Greenheck Fan Fan MSCF BI User Manual

Part #462888

Modular Small Cabinet Fan

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.

Model MSCF-BI

Model MSCF-FC

General Safety Information

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.

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 the maximum

cataloged fan rpm. Adjustments to fan speed

signiﬁcantly affects motor load. If the fan RPM is

changed, the motor current should be checked

to make sure it is not exceeding the motor

nameplate amps.

5. Do not allow the power cable to kink or come

in contact with oil, grease, hot surfaces,

or chemicals. Replace cord immediately if

damaged.

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.

6. Verify that the power source is compatible with

the equipment.

DANGER

7. Never open blower access doors while the fan is

running.

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.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Table of Contents

Installation

Unit Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Mounting / Hanging Instructions . . . . . . . . . . . . . 4

Mounting Dimensions. . . . . . . . . . . . . . . . . . . . . . 5

Dimensions / Weights. . . . . . . . . . . . . . . . . . . . . . 6

Filter Sizes / Quantity . . . . . . . . . . . . . . . . . . . . . . 6

Coil Dimensions . . . . . . . . . . . . . . . . . . . . . . . . .7-9

Start-Up

Electric Heater. . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Operation

Electric Heater. . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Maintenance

Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Coil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Drain Pan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Reference

Start-Up Documentation. . . . . . . . . . . . . . . . . . . 17

Maintenance Log . . . . . . . . . . . . . . . . . . . . . .18-19

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

System Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . 10

Troubleshooting

Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Motor Overamps . . . . . . . . . . . . . . . . . . . . . . . . . 10

Insufficient / Too Much Airflow. . . . . . . . . . . . . . 10

Excessive Noise or Vibration . . . . . . . . . . . . . . . 10

Start-Up

Coil Module . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13

Drain Pan / Drain Trap . . . . . . . . . . . . . . . . . . . . 13

Unit Layout

Airflow

1. Fan and Cabinet Section

6. Mixing Box Section

7. Lifting Lugs

2. Cooling Section

• Chilled Water

• DX Coils

Four (4) lifting lugs for each section

8. Side Access Panels

3. Heating Section

• Hot Water

Right and left access to each section

(image shows panels removed)

• Steam Coils

9. 7/8-inch knockout is provided for the

recommended electrical wiring penetration or

disconnect switch.

4. Filter Section

Filter may be mounted in Mixing Box Section

5. Plenum Section

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Mounting Instructions

Hanging Instructions

Greenheck’s Modular Small Cabinet Fan (MSCF)

should be lifted by the factory supplied lifting lugs

(see Figure 1) or frame rails and a spreader bar

(see Figure 2) to prevent damage from occurring to

the equipment. Avoid twisting or uneven lifting of

equipment. Do not lift equipment by coil connections

or headers. The unit must remain upright during lifting.

All access doors and panels must be closed during

lifting to avoid damage.

The MSCF should be hung by the factory supplied

lifting lugs or ﬁeld supplied frame rails as shown

respectively in Figures 3 and 4. The number of

hanging brackets used will be determined by the

number of fan modules.

Spreader Bar

Figure 3

Lifting lugs

Figure 1

Figure 4

Spreader Bar

External Mounting Isolation

The MSCF is available with external neoprene or

spring isolation options. When external isolation is

selected, a bridge bracket will be provided to reduce

installation time (see Figure 5).

3/8-16x3/4 Spinlock Bolt

Two required per assembly

3/4 inch Flat Washer

One per assembly as needed

3/8-16 Spinlock Nut

Two required per assembly

Bridge Bracket

Part No. 711779

Drawing No. 89814

One required per assembly

Frame Rails

(by others)

Hanging Bracket

Part No. 710774

Drawing No. 85537

Hanging Bracket

Part No. 710774

Figure 2

Drawing No. 85537

3/8-16x3/4 Spinlock Bolt

Two required per assembly

HANGING ASSEMBLY

Bridge Bracket

Part No. 711779

Drawing No. 89814

One required per assembly

3.0 inch

3/4 inch Flat Washer

One required per assembly

Figure 5

3/8-16 Spinlock Nut

Two required per assembly

BASE ASSEMBLY

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Modular Construction

The MSCF is designed to be modular so it can be

mounted as an assembly or as individual sections

when the appropriate lifting equipment is not

available.

