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Bryant 551a - page 1
Cancels : II 551A-1 55-2 II 551 A-155-3 3/1/ 01 CONTENTS Page SAFETY CONSIDERA TIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1 INST ALLA TION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17 I. Step 1 — Pr o vide Unit Support . . . . . . . . . . . . . . . . . 1 II. Step 2 — Rig a nd Place Unit . . . . . . . . . ...
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Bryant 551a - page 2
— 2 — Fig. 1 — Roof Curb Details PKG. NO. REF . CURB HEIGHT DESCRIPTION CRRFCURB010A00 1 ′ -2 ″ (305) Standa rd Cur b 14 ″ High CRRFCURB011A00 2 ′ -0 ″ (610) Standa rd Cur b f or Units Requir ing High Installation CRRFCURB012A00 2 ′ -0 ″ (610) Side Supply and Retur n Curb for High Installation CRRFCURB013A00 2 ′ -0 ″ (610) H ...
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Bryant 551a - page 3
— 3 — NO TE: F or preassembled horizontal adapter roof curb par t no. CRRFCURB013A00, the access ory kit includes a factory-designed, high-static, regain transition duct. F or hor izont al curb par t no. CRRFCURB012A00, a field-supplied transition duct is required. Fig. 2 — Horizo ntal Suppl y Roof Curb and Horizo ntal Adapter Roof Curb NO TE ...
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Bryant 551a - page 4
— 4 — UNIT 551A STD U NIT WEIGHT ECONOMI$ ER WEIGHT CORNER A CORNER B CORN ER C CORNER D DIM A DIM B DIM C Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg ft-in. mm ft-i n. mm ft-in. mm 155 1575 714 80 36.3 407 185 375 170 383 174 410 186 3-5 1039 3-5 1054 1-10 559 180 1650 748 80 36.3 375 170 375 170 449 204 452 205 3-2 963 3-7 1092 1-10 559 Fig. 4 — Ba ...
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Bryant 551a - page 5
— 5 — UNIT 551A STD UNIT WEIGHT ECONOMI$ ER WEIG HT CORNER A CORNER B CORNER C CORNER D DIM A DIM B DIM C Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg ft-in. mm ft-in. mm ft-in. mm 240 1750 794 80 36.3 420 191 395 179 448 203 486 221 3- 3 988 3-5 1054 1 -8 508 Fig. 5 — Ba se Unit Dim ensions, 55 1A240 NO TES: 1. Refer to print for roof curb accessor y ...
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Bryant 551a - page 6
— 6 — T able 1 — P hysic al Data LEGEN D *Evaporator co il fin mate rial/c ondenser coil fin ma terial . †Weight of 14-in . roof curb . **Circui t 1 uses the l ow er po r tion of con denser coil and lower por tion o f ev a pora- tor coils, an d Circuit 2 uses the u pper por ti on of bo th coils. ††Due to b elt and pu lley style, pulley ...
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Bryant 551a - page 7
— 7 — III. STEP 3 — F IELD F ABRICA TE DUCTW ORK Secur e all duct s to b uildi ng stru cture. Use fl exible duct c on- nector s between unit and ducts as required. Insulate and weatherp roof all e xternal ductw ork, join ts, and roof openings with co unte r flash ing and m asti c i n acc ord an ce wi t h appl ica- ble c odes. Ducts pa ssi ng ...
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Bryant 551a - page 8
— 8 — VI. STEP 6 — MAKE ELECTRICAL CONNECTIONS A. Field P ow er Suppl y Unit is factory wi red for voltage s hown on name plate. When i nstalli ng un its , provide a disconn e ct, pe r NEC (Nation al Elec trical Code) req uireme nts , of ad equate si ze (T ab le 2). Elect ric al hea ter da ta is shown i n T ab le 3. All fi eld wiri ng must c ...
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Bryant 551a - page 9
— 9 — T able 2 — Electrical Data (See Legend on page 10.) UNIT 551A NOMINAL VO LT AG E (3 Ph, 60 Hz) V O LTA G E RANGE COMPRESSOR OFM IFM PO WER EXHA UST ELECTRIC HEA T* PO WER SUPPL Y No. 1 No . 2 Min M ax RLA LRA RL A LRA Qty Hp FL A (ea) Hp FLA FLA LRA kW FLA MCA MOCP† 155 (Stand ard IFM) 208/2 30 187 2 53 20 .7 1 56 19. 3 123 3 0.5 1.7 ...
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Bryant 551a - page 10
— 10 — LEGE ND *Heater capacity (kW) is based on h eater volt age of 208 v , 240 v , and 480 v . Heaters are rated at 240 v , or 480 v . If pow er distribution v olt- age to unit v ar ies from rated heater voltage , heater kW will v ar y accordingly . † Fuse or HACR circuit breaker . **Heaters are field installed only . NO TES: 1. I n complia ...
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Bryant 551a - page 11
— 11 — C. Optiona l Non-Fused Disc onnect On units with the opti onal non-fus ed disconnect, incom ing power wil l be wired into the di sconnect swit ch. Refer to Fi g. 13 for wiring for 100 and 2 00 amp disc onnect sw itches . Units with an MOCP (maximum ov ercurrent p rotection ) under 10 0 will u se the 1 00 amp disc onnect switc h. Units wi ...
