EVAPCO ESW Series Manuel

Operation and

Maintenance Instructions

For EVAPCO Clos d Circuit Cool rs and

Evaporativ cond ns rs

for LIFE

Internat iona l Ins titute of

Ammo nia Refrigeration

www.iiar.org

Member of

†Mark own d by th Cooling T chnology Institut

†

for LIFE

Operation and Maintenance Instructions

3 Introduction

3 Safety Precautions

3 Terminology

4 Initial Storage and/or Idle Period Recommendations

5 International Building Code Provision

5 Initial and Seasonal Start-Up C ecklist

6 G n ral

6 Initial and S asonal Start-Up

7 R comm nd d Maint nanc Sch dul

9 S asonal Shut-Down Ch cklist

10 Basic Closed Circuit Cooler/Condenser

Sequence of Operation

11 Fan System

11 Fan Motor B arings

11 Fan Sha Ball B arings

12 Fan B lt Adjustm nt

13 Fan B lt Adjustm nt – Induc d Dra

14 Fan B lt Adjustm nt – Forc d Dra Dra

14 G ar Driv s

14 Air Inl t

14 Coil Inl t

15 Fan Syst m – Capacity Control

15 Fan Motor Cycling

15 S qu nc of Op ration for Fan Motor Cycling

15 Variabl Fr qu ncy Driv s

15 S qu nc of Op rations / Guid lin s for Multi-fan

Units with a VFD during P ak Load

16 Two-Sp d Motors

16 S qu nc of Op ration for Two Fan Units with Two

Sp d Motors during P ak Load

17 Recirculated Water System – Routine Maintenance

17 Suction Strain r in Cold Wat r Basin

18 Cold Wat r Basin

18 Op rating L v l of Wat r in Cold Wat r Basin

19 Wat r Mak Up Valv

19 Pr ssuriz d Wat r Distribution Syst ms

20 Bl d-Oﬀ Valv

20 Pump (Wh n Suppli d)

21 Water Treatment and Water C emistry

21 Bl d or Blowdown

21 Galvaniz d St l – Passivation

22 Wat r Ch mistry Param t rs

22 Control of Biological Contamination

23 Gray Wat r and R claim d Wat r

23 Air Contamination

24 Cold Weat er Operation

24 Unit Layout

24 Fr z Prot ction of R circulating Wat r

26 Fr z Prot ction of Clos d Circuit Cool r Coils

27 Unit Acc ssori s

27 Cold Wat r Basin H at rs

27 R mot Sumps

27 El ctric Wat r L v l Control

27 Vibration Cut Out Switch s

27 Capacity Control M thods for Cold W ath r Op ration

27 Induc d Dra Unit Capacity Control

28 Forc d Dra Unit Capacity Control

28 Ic Manag m nt

28 Induc d Dra Units

28 Forc d Dra Units

29 Troubles ooting

32 Replacement Parts

33 Part Id ntiﬁcation Drawings

33 ATWB/ co-ATWB 3’ Wid Units

34 ATC-E/ATWB/ co-ATWB 4’x4’ & 4’x6’ Wid Units

35 ATC-E/ATWB/ co-ATWB 4’x9’ & 4’x12’ Wid Units

36 ATC-E/ATWB/ co-ATC-A/ co-ATWB 7’ Wid Units

37 ATC-E/ATWB/ co-ATC-A/ co-ATWB 8’ & 8.5’

Wid Units

38 ATC-E/ATWB/ co-ATC-A/ co-ATWB 10’ & 12’

Wid Units

39 co-ATWB-E 8.5’ Wid Units

40 co-ATWB-E 10’ & 12’ Wid Units

41 ESW4 8.5’ Wid Units

42 ESW4 12’ Wid Units

43 co-ATC-H/ co-ATWB-H 8.5’ Wid Units

44 co-ATC-H/ co-ATWB-H 10’ & 12’ Wid Units

45 ESWA 8.5’ Wid Units

46 ESWA 12’ Wid Units

47 LSC-E/LSWE/ co-LSWE 4’ Wid Units

48 LSC-E/LSWE/ co-LSWE 5’ Wid Units

49 LSC-E/LSWE/ co-LSWE 8’ Wid Units

(Singl Sid Fans)

50 LSC-E/LSWE/ co-LSWE 10’ Wid Units

51 LRC/LRWB/ co-LRWB 3’ Wid Units

52 LRC/LRWB/ co-LRWB 5’ Wid Units

53 LRC/LRWB/ co-LRWB 8’ Wid Units

54 PMC-E/ co-PMC 5’ Wid Units

55 PMC-E/ co-PMC 10’ and 12’ Wid Units

56 PHC-S/PHC-L 12’ Wid Singl Sid Air Inl t Units

57 PHC-D 12’ and 14’ Wid Two Sid Air Inl t Units

Table of Contents

Congratulations on th purchas of your EVAPCO vaporativ cooling unit. EVAPCO quipm nt is construct d of th high st quality

mat rials and d sign d to provid y ars of r liabl s rvic wh n prop rly maintain d.