MSCF Mounting Dimensions

Mixing

Box

24 in.

Plenum

12 in.

Plenum

Filter

*Heating

Cooling / Combo

Coil

Fan

Horizontal Hanging

Unit

Size

w/o

Hot Water 4 Row HW

Vertical Sloped

Filter Filter

1 & 2 Row & Steam

6.75

18.5 18.5 6.75

6.75

18.5

6.75

9.5

18.5

2.5

18.5 6.75

*See CAPS for electric heating dimensions.

All dimensions are in inches.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Dimensional Data

Mixing

Box

Plenum

Filter

*Heating

Cooling / Combo

Coil

Fan

Inlet

Outlet

Unit

Size

Unit

Width

w/o

Hot Water 4 Row HW

1 & 2 Row & Steam

12 in. 24 in. Vertical Sloped

Height Width Height Width

Filter Filter

11 24.5 12.75 24.5 12.75 24.5

14 24.5 12.75 24.5 12.75 24.5

12.75

15.5

24.5 25

24.5 29

6.5

6.75

8.5

27 12.75 24.5 12.75

18.5 31 12.75 24.5 12.75

18.5 32 12.75 24.5 12.75

24.5 32 18.5 38

24.5 32 18.5 50

16.5

32 12.75 24.5 12.75

38 12.75 24.5 12.75

24.5 38

24.5 42

48 10.25 10

12 12.75

*See CAPS for electric heating dimensions.

All dimensions are in inches.

Weights

**D

**E

F (FC)

F (BI)

Unit

Size

w/o

Hot Water 4 Row HW

1 & 2 Row & Steam

Max

Motor

Max

Motor

12 in. 24 in. Vertical Sloped

CW/DX Fan

Total Fan

Total

Filter Filter

107

126

145

171

190

209

234

269

323

350

144

161

190

225

269

353

453

500

101

112

123

138

159

190

196

111

130

150

194

253

328

360

105 140

118 157

132 176

151 202

197 263

226 302

168

182

239

279

333

375

228

257

339

379

433

475

100

115

150

175

100

108

141

170

113

136

140

100

125

140

All weights are approximated. Motor weights may very depending on enclosure type and horsepower.

**Weight information for hot water, steam, chilled water and DX coils is wet weight.

*See CAPS for electric heat dimensions.

Filter Sizes and Quantity

Unit

Size

Face

Area

Face

Area

Vertical

Quantity

Sloped

Quantity

12x12

12x24

16x16

16x20

12x24

24x24

12x24

24x24

9x18

1.8

2.5

12x12

12x24

14x18

16x16

16x20

16x24

18x24

24x24

12x24

24x24

2.5

3.0

3.4

3.8

5.3

4.8

5.4

7.2

14.4

8.9

17.8

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Coil Dimensions

Hot Water • 1 and 2 Row

Unit

Size

Face

Area

1.6

2.2

2.7

3.2

4.5

5.2

6.7

8.6

12.75

11.0

14.0

16.0

18.5

21.0

26.0

3.0

4.5

4.0

0.75

0.88

1.13

1.38

Outlet

Inlet

All dimensions are in inches.

NOTE

Fluid enters the coil from the bottom connection

(Inlet) and exits from the top (Outlet).

Hot Water • 4 Row

Unit Face

Size Area

1.6

2.2

2.7

3.2

4.5

5.2

6.7

8.6

38 15.50 9.38 3.188 0.750 4.0 11.0

38 15.50 9.38 3.188 0.750 4.5 14.0

38 15.50 9.38 3.188 0.875 4.0 16.0

38 15.50 9.38 3.188 0.875 4.0 18.8

50 15.50 9.38 3.188 1.375 4.0 21.0

50 15.50 9.38 3.188 1.375 4.0 26.0

62 12.75 9.38 3.188 1.375 4.0 26.0

Outlet

All dimensions are in inches.

Inlet

NOTE

With airflow from left to right, the fluid enters the coil

from the bottom connection (Inlet) and exits from the

top (Outlet). The other two coil connections should

be capped off (Cap).