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Bryant 551a - page 12
— 12 — T able 4 — Heat A nticipator Sett ings *Heater kW is based on heater v oltage of 208 v , 240 v , or 480 v . VIII. STEP 8 — INST ALL OUTDOOR-AIR HOOD The same type of fact ory-i n stal led hood is used on un its with 25% ai r vent ilation a nd units with an EconoM i$er . NO TE: The hoo d top panel, upper and lower filter retainers , h ...
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Bryant 551a - page 13
— 13 — C. Commissi oning The E conoMi$ er sav es ener gy when it uses outdoor air to provi de fr ee cool ing instea d of m echan ical a ir co nditioni ng . The Econo Mi$er swit chover stra tegy deter mines if the out- door air is sui t ab le for f ree co olin g . The Ec onoMi $er c hooses the sw itch over s trateg y with th e most en ergy savin ...
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Bryant 551a - page 14
— 14 — F . Me chanica l Cooling Loc kout Dete rmine t he out door -air tem peratur e at whic h you w ant the me chani cal co oling ( compr essors ) to b e disab led. Lo cate the mechanical cooling lockout (MECH CLG LOCKOUT) potentiometer . T o disable this feature, turn the potentiome- ter counterclockwise (CCW) to the OFF posit i on. Otherwise ...
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Bryant 551a - page 15
— 15 — H. V entilation Air ( Minim um P osition Set Up) If ven til a tio n a i r is n ot r e qui re d , ski p th is s ect io n. I f ven ti la - tion ai r is requi red, per form the f ollowin g: 1. The indoor fan must be on to set the v entilat ion air . Either put the thermostat in the continuous fa n mode or jump er the R an d G termin als at ...
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Bryant 551a - page 16
— 16 — Install Motormast er® I Contro ls Only on e Motorma ster I contr ol is req uired per unit. The Motormaster I control must be used in conjunction wi th the Accessory 0° F Lo w Ambient Ki t (purchased separate ly). The Motormas ter I device cont rols outdoo r fan no. 1 whil e out- door fan s no. 2 a nd 3 are sequenc ed off by the Accesso ...
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Bryant 551a - page 17
— 17 — MOTORMASTER SENSOR LOCA TION HAIRPIN END Fig. 26 — Motormaster® I and Motormast er III Sensor Locatio ns Fig. 28 — T ypical P erfect Hum idity Dehumidi fication P ackage C ont rol Box Fig. 27 — T ypical P erf ect Humid ify™ Dehumidificatio n P ackage Humidistat W iring Schem atic (460V Unit Shown) LEG END CB — Circuit Breaker ...
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Bryant 551a - page 18
— 18 — ST ART -UP Use th e fol lowi ng info rmat ion and S tart- Up Chec klist on page CL-1 to check out unit PRIOR to start-up. I. UNIT PREP ARA TION Check that uni t has been installed in ac cordan ce with th ese instal lation ins tructi ons and all applicable codes . II. COMPRESSOR MOUNTING Compre ssors ar e inter nally spring mou nted. Do n ...
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Bryant 551a - page 19
— 19 — If ou tdoo r air al one c annot satis fy the co oling r equir emen ts of the co ndition ed space, an d the OAT is a bove the MECH CLG LO CKOU T set p oint, the Ec onoM i$er in tegrat es fre e cooling wi th m echanic al coo lin g. This is acco mpl ishe d b y the strat egies bel ow . NO TE: Compres sors ha ve a t wo-mi nute Min imum On and ...
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Bryant 551a - page 20
— 20 — T able 9 — F an Perf ormance — 551A155 (With Standar d Indoor F an Motor) LEG END *Standard low-medium static drive r ange is 834 to 1064 r pm. Alter nate high-static drive range is 1161 to 1426. Other rpms req uire a field- supplied drive. NO TES: 1. Maximum cont inuous bhp f or the standard motor is 3. 13. The max- imum continuous ...
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Bryant 551a - page 21
— 21 — Table 10 — Fan Pe rformance — 551A15 5 (Wi th Optional Indoor Fan Motor) LEG END *Standard low-medium static drive range is 834 to 1064 rpm. Alter nate high-static drive range is 1161 to 1426. Other rpms req uire a field- supplied drive. NO TES: 1. Maximum continuous bhp for the optional motor is 4.38. The maxi- mum continuous watts ...
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Bryant 551a - page 22
— 22 — Table 11 — Fan Perfor m ance — 551A180 LEG END *Standard low-medium static drive r ange is 873 to 1021 r pm. Alter nate high-static drive range is 1025 to 1200. Other rpms req uire a field- supplied drive. NO TES: 1. Maximum continuous bhp for the standard motor is 6. 13. The max- imum continuous watts is 5180. Do not adjust m otor r ...
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Bryant 551a - page 23
— 23 — Table 12 — Fan Perform ance — 551A240 LEG END *Standard low-medium static dr iv e range is 1002 to 1151 r pm. Alternat e high-static drive range is 1193 to 1369. Other rpms req uire a field- supplied drive. NO TES: 1. Maximum continuous bhp for the standard motor is 9.47 (for 208-v units) and 10.33 (for 230 and 460-v units). The maxi ...
