CADEXAIR Stadium Series User manual

Stadium hood Series
Maintenance & operation Manual
Version : V1.0

INTRODUCTION
Thank you for purchasing a Cadexair hood Stadium.The Sadium serie hood is ULC and
UL listed for use in a commercial kitchen exhaust system and Exhaust Cleaning
Assembly for Kitchen Exhaust Duct, such as the following articles:
- ULC-S646
- ULC-S647
The primary function of a Stadium Serie hood is to filter the grease, lint and dust
particles and remove the odor from the exhaust air.
The Underwriters Laboratories Inc. (UL) and Underwriters’ Laboratories of Canada
Limited (ULC) listings allow the kitchen exhaust air to be discharge to atmosphere at low
levels.
Prior to any installation the installer must seek approval from the authorities having
jurisdiction.
THE SYSTEM
The grease-laden air rises from the cooking equipment into a UL or ULC exhaust hood.
The exhaust hood removes some of the airborne grease particulate. Typically most
micron and submicron particles escape into the exhaust ductwork. The exhaust ducting
is connected from the hood to the inlet of the Stadium Serie. This exhaust ductwork
must be supplied and installed in accordance with the NFPA-96 code.
CONTROL CIRCUIT
Filter Clogged:
During normal operation of the Cadexair hood Stadium serie have three-filter stages
collect grease, dust, and lint particulate. The type of cooking equipment and the hours of
operation determines the useful life of the individual filters.
Pressure transducers determine when the filters are totally used and must be replaced.
As the filter reaches the grease loading capacity the static pressure across each filter
increases. When the maximum static pressure is reached the transducer activated a PLC
output. The exhaust fan shuts off, the “NORMAL” pilot energizes, and the kitchen remote
panel annunciates a filter-clogged condition. (The remote panel Cadexair CC-50 or CC-
200 indicates which stage of filters has clogged; PREFILTER, BAG FILTER, or BOX
FILTER.)

The clogged filter must be replaced and the system reset to resume normal operation. If
this condition occurs during normally operating hours rotate the OVERRIDE selector
switch and the fan will come back on. The systems can run in the OVERRIDE position for
about 4 hours. (See the section the OVERRIDE switch) If the system runs longer than 4
hours the fan will shut down. The filters must be changed and the system reset. It is
recommended that the filters be changed prior to the filter clogged light energizing. A filter
usage chart is attached to record when the filters are being changed. Using this chart a
regular maintenance schedule can be set up to ensure constant uninterrupted operation
of the commercial kitchen.
Filter Removed:
Should the bag or box filters be removed during normal operation the Cadexair Stadium
unit is automatically shutdown. A pressure transducer measuring static pressure across
the bag filters and box filters monitors a minimum pressure drop of 0.05” W.C. When the
filter is removed the pressure differential falls and the pressure switch is activated. The
exhaust fan shuts off, the “FILTER REMOVED” pilot light on the control panel energizes
and the screen of the PLC in the control panel has a text message indicating “FILTER
REMOVED/LOW EXHAUST. To resume normal operation the filter must be replaced and
the system reset. (See the section the OVERRIDE switch)
High Temperature:
In the event of a high temperature in the ductwork leading to the Stadium unit a firestat
located at the inlet of the Stadium unit filter section is activated. When the exhaust air
reaches 160 F the firestat is energized. The exhaust fan shuts off, the “NORMAL” pilot
goes off, and a “FIRE” pilot energizes on the control panel. Should the exhaust
temperaturecontinue torise thefusible linkmelts and closes thefire damperin the exhaust
discharge of the Stadium unit filter section. This fire damper is always located between
the fan andfilter section. Thefire damper fusible link is rated at 165 F. Shut off all cooking
equipment and notify thefire department. To resume normal operation, replace the fusible
link and reset the system.
Override Switch:
In the event that the filter clogged annunciation shuts off the Stadium unit during a peak
cooking time rotate the OVERRIDE SWITCH located on the control panel clockwise. The
WARNING pilot light will energize and the FILTER CLOGGED and NORMAL lights will
turn off. This is a temporary override to allow for the cooking equipment to be shut off
prior to changing the filters. The systems can run in the OVERRIDE position for 4 hours.
If the system runs longer than 4 hours the fan will shut down. The filters must be changed
and the system reset. It is recommended that the filters be changed prior to the filter
clogged light energizing. A filter usage chart is attached to record when the filters are
being changed. Using this chart a regular maintenance schedule can be set up to ensure
constant uninterrupted operation of the commercial kitchen. Once the dirty filter has been

