Spring Air Systems DN REV-LOW Operating and maintenance manual

DN REV-LOW
Maintenance and
Operating Manual
___________________________
Spring Air Systems Inc., Oakville, Ontario
Phone [phone], Fax [phone], [email protected]
www.springairsystems.com

DN REV-LOW Maintenance and Operating
Manual
Table of Contents
Introduction 1
Spring Air Systems Hood Model Number Designations 2
Principle of Operation 2
VARIFLOW Baffles 3
Baffle Settings 4
REV-LOW Maintenance Instructions 4
Cleaning the Exterior 6
REV-LOW Maintenance Schedule 6
Trouble Shooting 6
Measuring the Exhaust Airflow 7
Installing the Terminator Baffle 8
REV-LOW-Startup Report 9

DN-Rev-LOW Maintenance and Operating Manual 1
DN REV-LOW Maintenance and Operating Manual
ULC/UL Listed Exhaust Hood without Exhaust Fire Damper
INTRODUCTION
Thank you for selecting a SPRING AIR SYSTEMS INC. Commercial kitchen exhaust Rev-Low
dry extractor. Your system consists of a dry extractor, exhaust fan and on/off switch. Others may
have supplied the exhaust fan and on/off operator.
Your SPRING AIR SYSTEMS INC. Dry extractor model was selected to best meet the design
requirements of your commercial kitchen application.
The DN series dry ventilator is a UL/ULC listed “Exhaust Hood without Exhaust Fire Damper”.
Typical SPRING AIR SYSTEMS Dry Rev-Low Ventilator Installation
Figure 1
An ON/OFF selector switch located in the kitchen area or mounted on the exhaust fan starter coil
electrical enclosure normally controls the exhaust fan.

DN-Rev-LOW Maintenance and Operating Manual 2
SPRING AIR SYSTEMS HOOD MODEL NUMBER DESIGNATIONS
There are numerous types and styles of SPRING AIR SYSTEM Rev-Low ventilator available.
Refer to the UL/ULC label for the complete model number and exhaust flow requirement for your
dry ventilator. The UL/ULC label is located on the underside of the grease through on the right
hand side of the dry ventilator.
SPRING AIR SYSTEMS HOOD MODEL NUMBER DESIGNATIONS
D N B-F MP 10 4
D Dry Grease Extractor
N No exhaust fire damper
D Fusible link, dead weight fire damper
B-F Box type rev-low hood
MG Make up air through front grilles
MP Make up air through perforated panels
MC Make up air down discharge through perforated
MR Make up air through rear wall plenum
10 The length of the ventilator in feet
4 The width of the ventilator in feet
Model Number Designation - Ventilators
Chart No1
PRINCIPLE OF OPERATION
A commercial kitchen cooking line consists of many different appliances depending on the type of
restaurant or institution. In every commercial kitchen the cooking vapors that comprise of grease,
smoke, and products of combustion rise
off the cooking surface. Natural
convection forces drive the cooking
vapors up towards the back wall as
shown in figure 2. The kitchen dilution
air is entrained into the cooking vapors
and the air mixture generally follows the
profile of the back and top of the hood.
The mixture of grease, smoke, products
of combustion, lint, dirt and kitchen
dilution air proceed along the roof of the
hood and follow a path down towards
the core extractor slot (the core
extractor slot extends along the length
of the hood). Most of the air mixture
enters the slot and a small amount rolls
back into the hood canopy to meet the
main air stream again.
TheREV LOW Hood Model DN-B-F
Figure2
Optimizing the amount of air mixture that enters the core extractor slot is the key to the REV LOW
system. The REV LOW hood must incrementally maximize the amount of the air mixture that
enters the slot and minimize the amount of roll back into the canopy as the total amount of the air
mixture deviates along the length of the cooking lineup.
Back wall of hood
Optional 3" aiir space
Roof of hood
Core Extractor
Exhaust Air
Vapours from appliances
APPLIANCES
Front of hood
Kitchen dilution air
Variflow baffle