Thoroughly cl an road salt, dirt and d bris from unit imm diat ly a r d liv ry. R sidu l  on product surfac s can caus damag that is

not cov r d by any warranty.

Evaporativ cooling quipm nt is o n r mot ly locat d and p riodic maint nanc ch cks ar o n ov rlook d. It is important to

stablish a r gular maint nanc program and b sur that th program is follow d. This bull tin should b us d as a guid to stablish a

program. A cl an and prop rly s rvic d unit will provid a long s rvic lif and op rat at p ak ﬃci ncy.

This bull tin includ s r comm nd d maint nanc s rvic s for unit start up, unit op ration and unit shutdown and th fr qu ncy of ach.

Pl as not : th r comm ndations of fr qu ncy of s rvic ar minimums. S rvic s should b p rform d mor o n wh n op rating

conditions n c ssitat .

B com familiar with your vaporativ cooling quipm nt. R f r to th isom tric drawings locat d on pag s 31-52 for information on th

arrang m nt of compon nts in your quipm nt.

If you should r quir any additional information about th op ration or maint nanc of this quipm nt, contact your local EVAPCO

r pr s ntativ . You may also visit www. vapco.com or www.mrgoodtow r.com for mor information.

Qualiﬁ d p rsonn l should us prop r car , proc dur s and tools wh n op rating, maintaining or r pairing this quipm nt in ord r to

pr v nt p rsonal injury and/or prop rty damag . Th warnings list d b low ar to b us d as guid lin s only.

T is equipment s ould never be operated wit out fan screens and access doors properly secured and in place.

A lockable disconnect switc s ould be located wit in sig t of t e unit for eac fan motor associated wit t is

equipment. Before performing any type of service or inspection of t e unit make certain t at all power as been

disconnected and locked in t e “OFF” position.

T e top orizontal surface of any unit is not intended to be used as a working platform. No routine service work is

required from t is area.

Building water systems receive potable and non-potable water from eit er a public or private entity for t eir water

supply. T is water supply for t e building water system can contain various waterborne pat ogens, including

Legionella bacteria, w ic can cause or contribute to various illnesses if aspirated, ingested or in aled. Since

evaporative cooling equipment uses t e same building water, t ere is some potential t at t ese pat ogens mig t

propagate in t e equipment. T erefore, careful consideration s ould be undertaken wit respect to equipment

location and t e implementation of eﬀective water management, inspection and cleaning protocols. (See Control of

Biological Contaminants in t ese Operation and Maintenance Instructions.)

Throughout this manual, th t rms “Induc d Dra” and “Forc d Dra” ar us d. B low is a list of EVAPCO Clos d Circuit Cool r and

Cond ns r products oﬀ rings and as sociat d t rminology.

Induced Dra quipm nt includ s th following Evapco Product Mod ls:

<ESW Product Lines

•ESWA - Clos d Circuit Cool r

•ESW4 - Clos d Circuit Cool r

Introduction

Safety Precautions

Terminology

<AT Product Lines

•ATWB - Clos d Circuit Cool r

•ATC-E - Evaporativ Cond ns r

•co-ATWB - Clos d Circuit Cool r

•co-ATWB-E - W t/Dry Clos d Circuit Cool r

•co-ATWB-H - W t/Dry Clos d Circuit Cool r

•co-ATC-A - W t/Dry Evaporativ Cond ns r

•co-ATC-H W t/Dry Evaporativ Cond ns r

<PHC - Parallel Hybrid Evaporative Condenser

Forced Dra quipm nt includ s th following Evapco Product Mod ls:

<LR Product Lines

•LRWB - Clos d Circuit Cool r

•LRC - Evaporativ Cond ns r

•co-LRWB - W t/Dry Clos d Circuit Cool r

<LS Product Lines

•LSWE - Clos d Circuit Cool r

•LSC-E - Evaporativ Cond ns r

•co-LSWE - W t/Dry Clos d Circuit Cool r

<PM Product lines

•PMC-E - Evaporativ Cond ns r

•PMC-Q - Evaporativ Cond ns r

•co-PMC - W t/Dry Evaporativ Cond ns r

If th unit will sit for idl p riods of tim it is r comm nd d that th following b p rform d in addition to all compon nt manufactur rs

r comm nd d maint nanc instructions.

