OEM Maintenance Docs 2.pdf

Fan Belt Adiustment

The Supply Fan belts must be inspected periodically to as-sure proper unil operation-

Beplacernent is necessary il the belts appear frayed or worn Unrts with dual beits requrre a matched set ol bells lo ensure equal belt length. When inslalling new belts. do not stretch lhem over the sheaves; instead. loosen the adjustable mo-tor-mountrng base.

Once lhe new bells are installed, adjust the beJl tension us-ing a Browning or Gates tensron gauge (or equivalent) illus-trated in Figure 16.

1. To determine the appropriate belt deliection:

a. N4easure the center-to-center dislance. in inches, between lhe fan sheave and the motor sheave.

b. Divide the distance measured in Step 1a by 64;the resulling value represents the amounl ol belt delleclion for the proper belt tension.

2. Set the arge O-ring on lhe belt tension gauge at lhe detlection value determined in Step 1b.

3. Sel the small O-ring al zero on the lorce scale of the qauge.

4. Place lhe large end oi the gauge on the beit al the center ol the belt span. Depress the gauge plunger until the large O'ring is even with lhe of the second belt or even with a straightedge placed across lhe sheaves.

5. Remove the tension gauge from the beLt. Notice that the smail O-ring now indicates a value other than zero on lhe

Service & Maintenance force scale. Thrs value represents the iorce (in pounds) requrred to deflect the belt(s) the proper distance when properly adjusted.

6. Compare the lorce scale reading in slep 5 with the appro-pnale "lorce" value in Figure 17. lf the lorce reading rs outslde of the listed range ior the type of belts used, eilher readjust the belt tension or contact a qualilied service rep-resentative.

Figure 16 Typical Belt Tension Gauge

I l l

_l

Note: The aclual belt detlection force must not exceed the maximum value shown in Fi9urc 17

7. Flecheck the new bell's tension at least twice during lhe ,irst 2 to 3 days ol operation. Fleadiust the belt tension as necessary lo correcl for any stretching that may have oc-curred. Unlil lhe new belis are "run in', lhe belt tension will decrease rapldly as they slretch.

See Supply Fan Sheave and Belt Table on the following page.

Supply Fan Sheave and Belt Table

Nominal Tons N,4otor RPI\,4 Fan Sheave (3,4,7 )

Browning SST Fan Bushing (7)

Browning SST Motor Sheave (5,7 )

