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7800 SERIES EC7895A, RM7895A
Relay Module
PRODUCT DATA
• Dependable, long-term operation provided by microcomputer
technology.
• First-out annunciation and system diagnostics provided by a 2
row by 20 column Vacuum 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 EC7895 and RM7895
operation and fault information.
• Nonvolatile memory; EC7895 and RM7895 r
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7800 SERIES EC7895A, RM7895A RELAY MODULE Electrical Ratings, see Table 1A: SPECIFICATIONS Voltage and Frequency: 100 Vac (+10/-15%), 50 or 60 Hz 1 (+/- 10%). Model: Power Dissipation: RM7895: 10W maximum. RM7895A Maximum Total Connected Load: 2000 VA. Fusing Total Connected Load: 20A maximum, type FRN or equivalent. Table 1A. RM7895A Terminal Ratings. Terminal No. Description Ratings G Flame Sensor Ground 2 Earth G Earth Ground L2(N) Line Voltage Common 3 Alarm 100 Vac, 1A pilot duty. 4 Bur
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7800 SERIES EC7895A, RM7895A RELAY MODULE Model: Electrical Ratings, see Table 1B: EC7895 Voltage and Frequency: 200 Vac (+10/-15%), 50 or 60 Hz 1 (+/- 10%). Power Dissipation: EC7895: 10W maximum. Maximum Total Connected Load: 2000 VA. Fusing Total Connected Load: 20A maximum, type FRN or equivalent. Table 1B. EC7895A Terminal Ratings. Terminal No. Description Ratings G Flame Sensor Ground 2 Earth G Earth Ground L2 (N) Line Voltage Common 3 Alarm 200 Vac, 1A pilot duty. 4 4 Burner Motor 20
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7800 SERIES EC7895A, RM7895A RELAY MODULE Environmental Ratings: Weight: Ambient Temperature: RM7895 with Dust Cover: 1 pound 15 ounces, unpacked. Operating: -40° F to 140° F. Storage: -60° F to 150° F. IMPORTANT Humidity: 85% RH continuous, noncondensing. Flame Detection System available for use with Vibration: 0.5G environment. EC7895 and RM7895. To select your Plug-in Flame Signal Amplifier and applicable Flame Detector, see Dimensions: Table 2 and Fig. 3 through 5. Refer to Fig. 1 and 2. Tab
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7800 SERIES EC7895A, RM7895A RELAY MODULE Sequence Timing For Normal Operation: Flame Establishing Period Device Initiate Standby Purge Pilot Main EC7895A/RM7895A 10 sec. * ** 4 or 10 sec. No *STANDBY and RUN can be an infinite time period. ** PURGE is determined by the ST7800A Purge Card selected. Approval Bodies: Accessories: RM7895A: Optional: Underwriters Laboratories Inc. listed: File no. MP268, Network Interface Unit, Guide no. MCCZ. Part No. Q7700A1014, 120V 50/60 Hz Factory Mutual approv
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7800 SERIES EC7895A, RM7895A RELAY MODULE BURNER CONTROL 5 (127) POWER PILOT 1 FLAME MAIN ALARM RESET 6-3/32 (155) 5 (127) REMOVE ONLY FOR TERMINAL TEST ACCESS. M11134 1 Fig. 2. Mounting dimensions of EC7895/RM7895 Relay Module and Q7800B Subbase in in. (mm). IGNITION ELECTRODE FLAME ROD (Q179C ONLY) CERAMIC INSULATORS 1 (25) 1-21/32 1-13/32 (42) (36) TARGET MOUNTING FLANGE 3/4–14 NPT 3/8 (10) 7-7/32 (183) 5-1/8 (130) 3-1/8 1-1/16 3-3/4 (79) (27) 1/2 (13) (95) 3-7/16 (87) 3/32 (2) 11/16 (18)
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7800 SERIES EC7895A, RM7895A RELAY MODULE 4-1/8 (105) 2 2 (51) 1/2-14 NPSM COLLAR WITH INTERNAL THREADS 1–11-1/2 NPSM 1-3/16 INTERNAL 1 (30) 4 (102) 6 FOOT (1.83 METER) THREADS LEADWIRES (2) 1 3-1/2 (89) 31/32 1-1/2 (25) (38) 1-1/16 (27) 2 6 FOOT 2-5/8 (67) [1.83 METER] INSERTION DEPTH LEADWIRES (2) 3 COLLAR WITH 1/2-14 NPSM INTERNAL THREADS 1 DIN APPROVED C7035A1064 HAS 1-11 BSP.P1 INTERNAL THREADS. 1 MODEL AVAILABLE WITH 24 FOOT (7.32 METER) LEADWIRES. 2 DIN APPROVED C7035A1064 HAS 1/2-14 BS
