Yamatake-Honeywell 7800 Series Operation manual

PRODUCT DATA
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
65-0203
7800 SERIES
EC7885A/RM7885A Relay Module
APPLICATION
The Yamatake Honeywell EC7885/RM7885 is a microprocessor based
integrated burner control for semi-automatically fired gas, oil or
combination fuel single burner industrial applications.The 7885A
requires a Relay Module Subbase and Amplifier to complete the
system. Options include Keyboard Display Module, Personal Computer
Interface, DATA CONTROLBUS MODULE™, Remote Display Module
and COMBUSTION SYSTEM MANAGER™ Software.
The 7885A is programmed to provide a level of safety, functional capability
and features beyond the capacity of conventional controls.
The 7885A is adaptable to continuous firing, high-low or modulating
firing rate for semi-automatic burner sequencing. Functions
provided by the 7885 include flame supervision, system status
indication, system or self-diagnostics and troubleshooting.
The 7885A operates 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-ignited pilot using the S445A Start-Stop Station, 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).
FEATURES
• 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-term operation provided by microcomputer
technology.
• First-out annunciation and system diagnostics are provided by
an optional 2 row by 20 columnVacuum Fluorescent Display
(VFD) located on the optional Keyboard Display Module.
• Five LEDs for sequence information.
• Interchangeable plug-in flame amplifiers.
• Local or remote annunciation of 7885A operation and fault
information (optional).
• Nonvolatile memory; 7885A retains history files and
sequencing status after loss of power.
• Remote reset (optional).
• Report generation (optional).
• Shutter drive output.
• Burner controller data (optional):
— 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.
– 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 7885A and optional
Keyboard Display Module.
Contents
Application........................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Informationn ......................................................... 2
Principal Technical Features ............................................... 8
Safety Provisions ................................................................ 8
Installation ........................................................................... 9
Assembly............................................................................. 16
Operation ............................................................................ 19
Checkout ............................................................................. 21
Troubleshooting .................................................................. 28

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203 2
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets 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 Logistics
Honeywell Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386 [phone]
In Canada—Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, NorthYork, Ontario M2H 3N7.
International Sales and Service Offices in all principal cities of the world.Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
SPECIFICATIONS
Electrical Ratings, RM7885A seeTable 1A:
Voltage and Frequency: 100 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 1A. RM7885ATerminal Ratings.
Terminal No. Description Ratings
G Flame Sensor Ground
Earth G Earth Ground.
1
L2(N) Line Voltage Common
3 Line Voltage Supply (L1) 100 Vac (+10/-15%), 50 or 60 Hz (+/- 10%).
2,3,4
4 Alarm 100 Vac, 1A pilot duty.
5 Unused
6 Stop Station 100 Vac, 9A.
7 Unused
8 Pilot Valve 100 Vac, 4.5A ignition and 50 VA pilot duty.
4
9 Main Fuel Valve 100 Vac, 2A pilot duty.
5
10 Start Input 100 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 100 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 in event of an internal short circuit. The RM7885A needs a low impedance ground connection to the
equipment frame that, in turn, 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.
2Range of allowable operating frequency 45 to 66 Hz.
32000 VA maximum connected load to RM7885A Assembly.
4Can also be 100 Vac, 1A pilot duty.
5Can also be 65 VA pilot duty with motorized valve, 1150 VA inrush, 460 VA open, 250 VA hold.

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
3
Electrical Ratings, EC7885A seeTable 1B:
Voltage and Frequency: 200 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.
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 Fig. 1 and 2.
Weight:
7885A with Dust Cover: 1 pound 13 ounces, unpacked.
IMPORTANT
Flame Detection System available for use with
7885A.To select your Plug-in Flame Signal Amplifier
and applicable Flame Detector, see Table 2 and Fig.
3 through 5.
Terminal No. Description Ratings
G Flame Sensor Ground
Earth G Earth Ground.
1
L2(N) Line Voltage Common
3 Line Voltage Supply (L1) 200 Vac (+10/-15%), 50 or 60 Hz (+/- 10%).
2,3
4 Alarm 200 Vac, 1A pilot duty.
5 Unused
6 Stop Station 200 Vac, 9A.
7 Unused
8 Pilot Valve 200 Vac, 4A at PF=0.5, 20A inrush.
9 Main Fuel Valve 200 Vac, 4A at PF=0.5, 20A inrush.
10 Start Input 200 Vac, 4A at PF=0.5, 20A inrush.
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 200 Vac, 0.5A
1The EC7885A 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 in event of an internal short circuit. The EC7885A needs a low impedance ground connection to the
equipment frame that, in turn, 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.
2Range of allowable operating frequency: 45 to 66 Hz.
32000 VA maximum connected load to EC7885A Assembly.
Table 1B. EC7885ATerminal Ratings.

