Repairing and Replacement of faulty LCM and LEM Card of fire alarm system (Notifier make) installed in LHC Academic area IIT Delhi.

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Supply, installation, testing & commissioning of LCM & LEM card, card specification as below the card should have followings:- Features up to 12,500 feet (3,810m) on a Class B (style 4) SLC loop (twisted-unshielded) Built-in degraded mode increases survivability very simple installation – plug-in style. Permits multiple loops in small enclosure voltage: 24 VDC nominal, 27.6 VDC maximum. Maximum loop length: The maximum wiring distance of an SLC using 12 AWG (3.1mm²) Twisted-pair wire is 12,500 feet (3810m) per channel. For a twisted-unshielded pair, 12AWG (3.1mm²) 18 AWG (0.78mm²):Distance with 12AWG : 12,500 ft (3,810m) Distance with 14 AWG: 8000 ft (2438m) Distance with 16 AWG: 3225 ft (983m)- 50 ohms maximum per length of style 6 & 7 loops- 50 ohms maximum per branch for style 4 loop. Maximum current: for LCM-320: 130 ma: for LEM-320:100ma for single SLC loop: 400 ma: maximum. Note maximum short-circuit – loop will shut down until short-circuit condition is corrected. Maximum resistance: 50 ohms (supervised and power limited) Temperature and humidity ranges: this System meets NFPA requirements for operation at 0-49°C /32-120°F and at a relative humidity 93% ± 2°C (90°F ± 3°F) UL:S635 ULC: S635/CS118 FM approved CSFM: 7165-0028:224, 7170-0028:223 (LCM/LEM-320 with NFS-3030/nfs2-3030) 7165-0028:214, 7170- 0028:243, 7170-0028:244 (LEM-3202 with NFS2-6240) Make: Notifier.