Greenheck MiniVent User Manual

Page 1

Document 459023

Model MiniVent

Energy Recovery Ventilator

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!

Energy recovery wheels are certiﬁed by the AHRI Air-to-Air Energy Recovery Ventilation Equipment Certiﬁcation Program in accordance with AHRI Standard 1060. Actual performance in packaged equipment may vary.

Certiﬁed Ratings are available in the Certiﬁed Product Directory at www.ahridirectory.org

General Safety Information

Only qualiﬁed personnel should install this system. Personnel should have a clear understanding of these instructions and should be aware of general safety precautions. Improper installation can result in electric shock, possible injury due to coming in contact with moving parts, as well as other potential hazards. Other considerations may be required if high winds or seismic activity are present. If more information is needed, contact a licensed professional engineer before moving forward.

DANGER

Always disconnect power before working on or near this equipment. Lock and tag the disconnect switch or breaker to prevent accidental power up.

CAUTION

When servicing the unit, the internal components may be hot enough to cause pain or injury. Allow time for cooling before servicing.

CAUTION

Precaution should be taken in explosive atmospheres.

1. Follow all local electrical and safety codes, as well as the National Electrical Code (NEC), the National Fire Protection Agency (NFPA), where applicable. Follow the Canadian Electrical Code (CEC) in Canada.

2. All moving parts must be free to rotate without striking or rubbing any stationary objects.

3. Unit must be securely and adequately grounded.

4. Do not spin fan wheel faster than maximum cataloged fan RPM. Adjustments to fan speed signiﬁcantly affects motor load. If the fan RPM is changed, the motor current should be checked to make sure it is not exceeding the motor nameplate amps.

5. Do not allow the power cable to kink or come in contact with oil, grease, hot surfaces or chemicals. Replace cord immediately if damaged.

6. Verify that the power source is compatible with the equipment.

7. Never open access doors to the unit while it is running.

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Receiving

Upon receiving the product check to ensure all items are accounted for by referencing the delivery receipt or packing list. Inspect each crate or carton for shipping damage before accepting delivery. Alert the carrier of any damage detected. The customer will make a notation of damage (or shortage of items) on the delivery receipt and all copies of the bill of lading which is countersigned by the delivering carrier. If damaged, immediately contact your Greenheck Representative. Any physical damage to the unit after acceptance is not the responsibility of Greenheck Fan Corporation.

Unpacking

Verify that all required parts and the correct quantity of each item have been received. If any items are missing, report shortages to your local representative to arrange for obtaining missing parts. Sometimes it is not possible that all items for the unit be shipped together due to availability of transportation and truck space. Conﬁrmation of shipment(s) must be limited to only items on the bill of lading.

Handling

Units are to be rigged and moved by the lifting brackets provided or by the skid when a forklift is used. Location of brackets varies by model and size. Handle in such a manner as to keep from scratching or chipping the coating. Damaged ﬁnish may reduce ability of unit to resist corrosion.

Storage

Units are protected against damage during shipment. If the unit cannot be installed and operated immediately, precautions need to be taken to prevent deterioration of the unit during storage. The user assumes responsibility of the unit and accessories while in storage. The manufacturer will not be responsible for damage during storage. These suggestions are provided solely as a convenience to the user.

INDOOR — The ideal environment for the storage of

units and accessories is indoors, above grade, in a low humidity atmosphere which is sealed to prevent the entry of blowing dust, rain, or snow. Temperatures should be evenly maintained between 30°F (-1°C) and 110°F (43°C) (wide temperature swings may cause condensation and “sweating” of metal parts). All accessories must be stored indoors in a clean, dry atmosphere.

Remove any accumulations of dirt, water, ice, or snow and wipe dry before moving to indoor storage. To avoid “sweating” of metal parts allow cold parts to reach room temperature. To dry parts and packages use a portable electric heater to get rid of any moisture build up. Leave coverings loose to permit air circulation and to allow for periodic inspection.

