7800 Series RM7824A Relay Module Pages 07-09. CSI 3-Part Specifications.

7800 SERIES RM7824A Relay Module

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WIRING

1.

a. For the internal block diagram of the RM7824A, see Fig. 5.
b. For proper subbase wiring, refer to Fig. 6.
c. For proper remote wiring of the Keyboard Display Module; refer to the Specifications for the Keyboard Display Module (65-0090), Communication Interface Base Unit (63-2278), DATA CONTROLBUS MODULE™ (65-0091), or Extension Cable Assembly (65-0131).

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 wiring.

4.

a. Recommended wire size and type: Use No. 14, 16, or 18 copper conductor (TTW60C or THW75C or THHN90C) 600 volt insulation wire for all low voltage terminals. For high temperature installations, use wire selected for a temperature rating above the maximum operating temperature. All leadwires must be moisture resistant.
b. The maximum number of wires per terminal is two. If more than two wires need to be connected to a terminal, wire one of the wires to the terminal and use a wire nut to connect the other wires inside the subbase.

5. Recommended wire routing for flame detector leadwires:

- Do not run high voltage ignition transformer wires in the same conduit with the flame detection wiring.

- Do not route scanner wires in a conduit with line voltage circuits.

- Enclose scanner wires without armor cable in metal cable or conduit.

- Follow directions given in the flame detector instructions.

6. Maximum wire lengths:

a. For the RM7824A, the maximum length of leadwire to the control terminal input is 300 feet.
b. For the flame detector leadwires, the maximum flame sensor leadwire length is limited by the flame signal strength.

PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

Fig. 5. Internal block diagram of the RM7824A (see Fig. 6 for detailed wiring instructions).

7. Make sure loads do not exceed the terminal ratings.  Refer to the label on the RM7824A or to the ratings in the specifications; see Table 1.

8. Check the power supply circuit. The voltage tolerance must match those of the RM7824A. A separate power supply circuit may be required for the RM7824A with the required disconnect means and overload protection added.

9. Check all wiring circuits and complete the Static Checkout section before installing the RM7824A on the subbase; see Table 5.

10. Install all electrical connectors.

11. Restore power to the panel.

1> 24 VDC POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2> DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.

3> FOR A CONTINUOUS OR STANDING PILOT, INSTALL AN EXTERNAL RELAY TO SWITCH THE F LEAD. THE RELAY MUST HAVE GOLD-CLAD OR GOLD-FLASH CONTACTS AND A 120 VAC COIL. POWER THE RELAY COIL FROM THE Q7800 SUBBASE TERMINAL 8. CONNECT THE RELAY CONTACTS BETWEEN THE F LEAD OF THE DETECTOR AND THE F TERMINAL OF THE Q7800 SUBBASE. A 24 VDC RELAY IS ACCEPTABLE TO USE IN THIS TYPE OF APPLICATION. USE THE N.O. PILOT DUTY CONTACTS.

Fig. 6. Wiring the RM7824A.

ASSEMBLY

Mounting RM7824A

NOTE: For installation dimensions, see Fig. 1 or 2.

Relay Module Mounting

1. Mount the RM7824A vertically, see Figs. 7 or 8, or mount horizontally with the knife blade terminals pointing downward. When mounted on the Q7800A, the RM7824A 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 RM7824A, dust cover, flame amplifier, flame amplifier signal voltage probes, electrical signal voltage probes and electrical connections.

a. Allow an additional two inches below the RM7824A for the flame amplifier mounting.
b. Allow an optional three-inch minimum to both sides of the RM7824A 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.

IMPORTANT The RM7824A must be installed with a plug-in motion rather than a hinge action.

4. Mount the RM7824A 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. Do not tighten the screws to the point where they deform the plastic of the RM7824A case.

Fig. 7. Electrical panel installation.

Mounting Dust Cover

1. Align the two interlocking ears of the Dust Cover with the two mating slots on the RM7824A (see Fig. 9).
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 RM7824A.
3. Be sure the Dust Cover is firmly in place.

Fig. 9. Dust Cover mounting.

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 RM7824A. Verify that the amplifier nameplate faces away from the Relay Module (see Fig. 10).
3. Push in the amplifier until the circuit board is fully inserted into the receptacle and then push the amplifier toward the RM7824A retaining clasp.
4. Verify the amplifier is firmly in place.
5. Perform all required checkout tests.