SummerAire SHRV2500DD Operation manual

HEAT RECOVERY VENTILATORS
INSTALLATION AND OWNERS OPERATING MANUAL
MODEL SHRV2500DD
DO NOT ATTEMPT INSTALING THIS HRV WITHOUT FIRST
READING THIS ENTIRE MANUAL
APPLICATION WARNING!!
CAUTION
Before installation, consideration must be given to how
this system will operate if connected to any other piece of
mechanical equipment, i.e. a forced air furnace or air
handler, operating at a higher static. After installation, the
compatibility of the two pieces of equipment must be
confirmed by measuring the airflow’s of the Heat
Recovery Ventilator (HRV) using the balancing procedure
found in this manual.
It is always important to assess how the operation of any
Heat Recovery Ventilator may interact with vented com-
bustion equipment.NEVER install a Heat Recovery
Ventilator in a situation where its’ normal operation
(including defrost function), lack of operation or partial
failure may result in the back drafting or improper func-
tioning of vented combustion equipment!
Summeraire Mfg.,
Peterborough, Ontario,
Canada, K9J 6X6.
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TABLE OF CONTENTS
PRODUCT SPECIFICATIONS ....................................................................3
INTRODUCTION..........................................................................................4
HRV SIZING CHART............................................................................5 & 6
INTRODUCTION..........................................................................................7
INSTALLATION INSTRUCTIONS..............................................................9
INSTALLATION METHODS............................................................12 & 13
PITOT TUBE AIR FLOW BALANCING ..................................................16
GENERAL OPERATING ............................................................................19
GENERAL MAINTENANCE ....................................................................21
WIRING DIAGRAM ..................................................................................22
PARTS LIST ......................................................................................23 & 24
TROUBLE SHOOTING GUIDE ................................................................25
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3
PRODUCT SPECIFICATIONS
NOMENCLATURE
MODÈLE SHRV2500DD 208 3 16 1/2
Model
Voltage
Phase
CFM Required (X 100)
Total External Static in Inches
ELECTRICAL BOX
BEHIND THIS
PANEL
WARM SUPPLY
COLD EXHAUST
WARM
EXHAUST
COLD SUPPLY
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4
MODELS AVAILABLE:
230/1/60 single speed 1 H.P.
208/230/460/575 3 phase single speed 1 H.P. and 2 H.P
Refer to Model selection table for capacities available.
MOTORS: Type ODP motors with sleeve bearings or fan cooled with ball
bearings depending on application. Available in 1hp or 2hp in various voltages
and phases including 208/230/460/575 3 phase and 230/1 phase..
CABINET:Cabinet is white powder coated 18ga. Galvanized with 2” foil
faced reinforced insulation. Includes six (6) Access Doors to service air filters,
drain pans, heat recovery cores and fan and motor assemblies.
HEAT RECOVERY CORE: Three (3) polypropylene cores located for easy
removal for cleaning.
BLOWERS: Belt Drive, double inlet, forward curved centrifugal
blowers.Painted housing and galvanized wheels.
FILTERS: Four (4) - 16 “ X 20 “ X 4 “ Pleated Disposable Air Filters
DEFROST: Damper defrost system is actuated when supply air temperature
entering HRV falls below preset temperature. This causes cold supply air to be
dampened off thereby passing ambient indoor air from the building over the
core for a 5-7 minute cycle until the core defrosts.
CONTROLS: Power On/Off is field supplied as a fused disconnect. Control
keypad on the unit gives several options including; Hi420 20 minutes of run
time on high speed, Intermittent ventilation repeating cycle of 20 minutes of
fan on followed by 40 minutes of fan off, Auto Off to put the unit into standby
off mode until activated to high speed ventilation by a remote device or a
Remote Push Button or Crank Timer. Standby mode, power to the main control
remains on but the Remote Devices are inactive, cold supply damper closes.
OPTIONAL REMOTE CONTROLS: Remote On/Off toggle switch, Crank
timers, Remote 20 minute Push Buttons (Maximum 6) and Dehumidistats.