The unit should be stored at least 3½ in. (89 mm) off the ﬂoor on wooden blocks covered with moisture proof paper or polyethylene sheathing. Aisles between parts and along all walls should be provided to permit air circulation and space for inspection.

OUTDOOR — Units designed for outdoor applications

may be stored outdoors, if absolutely necessary. Roads or aisles for portable cranes and hauling equipment are needed.

The fan should be placed on a level surface to prevent water from leaking into the unit. The unit should be elevated on an adequate number of wooden blocks so that it is above water and snow levels and has enough blocking to prevent it from settling into soft ground. Locate parts far enough apart to permit air circulation, sunlight, and space for periodic inspection. To minimize water accumulation, place all unit parts on blocking supports so that rain water will run off.

Do not cover parts with plastic ﬁlm or tarps as these cause condensation of moisture from the air passing through heating and cooling cycles.

Inspection and Maintenance during Storage

While in storage, inspect fans once per month. Keep a record of inspection and maintenance performed.

If moisture or dirt accumulations are found on parts, the source should be located and eliminated. At each inspection, rotate the fan wheel by hand ten to ﬁfteen revolutions to distribute lubricant on motor. Every three months, the fan motor should be energized. If paint deterioration begins, consideration should be given to touch-up or repainting. Fans with special coatings may require special techniques for touch-up or repair.

Machined parts coated with rust preventive should be restored to good condition promptly if signs of rust occur. Immediately remove the original rust preventive coating with petroleum solvent and clean with lint-free cloths. Polish any remaining rust from surface with crocus cloth or ﬁne emery paper and oil. Do not destroy the continuity of the surfaces. Wipe thoroughly clean with Tectyl hard to reach internal surfaces or for occasional use, consider using Tectyl® 511M Rust Preventive or WD-40® or the equivalent.

REMOVING FROM STORAGE — As units are removed

from storage to be installed in their ﬁnal location, they should be protected and maintained in a similar fashion, until the equipment goes into operation.

Prior to installing the unit and system components, inspect the unit assembly to make sure it is in working order.

1. Check all fasteners, set screws on the fan, wheel, bearings, drive, motor base, and accessories for tightness.

2. Rotate the fan wheel(s) by hand and assure no parts are rubbing.

506 (Ashland Inc.) or the equivalent. For

Energy Recovery Ventilator2

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Table of Contents

Dimensional Data and Weights

Dimensional Data and Weights ...................3

Service Clearances and Access Panel Locations .....4

Intake and Discharge Locations ..................4

Installation Hang Mounting with Hanging Vibration Isolators ...5

Base Mounting with Base Vibration Isolators ......6

Duct Connections ...........................6

Electrical Connections .........................7

Frost Control ...............................7

Wiring Schematics .......................... 8-9

System Start-Up

Pre-Start-Up Checklist ......................10

Unit Documentation Record ..................10

Unit Start-Up Checklist ......................11

General ..................................12

Energy Wheel .............................12

Blower Wheel Rotation ......................12

Fan RPM .................................12

Motor ....................................12

Routine Maintenance

General ..................................12

Fasteners and Set Screws ...................12

Removal of Dust and Dirt ....................12

Internal Filters .............................12

Energy Wheel Maintenance ................ 12-13

Troubleshooting ..............................14

Optional Vari-Green

EC Motors ................15

Maintenance Log ...................... Backcover

Our Commitment ...................... Backcover

Discharge

Intake

Side "A"

Discharge Side "A"

Front View

Side "B"

Back View

MiniVent A B C

450

750

All dimensions are in inches.

DISCHARGE SIDE "A"

40.2 28.6 19.9 160

45.8 35.3 23.8 240

INTAKE SIDE "A"

Intake Side "B"

Energy Wheel

Weight

(lbs.)