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203 4
Table 2. Flame Detection Systems.
Plug-in Flame Signal Amplifiers Applicable Flame Detectors
Type Color Self- Checking Model Flame Failure Response Time Fuel Type Models
Rectification Green No R7847A .8 or 3 sec Gas Rectifying
Flame Rod
Holdersa
C7004, C7007, C7011.
Complete Assemblies:
C7008, C7009, Q179.
No R7847A .8 or 3 sec Oil Rectifying
PhotocelleC7003, C7010, C7013, C7014.e
No R7847A 3 sec Gas, oil, coal Ultraviolet
(Purple
Peeper)
C7012A,C.b
Dynamic
AMPLI-
CHECK®
R7847Bc.8 or 3 sec Gas Rectifying
Flame Rod
Holdersa
C7004, C7007, C7011.
Complete Assemblies:
C7008, C7009, Q179.
Dynamic
AMPLI-
CHECK®
R7847Bc.8 or 3 sec Oil Rectifying
Photocell C7003, C7010, C7013, C7014.e
Dynamic
AMPLI-
CHECK®f
R7847Bc3 sec Gas, oil, coal Ultraviolet
(Purple
Peeper)
C7012A,C.b
Dynamic
Self-
Checkf
R7847Cd,f 3 sec Gas, oil, coal Ultraviolet
(Purple
Peeper)
C7012E,F.
Infrared Red No R7848A 3 sec Gas, oil, coal Infrared
(Lead Sulfide) C7015.
Dynamic
AMPLI-
CHECK®
R7848Bc3 sec Gas, oil coal Infrared
(Lead Sulfide) C7015.
Ultraviolet Purple No R7849A .8 or 3 sec Gas, oil Ultraviolet
(Minipeeper) C7027, C7035, C7044.b
Dynamic
AMPLI-
CHECK®
R7849Bc.8 or 3 sec Gas, oil Ultraviolet
(Minipeeper) C7027, C7035, C7044.b
Purple Dynamic
Self-
Checkf
R7861A .8 sec Gas, oil, coal Ultraviolet C7061.
Blue Dynamic
Self-
Checkf
R7886Ad3 sec Gas, oil, coal Ultraviolet
(Adjustable
Sensitivity)
C7076.
aOrder flame rod separately; see holder Instructions.
bThe 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 or
the C7061 Flame Detector with the R7861 Amplifier as the ultraviolet flame detection system.
cCircuitry tests the flame signal amplifier at least 12 times a minute during burner operation and shuts down the burner if the
amplifier fails.
dCircuitry 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.
eUse only Honeywell Photocell, part no. 38316, ONLY.
fRequires the use of a separate step down transformer when used with the EC7885A. See figure 16.

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
5
SequenceTiming for Normal Operation
Device Initiate Standby Ignition Run
7885A 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.
Approvals:
Underwriters Laboratories Inc. listed: File No. MP268,
Guide No. MCCZ on RM7885A only.
Mounting:
Q7800A: panel mount.
Q7800B: wall or burner mount.
Required Components:
Plug-in Flame Signal Amplifier, see Table 2.
Wiring Subbase:
Q7800A1005: panel mounted.
Q7800B1003: wall mounted.
Accessories:
Optional:
ControlBus 5-Wire Electrical Connector, part no.
203541.
COMBUSTION SYSTEM MANAGER™, part no.
ZM7850A1001.
Communication Interface Base Unit, part no.
Q7700B1004.
Communication Interface ControlBus Module, part no.
QS7800A1001.
Keyboard Display Module, part no. S7800A.
DATA CONTROLBUS MODULE™, part no.
S7810A1009.
Remote Reset Module, part no.S7820A1007.
Flame Simulators:
UV Flame Simulator, part no. 203659.
Rectification Simulator, part no. 123514A.
Remote Display Mounting Bracket, part no. 203765.
Remote Display Power Supply :
Plug-in, part no. 203968A.
Screw Terminal, part no. 203969A.
Replacement Parts:
Dust Cover, part no. 221729.
Electrical Access Slot Covers, part no.221779
(Q7800B only).
POWER
PILOT
FLAME
MAIN
ALARM
RESET
5
(127)
5 (127)
M11135
(133)
BURNER
CONTROL
REMOVE ONLY FOR TERMINAL TEST ACCESS.
1
1
5-1/4
Fig. 1. Mounting dimensions of 7885A Relay Module and Q7800A Subbase in in. (mm).

