Greenheck Fan Make Up Air Unit 470658 Msx Users Manual

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Installation, Operation and Maintenance Manual

Please read and save these instructions. 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! Retain instructions for future reference.

1

®

Part #470658

MSX

Make-Up Air Unit

®

®Model MSX Make-Up Air

Only qualified personnel should install this unit.

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.

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 Electric Code (CEC) in

Canada.

General Safety Information IMPORTANT

All factory provided lifting lugs must be used when

lifting any unit. Failure to comply with this safety

precaution could result in property damage, serious

injury or death.

WARNING

Disconnect all electrical power to the fan and secure

to the “OFF” position prior to inspection or servicing.

Failure to comply with this safety precaution could

result in serious injury or death.

WARNING

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.

2. The rotation of the wheel is critical. It must be free

to rotate without striking or rubbing any stationary

objects.

3. Motor must be securely and adequately grounded.

4. Do not spin fan wheel faster than maximum

cataloged fan rpm. Adjustments to fan speed

significantly effects 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 blower access doors while the fan is

running.

DANGER

Always disconnect power before working on or

near a unit. Lock and tag the disconnect switch or

breaker to prevent accidental power up.

CAUTION

When servicing the unit, motor may be hot enough

to cause pain or injury. Allow motor to cool before

servicing.

2 ®

Model MSX Make-Up Air

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® 506 (Ashland Inc.) or

the equivalent. For 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.

Receiving

Upon receiving the product check to make sure all

items are accounted for by referencing the bill of

lading to ensure all items were received. Inspect

each crate for shipping damage before accepting

delivery. Notify the carrier if any damage is noticed.

The carrier will make notification on the delivery

receipt acknowledging any damage to the product.

All damage should be noted on all the copies of the

bill of lading which is countersigned by the delivering

carrier. A Carrier Inspection Report should be filled

out by the carrier upon arrival and reported to the

Traffic Department. If damaged upon arrival, file claim

with carrier. 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

110F (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.

3

®Model MSX Make-Up Air

Table of Contents

Installation

Clearance to Combustibles/Service Clearances . 3

Indoor Unit ............................... 3

Unit Arrangement DB / HZ / UB .............. 4

Roof Mounted Unit — Arrangement DBC .....5-6

Optional Evaporative Cooling Module ......... 7

Electrical Wiring .......................... 8

Optional Electrical Heater ................... 9

Optional Evaporative Cooling Piping .......10-11

Optional Water Wizard™ .................. 12

Optional Direct Expansion (DX) Coil Piping ..13-14

Optional Chilled Water Coil Piping ........... 14

Optional Building Pressure Control .......... 15

Start-Up

Blower ...............................16-17

Optional Electric Heater ................... 18

Optional Evaporative Cooling Recirculating ... 19

Optional Water Wizard™ ................20-21

Operation

Optional VAV Units ....................... 22

Optional Recirculating Units ................ 23

Electrical ............................... 24

Optional Water Wizard™ .................. 25

Troubleshooting

Blower ................................. 26

Motor Overamps ......................... 27

Insufficient / Too Much Airflow .............. 28

Excessive Noise or Vibration ............... 29

Optional Electric Heater ................... 30

Optional Evaporative Cooling ............... 31

Optional Water Wizard™ .................. 32

Maintenance

Routine ..............................33-35

Fall .................................... 36

Reference

Control Center Layout / Dirty Filter Switch .... 37

Start-Up Check List ...................... 38

Maintenance Log ........................ 39

Warranty .........................Backcover

Clearance to Combustibles /

Service Clearances

Floor Top Sides Ends

Insulated/

Units

0 inches

(0 mm)

0 inches

(0 mm)

0 inches

(0 mm)

0 inches

(0 mm)

Non Insulated

Units

0 inches

(0 mm)

6 inches

(152.4 mm)

6 inches

(152.4 mm)

6 inches

(152.4 mm)

Clearance to combustibles is defined as the minimum distance

required between the heater and adjacent combustible surfaces to

ensure the adjacent surface’s temperature does not exceed 90 degrees

above the ambient temperature.

Recommended Minimum Service Clearances

Housing 32 and less

42 inches (1066.8 mm)

on the controls side of the unit

Housing 35 and higher

48 inches (1219.2 mm)

on the controls side of the unit

Clearances for component removal (such as evaporative cooler media)

may be greater than the service clearances listed.

Installation of Indoor Unit

3. Seal Wall Opening

Apply sealant around

the perimeter of the

weatherhood to prevent

water penetration and

drafts into the building.

1. Install Hangers

Install threaded hangers from ceiling supports. When

locating hangers, allow enough room to open access

panel(s). Two nuts must be used on the end of each

threaded hanger. Ceiling supports are supplied by

others.

2. Install Unit

Using sheet metal screws, attach the weatherhood/

thru-wall/filter section to the blower/burner section.

The flange on the weatherhood/thru-wall/filter section

should overlap the flange on the blower/burner section.

Raise the assembled unit into place.

Using two nuts per hanger, fasten the unit supports to

the hangers under the unit. Appropriate unit supports,

such as the optional Greenheck hanging bracket kit or

c-channel and angle iron (supplied by others) should be

used.

Using self

tapping

screws,

attach

ductwork to

unit.

In order to

prevent the

unit from

swinging

and to

provide

a safe

environment for service and maintenance, additional

measures must be taken to secure the unit in all

directions.

Unit Supports

Ceiling Supports

Hangers

Ductwork

NOTE

Two nuts must be used on each end of each

threaded hanging rod for proper support.

NOTE

Good duct practices should be followed for

all ductwork. Ductwork should be installed in

accordance with SMACNA and AMCA guidelines,

NFPA 96 and any local codes. Reference the CAPS

submittal for duct sizes.

Indoor Mounting

Sealant

Seal Wall Opening

4 ®

Model MSX Make-Up Air

5. Assemble and Attach Weatherhood

The weatherhood can now be assembled and

attached to the unit. Detailed assembly instructions

can be found with the weatherhood. If the optional

evaporative cooling module was selected, this step

does not apply, refer to the Installation of the Optional

Evaporative Cooling Module section, page 7.

6. Seal Weatherhood Seam

Using an appropriate sealant, seal the seam between

the weatherhood and the unit.

NOTE

The use of all lifting lugs and a set of spreader bars

is mandatory when lifting the unit.

NOTE

Some units come with the weatherhood attached

and Step 5 may not apply.

Installation of

Arrangement DB / HZ / UB

1. Install Curb and/or Equipment

Support(s)

Position curb/equipment support(s) on the roof

(reference the CAPS submittal for placement of curb/

equipment support(s) in relation to the unit). Verify

that unit supports are level, shim if necessary. Attach

curb to roof and flash into place. Attach the equipment

support(s) to the roof, remove metal cover, flash to

wooden nailer and reinstall cover.

2. Install Ductwork

Good duct practices should be followed for all ductwork.

All ductwork should be installed in accordance with

SMACNA and AMCA guidelines, NFPA 96 and all local

codes. Reference the CAPS submittal for ductwork sizes.

3. Apply Sealant

Apply an appropriate sealant around the perimeter of

the curb

and duct

adapter(s)

to isolate

fan

vibration

and prevent

water

penetration.

4. Install Unit

Use a crane and a

set of spreader bars

hooked to the factory

lifting lugs to lift and

center the unit on

the curb/equipment

support(s).

Use self-tapping

sheet metal screws

to fasten the unit to

the curb/equipment

support(s).

Supply Air Ductwork

(Arrangement DB only)

Sealant

NOTE

The use of a duct adapter is recommended on a

downblast (DB) arrangement to align the ductwork

with the supply unit. The duct adapter is only a

guide and is not to be used as a support for the

ductwork.

Setting Unit

Ductwork

Metal Cover

Equipment

Support

Roof Curb

Roof Curb and Equipment Support

Complete Rooftop Installation

5

®Model MSX Make-Up Air

Installation of Roof Mounted Unit

Arrangement DBC

1. Install Curb/Equipment Support(s)

Position curb/equipment support(s) on the roof

(reference the CAPS submittal for placement of curb/

equipment support(s) in relation to the unit). Verify

that all unit supports are level, shim if necessary.

Attach curb to roof and flash into place. Attach the

equipment support(s) to the roof, remove metal cover,

flash to wooden nailer and reinstall cover.

2. Install Combination Extension

Install combination extension over curb. Lag into

place using wood screws. Locate the extension so the

tall vented side is over the

exhaust opening.

6. Install Exhaust Options

Install optional Greenheck hinge kit with restraining

cables and grease trap with drain connection.

5. Install Exhaust Fan

Fasten exhaust fan to curb extension with self-

tapping sheet metal screws. Installing the exhaust fan

prior to the supply unit will allow for easier installation

of options.

4. Apply Sealant

Apply an appropriate sealant around the perimeter of

the curb and duct adapter(s) to isolate fan vibration

and prevent water penetration.

3. Install Ductwork

Good duct practices should be followed for all

ductwork. All ductwork should be installed in

accordance with SMACNA and AMCA guidelines,

NFPA 96 and any local codes. Reference the CAPS

submittal for ductwork size and location.

Supply

Ductwork

by Others

Exhaust

Ductwork

by Others

NOTE

The use of a duct adapter is recommended on a

downblast (DBC) arrangement to align the ductwork

with the supply unit. The duct adapter is only a guide

and is not to be used as a support for the ductwork.

NOTE

NFPA 96 requires the exhaust fan to be hinged.