CONDENSATION: Unit supplied with Drain Spigots and a Tee fitting. Drain
hose (5/8 inside diameter) to be field supplied.
MOUNTING: Indoor application only, fasten at four corners of unit using
field supplied threaded rod for ceiling suspension
SHIPPING WEIGHT: 750 pounds
NOTE: ALL WIRING MUST BE IN COMPLIANCE WITH ALL
NATIONAL – STATE – PROVINCIAL AND LOCAL CODES
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INTRODUCTION
The SHRV2500 series of Heat Recovery Ventilators (HRV’s) are designed for
commercial and industrial applications to provide fresh air to a building and
exhaust an equal amount of stale air. During the winter months, the incoming
cold fresh air is warmed by utilizing the heat recovered from the stale air before
it is exhausted to the outdoors. During the summer months, when the indoor air
space is air conditioned, the HRV will help in cooling the incoming fresh air
with the stale air that is being exhausted. Fresh air is distributed throughout the
building by way of the existing duct system or a dedicated duct system.
SELECT THE CORRECT SIZE HRV
Commercial and Institutional Requirements
ASHRAE has produced the Ventilation Standard 62-1989 that is used to
determine acceptable ventilation rates. This standard is referenced directly or
used as Good Engineering Practice in most Code documents or design criteria.
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Small Restaurants, Donut Shops & Fast Food Stores
Seats 4
Employees 5
Total 45
ASHRAE Requirements 20 cfm ( 10 L/s) per person
Ventilation Required 45 X 20 = 900 cfm ( 450 L/s)
Bar or Tavern
Seats 50
Employees 7
Total 57
ASHRAE Requirements 30 cfm ( 15 L/s ) per person
Ventilation Required 57 X30 = 1710 cfm ( 855 L/s )Salle de cours
Classrooms and School Portables
Seats 29
Teacher 1
ASHRAE Requirements 15 cfm ( 7.5 L/s ) per person
Ventilation Required 1 8 X 25 = 450 cfm ( 255 L/s )
Beauty Salon
Customers 12
Employees 6
Total 18
ASRAE Requirements 25 cfm ( 12.5 L/s ) per person
Ventilation Required 18 X 25 = 450 cfm (255 L/s )
Bank
Customers 25
Staff 9
Total 34
ASHRAE Requirements 20 cfm ( 10 L/s) per person
Ventilation Required 34 X 20 = 680 cfm ( 320 L/s )
Bingo Hall
Customers 180
Staff 20
Total 200
ASHRAE Requirements 30 cfm ( 15 L/s ) per person
Ventilation Required 200 X30 = 6000 cfm ( 3000 L/s )
Print Shop
Square Footage of Shop 2000 sq. ft.
ASHRAE Requirements 0.5 cfm / sq. ft. ( 2.5 L/s – m 2 )
Ventilation Required 2000 X 0.5 = 1000 cfm ( 500 L/s )
Swimming Pools
1 cfm per sq. ft. of the water surface area or
.5 cfm per sq. ft. of the water surface + deck area
Hot Tubs
7 – 10 cfm per sq. ft. of the water surface area
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MAKE – UP HEAT REQUIREMENTS @ 1200 CFM ( 566 L/s )
9
Outdoor Temp
°C °F
032
-10 14
-20 -4
-30 -22
-40 -40
Nominal
20 °C
(68 °F)
7
10
12
15
17
Nominal
25 °C
(77 °F)
10
14
15
19
21
Nominal
30 °C
(86 °F)
14
17
19
22
24
NOTE: ALWAYS REFER TO THE MOST RECENT VERSION OF
ASHRAE VENTILATION STANDARD TO DETERMINE CFM
REQUIREMENTS.
INSTALLATION INSTRUCTIONS
LOCATION
The HRV should be suspended from a supported ceiling ideally in a mechanical
room proximate to an outside wall to establish outside venting and weather-
hoods. This unit can only be mounted indoors and consideration should be give
to the location of available power and water drainage for the unit’s condensation.
