Cook Economizer User manual

1ECONOMIZER IO&M B51132-003

ECONOMIZER FAN

Economizer Fans

INSTALLATION, OPERATION AND MAINTENANCE MANUAL

Receiving and Inspection

Carefully inspect the fan and accessories for any damage

and shortage immediately upon receipt of the fan.

The control panel, if ordered, is shipped inside of the roof

base. It is not counted as a separate part.

• Turn the propeller by hand to ensure it turns freely and does

not bind

• Check the dampers for free operation of all moving parts

• Record on the Delivery Receipt any visible sign of damage

Handling

Lifting bars are located on the top of the cabinet assembly.

They should be used to lift the unit and also to lower the unit

on to the curb. The hood assembly should be lifted by the

shipping crate or the base.

Economizer

Rotating Parts & Electrical Shock Hazard:

Fans should be installed and serviced by qualied personnel

only.

Disconnect electric power before working on unit (prior to re-

moval of guards or entry into access doors).

Follow proper lockout/tagout procedures to ensure the unit

cannot be energized while being installed or serviced.

A disconnect switch should be placed near the fan in order

that the power can be swiftly cut o󰀨, in case of an emergency

and in order that maintenance personnel are provided com-

plete control of the power source.

Grounding is required. All eld-installed wiring must be com-

pleted by qualied personnel. All eld installed wiring must

comply with National Electric Code (NFPA 70) and all appli-

cable local codes.

Fans and blowers create pressure at the discharge and vac-

uum at the inlet. This may cause objects to get pulled into the

unit and objects to be propelled rapidly from the discharge.

The discharge should always be directed in a safe direction

and inlets should not be left unguarded. Any object pulled into

the inlet will become a projectile capable of causing serious

injury or death.

When air is allowed to move through a non-powered fan, the

impeller can rotate, which is referred to as windmilling. Wind-

milling will cause hazardous conditions due to unexpected ro-

tation of components. Impellers should be blocked in position

or air passages blocked to prevent draft when working on fans.

Friction and power loss inside rotating components will cause

them to be a potential burn hazard. All components should be

approached with caution and/or allowed to cool before con-

tacting them for maintenance.

Under certain lighting conditions, rotating components may

appear stationary. Components should be veried to be sta-

tionary in a safe manner, before they come into contact with

personnel, tools or clothing.

Failure to follow these instructions could result in death or se-

rious injury.

The attachment of roof mounted fans to the roof curb as well

as the attachment of roof curbs to the building structure must

exceed the structural requirements based on the environmen-

tal loading derived from the applicable building code for the

site. The local code o󰀩cial may require variations from the

recognized code based on local data. The licensed engineer

of record will be responsible for prescribing the correct attach-

ment based on construction materials, code requirements and

environmental e󰀨ects specic to the installation.

This publication contains the installation, operation and

maintenance instructions for standard units of the Economizer

Fan - Economizer Fans with Mix, Recirculate, Supply and

Exhaust Modes.

Carefully read this publication and any

supplemental documents prior to any

installation or maintenance procedure.

Loren Cook catalog, Economizer Fan, provides additional

information describing the equipment, fan performance, avail-

able accessories and specication data.

For additional safety information, refer to AMCA Publication

410-96, Safety Practices for Users and Installers of Industrial

and Commercial Fans.

All of the publications listed above can be obtained from:

• lorencook.com

• [email protected]

• 417-869-6474 ext. 166

For information and instructions on special equipment, con-

tact Loren Cook Company at 417-869-6474.

2ECONOMIZER IO&M B51132-003

Storage

If the fan is stored for any length of time prior to installation,

completely ll the bearings with grease or moisture-inhibiting

oil. Store the fan in its original crate and protect it from dust, de-

bris and weather.

• Cover the inlet, and outlet opening to prevent the

accumulation of dirt and moisture in the housing

• Periodically rotate the prop to keep a coating of grease on

all internal bearing parts

• Periodically inspect the unit to prevent damaging conditions

Installation

1. Ensure there is a minimum 3 inch clearance between the

interior of the building and the unit’s side dampers.

