Fläktgroup Semco ascendant User manual

OWNER’S MANUAL

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Introduction ................................1

The FläktGroup SEMCO System.................1

System Installation ..........................3

Lifting .................................3

Receiving...............................3

Inspection ..............................4

Storage ................................4

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Mounting Details, Curb Support .............9

Mounting Details, Grid or Pad Support .......10

Active Desiccant Wheel ......................11

Fans......................................11

Dampers .................................12

Coils.....................................13

Air Filters.................................13

Unit Control ...............................16

Sequence of Operation ...................16

Programming Parameters.................16

Troubleshooting ............................19

Maintenance ..............................21

The information in this owner’s manual is furnished for informational use only, is subject to change without notice, and should not be

construed as a commitment by SEMCO LLC. SEMCO LLC assumes no responsibility for any errors that may appear in this owner’s manual.

No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic,

mechanical, recording, or otherwise, without the prior written permission of SEMCO LLC.

This manual describes how to erect, store, clean and

maintain a FläktGroup SEMCO Ascendant™ Series

Active Desiccant System.

Each section provides information to guide the

installation and maintenance of all components that

may be included in the system. However, some

individuals may desire more information about one or

more items of equipment installed in the system. If so,

consult the manufacturer’s manual that accompanies

the equipment or is included with our submittal.

It should also be noted that a section or sections

of this manual might not apply to your system; for

example, it may not include a chilled water or steam

coil. The manual has been prepared to cover the basic

system as well common optional components that may

be included in an Ascendant Series Active Desiccant

System.

INTRODUCTION

THE FLÄKTGROUP SEMCO

SYSTEM

TABLE OF CONTENTS

The Ascendant™ Series is a conventional cooling –

active desiccant hybrid system. Performance is

optimized to deliver and control low dew point air while

minimizing energy input. The system is configurable

as a dedicated outdoor air system (DOAS) or a

recirculated air system.

The heart of this system is a technologically advanced

desiccant wheel. This wheel is constructed of inorganic

and incombustible materials in a honeycomb pattern to

lower pressure drop, thereby saving fan energy.

The Ascendant™ system processes outdoor and/

or return air streams to a moderate leaving coil

temperature condition (when needed), thereby

delivering saturated air to the active desiccant wheel

which promotes highly efficient moisture adsorption,

further depressing the supply air humidity content to

very low dew points.

By employing moderate chilled water or refrigerant

temperatures, the efficiency of the cooling system

employed is high.

An integral modulating bypass damper allows the

cool, moderately dry air leaving the cooling coil to be

mixed with the appropriate quantity of warm, very dry

air leaving the dehumidification wheel to deliver the

required supply air dew point. If tight temperature

control is also required, a small sensible only post

cooling coil is employed.

Regeneration of the desiccant wheel is also achieved

with high energy efficiency. A typical regeneration

airflow quantity is only 20% - 40% of the supply airflow

volume. Only moderate regeneration temperatures

(140˚F to a maximum of 200˚F.) are required, allowing

the use of hot water, steam, direct or indirect fired gas,

or electric heat.

For applications where an exhaust air stream

is available (i.e. hospital operating theaters)

preconditioning the outdoor air with FläktGroup SEMCO

total energy recovery is highly recommended since

it substantially increases overall system energy

efficiency and substantially reduces pre-cooling input

requirements. It also provides valuable winter season

preheat and humidification.

On the supply air side of the wheel, a chilled water or

direct expansion coil provides cool, moist air to the

wheel. The wheel adsorbs the moisture, producing

dry supply air. On the regeneration side of the wheel,

warm, dry air enters the wheel, which desorbs the

moisture allowing it to be exhausted from the system.

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FOUR STEPS TO FRESH, COOL AIR DURING THE COOLING SEASON:

LIFTING

FIGURE 1. Lift modules only with lugs located at the base of

each module. Do not use a forklift.

To off load each of the system’s modules, lift only

with the lugs located at the base of each module

(FIGURE 1). Do NOT lift with a forklift. Spreader bars

must be used to hoist sections to avoid damaging

the enclosure (FIGURE 2).

SYSTEM INSTALLATION

How to handle the system upon delivery to the project site.

FIGURE 2. Spreader bars must be used for hoisting modules

to avoid damaging the enclosure.

Bypass Damper

Active

Dehumidiﬁcation

Wheel

Regeneration

HeaterRegen Fan

Cooling Coil

Supply Fan

Regen Out

Regeneration Outdoor Air

Outdoor Air

Dehumidiﬁed Air

Bypass Air

Supply Air

SUPPLY

SIDE

REGENERATION

SIDE

Post Cooling

Coil

(Optional)

SUPPLY SIDE REGENERATION SIDE

STEP 1

Hot, humid outside air is drawn into the

Ascendant system passing through pre-filters

before entering conditioning components.

Hot, humid outside air is drawn into the Ascendant

system passing through pre-filters before entering

conditioning components.

STEP 2 Outside air is cooled and dehumidified before

entering the Active Desiccant wheel.

Outside air is heated to desired temperature to

lower the relative humidity of the air before entering

the Active Desiccant wheel.

STEP 3

The moisture in the air is adsorbed by the

desiccant producing dry air. A modulating damper

allows a portion of the supply air to bypass the

wheel.

The adsorbed moisture is desorbed by heated

air regenerating the wheel’s ability to remove

moisture.

STEP 4

(OPTIONAL) Supply air can be cooled using

post-cooling coils and further filtered with high

efficiency or HEPA filters.

Warm, humidified regeneration air is exhausted

from system.

Chokers need to be adjustable so that the unit is

level when it is picked up and, more importantly,

set down. Setting the unit down on one corner could

cause the unit to rack. Lever chain pullers are useful

for this purpose.

RECEIVING

1) A packing list is supplied with each shipped

system (See FIGURE 3). The list should be

compared with arriving shipments to ensure that

all modules and equipment have been delivered

in good condition. Visible damage should be

noted on the trucker’s bill of lading when

receiving the unit.

2) Prior to leaving the plant, each system has been

tested. You will find the quality assurance label

on the inside of the electric box cover.