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203 6
Fig. 2. Mounting dimensions of 7885A Relay Module and Q7800B Subbase in in. (mm).
POWER
PILOT
FLAME
MAIN
ALARM
RESET
5
(127)
5 (127)
M11134
REMOVE ONLY FOR TERMINAL TEST ACCESS.
1
1
6-3/32 (155)
BURNER
CONTROL
Fig. 3. Rectification detectors mounting dimensions in in. (mm).
2
(51)
C7013A C7014A
M1847
13/16 (21) 1-1/4 (32) 1-3/8 (35)
1-3/4
(45)
1-1/4 (32) 1-5/16 (33) 5/16
(8)
THREADED
MOUNTING
HOLES (2)–
10-32 UNF
1 (25)
FLAME ROD
TARGET
CERAMIC
INSULATORS
IGNITION
ELECTRODE
(Q179C ONLY)
BRACKET
M1983A
3-1/8
(79)
1-21/32
(42) 1-13/32
(36)
3/8 (10)
1/2 (13)
1-1/16
(27)
25/32
(20) 25/32 (20)
2-25/32
(62)
3/32 (2) 11/16
(18)
17/32
(14)
Q179
MOUNTING FLANGE
1/2–14 NPSM
LEADWIRES FACEPLATE
3/4–14 NPT
M1962B
3-3/4
(95)
7-7/32
(183)
5-1/8 (130)
3-7/16
(87)
5-1/4 (133)
C7012A,C,E,F

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
7
Fig. 4. Ultraviolet detectors mounting dimensions in in. (mm) (continued on next page).
COLLAR WITH 1/2-14 NPSM
INTERNAL THREADS
4 (102) 6 FOOT (1.83 METER)
LEADWIRES (2)
M1943B
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
3-1/2 (89)
1-1/16
(27)
C7027
1/2-14 NPSM
INTERNAL THREADS
2
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
3
INSERTION DEPTH
6 FOOT
[1.83 METER]
LEADWIRES (2) 3
M1945B
2-5/8 (67)
1-1/2
(38)
31/32
(25)
4-1/8 (105)
1-3/16
(30)
C7035
MOUNTING BRACKET
6 FOOT [1.83 METER]
LEADWIRES (2)
M1944B
3-5/8 (92)
1/2
(13)
9/16
(14)
7/8
(22)
3/8
(10)
1-27/64
(36)
C7044
4
(102)
4 (102)
3/8 INCH NPT
1 INCH NPT
7/8 (22) OPENING
FOR 1/2-INCH CONDUIT
ALLOW 9 INCHES (228 MILLIMETERS)
CLEARANCE TO SWING OUT THE DETECTOR
FOR LENS CLEANING OR SERVICING.
1
M5083B
1-1/16 (27)
2-1/4
(57)
2-1/4
(57)
4-27/32 (123)
1-13/32 (188)
10-9/32 (261)
2-5/16
(58)
29/32 (23)
3/4 (19)
1-19/32
(41)
2-11/16
(68) 7-5/8 (194)
C7076A