Steam • 1 and 2 Row

Unit Face

Size Area

1.6

2.2

2.7

3.2

4.5

5.2

6.7

8.6

38 15.50 7.75 3.31 1.5 5.18 11.0

38 15.50 7.75 3.00 1.5 6.50 14.0

38 15.50 7.75 3.31 2.5 7.69 16.0

38 15.50 7.75 3.00 2.5 9.00 18.5

50 15.50 7.75 3.00 2.5 9.00 18.5

50 15.50 7.75 4.31 2.5 10.18 21.0

50 15.50 7.75 3.00 2.5 12.50 26.0

62 15.50 7.75 3.00 2.5 12.50 26.0

Inlet

All dimensions are in inches.

Outlet

NOTE

Steam enters the coil from the center connection

(Inlet) and exits from the bottom (Outlet).

Electric Heat • See our Computer Aided Product Selection (CAPS) Software Program for dimensional data.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Coil Dimensions - continued

Chilled Water • 4, 6 or 8 Row

NOTE

With airflow from left to right, the fluid enters the coil

from the bottom connection (Inlet) and exits from the

top (Outlet). The other two coil connections should

be capped off (cap).

Airflow

Unit Face

Size Area

4 Row 6 Row 8 Row 4 & 6 Row 6 Row

(cap)

3.88

1.6

2.2

2.7

3.2

4.5

5.2

6.7

8.6

38 24.5 11.0

38 24.5 14.0

38 24.5 16.0

38 24.5 18.5

50 24.5 18.5

50 24.5 21.0

50 24.5 26.0

62 24.5 26.0

0.75

0.88

1.38

1.63

Outlet

(cap)

.75

1.5

Inlet

3.75

6.5

13.25

18.5

All dimensions are in inches.

Direct Expansion (DX) • 4, 6 or 8 Row

(Oriﬁce Code 18/19)

Coil connection made inside housing.

Two inch hole is provided.

NOTE

With airflow from left to right, the fluid enters the coil

from the center connection (Inlet) and exits from the

bottom (Outlet). The other coil connections should

be capped off (cap).

Airflow

Unit Face

Size Area

4 & 6

Row

(cap)

4 Row 6 Row 8 Row All

All

8 Row

3.88

1.6

2.2

2.7

3.2

4.5

5.2

6.7

8.6

38 24.5 11.0 8.75 10.75 12.75 5.25 0.63 0.63 1.38

38 24.5 14.0 8.75 10.75 12.75 7.00 0.63 0.63 1.38

38 24.5 16.0 8.75 10.75 12.75 8.00 0.88 1.38 1.38

38 24.5 18.5 8.75 10.75 12.75 9.00 0.88 1.38 1.38

50 24.5 18.5 8.75 10.75 12.75 9.00 0.88 1.38 1.38

50 24.5 21.0 8.75 10.75 12.75 10.25 0.88 1.38 1.63

50 24.5 26.0 8.75 10.75 12.75 13.00 1.13 1.38 1.63

62 24.5 26.0 8.75 10.75 12.75 13.00 1.13 1.38 1.63

Inlet

Outlet

3.75

1.5

6.5

13.25

18.5

All dimensions are in inches.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Coil Dimensions - continued

Direct Expansion (DXI) • 4, 6 or 8 Row

Dual Circuit with 50/50 Face Interlaced Construction

Coil connection made inside housing.

Two inch hole is provided.

NOTE

The first suction header on the entering air side

of the coil is circuited to the top distributor. With

airflow from left to right, the fluid enters the coil

from the center connection (Inlet) and exits from the

bottom (Outlet). The other connections should be

capped off (cap).

Airflow

(cap) (cap)

Inlet 1

Unit Face

Size Area

6 & 8

Row

4 Row

4 Row 6 Row 8 Row

Inlet 2

Outlet 2

3.75

3.2

4.5

5.2

6.7

8.6

38 24.5 18.5 9.25 11.0 7.88 8.50

50 24.5 18.5 9.25 11.0 7.88 8.50

8.5

7.00 12.0

7.00 12.5

Outlet 1

50 24.5 21.0 9.25 11.0 7.50 8.50 8.75 7.75 13.5

50 24.5 26.0 9.25 11.0 8.12 8.75 8.75 9.50 17.0

62 24.5 26.0 9.25 11.0 8.12 8.75 8.75 9.50 17.0

6.5

1.5

13.25

18.5

All dimensions are in inches.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

any two supply power connections will reverse the

direction of rotation.