3) If the modules are to be stored for more than

three days prior to installation, a visual

inspection of all equipment is necessary. Report

missing or damaged equipment to FläktGroup

SEMCO immediately. Freight claims are difficult

to justify long after delivery has been completed.

(If the modules are to be stored, see STORAGE

on PAGE 4.

4) Modules accumulate dust, dirt and corrosive

matter (like salt) during shipment to the

installation, site on open trailers, and are

FIGURE 3. An envelope with the packing list and other

pertinent information is found inside the electrical box.

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FIGURE 4. All gaskets, bolts, and other items required for

installation are shipped in a box located in the supply air

compartment. On top of the box you will find a packing list.

STORAGE

INSPECTION

In addition to inspecting modules and equipment

visually for possible shipping damage, be sure to

consult “Inspection” instructions described later in this

manual for each optional component.

exposed to still more grime on the construction

site. Therefore, it is imperative that the exterior

of each module be washed down with soap and

water soon after it arrives. Abrasives and solvents

should not be used without first consulting

FläktGroup SEMCO.

4) The interior of each module should also be

cleaned throughly and all equipment should be

lubricated before storing or beginning operation.

5) See other sections for specific lubrication

instructions.

If the system, or parts thereof, must be stored before

installation, indoor storage is preferred. If not possible,

modules should be located on a hard surface with

adequate drainage so that water cannot accumulate

under the modules. A solid paved surface would be

appropriate. Modules must be stored on blocks or

timbers that raise modules at least four inches above

the ground.

If stored indoors, modules should be protected from

damage. If stored outdoors, modules must be covered

with well-anchored canvas tarps. Heavy-mil plastic

tarps should be used with caution as they can trap

moisture against the unit.

MOISTURE MUST NOT BE ALLOWED TO ENTER THE

MODULES. Whether stored indoors or outdoors,

all openings must be closed tightly and piping

penetrations must be capped. However, drain

connections should be left open.

As noted previously, modules must be washed to

remove corrosive materials and dirt before storage.

During the storage period, modules should be opened

and inspected every 30 days. Fans must be inspected

and rotated a few times by hand and stopped in a

position other than the original position. Fans should

also be lubricated as prescribed on the fan label.

INSTALLATION

1) Prepare the installation site by cleaning it of all

debris. Supports, which the modules will be

installed on, should be level. The unit base is

designed either for mounting on a concrete pad or

onto a roof curb (See PAGE 10).

2) Consult drawings and submittal provided to

determine the location of each module. Plan to

lift modules in the order required for your

Installation and within the limitations of your lifting

equipment (see LIFTING on PAGE 3).

3) Adjoining ends of modules are covered with

plywood and/or plastic sheets during transport.

This must be removed prior to hoisting the

modules in place. (See FIGURE 6).If installation

FIGURE 5.

Module sides which are to be joined at time of installation are

covered with plywood and/or plastic sheets for protection

during transport.

Throughout the unit you will find instruction labels indicating

which steps MUST be performed for proper installation.

4) Remove shipping restraints at roof joint (not

shown).

5) Hoist the first module in place. Spreader bars and

hoisting lugs must be used on each module for

hoisting. Do not use forklifts. (See FIGURES 1 and 2

on PAGE 3).

6) After positioning the module correctly, install

continuous gasket material on field joint flange as

indicated in FIGURE 6.

INSTRUCTION

LABEL

REMOVE

BEFORE

INSTALLATION

BUTT STRAP TEK SCREW 12" O.C.

POLYURETHANE CAULK

PANEL

GASKET BETWEEN JOINT

TEK SCREW 12" O.C.

POLYURETHANE CAULK

PANEL

GASKET

FIGURE 6. Detail of field joint located on side.

FIGURE 7. Field joint located on base. Use only these bolts to

pull the modules together!

7) Hoist the second module by its lifting lugs

(continue to use spreader bars), and position it

close to the first module. After aligning with the

first module, move the second module against the

first module.

8) Insert bolts that join the first two modules in the

unit base and tighten. The large bolts in the unit

base may be used to help pull the two modules

against each other. Do not use any of the internal

field joints to pull the units together.

(See FIGURE 7).

9) Verify that the two modules are straight, square

and level. Use metal shims if necessary to level.

10) Hoist and set succeeding modules as described

in STEPS 5-7.

If moisture is found in any module, it must be removed

immediately. The source of the moisture must be

determined and corrected immediately.

During storage, modules should not be stacked on top

of each other.

Boxes containing bolts, gaskets and other items

should be stored inside the modules (See FIGURE 4).

11) If installation requires that some modules be

placed on top of base or bottom modules, be sure

to install continuous gaskets between upper

and lower modules as indicated in drawings and

submittals.

12) Do not torque connecting bolts until all upper

modules are installed. Experience suggests

installing bolts in the following manner. First,

attach bolts that join the centers of connecting

modules. Then work outward from the center

and attach remaining bolts, which will assure

proper alignment. Bolts should only be tightened

by hand until all upper modules are in place.

Then they should be torqued to 25 ft-lbs.

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FIGURE 9. Field joint located at floor.

BUTT STRAP

3/4"-10 NUT

FLAT WASHER

1/2'' THICK BAR STOCK

FIELD

JOINT

C8 x 11.5 CHANNEL

3/4"-10 BOLT

2 1/2" LONG

FLAT WASHER

FIGURE 8. Detailed drawing of field joint.

FIGURE 10

FIGURE 11

FIGURE 12

FIGURE 13

FIGURE 14

FIGURE 15

13) Complete field joint assembly by applying

polyurethane caulk to the exterior of the joint and

then cover with butt strap as shown in FIGURE 6

(on PAGE 5), FIGURE 8 and FIGURE 9.

14) Modules produced for outdoor locations are

manufactured with a galvanized steel standing

seam roof. A section of roof is shipped loose for

field installation at each field job.

Caulk this edge on both sides of

the unit before installing metal

15) Apply polyurethane caulk along the underside

of the roof butt strap and center over the joint

Slide edge of roof panel

under J portion of roof.

between the two modules. Using #12 TEK screws

at approximately 12” centers, screw the butt strap

to the roof.