Metal Cover

Equipment

Support

Roof Curb

Roof Curb and Equipment Support

Exhaust

Supply

1 inch

Inside Flange

Combination Extension

Ductwork

Supply Duct with

Duct Adapter Installed

Exhaust Duct

Installed

Sealant

Sealing Ductwork

Model CUBE

Exhaust Fan

Installing Exhaust Fan

Supply

Ductwork

by Others

Exhaust

Ductwork

by Others

6 ®

Model MSX Make-Up Air

7. Install Supply Unit

Use a crane and a set of spreader bars hooked to the

factory lifting lugs to lift and center the unit on the

extension/equipment support(s).

Use self-tapping sheet metal screws to fasten the unit

to the extension/equipment support(s).

8. Assemble and Attach Weatherhood

The weatherhood can now be assembled and/or

attached to the unit. Detailed assembly instructions

can be found with the weatherhood. If the optional

evaporative cooling module was selected, this step

does not apply, refer to the next section, Installation of

the Optional Evaporative Cooling Module.

9. Seal Weatherhood Seam

Using an appropriate sealant, seal the seam between

the weatherhood and the unit.

NOTE

The use of all lifting lugs and a set of spreader bars

is mandatory when lifting unit.

NOTE

Some units come with the weatherhood attached

and Step 8 may not apply.

Installing Supply Unit

Complete Combination Installation

7

®Model MSX Make-Up Air

Installation of Evaporative Cooling

Module (optional)

NOTE

Small evaporative coolers ship attached to the base

unit and require no additional mounting.

NOTE

The use of all lifting lugs and a set of spreader bars is

mandatory when lifting the evaporative cooling module.

NOTE

When mounting the evaporative cooler, it is

important that it is level to ensure proper operation

and water drainage.

Metal Cover

Equipment

Support

Roof Curb

Equipment Support

Placing Evaporative Module

Securing Evaporative Module

1. Locate Equipment Support(s)

Position equipment support(s) on the roof (reference the

CAPS submittal for placement of equipment support(s)

in relation to the

unit). Verify that

all unit supports

are level, shim if

necessary. Attach

equipment support

to the roof, remove

metal cover, flash

to wooden nailer

and reinstall cover.

4. Secure Cooling Module to Unit

Use self-tapping screws to fasten the cooling module to

the base unit along the top and down both sides. Fasten

at the top through the flanges. To fasten the sides, the

media must be removed. To remove the media, first

remove the access panel on the evaporative module

and disconnect the evaporative pump(s). The media

will now slide out. With the media removed, you can

access the side fastening points inside the evaporative

module. With all the screws in place, reinstall the media,

reconnect the pumps and reinstall the access panel.

Sealant

3. Set Evaporative Cooling Module

Use a crane and a set of spreader bars hooked to the

factory lifting lugs to lift and center the module on the

equipment support(s). The flange on the evaporative

cooler should overlap the flange on the unit.

2. Apply Sealant

Apply an appropriate sealant around the airstream

opening to create an air tight seal.

8 ®

Model MSX Make-Up Air

Installation of Electrical Wiring

IMPORTANT

Before connecting power to the unit, read and

understand the following instructions and wiring

diagrams. Complete wiring diagrams are attached

on the inside of the control center door(s).

IMPORTANT

All wiring should be done in accordance with the

latest edition of the National Electric Code ANSI/

NFPA70 and any local codes that may apply. In

Canada, wiring should be done in accordance with

the Canadian Electrical Code.

IMPORTANT

The equipment must be properly grounded. Any

wiring running through the unit in the airstream must

be protected by metal conduit, metal clad cable or

raceways.

CAUTION

If replacement wire is required, it must have a

temperature rating of at least 105°C, except for an

energy cut-off or sensor lead wire which must be

rated to 150°C.

DANGER

High voltage electrical input is needed for this

equipment. This work should be performed by a

qualified electrician.

CAUTION

Any wiring deviations may result in personal injury

or property damage. Greenheck is not responsible

for any damage to, or failure of the unit caused by

incorrect final wiring.

IMPORTANT

Greenheck’s standard control voltage is 24VAC.

Control wire resistance should not exceed

0.75ohms (approximately 285 feet total length for

14gauge wire; 455 feet total length for 12gauge

wire). If the resistance exceeds 0.75 ohms, an

industrial-style plug-in relay should be wired in

place of the remote switch. The relay must be

rated for at least 5 amps and have a 24 VAC coil.

Failure to comply with these guidelines may cause

motor starters to chatter or not pull in, resulting in

contactor failures and/or motor failures.

1. Determine the Size of the Main Power

Lines

The unit’s nameplate states the voltage and the unit’s

MCA. The main power lines to the unit should be sized

accordingly. The nameplate is located on the outside

of the unit on the control panel side.

2. Provide the Opening(s) for the

Electrical Connections

Electrical openings vary by unit size and arrangement

and are field supplied.

3. Connect the Main Power

Connect the main power lines to the disconnect switch

and main grounding lug(s). Torque field connections to

20in.-lbs.

4. Wire the Optional Convenience Outlet

The convenience outlet requires a separate 115 volt

power supply circuit. The circuit must include short

circuit protection which may need to be supplied by

others.

5. Wire the Optional Accessories

Reference the Ladder Diagram on the inside of the

control center door for correct wiring of the following

accessories:

• Blower Switch

• Heat Switch

• Indicating Lights

• Dirty Filter Indicator

• TSCP

• KSCP

NOTE

TSCP has number-to-number wiring.

NOTE

Large evaporative coolers may require a separate

power supply.

6. Wire the Optional Evaporative Cooler

Reference the Ladder Diagram on the inside of the

control center door for correct wiring of the pump and

the optional auto-drain and flush.

SUP HP

MCA

EXH HP

MOP

VOLTS HZ PH

Unit’s Total MCA

Voltage, Hertz, Phase

SUP HP

MCA

EXH HP

MOP

VOLTS HZ PH

Voltage, Hertz, Phase

Electrical Nameplate

9

®Model MSX Make-Up Air

Installation of Electric Heater

(optional)

WARNING

Electrical Shock Hazard! Disconnect all power

sources before doing any work on the unit.

Effect of Low Voltage on Wattage and

British Thermal Unit (BTU)

The heating elements may be used on voltages

lower than the design voltage of the heater, however,

the wattage and BTU output will be reduced to the

percentages listed in the table below.

1 For 7-24 conductors in raceway or cable, reduce allowable

heater line currents to 87½% of those shown above.

2 Based on 30°C. (86°F.) ambient temperature, for higher

ambient temperature see National Electric Code table

310-16 and 310-18 Note 13.

3 Based on 80% of ratings in the National Electric Code

table 310-16 for 75°C insulation.

De-rated Wattage For Low Voltage

Heater

Voltage

Line

Voltage

% of

Heater

Wattage

and BTU

Heater

Voltage

Line

Voltage

% of

Heater

Wattage

and BTU

480 460 92 208 200 92

440 84 190 83

277 265 92 120 115 92

254 84 110 84

240 230 92

220 84

208 75

200 69

Supply Wire Size

(Not more than six conductors in Single Conduit

1)

AWG or

MCM

Max. Heater

Line Current

2

AWG or

MCM

Max. Heater

Line Current

2

Copper

3Copper

3

14 12 0000 184

12 16 250 204

10 24 300 228

8 36 350 248

6 52 400 268

4 68 500 304

3 80 600 336

2 92 700 368

1 104 750 380

0 120 800 392

00 140 900 416

000 160 1000 436

General:

The requirements and practices described below

are based on the National Electric Code (NEC) and

The Space Heating Standard of the Underwriters

Laboratories Inc. (UL). Although UL requirements

are uniform throughout the country, local electrical

codes may deviate from the National Electrical Code.

Therefore, local inspection authorities should be

consulted regarding local requirements.

Electrical Wiring Instructions:

1. Use the wiring diagram supplied with the heater

as a guide in correlating field wiring with the

heater internal wiring.

2. All field wiring to the heater must meet the

requirements of the National Electric Code and

any other applicable local or state codes.

3. Wiring to the heater must be rated for 75°C

(167°F) minimum.

4. The fan is interlocked by the factory to the

control circuit so the electric heater will not

operate unless the fan is on.

5. If heater does not have a built-in disconnect

switch or main circuit breaker, install a remote

disconnect (furnished by others) in accordance

with the National Electric Code, Article 424-65.

Calculation of Line Currents (amps):

Single Phase Current = watts

volts

EXAMPLE: 5 kW, 208 volt

5000 watts = 24 amps

208 volts

Three Phase Current = watts

volts x 1.73

EXAMPLE: 14.4 kW, 208 volt

14400 watts =14400 = 40 amps

208 volts x 1.73 360

Sizing of Supply Conductors

The required minimum size of supply conductors

is marked at the field wiring terminals within the

heater control box or reference the Supply Wire Size

table included in this section. The wire gauges are

calculated for 125% of the heater line current as

required by the National Electric Code, Article 424-3(b)

based on conductor insulation rated for 75°C (167°F).

10 ®

Model MSX Make-Up Air

Installation Evaporative Cooler

Piping (optional)

IMPORTANT

All supply solenoids, valves and all traps must be below

the roof line or be otherwise protected from freezing.

IMPORTANT

The supply line should be of adequate size and

pressure to resupply the amount of water lost due to

bleed-off and evaporation. The drain line should be

the same size or larger than the supply line.

CAUTION

Provisions must be taken to prevent damage to the

evaporative cooling section during freezing conditions.

The sump, drain lines and supply lines must be

drained prior to freezing conditions or an alternate

method must be used to protect the lines and media.

Evaporative Cooling with Recirculating Pump

1. Install the Water Supply Line

Supply line opening requirements vary by unit size

and arrangement and are field supplied. Connect the

water supply line to the float valve through the supply

line opening in the evaporative cooling unit. Install a

manual shutoff valve in the supply line as shown.

