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January 2022
Installation, Operation, and Maintenance Instructions
Description:
The Larkin Auto Fan Control™ will automatically energize the fan(s) prior to cooking operations commencing
per IMC code 507.1.1 by means of a temperature sensor.
System Components:
The Larkin Industries AFC (Auto Fan Control™) wall mount Control Box includes the following:
•
Wall mounted 12" x 22" x 6" stainless steel enclosure with hinged door and tamper resistant latch.
Enclosure may be recess mounted (with optional trim ring).
•
Switches with LED indicator lights mounted on enclosure door for system operation.
•
Exhaust and Make Up Air (MUA) fan(s) are interlocked. If hood fire suppression system is activated, the
lights and MUA fan(s) shut down. The Exhaust fan(s) will continue to operate.
•
Temperature sensor(s) factory mounted in hood(s).
•
Exhaust and MUA fan starter(s) (3 Ph) or contactor(s) (1 Ph).
•
Prewired with terminal strips and wiring diagrams.
Note: Wall mounted box size 12" x 22" x 6" for up to 4 starters or contactors and 18" x 26" x 8" for 5-8
starters or contactors.
For technical support contact Larkin Industries, Inc.
Auto Fan Control™
1
1-800-322-4036
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Summary of Contents for Larkin Auto Fan Control
- Page 1 Auto Fan Control™ Installation, Operation, and Maintenance Instructions Description: The Larkin Auto Fan Control™ will automatically energize the fan(s) prior to cooking operations commencing per IMC code 507.1.1 by means of a temperature sensor. System Components: The Larkin Industries AFC (Auto Fan Control™) wall mount Control Box includes the following: •...
- Page 2 Mounting Wall Mounted: • For wall mounted AFC, the Control Box will be housed in a 12” x 22” x 6” stainless steel enclosure and should be secured to a fixed wall near the exhaust hood(s) it controls (Fig. 1). Enclosure may be recess mounted with optional trim ring.
- Page 3 Figure 3 Connections Required for System Larkin S/S 12” x 22” x 6” AFC Control Box with hinged door and switches: - Low Voltage wiring to hood sensor(s) - Wiring to lights in hood(s) - Fire suppression micro switch wiring...
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Page 4: Wiring Instructions
When the Larkin AFC is ordered with a Larkin Industries hood model, the temperature sensor will be factory mounted in each hood, so no field installation is required. Any AFC ordered for a non-Larkin hood(s), or Retro-fit application, the temperature sensor(s) will have to be field installed in each hood controlled by the system. A 3/4”- 7/8”... - Page 5 3 Ph starter to the fan. 4. When wiring to a Larkin Industries Tempered MUA unit, a separate Start-Stop control circuit must be connected to the Tempered MUA unit from the control panel, or the unit will not operate. (See Heated...
- Page 6 Remote Switch Panel: When a remote switch panel is required, field connections must be made from the Light Switch to terminals Light Switch 1 (LS1) and Light Switch 2 (LS2). Field connections also must be made from the Fan Switch to terminals Fan Switch 1 (FS1) and Fan Switch 2 (FS2) in the Control Box. Non-lighted switches are provided for contact closure that will activate the lights and fans.
- Page 7 Micro Switch: The Larkin AFC requires a Fire Suppression System Micro-Switch connection. The Micro-Switch should be field wired from the Fire Suppression System to the Control Box connecting the Common (C) lead from the Micro-switch to the Fire Switch Common (FSC) terminal in the Control Box. Connect the Normally Closed (NC) lead from the Micro-switch to the Fire Switch Normally Closed (FSNC) terminal in the Control Box.
- Page 8 Fan Input Power From Breaker Panel: Check the power source to see if it is compatible with the requirements of the provided system. The AFC wiring diagram lists the proper Phase, Voltage, and Amp load. Verify input power voltage before connecting to starters or contactors. Field wire proper Phase and Voltage from the breaker panel to the correct terminals in the Control Box for each fan being controlled.
- Page 9 Temper MUA Connection: When wiring a Larkin Industries Tempered MUA unit to the control box, use low voltage wiring (18 AWG Min. up to 250’) from terminals R and G in Control Box to terminals R and G in the Tempered MUA control panel.
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Page 10: Installation Checklist
Spare Dry Contact Connections: Two spare dry contacts with normally open and normally closed connections, C2, NC2, NO2 and C3, NC3, NO3. Contacts are provided for activation of building alarm, horn strobe, etc. Up to 120V 15A power may be connected to C2 and/or C3 for activation or de-activation of auxiliary controls in Fire Mode. -
Page 11: System Start-Up
“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). -
Page 12: Test Procedures
The start up is now complete. To test the systems fire suppression interlock, and Auto Fan Control for IMC 507.1.1 compliance, follow the Test Procedures in the next section. For operation information and system adjustments see System Operation section. Test Procedures Testing of the System for IMC 507.1.1 Compliance: Please read complete test procedures prior to... -
Page 13: Maintenance
The system may also be manually operated by turning the light and fan switches “ON” and “Off”; however, the system will enter “Auto Run Mode” if the system detects a temperature rise associated with cooking operations. If the system changes from “Manual Mode” to Auto-Mode” because of a temperature rise, it will shut down automatically once the system no longer detects a cooking operation. - Page 14 ********************************************************************************************************************************* (See Pg. 7)
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