Browning SST Motor Bushing (6,7) Browning SST

Belt

27.5 & 30 Ton 7.5 hp BK190 X 17t16 8K190-1-7 t16 BK62H

BK57H

BK62H

BK62H

BK57H

BK62H

H 1-3/B H 1-3/B H 1-3l8

H-1-3/8 H-'1-3/8 H-1-3/8

BK160X 1 7t16 8K160-1-7t16 8K 160 X'1 7t16 8K160-1-7t16

BX10B Notched BX I00 Notched 8X103 Notched

27.5 & 30 Ton 10 hp 650 BK 190 X 17t16 BK l90-1-7/16 BK75H

BK67H

BK72H

BK75H

BK67H

BK72H

H 1-3l8 H13/8 H 1-3/B

H 1,3/B H 1 3/B H-1,3t8

(1) 750

8K160 X 1 7t16 8K160-1-7t16 8K160 X 1 7t16 8K160-1-7t16

BXl0B Notched 8X103 Notched 8X103 Notched

35 Ton 7.5 hp 600 BK 160 x 1 7/16 BK'160- 1-7l16 BK57H BK57H H 1.3/B H-1-3/8 BX 100 Nolched 10 hp 650

BK 190 x 1 7 t16 8K190-1-7 t16 BK75H BK75H

BK67H BK67H

H 1-3/8 H 1-3/B

H-1-3/B

H- 1-3/8BK160X1 7/16 8K160-1-7/16

8X108 Notched 8X103 Notched

15 hp (2) 790 BK160X 1 7/16 8K160-1-7/16 800 8K160 X 1 7t16 BK160_1_7t16

185V68 18685DS

1B5V7O l BTOSDS

B15/8 815/8

SDS 1 5/B

SDS 1 5/8

BX 103 Notched 8X103 Notched

40 Ton 10 hp B 1 11t16 B 1 11t16 B'1 11i 16

2B5V 124 2B5V 124 285V124

28124SK

28124SK

28124SK

sK 1 11/'t6 sK 1 11i 16 sK 1 1'1l16

2BK36H

2BK4ON

2BK45H

2BK36H

28K4OH

2BK45H

H 1-3/8 H 1-3/8 H 1-3i 8

H-1-3/8 H-1-3/8 H-1-3/8

BX95 Notched BX95 Notched BX95 Notched

285V124 285V136 2B5V 1 36

28124SK

2B1365K

2B 1 36SK

B 1 11/16 B 1 11t16 B 1 11t16 sK 1 11/16 sK 1 11i16 sK 1 11116

285V42 285V50 2B5V 54

2B42SH

2B5OSDS

2B54SDS

P1 1-5/8 B '1 5/8 815/8 sH 1 5/8

SDS 1 5/8

SDS ,1 5/8

BXg5 Notched BX97 Notched BX97 Notched

50 Ton 10 hp 2B5V 124 285V124

525 28124SK

28124SK

B 1 11t16 B 1 11t16 sK 1 11/16 sK 1 11i 16

2BK4OH 2BK4OH

2BK45F 2BK45H

H 1-3i8 H 1-3/8

H-1-3/B H-1-3/8

BX95 Notched BX95 Notched

15 hp 625

2B5V 124 285V136

28124SK

2B 1 365K

B 1 11i16 B '1 1 1/16 sK 1 1 1/16 sK 1 '1 1/16

285V42 2B42SH

2B5V5O 2B5OSDS

sH 1 5/8

SDS 1 5/8

BX95 Notched BX97 Notched

P'1 '1-5l8

815/8 20 hp 725 2B5V'136 2B 1 36SK B 1 11t16 SK 1 11/16 285V54 2B54SDS B15/B SDS 1 5/B BX97 Notched

I ForYCqasr€lectrr.sonlv 2 l-o,rCandttCoohngonrvinaw hpte.rnrhearua,rso.tv 3 B,owr'ng.8\'60

17.toara SSI BNrbO I 7 tbshedr'e,a,e

"re.ria, qeooe.

d 8tow.'^r 8r'c0x l, 6ano ssr Bt tgo I / tbst"e,""sa,€ ne,,h$uoahre5 Br.wnrngandSsTsheavesw[hrd€nrcarnumbersar.r e(ha.qCableandca.be,redw heachorr,er.sbush]n9s6 Brownr.g lr I3/a and SST H 1 3/3 bushi^gs.r€ i.rer.h!ngeabte a4 (an bo used wtrh each orhe..s sheaves7 Allothersheaves&bushrngsarei.rer.haoge.bteontvi.sheavetbLEh,ngcomb,narons6rs Sersdonormrxvendors

15 hp

Service & Maintenance (Continued)

Figure 17 Belt Detlection

Def1ec'Lion Belt Span ()4

Detlection Force (Lbs.)

Supe r

Gripbelts Gripnotch Steel Cable

Gripbelts

Section Ran Min. Max. Min. Max. Min. Max

Bells Cross Small P.D

3.0 -3.6 3.8-48

5.0 - 7.0

3 4112 37tB 31/2 5 4 1/2 4 51/2 5

5 112 6 114

6 7lB

3114 4 3 314 4 314 4 1t4 5 114

3.4-42

4.4 - 5.6

5.8 - 8.8

4 51i2 53/4 5 1/8 7 118 6 1t2 6 3t8 I 314 7 3/8 a 4112 5112 I 1tA 5 314 7 114 '101/8 7 83/4

A a

Bel t Spal =-__ Def lection Force (Lbs.)

358 Gripnotch BeltsBelt

Cross Small P.D

Gripbe Its

Monthly Maintenance

Before completing the foiowing checks, turn the unit OFF and lock the main power disconnecl switch open.

A*o^*,*o Hazardous Voltage!

Disconnecl all electric power, including remote discon-nects berore servicing. Follow proper lockouutagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

Filters

[] lnspect lhe relurn air filters. Clean or replace them if nec-essary. Heler to the Table below lor filter informatlon.

U nit Model

O uantity Filter DinEnsion (inches)

TC, TE, YC'330 - 420

TC, TE. YC'480 & 600

15Y, X 19/2 X2- 15r, X 19Y, X2'

' Filter dimensions are actual. Nominal lllter size

Section Ra Min. Max. Min. Max

5V

4.4 - 8.7 *--- ---- 10 15

7.1 - 10.9 101121531412718 183/4

'1 1 .8 - 16.0 13 19 1/2 15 22

[] lnspect the F/A-B/A damper hinges and pins to ensure that all moving parts are securely mounted. Keep lhe blades clean as necessary.

JlVerily that all damper linkages move lreely; lubricate wilh white grease, rf necessary.

[ ] Check supply lan molor bearings; repair or replace the motor as necessary.