DN-Rev-LOW Maintenance and Operating Manual 3
VARIFLOW Baffles
Section View of Core Extractor for DN-B-F REV LOW Hood
Figure 3
The REV LOW accomplishes this complicated process with a unique core extractor profile that
contains a series of specially designed VARI-FLOW baffles located along length of the core
extractor. See Figure 3 above. The VARI-FLOW baffles are adjusted prior to shipment to allow
the optimum amount of the air mixture to enter the core extractor slot and thereby minimize roll
back into the hood canopy. For instance the VARI-FLOW baffles located above a Charbroiler are
opened to the maximum 450 CFM/ft position and the VARI-FLOW baffles located above ovens or
steamers are closed to the minimum 90 CFM/ft position. This variable adjustment along the
length of each hood provides an exhaust system that truly minimizes the amount of exhaust air to
properly ventilate any kitchen line up.
Section View of REV LOW Extractor with Detail of Vari-flow Baffle
Figure 4
End mullion
Removable Inserts
Core extractor slot
Core extractor slot
Shown in full open position
Exhaust duct collar
Top of core extractor
Variflow Baffle
Front of core extractor
Grease trough
Drain connection
Exhaust duct collar
Baffle Partially Closed
Roof of hood
Baffle Closed
Back of hood
Baffle Opened
Front of hood
Variflow Baffle
Core extractor
Back Wall

DN-Rev-LOW Maintenance and Operating Manual 4
BAFFLE SETTINGS
Vary-flow Baffle labeling
Figure 5
Each baffle is factory set base on the type of appliance under the hood.
REV-LOW MAINTENANCE INSTRUTIONS
Hood with Spring Air Systems RPD Controller
At the start of the day
1. Rotate the occupied/Unoccupied switch to the occupied position to start the exhaust system.
The exhaust fan(s) will turn on and after a minute time delay the supply unit(s) will turn on.
2. Check each hood for air movement in the slot. Put your hand up to the entrance of the slot
and feel if there is air movement. The air movement should feel the strongest over the heavy
appliances. (broilers)
Check Air Flow in slot Wiping Interior of Hood
3. If there is no air movement check if the green fan light on the Spring Air remote panel is on (If
not check the breaker panel or fuse), check if the motor starters have pulled in (Press the red
reset button), and finally check fan belts in exhaust fan(s) on the roof. Then call a
serviceman.
4. Go to the makeup air diffusers and check for air movement from the supply unit. If no air
movement check, motor starter (push red reset button), check fan belts on unit on roof, call a
serviceman.
5. Check that all the grease inserts are in the hoods and installed properly.

DN-Rev-LOW Maintenance and Operating Manual 5
At the end of the day
1. After the cooking equipment has been turned off rotate the occupied/Unoccupied switch to
the unoccupied position to shut off the exhaust system. The exhaust and supply fan(s) will
shut down.
2. The REV-LOW hood will deposit particulate on both the hood backwall and roof. Wipe down
the stainless steel backwall above the appliances and the interior of the hood, including the
back and roof. Use a recognized hood degreaser. Wipe down the underside of the grease
trough. This is located directly above the cooks’ head.
Empty Grease Cup Steam Clean Interior
At the end of every other cooking day
1. Empty the grease cups located under the grease trough.
2. Remove the grease inserts and wash in a dishwasher or pot sink. . Use a recognized hood
degreaser and clean to bare metal.
3. Replace the insert in the hood.
At the end of the cooking day every six months
1. After removing the grease inserts for cleaning check the position of the Variflow Baffles in the
hood. The Variflow Baffles should be open over the heavy equipment and closed over the
lighter equipment. (Baffles should be wide open over charbroilers and closed over ovens.
2. Steam clean the interior of the grease extractor
Inspect Baffle Positions Check Baffle Setting
3. Go to the roof and check the condition of the exhaust fan and makeup air fan belts. Tighten
or replace as necessary.
4. Replace the makeup air filters. (Filter replacement times will vary with location of the
restaurant)

