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3. If the voltage at terminals 16 and L1 are correct and

relay 3K does not pull in, replace the R7795.

B. Relay 3K pulls in but the burner motor does not start:

1. Check for power at terminal 8 when the 3K relay

pulls in.

a. If terminal 8 is not powered, replace the R7795.
b. If terminal 8 is powered, check the fan or burner

motor circuit and wiring.

C. Control locks out during prepurge:

If the flame indicator LED lights during the prepurge

period and remains lighted for six seconds or longer, the
control will lock out electrically (the device holds at the
start of prepurge with the blower energized). If the flame
on condition corrects itself after six seconds, the safety
switch will trip, causing a mechanical lockout. The line
voltage alarm (terminal 9) is energized and the burner/
blower (terminal 8) is de-energized. Check for a flame
simulating failure.

1. R7795B, D (rectification) models:

a. Disconnect flame circuit by inserting the plug end

of a meter jack or flame simulator into the flame
current jack on the front of the amplifier board. Do
not ground the other end of the plug or simulator.

b. Restart the system. If the flame indicator LED

lights, replace the R7795. If not, check the flame
detector and external flame detection circuit.
Look for light reaching the detector, hot refrac-
tory hold-in, defective wiring, or a defective
detector.

2. R7795A,C (ultraviolet) models:

a. Measure the flame current during prepurge. The

flame current should not exceed one-fourth mi-
croampere during the prepurge period.

b. If excessive flame current is present, check the

flame detector circuit for wiring problems. If no
wiring problems are found, replace the flame
detector. Recheck the flame current during
prepurge. If the excessive flame current persists,
replace the R7795.

D. Burner motor starts but prepurge does not stop at

the end of the purge timing (relay 1K does not pull in).
1. If the R7795 is an interrupted pilot model, check

that the RUN/TEST switch is in the RUN position.

2. Check the seating of the ST795A Purge Timer.
3. Check for line voltage on the airflow switch (termi-

nals 3 to L2).

4. Check the condition of the flame indicator LED. If

it is lighted, look for a flame simulating failure (see item
C above).

5. Replace the ST795A with one of the same timing. If

the problem still persists, replace the R7795.

E. Relay 1K pulls in but the pilot does not light, ignition

spark does not occur, or the pilot valve does not open.
1. Make sure that all manual fuel valves are opened.
2. Check the voltage at the pilot (or first stage oil) valve

terminal 5 and the ignition terminal 18. Check must be
made before device locks out.

3. If the voltage is zero, replace the R7795.

NOTE: If terminals 5 and/or 18 are shorted to L2, the

R7795 will be permanently damaged. This shorted con-
dition must be corrected before repowering the system.

4. If the terminals are powered, check the pilot and

ignition circuits for faulty wiring or defective devices.

F. Pilot lights but Flame Indicator LED does not come on.

1. Use the appropriate flame simulator (UV or recti-

fication) to check the Flame Indicator LED. Follow the
instructions supplied with the simulator.

2. If no simulator is available, check the flame current

as instructed on page 10. If the current is satisfactory,
replace the R7795. If the flame current is not satisfactory,
check the items listed in the Checkout section.

G. Pilot lights and Flame Indicator LED comes on but

the main burner does not light.
1. Check that the manual main fuel valves are open.
2. Check the voltage at terminal 6.

a. If the voltage is normal, check the main valve and

its external circuitry.

b. If the voltage is zero, replace the R7795.

NOTE: If any of the terminals are shorted to L2, the R7795

will be permanently damaged. This shorted condition
must be corrected before repowering the system.

H. Relay Flame Indicator LED remains on after the

flame goes out.

RECTIFICATION MODELS:

1. If the flame detector is a rectifying flame rod, install a

new R7795.

2. If the detector is a rectifying photocell or a C7012A,

plug the jack end of the flame simulator into the flame
current jack on the amplifier board.

a. If the flame indicator LED does not go out, re-

place the R7795.

b. If the flame indicator LED goes out, the trouble is

caused by hot refractory hold-in, detector failure
or other flame simulating conditions.
(1) Remove the flame simulating condition such

as false light.

(2) Resight the photocell to a cooler, more re-

mote area of the combustion chamber.

(3) Check the flame current as recommended in

the Checkout section. Replace the detector if
necessary.