INTAKE SIDE "B"

FRONT VIEW

BACK VIEW

DISCHARGE SIDE "B"

MiniVent D E F G H J K L M N P Q

450

750

All dimensions are in inches.

Intake and Discharge positions are not labeled because they are conﬁgurable by rotation of the unit about the vertical axis. The supply and exhaust can be on either side, but the intake/discharge relationship must be maintained. For example, Outdoor Air Intake = Intake Side “B”/Outdoor Air Discharge = Discharge Side “B”. The preferred conﬁguration is to have the energy wheel motor in the exhaust airstream.

10 8 12 6 4.3 1.4 6 1.5 6 1 4.8 3.4

10 10 18 7 4 2.2 5.1 1.5 5.1 1.1 4 1.5

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Service Clearances and Access Panel Locations

Recommended Service Clearances

The MiniVent requires minimum clearances to perform routine maintenance, such as ﬁlter replacement, energy wheel cassette and fan inspection. Fan and motor assemblies, energy recovery wheel cassette and ﬁlter sections are provided with a service door or panel for proper component access.

MiniVent A B

450 750

All dimensions are in inches.

25 15

31 21

Intake and Discharge Locations

Intake and discharge locations are shown. Both intake locations are capable of being ﬁeld relocated to suit installation needs (see optional locations).

Intake Side “A” (optional)

Access Panel Locations

1. • Outdoor and exhaust fans and motor

• Electrical connection

2. • Energy wheel cassette

• Internal ﬁlters

Discharge

Side “B”

Discharge

Side “A”

Intake

Side “A”

Cassette

Slides Out

Intake

Side “B”

Discharge Side “A”

Intake Side “A”

Discharge Side “B”

Intake Side “B”

Intake Side “B” (optional)

Changing the discharge location

Step 1 - Remove the

metal cover for optional intake by unfastening the four sheet metal screws holding it in place.

Step 2 - Hand bend ﬂanges out to form a duct collar in the newly uncovered intake opening.

Step 3 - Hand bend ﬂanges in on original intake and replace metal cover removed in Step 1.

Intake Cover

Intake Duct

Collar

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Installation

The system design and installation should follow accepted industry practice, such as described in the ASHRAE Handbook and SMACNA.

Minimum service clearance should be provided on the side of the unit for routine service and component removal should it become necessary.

Before beginning installation see page 3 for detail on appropriate service clearances.

Hang Mounting with Hanging Vibration Isolators

• The hanging isolator kit includes four (4) isolators

and required hardware.

• Locate the support rods as shown in the drawing.

• Assemble each isolator as shown.

3/8-inch threaded rod, provided by others

Nut

Hanger bracket, factory-mounted

Small ﬂat washer

Big ﬂat washer

Isolator

Big ﬂat washer Small ﬂat washer Lock washer Nut

Hanging Vibration Isolator Assembly

MiniVent-450

Nut

Hanger bracket, factory-mounted

1/2-inch threaded rod, provided by others

Lock Washer

Flat Washer

Isolator

Flat Washer

Lock Washer

Nut

MiniVent A B C

450 750

All dimensions are in inches.

37.6 26.4 19.9

43.2 33 23.8

Electrical and Fan Access Panel (underside)

Hanging Vibration Isolator Assembly

MiniVent-750

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Base Mounting with Base Vibration Isolation

• The base isolators kit includes four (4) isolators, four (4) brackets and required hardware.

• Rotate the MiniVent 180 degrees, so the electrical and fan component panel is accessible from the top. The corners, where the brackets are fastened, are now closest to the mounting surface.

• Assemble and mount the isolators as shown in the ﬁgures below.

Note: The hanging and base mounting brackets are fastened to the same unit corners.

Electrical

and

Fan Access Panel

Duct Connections

Examples of good and poor fan-to-duct connections are shown below. Airﬂow out of the fan should be directed straight or curve the same direction as the fan wheel rotates. Poor duct installation will result in low airﬂow, loud noise and excessive vibrations.