2. Attach lifting straps to the lifting bars at the top of the cabi-

net assembly. Lift the assembly and then lower it through

the roof curb until the assembly’s outer ﬂange rests on the

top of the roof curb. The curb should be level to allow the

cabinet to hang free.

3. Assemble the hood to hood base. Refer to Hood

Assembly instructions on page 2.

4. Lower the hood assembly on to the roof curb and secure

it and the cabinet assembly to the roof curb with anchor

bolts or lag screws as required.

5. Pre-wire the service switch on the roof base, if equipped.

6. Install the hood assembly lters, if required. Refer to Fil-

tered Units Only section on page 2.

7. Install the outlet di󰀨user on the lower end of the cabinet

assembly, if equipped. Place the di󰀨user over the bottom

of the cabinet assembly. Secure the di󰀨user to the cabinet

with number 12 sheet metal screws installed through the

ﬂange, spaced at 6 inch intervals around the perimeter.

8. If no outlet di󰀨user is supplied, install the outlet guard over

the bottom of the cabinet assembly. Secure the outlet

guard to the cabinet with number 12 sheet metal screws

installed through the ﬂange, spaced at 6 inch intervals

around the perimeter.

9. Install the control panel, if equipped, in a convenient loca-

tion. Refer to the wiring installation section, page 3 for wir-

ing instructions.

Figure 1

Hood Assembly

Hoods on some non-ltered units (size 54 or larger) and

some ltered units (size 48 or larger) require eld assembly.

Assembly is accomplished using 1/2 inch and 9/16 inch socket

wrenches.

Line-up punches and hand clamps will speed up the as-

sembly. Figure 1 shows the components used to assemble

the hood.

1. Place the hood halves (A) onto the hood supports (D).

Line up the hood ﬂanges and bolt the ﬂanges of the hood

ends together. The topcaps (B) must be inter-locked for

the ﬂanges to meet correctly.

2. Go under the hood and bolt the hood (angle ﬂange) to the

hood supports (D) at the four overlapping locations.

3. Install the two perimeter angles (C) inside each end of the

hood.

4. If there is a gap between the top cap edges, loosen the

top cap bolts. Install a bolt in each end of the top cap

ﬂange to pull the two top caps together. Tighten the top

cap bolts.

Filtered Units Only

5. Place the two long lter retainers (E) and the two short

lter retainers (F) on top of the base and bolt the pieces

together.

6. Bolt the long lter retainers (E) to the perimeter angles (C)

that are at the ends of each hood.

7. Install lters according to the Filter Schedule. Insert the

edge of the lter into the lter retainer (E), swing lter into

position and ﬂip the lter holding the clip into position. Re-

fer to the Filter Installation detail illustration.

Economizer Fan Filter Installation Detail

Control Panel Installation (if equipped)

The optional control panel is used to control the functions of

the Economizer fan. Locate the panel in a convenient area to

install wiring and operate the fan. Permanently attach the con-

trol panel to a suitable structure by bolting through the back

of the panel.

Temperature Sensor Installation (if equipped)

A temperature sensor is supplied as a part of the optional

Modulating Temperature Control. To prevent damage to the

fan during transit, the temperature sensor is shipped loose (in-

side the control panel). Follow the instructions below to mount

the temperature sensor.

1. Drill a 11/32 inch diameter hole in one corner of the venturi

panel, located in the bottom of the fan cabinet.

2. From the inside of the cabinet, screw the compression t-

ting (shipped with the sensor) into the hole.

3. Install the sensor through the hole (push through 1/2”).

4. Tighten the tting to hold the sensor in place.

(Filter Schedule on next page)

3ECONOMIZER IO&M B51132-003

Economizer Fan

Filter Schedule

Type 2Type 2Type 2Type 2Type 2

Type 1

Follow the wiring diagram in the disconnect switch and the

wiring diagram provided with the motor.

Wiring Installation

All wiring should be in accordance with local ordinances

and the National Electrical Code, NFPA 70. Ensure the power

supply (voltage, frequency, and current carrying capacity of

wires) is in accordance with the motor name-plate. Refer to

the Control Panel Wiring Diagram, below.