(4) Check for a short or high resistance between

terminals F and G.

ULTRAVIOLET MODELS:

a. Remove any flame simulating condition such as

false light.

b. Resight the detector to a cooler, more remote area

of the combustion chamber.

c. Replace the detector if necessary.
d. Check for a short or high resistance between

terminals F and G.

R7795A,B,C,D

TROUBLESHOOTING

Содержание R7795A

Страница 1: ...odels Safe start feature prevents start up with lockout if flame or a flame simulating failure exists Recycleorlockoutonflamefailureisfieldselectable Safety switch must be manually reset after lockout Meets Underwriters Laboratories Canadian Stan dards Association and Factory Mutual Approved standards Integral solid state color coded flame amplifiers R7795A Cforultravioletdetectionsystems purple R...

Страница 2: ...dditional questions need further information or would like to comment on our products or services please write or phone 1 Your local Honeywell Home and Building Control Sales Office check white pages of phone directory 2 Home and Building Control Customer Satisfaction Honeywell Inc 1885 Douglas Drive North Minneapolis Minnesota 55422 4386 612 951 1000 In Canada Honeywell Limited Honeywell Limitée ...

Страница 3: ...tor Plug for older W136A Test Meters 123514A Flame Simulator for rectification systems 123514B Flame Simulator for ultraviolet systems Q624A Solid State Spark Generator Q795A Wiring Subbase ST795A Plug in Purge Timer models available with 1 5 7 10 30 60 and 90 second timings FSP5004A with adapter for operational check of the R7795 R1061012 Ignition Cable for ignition installations in high temperat...

Страница 4: ...ow switch recloses 3 PILOT FLAME ESTABLISHING PERIOD At the end of prepurge ST795A timed out the 1K relay pulls in energizing the ignition transformer termi nal 18 and the intermittent pilot valve terminal 5 This starts the ten or four second pilot flame establishing period Safety shutdown and lockout will occur if pres ence of flame is not proven within TensecondsiftheORANGEjumperisnotclipped Fou...

Страница 5: ...TROLLER LIMIT S FLAME AMPLIFIER SOLID STATE LOGIC CKT 3K3 3K1 1K2 F1 S SW S SW 3K 1K 1K 2K1 2K1 INTERRUPTED PILOT VALVE MAIN FUEL VALVE BURNER MOTOR IGNITION TRANSFORMER FLAME DETECTOR FLAME DETECTOR BASIC DIAGRAM OF THE R7795B LINE VOLTAGE ALARM 5 7 6 18 L1 L2 F G G 8 16 9 3 2K ST795A 120 Vac 60 HZ L1 HOT L2 LINE VOLTAGE AIRFLOW SWITCH CONTROLLER LIMIT S FLAME AMPLIFIER SOLID STATE LOGIC CKT 3K3 ...

Страница 6: ... proven within TensecondsiftheORANGEjumperisnotclipped Four seconds if the ORANGE jumper is clipped If the RUN TEST switch is moved to the TEST posi tion during the pilot flame establishing period the se quence is stopped in trial for pilot flame The safety switch heater is energized during this pilot flame establishing period whenever flame is not present Safety shutdown and lockout will occur if...

Страница 7: ...LIMIT S FLAME AMPLIFIER SOLID STATE LOGIC CKT 3K3 3K1 1K2 F1 S SW S SW 3K 4K1 4K2 2K1 2K1 INTERRUPTED PILOT VALVE DELAYED MAIN VALVE MAIN FUEL VALVE BURNER MOTOR IGNITION TRANSFORMER FLAME DETECTOR FLAME DETECTOR BASIC DIAGRAM OF THE R7795D LINE VOLTAGE ALARM 5 7 6 18 L1 L2 F G G 8 16 9 3 2K 4K ST795A RUN TEST SWITCH 120 Vac 60 HZ L1 HOT L2 LINE VOLTAGE AIRFLOW SWITCH CONTROLLER LIMIT S FLAME AMPL...

Страница 8: ... THIS SWITCH IS IN THE RUN POSITION BEFORE LEAVING THE INSTALLATION Installation WHEN INSTALLING THIS PRODUCT 1 Read these instructions carefully Failure to fol low 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 saf...