[] Check the fan shafl beariogs for wear. Beplace the bear-ings as necessary. These bearing are considered perma-nently iubricated for normal operation. For severe dirty ap-plications. if re ubr catron becomes necessary, use a lithrum based grease. See Table 27 lor recommended greases.

Nole: The bearings are manufactured using a special synthetic lithium based grease designed tor long life and minimum relube intervals. Over lubrication can be just as hatmtul as not enough.

UaeeFand grease 9un lo lubricate these bearings; add grease until a lighl bead appears all around the seal Do not over lubricatel

Alter greasing lhe beaangs, check the selscrews lo ensure that the shafl is held securely. Make sure that ail bearing braces are tighl.

[ ] Check the supply lan bell(s). lf the belts are frayed or worn, replace them.

[] Check the condition of lhe gaskel around the conlrol panel doors. These gaskets must fit correctly and be in good condrlion to prevent waler leakage.

[]Verity that all lermrnal connections are tight.

[] Remove any corrosion present on the exlerior suriaces ol the unit and repaint these areas.

is 16x20

Cooling Season il Check the unit's drain pans and condensate piping to en-sure lhat there are no blockages.

[ ] lnspect the evaporator ano condensel corls lor dr'1. bent frns, etc. ll lhe cor.s appear dirty. clean them accordrng to the inslructions described in "Coil Cleanlng" laler in thas section.

l] I\4anually rolate the condenser fans to ensure lree move-" ment and check motor bearings lor wear Verify that all of the fan mounting hardware is tight.

[] Generally inspect lhe unrt lor unusuat condltions (e.q., loose access paneJs, leaking piping connections, etc.)

Make sure thal all retaining screws are reinstalled in the unit access panels once these checks are complete.

With the unrt running, check and record the:

ambienl iemperalure;

compressor oil level (each circuit);

compreSSOr Suction and discharge pressures (each circuit);

superheat and subcooling (each circuit);

Record thrs data on an "operatols maintenance log" like lhe one shown in Table 28. lf operating pressures indicale a re-frigerant Shortage. measure lhe system superheat and sys 1em subcooling. For guidelines, refer to 'Charging by SUb-coolinq".

Note: pg Not release reftioerant to the atmosphere!

It adding or removing relrigercnt is required, the service technician must comply with all federal, state and local laws. Reler to genetal service bulletin MSCU-SB-1 (latest edition).

Heating Season

Before compleling lhe following checks, turn the unit OFF and lock the marn power disconnect switch open_

WAHNING

Hazardous Voltage!

Disconnect all electric power, including remote discon-nects belore servicing. Follow proper lockouutagout procedures to ensure the power can not be inadverten y energized. Failure to disconnect power berore servicing could result in death or serious injury.

I] lnspect the unrl's air filters. ll necessary, clean or replace them.

IlCheck supply fan motor bealngsi repair or replace the motor as necessary.

Jl Check the fan shaft bearings lor wear. Fteplace the bear ings as necessary. These bearing are considered perma-nently lubricaled for normal operation. For severe dirty ap-plications, if relubricalion becomes necessary, use a lithium based grease. See Table 27 lor recommended greases.

Note: The bearings are manutactured using a special synthetic lithium based grease designed lor long life and minimum relube intervals.Too much lubrication in a bearing can be just as harmtul as not enough.

Use a hand grease gun to lubricale the bearings; add grease until a light bead appears all around the seal. Do not over lubflcatel After greasing the bearings, check lhe setscrews to en, sure that the shaft is held securely. lvake sure lhat a beanng braces are tight.

Jl lnspect both the main unit control panel and heat section control box lor loose eleclricai components and terminal connections, as we,l as damaqed wire rnsulation. lvlake any necessary repairs_ llYC' unrts only - Check the heat exchanger(s) ior any cor, rosion, cracks, or holes.

I I Check the combustion atr blower lor dirt. Clean as neces, sary.

l\wnnrurruo Hazardous Gases and Flammable Vapors!

Exposure to hazardous gases rrom luel substances have been shown to cause cancer, birth delects or other reproductive harm. lmproper installation, adiustment, al-teration, service or use o, this product could cause llam-mable mixtures. To avoid hazardous gases and llam-mable vapors follow proper installation and set up o, this product and all warnings as provided in this manual. Failure to tollow all instructions could result in death or serious injury.

When using dry nitrogen cylinders lor pressurizing units ,or leak testing, always provide a pressure regulator on the cylinder to prevent excessively high unit pressures.

Never pressurize unit above the maximum recom-mended unit test pressure as specified in applicable unit literature. Failure to properly regulate pressure could re-sult in a violent explosion, which could result in death or serious injury or equipment or property-only-damage.

