Honeywell R7849B Thermostat User Manual

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R7824, R7847, R7848, R7849,R7851,R7861,  
R7886 Amplifiers for  
7
800 SERIES Relay Modules  
PRODUCT DATA  
The R7851C Dynamic Self-Check Optical Flame Amplifier is a  
solid state plug-in amplifier that responds to ultraviolet signals  
from C7961E Dynamic Shutter-Check ultraviolet flame detectors  
to indicate the presence of flame when used with 7800 SERIES  
Relay Modules.  
The R7861A Self-Check Ultraviolet Flame Amplifier is a solid  
state plug-in amplifier that responds to an ultraviolet signal from a  
C7061 Self-Check Ultraviolet Flame Detector to indicate the  
presence of flame when used with 7800 SERIES Relay Modules.  
The R7886A Dynamic Self-Check Ultraviolet Amplifier is a solid  
state plug-in amplifier that responds to a pulsed direct current  
signal from a C7076A,C Ultraviolet Flame Detector with  
adjustable sensitivity to indicate the presence of flame when used  
with 7800 SERIES Relay Modules.  
FEATURES  
•
Flame failure response time of 0.8 or 1 second; or 2.0 or  
3.0 seconds, depending on the amplifier and relay module  
selected. See Table 1.  
•
•
Plug-in to 7800 SERIES Relay Module through printed  
circuit board edge connector keyed for proper orientation.  
Flame signal test jacks measure amplifier flame signal  
voltage.  
APPLICATION  
The R7824C Rectification Flame Amplifier is a solid state plug-in  
amplifier that responds to a rectified signal from a C7024E,F Self-  
Check Ultraviolet Flame Detector to indicate the presence of  
flame when used with an RM7824 Relay Module.  
•
•
0.0 to 5.0 Vdc Flame signal strength reading range.  
Color coded label identifies flame detection type:  
—
—
—
Green—rectification. Red—infrared.  
Purple—ultraviolet. Blue—pulsed rectification.  
White—optical.  
The R7847A,B Rectification Flame Amplifiers are solid state plug-  
in amplifiers that respond to a rectified signal from a rectification  
type flame detector to indicate the presence of flame when used  
with 7800 SERIES Relay Modules.  
•
•
R7847B, R7848B, R7849B Dynamic Ampli-Check®  
circuitry tests all flame amplifier components 12 times per  
minute. The 7800 SERIES Relay Module locks out on  
safety shutdown with amplifier failure.  
The R7847C Self-Check Rectification Flame Amplifier is a solid  
state plug-in amplifier that responds to a rectified signal from a  
C7012E,F Self-Check Ultraviolet Flame Detector to indicate the  
presence of flame when used with 7800 SERIES Relay Modules.  
This is not European Community (CE) approved for EC7810,  
EC7820, EC/RM7830 or EC/RM7850 Relay Modules.  
R7824C and R7847C Dynamic Self-Check Rectification  
Amplifier, R7851C Dynamic Self-Check Optical Flame  
Amplifier, R7861 Self-Check Ultraviolet Flame Amplifier  
and R7886A Dynamic Self-Check Ultraviolet Amplifier test  
the detectors and all electronic components in the flame  
detection system 12 times per minute. The 7800 SERIES  
Relay Module locks out on safety shutdown with flame  
detection system failure.  
The R7848A,B Infrared Flame Amplifiers are solid state plug-in  
amplifiers that respond to an infrared signal from a C7015  
Infrared Flame Detector to indicate the presence of flame when  
used with 7800 SERIES Relay Modules.  
NOTE: NOTE:R7824C, Series 2 or greater, and R7847C,  
Series 4 or greater, pulse shutter when signal of  
1
.5 Vac is sensed.  
The R7849A,B Ultraviolet Flame Amplifiers are solid state plug-in  
amplifiers that respond to an ultraviolet signal from a C7027,  
C7035 or C7044 Ultraviolet Flame Detector to indicate the  
presence of flame when used with 7800 SERIES Relay Modules.  
Contents  
Application ........................................................................  
Features ...........................................................................  
Specifications ...................................................................  
Ordering Information .........................................................  
Installation ........................................................................  
Checkout ..........................................................................  
1
1
2
2
4
6
The R7851B Optical Flame Amplifiers are solid state plug-in  
amplifiers that respond to optical signals from C7927, C7935,  
C7915, and C7962 Flame Detectors to indicate the presence of  
flame when used with 7800 SERIES Relay Modules.  