•Th fan/motor/pump b arings and motor b arings n d to b turn d by hand at l ast onc a month. This can b accomplish d

by tagging and locking out th unit’s disconn ct, grasping th fan ass mbly (or r moving th pump motor fan guard), and rotating it

s v ral turns.

•If unit sits long r than a f w w ks, run g ar r duc r (if quipp d) for 5 minut s w kly.

•If unit sits long r than 3 w ks, compl t ly ﬁll g ar r duc r with oil. Drain to normal l v l prior to running.

•If unit sits long r than on month, insulation t st motor windings s mi-annually.

•If fan motor sits idl for at l ast 24 hours whil th spray pumps ar n rgiz d distributing wat r ov r th coil, motor spac h at rs

(if quipp d) should b n rgiz d. Alt rnativ ly, fan motors may b n rgiz d for 10 minut s, twic daily, to driv any moistur

cond nsation out of th motor windings.

•If coil sits long r than on month, nitrog n charg th coil.

•En rgiz fan motors spac h at rs.

Initial Storage and/or Idle Period Recommendations

Th Int rnational Building Cod (IBC) is a compr h nsiv s t of r gulations addr ssing th structural d sign and installation r quir m nts

for building syst ms – including HVAC and industrial r frig ration quipm nt. Th cod provisions r quir that vaporativ cooling

quipm nt and all oth r compon nts p rman ntly install d on a structur must m t th sam s ismic d sign crit ria as th building.

All it ms attach d to Evapco Clos d Circuit Cool rs or Evaporativ Cond ns rs must b ind p nd ntly r vi w d and isolat d to m t

applicabl wind and s ismic loads. This includ s piping, ductwork, conduit, and l ctrical conn ctions. Th s it ms must b ﬂ xibly

attach d to th Evapco unit so as not to transmit additional loads to th quipm nt as a r sult of s ismic or wind forc s.

General

1. V rify that th ov rall installation r ﬂ cts th r quir m nts of th installation guid lin s found in EVAPCO Bull tin 311 –

Equipm nt Layout Manual availabl at www. vapco.com.

2. Fan motor spac h at rs - To pr v nt any moistur buildup in th windings and b arings, spac h at rs ar provid d as

standard on v ry fan motor. Th s should b wir d prior to op ration.

3. For multi-sp d fan motors, v rify that 30 s cond or gr at r tim d lays ar provid d for sp d chang s wh n

switching from high to low sp d. Also ch ck to s if int rlocks ar provid d to pr v nt simultan ously n rgizing high

and low sp d, and conﬁrm both sp ds op rat in th sam dir ction.

4. V rify all saf ty int rlocks work prop rly.

5. For units op rating with a variabl fr qu ncy driv , mak c rtain that minimum sp d r quir m nts hav b n s t.

Ch ck with VFD manufactur r for r comm nd d minimum sp ds. S “Fan Syst m - Capacity Control” s ction for

mor information, and r comm ndations on locking out r sonanc fr qu nci s.

6. V rify that a wat r tr atm nt plan has b n impl m nt d including passivation of galvaniz d st l units. S “Wat r

Tr atm nt” s ction for mor d tails.

7. If th unit is going to sit idl for an xt nd d p riod of tim , follow all manufactur rs’ fan motor and pump instructions

for long t rm storag . Plastic sh ts or tarps should n v r b us d to prot ct a unit during storag . This practic can

trap h at insid th unit, and could pot ntially caus damag to plastic compon nts. S your local EVAPCO

r pr s ntativ for additional information on unit storag .

BEFORE BEGINNING ANY MAINTENANCE, BE CERTAIN THAT THE POWER IS TURNED OFF

AND THE UNIT IS PROPERLY LOCKED AND TAGGED OUT!