replaced rotate the OVERRIDE SWITCH to counter clock wise to resume normal
operation.
MXFLOW OPTION
.
INCREASING FILTER LIFE
MXFLOW is designed to increase filter life while maintaining maximum exhaust volume
during the commercial kitchen cooking operation. Immediately after commissioning the
Stadium unit the exhaust air volume is at the highest level. As each of the three filter
banks captures grease particulate of micron and submicron size they begin to fill and the
air resistance through each filter increases. Even though the Stadium unit has a heavy
duty, Class II, backward inclined fan the increase in combined resistance (static pressure
“W.C.) through each filter will gradually reduce the exhaust volume. In cases where there
is very heavy cooking with largequantities of micron and submicrongreaseparticulate the
reduced exhaust volume is most noticeable. In some cases, the filters may have to be
changed not because the filter is clogged but because the combined static pressure
resistance through all the filters has reduced the exhaust volume enough to affect smoke
capture. This is less of a problem with lighter cooking operations.

In the example above the “No MXFLOW” Stadium unit exhaust volume (shown in BLUE)
gradually drops as the filters become increasingly clogged. Even when the prefilters and
bag filters are replace the exhaust volume does not return to maximum because the box
filter continues to clog. This drop in exhaust volume generally only represents about 10%
of the total exhaust volume. But in some cases this can be enough to affect the hoods
ability to capture smoke adequately. The “MXFLOW” Stadium unit incorporates a
combination pressure transducer/microprocessor and variable speed drive to maintain
constant exhaust volume regardless of the increased static pressure through any of the
particulate filters. As the pressure across any filter increases and the exhaust volume
decreases the pressure transducer/microprocessor senses this change and automatically
increases the exhaust fan speed to compensate for this increased static pressure to
maintain a constant exhaust volume.
MAXFLOW also allows for one touch exhaust volume adjustment when commissioning
the unit; thereby making commissioning a more straightforward process. Additionally,
MAXFLOW eliminated the nee to change sheaves. If the exhaust volume has to be field
adjusted because of an appliance change or ductwork change the MXFLO provides
automatic exhaust volume adjustment, up or down, with the touch of a single button.
Operation
As a filter clogs, the pressure drop through the filter increases, decreasing the exhaust air
volume, and decreasing the static pressure measured at the PT. The PT sends a signal
to the DMP to increase the static pressure back to the set point by increasing fan speed.
The result is a constant exhaust volume until the filters are full and must be replaced.
CHECKING FAN ROTATION
Fan rotation should be checked prior to commission the system. Turn the fan selector
switch in to the off position. Turn on the circuit breaker powering the unit. The backward
inclined fan must be running backwards such that the fan blades pushing the air from the
back of the blade. If the fan is scooping the air change the fan rotation. To correct fan
rotation switch two of the high voltage wires on terminals V/T1, U/T2 or W/T3 on the drive
or switch two wires at the motor. SHUT OF ALL POWER TO THE UNIT BEFORE
CORRECTING ROTATION

WHEN TO CHANGE THE KES FILTERS
The Prefilter, Bag filter and Box filter must be changed on a regular basis to maintain the
high grease extraction efficiency required by the UL/ULC listing. Once a filter clogged
light comes on the filter has reached its grease holding capacity. Further use will restrict
exhaust air flow causing hood smoke capture problems and/or cause the clogged filter to
blow out into the next filter or the exhaust fan. Therefore the three particulate filters must
be changed before the Filter Clogged lights activate and shut the unit down under normal
kitchen operation. This will provide simple uninterrupted operation for your commercial
kitchen operation.
Determine the Filter Change Schedule
When the STADIUM unit is turned over to you by the installing contractor immediately
change the Prefilters. The Prefilters will probably be full of construction debris and this
debris will effect the initial operation of the unit.
PREFILTERS
1. Enter the startup date on the attached FILTER FREQUENCY CHART. This is the date
the Prefilters were changed as well.
2. Run the unit until the Prefilter Clogged lights turns on. When the light comes on the unit
will shut down. Immediately turn the Override switch clockwise and put the unit into
override. The unit will come back on. Change the prefilters at the end of the shift or the
next day before cooking. Write the date that the Prefilters were changed on the FILTER
REQUENCY CHART under Filter Change No. 1/Actual.
3. Determine the number of days between the Startup date and the Prefilter Change No.
Actual date. Subtract two days from this number. Add the this number of days to the last
actual prefilter change and enter this new prefilter schedule date in the sche dule under
Filter Change No. 2/Schedule. Change the Prefilters on this new date. If the Filter light
activates before this new date reduce the number of days to the next scheduled change
by one day.
BAG FILTERS
1. Run the unit until the Bag Filter Clogged lights turns on. When the light comes on the
unit will shut down. Immediately turn the Override switch clockwise and put the unit into
override. The unit will come back on. Change the Bag filters at the end of the shift or the
next day before cooking. Write the date that the Bag filters were changed on the FILTER
REQUENCY CHART under Filter Change No. 1/Actual.