System Start-Up

For proper unit function and safety, follow everything

in this start-up procedure in the order presented.

This is to be done after the electrical connections are

complete.

To reverse the rotation, turn the power off and use the

following procedure:

•

For single phase units, rewire the motor per the

instructions on the motor.

PRE-START CHECK LIST

1. Disconnect and lock-out all power switches to fan.

•

For three phase units, interchange any two

power leads. This can be done at the motor

starter.

2. Check all fasteners, set screws and locking

collars on the fan, bearings, drive, motor base and

accessories for tightness.

3. Check for Vibration

Check for unusual noise, vibration or overheating of

bearings. Excessive vibration may be experienced

during initial start-up. Left unchecked, excessive

vibration can cause a multitude of problems, including

structural and/or component failure. Many conditions

can be discovered by careful observation. If the

problem is wheel unbalance, in-place balancing can

be done providing there is access to the fan wheel.

Generally, fan vibration and noise is transmitted

to other parts of the building by the ductwork. To

eliminate this undesirable effect, Greenheck has

used a heavy canvas connection between the scroll

and the discharge of the fan. If noise is an issue, we

recommend using heavy canvas connections on the

inlet of the fan. Refer to the Troubleshooting section of

this manual if a problem develops.

3. Rotate the fan wheel by hand and assure no parts

are rubbing.

4. Check the V-belt drive for proper alignment and

tension.

Unit Size

25 - 50

1/4 inch

3/8 inch

65 - 85

Wheel Overlap Dimensions

SPECIAL TOOLS REQUIRED

4. Air Volume Check and Measurement

Along with the building balance, the unit’s air volume

(cfm) should be measured and compared with its

rated air volume. This unit is ﬂexible for varying air

volume, but the actual air volume should be known for

making ﬁnal adjustments. The most accurate way to

measure the air volume is by using the pitot traverse

method in the ductwork away from the blower. Other

methods can be used, but should be proven and

accurate. To adjust the air volume, change the fan rpm

or the system losses. See Troubleshooting section in

this guide.

• Voltage Meter

• Tachometer

• Amperage Meter

1. Check Voltage

Before starting the unit, compare the supplied voltage

with the unit’s nameplate voltage and the motor

voltage. Units are not provided with thermal overload

protection unless a control center has been ordered

with the unit or the motor has been selected with

thermal overload protection.

2. Check Blower Rotation

5. Measure Motor Voltage, Amperage

A common problem is wheel rotation in the wrong

direction. For centrifugal fans, incorrect wheel rotation

will provide poor air performance, motor overloading

and possible burnout. Rotation should be checked

while the fan is coasting to a stop. Proper wheel

rotation is shown.

and Fan RPM

All access doors must be installed. Measure and

record the input voltage and motor amperage(s).

To measure the fan RPM, the blower door will need to

be removed. Minimize measurement time because the

motor may over amp with the door removed.

Compare measured amps to the motor nameplate

full load amps and correct if over amping. See the

Troubleshooting section in this guide.

Backward

Inclined

Forward

Curved

Proper Wheel Rotation

When connecting a 3-phase motor, there is a 50%

chance that the fan will run backwards. Changing

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Troubleshooting

NOTE

Before taking any corrective action, ensure unit is incapable of operation during repairs.