®
U.S. Registered Trademark  
Copyright © 2002 Honeywell • All Rights Reserved  
65- 0109- 8  
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R7824, R7847, R7848, R7849,R7851,R7861, R7886 AMPLIFIERS FOR 7800 SERIES RELAY MODULES  
SPECIFICATIONS  
Models:  
Factory Mutual Approved: Report J.I.1V9A0.AF. (R7851C  
Pending.)  
Flame Detection Systems (see Table 2):  
Rectification:  
Industrial Risk Insurers: Acceptable  
R7824C for use with C7024E,F Solid State Ultraviolet  
Detectors.  
Table 1. Relay Module Flame Failure  
Response Time (FFRT).  
R7847A for use with flame rods, rectifying photocells or  
C7012A,C Solid State Ultraviolet Detectors.  
R7847B for use with flame rods, rectifying photocells or  
C7012A,C Solid State Ultraviolet Detectors.  
R7847C for use with C7012E,F Solid State  
Ultraviolet Detectors.  
Flame Failure Response  
Time (FFRT) in seconds  
Relay Module  
0.8 or 1 2.0 or 3.0  
2.0  
Infrared:  
EC7810, EC7820, EC/RM7830, 1.0  
EC/RM7850  
R7848A for use with C7015 Infrared (lead sulfide) Detector.  
R7848B for use with C7015 Infrared (lead sulfide) Detector.  
Ultraviolet:  
EC/RM7823, EC/RM7885, EC/ 0.8  
RM7890, EC/RM7895, RM7896,  
RM7888, RM7838, RM7800,  
RM7840  
3.0  
R7849A for use with C7027/C7035/C7044 Minipeeper Ultravi-  
olet Detectors.  
R7849B for use with C7027/C7035/C7044 Minipeeper Ultravi-  
olet Detectors.  
R7861A for use with C7061A Ultraviolet Detector.  
R7886A for use with C7076A,D Ultraviolet Detectors with  
adjustable sensitivity.  
RM7824  
N/A  
3.0  
Optical:  
R7851B for use with C7927, C7935, C7915 and C7962 Flame  
Detectors.  
S
–
+
R7851C for use with C7961E Flame Detectors.  
Flame Failure Response Time: See Table 1.  
FLAME AMPLIFIER  
Flame Signal (Volts dc):  
Minimum Acceptable: 1.25 Vdc.  
Flame Signal Voltage Range (displayed on Keyboard Display  
Module or measured with a 1M ohm/volt meter plugged into  
amplifier test jacks): 0.0 to 5.0 Vdc.  
3
(76)  
Environmental Ratings:  
Ambient Temperature:  
3/8 (9)  
Operating: -40°F to 140°F (-40°C to 60°C).  
Storage: -40°F to 150°F (-40°C to 65°C).  
Humidity: Operating 85% rh continuous, noncondensing.  
Vibration: Continuous 0.5G environment.  
7/8  
3-9/16 (91)  
(23)  
M11460  
Weight: 2.5 oz (71g), unpacked.  
Dimensions: See Fig. 1  
Fig. 1. Flame amplifier dimensions in in. (mm).  
Approvals:  
NOTE: .NOTE: EN298 Approved: When these amplifiers are  
used with an EC7810, EC7820, EC/RM7830, or  
EC/RM7850 Relay Module.  
Underwriters Laboratories Inc. Listed: File no. MP268, Guide no.  
MCCZZ: R7847A, R7847B, R7847C, R7861A, R7886A,  
R7848A, R7848B, R7849A, R7849B, R7851B. (R7851C  
Pending.)  
Accessories:  
Underwriters Laboratories Inc. Component Recognized: File no.  
MP268, Guide no. MCCZZ: R7824C.  
Flame Simulators:  
Rectification: 123514A.  
Canadian Standards Association Certified: LR95329-3. (R7851C  
Pending.)  
Ultraviolet: 203659.  
Flame Detectors (ordered separately): select from Table 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).  
Home and Building Control Customer Relations  
2
Honeywell, 1885 Douglas Drive North  
Minneapolis, Minnesota 55422-4386  
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.  
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.  
6
5-0109—8  
2
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R7824, R7847, R7848, R7849,R7851,R7861, R7886 AMPLIFIERS FOR 7800 SERIES RELAY MODULES  
Table 2. Flame Detection Systems.  