2. Determine the number of days between the Startup date and the Bag filter Change No.
Actual date. Subtract two days from this number. Add the this number of days to the last
actual bag filter change and enter this new bag filter schedule date in the schedule under
Filter Change No. 2/Schedule. Change the bag filters on this new date. If the Filter light
activates before this new date reduce the number of days to the next scheduled change
by one day.
BOX FILTERS
1. Run the unit until the Box Filter Clogged lights turns on. When the light comes on the
unit will shut down. Immediately turn the Override switch clockwise and put the unit into
override. The unit will come back on. Change the Box filters at the end of the shift or the
next day before cooking. Write the date that the Box filters were changed on the FILTER
REQUENCY CHART under Filter Change No. 1/Actual.
2. Determine the number of days between the Startup date and the Box filter Change No.
Actual date. Subtract two days from this number. Add the this number of days to the last
actual box filter change and enter this new box filter schedule date in the schedule under
Filter Change No. 2/Schedule. Change the box filters on this new date. If the Filter light
activates before this new date reduce the number of days to the next scheduled change
by one day
By following the above procedure you will maximize your filter life. Changing the prefilter
prior to clogging improves the bag filter life and changing the bag filter prior to clogging
improves the box filter life.
Table of max pressure filter operation
Filter
Flow %
Max.
Value
Flow %
Max.
Value
Flow %
Max.
Value
Prefilter
100
960
90
864
80
768
Bag Filter
100
1440
90
1300
80
1150
Box Filter
100
1920
90
1730
80
1540
Max Value = Maximum pressure drop in inch of water for filter type. (960 = 0.96'' h2o)
Flow % = The % of use of the unit. (EX : 3200 CFM on a unit of 4000 CFM give 80% Flow %)

The Flow % is a value that need to be set at the start-up in the CC50 or CC200 controller.
To have your exact Max. Value, you need to multiply the Max Value when the Flow % =
100, with the real Flow % of the operational system.
EX : Flow % = 3200 CFM/ 4000 CFM = 80 %.
Max Value Bag filter = 144 x 80% = 115 = 1.15'' h2o.
REPLACEMENT FILTER EQUIVALENTS
PREFILTERS: MERV7 (30% ASHRAE 52-76) - ULC Class II
American Air Filter:
24” x 24” x 2” - AM-AIR Class II
12” x 24” x 2” - AM-AIR Class II
BAG FILTERS: MERV15 (90 - 95% ASHRAE 52 –76) - ULC Class II
American Air Filter:
24” x 24” x 21” - DRI-PAK - Class II
12” x 24” x 21” - DRI-PAK - Class II
BOX FILTERS: MERV16 (95% DOP/99% ASHRAE 52-76) ULC Class II
American Air Filter:
24” x 24” x 12” - BIOCELL Class II
12” x 24” x 12” - BIOCELL Class II Farr Filter:
ODOR MEDIA: 1/8” Activated alumina pellets impregnated with potassium
permanganate.
American Air Filter: Permasorb