4x Wheel Diameter

MiniVent

POOR

Less

than 4x Wheel Diameter

Recommended Discharge Duct Size and Length

MiniVent

450

750

All dimensions are in inches.

ERV

Blower Size

8 10 x 8 32

10 10 x 10 40

Duct

Size

GOOD

Straight Duct

Length

Factory-mounted bracket

3/8-inch bolt

Flat washer

Base Vibration Isolator Assembly

Lock washer

Isolator

Assembled and Mounted Isolator Detail

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Electrical Connections

Before connecting power to the unit, read and understand the following instructions and wiring diagrams. Complete wiring diagrams are attached inside the blower door of the unit.

All wiring should be done in accordance with the National Electrical Code ANSI/NFPA 70 latest edition and any local codes that may apply. In Canada, wiring should be done in accordance with the Canadian Electrical Code. The equipment must be properly grounded.

Caution

If any of the original wire must be replaced, the replacement wire must have a temperature rating of at least 105ºC.

DANGER

High voltage electrical input is required for this equipment. This work should be performed by a qualified electrician.

Electrical Connection Location

MiniVent A B

450

750

All dimensions are in inches.

Electrical Connection

21.875 12.5

28.375 15.5

Frost Control

Extremely cold outdoor air temperatures can cause moisture condensation and frosting on the energy recovery wheel. Frost control is an optional feature that will prevent/control wheel frosting.

1. Timed Exhaust frost control

This option is provided with a thermodisc mounted in the outdoor air intake compartment.

Timed exhaust frost control includes a timer in addition to the thermodisc. When timed exhaust frost control is initiated, the timer will turn the supply blower off. Time exhaust using default timer setting will shut down the supply fan for 5 minutes every 30 minutes to allow exhaust to defrost energy wheel. Use the test procedure for troubleshooting.

Frost Control Test Procedure

1. Remove power from unit.

2. Jumper the temperature indicating thermodisc in the unit control center. Thermodisc has a pre-set temperature of 5ºF.

3. Set the frost control timer scale for T1 and T2 to 1m. Set the timer settings for T1 and T2 to 10.

4. Add power to the unit. Blower should cycle on for one minute, then turn off for one minute.

5. Remove power from unit and remove jumpers that were placed. Re-set timer settings.

• T1 timer setting set to 5 and timer scale set to

10m for 5 minutes of wheel off time.

• T2 timer setting set to 5 and timer scale set to

1h for 30 minutes of wheel on time

Wheel and Filter Access

Sequence for wiring MiniVent unit:

1. The unit’s nameplate contains the voltage and total amperage required. The wire supplying power to the unit should be sized accordingly.

2. The main power line should be connected to the appropriate terminal blocks.

Power may be routed to the MiniVent through the

opening on the underside of the unit. The locations for the opening are provided in the ﬁgure to the right.

3. Refer to the wiring diagrams in this manual or in the unit for controlling the MiniVent.

Timer Scale

Timer

Settings

Timer Scale

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Wiring Schematics

Timed Exhaust Frost Control

115/208/230V PRIMARY

24V SECONDARY

VIOLET

RED

ORANGE

BLACK

GROUND

115

208

230

FIELD TO CONNECT

TO TERMINAL DESIGNATED

WITH UNIT LINE VOLTAGE

CONNECT TERMINAL 15 FROM COMPONENT "T1"

WITH LINE VOLTAGE

PURPLE

FIELD MOUNT

IN OUTDOOR

AIR DUCT

COM

Potentiometer Control

(VERIFY MAIN UNIT POWER ON UNIT NAMEPLATE)

MAIN UNIT POWER -115/208/230/60/1

L2 L1

GROUND

YELLOW

REMOTE PANEL

BLACK

ENERGY WHEEL MOTOR

T A OR B

SEE NOTE #3

MAIN UNIT INTERNAL JUNCTION BOX

SEE NOTE#2

BLACK

WHITE

BLACK

WHITE

BLOWER MOTOR A

BLOWER MOTOR B

Legend MA Blower Motor A MB Blower Motor B M1 Energy Wheel Motor M2 Exhaust Blower Motor M3 Supply Blower Motor T1 Frost Control Timer

Typical Settings: t1 (OFF) = 5 min.

t2 (ON) = 30 min.

