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The FW851 isolator module isolates the short point on the signaling line circuit (SLC) or Data Communication Link (DCL). The internal relay will be triggered to cut down the line power where the short trouble is detected. The device LED will indicate the trouble condition by yellow steady on. A return to normal condition will cause the internal relay to normal position to restore the line power and the device LED indicator will return to the idle condition. The FW851 does not occupy an address on the Fire Alarm Control Panel’s SLC/DCL, so no address programming is required. The FW851 is a UL listed product according to UL864 and ULC-S527 for Fire Protective Signaling Systems for indoor use.
The products must be installed in accordance with the NFPA 72, the CAN/ULC‐S524, and the Canadian Electrical Code depending on the country of installation. Check information of equipment used in the system by other manufacturers for any guidelines or restrictions.
Do not paint this device.
Any material extrapolated from this document or from Maple Armor’s instructions or other documents describing the product for use in promotional or advertising claims, or for any other use, including description of the product’s application, operation, installation, and testing is the sole responsibility of the user. Maple Armor will not assume any liability for such use. In no case will Maple Armor’s liability exceed the purchase price paid for a product.
Nominal Voltage24VDC
Voltage Range15 to 28VDC
Standby Current1.6mA
Active Current10.8mA
Operating Temperature32°F to 120°F (0°C to 49°C)
Operating Humidity 0% to 93% RH
Dimension 120 mm (L) x 120 mm (W) x 45 mm (H)
Weight (with backbox)8.8 oz (249 g)
MountingFW800 Base
Mounting LocationIndoor Wall
Wiring Gauge12 to 18 AWG

1.Mount the FW800 base onto a 2X4 or 4x4 electrical box using the screws provided, as illustrated in Figure 1.
Figure 1. Installation Diagram
2.Connect the wires, see Figure 2. There is polarity insensitive between terminal 1 and terminal 2, and between terminal 7 and 8. All circuits are power-limited.

Figure 2. Module Wiring Diagram
3.Wire the SLC/DCL to the module, as illustrated in Figure 3.
                                             (a) Class A or DCLA Circuit                                                (b) Class B or DCLB Circuit
Figure 3. SLC/DCL Wiring Diagram
4.Combine the assembled unit to the base using the screws provided.
5. Apply power to the control unit.
1.Before testing, inform the proper authorities that the system is undergoing maintenance and will temporarily be put out of service. Disable the system to prevent unwanted alarms. 
2.Make a short circuit trouble on the SLC/DCL. Check the FW851 internal relay to see if it is triggered and to verify if the LED turned to steady on.
3.Restore the short circuit trouble and check the FW851 internal relay to see if it is restored to normal position and to verify that the LED turned off.
4.Once the testing is completed, set the system back to normal operation and inform proper authorities.