Caulk, drill and pop rivet to

close/seal end of panel.

Crimp roof lips

after installation

Install butt strap over joint –

caulk and screw in place

(butt strap not shown)

First Foam Panel

16) Apply caulk at high and low point of roof and add

first foam panel.

17) Apply second foam panel. (See FIGURE 14 picture

for caulking instructions).

18) Insert one edge of roof panel as shown and

rotate into place (See FIGURE 13).

Raincap

19) Crimp roof lips with crimping tool (See FIGURE 14).

20) Finish high side of roof with rain cap. Screw in

place similar to factory cap.

21) Holes for conduit, piping, etc., are normally

precut in module panels at the factory. However,

if it is necessary to change the location of a

hole or to cut a new one, these guidelines must

be observed:

• Every hole represents a potential leak. Avoid

adding new holes to the enclosure if possible.

• If it is necessary to add a new hole or to

move the location of a hole already in the unit,

select a location as close as possible to

hookup inside the enclosure.

•Cut holes through panels. DO NOT cut through

structural members.

22) Removable panels are furnished for large items

such as coils. Adequate service space in front of

these panels should be provided in case the item

or items will have to be removed at some future

time (See FIGURE 16 on PAGE 8 ).

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FIGURE 17. Inside the electrical box cover you will find a

wiring schematic, and the quality assurance label.

PAN HEAD SCREW

GASKET

PANEL

REMOVABLE

FIGURE 16. Detailed drawing of removable panel installation.

23) Complete electrical and control connections

across field joints. Use coded wires or terminal

strips in junction boxes and the flex connections

provided. Wiring diagrams are attached to the

inside of the electrical panel (See FIGURE 17).

24) Complete service connections to piping and

power. Be certain to check specific requirements

for electrical power to the energy recovery unit,

fans, dampers and other electrical devices.

25) For components, please reference instructions

in the following sections of this manual before

proceeding.

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MOUNTING DETAILS, CURB SUPPORT

SELF FLASHING UNIT BASE

SHOWING CURB SUPPORT REQUIREMENTS

UNIT LENGTH

CURB

PERIMETER

UNIT PERIMETER

CURB LENGTH = UNIT LENGTH - 6 ½"

SECTION

TYPICAL UNIT WITH CURB SUPPORT

PLAN VIEW

CURB

WIDTH =

UNIT

WIDTH -

6½"

UNIT

WIDTH

3 ¼"

TYPICAL BOTH

ENDS

MINIMUM

SUPPORT AT

FIELD JOINTS

MAXIMUM

SUPPORT ON

UNITS WITH FLOOR

OPNGS.

NOTES

1. ROOF CURB SHOULD BE SIZED TO

ALLOW UNIT TO HANG OVER CURB.

2. CURB SIZE:

WIDTH = UNIT WIDTH - 6.5"

LENGTH = UNIT LENGTH -6.5"

3. UNIT SUPPORT IS REQUIRED

AROUND THE ENTIRE PERIMETER

AND ALONG BOTH SIDES OF ANY

FIELD JOINTS.

4. WHEN UNITS REQUIRE FIELD JOINTS,

SUPPORT SHOULD BE LEVEL TO

1/16" BETWEEN FIELD JOINTS.

3¼"

TYPICAL BOTH

SIDES

2" WIDE SUPPORT AT UNIT

PERIMETER

FIELD JOINT

CENTERLINE

FIELD

JOINT

FLOOR GRATE

FLOOR

OPENING

3 ¼"

CURB (BY OTHERS)

4" WIDE MINIMUM

SUPPORT AT FIELD

JOINTS

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All necessary active desiccant wheel components

have been installed at the factory and tested for

proper operation prior to shipping. Before start up,

the following steps should be taken:

1) Pump grease into the two rotor bearing grease

fittings using a high quality NLGI No. 2 grease

(See FIGURE 18).

ACTIVE DESICCANT WHEEL

FIGURE 21. Fan shipping restraints located at the base of

the fan.

Remove wooden blocks

All necessary system fans and fan motors are installed

at the FläktGroup SEMCO factory. However, before

attempting to operate them, a pre-startup inspection is

recommended.

1) Make sure all power to the fan motors is off.

2) Remove wooden blocks and any shipping

restraints and discard (See FIGURE 21).

FANS

FIGURE 18. Pump

grease into two

rotor bearing

grease points, one

on each side of

the rotor.

FIGURE 20. The

bearing set

screws, one on

each side of the

rotor, should

be checked for

tightness every

six months.

FIGURE 19.

Inspect bearing

collar to ensure

all bolts and

screws are tight.

2) Inspect the rotor visually. It should be well

centered in its casing and should not tilt in any

one direction. If alignment is not suitable, contact

FläktGroup SEMCO.

3) Inspect the bearing bolts and the Allen screws

on the bearing collar to ensure that all are tight

(See FIGURE 19). Tighten any loose screws and

bolts. The bearing bolts should be torqued to 50

ft-lbs. The bearing set screws should be torqued

to 15 ft-lbs.

4) The bearing set screws should be checked

periodically for tightness. A bearing set screw is

located on each side of the rotor (See FIGURE 20).

5) The bearing set screws should be torqued to

15 ft-lbs.

6) Upon unit startup observe the wheel in operation

and verify that the rotor does not bind. If binding

occurs in a new unit, it is usually caused by the

seal or freight damage.

ADJUSTING THE SEALS

Maintaining correct seal adjustment is vital to the

effective operation of the unit. The face and perimeter

seals are designed to gently contact the face of the

wheel and wheel rim angle to prevent air from leaking

across or around the wheel sections. Adjustment of the

seals is simply done by loosening the screws holding the

seal clips in place, adjusting the seal so it just contacts

the surface of the wheel/rim, and then re-tightening the

screws.

3) Inspect the fans:

•Check fan bolts and mountings for tightness.

Tighten loose screws and bolts.