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203 8
Fig. 4. Ultraviolet detectors mounting dimensions in in. (mm) (continued from previous page).
Fig. 5. Infrared Detector dimensions in in. (mm).
PRINCIPAL TECHNICAL FEATURES
The 7885A 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
section.
b. Four minute INITIATE period was 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.
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.
SAFETY PROVISIONS
Internal Hardware Status Monitoring
The 7885A analyzes the integrity of the internal hardware.
The POWER LED blinks every four seconds to signify an
internal hardware check.
Closed Loop Logic Test
The test verifies the integrity of all safety critical loads,
terminals 8 and 9. If the loads are not energized properly; i.e.,
the main valve terminal is powered during STANDBY, the
7885A locks out on safety shutdown.The 7885A 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
spikes or short periods of line dropout. Signal conditioning is
tolerant of synchronous 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 7885A if
the flame amplifier fails.
Dynamic Flame Amplifier And Shutter Check
Self-checking circuitry tests all electronic components in the
flame detection system and amplifier 12 times per minute and
shuts down the 7885A if the detection system fails.
Dynamic Input Check
All system input circuits are examined to assure that the
7885A is capable of recognizing the true status of external
controls, limits and interlocks. If any input fails this test, a
safety shutdown occurs and the fault is annunciated.
Dynamic Safety Relay Test
Checks the ability of the dynamic safety relay contact to open
and close.Verifies that the safety critical loads, terminals 8
and 9, can be de-energized, as required, by the Dynamic
Self-Check Logic.
APERTURE
BUSHING WITH
MAGNIFYING LENS COLLAR, 3/4-14 NPSM
INTERNAL THREADS
3/4-14
NPSM 3/4-14 NPSM INTERNAL
THREADS
HEAT BLOCKCELL MOUNT
M1982A
2 LEADS IN A
48 INCH (1.2 METER)
FLEXIBLE CONDUIT
2-3/4
(70)
1-1/4
(32)
1-5/8 (41)
1-1/16 (27)
1-1/4
(32)
C7015
15/16 (24) DIA.
2 (51)
1 (25)
1 INCH NPT
15/16–18 UNC
(2 EACH)
M5084B
2-1/2
(64)
6-7/32
(158)
6-19/32
(168)
2-5/32
(55)
11-13/16 (300)
7-13/16 (198) 1-27/32
(47) 5-13/16 (147)
5-13/16
(147)
C7076D

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
9
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 are de-
energized.
Expanded Safe-Start Check
The conventional safe-start check, which prevents burner
start-up if flame is indicated at start-up, is expanded to
include a flame signal check during STANDBY and a safety
critical load check.
Off Cycle (Standby) Flame Signal Check
The flame detection subsystem (flame detector and amplifier)
is monitored during STANDBY. If a flame simulating condition
or an actual flame exists, a system hold 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. A standard
amplifier is energized continually through 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-Diagnostics
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 7885A hardware is
running correctly.
Optional Multi-Function Keyboard Display Module shows
elapsed time during PILOT IGN.As an additional
troubleshooting aid, it provides diagnostic information and
historical information that is available during normal operation
or when a safety shutdown or hold occurs.
First-out Annunciation reports the cause of a safety shutdown
or identifies the cause of a failure to start or continue the
burner control sequence with text and numbered code via the
optional Keyboard Display Module. It monitors all field input
circuits, including the flame signal amplifier.The system
distinguishes 33 modes of failure and detects and
annunciates difficult-to-find intermittent failures.
Self-Diagnostics add to the first-out annunciation by allowing
the 7885A to distinguish between field (external device) and
internal (system related) problems. Faults associated within
the flame detection subsystem or 7885A are isolated and
reported by the optional Keyboard Display Module. See the
7800 SERIES System Annunciation Diagnostics and
Troubleshooting, form 65-0118.
INSTALLATION
WARNING
FIRE OR EXPLOSION HAZARD CAN CAUSE
PROPERTY DAMAGE, SEVERE INJURY, OR
DEATH
Verification of safety requirements must be performed
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
condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced, flame
safeguard 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
installation to prevent electrical shock and
equipment damage. More than one power supply
disconnect may be involved.
2. Wiring connections for the 7885A are unique;
therefore, refer to Fig. 7 or the applicable
Specification for proper subbase wiring.
3. Wiring must comply with all applicable codes,
ordinances and regulations.
4. Wiring, where required, must comply with NEC
Class 1 (Line Voltage) wiring.
5. Loads connected to the 7885A must not exceed
those listed on the 7885A label or the applicable
Specification, see Table 1.
6. Limits and interlocks must be rated to carry and
break current to the ignition transformer, pilot
valve, and main fuel valve(s) simultaneously.
7. All external timers must be listed or component
recognized by authorities who have jurisdiction
for the specific purpose for which they are used.
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
safeguard 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).