2. Install the Drain Line

Connect an unobstructed drain line to the drain and

overflow connections on the evaporative cooler. A

manual shut off valve (by others) is required for the

evaporative cooler

drain line.

A trap should be

used to prevent

sewer gas from

being drawn into

the unit.

3. Check/Adjust Water Level

Check the water level in the sump tank. The water

level should be above the pump intake and below the

overflow. Adjust the float as needed to achieve the

proper water level.

Supply

Line

Overflow

Trap

Drain Line Valve

(Normally Open)

Drain Line

Supply

Line Valve

(Normally

Closed)

Recirculating Evaporative Piping

6 in. min.

6 in. min.

Drain Trap

Evaporative Cooling with Auto Drain and Fill

Auto Drain & Flush Valves

(When provided by Greenheck)

Assembly

Number

GFC

Part

Number

ASCO

Part

Number

Solenoid

Type

De-Energized

Position

Diameter

Qty.

852178

461262 8210G2

Supply Closed

1/2 inch

(12.7 mm)

1

461263 8262G262

Supply

Line

Drain

Open

1/4 inch

(6.35 mm)

1

461264 8210G35

Sump

Drain Open

3/4 inch

(19.05 mm)

1

Part numbers subject to change.

IMPORTANT

The supply line should be of adequate size and

pressure to resupply the amount of water lost due to

bleed-off and evaporation. The drain line should be

the same size or larger than the supply line.

CAUTION

All solenoids valves and traps must be installed below

the roof to protect the supply water line from freezing.

If they cannot be installed below the roof, an alternative

method must be used to protect the lines from freezing.

IMPORTANT

The supply solenoid (Valve A) is NOT the same as

the drain solenoids (Valve B and Valve C). Make sure

to use the proper solenoid for each location. Check

your local code requirements for proper installation

of this type of system.

Auto Drain & Fill Evaporative Piping

Supply

Line

VALVE B

Supply Line Drain Solenoid

(Normally Open)

Sump Overflow

Sump Drain

VALVE C

Sump Drain Solenoid

(Normally Open)

VALVE A

Supply Solenoid

(Normally Closed)

Drain Line

Trap

11

®Model MSX Make-Up Air

Evaporative Cooling with Auto Drain and Fill

continued

1. Install the Water Supply Line

Supply line opening requirements vary by unit size

and arrangement and are field supplied. Connect the

water supply line to the float valve through the supply

line opening in the evaporative cooling unit. Install the

1/2 in. normally closed solenoid (Valve A) in the supply

line. Install the 1/4 in. normally open solenoid (Valve

B) between the supply line and the drain line. Refer

to Auto Drain & Fill Evaporative Piping drawing on

previous page.

2. Install the Drain Line

Connect an unobstructed drain line to the sump drain

overflow connection. Install the 3/4 in. normally open

solenoid (Valve C)

between the sump

drain connection

and the drain line.

A trap should be

used to prevent

sewer gas from

being drawn into

the unit.

3. Check/Adjust Water Level

Check the water level in the sump tank. The water

level should be above the pump intake and below the

overflow. Adjust the float as needed to achieve the

proper water level.

6 in. min.

6 in. min.

Drain Trap

12 ®

Model MSX Make-Up Air

Installation of Water WizardTM (optional)

Evaporative Cooling with the Water Wizard™

1. Install Normally Closed Supply Line/

Solenoid

Connect the water supply line to the manual supply

valve in the unit. Install the supply solenoid in the

supply line, upstream of the manual supply valve and

below the roof line.

2. Install Normally Open Drain Line/

Solenoid

Connect the drain line to the supply line between the

manual supply valve and the supply solenoid. Install a

drain solenoid in the drain line, below the roof line. A

trap should be installed in the drain line.

3. Wire the Solenoid(s)

Wire the supply line solenoid and drain solenoid as

shown on the unit’s wiring diagram in the control

center.

4. Wire the Temperature Sensor

If the evaporative cooler shipped separate from the

unit, the temperature sensor must be wired. The

sensor wire is bundled inside the discharge end of the

evaporative cooler. Wire the sensor wire to terminals

AI2 and AIC on the terminal strip in the unit’s control

center.

NOTE

The following instructions are provided for evaporative

coolers equipped with the Water Wizard™ only.

Additional instructions are provided for evaporative

coolers equipped with the auto-drain and fill or

bleed-off.

WARNING

Disconnect and lock-out all power and gas before

performing any maintenance or service to the unit.

Failure to do so could result in serious injury or

death and damage to equipment.

NOTE

Solenoid(s) may be provided by Greenheck (if

ordered) or by others.

CAUTION

Any wiring deviations may result in personal injury

or property damage. Greenheck is not responsible

for any damage to, or failure of the unit caused by

incorrect final wiring.

NOTE

The Water Wizard™ start-up must be completed for

proper performance.

Water Wizard™ Valves

(When provided by Greenheck)

Unit

Model

Assembly

Number

GFC

Part

No.

ASCO

Part No.

Solenoid

Type

De-

Energized

Position

Diameter Qty.

MSX -

H12/H22

MSX - H32

(<9000 cfm)

852370

461262 8210G2

Supply Closed

1/2 inch

(12.7 mm)

1

383086 8210G34

Supply

Line

Drain

Open

1/2 inch

(12.7 mm)

1

MSX - H32

(≥9000 cfm)

MSX-H35,

H38, H42

852371

383088 8210G9

Supply Closed

3/4 inch

(19.05 mm)

1

383086 8210G34

Supply

Line

Drain

Open

1/2 inch

(12.7 mm)

1

Part numbers subject to change.

Water Wizard™ Installation

Supply Line Drain Solenoid

(Normally Open)

Supply Solenoid

(Normally Closed)

Manual Supply

Valve

Pressure

Gauge

To Media

Sump Drain

Roof

Line

Trap Field

Installed

Factory

Installed

13

®Model MSX Make-Up Air

3. Install Suction Line

Install suction line(s) from the compressor to the

suction connection(s) which are stubbed through the

side of the cabinet.

4. Install the Liquid Line and Thermal

Expansion Valve (TEV) (by others)

Liquid line openings vary by coil size and

circuiting and are field supplied. Follow the TEV

recommendations for installation to avoid damaging

the valve. If the valve is externally equalized, use a

tubing cutter to cut off the plugged end of the factory

installed equalizer line. Use a de-burring tool to

remove any loose metal from the equalizer line and

attach it to the TEV. If the valve is internally equalized,

the factory installed equalizer line can be left as is.

5. Mount the Remote Sensing Bulb

(by others)

The expansion valve’s remote sensing bulb should be

securely strapped to the horizontal run of the suction

line at the 3 or 9 o’clock position and insulated.

6. Check Coil Piping for Leaks

Pressurize the coil to 100 psig with dry nitrogen or

other suitable gas. The coil should be left pressurized

for a minimum of 10 minutes. If the coil holds the

pressure, the hook-up can be considered leak free.

If the pressure drops by 5 psig or less, re-pressurize

the coil and wait another 10 minutes. If the pressure

drops again, there is likely one or more small leaks

which should be located and repaired. Pressure losses

greater than 5 psig indicate a large leak that should be

isolated and repaired.

7. Evacuate and Charge the Coil

Use a vacuum pump to evacuate the coil and any

interconnecting piping that has been open to the

atmosphere. Measure the vacuum in the piping using

a micron gauge located as far from the pump as

possible. Evacuate the coil to 500 microns or less,

and then close the valve between the pump and the

system. If the vacuum holds to 500 microns or less

1. Locate the Distributor(s) by Removing

the Distributor Access Panel

Distributor Access Panel

Installation of Direct Expansion (DX)

Coil Piping (optional)

IMPORTANT

Guidelines for the installation of direct expansion

cooling coils have been provided to insure proper

performance and longevity of the coils. These are

general guidelines that may have to be tailored

to meet the specific requirements of any one job.

As always, a qualified party or individual should

perform the installation and maintenance of any coil.

Protective equipment such as safety glasses, steel

toe boots and gloves are recommended during the

installation and maintenance of the coil.

IMPORTANT

All field brazing and welding should be performed

using high quality materials and an inert gas purge

(such as nitrogen) to reduce oxidation of the internal

surface of the coil.

IMPORTANT

All field piping must be self-supporting and flexible

enough to allow for the thermal expansion of the coil.

NOTE

If a hot gas bypass kit was provided by others, refer

to the manufacturer’s instructions.

General Installation

Expansion

Valve (by others)

Liquid Line

Thermal

Nozzle

Suction Header Coil

Distributor

Equalizer Line

Suction Line

Remote Sensing Bulb Straps

Suction Connection

2. Verify Nozzle Placement

Inspect the refrigerant

distributor and verify

that the nozzle is in

place. The nozzle is

generally held in place

by a retaining ring or is

an integral part of

the distributor itself.

Retainer

Ring Nozzle Distributor

Nozzle Placement

(by others)

(by others)

Installation with Hot Gas Bypass

Thermal

14 ®

Model MSX Make-Up Air

for one minute, the system is ready to be charged or

refrigerant in another portion of the system can be

opened to the coil. A steady rise in microns would

indicate that moisture is still present and that the coil

should be further vacuumed until the moisture has

been removed.

8. Install the Drain Line

Connect an

unobstructed drain

line to the drain

pan. A trap should

be used to prevent

sewer gas from being

drawn into the unit.

NOTE

Failure to obtain a high vacuum indicates a great

deal of moisture or a small leak. Break the vacuum

with a charge of dry nitrogen or other suitable

gas and recheck for leaks. If no leaks are found,

continue vacuuming the coil until the desired

vacuum is reached.

IMPORTANT

All traps must be installed below the roof line or be

otherwise protected from freezing.

6 in. min.

6 in. min.

Drain Trap

6 in. min.

