Greenheck 474750 User Manual
Document 474750
Digital Temperature Interlock
®
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!
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
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 preengineered 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.
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 8x8 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.
®
Digital Temperature Interlock
1
Table of Contents
0.75 to 0.875 inch
(19.0 to 22.2 mm)
diameter hole
Hood Surface
3 inch air space
19.525 inches
Sensor Install
(cutout area)
Exhaust Area
Supply Area
(optional)
P.O.BOX 410 SCHOFIELD, WI
TITLE
INSTR, ADJ. T
Installation
Product Specification ........................1
General Description ..........................1
Receiving and Handling .......................2
Installation
Hood Mounting .........................2-3
Duct Collar Mounting ......................3
Electrical Connections
Sensor Connections .......................3
Switch Connections to Control Box
or Fan Control Center ....................3
Circuit Connections .......................3
Calibration ...............................4
Factory Selected Parameters
Setting Parameters ....................3-4
Control Circuit Diagrams ....................5-6
Testing ...................................7
Operation ..................................7
Troubleshooting .............................7
Maintenance ...............................7
Frequently Asked Questions ...................8
Replacement Parts ..........................8
Codes and Standards Compliance ..............8
Our Commitment ............................8
Control Box Mounting
Locate an area with enough space to mount the control
box and fasten to the wall. Avoid installing the control
box in environments with high magnetic and/or radio
frequency interference.
NOTE
Control box may be factory mounted. If so, continue
to the next section.
Resistive Temperature Detector(s)
Hood Mounting
NOTE
Resistive temperature detector(s) may be factory
installed. If so, continue to the next section.
1. Locate flat area(s) at the top interior of the hood in
front of the filters, towards the front of the hood.
2 inch typical
Receiving and Handling
Upon receiving the equipment, check for both obvious
and hidden damage. Check to be sure that all parts of
the shipment, including accessories, are accounted for.
Make sure the equipment does not suffer any heavy
vibrations or knocks.
Storage
If a temperature interlock must be stored prior to
installation, it must be protected from dirt and moisture.
Indoor storage is recommended. For outdoor storage,
cover the control package with a tarp to keep it clean,
dry, and protected from UV (ultraviolet) radiation
damage.
Improper storage which results in damage to the unit
will void the warranty.
Top View of Exhaust Hood
2. Cut a 3/4 to 7/8-inch diameter
hole in the flat spot of the
capture tank. Make
sure the resistive
temperature detector(s)
will not interfere with fire
system nozzles and is
not within 12inches of
light fixtures.
3. Place the J-box plate inside of the octagon extension
ring and place over the hole.
4. Disassemble the compression seal and place
through hole and J-box plate as shown. Tighten the
nut inside the octagon extension ring.
Compression Seal
PN 463570
Gasket
Octagon Extension
PN 830125
Digital Temperature Interlock
2
J-Box Plate
PN 732396
Lock Washer
Nut
®
5. Place the resistive
temperature
detector through
the compression
Resistive Temperature
Detector (RTD)
PN 384925
seal and tighten
the compression
fitting.
6. Refer to Electrical
Connections
Octagon Extension
PN 830125
Octagon Cover
PN 380926
section for
instructions on wiring the temperature sensor.
7. Install the cover for the octagon box.
Resistive Temperature Detector(s)
Duct Collar Mounting
1. Locate the exhaust duct on top of the hood. A 3/4 to
7/8-inch (19.0 to 22.2 mm) diameter hole must be cut
into the duct 2inches
(50.8 mm) above the
hood top. Center the
hole along the side
of the duct. Make
sure that the resistive
temperature detector
will not interfere with
any fire system nozzles, or other items installed in
the exhaust duct. If an exhaust fire damper is present
the hood exhaust collar, it must be removed prior to
temperature sensor installation.
2. Place the J-box plate inside of the octagon extension
ring and place over the hole in the exhaust collar.
3. Disassemble the
compression
seal and place
through hole in
duct collar and
J-box plate as
shown. Tighten
the nut inside
the octagon
extension ring.
4. Place the
resistive
temperature
detector
through the
compression
seal and
tighten the
compression
fitting.
5. Refer to Electrical Connections section for
instructions on wiring the temperature sensor.
6. Install the cover for the octagon box.
All field installation and wiring of electrical equipment
must be done to meet NEC and local codes.
0.75 to 0.875 inch
(19.0 to 22.2 mm)
diameter hole
1/4-inch Compression Seal
PN 463570
Quik Seal
Gasket
Resistive Thermostat
Detector (RTD)
PN 384925
NOTE
Hood Exhaust Collar
Front Side
Octagon Extension
PN 830125
J-Box Plate
PN 732396
Lock Washer
Octagon Cover
PN 380926
Octagon Extension
PN 830125
2 inches
(50.8 mm)
Nut
Electrical Connections
Sensor Connections
1. Run two 18 awg stranded thermostat wires from
each temperature sensor to the appropriate electrical
circuit connections. (See Step 3 for connection
options).
2. In junction box, connect leads on RTD to the 18awg
conductors using appropriate size wire nuts.
• Wires are interchangeable with one another.
3. Choose
the final
connection
option
based on:
Do not connect temperature sensor in series with fan
power. This will result in damage to the temperature
sensor and will require replacement.
Separate as much as possible the probe and digital
input cables from inductive loads and power cables,
to avoid any electromagnetic disturbance. Never lay
power and probe cables in the same cable conduits
(including those for the electrical panel). Loosen
every screw and insert the cable end, next tighten
the screws and gently pull the cables to check their
tightness.
Switch Connections to Control Box or
Fan Control Center
Connect a Single Pole Single Throw (SPST) switch
to terminals S1H and S1. This is the same whether
temperature interlock is in a separate control box or
integrated in a kitchen fan control center.
Circuit Connections
1. Standard Interlock Control
• 120VAC, 10 or 15 amp circuit to terminals
H1 and N1
• 120VAC, 24VAC or other control circuit for fan
starter activation (factory separated from main
power connection shown in previous bullet)
- Control circuit power to terminal CP1
- Terminal CP2 to fan starter coils (hot)
2. Kitchen Fan Control Center Integration (KFCC)
• 120VAC, 15 amp circuit to H1 and N1 in fan
control center
- No additional control circuits are required
- Fan starters are factory-wired.
Sensor Terminals
First Sensor T1-A and T1-B
Others
(if applicable)
T2-A and T2-B
T3-A and T3-B
T4-A and T4-B
T5-A and T5-B
T6-A and T6-B
T7-A and T7-B
T8-A and T8-B
T9-A and T9-B
T10-A and T10-B
T11-A and T11-B
T12-A and T12-B
CAUTION
NOTE
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Digital Temperature Interlock
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