Symptom

Possible Cause

Corrective Action

Blown fuse or open circuit breaker

Broken fan belt

Replace fuse or reset circuit breaker and check amps

Replace

Blower fails to

operate

Defective motor or capacitor

Motor starter overloaded

Airflow too high

Replace

Reset starter and check amps

Check airflow and adjust drives if needed

Static pressures are higher or lower

than design

If higher, ductwork should be improved

If lower, fan RPMs should be lower

Blower rotation is incorrect

Motor voltage incorrect

Check rotation and correct

Motor overamps

Check motor nameplate and supplied voltage

See specifications and catalog for fan curves to determine

if horsepower is sufficient

Motor horsepower too low

Shorted windings in motor

Replace motor

Mixing box damper not fully open

Adjust damper linkage or replace damper motor

Improve ductwork to eliminate losses using good duct

practices

System static pressure too high

Blower speed too low

Mixing box dampers closed

Dirty or clogged filters

Leaks in ductwork

Check for correct drives and RPMs with catalog data

Open and adjust

Clean or replace

Repair

Insufficient airflow

Elbows, or other obstructions may

restrict fan outlet

Correct or improve ductwork

Belt slippage

Adjust belt tension

Correct as shown in System Start-Up section, Step #2,

page 10

Unit running backwards

Excessive dirt buildup on wheels

Blower fan speed too high

Filter(s) not in place

Clean wheel

Check for correct fan RPM

Install filters

Too much airflow

Insufficient static pressure

(airflow resistance)

Induce static pressure into system ductwork

Center wheel

Wheel improperly aligned and rubbing on

housing

Loose wheel on shaft

Loose motor or blower sheave

Belts too loose

Tighten wheel setscrew

Tighten sheave setscrew

Adjust belt tension after 24 hours of operation

Loosen to maintain 3/8 inch deflection per ft. of span

between sheaves

Belts too tight

Worn belt

Replace

Excessive noise or

vibration

Motor base or blower loose

Worn bearings

Tighten mountings bolts

Replace

Bearing and drive alignment

Motor out of balance

Realign

Replace

Unbalanced wheel caused by excessive

dirt and grease buildup

Replace or rebalance

Sheaves eccentric or out-of-balance

Accumulation of material on wheel

Foreign objects in wheel or housing

Replace or rebalance

Clean wheel and housing

Remove objects. Check for damage or unbalance.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

3. When connecting suction and liquid connections,

make sure the coil is free from all foreign material.

Make sure all joints are tight and free of leakage.

Start-Up of Coil Module

Hot Water and Chilled Water

4. Greenheck does not supply compressor or

condensing units, for further instruction on DX coil

installation and operation contact your compressor

and/or condenser manufacturer.

1. Piping should be in accordance with accepted

industry standards. Pipework should be supported

independently of the coils. Water pipes are copper

with sweat connections. USE WET TOWEL TO

AVOID BURNING COIL CONNECTION GROMMETS.

When installing coupling, do not apply undue

stress to the connection extending through the

unit. Use a back-up pipe wrench to avoid breaking

the weld between coil connection and header.

DXI coils have dual connections and should be used

with two compressors.

WARNING

Standard unit insulation of 1.5 lbs. density has an

insulation R-value of 3.7.

2. Connect the water supply to the bottom

connection on the air-leaving side and the water

return to the top connection on the air-entering

side. The extra bottom connection can be used for

an auxiliary manual drain connection, and the extra

top connection may be used for an automatic air

vent, or the extra connections can be capped. To

ensure proper venting, an external air vent in the

piping is recommended. Connecting the supply

and/or return in any other manner will result in very

poor performance. CAP UNUSED CONNECTIONS.

For applications where the unit discharge

temperatures are below 55°F and the unit is installed

in a warm, humid environment, additional insulation

may need to be applied to the exterior of the unit to

prevent condensation.

Steam Coils

Application Recommendations

Satisfactory operation and

service life are best

ensured when coils

are installed with

proper piping,

trap and support

arrangement.

3. The air vent at the uppermost point should be

temporarily opened during system start-up to

release all of the air from the coil. To maintain heat

transfer capacity, periodically vent any air in coil.

Vent to be located behind connections side access

door.

The following

4. Water coils are not normally recommended for

use with entering air temperatures below 40°F.

No control system can be depended on to be

100% safe against freeze-up with water coils.

Glycol solutions or brines are the only safe media

for operation of water coils with low entering air

conditions.

notes and

drawing are

recommended

for the coil unit

installation and

operation.

General

Strainer

WARNING

1. Provide

Float & Thermostat Trap

Gate Valve

separate

supports and

hangers for the

unit and the piping.

Check Valve

Control Valve

Vacuum Breaker

Continuous water circulation through the coil at all

times is highly recommended.

