Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble,
install, operate or maintain the product described. Protect yourself and others by observing all safety
information. Failure to comply with instructions could result in personal injury and/or property damage!
1
Digital Temperature Interlock
General Description
Description
The temperature interlock is designed to automatically
start kitchen hood exhaust fans and keep them
running while heat is being generated from the cooking
appliances. Hood systems should always be manually
started before equipment is turned on. If the fans are
forgotten to be turned on, the interlock will turn the fans
on once heat is detected. The interlock consists of a
temperature controller, resistive temperature detector
(RTD), junction box, Evergreen Compression Seal
threaded fitting, and is contained in a stand alone box or
can be added to a pre-engineered fan control center.
Purpose
To meet IMC 2006 section 507.2.1.1, interlock between
exhaust fans and cooking equipment. This system will
utilize a temperature sensor in the exhaust duct collar
or in capture area of hood to detect heat generated
from cooking operations and automatically activate the
exhaust fans if not already turned on. Field wiring may
be required depending on location of components.
Product Application
The temperature interlock is designed to be used
with Type I and Type II hoods. It is not to be used in
conjunction with exhaust fire dampers. Greenheck
recommends using one interlock per hood system
(activates all fans linked to system simultaneously).
Performance Goals
Automatically energize the exhaust fans when cooking
equipment generates heat. Basic controls will be
provided with a temperature sensor and will consist
of an 8 x 8 electrical box with controls and a labeled
terminal strip to hook-up incoming power and fan
starters. A temperature controller is used to keep the
exhaust fans running when the temperature controller
initially closes to prevent the fan from cycling on and
off at startup and shut down. Fans will shut down
automatically once the temperature has gone below the
set point plus hysteresis. The hysteresis can be adjusted
based on jobsite requirements.
Product Specification
Digital Temperature Interlock
International Mechanical Code (IMC) 2006 section
507.2.1.1 Compliant Electrical Package
Provide Greenheck Fan Corporation temperature
interlock electrical package as shown on plans and in
accordance with the following specification:
The temperature interlock(s) consists of a temperature
controller, resistive temperature detector (RTD), junction
box, fire proof/leak proof threaded fitting (Evergreen
Quik-Seal® and/or Evergreen Compression Seal), and
shall be a self-contained unit or as part of another pre-
engineered electrical control package.
The temperature interlock package shall close a
relay powering the fans when the sensor detects the
temperature set point. The interlock shall hold the
circuit closed upon fan switch being turned off until the
temperature sensor detects a temperature below the set
point plus hysteresis. Once the temperature is below the
set point plus hysteresis, the fans shall shut down.
The temperature interlock package shall be constructed
by Greenheck Fan Corporation in accordance with
International Mechanical Code. The manufacturer shall
provide, upon request, the necessary data that confirms
compliance with the code listed above.
Due to continuous research, Greenheck Fan
Corporation reserves the right to change specifications
without notice.
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Document 474750
Digital Temperature Interlock
