM7885willbringonthe
Main Valve and turn on the MAIN LED.
TheStartSwitchcan nowbe released,which willshut off
the Ignition Transformer.
NOTE:ThePilot Valvewill followthe StartSwitch untilthe
flameisproven.Then it will be in control of the RM7885
(for example, pushing and releasing the Start Switch will
bring on and shut off the Ignition Transformer and the
Pilot Valve until the flame is proven.)
RUN
The RM7885A is now in RUN and will remain in RUN
until the Stop Switch is pressed or a Limit opens terminal 6.

TABLE 3—LED SEQUENCE STATUS DISPLAY INFORMATION.
Burner Sequence LEDs Energized
INITIATE POWER, PILOT, FLAME, MAIN and ALARM
STANDBY POWER, PILOT, FLAME, MAIN and ALARM
STANDBY HOLD: F/G POWER, PILOT, FLAME, MAIN and ALARM
(Flame Detected)
SAFE-START CHECK POWER, PILOT, FLAME, MAIN and ALARM
PILOT IGNITION POWER, PILOT, FLAME, MAIN and ALARM
RUN POWER, PILOT, FLAME, MAIN and ALARM
RESET/ALARM TEST POWER, PILOT, FLAME, MAIN and ALARM
See Table 6 for further details of Hold conditions.
20
RM7885A
OPERATION
Fig. 18—Sequence status LEDs.
STATIC CHECKOUT
CAUTION
1. Useextreme carewhile testingthesystem. Line
voltageis present on most terminal connections
when power is on.
2. Open the master switch before installing or
removing a jumper on the subbase.
3. Before continuing to the next test, be sure to
remove the test jumper(s) used in the previous
tests.
4. Replace all limits and interlocks not operating
properly. Do not bypass limits and interlocks.
5. Close all manual fuel shutoff valve(s) before
starting these tests.
After checking all wiring, perform this checkout before
installing the RM7885A on the subbase. These tests verify
that the Q7800 Wiring Subbase is wired correctly, and that
the external controllers, limits, interlocks, actuators, valves,
transformers, motors and other devices are operating prop-
erly.
NOTE: Do not perform a dielectric test with the RM7885A
installed. Internal surge protectors will break down and
conduct a current. This could cause the RM7885A to fail
thedielectrictestorpossiblydestroytheinternallightning
and high current transient protection components.
EQUIPMENT REQUIRED
1. Voltmeter (20 kohm/volt minimum sensitivity) set on
the 0-300 Vac scale.
2. Two jumper wires, no. 14 wire, insulated, 12 inches
(304.8 mm) long, with insulated alligator clips at both ends.
GENERAL INSTRUCTIONS
1. Perform all applicable tests listed in Static Checkout,
Table 4, in the order listed.
2. MAKE SURE THAT ALL MANUAL FUEL
SHUTOFF VALVE(S) ARE CLOSED.
3. For each test, open the master switch, remove the
jumper from the previous test and and install the jumper
wire(s) between the subbase wiring terminals listed in the
Test Jumpers column of Table 4.
4. Close the master switch before observing operation.
5. Readthevoltagebetweenthesubbasewiringterminals
listed in the Voltmeter column of Table 4.
6. If there is no voltage or the operation is abnormal,
checkthecircuitsandexternaldevicesasdescribedinthelast
column.
7. Checkallwiringforcorrectconnections,tightterminal
screws, correct wire, and proper wiring techniques. Replace
all damaged or incorrectly sized wires.
8. Replace faulty controllers, limits, interlocks, actua-
!
SEQUENCE
STATUS
LEDs
RESET
PUSHBUTTON
FLAME
SIMULATOR INPUT FLAME CURRENT
TEST JACKS
CAPTIVE
MOUNTING
SCREW
DUST
COVER
RELAY
MODULE
FLAME
AMPLIFIER
M8995