Plug-in Flame Signal Amplifiers  
Applicable Flame Detectors  
Flame  
Failure  
Response  
a
Type  
Color Self-Checking  
Model  
Time (sec)  
Fuel  
Type  
Models  
C7024E,F  
Rectification Green Dymanic Self-  
Check  
b,c, i 3  
Gas, oil, Ultraviolet (Purple  
coal Peeper®)  
R7824C  
No  
R7847Ah  
0.8/1 or 2/3 Gas  
Rectifying Flame Rod C7004, C7007, C7011  
j
Complete Assemblies:  
C7008, C7009, Q179  
Holders  
Rectifying Photocell  
Gas, oil, Ultraviolet (Purple  
No  
No  
R7847Ah  
0.8/1 or  
/3  
Oil  
C7003, C7010, C7013,  
2
d
C7014  
R7847Ah  
2/3  
C7012A,C.  
coal  
Peeper®)  
Dynamic Ampli-  
Check®  
R7847Be,h  
0.8/1 or  
2/3  
Gas  
Rectifying Flame Rod C7004, C7007, C7011  
b
Complete Assemblies:  
C7008, C7009, Q179  
Holders  
Rectifying Photocell  
Dynamic Ampli-  
Check®  
R7847Be,h  
0.8/1 or  
2/3  
Oil  
C7003, C7010, C7013,  
d
C7014  
Dynamic Ampli-  
Check®  
R7847Be,h  
R7847Cc,f, i  
2/3  
Gas, oil, Ultraviolet (Purple  
coal Peeper®)  
C7012A,C  
Dynamic Self-  
Check  
2/3  
Gas, oil, Ultraviolet (Purple  
coal Peeper®)  
C7012E,F  
Infrared  
Red  
No  
R7848A  
2/3  
Gas, oil, Infrared (Lead  
coal Sulfide)  
C7015  
Dynamic Ampli-  
Check®  
R7848Be  
3
Gas, oil, Infrared (Lead  
coal Sulfide)  
C7015  
Ultraviolet Purple No  
R7849A  
0.8/1 or  
Gas, oil Ultraviolet  
(Minipeeper)  
C7027, C7035, C7044g  
C7027, C7035, C7044g  
2
/3  
Dynamic Ampli-  
Check®  
R7849Bd  
R7861Ac,f  
R7886Ac,f  
0.8/1 or  
2/3  
Gas, oil Ultraviolet  
(Minipeeper)  
Dynamic Self-  
Check  
0.8/1 or  
2/3  
Gas, oil, Ultraviolet  
coal  
C7061  
Blue  
Dynamic Self-  
Check  
2/3  
Gas, oil, Ultraviolet (Adjustable C7076  
coal Sensitivity)  
Optical  
White Dymanic Ampli- R7851B  
Check®  
0.8/1 or 2/3 Gas, oil, Optical (UV, IR,  
coal Visible Light)  
C7927, C7935, C7915,  
C7962  
Dynamic Self-  
Check  
R7851Cc  
2/3  
Gas, oil, Optical (UV only)  
coal  
C7961  
a
Flame Failure Response Time (FFRT) depends on selection of amplifier and 7800 SERIES Relay Module.  
R7824C is used only with the 24 Vdc RM7824 Relay Module and C7024E,F Flame Detectors.  
Circuitry tests all electronic components in flame detection system (amplifier and detector) 12 times a minute during burner operation  
and shuts down burner if detection system fails.  
Use only Honeywell part no. 38316 Photocell.  
Circuitry tests flame signal amplifier 12 times a minute during burner operation and shuts down burner if amplifier fails.  
b
c
d
e
f
2
00/220/240 Vac applications require a 120 Vac, 10 VA minimum stepdown transformer (not provided) to drive the shutter. Applies to  
R7847C series 3 or greater; R7886A series 2 or greater; R7861 series 1 or greater. Fig. 2 shows flame detector wiring.  
g
Use C7027, C7035 and C7044 Flame Detectors only on burners that cycle on-off at least once every twenty-four hours. Use C7012E,F  
Flame Detector with R7847C Amplifier, C7061A Ultraviolet Detector with R7861A Amplifier or C7076A Flame Detector with R7886A  
Amplifier as ultraviolet flame detection system for appliances with burners that remain on continuously for twenty-four hours or longer.  
R7847A,B Amplifiers with 0.8/1 second FFRT should not be used with C7012A,C Solid State Ultraviolet Detectors.  
R7824C Series 2 and greater and R7847C Series 4 and greater check flame detector system when flame reaches 1.5 Vdc or at 4.5  
seconds, whichever occurs first.  
h
i
j
Order flame rod separately; see flame detector Instructions for holder.  