Initial and Seasonal Start-Up

1. Cl an and r mov any d bris, such as l av s and dirt from th air inl ts.

2. Flush th cold wat r basin (with th strain r scr ns in plac ) to r mov any s dim nt or dirt.

3. R mov th strain r scr n, cl an and reinstall.

4. Ch ck m chanical ﬂoat valv to s if it op rat s fr ly.

5. Insp ct wat r distribution syst m nozzl s and cl an as r quir d. Ch ck for prop r ori ntation.

(This is not required at initial start-up. The nozzles are clean and set at the factory).

6. Ch ck to nsur dri liminators ar s cur ly in plac and in th prop r ori ntation.

International Building Code Provisions

Initial and Seasonal Start-Up C ecklist

7. Adjust fan b lt t nsion as r quir d. S “Fan B lt Adjustm nt” s ction.

8. Lubricat fan sha b arings prior to s asonal start-up.

9. Turn th fan(s) and pumps by hand to insur it turns fr ly without obstructions.

10. Visually insp ct th fan blad s. Blad cl aranc should b approximat ly 3/8” (1/4” minimum) from tip of blad to th

fan cowl. Th fan blad s should b s cur ly tight n d to th fan hub.

11. If any stagnant wat r r mains in th syst m including “d ad l gs” in th piping, th unit must b disinf ct d prior to th

fans b ing n rgiz d. Pl as r f r to ASHRAE Guid lin 12-2000 and CTI Guid lin WTP-148 for mor information.

12. Manually ﬁll th cold wat r basin up to th ov rﬂow conn ction.

13. For clos d circuit cool rs, ﬁll th h at xchang r coil with th sp ciﬁ d ﬂuid and “burp” air from th syst m b for

pr ssurizing, using v nts on coil inl ts. Do not do this for vaporativ cond ns rs.

NOTE: Closed circuit coolers s ould only be used on sealed, pressurized systems. Continual aeration of t e water in an open

system can cause corrosion inside t e tubes of t e cooler leading to premature failure.

For clos d circuit cool rs with optional controls, s controls O&M for prop r start up proc dur .

Aer t e unit as been energized, c eck t e following:

1. Adjust m chanical ﬂoat valv as r quir d to th prop r wat r l v l.

2. Unit basin should b ﬁll d to th prop r op rating l v l. S “R circulating Wat r Syst m Op rating L v ls” s ction for

mor d tails.

3. V rify fan(s) is rotating in prop r dir ction.

4. Start th spray wat r pump(s) and ch ck for prop r rotation as indicat d by th arrow on th front cov r.

5. M asur voltag and curr nt on all thr pow r l ads of pump and fan motor. Th curr nt should not xc d th

motor nam plat full load amp rating taking th s rvic factor into account.

6. Consult your qualiﬁ d wat r tr atm nt company to ﬁn tun th minimum bl d n c ssary, s “Wat r Tr atm nt and

Wat r Ch mistry” s ction.

7. S fan and pump motor manufactur r maint nanc and long t rm storag instructions for mor d tail d information.

Th motors should b lubricat d and s rvic d in accordanc with manufactur r’s instructions.

8. All n w vaporativ cooling quipm nt and associat d piping should b pr -cl an d and ﬂush d to r mov gr as ,

oil, dirt, d bris and oth r susp nd d solids prior to op ration. Any pr -cl aning ch mistry should b compatibl with

th cooling quipm nt’s mat rials of construction. Alkalin formulations should b avoid d for syst ms which includ

galvaniz d mat rials of construction.

Clos d hydronic syst ms conn ct d to ith r a clos d-circuit cool r or dry cool r should b pr -cl an d and ﬂush d

to r mov d bris, gr as , ﬂash rust, oil, and oth r susp nd d solids prior to op ration. Evapco r comm nds th us of

inhibitor ch mistry or inhibit d glycol to minimiz corrosion and scal during normal op ration. EVAPCO r comm nds

a minimum of 25% inhibit d glycol to minimiz corrosion.