KES MAINTENANCE SCHEDULE
Every two weeks:
1. Consult the CC50 or CC200 screen to check the pressure reading for each type of
filter and check the difference with the maximum pressure differential for each filter (see
table of max pressure filter operation). It is very important to maintain clean prefilter(s).
Replacing the inexpensive prefilter(s) often extends the life of the bag and box filters and
reduces unnecessary down time due to clogged filter shutdowns. The CC50 or CC200
control screen will indicate separately when the “prefilter”, “bag” and “box” filters are
clogged. When this occurs the unit shuts down. Press the override button to energize
the system for another 4 hours. This provides time to change the filters after the day of
cooking is complete. This is a final dirty filter alarm after the red dirty filter warning. The
filter life of all the filters is constant for each operation. Once the approximate filter life for
your application is determined we recommend that a regular filter change schedule be set
up before the filter clog activates.
NOTE : An option of a dry contact is available to send a pre-alarm to the building
management system to alert that one of the filter is almost clogged
Every Month:
1. Complete the two-week list.
2. Inspect the exhaust fan belt for correct tension and wear. All belts usually require
adjustment at this time. Failure to tighten may result in the belt falling off and no airflow.
3. Check the bag filter (2nd stage filtration) pressure reading. If the bag filter bar graph is
red replace the bag filter. The life of the bag filter depends on the type of cooking
equipment and exhaust hood system. For heavy cooking applications the bag filters may
require replacement every month.
4.(Odor Spray Option) Inspect the odor spray bottle. Refill if necessary. At Startup he
odor spray is adjusted to the desired level. The amount of odor spray used varies with
this initial setting. It is important to inspect the level in the bottle every two weeks until the
normal rate of use is determined.
Every Three Months:
1. Complete the two-week and monthly checklist.
2. Inspect the exhaust fan belt for correct tension and wear. Adjust if necessary. 3. Check
the box filter (3rd stage filtration) pressure reading. If the box filter bar graph is red replace
the box filter. Once again, the life of the box filter depends. on the type of cooking
equipment and exhaust hood system. The box filter may provide one year of service on
most applications with high efficiency water wash ventilators.

4. Inspect all electrical connections. Tighten if necessary.
5. Test the filter-removed circuit. Open the prefilter access door while the STADIUM unit
is in operation. The unit should shut down and indicate a filter-removed condition.
Every Six Months:
1. Complete the two-week, monthly and three month check list.
2. Open the fan wheel access door or hatch on the fan section. Inspect the fan wheel for
grease build up. Clean as required.
3. Inspect the exhaust inlet fire damper and fusible link. Replace link annually.
4. Check the motor and fan bearings for noise or overheating. STY and FYC bearings are
factory pre-lubricated lifetime sealed and require no further lubrication. SY and FY
bearings are pre-lubricated and equipped with pressure grease fittings for re-greasing.
Under normal service conditions grease after six months of operation.
5. (Odor Pellet Option) Inspect the condition of odor media.
6. The odor media pellets can be checked for remaining life by sending a sample to an
accredited test laboratory. Most major filter suppliers have access to such service.
Replace media if required. To replace the media, remove the cells from the STADIUM
unit. Open the side panel on each odor cell and pour out the used media. Refill the cells
with new media. Shake cells while filling to allow pellets to settle evenly in the cell. Note:
Do not allow odor media to come in contact with water, as this will immediately render the
pellets useless.
Every Year:
1. Complete the two-week, monthly, three month and six-month check list.
2. Check if fan motor is running hotter then normal. If the motor running hot check the
operating AMPS of the motor.
3. Make sure the fan wheel rotates freely before start-up. Inspect and clean the wheel
periodically. If dirt is allowed to build up the wheel could become out of balance and cause
premature bearing wear.
Fan Bearings
1. STY and FYC bearings are factory pre-lubricated lifetime sealed and require no further
lubrication.
2. SY and FY bearings are pre-lubricated and equipped with pressure grease fittings for
re-greasing.
3. Under normal service conditions grease after six months of operation.

Motor Bearings:
1. All motors leave the factory with bearings custom greased for many years of service
under most conditions.
2. Re-greasing of motors depends on the application and is best left to trained service
technicians.
3. Periodically check if motor is running hotter then normal.
Centrifugal Exhaust Fan:
1. Make sure the wheel rotates freely before start-up.
2. Inspect and clean the wheel periodically.
3. If dirt is allowed to build up the wheel could become out of balance and cause premature
bearing wear.
4. A noisy fan is a typical sign of a fan out of balance.
V-Belt Drives:
1. ALWAYS KEEP SPARE SET OF BELTS. Periodically check the belt tension and adjust
if necessary.
2. Some slack should be left in the belt, typically 1/4” per foot of belt from the fan to the
motor sheave.
3. Always replace the complete set of belts to ensure even tension and wear. When
replacing belts loosen the motor mounts.
4. Do not force belts over sheaves.
RECOMMENDATION TO ENSURE TROUBLE FREE OPERATION FOR YOUR
KITCHEN EXHAUST SYSTEM A PROPER PREVENTATIVE MAINTENANCE
PROGRAMIS NECESSARY. SPRING AIR RECOMMENDS THAT A YEARLY SERVICE
CONTRACT BE SET UP WITH A REPUTABLE SERVICE ORGANIZATION. THIS WILL
REDUCE UNEXPECTED DOWN TIME TO A MINIMUM.