6 in. min.

Drain

Trap

Installation of Chilled Water Coil

Piping (optional)

1. Verify Coil Hand Designation

Check the coil hand

designation to ensure that

it matches the system.

Coils are generally

plumbed with the supply

connection located on

the bottom of the leaving

air-side of the coil and the

return connection at the top of the entering air-side

of the coil. This arrangement provides a counter flow

heat exchanger and positive coil drainage.

2. Check the Coil for Leaks

Pressurize the coil to 100 psig with dry nitrogen or

other suitable gas. The coil should be left pressurized

for a minimum of 10 minutes. If the coil holds the

pressure, the hook-up can be considered leak free.

If the pressure drops by 5 psig or less, re-pressurize

the coil and wait another 10 minutes. If the pressure

drops again there is likely one or more small leaks

which should be located and repaired. Pressure losses

greater than 5 psig indicate a large leak that should be

isolated and repaired.

3. Connect the Supply and Return Lines

Connect the supply and return lines as shown above.

4. Install the Drain Line

Connect an unobstructed

drain line to the drain pan.

A trap should be installed

to prevent sewer gas from

being drawn into the unit.

Hot Return

Connection

Cold Supply

Connection

Entering Air Leaving Air

IMPORTANT

Guidelines for the installation of the cooling coil

have been provided to insure proper performance

of the coils and their longevity. These are general

guidelines that may have to be tailored to meet the

specific requirements of any one job. As always,

a qualified party or individual should perform the

installation and maintenance of the coil. Protective

equipment such as safety glasses, steel toe boots

and gloves are recommended during the installation

and maintenance of the coil.

When installing couplings, do not apply undue

stress to the connection. Use a backup pipe

wrench to avoid breaking the weld between the coil

connection and the header.

All field piping must be self-supporting. System

piping should be flexible enough to allow for the

thermal expansion and contraction of the coil.

IMPORTANT

All traps must be installed below the roof line or be

otherwise protected from freezing.

15

®Model MSX Make-Up Air

Installation of Building Pressure

Control (optional)

1. Mount Pressure Tap

Using the factory provided bracket, mount the

pressure tap to the

outside of the unit.

Choose a location

out of the prevailing

winds and away from

supply or exhaust

fans to assure

accurate readings.

2. Run Pressure Tap Lines

Run a pressure tap line from the pressure tap on the

outside of the unit to the low pressure tap on the back

of the photohelic gauge. Run a second pressure tap

line from the high pressure tap on the back of the

photohelic gauge to the space. Fifty feet of tubing is

supplied with the unit.

3. Set the Building Pressure

The pressure gauge is used to set the desired building

pressure. The pressure is set by adjusting the knobs

for the upper and lower pressure limits. Typical

settings are 0.0 inch wc for the lower and 0.10 inch wc

for the upper pressure setting.

Connections for Photohelic Gauge

Factory

Wiring

High Pressure

Tap

to Space

Low Pressure

Tap

to Outside

Typical Photohelic Gauge Settings

Pressure Setting Knobs

Pressure Setting

Needles

Pressure Indicating

Needle

16 ®

Model MSX Make-Up Air

Start-Up - Blower

1. Check the Voltage

Before starting the unit, compare the supplied voltage,

hertz, and phase with the unit and motor’s nameplate

information.

2. Check the Blower Rotation

Open the blower access door

and run the blower momentarily

to determine the rotation.

Arrows are placed on the

blower scroll to indicate the

proper direction or reference

the example shown to the right.

Refer to the Start-Up Checklist in the Reference

section before proceeding further!

Pre Start-Up Check

Rotate the fan wheel by hand and make sure no parts

are rubbing. Check the V-belt drive for proper alignment

and tension (a guide for proper belt tension and

alignment is provided in the Belt Maintenance section).

Check fasteners, set screws and locking collars on the

fan, bearings, drive, motor base, and accessories for

tightness.

SPECIAL EQUIPMENT REQUIRED

Required and recommended tools. Equivalent

products may be used.

Voltage &

Amperage

Meter

Manufacturer: Fluke

Model: 177

Phone: 1-800-44-FLUKE

www.fluke.com

Thermometer

Manufacturer: Fluke

Model: 50

Phone: 1-800-44-FLUKE

www.fluke.com

Micro Amp

Meter

Manufacturer: Fluke

Model: 116

Phone: 1-800-44-FLUKE

www.fluke.com

U-Tube

Manometer

Manufacturer: Dwyer

Model: Slack Tube

Phone: 1-219-897-8000

www.dwyer-inst.com

Tachometer

Manufacturer: Monarch

Model: Pocket Tach 100

Phone: 1-800-999-3390

www.monarchinstrument.com

WARNING

Check the housing, blower, and ductwork for any

foreign objects before running the blower.

NOTE

To reverse the rotation on three phase units,

disconnect and lock-out the power, then

interchange any two power leads.

NOTE

To reverse the rotation on single phase units,

disconnect and lock-out the power, then rewire the

motor per the manufacturer’s instructions.

IMPORTANT

If the blower is rotating in the wrong direction, the

unit will move some air, but will not perform as

designed. Be sure to perform a visual inspection to

guarantee the correct blower rotation.

WARNING

Disconnect and lock-out all power and gas before

performing any maintenance or service to the unit.

Failure to due so could result in serious injury or

death and damage to equipment.

3. Check for Vibration

Check for unusual noise, vibration or overheating of

the bearings. Reference the Troubleshooting section

for corrective actions.

4. Motor Check

Measure the motor’s voltage, amps and RPM.

Compare to the specifications. Motor amps can be

reduced by lowering the motor RPM or increasing

system static pressure.

IMPORTANT

Excessive vibration may be experienced during

the initial start-up. Left unchecked, it can cause a

multitude of problems including structural and/or

component failure.

IMPORTANT

Generally, fan vibration and noise is transmitted

to other parts of the building by the ductwork. To

minimize this undesirable effect, the use of heavy

canvas duct connectors is recommended.

IMPORTANT

Additional starters and overloads may be provided

in the make-up air control center for optional

exhaust blowers. Any additional overloads must be

checked for proper voltage, amps and RPMs.

Electrical Nameplate

SUP HP

MCA

EXH HP

MOP

VOLTS HZ PH

Unit’s Total MCA

Voltage, Hertz, Phase

SUP HP

MCA

EXH HP

MOP

VOLTS HZ PH

Voltage, Hertz, Phase

Blower Rotation

Blower

Housing

R

o

t

a

t

i

o

n

17

®Model MSX Make-Up Air

6. Set-Up Optional Components

Adjust the settings on the optional components. See

the Control Center Layout in the Reference section for

location of optional components.

• Heating Inlet Air Sensor

Typical setting: 60-70°F (15-21°C)

• Cooling Inlet Air Sensor

Typical setting: 75°F (24°C)

• Building Freeze Protection

Typical setting: 5 minutes; 45°F (7°C)

• Dirty Filter Gauge

Typical setting: Settings vary greatly for each unit.

(see Reference section for adjusting information)

NOTE

The most accurate way to measure the air volume is

by using a pitot traverse method downstream of the

blower. Other methods can be used but should be

proven and accurate.

IMPORTANT

Changing the air volume can significantly increase

the motor’s amps. If the air volume is changed,

the motor’s amps must be checked to prevent

overloading the motor.

NOTE

To ensure accuracy, the dampers are to be open

when measuring the air volume.

5. Air Volume Measurement & Check

Measure the unit’s air volume (cfm) and compare it with

it’s rated air volume. If the measured air volume is off,

adjust the fan’s RPM by changing/adjusting the drive.

18 ®

Model MSX Make-Up Air

1. Check the Voltage

Before starting the heater, compare the supplied

voltage, hertz, and phase with the heater’s nameplate

information.

2. Airflow Interlock

With the supply fan on, verify the electric heater’s

airflow interlock (DDS) is made.

3. Set the Unit’s Operating Temperature

Set the operating temperature by adjusting the

discharge temperature selector. Typical settings are

65-70°F (18-21°C).

Start-Up - Electric Heater (optional)

WARNING

Disconnect and lock-out all power before

performing any maintenance or service to the unit.

Failure to due so could result in serious injury or

death and damage to equipment.

NOTE

If the heater is equipped with an optional inlet

air sensor the heater will not energize unless the

outdoor air temperature is less than the inlet air

sensor’s set point.

Refer to the Start-Up Checklist in the Reference

section before proceeding further!

Pre Start-Up Check

Check all electrical connections. Tighten any loose

connection to all components including contactors,

heating elements and main power lugs.

19

®Model MSX Make-Up Air

1. Check the Installation

The media may have been removed during installation,

so its orientation

should be double

checked. The

media should

be installed with

the steeper flute

angle sloping

down towards

the entering air

side.

Verify that the stainless steel caps and distribution

headers are in place. The headers should be located

over the media towards the entering air side. The caps

should be placed over the headers.

2. Check the Pump Filter

Check that the pump filter is around the pump inlet.

3. Fill the Sump and Adjust the Float

Turn on the water supply and allow the sump tank to

fill. Adjust the float valve to shut-off the water supply

when the sump is filled to within 1 inch of the bottom

of the overflow.

4. Break-in the Media

Open the bleed-off valve completely and saturate

the media with the blower(s) off for no less than 20

minutes.

5. Check the Flow Rate

The pumps should provide enough water to saturate

the media in 45 to 60 seconds. Consult the factory, if

adequate flow is not achieved.

6. Adjust the Water Bleed-Off Rate

The water bleed-off rate is dependent on the water’s

mineral content. The bleed-off should be adjusted

based on the media’s mineral deposits after two

weeks of service.

7. Set the Optional Auto Drain and Fill

Set the auto drain, fill timer and temperature settings.