SECTION

UNIT BASE WHEN MOUNTING

ON PAD OR STRUCTURAL GRID

PLAN VIEW

TYPICAL UNIT WITH HOUSEKEEPING PAD

OR STRUCTURAL GRID SUPPORT

UNIT LENGTH

UNIT PERIMETER

UNIT

WIDTH

MINIMUM

SUPPORT AT

FIELD JOINTS

MINIMUM

SUPPORT AT

UNIT PERIMETER

MINIMUM

SUPPORT AT

UNIT PERIMETER

NOTES

1. UNIT SUPPORT IS REQUIRED

AROUND THE ENTIRE

PERIMETER AND ALONG BOTH

SIDES OF ANY FIELD JOINTS.

2. WHEN UNITS REQUIRE FIELD

JOINTS, SUPPORT SHOULD BE

LEVEL TO 1/16" BETWEEN FIELD

JOINTS.

2" WIDE SUPPORT AT

UNIT PERIMETER

FIELD JOINT

CENTERLINE

FIELD

JOINT

CONCRETE PAD

(BY OTHERS)

2"2"

4" WIDE MINIMUM

SUPPORT AT

FIELD JOINTS

STRUCTURAL GRID

(BY OTHERS)

MOUNTING DETAILS, GRID OR PAD SUPPORT

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Heating and/or cooling coils can be ordered with the

energy recovery system. All necessary heating and/

or cooling coils have been installed at the FläktGroup

SEMCO factory. However, before operating them, a brief

pre-startup inspection is recommended.

INSPECTION

• Inspect all pipe connections to verify they are tight

and that no damage has occurred during transit or

on-site installation.

•STEAM COILS – Be sure that the unit is level so the

coils inside the casing slope toward the header.

• HOT WATER COILS – Check the freeze protection

thermostat for proper operation so that it will

function to prevent freeze-ups.

OPERATION

•STEAM COILS – Non-freeze steam coils are

designed to operate steam pressures up to, and

including, 150 psig and temperatures to 350°F.

•During initial operation, make sure that

condensate flows back to the headers. Check for

leaks.

•HOT WATER COILS - are designed to operate at

pressures to 150 psig, and temperatures to

366°F. Check for leaks during initial operation.

• COOLING COILS -are designed to withstand

pressures to 200 psig. During initial operation,

check for leaks (See FIGURE 25).

COILS

FIGURE 25. Cooling coils should be checked for leaks during

operation.

3) The dampers are controlled by electric motors.

Make sure that wiring is complete. Check the

wiring diagram on the motor.

4) Turn on power and observe whether or not the

controls trigger dampers correctly. Be sure that

limit switches close when blades are open and

open when blades are closed.

AIR FILTERS

Air filters for the energy recovery system are boxed,

tagged and shipped loose inside the system for field

installation. This minimizes any risk for filter damage

during transit. The air filters must place installed prior

to startup or the warranty could be voided.

Throughout the operating life of the system, it will be

necessary to replace filters as they accumulate dirt

from the air stream.

The system is equipped with two pressure differential

gauges. As air filters accumulate dirt, the pressure

differential will rise.

The PRE-FILTER CAPACITY AND RESISTANCE TABLE

(FIGURE 26) and FINAL FILTER CAPACITY AND

RESISTANCE TABLE (FIGURE 27) provide data for most

pre-filters and final filters used in FläktGroup SEMCO

systems. For each filter size, the pressure differential

(resistance at capacity) using new, clean air filters in

air streams is shown. The capacities columns define

airflow in cubic feet per minute. For specific airflows,

interpolating and estimating will provide adequate

data.

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FIGURE 22. As an option, the fans can be mounted on seismic

arrest mounts.

•Rotate the impeller by hand; it should turn freely.

If not, check for obstructions and contact

FläktGroup SEMCO (see the BACK COVER for

contact info.).

•Ensure that the fan wheel and fan interior are

clean are free of debris.

•Check fan set screw for tightness; re-tighten if

necessary.

4) After completing inspection checks on motors and

fans, turn power on then off quickly. Power should

be on just long enough to start fan rotation.

5) If fans start rotating in the wrong direction (See

ARROW ON THE BLOWER) turn off power

immediately. To correct rotation, lock out power to

the unit feeder, and switch any two line power

wires. To change rotation of only an inverter driven

wheel and not the fans, switch any two VFD line

power wires.

6) Using an amp probe or amp meter, check the

actual operating current of the motor to make

sure it is not being overloaded or underpowered.

The operating current must not exceed the

nameplate current.

7) Allow the assembly to run for about an hour. During

this time, listen for any unusual sounds. To correct

noise problems, see TROUBLESHOOTING on

PAGE 19.

OPTIONAL FAN MOUNT

DAMPERS

While they have been installed and checked at the

FläktGroup SEMCO factory, a pre-startup inspection

is recommended to be sure that nothing has become

detached or damaged during shipment or on-site

installation.

INSPECTION

1) Check blade rotation clearance. Verify that blades

open and close properly and rotate sufficiently.

If they do not, check for obstructions, broken or

bent blades, or loose linkage. Correct or repair as

necessary (See FIGURE 23).

FIGURE 23. Be sure that damper blades open

and close properly and have sufficient rotation

clearance.

2) Be sure that actuator arms and bars connecting

damper motors to control rods or shafts are tight.

(See FIGURE 24).

FIGURE 24. Damper actuator.

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FIGURE 28. Quantity and size of filters in standard units

WHEN TO REPLACE FILTERS

MODEL SIZE

SIZE 5 SIZE 9 SIZE 13 SIZE 18 SIZE 24

SA FILTER

QTY AND

SIZE

24" x 24" (4) 24" x 24" (4) 24" x 24" (6) 24" x 24" (9) 24" x 24" (12)

— 12" x 24" (4) 12" x 24" (3) 12" x 24" (3) 12" x 24" (4)

EA FILTER

QTY AND

SIZE

24" x 24" (2) 24" x 24" (2) 24" x 24" (3) 24" x 24" (6) 24" x 24" (8)

12" x 24" (2) 12" x 24" (3) 12" x 24" (3) 12" x 24" (2) —

It is recommended that filters be changed when the

pressure differential gauge reaches the final resistance

rating illustrated in FIGURE 26 and FIGURE 27 (on PAGE

14). Experience with the new system may suggest

changing filters at a slightly higher or lower reading.