When installing the unit, ensure that it is level and that adequate space is
allowed around the unit for easy accessibility into the access doors for service
and maintenance.
DUCT SYSTEM
The Duct System must be well designed to allow the HRV to operate at its’
maximum efficiency. It is very important the Duct System must be adequately
sized and includes no sharp radius bends or tees which will significantly
increase the pressure drop in the Duct System and reduce air flows.
Galvanized ducts must be sized for 1200 f.p.m. (6.09 m/s) maximum velocity;
this is recommended to avoid excessive pressure drop and noise. Ducting
should be as short as possible and use the minimum number of elbows and
tees. Connecting duct sections and shorter runs may be flexible ducting one
size larger than the metal duct. The use of flexible duct connectors at the HRV
will considerably reduce noise transmission. All duct joints must be secured
with screws, rivets or duct sealant and sealed with aluminum tape.
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DUCTING OUTSIDE
OUTSIDE WEATHERHOODS
The Outside Weatherhoods required for operation of the SHRV2500 HRV are to
be provided by the installing contractor. Weatherhoods must have built in bird
screens to prevent birds and rodents from entering the premise through the
ductwork. When designing and locating the fresh air intake, consideration
should be given to the best place where the hoods will gather the freshest air,
free from restriction.
We recommend:
• No less than 10 ft. (3 m) apart from each other.
• At least 18 in. (46 cm) above ground level or potential snow accumulation.
• Away from sources of contaminates, such as automobile exhaust fumes,
gas meters, garbage containers, cooling towers, etc.
• Not exposed to prevailing winds, wherever reasonably possible.
The outside perimeter of the weatherhoods must be caulked to prevent leakage
into the building. Roof vents must have adequate curb height for water protection
and to be sealed to the ducting.The design and size of the weatherhoods or
louvers chosen by the installer, must allow for adequate free area. Water and
snow penetration of the system is minimized when the airflow does not exceed
750 fpm (3.81 m/s) free area velocity.
WEATHERHOOD DUCTING
Galvanized metal ducting with sufficient cross section and with an integral
single piece vapor barrier should be used to connect to the HRV to the weather-
hoods. All ducting must meet ULC Class 1 Fire Rating and the minimum R-
value of the insulation should be equal to 4 (RSI 0.75), or as stated in local
codes.
All ducting must be well sealed to prevent air leaks and a sufficient bead of
high quality caulking (preferably acoustical sealant) and taping with a high
quality aluminum foil tape is recommended to seal the duct to both the HRV
and the weatherhoods.
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DUCTING WITHIN THE BUILDING
To reduce airflow restriction in the duct system, galvanized ducting should be
used from the HRV to different areas within the building whenever possible.
Also, to minimize airflow losses in the duct work system, all ducts should be as
short as possible and incorporate as few elbows as possible. The use of 45 º
elbows is preferred to 90 º elbows and Y tees instead of 90 º tees is also
recommended.
All duct joints must be fastened securely and wrapped with a quality duct tape,
such as aluminum foil tape, to prevent leakage.
NOTE: See Installation Warning under the “Integrated HVAC System” section.
STALE AIR (RETURN) DUCT SYSTEM
The Stale Air (Return) Duct System is used to draw stale air from the points of
the building where the worst air quality problems occur. Balancing dampers
and, or, adjustable grilles are recommended on all return air lines which are
used (during installation) to help balance the “draw” from different areas of the
building. Note that the installation schematics show balancing dampers and, or,
adjustable grilles on all return air lines coming back to the HRV. Please refer to
figs. 1-3 to view the various installation system options.
A balancing damper is required prior to the HRV to balance the stale air
exhausted with the fresh air supply entering the building.
Return air extraction points should be located at the opposite side of the room
to the fresh air inlet. The inlets may be located in the ceiling or high on the
walls and fitted with inlet grilles.