Timer settings are: t1: 1.0, 10min

t2: 0.4, 60h

Temperature is typically set to 45°F (7°C)

Start-Up - Evaporative Cooling

Recirculating (optional)

Bleed-Off

Valve

Overflow

Pump

Filter

Threaded Float

Adjustment

Supply

Connection

Float

Valve

Evaporative

Timer

t2 settings

t1 settings

Evaporative Freeze

Protection

Temperature

Setting

8. Put the Unit into Service

Remove the jumper, and energize the blower(s). Verify

proper operation.

IMPORTANT

Check the media for minerals after two weeks of

service and adjust the bleed-off rate accordingly.

Leaving Air

Entering Air

45º

15º

Media Orientation

Evaporative Cooler Set-Up

NOTE

A jumper will need to be installed in the control

center to power the evaporative pumps with the

blower(s) off. Reference the unit’s ladder diagram to

determine proper terminals.

20 ®

Model MSX Make-Up Air

Water Wizard™ User Interface

Key Function Description

Function Key

Recommended Water Pressure Chart

Housing

Size

Media Width

(inches)

Water Pressure

(in. wc)

MSX-H12 30 20

MSX-H22 433⁄436

60 61

MSX-H32 66 72

96* 42

MSX-H35 120* 61

MSX-H38 180* 37

MSX-H42 216* 51

*Multiple media sections. Values represent total media width.

WARNING

Opening the manual supply valve will allow water

to pass to the media. Be sure the sump is safely

draining before opening the manual supply valve.

NOTE

The manual supply valve ships closed and must be

adjusted for proper performance.

NOTE

The recommended water pressure is based on

media width. Refer to the table provided for proper

water pressure settings.

Start-Up - Water Wizard™ (optional)

Program Display

NOTE

Steps 6 through 8 are provided to adjust the

minimum cooling temperature. The minimum cooling

is preset to the factory recommended 75°F (24°C).

Only adjust if needed.

NOTE

The inlet air sensor function overrides and shuts

down the evaporative cooler if the outside

temperature falls below the minimum cooling

temperature.

7. Adjust the Minimum Cooling

Temperature

While in the

Program Menu,

use the Up and

Down Keys to

navigate the

Menu Options

until “toF” is

displayed. Press the

Enter Key to access the selected Menu Option setting.

Use the Up and Down Keys to adjust the Minimum

Cooling Temperature as needed. Press the Enter Key

to save the Minimum Cooling Temperature setting and

return to the Program Menu.

8. Exit Program Mode

After 15 seconds of idle time the controller will exit

Program Mode.

Minimum Cooling

Temperature Display

NOTE

The enter key must be pressed to save the new

minimum cooling temperature.

5. Check Media

Start the cooling cycle and check the media after one

hour of operation. If the media is continuously dry or if

too much water is draining from the sump tank, refer

to Troubleshooting, Water Wizard™.

6. Enter Program Mode

Press and hold

the Enter Key

for three seconds. The

display will read “Pro”

when Program Mode is

active.

L1 L2 L3

Enter Key

Up Key

Down Key

1. Open the Solenoid

Confirm that the manual water supply valve

is closed. Press and hold the Function Button

for one second. L3 will begin blinking (short on, long

off), indicating that Flow Test Mode is active and the

supply solenoid is open.

2. Set the Water Pressure

With the solenoid open, set the supply water

pressure to the correct setting (see table below).

Use the manual supply valve to adjust the supply

pressure. A pressure gauge is provided between the

manual supply valve and the media.

3. Break-in Media

Leave the supply solenoid open to saturate and

break-in media for 20 minutes with the blower off.

4. Close Solenoid

With the pressure set, press the Function Key

for one second to deactivate Flow Test Mode

and allow the supply solenoid to close.

21

®Model MSX Make-Up Air

NOTE

The Freeze Temperature is preset to the factory

recommended 45°F. Steps 9-11 should only be

completed if the Freeze Temperature needs adjustment.

NOTE

The Freeze Temperature is the temperature at which the

supply solenoid closes and the drain solenoid opens

to drain the supply line, preventing possible freeze

damage. A drain solenoid is required for this option.

9. Enter Program Mode

Press and hold

the Enter Key

for three seconds. The

display will read “Pro”

when Program Mode is

active.

10. Adjust the Freeze Temperature

While in Program Mode, use the Up and Down

Keys to navigate

through the Menu

Options until

“Frt” is displayed.

Press the Enter

Key to access the

selected Menu Option

setting.

Use the Up and Down Keys to adjust the Freeze

Temperature setting as needed. Press the Enter Key to

set the Freeze Temperature and return to the Program

Menu.

11. Exit Program Mode

After 15 seconds of idle time the controller will exit

Program Mode.

Program Display

Freeze Temperature

Display

NOTE

The enter key must be pressed to save the new

freeze temperature.

22 ®

Model MSX Make-Up Air

Building Pressure Control —

a variable frequency drive is

controlled according to input

from a pressure sensing device.

Turn both knobs to the upper

most pressure setting. You may

have to remove the outdoor

pressure tap tubing. VAV systems

should go to maximum speed.

Set both knobs at the lowest

setting and the VAV systems

should go to minimum speed.

Reset the correct pressure limits

before starting the unit.

This picture depicts a

typical photohelic setting.

Typical settings are 0.0 inch

wc for the lower pressure

setting and 0.10 inch wc for

the upper pressure setting.

The needle indicates a

negative building pressure.

During correct operation,

the indicating needle will

remain between or near the

setting needles.

External Signal — a variable frequency drive is

controlled according to input from an external 2-10

VDC or 4-20 mA signal (by others).

A 2 VDC or 4 mA signal will send the blower to low

speed. The blower will go to maximum speed with a

10 VDC or 20 mA signal.

Variable Kitchen Control — a variable frequency

drive is controlled by input from a remote speed

control. This unit allows automatic adjustment of

make-up air volumes based on varying cooking loads.

With Maxitrol 44 Room Thermostat

70

65

75

80

85

90

60

55

(OPTIONAL)

BLOWER

DIRTY FILTERS

MAIN VALVES

EXHAUST

SUPPLY

HEAT

(OPTIONAL)

GREENHECK

®

PHOTOHELIC

Building

Pressure Control

Pressure Setting Knobs

Pressure Setting

Needles

Pressure Indicating

Needle

Photohelic Gauge

NOTE

Blower Start-Up, Steps 1-5 should be performed

before the blower is run.

NOTE

For maintenance issues associated with variable

frequency drives, consult the drive’s manual

supplied with the unit. The drives are programmed

at the factory and should not need any adjustment

during installation and start-up. For kitchen

applications, the drive may be located in the kitchen

or in the unit.

Modulating

Potentiometer Control — a variable frequency drive

is controlled by input from a remote

speed selector (potentiometer).

This unit allows easy manual

adjustment of make-up air

volumes. To test potentiometer

operation, turn the potentiometer

to the two extremes. With variable

volume, make sure the fan goes to

maximum and minimum speed.

When the potentiometer is at 0, the

fan speed will be at its minimum.

When the potentiometer is at 100,

the fan will be at its maximum

speed.

2-Speed

A variable frequency drive (VFD) is used to control

air volumes. The VFD can be switched to low or high

speed from a remote control panel. Turn the fan speed

switch on the remote control panel to each position

and confirm that the fan speed adjusts accordingly.

Variable Volume Operation

The variable volume option is recommended when

a building’s exhaust volume may vary. This option

enables the make-up air volume to track with the

exhaust volume, providing only the amount of make-

up air required. Control strategies include 2-speed and

modulating blowers. Before the unit is left in service,

the variable volume control system should be tested.

70

65

75

80

85

90

60

55

(OPTIONAL)

BLOWER

DIRTY FILTERS

MAIN VALVES

EXHAUST

SUPPLY

HEAT

(OPTIONAL)

GREENHECK

®

With Maxitrol 44 Room Thermostat

Potentiometer

Control

Check Operation - VAV Units

(optional)

23

®Model MSX Make-Up Air

Check Operation - Recirculating

Units (optional)

NOTE

Blower Start-Up, steps 1-5 should be performed

before the blower is run.

Recirculation Operation

The recirculation operation option is recommended

when the ventilation equipment provides the primary

source of heating for the space. Recirculation can

vary from 100% return air to 100% outside air. Control

strategies include 2-position and modulating dampers.

Before the unit is left in service, the recirculation

control system should be tested.

Modulating

Potentiometer Control — a modulating spring return

actuator is used to control the return air amounts. The

return air damper modulates from fully open to fully

closed based on a signal from a remote potentiometer.

To test potentiometer operation,

turn the potentiometer to the two

extremes. Confirm that the return

air damper fully opens and fully

closes. When the potentiometer

is at 0, the return air damper will

open. When the potentiometer is

at 100, the return air damper will

close. The damper actuator may

take a few minutes to open or

close.

2-Position Damper

A 2-position spring return actuator is used to control

the return air amounts. The damper moves from open

to closed. If power is cut to the

unit, the outdoor air damper will

fail to close.

Turn the recirculating switch

on the remote control panel to

each position and confirm that

the return air damper adjusts

accordingly. The damper actuator

may take a few minutes to open

or close.