Fan accessories will determine the wiring installation proce-

dure you should follow. If your unit has a disconnect switch,

follow the wiring diagram provided on the disconnect switch

and the wiring diagram on the motor.

Correctly label the circuit on the main power box and always

identify a closed switch to promote safety (i.e. red tape over a

closed switch).

Lock o all power sources before unit is wired to

power source. Restrain the wire as necessary to

pre-vent it from being pulled into any rotating parts.

Fan Wiring

Drill a wire access hole through the cabinet side below one

of the access doors. Attach the appropriate size wire and con-

duit to the motor and run the wires to the control panel. Attach

wires (18 gauge minimum) to the damper actuator (Red, Black,

#3) and the temperature sensor (Red, 2-White), if equipped,

and run the wires to the control panel. Attach the fan wires to

the control panel terminals according the diagram below.

Wire the roof disconnect switch, if equipped, and the fan

motor. The fan should rotate clockwise, when looking up from

the bottom, in supply mode. The rotation may be changed by

switching two of the three motor leads. When rotation is cor-

rect, reinstall the access panels.

Control Panel Wiring Diagram

4ECONOMIZER IO&M B51132-003

Final Installation Steps

1. Check and tighten fasteners and setscrews, particularly

unit mounting fasteners. Tighten according to the recom-

mended torque shown in the below table, Recommended

Torque for Setscrews/Bolts.

2. Check for correct voltage with voltmeter.

3. Ensure all accessories are installed.

Recommended Torque for Setscrews/Bolts (IN-LB)

Setscrews Hold Down Bolts

Size

Key Hex

Across

Flats

Recommended

Torque Size Recommended

Torque

Min. Max.

#8 5/64” 15 21 3/8”-16 324

#10 3/32” 27 33 1/2”-13 780

1/4 1/8“ 70 80 5/8 ”-11 1440

5/16 5/32” 140 160 3/4”-10 2400

3/8 3/16” 250 290 7/8”-9 1920

7/16 7/32” 355 405 1”-8 2700

1/2 1/4“ 560 640 1-1/8”-7 4200

5/8 5/16” 1120 1280 1-1/4”-7 6000

3/4 3/8” 1680 1920 - -

7/8 1/2” 4200 4800 - -

19/16” 5600 6400 - -

Operation

Pre-Start Checks

1. Lock out all the primary and secondary power sources.

2. Check and tighten fasteners and setscrews, particularly

those used for mounting the unit.

3. Check motor wiring.

4. Rotate the prop to ensure it does not rub against the

venturi.

5. Ensure fan and duct work are clean and free of debris.

6. Close and secure all access doors.

7. Restore power to unit.

There are four basic designs for the operation control panel

on this unit. They are dened by whether or not the fan unit is

reversible, and whether or not the mix mode is supplied with a

temperature control and modulating dampers.

Modes

MRS-D: mix, recirculate, supply.

MRS-D with Modulating Temperature Controller: mix

dependent upon fan outlet temperature, recirculate, supply.

MRSE-D: mix, recirculate, supply, exhaust.

MRSE-D with Modulating Temperature Controller: mix

dependent upon fan outlet temperature, recirculate, supply,

exhaust.

The function pad on the front of the control panel contains

two operators - a Start/Mode button and a Stop button.

When the Start/Mode button is depressed, the top mode

light will start to ﬂash. This light will ﬂash for three seconds to

indicate that a mode is ready to begin. If the mode button is

pressed again within the three second delay, the next mode

light will begin to ﬂash. If the mode light is allowed to ﬂash for

the full three seconds, the light will then stay on and the fan

will start.

If the panel contains a temperature controller, this module

will be powered only during mix mode. The display on the

temperature controller indicates the outlet temperature of the

fan and the set value which it is trying to produce by mixing

outside air and inside air. The set value temperature must be

between the indoor and outdoor temperatures in order for

the fan to match the set value. Refer to the Control Panel for

programming instructions to set the value temperature.

