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Honeywell RM7824A - page 1
PRODUCT DA T A Copyright © 1995 Honeywell Inc. • All Rights Reserved 7800 SERIES RM7824A Relay Module • First-out annunciation and system dia gnostics are pro vided by a 2-row b y 20-column V acuum Fluorescent Display (VFD) located on the optional Ke yboard Displa y Module. • Five light emitting diodes (LEDs) for sequence information. • Fl ...
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Honeywell RM7824A - page 2
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 2 SPECIFICA TIONS Model: RM7824A Rela y Module for the 7800 SERIES . Electrical Ratings (See T able 1): V oltage: 24 Vdc (22-28 Vdc). Po w er Dissipation: 10W maximum. Maximum T otal Connected Load: 500 V A. Fusing: T otal Connected Load: 20A maxim um, type FRN or equivalent. ORDERING INFORMA TION When ...
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Honeywell RM7824A - page 3
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 3 We i ght: RM7824A with Dust Cov er : 1 pound, 12 ounces, unpac ked. IMPORT ANT Flame Detection System av ailable for use with RM7824A. T o select your Plug-in Flame Signal Amplifier and applicable Flame Detector , see T able 2 and Fig. 3. CA UTION To prev ent the control from sequencing on power up , ...
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Honeywell RM7824A - page 4
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 4 5 (127) 5 (127) M5873 BURNER CONTROL REMOVE ONLY FOR TERMINAL TEST ACCESS. 1 1 6-3/32 (155) Fig. 2. Mounting dimensions of RM7824A Rela y Module and Q7800B Subbase in in. (mm). Dust Cover is part number 221729A. Accessories: Optional: COMBUSTION SYSTEM MANA GER™: Part n umber ZM7850A1001. Communicat ...
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Honeywell RM7824A - page 5
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 5 PRINCIP AL TECHNICAL FEA TURES The RM7824A provides all customary flame safeguard functions while providing significant adv ancements in the areas of saf ety , annunciation and system diagnostics. Safety Shutdown (Lockout) Occurs If: 1. INITIA TE PERIOD . a. 24 Vdc power errors occurred, see Operation ...
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Honeywell RM7824A - page 6
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 6 First-out Annunciation repor ts the cause of a saf ety shutdown or identifies the cause of a f ailure to star t or continue the bur ner control sequence with an English te xt and numbered code via the optional K eyboard Displa y Module. It monitors all field input circuits, including the flame signal ...
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Honeywell RM7824A - page 7
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 7 WIRING 1. a. F or the internal block diagram of the RM7824A, see Fig. 5. b. F or proper subbase wiring, refer to Fig. 6. c. F or proper remote wiring of the Ke yboard Display Module; refer to the Specifications f or the Ke yboard Display Module (65-0090), Communication Interf ace Base Unit (63-2278), ...
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Honeywell RM7824A - page 8
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 8 7. Make sure loads do not e xceed the ter minal ratings . Ref er to the label on the RM7824A or to the ratings in the specifications; see T able 1. 8. Check the po wer supply circuit. The voltage tolerance m ust match those of the RM7824A. A separate pow er supply circuit ma y be required for the RM78 ...
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Honeywell RM7824A - page 9
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 9 ASSEMBL Y Mounting RM7824A NO TE: F or installation dimensions , see Fig. 1 or 2. Relay Module Mounting 1. Mount the RM7824A v er tically , see Figs. 7 or 8, or mount horizontally with the knife b lade ter minals pointing downward. When mounted on the Q7800A, the RM7824A must be in an electrical enclo ...
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Honeywell RM7824A - page 10
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 10 Fig. 10. Flame signal amplifier mounting. Installing Flame Detector NO TE: Ta b le 2 and Fig. 11 list the flame detectors availab le f or use with the RM7824A. Make sure the correct combination of amplifier and flame detector(s) is used. Proper flame detector installation is the basis of a safe and r ...
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Honeywell RM7824A - page 11
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 11 CAPTIVE MOUNTING SCREW DUST COVER RELAY MODULE FLAME AMPLIFIER FLAME CURRENT TEST JACK FLAME SIMULATOR INPUT SEQUENCE STATUS LEDS RESET PUSH- BUTTON M7593 Fig. 13. Sequence status LEDs. Initiate The RM7824A enters the INITIA TE sequence if the Relay Module verifies v oltage fluctuations of outside 22 ...
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Honeywell RM7824A - page 12
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 12 Ta b le 4. Site-Configurable Jumper Options. Jumper Number Description Intact Clipped JR1 Pilot Flame Establishing Period 10 seconds 4 seconds IMPORT ANT After 200 hours of operation, the configuration jumper cannot be changed. If it is changed after 200 hours of operation, the RM7824A loc ks out. Th ...
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Honeywell RM7824A - page 13
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 13 Ta b le 5. Static Checkout (Continued). Test No. RM7824A Models Test Jumpers Voltmeter Normal Operation If Operation is Abnormal, Check the Item Listed Below 4A ll 3-8 — 1. Ignition spark (if ignition transformer relay is connected to terminal 8). 2. Automatic pilot valve opens (if connected to ter ...
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Honeywell RM7824A - page 14
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 14 • Hot refractory hold-in test—all installations. • Ignition spark pickup—all installations using Ultra violet Flame Detectors. • Response to other ultraviolet sources—all installations using Ultra violet Flame Detectors. • Flame signal with hot combustion chamber—all installations. ? ...
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Honeywell RM7824A - page 15
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 15 6. Make sure that the detector is properly sighting the flame. 7. If necessar y , resight or reposition the detector . Initial Lightoff Check for Proved Pilot. P erform this check on all installations that use a pilot. It should immediately f ollow the preliminary inspection. NO TE: Low fuel pressure ...
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Honeywell RM7824A - page 16
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 16 Initial Lightoff Check for Direct Spark Ignition This check applies f or gas and oil bur ners that do not use a pilot and it should immediately f ollow the preliminary inspection. Refer to the appropriate sample bloc k diagram of field wiring for the ignition transf or mer and fuel v alve(s) hookup . ...
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Honeywell RM7824A - page 17
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 17 b. As the control attempts to relight the pilot, increase the pilot pressure immediately until the FLAME LED comes on, and then slowly turn it down to obtain a pressure reading just abov e the dropout point or until the flame signal increases to appro ximately 1.25 Vdc. This step must be completed wi ...
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Honeywell RM7824A - page 18
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 18 IMPORT ANT 1. If the RM7824A fails to shut do wn on any of these tests, tak e correctiv e action (refer to T roubleshooting, RM7824A diagnostics and return to the beginning of all Checkout tests). 2. When all Check out tests hav e been completed, reset all s witches to original states. TROUBLESHOOTIN ...
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Honeywell RM7824A - page 19
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 19 Ta b le 7. Sequence And Status Hold Information. NO TE: Normal sequences are in bold type , while abnormal sequences are in standard type. Sequence Information INITIATE The LED indicates the burner status, POWER, which is a stabilization period for the RM7824A to check for any fluctuations in dc volt ...
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Honeywell RM7824A - page 20
7800 SERIES RM7824A RELA Y MODULE 65-0155—1 20 Helping You Control Your World Home and Building Control Honeywell Limited-Honeywell Limitée 740 Ellesmere Road Scarborough, Ontario M1P 2V9 65-0155—1 Re v . 6-95 G.R. Printed in U .S.A. www .honeywerll.com/bbc Ta b le 8. Hold And Fault Message Summary . Fault Number Annunciation Message • Fault ...
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