TH Thermostat; non-adjustable 5° setting.

Required to be mounted in outdoor air duct.

TR Transformer

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Wiring Schematics

0-10 VDC Fan Motor Control

(VERIFY MAIN UNIT POWER ON UNIT NAMEPLATE)

MAIN UNIT POWER -110/50/1-115/60/1

L2 (NEUTRAL)

GROUND

24 VAC

0-10VDC

SEE NOTE#1

SEE NOTE#2

24 VAC

0-10VDC

SEE NOTE#1

SEE NOTE#2

24v

A-

A+

24v

B-

B+

BLACK

WHITE

RED

BLACK

WHITE

BLACK

WHITE

RED

BLACK

WHITE

Solid State Speed Motor Control

(VERIFY MAIN UNIT POWER ON UNIT NAMEPLATE)

MAIN UNIT POWER -115/208/230/60/1

GROUND

ENERGY WHEEL MOTOR

BLOWER MOTOR A

BLOWER MOTOR B

SEE NOTE#2

SPEED CONTROLLER

SEE NOTE#2

BLOWER A

ON OFF

BLOWER B

ON OFF

BLACK

ENERGY WHEEL MOTOR

BLOWER MOTOR A

BLOWER MOTOR B

Legend MA Blower Motor A MB Blower Motor B M1 Energy Wheel Motor M2 Exhaust Blower Motor M3 Supply Blower Motor T1 Frost Control Timer

Typical Settings: t1 (OFF) = 5 min.

t2 (ON) = 30 min.

TH Thermostat; non-adjustable 5° setting.

Required to be mounted in outdoor air duct.

TR Transformer

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System Start-Up

DANGER

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit to OFF at disconnect switch(es). Unit may have multiple power supplies.

CAUTION

Use caution when removing access panels or other unit components, especially while standing on a ladder or other potentially unsteady base. Access panels and unit components can be heavy and serious injury may occur.

CAUTION

Do not operate without the filters and birdscreens installed. They prevent the entry of foreign objects such as leaves, birds, etc.

CAUTION

Do not run unit during construction phase. Damage to internal components may result and void warranty.

WARNING

• Unit was factory tested. All blowers, fans, and compressors are set-up to run correctly when supplied power. If any one fan is running backwards or the compressor is making loud noises, immediately turn off the power. Switch two leads on the incoming power to the disconnect. This will ensure proper operation of the unit. Failure to comply may damage the compressors and void the warranty.

• Do not jumper any safety devices when operating the unit. This may damage components within or cause serious injury or death.

Every installation requires a comprehensive start-up to ensure proper operation of the unit. As part of that process, the following checklist must be completed and information recorded. Starting up the unit in accordance with this checklist will not only ensure proper operation, but will also provide valuable information to personnel performing future maintenance. Should an issue arise which requires factory assistance, this completed document will allow unit experts to provide quicker resolve. Qualiﬁed personnel should perform start-up to ensure safe and proper practices are followed.

Unit Documentation Record

Unit Model No. ___________________________________

Unit Serial No. _____________________________________

Energy Wheel Date Code ___________________________

Start-Up Date _____________________________________

Start-Up Personnel Name __________________________

Start-Up Company _________________________________

Phone Number ____________________________________

Pre-Start-Up Checklist

Disconnect and lock-out all power switches.  Remove any foreign objects that are located in the

energy recovery unit.

 Check all fasteners, set-screws, and locking collars

on the fans, bearings, drives, motor bases and accessories for tightness.