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7800 SERIES EC7895A, RM7895A RELAY MODULE 11-13/16 (300) 2-5/32 1-27/32 1 INCH NPT 7-13/16 (198) 5-13/16 (147) (55) (47) 15/16 [24] DIA. 5-13/16 6-7/32 (147) (158) 2-1/2 (64) 6-19/32 (168) 1 (25) 15/16–18 UNC (2 EACH) 2 (51) C7076D M5084A Fig. 4. Ultraviolet detectorsin in. (mm) (Continued). d. Main valve terminal is energized. CELL MOUNT HEAT BLOCK e. Internal system fault occurred. 1-5/8 (41) f. Purge card is removed. 2-3/4 1-1/16 (27) (70) g. Purge card is bad. 4. Pilot Flame Establishing Pe
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7800 SERIES EC7895A, RM7895A RELAY MODULE Dynamic Ampli-Check® Verified Spark Termination Dynamic AMPLI-CHECK® circuitry tests the flame signal The ignition terminal is monitored to assure early spark amplifier during burner operation and shuts down the EC7895 termination (ten seconds ignition and pilot and ten seconds or RM7895 if the flame amplifier fails. pilot and main only). Dynamic Flame Amplifier and Shutter Check First-Out Annunciation AND Self-Diagnostics Self-checking circuitry tests a
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7800 SERIES EC7895A, RM7895A RELAY MODULE When Installing this Product… Humidity 1. Read these instructions carefully. Failure to follow them Install the EC7895 or RM7895 where the relative humidity could damage the product or cause a hazardous never reaches the saturation point. The EC7895 or RM7895 condition. is designed to operate in a maximum 85% RH continuous, 2. Check the ratings given in the instructions and marked noncondensing, moisture environment. Condensing moisture on the product to
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7800 SERIES EC7895A, RM7895A RELAY MODULE L1 (HOT) L2 1 5 L2 2 PLUG-IN PURGE CONFIGURATION TIMER CARD JUMPERS TEST FLAME SIGNAL JACK RUN/TEST F SWITCH PLUG-IN G MICROCOMPUTER FLAME AMPLIFIER TEST RESET 22 PUSHBUTTON 2K 3K RELAY RELAY STATUS 4K DRIVE FEEDBACK CIRCUIT 5K AND LINE 6K VOLTAGE INPUTS 7K SAFETY RELAY 1K CIRCUIT STATUS LEDs CONTROL POWER SUPPLY POWER LOCKOUT INTERLOCK LIMITS CONTROLLER 1K1 2K1 5K1 6 7 10 IGNITION 4K1 8 PILOT 7K1 21 PILOT/V2 2K2 MAIN VALVE 9 6K1 4 BLOWER 3K1 3 AL
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7800 SERIES EC7895A, RM7895A RELAY MODULE b. For EC7895 or RM7895, each device has an 7. Maximum wire lengths: earth ground terminal that must be grounded to a. For the EC7895 or RM7895, the maximum length the metal control panel with wire as short as of leadwire to the terminal inputs is 300 feet practical. Each ground wire must be capable of (Control and Airflow Interlock). carrying a fault current equal to the rating of the b. For the flame detector leadwires, the maximum protective fuse (20A
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7800 SERIES EC7895A, RM7895A RELAY MODULE Q7800 G 12 L2 13 200 VAC ALARM 3 (L1) 14 BURNER MOTOR 4 15 (BLOWER) 5 16 BURNER 6 17 CONTROLLER/LIMITS 2 7 AIRFLOW INTERLOCK 18 INTERMITTENT 8 19 PILOT/IGNITION MAIN FUEL 9 20 VALVE(S) IGNITION 10 21 F 22 RECTIFYING FLAME L1 ROD, RECTIFYING (HOT) PHOTOCELL, OR INFRA- 1 RED (LEAD SULFIDE) L2 FLAME DETECTOR MASTER SWITCH OR C7027A, C7035A, OR BLUE WHITE C7044A ULTRAVIOLET FOR DIRECT SPARK IGNITION (OIL FLAME DETECTOR OR GAS) OR 4 IGNITION 10 TRANSFORMER