1. G ar R duc r – Ch ck oil l v l with unit stopp d 24 hours a r start-up & monthly

2. G ar R duc r/Piping – Do visual insp ction for oil l aks, Monthly

auditory insp ction for unusual nois s and vibrations

3. G ar R duc r – R plac oil S mi-annually

4. Oil Pump – Do visual insp ction for l aks and Monthly

prop r wiring

5. G ar R duc r/Coupling – Ch ck alignm nt of 24 hours a r start-up & monthly

th syst m

6. Coupling/Sha – Insp ct ﬂ x l m nts and hardwar Monthly

for tightn ss, prop r torqu & crack/d t rioration

7. H at r Controll r – Insp ct controll r and Quart rly

cl an prob nds

8. H at r – Insp ct junction box for loos wiring and moistur On month a r start-up and s mi-annually

PROCEDURE FREQUENCY

1. Cl an pan strain r Monthly or as n d d

2. Cl an and ﬂush pan** Quart rly or as n d d

3. Ch ck bl d-oﬀ valv to mak sur it is op rativ Monthly

4. Ch ck op rating l v l in pan and adjust ﬂoat valv Monthly

if n c ssary

5. Ch ck wat r distribution syst m and spray patt rn Monthly

6. Ch ck dri liminators Quart rly

7. Ch ck th fan blad s for cracks, missing balancing w ights Quart rly

loos w ight port caps and op n drain hol s

(Sup r Low Sound Fans) and vibrations

8. Ch ck sh av s, bushings, fan shas and fan hubs Annually

for

corrosion. Scrap and coat with ZRC

9. Insp ct lubrication lin s to b arings Quart rly

10. Lubricat fan sha b arings* Ev ry 1000 hours of op ration (or v ry thr months)

11. Ch ck b lt t nsion and adjust Monthly

12. Sliding motor bas – Insp ct and gr as Annually or as n d d

13. Ch ck fan scr ns, inl t louv rs and fans. Monthly or as n d d

R mov any dirt or d bris

14. Insp ct and cl an prot ctiv ﬁnish Annually

- Galvaniz d: scrap and coat with ZRC

- Stainl ss: cl an and polish with a stainl ss st l cl an r.

15. Ch ck wat r quality for biological contamination. R gularly

Cl an unit as n d d and contact a wat r tr atm nt

company for r comm nd d wat r tr atm nt program**

OPTIONAL ACCESSORIES:

* S maint nanc manual for start-up instructions and lubrication r comm ndations.

** Cooling Tow rs must b cl an d on a r gular basis to pr v nt th growth of bact ria including L gion lla Pn umophila.

Recommended Minimum Maintenance Sc edule

9. H at r – Insp ct l m nts for scal build-up Quart rly

10. El ctronic Wat r L v l Controll r – Insp ct junction box S mi-annually

for loos wiring and moistur

11. El ctronic Wat r L v l Controll r – Cl an prob nds Quart rly or as n d d

of scal build-up

12. El ctronic Wat r L v l Controll r – Cl an insid Annually

th standpip

13. Sol noid Mak -up Valv – Insp ct and cl an valv and As n d d

strain r of d bris

14. Vibration Switch (m chanical) – Insp ct nclosur for On month a r start-up and monthly

loos wiring and moistur

15. Vibration Switch – Adjust th s nsitivity During start-up and annually

16. Sump Sw p r Piping – Insp ct and cl an piping S mi-annually

of d bris

17. Wat r L v l Indicator – Insp ct and cl an Annually

18. SUN Solar Pan ls – Insp ct for damag and cl an with S mi-annually

hos and so brush

Idle Period Recommended Action Frequency

Two or Mor Days En rgiz motor spac h at rs

-or run motors for 10 minut s Twic daily

F w W ks Run g ar r duc r for 5 minut s W kly

S v ral W ks Compl t ly ﬁll g ar r duc r with oil. Onc

Drain to normal l v l prior to running.

On Month or Long r Rotat motor sha/fan 10 turns Bi-w kly

M gg r t st motor windings S mi-annually

Recommended Maintenance Sc edule (continu d)

OPTIONAL ACCESSORIES:

DURING IDLE PERIODS:

Seasonal S ut-Down C ecklist

Wh n th syst m is to b shut down for an xt nd d p riod of tim , th following s rvic s should b p rform d.

1. Th vaporativ cooling unit cold wat r basin should b drain d

2. Th cold wat r basin should b ﬂush d and cl an d with th suction strain r scr ns in plac .

3. Th suction strain r scr ns should b cl an d and r -install d.

4. Th cold wat r basin drain should b l  op n.

5. Th fan sha b arings and motor bas adjusting scr ws should b lubricat d. This should also b p rform d if th unit

is going to sit idl prior to initial start-up.

6. Th mak -up wat r supply, ov rﬂow and drain lin s, as w ll as th r circulating pump and pump piping up to th

ov rﬂow l v l must b h at trac d and insulat d to account for any r sidual wat r.

7. Th ﬁnish of th unit should b insp ct d. Cl an and r ﬁnish as r quir d.

8. Th fan, motor and pump b arings n d to b turn d at l ast onc a month by hand. This can b accomplish d by

making sur th unit’s disconn ct is tagg d and lock d out, and grasping th fan ass mbly, rotating it s v ral turns.