With Maxitr ol 44 Room Thermostat

70

65

75

80

85

90

60

55

GREENHECK

®

(OPTIONAL)

BLOWER

DIRTY FIL TERS

MAIN V AL VES

RECIRCULA TION

EXHAUST

SUPPL Y

HEA T

(OPTIONAL)

2-Position

Damper Control

70

65

75

80

85

90

60

55

(OPTIONAL)

BLOWER

DIRTY FILTERS

MAIN VALVES

EXHAUST

SUPPLY

HEAT

(OPTIONAL)

GREENHECK

®

With Maxitrol 44 Room Thermostat

Potentiometer

Control

With Maxitrol 44 Room Thermostat

70

65

75

80

85

90

60

55

(OPTIONAL)

BLOWER

DIRTY FILTERS

MAIN VALVES

EXHAUST

SUPPLY

HEAT

(OPTIONAL)

GREENHECK

®

PHOTOHELIC

Building

Pressure Control

Building Pressure Control — a

modulating spring return actuator

is used to control the return air

amounts. The return air damper

modulates from fully open to fully

closed based on a signal from a

remote pressure sensing device.

Turn both knobs to the upper

most pressure setting. You may

have to remove the outdoor

pressure tap tubing. The return air

damper should close.

Set both knobs at the lowest setting and the damper

should open. It may take one to two minutes for the

damper to reach the desired position.

Reset the correct pressure limits before starting the

unit.

This picture shows a typical

photohelic setting. Typical

settings are 0.0 inch wc

for the lower and 0.10 inch

wc for the upper pressure

setting. The needle in this

photo indicates a negative

building pressure. During

correct operation, the

indicating needle will remain

between or near the setting

needles.

External Signal — a modulating spring return

actuator is used to control the return air amounts.

Return air damper modulates from fully open to fully

closed based on an external 2-10 VDC or 4-20 mA

signal (by others).

The return air damper will close with a 10 VDC or

20mA signal. The return air damper should open with

a 2VDC or 4mA signal. The damper actuator may take

a few minutes to open or close.

Pressure Setting Knobs

Pressure Setting

Needles

Pressure Indicating

Needle

Photohelic Gauge

24 ®

Model MSX Make-Up Air

Operation - Electrical

Electrical Sequence

1. Exhaust Fan Contact (S1) Closed

(optional)

• Power passes through N.C. contact on exhaust

fan overload (ST2 OL), which is closed if

exhaust fan (M2) has not overloaded

• Power passes to exhaust fan starter (ST2)

• N.O. contact on exhaust fan starter (ST2) is

energized and closed

• Power passes to exhaust fan

• Exhaust fan (M2) starts

2. Supply Fan Contact (S2) Closed

• Power passes through N.C. eld supplied re

contact (FSC)

• Power passes through optional N.O. contact on

exhaust fan starter (ST2), which is closed when

the optional exhaust starter (ST2) is activated

• Power passes through N.C. contact on supply

starter overload (ST1 OL), which is closed if the

supply fan has not overloaded

• Power passes through N.C. contact on optional

freeze protection timer (RT4) which remains

closed if the temperature has remained above

the set point

• Power passes to and energizes optional inlet

damper (D1), which opens

• Power passes through optional N.O. damper

limit switch (DL1), which is energized and

closed when the optional inlet damper is open.

It may take several minutes for the damper to

fully open and for the damper limit switch to

close

• Power passes to and energizes fan relay (RF)

• Power passes through N.O. contact on fan relay

(RF), which closes when the fan relay (RF) is

energized

• Power passes to and energizes supply fan

starter (ST1)

• N.O. contact on supply fan starter (ST1) is

energized and closed

• Supply fan (M1) starts

3. Electric Heat Contact (S4) Closed

(optional)

• Power passes through N.O. contact on fan relay

(RF), which is energized and closed

• Power passes through N.C. contact on optional

inlet air sensor (TS4), which is closed if the inlet

air temperature is below the set point

• Power passes to and energizes heat relay (RH)

• Power passes through N.O. contact on heat

relay (RH), which closes when the heat relay

(RH) is energized

• Power passes through N.O. contact on pressure

differential switch (PDS), which closes when

proper airflow is achieved

• Power passes through N.C. automatic and

manual reset temperature cutouts (A and

M), which remain closed if the maximum

temperature has not been reached

• Power passes to and energizes operating

contactor relay (C1)

• Power passes through N.O. contacts on

operating contactor (C1), which is closed

• Electric heater modulates/stages to maintain

temperature set point

4. Evaporative Cooling Contact (S4)

Closed* (optional)

• N.O. contact on fan relay (RF) is energized and

closed

• Power passes through N.O. contact on optional

inlet air sensor (TS4), which is energized and

closed if the inlet air temperature is above the

set point

• Power passes to and energizes cool relay (RC)

• N.O. contact on cool relay (RC) is energized and

closed

• Power passes to optional evaporative cooling

pump (P1)

*If DX or chilled water coils are used rather than an evaporative

cooler, the cooling sequence of operation will depend on the coil

controls. Cooling coil controls are supplied by others.

25

®Model MSX Make-Up Air

Drain Mode

Drain Mode locks open the drain solenoid and drains

the supply line between the supply solenoid and

the media. To activate Drain Mode simultaneously,

press the Function and Enter Keys (L2 will light). To

deactivate Drain Mode and unlock the drain solenoid,

simultaneously press the Function and Enter Keys

again.

Flow Test Mode

Activating Flow Test Mode opens the supply solenoid

and allows water to pass to the manual supply

valve. To activate Flow Test Mode, press and hold

the Function Key for one second (L3 will flash). To

deactivate Flow Test Mode and allow the supply

solenoid to close, press and hold the Function Key

again for one second.

Program Mode

Program Mode allows the user to view the Program

Menu and edit the factory default settings. To access

Program Mode and view the Program Menu press and

hold the Enter key for three seconds. While viewing

the Program Menu press the Up and Down keys to

scroll through the Menu Options. To view the setting

of the selected Menu Option, press the Enter key.

To edit the setting, press the Up or Down key while

viewing the setting. To save the setting and return to

the Program Menu, press the Enter key. To return to

the Program Menu without saving the change, wait

10 seconds. To exit Program Mode from the Program

Menu, wait 10 seconds.

Function Key

L1 L2 L3

Enter Key

Up Key

Down Key

Water Wizard™ User Interface

Key Function Description

Operation - Water Wizard™ (optional)

CAUTION

The sump drain line must be clear and draining to a

safe location before using Flow Test Mode.

CAUTION

Be aware of the water level in the sump tank at all

times when using the Flow Test Mode.

WARNING

Changing the default settings will significantly affect

performance. Only change a setting after reading

and understanding this entire manual.

WARNING

The Enter key must be pressed to save any changes

made to a setting.

Dry Bulb Temperature

The dry bulb temperature is visible on the home

screen. If a number is not visible, wait 15 seconds

and use the Up and Down Keys until a number is

displayed.

Wet Bulb Temperature

To view the Wet Bulb Temperature, simultaneously

press and hold the Up and Down Keys.

Indicating Lights

Three indicating lights are located across the top

of the display to indicate the status of the Water

Wizard™.

Light Status

Indicating

Light

On Off

Blinking

(Long on,

Short Off)

Blinking

(Short on,

Long Off)

L1 Call for

cooling

No call

for

cooling

Call for

cooling.

Outdoor

temperature

lockout.

N/A

L2

Drain

solenoid

open

Drain

solenoid

closed

N/A

Supply

solenoid

open.

(Drain

solenoid

closed).

L3 Cooling

on

Cooling

off

Supply

solenoid

locked

closed

Flow test

mode active

26 ®

Model MSX Make-Up Air

Proper supply power at

main disconnect Check main voltage

(See Blower Start-Up Step #1)

Main Disconnect (DS1) Off

(Turn Main Disconnect DS1 On)

Primary fuses blown

(Replace fuses)

24 VAC between

terminals R and X?

Main Transformer (TR1) Defective

(Replace transformer)

24 VAC between

terminals G and X?

Supply Switch (S2) Off

(Turn Supply Switch (S2) On)

Fire System Contact (FSC) tripped/not installed

(Correct/Replace)

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Yes

Blower Does Not Operate

Broken fan Bbelt

(Replace. Reference Maintenance section)

Defective motor or capacitor

(Repair/Replace)

Blown motor fuse

(Replace)

One or more legs of 3 phase is out

(Restore missing legs)

24 VAC across A2 and A1 on

supply contactor (ST1)

24 VAC across

terminals 4 and X?

24 VAC across

terminals 3 and X?

Supply Fan Overload (ST1 OL) tripped

(Reset and check motor amps. Reference Blower Start-Up #4)

Optional Exhaust Fan Interlocks (ST2-ST5) open

(Correct/Replace)

(Optional) Damper Limit Switch (DL1) holding

(Wait for actuator to open fully or adjust limit switch)

(Optional) Damper Limit Switch jumper missing

(Install jumper. Reference the unit’s ladder diagram for terminals)

Fan Relay (RF) is not energized

(Check for loose connection) (Repair or replace relay)

(Optional) Freeze Protection (RT4) Tripped

(Reset)

Troubleshooting

At this time the supply contactor (ST1) should pull in,

passing power to the supply motor

and the blower should start.

27

®Model MSX Make-Up Air

Motor Overamps

Troubleshooting

Air volume too high?

Adjust drives or increase external

static pressure as needed.

(Reference Blower Start-Up Step #5)

Motor horsepower too low?

Resize motor.

Motor voltage correct?

Provide proper power supply.

(Reference Blower Start-Up Step #1)

Blower rotation correct?

Reverse blower rotation.

(Reference Blower Start-Up Step #2)

Actual static pressure

lower than design?

Adjust drives to reduce blower RPM.

(Reference Blower Start-Up Step #5)

No

No

Yes

Yes

Yes

Yes

No

Yes

No

No

Shorted windings in motor?

Replace motor.

Yes

Everything is working

properly, consult factory.

Yes

28 ®

Model MSX Make-Up Air

Insufficient Airflow

Troubleshooting

Damper(s) not fully opened?

Adjust damper linkage(s), or replace faulty actuator(s).

(Damper actuators may take a few minutes to open)

Filters dirty or clogged

Clean or replace filters.