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203 10
WARNING
This equipment generates, uses, and can radiate
radio frequency energy, and if not installed and used
in accordance with the instructions Manual, may
cause interference with radio communication. It has
been tested and found to comply with the limits for a
Class A computing device pursuant to Subpart J of
Part 15 of FCC rules, which are designed to provide
reasonable protection against such interference when
operated in a commercial environment. Operation of
this equipment in a residential area is likely to cause
interference, in which case, users at their own
expense will be required to take whatever measures
may be required to correct the interference. Any
unauthorized modification of this equipment may
result in the revocation of the owner’s authority to
continue its operation.
Humidity
Install the 7885A where the relative humidity never reaches
the saturation point.The 7885A 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 7885A where it could be subjected to
excessive vibration, 0.5G continuous maximum.
MICROCOMPUTER
RESET
PUSH-
BUTTON
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 VOLTAGE INPUTS
FIELD WIRING
INTERNAL WIRING
IGNITION
PILOT
MAIN VALVE(S)
1K
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
LIMITS
1K1 2K1
FLAME SIGNAL
TEST
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
RS485
123
L1
(HOT) L2
3
6
2K2
4K1
10
8
9
4K
5K
3K
2K
F
G
22
1
ALARM
3K1
4
L2
1
M11184
CD
AB
S445A
STOP
START
4562
R4155A
100 VAC, RM7885
200 VAC, EC7885
Weather
The 7885A is not designed to be weather tight. If installed
outdoors, the 7885A must be protected by an approved
weather-tight enclosure.
Mounting Wiring Subbase
NOTE: For installation dimensions, see Fig. 1 or 2.
1. Mount the subbase in any position except horizontally
with the bifurcated contacts pointing down.The
standard vertical position is recommended.Any other
position decreases the maximum ambient temperature
rating.
2. Select a location on a wall, burner or electrical panel.
The Q7800 can be mounted directly in the control
cabinet. Be sure to allow adequate clearance for
servicing, installation, access and removal of the
7885A, Dust Cover, flame amplifier, flame amplifier
signal voltage probes, electrical signal voltage probes
and electrical field connections.
3. For surface mounting, use the back of the subbase as a
template to mark the four screw locations. Drill the pilot
holes.
4. Securely mount the subbase using four no.6 screws.
Refer to Fig. 7 for proper subbase wiring. Figures 8, 9, 10 and
11 show optional connections for the 7885A.
Fig. 6. 7885A Internal block diagram. (See Fig. 7 for detailed wiring instructions.)

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
11
Fig. 7. 7885 wiring.
M11185
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
MAIN FUEL
VALVE(S)
INTERMITTENT
PILOT
FOR DIRECT SPARK IGNITION
(OIL OR GAS)
ALARM
LIMITS
L1
(HOT)
L2
1
MAIN VALVE
Q7800
2
L2
4
CD
A
B
S445A
START-STOP
STATION
STOP
START
DPST ALARM
SILENCING
SWITCH
INTERNAL
JUMPER
100V, 50 OR 60 HZ. (RM7885); 200V, 50 OR 60 HZ (EC7885) POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
100V ALARM (RM7885); 200V ALARM (EC7885).
1
2
3
3
8
9

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203 12
Fig. 8. High-low or modulating burner diagram.
Fig. 8 shows the use of a high-low or modulating motor with
the 7885A. 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 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.
M11179
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
INTERMITTENT
PILOT
100V, 50 OR 60 HZ. (RM7885); 200V, 50 OR 60 HZ (EC7885) POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
100V ALARM (RM7885); 200V ALARM (EC7885).
ALARM
L1
(HOT)
L2
Q7800
4
1
2
3
32
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