 Rotate the fan wheels and energy recovery wheels

by hand and ensure no parts are rubbing.

 Check the fan belt drives for proper alignment and

tension.

 Filters can load up with dirt during building

construction. Replace any dirty pleated ﬁlters and clean the aluminum mesh ﬁlters in the intake hood.

 Verify that non-motorized dampers open and close

properly.

 Check the tightness of all factory wiring

connections.

 Verify control wire gauge.  Verify diameter seal settings on the energy recovery

wheel.

SPECIAL TOOLS

• Volt meter

• Incline manometer or equivalent

• Tachometer

• Amperage meter

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Start-Up Checklist

Line Voltage. Check at unit disconnect.

L1-L2 Volts

Motor Amp Draw

Supply Motor Amps L1 Amps L2 Amps

Exhaust Motor Amps L1 Amps L2 Amps

Fan RPM

Supply Fan RPM

Exhaust Fan RPM

Correct fan rotation direction?

Supply Fan Yes / No

Exhaust Fan Yes / No

Energy Wheel Motor

L1 Amps L2 Amps

Outdoor Air Temperature Deg F

Return Air Temperature Deg F

Outdoor Air Relative Humidity % RH

Return Air Relative Humidity % RH

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Page 12

System Start-Up - continued

Airflow

General

Check all fasteners and set screws for tightness. This is especially important for bearings and fan wheels Also, if dampers are not motorized, check that they open and close without binding.

Check Voltage

Before starting the unit compare the supplied voltage with the unit’s nameplate voltage and the motor voltage.

Energy Recovery Wheel

First, follow the instructions for pulling the energy recovery cassette halfway out of the unit.

Air Seals — turn the energy recovery wheel by hand to verify free operation. Check that the air seals, located around the outside of the wheel and across the center (both sides of wheel), are secure and in good condition.

Air seals which are too tight will prevent proper rotation of the energy recovery wheel. Recheck the air seals for tightness. Air seal clearance may be checked by placing a sheet of paper, like a feeler gauge, against the wheel face. To adjust the air seals, loosen all eight seal retaining screws. These screws are located on the bearing support that spans the length of the cassette through the wheel center. Tighten the screws so the air seals tug slightly on the sheet of paper as the wheel is turned.

Replace cassette into unit, plug in wheel drive, replace access door and apply power. Observe that the wheel rotates freely. If wheel does not rotate or is binding, remove the cassette; instructions provided on page13.

Check Blower Wheel Rotation

First, hand rotate the blower to ensure that the wheel is not rubbing against the scroll. If the blower is rotating in the wrong direction, the unit will move some air but not perform properly.

To check the rotation, open the blower access panel, which is labeled either supply or exhaust, and run the blower momentarily to determine the rotation.

Air Volume Check and Measurement

Along with the building balance, the unit’s airﬂow (cfm) should be measured and compared with its rated air volume. The MiniVent is direct drive, therefore balancing dampers or speed controls are required for airﬂow balancing. Air volume measurement must be conducted with access doors on the unit.

The most accurate way to measure the air volume is by using the pitot traverse method in the ductwork away from the blower. Other methods can be used but should be proven and accurate.

Forward Curved

To adjust the air volume, change the fan rpm or the system static pressure. See Troubleshooting section in this guide.

With all access panels on the unit, compare measured amps to the motor nameplate full load amps and correct if overamping.

Measure Motor Voltage, Amperage and Fan RPM

All access doors must be installed, run the measurement leads through the provided electrical access hole in the bottom access panel of the MiniVent. Measure and record the input voltage and motor amperage(s).

To measure the fan rpm, the blower door will need to be removed. Minimize measurement time because the motor may overamp with the door removed. Do not

operate units with access doors/panels open as the motors will overload.

With all access panels on the unit, compare measured amps to the motor nameplate full load amps and correct if overamping.

Routine Maintenance

WARNING

Disconnect all electrical power to the MiniVent prior to inspection or servicing. Failure to comply with this safety precaution could result in serious injury or death. Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.