(Reference Filter Maintenance in the Maintenance section).

Blower speed too low?

Adjust drives as needed.

(Reference Blower Start-Up Step #5)

System static losses too high?

Reduce losses by improving ductwork.

Yes

Yes

Yes

Yes

No

No

No

No

No

Leaks in ductwork

Repair leaks.

Yes

Belt slipping

Replace or tighten belt.

(Reference V-Belt Maintenance in the Maintenance section)

Yes

Everything is working properly,

consult factory.

Yes

Too Much Airflow

Blower speed too high?

Adjust drives as needed.

(Reference Blower Start-Up Step #5)

Insufficient external static

pressure?

Increase external static pressure.

Filters not in place?

Install filters.

Yes

Yes

Yes

No

No

Everything is working properly,

consult factory.

No

29

®Model MSX Make-Up Air

Excessive Noise or Vibration

Troubleshooting

Sheaves aligned?

Align sheaves.

(Reference V-Belt Drive Maintenance in the Maintenance section)

Wheel unbalanced?

Clean and/or balance wheel(s).

Belts worn or loose?

Replace worn belts or tighten loose belts.

(Reference V-Belt Drive Maintenance in the Maintenance section)

Yes

Yes

No

No

Yes

Bearings worn or need

lubrication? Replace worn bearings or lubricate bearings as needed.

(Reference Bearing Maintenance in the Maintenance section)

Yes

No

Wheel rubbing on inlet?

Adjust wheel(s) or inlet.

At this time noise and vibration should

be at acceptable levels.

Yes

No

No

30 ®

Model MSX Make-Up Air

Electric Heater Does Not Operate (optional)

Supply fan must be on for heater to operate

Troubleshooting

24 VAC between

terminals W1 and X?

Heat Switch (S4) Off

(Turn Heat Switch (S4) On)

Heat Switch not wired

(Wire Heat Switch (S4))

24 VAC between

terminals 22 and 21?

Main Transformer (TR2) defective

(Replace transformer)

24 VAC between

terminals I and 21?

Pressure Differential Switch (PDS) open

(Check on cause of control loss)

Automatic and/or Manual Reset Cutouts (A and M) tripped

(Reset/Replace Automatic and/or Manual Reset Cutouts (A and M))

(Check on cause of control loss)

24 VAC between

terminals T1 and 21?

Heat Relay (RH) is not energized

(Check for loose connections). (Repair or replace Heat Relay (RH))

24 VAC between

terminal A2 on heat relay (RH)

and X?

(Optional) Inlet Air Sensor (TS4) holding

(Adjust (TS4) setting. Reference Blower Start-Up Step #6)

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

At this time the heater should be energized.

(The heating elements will not be on if the leaving air

temperature is above its set point on the Remote Adjuster (RA))

31

®Model MSX Make-Up Air

Evaporative Cooler does not Operate (Recirculating pump)

Supply fan must be on for cooler to operate

Troubleshooting

Water Blows through Evaporative Cooler

Water supply greater than

evaporation and bleed-off rate?

Use the main supply valve to reduce the supply of water.

Air velocity greater than

specified?

Reduce the air velocity through the media.

(Reference Blower Start-Up Step #5)

At this time the evaporative cooler should be

operating without water blowing through.

Are the headers in place and

located near the entering

air side of the media? Replace headers and/or move the headers.

(Reference Evaporative Cooler Start-Up Step #1)

Yes

No

Yes

Yes

No

No

115 VAC between terminals

102 and 101

24 VAC between terminal A2 on

Cooling Relay (RC) and X

Cooling Transformer (TR4) defective

(Replace transformer)

Optional Inlet Air Sensor (TS4) holding

(Adjust TS4 setting. Reference Blower Start-Up Step #6)

115 VAC between terminal

114 and 101 Cooling Relay (RC) is not energized

(Check for loose connections)

(Repair or replace relay)

24 VAC between terminals

Y1 and X Cool Switch (S4) off

(Turn Cool Switch (S4) on)

Cool Switch not wired

(Wire Cool Switch (S4))

No

No

No

Yes

Yes

Yes

At this time the evaporative cooler pumps should be on

Yes

32 ®

Model MSX Make-Up Air

Water Wizard™ — Improper Water Supply

Troubleshooting

1. Adjust the Manual Supply Valve

Adjust the manual supply valve (refer to Start-Up,

Water Wizard™). If the recommended water pressure

does not provide enough water, increase the pressure

until the desired water supply is achieved. If the

recommended water pressure provides too much

water, decrease the water pressure until the desired

water supply is achieved.

2. Enter Program Mode

Press and hold

the Enter key for

three seconds to enter

Program Mode. The

display will read “Pro”

when Program Mode is

active.

3. Adjust the On Time Factor

While in the Program Menu, use the Up and

Down keys to navigate through the menu

options until “ont” is displayed.

With “ont” displayed, press the Enter key to

access the setting.

With the setting displayed, use the Up and Down keys

to adjust the setting as needed.

Increase the factor to increase the water supply or

decrease the factor to decrease the water supply.

Press the Enter key to

save the new On Time

Factor and return to the

Program Menu.

NOTE

If the water supply is too low, the media will

continuously appear dry.

NOTE

If the water supply is too high, the media will be

saturated and excessive water will be draining from

the sump tank.

NOTE

Some water drainage is desired to keep the media

flushed, but it should be minimized to utilize the

Water Wizard™.

CAUTION

Only proceed to Steps 2 and 3 if Step 1 does not

correct the problem.

Program Display

On Time Factor Display

NOTE

Changing the On Time Factor by (1) will change the

water supply by approximately 3%.

IMPORTANT

The enter key must be pressed to save the new On

Time Factor.

4. Exit Program Mode

After 15 seconds of idle time the controller will

automatically exit Program Mode

33

®Model MSX Make-Up Air

Maintenance - Routine

CAUTION

Lock-out the gas and the electrical power to the

unit before performing any maintenance or service

operations to this unit.

V-Belt Drives

V-belt drives must be checked on a regular basis for

wear, tension, alignment, and dirt accumulation.

Check the tension by measuring the deflection in the

belt as shown below.

Check the alignment by using a straight edge across

both sheaves as shown below.

Snow Accumulation

Clear snow away from roof mounted units. Keep the

snow clear of the intake and access doors.

Motors

Motor maintenance is generally limited to cleaning

and lubrication (where applicable).

Cleaning should be limited to exterior surfaces only.

Removing dust and grease build-up on the motor

assures proper motor cooling.

Motors supplied with grease fittings should be

greased in accordance with the manufacturer’s

recommendations.

Wheels

Wheels require little attention when moving clean air.

Occasionally oil and dust may accumulate on the wheel

causing imbalance. When this occurs the wheel and

housing should be cleaned to assure proper operation.

Belt Tension

Belt Span

Deflection = Belt Span

64

FANMOTOR FAN

MOTOR

Drive Alignment

IMPORTANT

Premature or frequent belt failures can be caused by

improper belt tension, or misaligned sheaves.

• Abnormally high belt tension or drive

misalignment will cause excessive bearing loads

and may result in failure of the fan and/or motor

bearings.

• Abnormally low belt tension will cause squealing

on start-up, excessive belt flutter, slippage, and

overheated sheaves.

IMPORTANT

Do not pry belts on or off the sheave. Loosen belt

tension until belts can be removed by simply lifting

the belts off the sheaves.

IMPORTANT

When replacing V-belts on multiple groove drives,

all belts should be changed to provide uniform drive

loading.

IMPORTANT

Do not install new belts on worn sheaves. If the

sheaves have grooves worn in them, they must be

replaced before new belts are installed.

IMPORTANT

Do not allow water or solvents to enter the motor

or bearings. Motors and bearings should never be

sprayed with steam, water or solvents.

IMPORTANT

Greasing motors is only intended when fittings are

provided. Many motors are permanently lubricated,

requiring no additional lubrication.

34 ®

Model MSX Make-Up Air

Maintenance - Routine

continued

Filters

Filter maintenance is generally limited to cleaning and

replacement.

If aluminum mesh filters are installed, they can be

washed in warm soapy water.

An adhesive spray can be added to aluminum mesh

filters to increase their efficiency.

If disposable filters are installed, they can be checked

by holding up to a light source. If light cannot pass

through the filter, it should be replaced.

IMPORTANT

When reinstalling filters, be sure to install them

with the airflow in the correct direction. An airflow

direction arrow is located on the side of the filters.

IMPORTANT

Replacement filters should be from the same

manufacturer and the same size as the original

filters provided with the unit.

Evaporative Coolers

The media should be periodically brushed lightly with

a soft bristle brush in an up and down motion while

flushing with water. This aids in reducing the amount

of mineral build-up.

For large amounts of mineral build-up, clean or

replace the media and increase the water bleed-off or

flush rate.

The cooling media has a useful life of 3 to 5 years

depending on the water quality and the bleed-off or

flush rate.

Leaving Air

Entering Air

45º

15º

Media Orientation

IMPORTANT

When reinstalling the evaporative media, make sure

that it is installed correctly. Reference the drawing

shown below.

IMPORTANT

Replacement media should be from the same

manufacturer and be the same size as the original

media provided with the unit.

Bearings

The bearings for Greenheck fans are carefully selected

to match the maximum load and operating conditions

of the specific class, arrangement and fan size.

The instructions provided in this manual and those

provided by the bearing manufacturer will minimize

any bearing problems.

IMPORTANT

Lubricate bearings prior to periods of extended

shutdowns or storage and rotate shaft monthly to

aid in corrosion prevention. If the fan is stored more

than three months, purge the bearings with new

grease prior to start-up.