Depending upon the total volume of air required in

the building, altering the replacement differential may

be necessary. But waiting to change filters when the

pressure differential reaches or approaches a higher-

than-recommended figure would mean using packed

air filters that seriously reduce airflow.

If the system is ordered with final filters, then these will

be located behind the pre-filters.

The procedure for removing the old filters and installing

new ones is the same as described on PAGES 5and 6.

For systems equipped with pre-filter and final filter

banks, it is recommended that pre-filter banks be

changed twice as often as final filters.

For air filter replacement, a rigid, cell-type filter that

matches the specifications shown in the PRE-FILTER

AND FINAL FILTER CAPACITY AND RESISTANCE TABLES

is recommended.

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FIGURE 26. Pre-filter Capacity and Resistance Data

• PRE-FILTER CAPACITY AND RESISTANCE DATA

FILTER

DEPTH

NOMINAL

SIZE

(INCHES)

ACTUAL SIZE

(INCHES) CAPACITIES (CFM) RESISTANCE AT CAPACITY

(INCHES W.G)

WIDTH HEIGHT DEPTH MEDIUM HIGH MEDIUM HIGH FINAL

12x24x4 11.38 23.38 3.88 600 1,200 0.12 0.35 0.90

24x24x4 23.38 23.38 3.88 1,200 2,400 0.12 0.35 0.90

12x24x2 11.38 23.38 1.88 500 1,000 0.08 0.28 0.90

12x24x2 23.38 23.38 1.88 1,000 2,000 0.08 0.28 0.90

12" FINAL FILTER CAPACITY AND RESISTANCE DATA*

FILTER MEDIA

EFFICIENCY

NOMINAL SIZE

(INCHES)

ACTUAL SIZE1

(INCHES) AIRFLOW CAPACITY

(CFM)

RESISTANCE (IN.WG.)

WIDTH HEIGHT INITIAL FINAL2

60-65%

12x24 11.38 23.38 1,000 0.29 1.5

24x24 23.38 23.38 2,000 0.29 1.5

80-85%

12x24 11.38 23.38 1,000 0.50 1.5

24x24 23.38 23.38 2,000 0.50 1.5

90-95%

12x24 11.38 23.38 1,000 0.68 1.5

24x24 23.38 23.38 2,000 0.68 1.5

FIGURE 27. 12” Final Filter Capacity & Resistance Data

*NOTES:

1) Actual depth of the 12" filter is 11.50"

2) Maximum recommended final resistance. System design may require a lower change-out reistance.

Maximum operating temperature limit for the filters is 180ºF in continuous operation and 200ºF in intermittent operation.

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PARAM.

TITLE FUNCTION OPTIONS DEFAULT

SETTING

SEMCO

SETTING COMMENTS

B1-01 Frequency

Reference

Selection 1

0: Operator - Digital preset speed d1-

01 to d1-17.

1: Terminals - Analog input terminal A1

or A2.

2: MEMOBUS communications

3: Option PCB

4: Pulse Input (Terminal RP)

1 1 Selects the frequency

reference input source.

B1-02 Run Command

Selection 1

0: Operator - RUN and STOP keys on

the digital operator.

1: Digital input terminals

2: MEMOBUS communications

3: Option PCB

1 1 Selects the run command

input source.

B1-04 Reverse Operation

Selection

0: Reverse enabled.

1: Reverse disabled.

0 1 Permits or prohibits reverse

operation.

B1-07 Local / Remote

Run

0: Run command must be cycled

1: Continue running

0 1 Drives run if run command

is active in new controller

B1-17 Run Command at

Power Up

0: Run command must be cycled

1: Run command issued

0 1 Drive runs if run command

is active at power up

C1-01 Acceleration Time 0.0 to 6000.0 10 60 Acceleration time

C1-02 Deceleration Time 0.0 to 6000.0 10 60 Deceleration time

C4-01 Torque

Compensation Gain

0.00 to 2.50 1 0 Compensates for added

load by increasing output

voltage.

C6-02 Carrier Frequency

Selection

1 : 2.0 kHz

2 : 5.0 kHz

3 : 8.0 kHz

4 : 10.0 kHz

5 : 12.5 kHz

6 : 15.0 kHz

7 : Swing PWM1 (Audible sound 1)

8 : Swing PWM2 (Audible sound 2)

9 : Swing PWM3 (Audible sound 3)

A : Swing PWM4 (Audible sound 4)

B to E: No setting possible

F : User defined (determined by C6-03

through C6-05)

3 1 Lower carrier frequencies

increase torque and audible

noise.

E1-03 V/f Pattern

Selection

0 to FF F F Allows custom voltage

frequency curve.

E2-01 Motor Rated

Current

10 to 200% of drive rated current kVA

dependent

0.57

(208-230)

0.29 (460)

E2-03 Motor No-Load

Current

0 to [E2-01] kVA

dependent

0.23

(208-230)

.11 (460)

Nameplate amps * 40%

Consult SEMCO

PROGRAMMING PARAMETERS

*FläktGroup SEMCO does not recommend use with motors other than those provided with the unit. Consult Yaskawa for assistance

in programming for use with other motors.

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UNIT CONTROLS

PROGRAMMING PARAMETERS

PROGRAMMING THE WHEEL MOTOR VFD:

NOTE: For most V1000 parameters, the drive must be in a STOP

condition while programming.

1) Press ESC key until left-most part of drive’s display

shows F. DRV LED will also be lit.

2) Press DOWN arrow twice to display PAr then press

ENTER key. (Parameters are now accessible)

3) Using UP/DOWN/RIGHT ARROWS, select

parameters to be read and/or changed starting

with A1-01.

4) If required, use RIGHT ARROW or ENTER key to

scroll to right-most digits of parameter name.

Digits will flash.

5) Press ENTER key to read value.

6) Using UP/DOWN/RIGHT ARROWS, set desired

value then press ENTER key to store value. Drive

will accept value,

if valid, then re-display parameter number (i.e. B1-

01, C1-02, etc.)).

7) Repeat STEPS 3 - 6 to program remaining

parameters per application requirements.

8) When complete, press ESC key until left-most part

of drive’s display shows F. DRV LED will also be lit.