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7800 SERIES EC7895A, RM7895A RELAY MODULE Installing Plug-In Flame Signal Amplifier ASSEMBLY 1. Disconnect the power supply before beginning installation to prevent electrical shock and equipment Mounting RM7895 damage. More than one disconnect may be involved. 2. Align the amplifier circuit board edge connector with the NOTE: For installation dimensions, see Fig. 1 or 2. keyed receptacle on the EC7895 or RM7895. Ensure the amplifier nameplate faces away from the Relay Module, see Fig. 13. Relay
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7800 SERIES EC7895A, RM7895A RELAY MODULE Fig. 12. Dust Cover mounting. Fig. 10. Wall or burner installation. Fig. 13. Flame signal amplifier mounting. Fig. 11. ST7800 Purge Card installation. 15 65-0205
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7800 SERIES EC7895A, RM7895A RELAY MODULE C7076A,D ULTRAVIOLET DETECTOR INFRARED (C7015) REMOTE SENSOR 6 F 7 WHITE EARTH F 3b 3a 2b GROUND 5 G 8 BROWN G 2a 4 SHUTTER L1 1 C7076A OR 3 SHUTTER L2 2 C7076D TERMINAL BLOCK ULTRAVIOLET (C7027/C7035/C7044) L1 (HOT) L2 (COMMON) BLUE F 7800 SERIES 1 WHITE G F G L2 5 22 3 SOLID STATE SELF-CHECKING SOLID STATE ULTRAVIOLET (C7012E,F) ULTRAVIOLET (C7012A,C) BLUE BLUE F F 2 YELLOW YELLOW 2 G G WHITE 22 BLACK L1 WHITE BLACK L2 L2 BLACK 3 L1 BLACK L2 SOLID STA
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7800 SERIES EC7895A, RM7895A RELAY MODULE Ignition Trials OPERATION a. Pilot Flame Establishing Period (PFEP): 1. The pilot valve and ignition transformer, terminals 8 Sequence of Operation and 10, are energized. The EC7895 or RM7895A The EC7895 or RM7895 has the following operating has an intermittent pilot valve, terminal 8. sequences, see Fig. 15. 2. Flame must be proven by the end of the 4 or 10 sec-ond PFEP to allow the sequence to continue. If flame is not proven by the end of PFEP, a Init
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7800 SERIES EC7895A, RM7895A RELAY MODULE 5. For each test, open the master switch and install the Equipment Recommended jumper wire(s) between the subbase wiring terminals 1. Voltmeter (1M ohm/volt minimum sensitivity) set on the listed in the Test Jumpers column of Table 4. 0-300 Vac scale. 6. Close the master switch before observing operation. 2. Two jumper wires; no. 14 wire, insulated, 12 inches 7. Read the voltage between the subbase wiring terminals (304.8 mm) long, with insulated alligat
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7800 SERIES EC7895A, RM7895A RELAY MODULE SELECTABLE CONFIGURATION JUMPERS Table 3. Site Configurable Jumper Options. Jumper Number Description Intact Clipped JR1 Pilot Flame 10 seconds 4 seconds Establishing Period JR2 Flame Failure Recycle Lockout Action JR3 Airflow Switch Recycle Lockout (ILK) Failure M11126 Fig. 17. Selectable site-configurable jumpers. Table 4. Static Checkout. Test Test Volt- If Operation Is Abnormal, No. Jumpers meter Normal Operation Check The Items Listed Below WARNIN
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7800 SERIES EC7895A, RM7895A RELAY MODULE Checkout Summary CHECKOUT • Preliminary inspection—all installations. • Flame signal measurement—all installations. WARNING • Initial lightoff check for proved pilot—all installations using a pilot. Do not allow fuel to accumulate in the combustion • Initial lightoff check for direct spark ignition of oil—all chamber. If fuel is allowed to enter the chamber for burners using DSI. longer than a few seconds without igniting, an • Pilot turndown test—all in