I I Open the marn gas valve and apply power to lhe unit heat-ng seclion; then lnlttale a "Heat' lest using the start-up procedure desclbed in "Verilying Proper Heater Opera-t on'.

[]Verily thal the ignition system operates properly.

Service & Maintenance (Continued)

Note: Typically, it is not necessary to clean the gas furnace. HoweveL il cleaning does become necessary, remove the burner plate hom the lront of the heat exchanger to access the drum. Be sure to replace lhe existing gaskets with new ones belore reinstalling the burnet.

Exxon Unirex #2 I\lobi 532 20F1o250F

I/lobil SHC #220 Texaco Premium RB

Coil Cleaning

Regular coii maintenance, incJuding annual cleaning-en hances the unit's operating efficlency by minimizing:

compressor head pressure and amperage draw;

water carryover;

ian brake horsepower: and, static pressure losses.

ReconYrEnded Grease Recorrunended

Operatinq Range fable 27 Grease Recommendations

At least once each year-or more oflen if the unit is located in a "dirty" envtronment-{lean lhe evaporator and con-denser coils uslng lhe instructjons ou ined below. Be sure to follow these instructions as closely as possible to avoid dam-aging lhe coils.

Relrigerant Coils To clean refrigerant coils, use a solt brush and a sprayer (ei-lher a garden pump-up type or a hrgh-pressure sprayer). A h gh-quality detergent is also required; suggested brands in-clude "SPREX A.Cl', 'OAKITE 161", "OAKITE 166" and "COILOX'. lf the deiergent selected is strongly alkaline (pH value exceeds 8.5), add an inhibitor.

1. Remove the access panels on both sides of the untt and the fillers.

4\wanrurruc No Step Surface!

Do not walk on the sheet metal drain pan. Walking on the drain pan could cause the supporting metal to col-lapse. Failure ol the drain pan could result in death or serious injury.

Bridging between the unit's main supports may consist ol multiple 2 by'12 boards or sheet metal grating.

2. Straighlen any bent corl fins with a fin comb.

3. Remove loose dirt and debr s lrom bolh sides oi lhe coll with a soft brush.

4. Mix the detergenl wilh water according to ihe manulacturer's rnstructions- ll desired. heat lhe solutlon to 150" F maximum to rmprove its cleansing capabiiity.

l\wnnrurwc Contains Relrigerant!

System contains oil and relrigerant under high pressure Becover relrigerant to relieve pressure belore opening the system. See unit nameplate lor relrigerant type. Oo not use non-approved refrigerants, refrigerant substi-tutes, or rerrigerant additives.

Failure to tollow proper procedures or the use o, non-approved retrigerants, refrigerant substitutes, or retrig-erant additives could result in death or serious iniury or equipment damage.

Service & Maintenance (Continued)

Note: Retrigercnt oil is dettimental to some rcofing matetials. Care must be taken to protect the rool trofl oil leaks or spills.

5. Pour the cleaning solution inio lhe sprayer. lf a high-pres-sure sprayer is used:

a. The minimum nozzle spray angle is 15 degrees.

b. Do not allow sprayer pressure to exceed 600 psi.

c. Spray the solution perpendicular (at 90 degrees) to the coil face.

d. Maintain a minimum clearance ol 6" between the sprayer nozzle and the coil.

6. Spray the leaving-aidlow side o, the coil first; then spray the opposite side ol the coil. Allow the cleanrng solution to stand on the coil for five minutes.

7 B nse both s des oi the co i w lh coo c ean waler

8. lnspect both sides of the coil; li it still appears to be dirty, repeal Steps 7 and 8.

9. Reinstall all ol the compooents and panels removed in Step 1;then resiore power to the unit.

Table 28 Sample Operator's Maintenance Log (See Note)

Refrigerant Circuit *1 Curreni

Ambient Temp.

Compr oit

Level

Suct.

Pre ss (Psi S)

Disch.

P re ss.

(Psig)

L iquid P ress.

(Psi S)

Super-heal (F)

Sub-cool.

(F)Dale (F)

Betrigerant Circuil #2

Compr.

oit

Leve I

Suct.

Press (PsiS)

Disch.

P ress (PsrS)

Liq uid P ress (Pds)

Super-heal (F)

S ub-cool.

(F)

'ok

- low ok ow ok -ok

-ok -ok

- low ok

OW

-ok

-ok

- low

-ok

- low

-ok ok low

-ok 'ok

'ok 'ow

-ok

- low ok low

-ok

-ok -ok

Note: hec rec o e a request eac monl ngl e coo tng season w ng i

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