After the MiniVent has been put into operation, an annual inspection and maintenance program should be set-up to preserve reliability and performance.

The MiniVent energy recovery ventilator requires very little maintenance. However, small problems left unchecked, over time, could lead to loss of performance or early motor failure. We recommend that the unit be inspected once or twice a year.

The motor should be checked for lubrication at this time. Lubricate only those motors which have an oil hole provided. A few drops of all-purpose oil (SAE 20) will be sufﬁcient.

Fasteners and Set Screws

Any fan vibration has a tendency to loosen mechanical fasteners. A periodic inspection should include checking all fasteners and set screws for tightness. Particular attention should be paid to set screws attaching the fan wheel to the shaft and the shaft to the bearings. Loose bearing set screws will lead to premature failure of the fan shaft.

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Page 13

Removal of Dust and Dirt

The fan motor and wheel(s) should be checked for dust and dirt accumulation. Dirt buildup clogs cooling openings on the motor housing and causes motor overheating. Dirt buildup can contaminate bearing lubricant and collect on fan wheel blades causing loss of performance or premature failure. Cleaning can be accomplished by brushing off any dust that may have accumulated. Under no circumstances should motors or bearings be sprayed with steam or water. Even ﬁltered units can accumulate build up and should be checked when cleaning ﬁlters.

Maintenance to these components is achieved through the provided access panels.

Internal Filter Maintenance

Opening the access panels labeled “Filter Access” provides access to the oneinch deep, pleated 30%

MiniVent

450 750

efﬁcient ﬁlters. These ﬁlters should be checked regularly and cleaned or replaced as needed.

Internal

Filter Size

14 x 20 2

16 x 20 2

Quantity

Energy Wheel

Annual inspection of the energy recovery wheel is recommended. MiniVent units ventilating smoking lounges and other non-clean air spaces should have energy recovery wheel inspections more often based upon need.

Accessing the Energy Recovery Wheel

Disconnect power to the MiniVent. Remove access panel labeled “Energy Wheel Cassette Access”. Unplug the wheel drive motor. Pull the cassette halfway out.

Removing the Energy Recovery Wheel

First, remove the drive belt and the collars on both bearings. On the pulley side of the cassette remove the four (4) fasteners that hold the bearing support channel in place. Once the bearing support is removed the wheel can be pulled from the cassette. To replace the wheel reverse this procedure.

Recommended Cleaning Procedure

First, remove the energy recovery wheel by following the instructions on this page.

Wash the segments or small wheels with a non-acid based (evaporator) coil cleaner or alkaline detergent solution, such as 409™ or Fantastik™. Non-acid based coil cleaner such as KMP Acti-Clean AK-1 concentrate in a 5% solution has been demonstrated to provide excellent results. Do not use acid based cleaners, aromatic solvents, temperatures in excess of 140ºF or steam; damage to the wheel may result. Soak in the cleaning solution until dirt, grease, and/or tar deposits are loosened. Internal heat exchange surfaces may be examined by separating the polymer strips by hand.

Note: Some staining of the desiccant may remain and is not harmful to performance.

After soaking, rinse the dirty solution from the wheel until the water runs clear. Allow excess water to drain from the media prior to reinstalling the wheel in the cassette. A small amount of water remaining in the wheel will be dried out by the airﬂow.

Frequency of Cleaning

A regular cleaning cycle must be established for the energy recovery wheel in order to maintain optimum sensible and latent energy transfer. In reasonably clean environments such as schools, ofﬁces or retail stores, the energy recovery wheel should be inspected annually and cleaned as needed.

For applications experiencing unusually high levels of tobacco smoke, such as lounges, nightclubs, bars and restaurants, washing of the energy recovery wheel every three months may be necessary to maintain latent energy (water vapor) transfer efﬁciency.