V1000 DRIVE IS NOW READY TO RUN.

SEQUENCE OF OPERATION

Refer to the Unit Submittal for a detailed sequence of

operation, performance, and wiring schematic.

The typical sequence of operation is that upon a call

for dehumidification, the pre-cooling coil is active and

cools the process air to the temperature shown in the

submittal. The dehumidification wheel bypass damper

modulates partially closed to produce the correct

proportion of process air through the wheel and bypass.

The regeneration heat source modulates to maintain the

humidity setpoint. The process and regen fans modulate

to maintain their supply CFM setpoints.

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TROUBLESHOOTING

A failure in the drive can fall into one of two categories,

ALARM or FAULT.

WHEN THE DRIVE DETECTS A FAULT:

• The digital operator displays text that indicates the

specific fault and the ALM indicator LED remains lit

until the fault is reset.

•The fault interrupts drive output and the motor

coasts to a stop.

•It will remain inoperable until that fault has been

reset.

TROUBLESHOOTING THE WHEEL

MOTOR VFD

Burner safeties consist of:

• Low gas pressure switch (located on the entering

side of the dual automatic safety shutoff valve)

• High gas pressure switch (located on the leaving

side of the dual automatic safety shutoff valve)

• Automatic reset airflow switch (located inside the

unit measuring air pressure drop across the burner

profile plate)

•High limit (controller mounted inside the burner

control panel)

• Flame rod - signal can be measured at Honeywell

R7847A Flame Amplifier port provided on the

Honeywell RM7895A Flame Relay. The flame rod

signal is 0 – 5.0 VDC, with 1.25 VDC volts minimum

required. Refer to Honeywell literature for detailed

information.

If the FläktGroup SEMCO controller is calling for heat,

and all safeties are made, then 120VAC power will be

delivered to terminal # 7 on the Honeywell flame relay.

If 120VAC power is not present, then trace the voltage

using the SEMCO electrical schematic. If voltage is

present but the burner does not light:

•Is there air in the gas line?

• Are the gas valves opening?

•Measure the flame amplifier signal

•Is the flamerod clean?

If you have additional questions, please contact

FläktGroup SEMCO Service at (573) 443.3636.

TROUBLESHOOTING THE DIRECT-FIRED

GAS HEATER (ON APPLICABLE UNITS)

The basic troubleshooting strategy is to determine if

the problem resides with the program, controller, input

devices, outputs, wiring, or controlled device.

Check sensor input values using the BACview keypad

to confirm that all inputs are operating correctly and

values are as anticipated.

View setpoints using the BACview setpoint menu.

Compare setpoints to the design performance shown in

the unit submittal.

View outputs using the BACview setpoint menu to view

the output determined by the controller.

Measure the output at the controller, then at controlled

device and compare to the output calculated by the

controller. Are all controller outputs set to automatic?

Are inverters set to AUTO and NOT HAND MODE?

The controller has hand-off-auto capabilities which

can be useful for troubleshooting or for emergency

operation. For automatic operation, all output switches

on the controller should be to the left.

Manuals for the inverters and any gas-fired equipment

are shipped with the unit. Manuals for damper

actuators are available from the manufacturer's web

site. Condensing units for DX coils are provided by

other than FläktGroup SEMCO.

WHEN THE DRIVE DETECTS AN ALARM (MINOR FAULT):

The digital operator displays text that indicates the

specific alarm or minor fault and the ALM indicator LED

flashes.

• The motor does not stop.

• The digital operator displays text that indicates the

specific alarm or minor fault and the ALM indicator

LED flashes.

• Remove the cause of an alarm or minor fault to

automatically reset.

In the event of an alarm or fault consult the Yaskawa

V1000 Technical Manual (page 241), also available

at www.drives.com, or contact FläktGroup SEMCO

Technical Service at (573) 443.3636 for assistance.

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PARAM.

TITLE FUNCTION OPTIONS DEFAULT

SETTING

SEMCO

SETTING COMMENTS

H5-01 Drive Node

Address

0-20H 1F * Serial Communications

address

Set at factory. Consult

SEMCO

H5-09 CE Detection Time 0.0 - 10.0s 2 10 Sets the time required to

detect a communications

error.

L1-01 Motor Overload

Protection

0: Disabled

1: Std. Fan Cooled (speed range < 10:1)

2: Std. Blower Cooled (speed range

10:1)

3: Vector Motor (speed range 100:1)

1 3 Overload function based on

motor type

L2-01 Momentary Power

Loss Operation

Selection

0: Disabled - Drive trips on (Uv1) fault

when power is lost.

1: Power Loss Ride-Thru Time - Drive

restarts if power returns within the

time set in L2-02.

2: CPU Power Active - Drive will restart

if power returns as long as the CPU

is working.

0 1 Allows drive to restart after

power loss without a fault

L3-01 Stall Prevention

Level during

Acceleration

0: Disabled

1: Enabled

2: Intelligent Stall Prevention

1 0 Disables stall prevention

during acceleration

L3-04 Stall Prevention

Level during

Deceleration

0: Disabled

1: General Purpose Stall Prevention

2: Intelligent Stall Prevention

3: Stall Prevention with Braking Option

4: Over excitation Braking

1 0 Disables stall prevention

during deceleration

L3-05 Stall Prevention

Level during Run

0: Disabled

1: Decelerate Using C1-02

2: Decelerate Using C1-04

1 0 Disables stall prevention

during run

L5-01 Number of Auto

Restart Attempts

0 to 10 0 5 Selects number of automatic

restart attempts after fault.

L8-05 Input phase loss

protection

0: Disabled

1: Enabled

1 0 Selects the detection of

input current phase loss,

power supply voltage

imbalance, or main circuit

electrolytic capacitor

deterioration.