Modulating Two-Position

Steam Coil Piping

5. Pipe sizes for the system must be selected on the

basis of the head (pressure) available from the

circulation pump. Piping should be in accordance

with accepted industry standards.

2. Be certain that adequate piping flexibility is

provided. Stresses resulting from expansion of

closely coupled piping and coil arrangement can

cause serious damage.

6. For chilled water coils, the condensate drain

pipe should be sized adequately to ensure the

condensate drains properly. See Drain Pan Traps

section and related drawing.

3. Standard steam coils are pitched in the casings

when installed for horizontal airflow. The casing

must be level after the unit is installed for proper

condensate drainage. If condensate is not

removed, the coil will suffer from water hammering

and will have a shortened life. On vertical airflow

applications, the coils must be pitched when

installed.

Direct Expansion (DX) Coils

1. Piping should be in accordance with accepted

industry standards. Pipework should be supported

independently of the coils. Undue stress should not

be applied at the connection to coil headers.

4. Do not reduce pipe size at the coil return

connection. Carry return connection size through

the dirt pocket, making the reduction at the branch

leading to the trap.

2. The condensate drain pipe should be sized

adequately to ensure the condensate drains

properly. See Drain Pan Traps and related drawing.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

General - continued

Drain Pan / Drain Trap

5. It is recommended that vacuum breakers be

installed on all applications to prevent retaining

condensate in the coil. Generally, the vacuum

breaker is to be connected between the coil inlet

and the return main. The vacuum breaker should

be open to the atmosphere and the trap design

should allow venting of large quantities of air.

Drain lines and traps should be run full size from the

drain pan connection. Drain pans should have drain

lines and traps to permit the condensate from the

coils to drain freely. On all units with drain pans, the

trap depth and the distance between the trap outlet

and the drain pan outlet should be twice the static

pressure (P) in the drain pan section under normal

operation to assure the trap remains sealed.

6. Do not attempt to lift condensate when using

modulating or on-off control.

7. Do not reduce the pipe size leaving the coil.

Traps

1. Size traps in accordance with the manufacturer’s

recommendations. Be certain that the required

pressure differential will always be available. DO

NOT UNDERSIZE.

2P = minimum

2. Float and thermostatic or bucket traps are

recommended for low pressure steam. On high

pressure systems, bucket traps are normally

recommended. The thermostatic traps should be

used only for air venting.

Drain Pan / Drain Trap

3. Bucket traps are recommended for use with on-off

control only.

4. Locate traps at least 12 inches below the coil

return connection.

Controls

1. On high pressure installations, a two-position

steam valve with a face and bypass arrangement is

preferred where modulating control is required.

2. Modulating valves must be sized properly. DO NOT

UNDERSIZE.

Freezing Conditions (entering air below 35°F)

1. 5 PSI steam must be supplied to the coil at all times.

2. Modulating valves are not recommended. Control

should be by means of face and bypass dampers.

3. Provision should always be made to thoroughly

mix fresh air and return air before it enters the

coil on return air units. Also, temperature control

elements must be properly located to obtain true

air mixture temperatures.

4. As additional protection against freeze-up, the trap

should be installed sufficiently—far below the coil

to provide an adequate hydrostatic head to ensure

removal of condensate during an interruption in the

steam pressure. Estimate 3 feet for each 1 PSI of

trap differential required.

5. On start-up, admit steam to coil ten minutes before

admitting outdoor air.

6. Provision must be made to close fresh air dampers

if steam supply pressure falls below minimum

specified.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Sizing of Supply Conductors

Installation of Electric Heater

(optional)

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).

WARNING

Electrical Shock Hazard! Disconnect all power

sources before doing any work on the unit.

General:

Supply Wire Size

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.

(Not more than six conductors in Single Conduit¹)

Max. Heater

AWG or

MCM

AWG or

MCM

Line Current²

Copper³

0000

250

300

350

400

500

600

700

750

800

900

1000

184

204

228

Electrical Wiring Instructions:

248

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. 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.

268

304

336

368

104

120

140

160

380

392

000

416

436

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

heater line currents to 87½% of those shown above.