Many commercial activities produce air contaminates in the form of dusts,
fumes, vapors and gases. Contaminates should be controlled at the source so
that they are not dispersed through the building nor allowed to increase to toxic
concentration levels. The HRV allows for economical operation of the HVAC
system, while effectively removing contaminates from the space. In designing
the exhaust portion of the system, the exhaust grilles are placed so as to remove
the contaminates while not allowing them to enter the breathing zone of the
occupants.
For contaminates that are lighter than air, grilles should be located high on the
wall. If contaminates are heavier than air a lower placement of the grilles will
be required. Information on contaminates specific gravity and toxicity should
be available from the chemical data sheets.
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Dedicated Duct System
In this arrangement the HRV is installed with a dedicated duct system. All
applicable rooms are exhausted and provided with fresh air supply as required.
The main advantage of this type of installation is it provides the ability to
balance the exhaust and supply air streams for each serviced room. The HRV
system can also be operated independently of the forced air heating/cooling
system.
Please refer to fig. below.
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Indirect Duct System
This method of installation permits localized exhaust of indoor air and uses the
existing forced air system to distribute fresh air. This system will therefore per-
mit independent room balancing of exhaust stale air, however the distribution
of fresh supply air cannot be balanced.
In this system, the fresh air supply can either be directly connected through a
ceiling return air plenum into an air handler or directly into the return air duct
into the air handler. Once through the air handler, the air then moves into the
fresh air supply duct run.
Please see fig. below.
Simplified Duct System
This system is primarily used when it is impractical to install dedicated duct
runs from the HRV to various room of the building. In this installation the
warm air exhaust from the building to the HRV and fresh air supply from the
HRV to the building are connected to the existing force air duct system. This
installation has the exhaust stale air may drawn directly from the return air
duct.
When this system is used, the air handlers’ blower will need to operate con-
stantly when ventilation is required. The exhaust take-off connection must be at
least 1 meter (3.28 ft) away from a directly connected HRV supply duct if both
are connected to the same run.
Please see fig. below.
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SUPPLY AIR DUCT SYSTEM
The fresh air supply ductwork from the HRV may be directly connected to the
return air duct of the forced air system. When directly connected, it is recom-
mended that the air handler blower be in constant operation to move the fresh
air about the building (see warning under “The Integrated HVAC System”).
Also, it is advisable to include a short length fabric flex duct or other non –
metallic connector in this hard duct line in order to keep the HRV acoustically
isolated and separately grounded (electrically) from the air handler. This will
avoid a possible shock hazard to service people if a short to ground develops in
one of the devices. It may be necessary to install a separate fresh air supply
ductwork system if the heating is other than forced air.
When installing an HRV, the designer and installer should be aware of local
codes that may require smoke detectors and / or firestops in the HVAC or HRV
ductwork. Because an HRV is designed to bring fresh air into the building,
structures may require a supply voltage interrupt when fire or smoke or flame
sensors are triggered or central fire system is activated.
Supply air grilles may be ceiling or high wall mounted. Avoid incoming fresh
air grilles that could cause a direct draft on the occupants as the incoming air
may be below room temperature. A reheat duct heater can be installed to
improve occupant comfort. Information on electric or hydronic duct heaters is
commercially available.
INSTALLATION TIPS
1. Whichever method is chosen to operate the SHRV2500, keep in mind that
Air – to – Air exchangers are not “ booster fans ”, and are not normally
sized to ventilate at a steady rate. To achieve optimum performance from
the SHRV2500, the desired ventilation rate (speed of the system) should be
reached before the contaminant has reached its’ maximum.
2. It is recommended that backdraft dampers be installed in the supply and
exhaust ductwork to the outside, to prevent air from entering in through the
HRV when the HRV is OFF. Failure to install backdraft dampers may result
in damage to HVAC equipment and / or other building components.
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INTEGRATED HVAC SYSTEM
Increasingly, the HRV has become an integral component of the commercial
HVAC system. HRV’s are very versatile, being able to provide fresh air directly
to the return air plenum of a rooftop heat / cool unit or into a ceiling return air
plenum or directly into the ceiling space near the air handlers intake. Special
care and attention should be given if connecting this unit to any air handler or
other unit that may draw more than the SHRV25500 is designed to accommodate.