If the operating mode is changed, such that the direction of

the propeller rotation must change, there will be a 30 second

spin down delay before the start of the new mode.

Start-Up

Turn fan on in supply mode. Inspect for the following:

• Direction of rotation.

• Excessive vibration.

• Unusual noise.

• Improper motor amperage or voltage.

If a problem is discovered, immediately shut the fan o.

Lock out all electrical power and check for the cause of

trouble. Refer to Troubleshooting, page 5.

Inspection

Inspection of the fan should be conducted at the rst 30

minute, 8 hour and 24 hour intervals of satisfactory opera-

tion. During the inspections, stop the fan and inspect as in-

structed.

30 Minute Interval

Inspect bolts, setscrews, and motor mounting bolts. Adjust

and tighten as necessary.

8 Hour Interval

Inspect bolts, setscrews, and motor mounting bolts. Adjust

and tighten as necessary.

24 Hour Interval

Inspect bolts, setscrews, and motor mounting bolts. Adjust

and tighten as necessary.

Maintenance

Establish a schedule for inspecting all rotating parts. The

frequency of inspection depends on the operating conditions

and location of the fan.

Inspect fans exhausting corrosive air within the rst month

of operation.

Yearly inspections are recommended for fans exhausting

non-contaminated air.

It is recommended that inspection of the unit be con-ducted

twice annually.

• Inspect bolts and setscrews for tightness. Tighten as

necessary. Refer to Recommended Torque chart

• Inspect for cleanliness. Clean exterior surfaces only.

Removing dust and grease build-up on motor housing

assures proper motor cooling

Clean the propeller and air inlets if material build-up is ex-

cessive. Excessive build-up can cause imbalance and failure

of the propeller. When cleaning the propeller, always clean the

entire propeller. Partial cleaning will cause imbalance and will

lead to unit failure.

Filters

Filters should be checked within the rst two weeks of op-

eration. If there is no excessive build-up, monthly servicing

should be adequate.

To clean reusable aluminum lters, back ﬂush with soap and

water. When clean, shake o󰀨 excess water and allow the lter

to air-dry before reinstalling it.

5ECONOMIZER IO&M B51132-003

Please note the following tables concerning lter sizes.

Economizer Fan Filter Sizes

Unit

Size

Type 1 Type 2

Length x Width No.

Req. Length x Width No.

Req.

24 18-1/4” x 30-1/8” 218-1/4” x 33-1/4” 4

30 20-7/16” x 18-1/16” 420-7/16” x 25-13/16” 6

36 22-1/4 x 21-1/16” 422-1/4” x 29-5/32” 6

42 24-1/16” x 29-1/2” 4 26-7/8” x 19-1/4” 6

48 27” x 27” 4 27” x 27” 8

54 29-1/8” x 20” 6 29-1/8” x 23-5/8” 10

60 37-7/8” x 21-7/8” 6 26” x 28-9/16” 10

Motor Bearings

Motors are provided with prelubricated bearings. Any lubri-

cation instructions shown on the motor nameplate supersede

instructions below.

Motor bearings without provisions for relubrication will op-

erate up to 10 years under normal conditions with no mainte-

nance. In severe applications, high temperatures or excessive

contaminates, it is advisable to have the maintenance depart-

ment disassemble and lubricate the bearings after 3 years of

operation to pre-vent interruption of service.

For motors with provisions for relubrication, follow intervals

of the table below.

Relubrication Intervals

Service

Conditions

NEMA Frame Size

Up to and

including 184T 213T–365T 404T and larger

1800 RPM

and less

Over

1800

RPM

1800

RPM

and less

Over

1800

RPM

1800

RPM

and less

Over 1800

RPM

Standard 1-1/2 yrs. 3

months 1 yr. 3 months 6 months 1-1/2

months

Severe 6 months 1-1/2

months

1-1/2

months 3 months 2 weeks

Motors are provided with a polyurea mineral oil NGLI #2

grease. All additions to the motor bearings are to be with

a compatible grease such as Exxon Mobil Polyrex EM and

Chevron SRI.