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
13
Fig. 9 shows 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 are ignited and
proved, and the respective 7885A flame relays pulled in.
Failure of any of the pilots to ignite prevents the main gas
valve from being energized.
Fig. 9. Cascading two or more burners or supervising two or more pilots when required for safe ignition of one burner.
M11181
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
100V, 50 OR 60 HZ. (RM7885); 200V, 50 OR 60 HZ (EC7885) POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
100V ALARM (RM7885); 200V ALARM (EC7885).
ALARM
L1
(HOT)
L2
Q7800
4
1
2
3
32
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
ALARM
Q7800
4
32
LIMITS
STOP
S445A
START-STOP
STATION
START
BA
DC
INTERNAL
JUMPER
DPST ALARM
SILENCING
SWITCH
INTERMITTENT
PILOT
MAIN FUEL
VALVE(S)

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203 14
Fig. 10. Dual fuel with high-low or modulating burner.
Fig. 10 shows typical connections for a combination gas-oil
application using high-low or modulating valves on both fuel
systems, and pilot ignition on both cycles. With the motor
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.
M11180
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
100V, 50 OR 60 HZ. (RM7885); 200V, 50 OR 60 HZ (EC7885) POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
100V ALARM (RM7885); 200V ALARM (EC7885).
ALARM
L1
(HOT)
L2
Q7800
4
1
2
3
3
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

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
15
Fig. 11. 7885A wiring with R4155 alarm silencing relay.
5. Recommended grounding practices:
a. Use the earth ground to provide 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 in event of an internal short circuit.The
7885A requires a low impedance ground
connection 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 held together with
fasteners, are free of nonconductive coatings
and have protected against corrosion on mating
surfaces.
1. For proper wiring of optional Keyboard Display Module
mounted remotely, DATA CONTROLBUS MODULE™,
Remote Reset Module or Communication Interface
Base Unit, refer to Specifications, forms 65-0090, 65-
0091, 65-0095 or 63-2278, respectively.
2. Disconnect the power supply from the main disconnect
before beginning installation to prevent electrical shock
and equipment damage.More than one disconnect may
be involved.
3. All wiring must comply with all appropriate electrical
codes, ordinances and regulations.Wiring, where
required, must comply with NEC Class 1 (Line Voltage)
wiring.
4. Recommended wire size and type: use no. 14, 16, or 18
copper conductor wire (TTW60C or THW75C or
THHN90C), 600 volt insulation wire for all line voltage
terminals. For high temperature installations, use wire
selected for a temperature rating above the maximum
operating temperature. All leadwires must be moisture
resistant.
M11178
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
MAIN FUEL
VALVE(S)
INTERMITTENT
PILOT
100V, 50 OR 60 HZ. (RM7885); 200V, 50 OR 60 HZ (EC7885) POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
100V ALARM (RM7885); 200V ALARM (EC7885).
FOR DIRECT SPARK IGNITION
(OIL OR GAS)
ALARM
L1
(HOT)
L2
9
8MAIN VALVE
Q7800
L2
4
1
2
3
3
2
1
LIMITS
STOP
S445A
START-STOP
STATION
START
BA
DC
INTERNAL
JUMPER