Installations where it is satisfactory to provide general exhaust from the space,
the air to be exhausted may be taken directly from the return air plenum to the
HRV as it is drawn back to the air handler. Fresh air supplied by the HRV is
then introduced directly into the return air plenum but at a location closer to the
air handler. The air handler would have a constant running blower to effectively
distribute the fresh air and remove the stale air. Balancing dampers would be
located in both the HRV supply and exhaust ducts between the return air
plenum and the HRV.
ELECTRICAL
The electrical characteristics available for the SHRV2500 are application spe-
cific. Refer to product specifications and nomenclature on page # 3.An external
disconnect must be installed prior to the HRV. This disconnect shall be turned
off and locked out before servicing the unit.
All electrical connections shall be made by a qualified, and where required by
law, a licensed electrician.
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PITOT TUBE AIR FLOW BALANCING
It is necessary to have balanced air flows in any HRV. The volume of air
brought in from outside must be equal to the volume of air exhausted by the
HRV. If the air flows are not properly balanced :
• The HRV may not operate at its’ maximum efficiency.
• A negative or positive air pressure may occur in the building.
• The HRV may not defrost properly.
• Failure to balance the HRV may void warranty.
Excessive positive pressure may drive moist indoor air into external walls of
the building where it may condense ( in cold weather ) and degrade structural
components. It may also cause key holes to freeze up.Excessive negative pres-
sure may have several undesirable effects. In some geographic locations, soil
gases, such as methane and Radon gas may be drawn into the building through
basement / ground contact areas. Excessive negative pressure may also cause
back drafting of atmospherically vented combustion appliances.
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Read the Application WARNING on the Front Page of This Manual.Prior
to balancing, insure that :
1. All sealing of the ductwork system has been completed.
2. All of the HRV’s components are in place and function properly.
3. Balancing dampers are open.
4. HRV is on High Speed.
5. Air flows in branch lines to specific areas of the building should be adjust-
ed first, prior to balancing the HRV. A smoke pencil used at the grilles is a
good indicator of each branch line’s relative air flow.
6. After taking readings of both the stale air to the HRV duct and fresh air to
the building duct, the lower CFM ( L/s ) velocity reading should be left
alone, while the duct with the higher reading should be dampered to match
the lower reading.
7. Return HRV to appropriate fan speed for normal operation.
17
BALANCING PROCEDURE
The following is a method of field balancing an HRV using a Pitot Tube,
advantageous in situations when air flow stations are not installed in the duct-
work. This procedure should be performed with the HRV on High Speed. The
first step is to identify the supply duct to the building and the return duct from
the building. Choose the straightest section of duct between the HRV and any
branches or take-offs.This will be for both the supply and return ducts.
Drill a small hole in the duct ( approx. 3/16” ) 3 feet downstream of any elbows
or bends, and 1 foot upstream of any elbows or bends. These are recommended
distances, but the actual installation may limit the amount of straight duct.
The Pitot Tube should be connected to a Magnahelic gauge or other manometer
capable of reading from 0.0 – 1.0 in. ( 0-500 Pa ) of water, preferably to 3 dig-
its of resolution. The Tube coming out of the top of the Pitot is connected to the
High Pressure side of the gauge. The Tube coming out of the side of the Pitot is
connected to the Low Pressure or reference side of the gauge.
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Insert the Pitot Tube into the duct, pointing the tip into the airflow.
More precise readings can be made by taking a number of readings through a
cross section of the duct. The readings should be taken at the centers of equal
areas in the duct.
This procedure is outlined in the instructions accompanying the Pitot Tube.
This method is also described in the ASRAE Handbook of Fundamentals,
chapter on measurements and instruments.
Determine which duct has the highest airflow ( highest reading on the gauge ).
Then damper that airflow back to match the lower reading from the other duct.
The airflows should now be balanced.
Actual airflow can be determined from the gauge reading. The value read on
the gauge is called the velocity pressure. The Pitot Tube comes with a chart that
will give the airflow velocity based on the velocity pressure indicated by the
gauge. This velocity will be in either feet per minute or meters per second.