DN-Rev-LOW Maintenance and Operating Manual 6
CLEANING THE EXTERIOR
Normal soil can be removed with a mild detergent and water mixture applied to a cloth. To
remove baked on grease, apply a cleanser to a damp cloth or sponge and rub on the metal in the
direction of the polishing lines. DO NOT RUB IN A CIRCULAR MOTION.
Burnt deposits, which do not respond, can usually be removed by rubbing the surface with a
SCOTCH-BRITE scouring pad of STAINLESS scouring pads. DO NOT USE ORDINARY STEEL
WOOL. Heat tint can be removed by a vigorous scouring in the direction of the polish lines using
a SCOTCH BRITE of STAINLESS scouring pad in conjunction with a powdered cleanser.
REV-LOW MAINTENANCE SCHEDULE
DAILY:
1.At the end of the cooking day wipe off the interior and exterior of the dry ventilator canopy
and the underside of the grease trough with damp clothe.
WEEKLY:
1.Remove the grease inserts and wash in a mild detergent and water mixture.
2.Cleaning the Hood Exterior
Cleaning the Hood Exterior
Figure 7
Wipe off the interior of the dry ventilator plenum behind the grease extractor inserts and the
interior and exterior of the grease trough. Remove the grease cup and clean if necessary.
SIX MONTHS
1.Check the exhaust fan belts for alignment, tighten, and wear. Adjust an/or replace.
2.Inspect the fusible link fire damper. Clean and/or replace the fusible link if necessary.
TROUBLE SHOOTING
Low air (i) Improper exhaust fan rotation.
(ii) Broken or slipping belt.
(iii) Exhaust ductwork inspection door open.
(iv) Obstruction in the ductwork.
(iv) Flow-flow baffle must be adjusted
No Air (i) Broken belt.
(ii) Exhaust fan overload tripped.
(iii) Exhaust fan disconnect open.
(iv) Exhaust fan motor fuse blown.
(v) Fire damper closed.
(v) Check if baffles are upside down in extractor.

DN-Rev-LOW Maintenance and Operating Manual 7
MEASURING THE EXHAUST AIRFLOW
The exhaust air is measured along the inlet slot of the ventilator. To ensure accurate results take a reading every foot
along the length of the ventilator is recommended.
VANAXIAL VELOMETER
Hold the
instrument
perpendicular to
the VORTEX
BAFFLE and
parallel to the
throat (inlet slot) of
the ventilator.
Velometer should
not exceed three
inches in
diameter.
Measuring Exhaust Air
Figure 8
PITOT TUBE OR ANEMOMETER
Hold the instrument
perpendicular to
the VORTEX
BAFFLE and
parallel to the
throat (inlet slot) of
the ventilator. Take
three readings
across the throat
and average the
results.
Measuring Exhaust Air
Figure 9
Calculating the Exhaust Air
Calculate the average velocity across the inlet slot and refer to the chart below for the
corresponding CFM/ft (l/s/m).
Ventilator Type Velocity Exhaust Air Volume
Fpm m/s CFM/ft l/s/m
DN-B-F/DN-DI 450 2.3 100 140
DN-B-F/DN-DI 675 3.4 150 210
DN-B-F/DN-DI 900 4.6 200 275
DN-B-F/DN-DI 1125 5.7 250 340
DN-B-F/DN-DI 1350 6.9 300 410
DN-B-F/DN-DI 1575 8.0 350 480
DN-B-F/DN-DI 1800 9.2 400 550
DN-B-F/DN-DI 2000 10.2 450 620
DN-B-F/DN-DI 2250 11.5 500 690
DN-B-F/DN-DI 2450 12.5 550 755
Chart 1
HANDLE IS UP AND OUT
CORRECT UP SIDE DOWN
REMOVEABLE INSERT INSTALLATION

