This electrical and mechanical control wiring diagram details the connections for a 120V single-phase spring-return fire smoke damper actuator. Power is supplied through a local disconnect switch and a circuit breaker or fused disconnect as required by the electrical contractor. A duct smoke detector provides a normally closed contact that breaks on alarm to close the damper per CMC 2019 605.8, while an optional relay with a 24V coil and 120V rated contact interfaces with the AC unit status. The associated fire-life-safety contractor oversees control connections that shut down the AC unit or fan upon receipt of an alarm from supply air or local smoke detectors. Specific operational notes mandate that all associated dampers open upon receiving a signal from the timeclock fan run signal and close when that proof run signal is removed.
M M E E E E RELAY (IF NECESSARY) WITH 24V COIL AND 120V RATED CONTACT. CIRCUIT BREAKER OR FUSED DISCONNECT AS REQUIRED DUCT SMOKE DETECTOR BY ELECTRICIAN. NORMALLY CLOSED CONTACT FROM LOCAL SMOKE DETECTOR. BREAK ON ALARM TO CLOSE DAMPER. DEVICE & CONTROL BY ELEC CONTRACTOR PER CMC 2019 605.8 NORMALLY CLOSED CONTACT TO ASSOCIATED AC UNIT/FAN FOR AC UNIT/FAN SHUT DOWN. SEE NOTE 3. BY FLS CONTRACTOR. AC UNIT STATUS (DIRECT FROM UNIT OR FLS PANEL). NORMALLY OPEN RELAY. FSD CLOSES UPON LOSS OF SIGNAL. (NOT REQUIRED IF DUCT OR AREA SMOKE DETECTOR DOES NOT HAVE MINIMUM FLOW REQUIREMENT PER CODE 2019 CBC 717.3.3.2.1) LOCAL DISCONNECT SWITCH BY ELECTRICIAN 120VAC, SPRING RETURN DAMPER ACTUATOR (PROVIDED WITH DAMPER ASSEMBLY) 115V-1Ø FSD OPEN/CLOSE NOTES: 1. ALL ASSOCIATED FIRE/SMOKE DAMPERS SHALL OPEN WHENEVER A SIGNAL IS RECEIVED FROM THE TIMECLOCK/FAN RUN SIGNAL. 2. ALL ASSOCIATED FIRE/SMOKE DAMPERS SHALL CLOSE WHENEVER A SIGNAL FROM THE TIMECLOCK/FAN PROOF RUN SIGNAL IS REMOVED. 3. THE AC UNIT/FAN AND ALL ASSOCIATED FIRE/SMOKE DAMPERS SHALL SHUT DOWN WHENEVER: • AN ALARM IS RECEIVED FROM THE AC UNIT/FAN SUPPLY AIR SMOKE DETECTOR. • AN ALARM IS RECEIVED FROM ANY OF THE LOCAL SMOKE DETECTORS AT ANY OF THE FIRE/SMOKE DAMPERS.
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