3
65-0109—8  
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R7824, R7847, R7848, R7849,R7851,R7861, R7886 AMPLIFIERS FOR 7800 SERIES RELAY MODULES  
1
2
.
.
Align the amplifier circuit board edge connector with the  
keyed receptacle on the 7800 SERIES Relay Module.  
Be sure the amplifier nameplate faces away from the  
Relay Module.  
CAUTION  
Equipment Damage Hazard.  
Incorrect combination of relay module, amplifier  
and flame detector can cause equipment damage.  
In infrared applications (C7015 Infrared Flame  
Detector and R7848 Amplifier) using the RM7890  
Relay Module with software version 4004 or less  
requires a ten-second delay to start sequence. This  
applies only to the initial power of the RM7890.  
Push in the amplifier until the circuit board is fully  
inserted into the receptacle and then push the amplifier  
toward the 7800 SERIES Relay Module retaining clasp.  
Be sure the amplifier is firmly in place.  
3
4
.
.
Perform all required checkout tests.  
Installing Flame Detector  
INSTALLATION  
NOTE: NOTE:Table 2 lists flame detection systems available  
for use with 7800 SERIES Relay Modules. Be sure to  
use the correct combination of amplifier and flame  
detector.  
When Installing this Product...  
1
2
.
.
Read these instructions carefully. Failure to follow them  
could damage the product or cause a hazardous  
condition.  
Check the ratings given in the instructions and on the  
product to make sure the product is suitable for your  
application.  
Installer must be a trained, experienced, flame  
safeguard control technician.  
After installation is complete, check out the product  
operation as provided in these instructions.  
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 manufac-  
turer 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. However, the ultimate  
limiting factor for the flame detector leadwire is the flame  
signal; see Table 3 in the Checkout section.  
3
4
.
.
WARNING  
Electric Shock Hazard.  
Can cause electrical shock, serious injury or  
death.  
Disconnect the power supply before beginning  
installation. More than one power supply  
disconnection can be involved.  
IMPORTANT  
1
2
3
. Wiring must comply with all applicable codes,  
ordinances and regulations  
. Wiring (where required) must comply with NEC  
Class 1 (Line Voltage) wiring.  
. Perform all required checkout tests after installation  
is complete.  
CAUTION  
Equipment Damage Hazard.  
Can cause equipment damage.  
Disconnect 7800 SERIES Relay Module power before  
removing amplifier.  
Fig. 2. Installing flame signal amplifier.  
Wiring  
Installing Plug-In Flame  
Signal Amplifier (Fig. 2)  
WARNING  
Electrical Shock Hazard.  
Can cause electrical shock or equipment damage.  
Disconnect power supply before beginning installation.  
More than one disconnection can be involved.  
WARNING  
Can cause electrical shock, serious injury or  
death.  
Disconnect the power supply before beginning  
installation. More than one power supply  
disconnection can be involved.  
Electric Shock Hazard.  
1. Remove the 7800 SERIES Relay Module from the  
wiring subbase.  
2. Refer to Fig. 3 for proper flame detector wiring.  
6
5-0109—8  
4
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R7824, R7847, R7848, R7849,R7851,R7861, R7886 AMPLIFIERS FOR 7800 SERIES RELAY MODULES  
PHOTOCELL  
FLAME ROD  
C7076A,D ULTRAVIOLET DETECTOR  
X F  
X G  
X F  
REMOTE  
SENSOR  
X G  
6
5
4
3
F
7
8
EARTH  
GROUND  
3a  
3b  
2b  
G
2
a
INFRARED (C7015)  
SHUTTER  
SHUTTER  
L1  
1
C7076A  
OR  
C7076D  
TERMINAL  
BLOCK  
WHITE  
F
L2  
2
BROWN  
G
L1 (HOT)  
3
ULTRAVIOLET (C7027/C7035/C7044)  
L2 (COMMON)  
BLUE  
F
7800 SERIES  
1
WHITE  
G
F
G
L2  
5
22  
OPTICAL C7927A  
F
BLUE  
SOLID STATE SELF-CHECKING  
ULTRAVIOLET (C7012E,F)  
1
WHITE  
G
SOLID STATE  
ULTRAVIOLET (C7012A,C, C7961E) 4  
BLUE  
F
2
YELLOW  
WHITE  
G
22  
3
WHITE  
BLACK  
BLACK  
L2  
L1  
L2  
BLUE  
F
2
G
YELLOW  
BLACK  
L1  
L2 BLACK  
GND GREEN  
5
SOLID STATE SELF-CHECKING  
ULTRAVIOLET (C7024E,F – E SHOWN)  
SOLID STATE SELF-CHECKING  
ULTRAVIOLET (C7061A)  
BLUE  
F
G
22  
BLUE  
2
YELLOW  
WHITE  
F
2
YELLOW  
G
3
L2 WHITE  
RED  
L2 BLACK  
WHITE  
2
2
3
WHITE  
N
1
!