Recommended Bearing Lubrication Schedule (in Months*)

Fan

RPM

Bearing Bore Size (inches)

1⁄2 - 1 11⁄8 - 11⁄215⁄8 - 17⁄8115⁄16 - 23⁄16 27⁄16 - 3

250 6 6 6 6 6

500 6 6 6 5 4

750 6 5 4 3 3

1000 5 3 2 1 1

1250 5 3 2 1 1

1500 5 2 1 1 0.5

2000 5 1 1 0.5 0.25

*Suggested initial greasing interval is based on 12 hour

per day operation and 150°F (66°C) maximum housing

temperature. For continuous (24 hour) operation, decrease

greasing interval by 50%

• If extended grease lines are present, relubricate while in

operation, only without endangering personnel.

• For ball bearings (operating) relubricate until clean grease

is seen purging at the seals. Be sure not to unseat the seal

by over lubricating.

• For ball bearings (idle) add 1-2 shots of grease up to 2

inch bore size, and 4-5 shots above 2 inch bore sizes with

a hand grease gun.

• For roller bearings add 4 shots of grease up to 2 inch bore

size, and 8 shots for 2-5 inch bore size with a hand grease

gun.

• Adjust relubrication frequency based on condition of

purged grease.

• A high quality lithium based grease conforming to NLGI

Grade 2 consistency, such as those listed here:

Mobil 532

Mobilux #2

Texaco Multifak #2

Texaco Premium #2

B Shell Alavania #2

Exxon Unirex #2

35

®Model MSX Make-Up Air

IMPORTANT

Be sure to read and follow the manufacturer’s

recommendations before using any cleaning fluid.

CAUTION

Caution should be used to avoid injury when venting

the coil. High pressure and/or high temperature

fluids can cause serious injuries.

Chilled Water Coils

Test the circulating fluid for sediment, corrosive

products and biological contaminants. Make the

necessary corrective measures.

Maintain adequate fluid velocities and proper filtering

of the fluid.

If automatic air vents are not utilized, periodic venting

of the coil is recommended to remove accumulated air.

Cooling Coils

Inspect the coil for signs of corrosion and/or leaks.

Repair any leaks as required.

Inspect the coil’s surface for foreign material. If the

coil surface needs cleaning, clean the coil from the

leaving air-side so that foreign material will be washed

out of the coil rather than pushed farther in.

Inspect and clean the drain pan to prevent the growth

of algae and other organisms.

Maintenance - Routine

continued

WARNING

Repair and replacement of the coil and the

connecting piping, valves, etc., should be performed

by a qualified individual.

36 ®

Model MSX Make-Up Air

Maintenance - Fall

Evaporative Coolers

The water should be shut off and all the lines drained

when the outside temperature drops below 45

°

F.

Remove drain plugs for the winter.

Clean all interior parts of any mineral deposits or foreign

materials that may have built-up during the cooling

season.

Replace any worn or non-functioning parts.

Winterizing Chilled Water Coils

During the winter, chilled water coils need to be

protected against freezing. Greenheck recommends

protecting the coils by either blowing-out the coils or

by flushing the coils.

Blowing-Out Coils

1. Close valves on the supply and return lines.

2. Open drain valves and/or drain plug. Remove

vent plug to allow coil to drain faster.

3. After coil is fully drained, connect a blower to the

caps. Do not connect the blower to the air vent

or drain plug.

4. Close the vent plug on the header that the blower

is connected to. Open the drain valve or cap on

the other header.

5. Turn on blower for 30 minutes. Place mirror at

discharge. If the mirror fogs up, repeat procedure

until no fog appears on the mirror.

6. After drying the coil, wait a few minutes then

repeat Step #5.

7. Leave drains open and do not install plugs until

beginning of cooling season.

Flushing Coils

Greenheck recommends the use of inhibited glycol

(such as propylene or ethylene) to flush water coils

to protect against freezing. Additionally, the use of

inhibited glycol provides corrosion protection.

The table below indicate the percentage of glycol

required to prevent freezing in a coil at a given outdoor

air freeze point. Completely fill coil with solution. Drain

coil. Residual glycol fluid per these concentrations

can be left in the coil without concern of freezing.

Recovered fluid can be used to flush other coils.

Percent of

Ethylene

Glycol

by Volume

Freeze Point Percent of

Propylene

Glycol

by Volume

Freeze Point

°F ºC °F ºC

0 32 00 32 0

10 25 -4 10 26 -3

20 16 -9 20 19 -7

30 3 -16 30 8 -13

40 -13 -25 40 -7 -22

50 -34 -37 50 -28 -33

60 -55 -48 60 -60 -51

37

®Model MSX Make-Up Air

Reference

Typical Control Center Layout

MSX Unit Control Center Layout

7

8

4

6

911

12

10

5

14

2

13 18

31

16

15 17

Dirty Filter Switch

1. Primary Fuses — provides proper fusing to low

voltage transformer.

2. Low Voltage Transformer — provides low

voltage to controls and optional evaporative

cooling controls.

3. Low Voltage Fuse — provides proper fusing

to controls and optional evaporative cooling

controls.

4. Control Terminal Block — provides wiring

access to controls.

5. Building Freeze Protection Timer (optional)—

prevents the discharge of cold air into the

building.

6. Fan Relay — allows power to pass to energize

motor starter.

7. Supply Motor Starter — 24 volt magnetic

contacts for starting supply motor.

8. Supply Overload — provides electronic

overload protection to supply motor.

9. Auxiliary Contact (optional) — provides one

normally closed and one normally open contact

for other equipment.

10. Exhaust Fuses (optional) — provides proper

fusing for exhaust fan motor(s).

11. Exhaust Motor Starter (optional) — 24 volt

magnetic contacts for starting exhaust motor.

12. Exhaust Overload (optional) — provides

electronic overload protection to exhaust motor.

13. Inlet Air Sensor (optional) — outdoor air stat

that automatically controls the cooling based on

outdoor air temperature.

14. Cooling Relay (optional) — allows power to

pass to cooling controls.

15. Reset Timer (optional) — resets cooling system

to run a time interval.

16. Auto Drain Relay (optional) — assures supply

pump does not operate during drain interval.

Allows pump to operate in cooling mode.

17. Cooling Timer (optional) — allows for

automatic draining of the evaporative cooling

system based on time schedule.

18. Dirty Filter Switch (optional) — monitors filter

pressure drop, turns on indicating light when

pressure drop is above field adjustable set point.

Negative Pressure

after the filters

Common

Normally Open

Normally Closed

CCW to Decrease Trip Point

CW to Increase Trip Point

Positive Pressure

before the filters

38 ®

Model MSX Make-Up Air

Start-Up Checklist

Unit Model Number _______________________________

(e.g. MSX-120-H32-DB)

Unit Serial Number _______________________________

(e.g. 10111000)

Start-Up Date _______________________________

Start-Up Personnel Name __________________________

Start-Up Company _______________________________

Phone Number _______________________________

Pre Start-Up Checklist – check boxes as items

are completed.

oCheck tightness of all factory wiring connections

oVerify control wiring wire gauge

oHand-rotate blower to verify free rotation

oVerify supply voltage to the main disconnect

oVerify the supply gas pressure

oVerify remote controls wiring

Start-Up Blower Checklist – refer to Blower

Start-Up section for further detail.

oCheck line voltage L1-L2 __________

L2-L3 __________

L1-L3 __________

oCheck blower rotation

oCheck for vibration

oSupply fan RPM _________ RPM

oMotor nameplate amps _________ Amps

oActual motor amps _________ Amps

oActual CFM delivered _________ CFM

Optional Accessories – refer to Blower Start-Up

section, Step #6 for further detail.

oHeating Inlet Air Sensor

________ Actual Setting

Typical setting 60º-70ºF (15º-21ºC)

oCooling Inlet Air Sensor

________ Actual Setting

Typical setting 75ºF (24ºC

oBuilding Freeze Protection

________ Actual Setting

Typical setting 5 minutes; 45ºF (7ºC)

oDirty Filter Gauge

________ Actual Setting

Typical setting varies

Start-Up Electric Heater (optional) – refer to

Electric Heater Start-Up section for further detail.

oCheck line voltage L1-L2 __________

L2-L3 __________

L1-L3 __________

oSet the unit’s operating temperature

________ °F

Start-Up Evaporative Cooler (optional) – refer

to Evaporative Cooler Start-Up section for further

detail.

oCheck media orientation

oCheck for proper water flow to distribution

headers

oCheck for distribution header orientation to

prevent water spillage

Start-Up Checklist

39

®Model MSX Make-Up Air

Maintenance Log

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

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Date __________________ Time _____________ AM/PM

Notes:___________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

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_________________________________________________

_________________________________________________

_________________________________________________

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

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_________________________________________________

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

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_________________________________________________

Date __________________ Time _____________ AM/PM

Notes:___________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

40

Greenheck Catalogs MSX provide additional information

describing the equipment, fan performance, available

accessories, and specification data.

®

Phone: (715) 359-6171 • Fax: (715) 355-2399 • E-mail: gfcinfo@greenheck.com • Web site: www.greenheck.com

470658 • Model MSX Make-Up Air, Rev. 3, May 2011 Copyright 2011 © Greenheck Fan Corporation

AMCA Publication 410-96, Safety Practices for Users and

Installers of Industrial and Commercial Fans, provides

additional safety information. This publication can be

obtained from AMCA International, Inc. at: www.amca.org.

Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from

the shipment date. Any units or parts which prove defective during the warranty period will be replaced at our option

when returned to our factory, transportation prepaid. Motors are warranted by the motor manufacturer for a period of

one year. Should motors furnished by Greenheck prove defective during this period, they should be returned to the

nearest authorized motor service station. Greenheck will not be responsible for any removal or installation costs.

As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications

without notice.

Warranty