11
Optional Equipment:
If a shunt trip breaker is required, connect the shunt trip control voltage from the Control Box terminal Shunt Trip
Hot (STH) to the trip terminals on the shunt trip breaker (a neutral may be supplied from breaker panel). This will
provide 120V 1 PH power to trip the breaker in Fire Mode (See Pg. 9).
If a Tempered MUA unit is used, it must have a starter/ contactor in unit and power wiring from the breaker panel of
proper Voltage and Phase connected to the unit (See wiring Diagram) and a separate low voltage (18 AWG Min. up
to 250’) connection must be wired from the Tempered MUA unit control panel terminals R and G to the Control Box
terminals R and G (See Pg. 9). The jumper from between terminals R and G in the Tempered MUA unit must be
removed if this connection is made.
If Wiring for building fire alarm, strobe horn, etc. is required field wire to the proper Common, Normally Closed or
Normally Open terminals in the control box. Up to 120V 15A power may be connected to C2 and/or C3 for
activation or de-activation of auxiliary controls in Fire Mode. The NC2 and NO2 terminals will have whatever
voltage has been connected to C2. The NC3 and NO3 terminals will have whatever voltage has been connected
C3. In Fire Mode, NC2 and NC3 contacts will open and no longer have the connected power through these
terminals for “Off in Fire”. At the same time, NO2 and NO3 will close in Fire Mode supplying the connected voltage
to those terminals for “On in Fire” (See Pg. 10).
For technical support contact Larkin Industries, Inc. 1-800-322-4036
System Startup
Turn on all breakers that power the fan starter(s) or contactor(s), Control Box power, hood lights, and Tempered MUA
unit power (If Tempered MUA is used). Check for proper voltage at all terminals with fan switch off. Cooking
equipment should be off, and fan(s) should not be operating.
If the fan(s) and light(s) come on with the switches in the “OFF” position, the temperature sensor in the hood has
detected a temperature rise. If only the Exhaust fan(s) come on immediately, check for proper connection of Fire
System Micro-Switch (See Pg. 7) or check that the Fire Suppression system is not in the discharged position.
With the fan switch in the off position, turn on the light switch to energize the hood lights. The light indicator lamp
should illuminate to show that the lights are on. If the hood light(s) are not working:
1.
Verify that the bulbs are installed.
2.
Verify that all connections to hood(s) have been made and breakers are on. If the light(s) are working
properly, de-energize the light(s) by returning the light switch to the off position.
Turn on fan(s) using the “FAN” switch. The fan and light indicator lamps should illuminate (hood lights are interlocked
with fan switch). This indicates the fan(s) and light(s) should be operating. If fan(s) are not operating, check all
connections to and from Control Box.
Check the rotation of the fans.
Note:
The exhaust fan(s) will exhaust some air while rotating in reverse. Checking
rotation may be accomplished in two different ways, (1) by comparing the direction the fan wheel is rotating to the
direction arrow on the fan(s) or (2) check the amperage of each fan with a meter. A fan turning in reverse rotation will
exceed the rated FLA of the motor. If the amperage is higher than the listed FLA for the fan, it is spinning in reverse
rotation. To reverse rotation, (3 Ph only) change any 2 leads connected to the starter (T1, T2, T3). For 1 Phase,
rotation must be changed at the motor (See instructions on motor plate).
CAUTION! More than one disconnect switch may be required to de-energize the equipment before servicing.
Ensure all power sources have been disconnected before installing or servicing the system.
See Fan IO&M for further instructions on fan start-up procedures.
Summary of Contents for Auto Fan Control
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