Страница 9: ... in a salt bath for one minute without breakdown It is rated at 200 F 93 C for continuous duty and up to 300 F 175 C for intermittent use WIRING HOOKUPS The typical wiring hookups in Figs 7 and 8 show the connections to the Q795A Subbase INSTALLING THE R7795 1 Remove the cover from the R7795 2 Position the R7795 over the terminal barrier strips as shown in Fig 1 and press the R7795 onto the subbas...

Страница 10: ...10 Fig 7 Wiring the R7795A B with intermittent pilot Fig 8 Wiring the R7795C D with interrupted pilot R7795A B C D INSTALLATION ...

Страница 11: ...e location of component parts Remove the device cover by loosening the screw WARNING IF FUEL ENTERS THE COMBUSTION CHAMBER FOR MORE THAN A FEW SECONDS WITHOUT IGNITING AN EXPLOSIVE MIXTURE COULD RESULT THE FOLLOWING TIME LIMITS ARE RECOMMENDED Trial for PILOT 10 seconds Trial for MAIN FLAME 5 seconds In any case DO NOT EXCEED THE MANU FACTURER S SPECIFIED NORMAL LIGHT OFF TIME Close the manual mai...

Страница 12: ... for the R7795A C models refer to Table 3 If the minimum average current level cannot be ob tained one or more of the following conditions may exist 1 Check the supply voltage at terminals L1 L2 on the wiring subbase Make sure the master switch is closed connections are correct and the power supply is the correct voltage and frequency 2 Check the flame detector wiring for defects including incorre...

Страница 13: ...ch and let the system recycle 7 When the pilot ignites measure the flame signal If necessary adjust the flame or detector to give the proper flame signal 8 Recycle the system to recheck lightoff and the pilot flame signal NOTE The next steps require two people one to open the manual main shutoff valve s and one to watch for ignition 9 When entering the main flame ignition trial period make sure th...

Страница 14: ...to step 18 a Open the manual second stage oil valve b Restart the system by raising the setpoint of the burner controller c When the first stage burner flame is estab lished watch for the automatic second stage oil valve to open Observe that the second stage flame lights off properly d Make burner adjustments for flame stability and input rating e Shut down the system by lowering the setpoint of t...

Страница 15: ...3 12 Repeat steps 5 through 12 until the main burner positively lights with the pilot just causing the Flame Indicator LED to remain on 13 Repeat the main burner lightoff several times with the pilot at turndown 14 When the main burner lights reliably with the pilot at turndown disconnect the manometer or gauge and turn up the pilot to normal 15 If used remove the bypass jumpers from the low fuel ...

Страница 16: ...e main burner and pilot flames together unless moni toring only the pilot flame when using intermittent igni tion or only the main burner flame with direct spark ignition Check the signal at both high and low firing rate if applicable Also check the flame failure response time Lower the setpoint of the burner controller and observe the time it takes for the Flame Indicator LED to go out after the ...

Страница 17: ...TANT 1 Output terminals MUST NOT BE SHORTED TO L2 Shorted output terminals will cause permanent dam age to the R7795 2 If after performing an applicable troubleshooting procedure proper operation cannot be obtained replace the R7795 except the ST795A Purge Timer unless noted A Relay 3K does not respond to a call for heat 1 Make sure that the safety switch is reset 2 Check the power at terminals L1...

Страница 18: ... ignition spark does not occur or the pilot valve does not open 1 Make sure that all manual fuel valves are opened 2 Check the voltage at the pilot or first stage oil valve terminal 5 and the ignition terminal 18 Check must be made before device locks out 3 If the voltage is zero replace the R7795 NOTE If terminals 5 and or 18 are shorted to L2 the R7795 will be permanently damaged This shorted co...

Страница 19: ...wellcontactcleanerpartno 132569 DO NOT use any other type of contact cleaner 3 Use the utmost care to avoid bending the contacts or changing the configuration in any way 4 Do not use abrasive materials to clean contacts 5 Do not use hard paper such as a business card to clean contacts If relay contacts must be cleaned use only Honeywell pressurized contact cleaner part no 132569 The Honeywell chem...

Страница 20: ...lding Control Helping You Control Your World Honeywell Inc Honeywell Limited Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley MN 55422 Scarborough Ontario M1P 2V9 Printed in U S A www honeywell com bbc QUALITY IS KEY ...

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