CAUTION: EQUIPMENT DAMAGE HAZARD. INCORRECT WIRING POLARITY CAN DAMAGE OR DESTROY UV SENSING TUBES.  
CONNECT FLAME DETECTOR WIRES ACCORDING TO FOOTNOTES 1 AND 2 TO PREVENT UV SENSING TUBE DAMAGE.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.  
2
3
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.  
!
CAUTION: EQUIPMENT DAMAGE HAZARD. INCORRECT VOLTAGE CAN DAMAGE SHUTTER MECHANISM ONLY ON EC7800 SERIES  
RELAY MODULES. INSTALL A 200/220/240 VAC TO 120 VAC, 10VA MINIMUM, STEPDOWN TRANSFORMER (NOT PROVIDED) TO DRIVE  
THE SHUTTER MECHANISM.  
4
5
DO NOT USE 0.8/1 SECOND FFRT AMPLIFIER WITH C7012A,C FLAME DETECTOR.  
GND (GREEN) LEAD WIRE ON C7961E ONLY.  
M20309  
Fig. 3. Flame detector wiring.  
5
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R7824, R7847, R7848, R7849,R7851,R7861, R7886 AMPLIFIERS FOR 7800 SERIES RELAY MODULES  
3
4
.
.
Disconnect power supply before making wiring  
connections to prevent electrical shock and equipment  
damage.  
All wiring must comply with appropriate electrical codes,  
ordinances and regulations including NEC Class 1 (Line  
Voltage) wiring where required.  
Use recommended wire size and type no. 18 copper  
conductors TTW(60C) or THW (75C) or THNN(90C).  
Use recommended wire routing:  
a. Keep the flame signal leadwire as short as possible  
from the detector to the 7800 SERIES Relay Module.  
The maximum permissible leadwire length depends  
on the type of leadwire, conduit type and leadwire  
diameter. The ultimate limiting factor for flame signal  
leadwire length is the flame signal voltage.  
CAUTION  
Equipment Damage Hazard.  
Improper wiring can destroy ultraviolet sensing  
tube.  
Carefully follow polarity sensitive wiring instructions for  
the C7027, C7035, C7044, C7012, C7024, C7061,  
C7961 and C7076. Reversing the leadwires, even  
momentarily, can destroy the ultraviolet sensing tube.  
5
6
.
.
POSITIVE (+)  
METER LEAD  
NEGATIVE (-)  
METER LEAD  
ONE  
MEGOHM/VOLT  
METER  
b. Do not run high voltage ignition transformer wires in  
the same conduit with the flame detection wiring.  
c. If the flame detector leadwires are not long enough  
to reach the 7800 SERIES Relay Module electrical  
connectors, make splices in a junction box.  
FLAME SIMULATOR  
TEST JACK  
(
1) Enclose scanner wiring without armor cable in  
metal cable or conduit.  
(
2) Follow flame detector Instructions.  
7
8
9
.
.
.
Check wiring, see Fig. 4.  
Install 7800 SERIES Relay Module.  
Restore power to the 7800 SERIES Relay Module.  
Flame detector wiring is shown in Fig. 3.  
CHECKOUT  
M11459A  
Fig. 4. Flame signal measurement with meter.  
Preliminary Inspection  
Make certain that:  
1. Connect blue leadwire from detector to terminal F and  
white leadwire from C7027/C7035/C7044/C7061 to  
terminal G.  
2. Connect blue leadwire from detector to terminal F and  
yellow leadwire from C7012/C7024/C7961 to terminal  
G.  
3. Follow lightoff Instructions for applicable 7800 SERIES  
Relay Module.  
1
.
Wiring connections are correct and all terminal screws  
and electrical connections are tight.  
Proper flame failure response time is selected.  
Amplifier is securely mounted on the 7800 SERIES  
Relay Module.  
2
3
.
.
4
5
.
.
Detectors are properly positioned and cleaned  
according to Detector Instructions.  
Correct combination of amplifier and flame detector is  
used.  