L8-07 Output phase loss

protection

0: Disabled

1: Enabled

2: Enabled

0,1 0 Selects the output Phase

loss detection

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MAINTENANCE

COMPONENT SERVICE STARTUP

MONTH

1 3 6 9 12

WHEEL

Rotor bearing lubrication x x x

Bearing bolts tightness x

Bearing set screw tightness x x x x

Motor and gear reducer bolt

tightness

x x x x

Check seals x x x x

Check/clean variable

frequency controller

Drive System X X X

FAN Check/clean shaft and wheel x x x x x

FAN MOTORS

Clean motors x x

Inspect motor connections x x

Check operating current x x

Check motor bolt tightness x x

Lubricate motor bearings x

DAMPERS

Check rotor blade clearance x

Inspect damper for dirt and

foreign matter

xxxx

Inspect dampers seals for

deterioration

xxxx

FILTERS Replace based on pressure

differential

MAINTENANCE SCHEDULE

DAILY MAINTENANCE

It is recommended that the unit be visually inspected daily. Taking a few moments each day to make sure that the

unit is functioning will save many future hours, dollars and headaches. Each day, ensure that:

•The rotor is rotating under power;

• The motor is running;

•All devices are on and operating (the variable frequency controller, temperature controller, and rotation detector).

All other maintenance activity should be conducted monthly, quarterly, semiannually or annually as described in this

manual. All essential maintenance services are summarized in the MAINTENANCE SCHEDULE below.

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PROBLEM POSSIBLE CAUSES SOLUTION

Vibration

Out of balance fan motor.

Check for dirt. If dirty, clean motor. Airfoil blades are usually hollow.

Check inside for moisture. If it is accumulating, drill 3/16” drain hole

on trailing edge to solve accumulation problem.

Loose mounting bolts. Tighten bolts.

Bent fan shaft. Check shaft with dial indicator. If bent, replace shaft immediately.

Fan operating in stall or

unstable flow.

Make sure system is operating at design static pressure and design

flow rates.

Noise -

motors

Supply voltage is high or

inconsistent.

Check supply voltage with voltmeter.

Correct supply voltage if necessary.

Poor air

performance

Incorrect fan rotation. Rotation can be changed on 3-phase motors by reversing any 2

motor leads.

Abrupt turn in duct close to

fan discharge or air prespin

caused by elbows at fan inlet.

Install turning vanes or elbow splitters in duct. If more change is

needed, discharge position may have to be changed.

If fan has inlet volume

control, is it properly

installed?

Inlet volume control must be installed with prespin of the air in

direction of wheel rotation when control is partially closed.

Devices for air modulation

closed or plugged. Open or unplug.

Clogged filters. Replace filters.

Improperly mounted fan

wheel, or off-center wheel.

Center fan between inlet cones to avoid overloading one side and

starving the other side. Correct wheel mounting.

Fan power draw

unexpectedly low.

• Correct air prespin into fan inlet.

• Fan drive sheaves may be set for too low fan speed; correct if

necessary.

• Resistance to air flow is much higher than calculated; check for

closed damper or other duct obstructions; recheck duct layout.

Fan power draw

unexpectedly high.

• Fan speed may be too high. Fan may operate without duct work at

low resistance so too much air flows.

• Fan may be handling ambient air instead of intended hot, less

dense air.

• Fan may be running backward; check and correct if necessary.

Damaged or dirty fan or

system. Clean fan or system, or replace damaged parts.

Motor

problems

Incorrect wiring. Correct.

Fan speed too high. Check fan speed against submittal.

Parts improperly installed or

binding.

See “Inspection” at beginning of this section. Re-check and correct if

necessary.

Bearings improperly

lubricated.

See motor lubrication instruction in the maintenance section.

Do not over-lubricate.

Protection devices may be

improperly sized. Check against submittal.

TROUBLESHOOTING: FANS AND MOTORS

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FIGURE 31. Detail of TE-1567 R0 Idler

VARIABLE FREQUENCY CONTROLLER

1) The variable frequency controller is cooled by

air flowing through the heat sink slots. The

slots must never be allowed to become

obstructed with dirt or foreign material.

Periodically check and clean the heat sink

slots with compressed air or a vacuum.

Airflow must never be restricted in any way.

2) Check and clean the variable frequency

controller annually.

MEDIA CLEANING

Semi-annually, or more frequently if pressure drop

across the wheel increases at a given airflow, clean

wheel media by air blowing at 100 psi while using a

vacuum or other device to collect any dust or debris

that may exit the other side. Extra care should be

taken to ensure that the air nozzle or vacuum/other

device does not touch or damage the rotor surface.

SEALS

Seals should be checked to ensure they remain in

gentle contact with the wheel after the first month of

operation, and every 3 months thereafter.

NOTE: If seals give any sign of binding the rotor, they should

be adjusted immediately.

Adjustment of the seals is simply done by loosening

the screws holding the seal clips in place, adjusting the

seal so it just contacts the surface of the wheel/rim,

and then re-tightening the screws.

holding the bracket to the perimeter, correct the

position, laterally and/or along the perimeter, so the

teeth now mesh, and reattach the bracket using #10 x

¾” tek screws.

CHAIN TENSION DETAIL

If the chain is excessively tight, chain damage and

gear motor failure may result. If the chain is too loose,

the chain may slip off the wheel sprocket(s). A good

rule of thumb for amount of slack is 2 to 4 percent of

the distance between the idler and the point where the

chain connects with the wheel.

The tensioner should be positioned so that after final

tensioning it is approximately at a 45 degree angle as

shown on FIGURE 31. Too little tension will limit the

effectiveness of the tensioner and too much may cause

premature chain failure.

TENSIONER ADJUSTMENT

1) Loosen the tensioner by accessing the

mounting bolt from the back side of the

mounting bracket.

2) Adjust the tensioner base by using a wrench

on the adjusting nut to load the tension spring.

3) Tighten until chain has proper amount of

slack and preload tensioner spring. Utilize

tick marks on the tensioning arm and base

as a guide. After final tensioning the tensioner

should be able to move one full tick mark

when pulled to compress the spring (removing

chain tension).

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MAINTENANCE: SYSTEM

The system enclosure requires very little maintenance

since it is constructed of strong, weather-resistant

materials. Equipment contained within the enclosure

requires regular maintenance to keep the system

operating smoothly. You will find maintenance

instructions for every component in this section.