Motor Services

Should the motor prove defective within a one-year period,

contact your local Loren Cook Company representative or

your nearest authorized electric motor service representative.

Troubleshooting

Problem and Potential Cause

Low Capacity or Pressure:

• Incorrect direction of rotation. Make sure the fan rotates

in same direction as the arrows on the motor or belt drive

assembly

• Poor fan inlet conditions. There should be a straight clear

duct at the inlet

• Improper propeller alignment

Excessive Vibration and Noise:

• Damaged or unbalanced wheel

• Belts too loose; worn or oily belts

• Speed too high

• Incorrect direction of rotation. Make sure the fan rotates

in same direction as the arrows on the motor or belt drive

assembly

• Bearings need lubrication or replacement

• Fan surge

Overheated Motor:

• Motor improperly wired

• Incorrect direction of rotation. Make sure the fan rotates

in same direction as the arrows on the motor or belt drive

assembly

• Cooling air diverted or blocked

• Improper inlet clearance

• Incorrect fan RPMs

• Incorrect voltage

Overheated Bearings:

• Improper bearing lubrication

• Excessive belt tension

6ECONOMIZER IO&M B51132-003

Economizer Hood Replacement Parts List

Part

No. Description

Number Required

Non-Filtered Filtered

24 30 36 42 48 54 60 24 30 36 42 48 54 60

1Perimeter Angle - - - -4444444448

2Angle Support - - - - 4 4 4 - - - 4 4 4 4

3Top Cap 11222221222222

4Hood 11112221112222

5Filter Rack - - - - - - - 2 2 2 2 2 2 4

6Filter Crossmember - - - - - - - 2 2 2 2 2 2 2

7 Corner Post 4 4 4 4 4 4 4 - - - 4 4 4 4

8Base Assembly 11111111111111

9 Hood Support - - - - - 2 2 - - - - 2 2 2

10 Hood Support Angle - - - - 2 2 2 - - - 2 2 2 4

11 CenterPost --------------

Not

Shown

Filters (MRSF only) -- -- -- -- -- -- -- 610 10 10 12 16 16

Filter Retainer Clips

(MRSF only) -- -- -- -- -- -- -- 12 20 20 20 24 32 32

7ECONOMIZER IO&M B51132-003

Part No. Description

1Upper Cabinet Assembly

2Top Damper

3 Top Damper Support (4)

4 Corner Posts (4)

5 Access Door (2)

6 Access Door Mount (4)

7Motor Plate

8Lower Cabinet/ Power Assembly

9Di󰀨user Panel (optional)

10 Motor

11 Side Damper Mount (4)

12 Side Damper (2)

Not Shown Extruded Propeller (not shown)

Economizer Cabinet Parts List

8ECONOMIZER IO&M B51132-003

Corporate O󰀩ces: 2015 E. Dale St. Springeld, MO 65803

Phone 417-869-6474 | Fax 417-862-3820 | lorencook.com

Limited Warranty

Loren Cook Company warrants that your Loren Cook fan was manufactured free of defects in materials and workmanship, to the extent stated herein. For a

period of one (1) year after date of shipment, we will replace any parts found to be defective without charge, except for shipping costs which will be paid by you.

This warranty is granted only to the original purchaser placing the fan in service. This warranty is void if the fan or any part thereof has been altered or modied

from its original design or has been abused, misused, damaged or is in worn condition or if the fan has been used other than for the uses described in the com-

pany manual. This warranty does not cover defects resulting from normal wear and tear. To make a warranty claim, notify Loren Cook Company, General O󰀩ces,

2015 East Dale Street, Springeld, Missouri 65803-4637, explaining in writing, in detail, your complaint and referring to the specic model and serial numbers of

your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notied, within thirty (30) days of our receipt of your complaint, in writing, as

to the manner in which your claim will be handled. If you are entitled to warranty relief, a warranty adjustment will be completed within sixty (60) business days of

the receipt of your written complaint by Loren Cook Company. This warranty gives only the original purchaser placing the fan in service specically the right. You