Failure to follow a regular cleaning cycle for the energy recovery wheel can result in signiﬁcant energy transfer performance losses.

Energy Recovery Wheel Belt Drive

Drive belt(s) should be inspected annually. Normal operation eventually causes stretching or wear on the belt(s). Once this occurs the belt(s) should be replaced.

Replacement or spare energy wheel drive belt kits are available and ship with their own instructions. The serial number and date code of the energy wheel cassette are required to obtain the proper replacement belt kit from the factory. The energy wheel serial number and date code are located on a label above the drive pulley on the energy wheel cassette.

Energy Recovery Ventilator 13

Page 14

Troubleshooting

Symptom Possible Cause Corrective Action

Unit is NOT operating

Excessive noise

Low airﬂow (cfm)

Electrical

Motor

Fan wheel rubbing on inlet

Bearings

Check fuses/circuit breakers, replace if needed. Check for On/Off switches. Check for correct supply voltage.

Check motor horsepower is correct and not tripping overloads.

Adjust wheel and/or inlet cone. Tighten wheel hub or bearing collars on shaft.

Replace defective bearing(s). Lubricate bearings. Tighten collars and fasteners.

Wheel out of balance Clean, replace or rebalance.

Fan speed too low Check for correct rpms with catalog data.

Fan wheels are operating backwards

Refer to Blower Wheel Rotation information on page 12.

Dirty ﬁlters or energy wheel Replace ﬁlters and/or follow the cleaning procedures.

High static pressure

Incorrect fan-to-duct connections. Make sure dampers open appropriately. Increase fan speed

Fan speed too high Check for correct fan rpm.

High airﬂow (cfm)

Low static pressure

Make sure grilles, ﬁlters and access doors are installed. Decrease fan speed.

Air seals too tight Refer to Energy Recovery Wheel, Air Seals on page 12.

Energy wheel does NOT turn

Energy wheel runs intermittently

No power to wheel motor

Wheel drive belt

Wheel motor overloads are tripping due to rubbing between wheel and air seals.

Make sure wheel drive is plugged in/connected. Verify power is available.

Check for loose or broken belts. Replace belts; consult factory.

Recheck air seals, make sure they are not too tight. See Energy Recovery Wheel, Air Seals on page 12.

Always provide the unit model and serial number when requesting parts or service information. Always check motor amps and compare to nameplate rating.

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Optional Vari-Green® Electronically Commutated (EC) Motor

Features

Speed control These motors can be controlled by either the dial on the motor or a 0-10 VDC signal for remote control.

Soft start – All motors feature soft-start technology which eliminates inrush current at start-up. The motors will reliably start at any speed setting. There will be a four second delay between the application of power and the motor starting.

Overload protection – If the motor becomes overloaded, it will automatically reduce its speed until it is no longer overloaded. This prevents the motor from operating in the "service factor" should the motor be misapplied.

Locked rotor protection – If the motor ever encounters a locked-rotor scenario, the motor will automatically shut itself down. It will try to restart up to 3 times, and if after the 3rd time the motor will still not rotate, the motor will not attempt to start again until power is cycled.

Thermal protection – The motors have electronic thermal protection. If the motor temperature exceeds its limits, it will slow itself down until the temperatures have dropped.

Operation and Wiring

These motors can be controlled by either the dial on the motor or a 0-10 VDC signal for remote control. The motor will be supplied from the factory with the correct accessory depending on what control option was ordered.

Dial on Motor - Turn the dial with your ﬁngers to adjust. To increase the speed, rotate the dial clockwise. To decrease the speed, rotate the dial counter-clockwise. Turning the dial full CCW will turn the motor off. A 16-pin connector with two jumper wires must be installed for the dial to function.

0-10 VDC Signal - From 0-1.9V, the motor will be off, and will operate within the 2-10V range. This motor does not require 24V power for operation. For 0-10V operation, a 16-pin connector with two wires connected to pins 8 and 16 is required.

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