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203 16
b. Ground the earth ground terminal for each 7885A
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 but
wide straps or brackets are preferred rather than
leadwires.
6. Recommended wire routing for flame detector
leadwires:
1. Do not run high voltage ignition transformer wires
in the same conduit with the flame detection
wiring.
2. Do not route scanner wires in a conduit with line
voltage circuits.
3. Enclose scanner wires without armor cable in
metal cable or conduit.
4. Follow directions given in the flame detector
Instructions.
7. Maximum wire lengths:
a. For the 7885A, the maximum length of leadwire
to the terminal inputs (Control) is 300 feet.
b. For the Flame Detector leadwires, the maximum
flame sensor leadwire length is limited by the
flame signal strength.
8. Make sure loads do not exceed the terminal ratings.
Refer to the label on the 7885A or to the ratings of the
applicable Specification, seeTable 1.
9. Check the power supply circuit.The voltage and
frequency tolerance must match those of the 7885A.
Do not connect the 7885A to a power supply circuit that
can have line voltage variations such as on-off
switching of heavy loads. A separate power supply
circuit may be required for the 7885A with the required
disconnect means and overload protection added.
10. Check all wiring circuits and complete Static Checkout,
Table 4, before installing the 7885A on the subbase.
11. Install all electrical connectors.
12. Restore power to the panel.
ASSEMBLY
Mounting 7885A
NOTE: For installation dimensions, see Fig. 1 or 2.
Relay Module Mounting
1. Mount the 7885A vertically, see Fig.12 or 13, or mount
horizontally with the knife blade terminals pointing
downward. When mounted on the Q7800A, the 7885A
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 7885A, Dust Cover, flame amplifier,
flame amplifier signal voltage probes, electrical signal
voltage probes and electrical connections.
a. Allow an additional two inches below the 7885A
for the flame amplifier mounting.
b. Allow an optional three inches minimum to both
sides of the 7885A for electrical signal voltage
probes.
3. Make sure no subbase wiring is projecting beyond the
terminal blocks. Tuck in wiring against the back of the
subbase so it does not interfere with the knife blade
terminals or bifurcated contacts.
4. Mount the 7885A by aligning the four L shaped corner
guides and knife blade terminals with the bifurcated
contacts on the wiring subbase and securely tightening
the two screws without deforming the plastic.
IMPORTANT
Install the 7885A with a plug-in action rather than a
hinge action.
Fig. 12. Electrical panel installation.

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
17
Mounting Dust Cover
1. Align the two interlocking ears of the Dust Cover with
the two mating slots on the 7885A, see Fig.14.
2. Insert the two interlocking ears into the two mating slots
and, with a hinge action, push on the upper corners of
the Dust Cover to secure it to the 7885A.
3. Be sure the Dust Cover is firmly in place.
Fig. 13.Wall or Burner Installation
Installing Plug-in Flame Signal Amplifier
1. Disconnect the power supply before beginning
installation 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 7885A.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 7885A retaining clasp.
4. Verify the amplifier is firmly in place.
5. Perform all required checkout tests.
Fig. 14. Dust Cover mounting.
Installing The Flame Detector
NOTE: Table 2 and Fig.16 list the flame detection systems
available for use with the 7885A. Make sure the
correct combination of amplifier and flame
detector(s) is used.
Proper flame detector installation is the basis of a safe and
reliable flame safeguard installation. Refer to the Instructions
packed with the flame detector and the equipment
manufacturer instructions.
Keep the flame signal leadwires as short as possible from the
flame detector to the wiring subbase. Capacitance increases
with leadwire length, reducing the signal strength.The
maximum 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, seeTable 5.
Fig. 15. Flame Signal Amplifier Mounting.

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203 18
Fig. 16. Flame detector wiring.
BLUE
YELLOW
WHITE
WHITE
WHITE
WHITE
BLACK
BLACK
F
G
22
L2
L1
L2
M11131B
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
BLUE
YELLOW
F
G
SOLID STATE SELF-CHECKING
ULTRAVIOLET (C7061A)
2
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
1CAUTION: FLAME 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.
CAUTION: 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.
WHEN USING A C7061A OR 200V VERSION OF THE C7012E,F OR C7076A, A 2:1 STEP DOWN TRANSFORMER IS
REQUIRED. SEE FIGURE 8.
ON EC7800 SERIES RELAY MODULE APPLICATIONS ONLY; 200,220, 240 VAC TO 120 VAC, 10 VA MINIMUM STEPDOWN
TRANSFORMER (NOT PROVIDED) MUST BE INSTALLED TO DRIVE THE SHUTTER. FAILURE TO INSTALL A STEPDOWN
TRANSFORMER WILL DAMAGE THE SHUTTER MECHANISM.
2
3
3
3
3
22
N
4
4
4