Dry Extractor Maintenance and Operating Manual
8
INSTALLING THE TERMINATOR BAFFLE
The TBDD Terminator baffle is available in various lengths to suit adverse site
conditions. This will provide additional exhaust air over heavy appliances that
are being effected by the surrounding environment.
Installation:
Remove the TBDD from the packing material. Take off all of the Removable Access Doors “A” from the hood. You
should be able to clearly see all the adjustable baffles “B” and their settings. Ensure that the adjustable baffle(s) “B” over
the heavy appliance is set at 5. The TBDD baffles “C” are going to be installed on the adjustable baffles “B” over the light
appliances. To install the TBDD baffle “C” onto the adjustable baffle “B” simply line up the gap on the TBDD baffle “C”
with the lower end of baffle “B”. Tap the TBBD along the length until it is snug on baffle “B”. If the fit is loose remove the
TBBD baffle “C” and gently tap the gap with a hammer in the middle and at each end. Re-attach to baffle “B”.
Install these baffles on the two adjustable baffles “B” located on the right or left side of
the charbroiler (when looking from the front of the hood).
3.0"
TERMINATOR BAFFLE FOR DD-B-F BAFFLE
MODEL TBDD-3
CROSS SECTION OF DD-B-F HOOD
ADJUSTABLE BAFFLE "B" 0.625"
TERMINATOR BAFFLE "C"
REMOVEABLE ACCESS "A"
GAP
INSTALLER CAN FLATTEN WITH HAMMER
BAFFLE ONTO THE ADJUSTABLE BAFFLE
LEAVE GAP LOOSE ENOUGH TO SLIP
TO TIGHEN FIT ON SITE.

Dry Extractor Maintenance and Operating Manual
9
REV-LOW- STARTUP
REPORT
General Information
Job Name
Date
Customer
Location
Spring Air Service
Exhaust Fan Model No.
Manufacturer
Up blast Discharge yes no
Exhaust Fan HP
Exhaust Air Design (CFM)
Supply Air Design (CFM)
Ventilator mounting Height
from finished floor to front of hood
Make Up Air Systems Good Fair Poor None
Hood Item
Model Length
Width No. of Baffles
Baffle Size *Design CFM
Baffle No.
Left to Right
Baffle Setting Velocity Reading
(fpm)
Calculated Exhaust Volume
per Baffle (CFM) **
1
2
3
4
5
6
Total Exhaust Measured CFM
Design Exhaust CFM
Hood Item
Model Length
Width No. of Baffles
Baffle Size *Design CFM
Baffle No.
Left to Right
Baffle Setting Velocity Reading
(fpm)
Calculated Exhaust Volume
per Baffle (CFM) **
1
2
3
4
5
6
Total Exhaust Measured CFM
Design Exhaust CFM

Dry Extractor Maintenance and Operating Manual
10
Hood Item
Model Length
Width No. of Baffles
Baffle Size *Design CFM
Baffle No.
Left to Right
Baffle Setting Velocity Reading
(fpm)
Calculated Exhaust Volume
per Baffle (CFM) **
1
2
3
4
5
6
Total Exhaust Measured CFM
Design Exhaust CFM
Hood Item
Model Length
Width No. of Baffles
Baffle Size *Design CFM
Baffle No.
Left to Right
Baffle Setting Velocity Reading
(fpm)
Calculated Exhaust Volume
per Baffle (CFM) **
1
2
3
4
5
6
Total Exhaust Measured CFM
Design Exhaust CFM
Hood Item
Model Length
Width No. of Baffles
Baffle Size *Design CFM
Baffle No.
Left to Right
Baffle Setting Velocity Reading
(fpm)
Calculated Exhaust Volume
per Baffle (CFM) **
1
2
3
4
5
6
Total Exhaust Measured CFM
Design Exhaust CFM

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Phone: [phone], FAX: [phone], e-mail [email protected]
www.springairsystems.com