Measuring Flame Signal With Keyboard  
Display Module  
Flame Signal Measurement (Fig. 4)  
Consult Instructions for applicable 7800 SERIES Relay  
Module or Keyboard Display Module.  
Flame signal can be measured at the Flame Signal Test  
Jacks, see Fig. 4, and at the Keyboard Display Module.  
Measure the flame signal at the appropriate times defined in  
the Checkout section; see applicable 7800 SERIES Relay  
Module Instructions. See Table 3 for acceptable and  
maximum flame signal voltage strengths.  
Measuring Flame Signal with a Volt  
Ohmmeter  
Two test jacks, positive and negative (Com) are accessible on  
the top of the amplifier when plugged into the 7800 SERIES  
Relay Module. These jacks are provided for monitoring flame  
signal strength. Use a one megohm/volt meter to measure the  
flame signal strength. Connect the positive meter lead (red) to  
the positive (+) amplifier test jack and the negative meter lead  
(
black) to the negative (-) amplifier test jack. The test jacks  
use standard 0.180 inch diameter voltmeter probes. A  
minimum 1.25 Vdc flame signal is required.  
6
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Table 3. Flame signal.  
Minimum Acceptable  
a
Flame Detector  
Flame Signal Amplifier  
Steady dc Voltage  
Maximum Expected dc Voltage  
Flame Rod Photocell  
R7847A,Bb  
1.25 Vdc  
5.0 Vdc at Keyboard Display Module  
or on volt-ohmmeter.  
C7012A,Cc  
C7012E,Fc  
C7015A  
R7847Cd,e  
R7848A,Bb  
C7024E,F  
R7824Cd,e  
R7849A,Bb  
C7027A  
C7035A  
C7044A  
C7927  
C7935  
C7915  
C7962  
R7851Bb  
C7061A  
C7076A,D  
C7961E  
R7861Ad  
R7886Ad  
R7851Cd  
a
This minimum or stronger signal can be easily obtained if the detector is correctly installed and positioned to properly sense the  
flame. Obtain this voltage before completing checkout.  
The flame amplifiers are Ampli-Check® type.  
Adjust slightly, or face the pipe down, or extend the sight pipe on C7012A,C,E,F applications to obtain a maximum flame signal  
reading less than 5.0 volts.  
The flame signal amplifier circuitry is tested one-half second every five seconds during burner operation and shuts down the  
burner if the amplifier fails (all installations).  
b
c
d
e
R7824C, Series 2 or greater, and R7847C, Series 4 or greater, pulse the shutter when the flame signal reaches 1.5 Vdc.  
The flame signal for the pilot alone, the main burner flame  
alone, and both together must be steady and a minimum of  
1.25V. If the flame signal is unsteady, or less than the  
5. With the burner running, check the temperature at the  
detector. If it exceeds the detector maximum rated  
temperature:  
minimum acceptable voltage, check the flame detector  
installation and circuitry in the following procedure.  
a. Add a heat block to stop conducted heat traveling  
up the sight pipe.  
b. Add a shield or screen to reflect radiated heat.  
c. Add cooling (refer to sight pipe ventilation in the  
detector Instructions).  
1
.
Check the supply voltages at terminals (L1) and L2 (N).  
Make sure the master switch is closed, connections are  
correct, and the power supply is of the correct voltage  
and frequency and is sinusoidal.  
6. Make sure that the flame adjustment is not too lean.  
7. Make sure the optical detector is properly sighting the  
flame.  
8. If necessary, resight or reposition the detector.  
9. If you cannot obtain proper operation, replace the  
plug-in amplifier.  
10. If you cannot yet obtain proper operation, replace the  
flame detector.  
2
.
Check the detector wiring for defects including:  
a. Incorrect connections.  
b. Wrong type of wire.  
c. Deteriorated wire.  
d. Open circuits.  
e. Short circuits.  
f. Leakage paths caused by moisture, soot or accu-  
mulated dirt.  
IMPORTANT  
3
4
.
.
For a flame rod, make sure:  
a. There is enough ground area.  
If you make any changes to the flame detection  
system, repeat all required Checkout tests in  
Checkout section of the Instructions for the  
applicable 7800 SERIES Relay Module.  
b. The flame rod is properly located in the flame.  
c. Temperature at the flame rod insulator is no greater  
than 500¡F (260¡C).  
For all optical detectors, clean the detector viewing win-  
dow, lens, and inside of the sight pipe as applicable.  
7
65-0109—8  
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