Calculation of Line Currents (amps):

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

ambient temperature see National Electric Code table

310-16 and 310-18 Note 13.

watts

Single Phase Current =

volts

Based on 80% of ratings in the National Electric Code

table 310-16 for 75°C insulation.

EXAMPLE: 5 kW, 208 volt

5000 watts

= 24 amps

208 volts

Effect of Low Voltage on Wattage and

British Thermal Unit (BTU)

watts

Three Phase Current =

volts x 1.73

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.

EXAMPLE: 14.4 kW, 208 volt

14400 watts

208 volts x 1.73

14400

360

= 40 amps

De-rated Wattage for Low Voltage

% of

Heater Line

Heater Heater Line

Heater

Voltage Voltage Wattage Voltage Voltage Wattage

and BTU

460

440

265

254

230

220

208

200

190

115

110

480

277

208

120

240

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Sequence of Operation - Electric

Heater

1. Electric heaters are divided in to equally sized

steps. For example, a 60 kW heater with 3 steps

will have 20 kW per step. The thermostat and

step controller will control these steps.

2. 120 Volt power from the control center (when

supplied) or by others with out a control center,

is delivered to the electric heater for the step

controller. This power must be interlocked with

the supply fan, so when the fan is off, the heater

control power is off.

3. A step control with the thermostat set to

70ºF the heater will be off with a temperature

sensing above 70ºF. As the temperature varies

the steps turn on and off to hold the setpoint

discharge temperature. The colder the discharge

temperature becomes the more steps the

controller will energize.

4. With a step controller, in addition to the fan

interlock mentioned in Step 2, the heater has an

airﬂow switch to prove that airﬂow is established

before energizing the steps. The heater also

has an automatic resetting highlimit switch and

manual resetting highlimit switch set above the

automatic switch to protect from overheating.

5. For more detailed information on your speciﬁc

controller, please review the controller spec

sheet supplied with the heater.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Every Three (3) Months

Fan Maintenance

Filters - The ﬁlter in the unit should be inspected

at least every three (3) months. Depending on the

environment, ﬁlters could require changing or cleaning

more or less often. The ﬁlters can be slid out of the

coil connection side of the unit.

Greenheck recommends these procedures to ensure

trouble-free operation of this unit. It is especially

important to maintain heater units for clean and

efﬁcient operation. Most unit failures can be attributed

to poor setup or poor maintenance.

If washable ﬁlters are installed, they can be washed in

warm soapy water. An adhesive spray can be applied

to increase ﬁlter efﬁciency.

A record of maintenance performed on this unit

should be kept. This information will provide essential

information if problems are encountered. A section at

the back of this manual is provided for recording the

unit’s maintenance history.

If disposable ﬁlters are installed, check by holding up

to a light source. If light cannot pass through the ﬁlter,

it should be replaced. Replacement ﬁlters should be

of the same manufacturer and size. When reinstalling

ﬁlters, be sure to install with the airﬂow in the correct

direction indicated on the ﬁlter.

CAUTION

When performing any maintenance on this unit,

be certain the power is disconnected and cannot

be accidentally turned on. The control center

disconnect can be locked in the off position.

Yearly

Bearings — Most bearings are permanently

lubricated and require no further lubrication under

normal use. Normal use being considered -20ºF to

120ºF and in a relatively clean environment. Some

bearings are re-lubricatable and will need to be re-

greased depending on fan use. Check your bearings

for grease ﬁttings to ﬁnd out what type of bearing

you have. If your fan is not being operated under

normal use, bearings should be checked monthly for

lubrication.

Two Weeks after Start-Up

Belts - Belts tend to stretch after a period of

time. They should be

periodically checked

for wear and tightness.

Approximately 3/8 inch

of deﬂection per ft.

Belt Span

Deﬂection =

Belt Span

of span between

Motors — Motor maintenance is generally limited to

cleaning and lubrication (where applicable). Cleaning

should be limited to the exterior surfaces only.

Removing dust and grease buildup on motor housing

assures proper motor cooling. Greasing of motors

is intended only when grease ﬁttings are provided.