• Inspect the enclosure periodically:

• Check for air leaks in the casing

•Ensure modules remain level

• Make sure that doors do not bind

•Check around all penetrations and roof joints to be

sure that seals remain tight and do not leak

MAINTENANCE: WHEEL

ROTOR BEARING

The rotor bearing’s anticipated average life is 20 years.

The bearing was greased prior to shipment. However,

lubrication just prior to start-up is recommended.

RECOMMENDED LUBRICATION

The bearing’s lubrication cycle depends upon the range

of temperatures normally experienced by the unit 24

hours a day. For a typical temperature range of -20°F

to 130°F, lubrication every 6 months is adequate. If

higher temperatures (130° to 170°F) are experienced,

lubrication every 3 months is recommended. For

environments with temperatures above 170°F, consult

FläktGroup SEMCO.

Grease should be pumped into the 2 bearing grease

points - one located on each side of the rotor. (See

FIGURE 29) A high grade NLGI No. 2 grease is

recommended. NOTE: If a rotor bearing requires

replacement, contact FläktGroup SEMCO for detailed

instructions.

FIGURE 29. Grease

should be pumped

into two rotor bearing

grease points, one

located on each side

of the rotor. Lubrication

frequency depends

upon operating

temperatures normally

experienced around the

rotor.

FIGURE 30. The

bearing set screws,

one on each side of

the rotor, should be

checked for tightness

every six months.

The bearing bolts normally require checking at start-up

only. The bearing bolts should be torqued to 50 ft-lbs.

BEARING SET SCREWS

1) The bearing set screws should be checked

periodically for tightness. A bearing set screw

is located on each side of the rotor (See FIGURE 30).

RECOMMENDED CHECKING FREQUENCY –

Bearing set screws should be checked at start-

up, one month after start-up, then every 6 months

thereafter.

2) The bearing set screws should be torqued to 15 ft-lbs.

MOTOR

The motor has deep grooved, double-shielded bearings

with sufficient lubricant packed into the bearings by the

manufacturer for “life lubrication.” The initial lubricant

is supplemented by a supply packed into larger

reservoirs in the end shield at the time of assembly. No

grease fittings are provided as the initial lubrication is

adequate for up to 10 years of operation under normal

conditions. No lubrication is required.

WHEEL DRIVE SYSTEM

The chain and sprockets should be checked

periodically for wear and correct chain tension after

start-up and semi-annually thereafter. Although the

Ascendant wheel rotates at low speeds – less than

25 revolutions per hour – unnecessary wear can still

result from misalignment or improper tensioning.

DRIVE SYSTEM ALIGNMENT

At startup, observe the chain as the wheel rotates.

The chain should mesh with the teeth on the wheel

perimeter. If the teeth do not mesh, remove the screws

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Check shafts and fan wheels every three months for

dirt buildup, corrosion and cracks, and other signs of

stress or fatigue. Clean as necessary, and apply new

coatings when appropriate.

NOTE: After applying new coatings and/or applying welds

to the fan, be sure to check the assembly’s balance. The

application of welds and coatings can cause an imbalance.

MAINTENANCE: FANS

MAINTENANCE: FAN MOTORS

• Motors will operate effectively for years if operated

by proper current and kept clean, dry and properly

lubricated.

• Clean motors every six months. Use moderate air

pressure (25-30 psi) to blow away dirt from vent

fins and other accessible areas.

NOTE:Keep areas surrounding the motors clear so

air can circulate freely through the motor to cool it.

•Inspect connections every six months. Watch for

frayed or exposed wiring and loose connections.

Repair or tighten as necessary.

•Check operating current every six months. Make

sure that motors continue to operate at faceplate

current or below.

•Check for vibration and for mounting-bolt tightness

every six months. Tighten any loose mounting bolts.

Make sure that motor runs smoothly without

vibrating.

•Lubricate motor bearings with one or two squirts

of high grade, lithium-based grease annually

(Chevron SRI #2 or similar recommended). Do

not over lubricate! Consult motor manufacturer

for detailed lubrication instructions.

MAINTENANCE: DAMPERS

• Every 3 months, inspect dampers, arms, bars, and

control rods and shafts for dirt and other foreign

matter that would impede normal movement and

prevent blades and seals from seating properly.

Clean as necessary.

• Inspect seals every three months to be sure that

none have pulled loose or deteriorated. If

replacement is required and the seal can be

replaced, remove it and replace with a new

seal of the same shape, design and material used

originally. Do not use a different size or shape. In

some instances, the seal may not be replaceable

and it may be necessary to replace the entire

blade.

•No lubrication required. Damper shafts utilize non-

lubricating bearings.

MAINTENANCE: COILS

Heating and cooling coils function at peak efficiency

when clean and free of foreign matter. Frequent visual

inspections should be made, and any built up dirt and

foreign matter should be removed. A fin comb may be

required to remove matter entangled in fins or coils

(See FIGURE 32), but flushing with water under normal

local pressure will remove most particulates.

FIGURE 32. A fin comb may be used to remove matter

entangled in fins, as well as to straighten fins. But normally,

flushing coils with water under normal pressure will remove

most matter.

•An acid or alkaline coil cleaner is recommended

every 1 or 2 years, depending upon the degree of

oxidation, to thoroughly clean and brighten coils

and fins.

• Local water conditions may make it necessary to

treat chilled water systems, hot water systems and

steam systems to control corrosion, sludge and/or

metal oxides. In some water supplies, scale

removers and inhibitors may also be required.

•Cooling coils – If water in the system will be

exposed to outdoor temperatures that are below

freezing, either drain the system before

temperatures dip below 32°F, or add glycol to the

system to prevent freezing.

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Ascendant Owner’s Manual - FlaktGroup Semco 2021-12

To learn more about FläktGroup

SEMCO offerings and to contact your

nearest representative please visit

www.semcohvac.com

trated and described in this publication. Speciﬁcations are subject to change without further notice. Any FläktGroup SEMCO purchase is subject to FläktGroup SEMCO standard terms and conditions.

Certiﬁed dimensions will be supplied upon request on receipt of order. SEMCO is a registered Trademark of SEMCO LLC. Other trademarks and logos in this publication may be property of SEMCO, LLC,