9. En rgiz fan motor spac h at rs.

10. Clos d Circuit Cool rs only - If th r comm nd d minimum ﬂuid ﬂows through th h at transf r coil cannot b

maintain d, and an anti-fr z solution is not in th coil, th coil must b drain d imm diat ly wh n v r th syst m

pumps ar shut down or ﬂow stops during fr zing conditions. This is accomplish d by having automatic drain valv s

and air v nts in th piping to and from th cool r. Car must b tak n to nsur that th piping is ad quat ly insulat d

and siz d to allow th wat r to ﬂow quickly from th coil. This m thod of prot ction should b us d only in m rg ncy

situations and is n ith r a practical nor r comm nd d m thod of fr z prot ction. Coils should not b drain d for an

xt nd d p riod of tim , as int rnal corrosion may occur. S Cold W ath r Op ration s ction of this docum nt for

mor d tails.

See fan and pump manufacturer maintenance and long term storage instructions for more detailed instructions.

System Oﬀ / No Load

Th syst m pumps and fans ar oﬀ. If th basin is full of wat r a minimum basin wat r t mp ratur of 40ºF must b maintain d to pr v nt

fr zing. This can b accomplish d with th us of optional basin h at rs. S th “Cold W ath r Op ration” s ction of this bull tin for

mor d tails on cold w ath r op ration and maint nanc .

System/Condensing Temperature Rises

Th r circulation pump turns on. Th unit will provid approximat ly 10% cooling capacity with only th pump running. If th unit has

positiv closur damp rs th y should b fully op n d b for th pumps turn on.

If th syst m t mp ratur continu s to ris , th unit fan is cycl d on. For a variabl sp d controll r, th fans ar turn d on to minimum

sp d. S th “Fan Syst m – Capacity Control” s ction of this bull tin for mor d tails on fan sp d control options. If th syst m

t mp ratur continu s to ris , th n th fan sp d is incr as d as r quir d, up to full sp d.

Not : During sub-fr zing w ath r th minimum r comm nd d sp d for variabl sp d controll rs is 50%. ALL FANS IN OPERATING

CELLS OF MULTIPLE CELL UNITS MUST BE CONTROLLED TOGETHER TO PREVENT ICING ON THE FANS.

System/Condensing Temperature Stabilizes

Control th l aving ﬂuid t mp ratur (clos d circuit cool rs) or cond nsing t mp ratur ( vaporativ cond ns rs) by modulating th fan

sp ds with variabl sp d driv s or by cycling fans on and oﬀ with singl or two-sp d driv s.

System/Condensing Temperature Drops

D cr as th fan sp d, as r quir d.

System Oﬀ / No Load

Th syst m pump turns oﬀ. Th start r int rlock will n rgiz any optional basin h at rs in cold w ath r.

Th r circulation pump should not b us d as a m ans of capacity control, and should not b cycl d fr qu ntly. Exc ssiv cycling can

l ad to scal build-up, and r duc w t and dry p rformanc .

Dry Operation

During cold r wint r months it is possibl to turn oﬀ th spray pump, drain th cold wat r basin, and just cycl th fans. B sur to l av

th basin drain op n during this tim to pr v nt coll ction of rain wat r, snow, tc. If th unit has positiv closur damp rs th y should b

fully op n d b for th fans turn on. If dry op ration will b us d on a c ntrifugal fan, forc d dra unit, b sur to v rify that th motor

and driv s hav b n prop rly siz d to handl th r duction in static pr ssur xp ri nc d wh n th spray wat r is turn d oﬀ.

NOTE: Minimum control point for process ﬂuid s ould never be lower t an 42º F.

NOTE: W en a unit is provided wit a disc arge damper assembly, t e control sequence s ould cycle t e dampers open

and closed once a day regardless of capacity requirments to prevent t e assembly from seizing. T e fan motor s ould be

s ut oﬀ w enever t e dampers are closed.

NOTE: ESW4/A or PHC product lines s ould not operate dry.

NOTE: T e eco-ATW/eco-ATWE sequence of operation is unique and is explained in detail in t e Sage2, Sage3Panel

Control Manual.

Basic Closed Circuit Cooler/Condenser Sequence of Operation

for Wet or Evaporative Mode

Autres manuels pour ESW Series

Ce manuel convient aux modèles suivants

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