Many fractional motors are permanently lubricated

and require no further lubrication. Motors supplied

with grease ﬁttings should be greased in accordance

with manufacturer’s recommendations. When motor

temperature does not exceed 104ºF (40ºC), the grease

should be replaced after 2000 hours of running time

as a general rule.

sheaves is standard for

belt tightness. When

replacing belts, use the

same type as supplied

with the unit. Matched

belts should always be

NOTE: For motors of 1 hp or less a

smaller sliding base bracket

is used to attach to blower.

used on units with multi-groove pulleys.

If adjustments are made, it is very important to check

the pulleys for proper alignment. Misaligned pulleys

lead to excessive belt wear, vibration, noise and

power loss.

CORRECT

WRONG

Wheels — Wheels require very 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 smooth and safe operation. Inspect fan

impeller and housing for fatigue, corrosion or wear.

Belt Alignment

Routinely check all fasteners, set screws and locking

collars on the fan, bearing, drive, motor base and

accessories for tightness.

Replacement of belts can be accomplished by

loosening the motor to the point where the belts

can be removed by hand. Do not force belts on or

off as this may cause breakage of cords leading to

premature belt failure. Belts should be adjusted as

above.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Coil Maintenance

Start-Up Documentation

Coils must be clean to obtain maximum performance.

Check once a year under normal operating conditions

and, if dirty, brush or vacuum clean. Soiled ﬁns reduce

the capacity of the coil, demand more energy from the

fan, and create an environment for odor and bacteria

to grow and spread through the conditioned zone.

High pressure water (400 psi or less) may be used to

clean coils with ﬁn thickness over 0.006 inches thick.

Test the spray pressure over a small corner of the

coil to determine if the ﬁns will withstand the spray

pressure.

Job Information

Job Name

_________________________________

Address

_________________________________

City ________________ State ______ Zip ___________

Phone Number _________________________________

Contact Person _________________________________

Start-Up Company Information

Service Oranization _______________________________

Address

City ________________ State ______ Zip ___________

Phone Number

Fax Number

For coils with fragile ﬁns or high ﬁn density, foaming

chemical sprays and washes are available. Many coil

cleaners contain harsh chemicals, so they must be

used with caution by qualiﬁed personnel only. Care

must be taken not to damage the coils, including ﬁns,

while cleaning.

_______________________________

Start-Up Date

Start-Up Personnel Name__________________________

CAUTION

Fin edges are sharp.

Nameplate Information

Unit Model Number _______________________________

Volts ________________Hertz ________ Phase _______

Amps _______________Mark _______________________

Fan rpm_____________

Winterizing Coils

Coil freeze-up can be caused by such things as air

stratiﬁcation and failure of outdoor air dampers and/

or preheat coils. Routine draining of water cooling

coils for winter shutdown cannot be depended upon

as insurance against freeze-up. Severe coil damage

may result. It is recommended that all coils be drained

as thoroughly as possible and then treated in the

following manner.

Unit Serial Number _______________________________

Field Start-Up Documentation

o Check blower rotation

o Check air volume (cfm)

_________ Design

Fill each coil independently with an antifreeze solution

using a small circulating pump and again thoroughly

drain. Check freezing point of antifreeze before

proceeding to next coil. Due to a small amount of

water always remaining in each coil, there will be

diluting effect. The small amount of antifreeze solution

remaining in the coil must always be concentrated

enough to prevent freeze-up.

_________ Actual

o Actual motor voltage

o Actual motor hertz

o Actual motor phase

o Actual motor amps

_________ Volts

_________ Hertz

_________ Phase

_________ Amps

NOTE: Carefully read instructions for mixing antifreeze

solution used. Some products will have a higher

freezing point in their natural state than when mixed

with water.

Drive

o Fan RPM Range

_________ Minimum

_________ Maximum

Drain Pan Maintenance

Drain pans in any air conditioning unit will have

some moisture in them, therefore, algae and other

organisms will grow due to airborne spores and

bacteria. Periodic cleaning is necessary to prevent

this buildup from plugging the drain and causing the

drain pan to overﬂow. Inspect twice a year to avoid

the possibility of overﬂow. Also, drain pans should be

kept clean to prevent the spread of disease. Cleaning

should be performed by qualiﬁed personnel.

Model MSCF Modular Small Cabinet Fan

Download from Www.Somanuals.com. All Manuals Search And Download.

Maintenance Log