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
19
OPERATION
Sequence of Operation
The operating sequence for the 7885A follows, see Figs.17,
18, and Table 3.
NOTE: The alarm will sound until a flame is sensed.
Initiate
The 7885A enters the INITIATE sequence when the Relay
Module is powered.The 7885A can also enter the INITIATE
sequence when the Relay Module verifies voltage fluctuations
of +10/-15% or frequency fluctuations of +/-10% during start-
up or run sequences.The INITIATE sequence lasts for ten
seconds unless the voltage or frequency tolerances are not
met. When the tolerances are not met, a hold condition is
initiated and is displayed on the optional VFD for at least five
seconds.When the tolerances are met, the INITIATE
sequence restarts. If the condition is not corrected and the
hold condition exists for four minutes, the 7885A locks out.
Causes for hold conditions in the 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.
Standby
The 7885A will be in the STANDBY mode after it has
completed the INITIATE startup or the Stop Switch has been
pressed.The POWER LED will blink every four seconds,
signifying an internal hardware check has been completed.
The ALARM LED will also be lit and an external alarm will be
activated.
Normal Start-Up
When the Start Switch is pressed, the Ignition Transformer is
energized and power is applied to terminal 10 of the 7885A. If
all microcomputer monitored circuits are in the correct state,
the 7885 will initiate a Safe-Start Check and Ignition Trials.
Safe Start Check (Two Seconds)
The 7885A 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 7885 will
provide power to the Intermittent Pilot Valve, terminal 8 and
turn on the PILOT LED.
When flame is proven, the FLAME LED lights, the ALARM
LED shuts off and the RM7885 brings on the Main Valve and
turn on the MAIN LED.
The Start Switch can now be released, which shuts off the
Ignition Transformer.
NOTE: THE PILOT VALVE Follows the Start Switch until the
flame is proven.Then it is in control of the 7885 (for
example, pushing and releasing the Start Switch
brings on and shuts off the Ignition Transformer and
the Pilot Valve until the flame is proven.)
Run
The 7885A is now in RUN and remains in RUN until the Stop
Switch is pressed or a Limit opens terminal 6.
INITIATE
POWER
PILOT
FLAME
MAIN
ALARM ALARM ALARM
STANDBY
POWER POWER
PILOT
FLAME
MAIN
RUN STANDBY
BURNER
START
START SWITCH
MAIN VALVE
LIMITS, STOP STATION AND ALARM SLICENING SWITCH CLOSED
INTERMITTENT PILOT
SAFE START CHECK FLAME PROVING
LED
DISPLAY POWER
PILOT
FLAME
MAIN
PFEP
POWER
SAFE-
START
POWERPOWER
LIMITS, STOP
STATION AND
SILENCING SWITCH
FLAME
SIGNAL
1
1
7885
MAIN FUEL VALVE IS ENERGIZED DURING PFEP IF FLAME IS PROVEN. M11183
00 00 15 MINUTES
L1 TO 6
9
8
10
Fig. 17. 7885 sequence.

7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203 20
Fig. 18. Sequence status LEDs.
Table 3. LED sequence status display information.
SEQUENCE
STATUS
LEDs
RESET
PUSHBUTTON
CAPTIVE
MOUNTING
SCREW
DUST
COVER
RELAY
MODULE
FLAME
AMPLIFIER
M11177
Burner Sequence LEDs Energized
INITIATE POWER, PILOT, FLAME, MAIN and ALARM
STANDBY POWER, PILOT, FLAME, MAIN and ALARM
STANDBY HOLD: F/G (Flame Detected) POWER, PILOT, FLAME, MAIN and ALARM
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.
Static Checkout
CAUTION
1. Use extreme care while testing the system. Line
voltage is 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 7885A 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
properly.
NOTE: Do not perform a dielectric test with the 7885A
installed. Internal surge protectors will break down
and conduct a current.This could cause the 7885A
to fail the dielectric test or possibly destroy the
internal lightning and high current transient
protection components.
Equipment Required
1. Voltmeter (1M ohm/volt minimum sensitivity) set on the
0-300Vac 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 this section,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
theTest Jumpers column ofTable 4.
4. Close the master switch before observing operation.
5. Read the voltage between the subbase wiring terminals
listed in the Voltmeter column of Table 4.
6. If there is no voltage or the operation is abnormal,
check the circuits and external devices as described in
the last column.
7. Check all wiring for correct connections, tight terminal
screws, correct wire, and proper wiring techniques.
Replace all damaged or incorrectly sized wires.
8. Replace faulty controllers, limits, interlocks, actuators,
valves, transformers, motors and other devices as
required.
9. Obtain normal operation for each required test before
continuing the checkout.
10. After completing each test, be sure to remove the test
jumper(s).