To determine the actual airflow, the velocity is multiplied by the cross sectional
area of the duct being measured.
Example:
• This is an example for determining the airflow in a 6” duct
• The Pitot Tube reading was 0.025” W.C.
• From this chart, this is 640 f.p.m.
• The 6” duct has a cross sectional area
= ( 3.14X { 6”/12 } 2 ) /4 = 0.2 square ft.
• The airflow is then 640 ft / min. X 0.2 square ft. = 128 cfm
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GENERAL OPERATING INSTRUCTIONS
SUMMERAIRE SHRV2500 SERIES
HEAT RECOVERY VENTILATOR
ON / OFF SWITCH
The SHRV2500 series HRV’s are NOT supplied with an ON / OFF switch. The
HRV’ s in this series are direct connected to their power source through a field
supplied disconnect switch.
OPTIONAL REMOTE CONTROLS
Remote Dehumidistats, Timers, or switches can be easily installed to automati-
cally turn fan onto high speed.
AUTOMATIC DAMPER STYLE DEFROST
The automatic damper defrost is factory pre – set and normally does not
require adjustments. A temperature sensor, located in the fresh air supply
stream, activates and electronic timer when the outdoor temperature drops to –
3 º C (25 º F). This timer controls the timing cycles of the defrost system.
During the defrost cycle, the fresh air supply is shut off by the motorized multi
blade damper assembly for approximately 5 – 7 minutes, ambient air from the
building is designed to flow through the core assembly, melting any frost
accumulations.
CORE AND FILTER CLEANING
The core assembly and filters are removed via the hinged access doors located
on both sides of the HRV. By unscrewing the hex head screws that secure the
access doors these cabinet doors can be opened, allowing the core assemblies
and air filters to be removed from either or both sides of the HRV. Always use
care when handling the core assemblies. At re assembly, ensure that cores are
oriented properly, refer to THIS WAY UP and FILTERS THIS SIDE labels.
CLEANING
A visible inspection of the HRV should be made every 3 – 6 months. The core
assembly can be easily removed and cleaned by immersing in soapy water and
rinsing. The “ pleated “ type air filters can be removed and “ tapped “ to
remove excess dirt and dust and should be replaced annually, or as required.
These steps must be carried out to prevent any build – up of dust dirt etc.
Vacuuming the interior of the HRV may also be necessary annually. Also,
check the outside fresh air intake hood and the stale air exhaust hood, and
remove debris every 2 months. Do not let snow cover the outdoor weatherhoods.
CONDENSATE DRAINAGE
Periodically, inspect and clean the drip pan(s) and condensate hose. Check for
any blockage which may disrupt normal drainage.
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OPERATING INSTRUCTIONS SHRV2500 SERIES
SHRV2500 HRV’s ARE NOT SUPPLIED WITH
POWER DISCONNECTS.
20
DEFROST
DISPLAY
Hi4-20
INTERMITTENT
AUTO-OFF
HIGH SPEED
STANDBY
ACTIVATED WHEN INCOMING AIR
TEMPERATURE IS BELOW - 3 DEG
C ( 25 º F ). GREEN LED ILLUMI-
NATES WHEN HRV IS IN DEFROST
MODE.
HRV OPERATES HRV AT HI SPEED
FOR 20 MIN. THEN SWITCHES TO
FAN OFF
40 MINUTES OF FAN OFF FOL-
LOWED BY 20 MINUTES OF FAN
ON. THIS CYCLE REPEATS
FAN OFF UNLESS ACTIVATED BY A
CONTROL i.e. EXTERNAL DEHU-
MIDISTAT OR CRANK TIMER.
HRV OPERATES ON HIGH
SPEED CONTINOUSLY.
FAN OFF, PERIPHERALS DO NOT
RESPOND. CONTROL POWERED,
COLD SUPPLY DAMPER CLOSED.
Note: The default position of the main control board is FAN ON any time
that power is turned off to the HRV.
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