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Bryant 551a - page 24
— 24 — T able 13 — Ac cessory/FIOP Sta tic Pressu re (in. wg) LEG END NO TES: 1. Heaters are rated at 240 v , and 480 v . 2. The factor y assembled horizontal adapter substantially improves f an perf orm ance. 3. The static press ure must be added to e xter nal static pressure. The sum and the e v aporator entering-air cfm should then be used ...
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Bryant 551a - page 25
— 25 — T able 14 — P erfec t Hu midi ty™ D ehum idif icat ion P ackage Stat ic Pressure Dro p (in. wg) T able 15 — F an RPM at Motor Pulley Se ttings* *Approx imate f an rpm shown. † Indicates standard drive pac kage. **Indicates alternate dr iv e package . †† Due to belt and pulley style , pulle y cannot be set t o this number of t ...
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Bryant 551a - page 26
— 26 — SER VICE I. CLEANING Inspect unit interi or at begi nning of ea ch heating and cooli ng season and as operat ing condit ions requi re . Remove un it top panel and/or s ide panels for access to unit interior . A. Evapo rator Coil Clean as requ ired wi th a co mmercial coil c leaner . B. Condenser Coil Clean c ondenser coil a nnuall y and ...
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Bryant 551a - page 27
— 27 — 3. Loosen nuts on th e two carr iage bolts i n the mo tor mounting base . 4. Using jac king bo lt under m otor ba se , raise motor to top of slide and remove be lt. Secu re motor in this position by tighteni ng the nuts on the ca rriage bolts. 5. Remove the be lt drive . 6. Remove jacking bolt and tappe d jacking bolt pl ate. 7. Remove t ...
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Bryant 551a - page 28
— 28 — VI. CONDENSER-F AN ADJUSTMENT A. 551 A155 and 180 Units (Fig . 33) 1. Shut off unit power supply . 2. Remove acces s panel(s) closest to the fan to be adj usted . 3. Loosen fan hub set s cr e ws . 4. Adjust fan height on sh aft usin g a straighted ge plac ed acro ss the fan or ifice . 5. Tighten setscrews and replace panel(s). 6. Turn on ...
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Bryant 551a - page 29
— 29 — If the CONFIG button is pressed and held for more than 30 se cond s and rel e ased , the Econo Mi$er cont roller wil l enable the enthalpy compari son strategy (with outdoor air enthalpy and return a ir ent halpy sensor s install ed). VIII. PO WER F AILURE Dampers h ave a spring re turn. In ev ent of pow er failure, dampe rs will retu rn ...
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Bryant 551a - page 30
— 30 — E. Freeze Pro tection Thermo stat (FPT) An FPT is located on the top and bottom of the evaporator coil. It detects frost build-up and turns off the compressor , allowing the coil to clear . Once the frost has melted, the com - pre sso r ca n be r eene rgi zed. XII. RELIEF DEVICES All units ha ve relief device s to protect agains t damage ...
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Bryant 551a - page 31
— 31 — Fig. 36 — T ypical Wiri ng Sch ematic (551 A180, 46 0v Sho wn) ...
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Bryant 551a - page 32
— 32 — Fig. 36 — T ypical Wiring Sc hematic (55 1A180, 460 v Show n) (cont) Fig. 37 — T y pica l Com pone nt Ar rang eme nt (5 51A1 80 Sh own) ...
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Bryant 551a - page 33
— 33 — TR OUBLESHOO TING Refer t o T ables 18-20 for troub leshooti ng deta ils . T able 18 — Coo ling Service Anal ysis LEG END TXV — T hermo static Expansion V alve PROBLE M CA U SE REME D Y Compressor and condenser fan will n ot sta rt. P ower f ailure. Call power compan y . Fuse blo wn or circuit breaker t ripped. Replace fuse or reset ...
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Bryant 551a - page 34
Copyright 20 01 Br yant Heati ng & Coo ling System s CA T ALOG NO. 5355-10 5 T able 19 — EconoMi$e r T roubl eshootin g LEG END T able 20 — P erfect Humid ity ™ Dehumidifi cation Sub cooler Service Anal ysis PROBLEM PO TENTIAL CA USE REMED Y Damper Does Not Open Indoor (Evaporator) F an is Off Check to ensure that 24 v ac is present at T ...
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Bryant 551a - page 35
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Bryant 551a - page 36
Copyright 20 01 Br yant Heati ng & Coo ling System s CL-1 CA T ALOG NO . 5355-105 CUT ALONG DOT TED LINE CUT ALONG DO TTED LINE ST AR T - UP CHECKLIST I. PRE -ST ART -UP: VERIFY THAT ALL P A CKING MATERIALS HA VE BEEN REMOVED FROM UNIT VERIFY INSTALLA TION OF INDOOR F AN MO TOR ADJUSTMENT BOL T (155 UNITS) OR ADJUSTMENT BOL T AND PLATE (180, 24 ...
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