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Report (2) A t1c 2L2O-7oC 47 goo • , / 1(41 Carrier 50DP Electric Cooling: 120,000 to 180,000 Btuh Single-Package Electric Heating: 44,380 to 234,880 Btuh Rooftop Cooling Units RECEIVED 1) LZ5. JAN 2 2 2020 CITY OF TIGARD BUILDING DIVISION \bw of f{ I �\ • E i ner4 R u s rpR lsse• d in the cooling® 10 t t 15 ton range. Carrier i0 Carrier Corporation 1980 Form 50DP-3P C st Lot('iu eclat »1 1u.. (c_,onamercha1 coo i r' `11' e -)50/1IP 9 inell - -)a cc® . e Carrier's 50DP single-package,rooftop unit provides extra- factory installed in the unit or fully assembled for installa- ordinary cooling comfort at an uncommonly low cost. tion at the job site. - Ideally suited for offices, shopping centers, schools and Horizontal or vertical air delivery,curb-or pier-mounted, other commercial building types, the 50DP meets today's new work or replacement, the 50DP with quality standard high performance needs while delivering energy-efficient features and a complete line of accessories and options, operation. provides a system that will fit most any job plan. With Energy Efficiency Ratios (EER) to 8 3, you'll find For high quality, all electric, year-round indoor comfort • the 50DP a leader in operating effectiveness. The EER in the 10- to 15-ton range, choose the 50DP single-package rating reflects equipment cooling efficiency — the higher rooftop cooling unit with optional electric heat. Money the rating, the more efficient the unit. The 50DP rates savings and high performance are as close as your Carrier among the highest, which means the unit delivers more representative Get his answers about the 50DP today. cooling (Btuh) while consuming proportionately less elec- trical energy.The result is money saving,efficient operation. ARI CAPACITY RATINGS Available in 3 nominal cooling capacities 120,000,149,000 `' COOLING ST and 180,000 Btuh, the 50DP is compact, self-contained UNIT T KW L CAP. NET STAG FDARD ; EER and requires only one power connection point — a time ____ BTU/HR. and money saver at installation. Install the 50DP on the 50DP01 2 a 14.5 _ 120,000 I 4000 _ 8 3_ roof curb, connect field power and control wiring and you 50DP014 18 6 149,000 5000 8 0 have dependable cooling comfort at an affordable price. 50DP016 1 21 7 180,000 6000 8 3 Electric resistance heat is available to provide indoor NOTE Capacities for 50DP014,016 are not within scope limitations comfort all year long Heaters are UL listed and come of ARI Certification Program 01) • `..-- .� ` Y 1 1 f i . V �% (r�� ---1. _ COCU Base Unit 1, + ° % % Q Compressor (016) 6 1 � t ; C Compressor (012, 014) 1 "gA. fk • , 61 Indoor Air Fan .. s• . .— r - °- Control Box I 1 • Y;; VL 2 <� >f � � 1c 11 ) c1� � ' u ton fr vturos tre easy )u ll,>>� C iait, c a top perfalrfall Taco. ® Reliable, high performance cooling power — Carrier- Tough units for rooftop operation — Weathertight specified hermetic compressors (012 and 014) and semi- Weather Armor cabinet stands up to extreme outdoor hermetic (016) are equipped with crankcase heaters, conditions. Carrier design meets both UL and Carrier's internal linebreak for protection against overcurrent and own stringent rain test requirements. Strong, watertight overtemperature conditions and Cycle-LOC"compressor interface between unit and roof is provided by the specially protection. Solid state Cycle-LOC prevents compressor designed roof curb, approved by the National Roofing short cycling by shutting off compressor if any safety device Contractors Association. trips. Compressor is restarted by manual reset at the room UL listing—The base units in all voltages except 575 volts thermostat (except for 016 unit which,if compressor shuts are UL listed;all voltages are CSA listed.Electric resistance off on overcurrent, requires circuit breaker reset at heat,when factory installed or as a field-installed accessory, the unit). is designed for single point power connection for quick installation. Fully UL listed. Many competitors offer their Quiet,high volume fan operation—Indoor fans are belt units as having UL recognized components or meeting driven with adjustable drive for quiet and efficient opera- NEC requirements. It is the UL and CSA listing, however, tion.Outdoor fans are direct driven,factory lubricated,and that assures the customer that the equipment meets the positioned for quiet efficient vertical discharge. In addition, standards of most local electrical and safety codes. indoor fans are capable of moving ample air quantites and Trouble-free rigging All units are built as an integrated achieving high external static pressures suitable for the unit — rigid and strong, making rigging simple and con- most demanding application. venient. Predrilled lifting holes in the base rails make the Refrigerant coils — Built with energy-efficiency in mind, rigging job still easier the 50DP cooling coils feature staggered copper tubes and Convenient duct connections — Openings in the base- mechanically bonded aluminum fins to give you the most pan permit side-by-side or concentric ductwork connec- for your cooling dollar tions without requiring unit internal modifications. Side connections for horizontal duct applications can be made Terminal board — Located in base unit control box for using side-supply curb accessory. Gasketing is provided easy connection to room thermostat, outdoor thermo- with roof curb for a weathertight installation stat(s), economizer and electric heat Ventilation air — Standard equipment includes manual damper which can be preset to admit up to 25%outdoor air Part-load operation— The 10-ton and 121h-ton units fea- for year-round ventilation. Units equipped with economizer ture 2 hermetic compressors and 0%, 50% and 100% ca• have a thermostatically controlled fully modulating damper pacify steps. The 15-ton unit uses the rugged Carrier 06D which admits up to 100% outdoor air and provides low- compressor with capacity steps of 0%,67%and 100%.Part- cost cooling on mild days. The changeover to economizer load operation assures you high energy efficiency and lower cooling is done by an enthalpy control to take full advantage utility bills. of low-cost operation in mild weather. Q_ )jr�it.iiawiii and 1c: c >rC 1 ovide- )fl i1(.0D iflXfdafin 1 i (s, ilDill i i Variable air volume option employs An adjustable 7-day timer provides electric unloaders to match system round-the-clock operation. Also in- cooling capacity to varying load require- cluded is an ON/OFF switch. The ments and interlocks compressor prewired, factory-installed monitor •-.__-.._, operation with economizer operation _Ve "°�p p panel includes everything necessary to for maximum energy efficiency. assure proper variable volume system • �'"Ca-00t' operation. Capacity control occurs when a dis- a charge air thermostat, responding to discharge air temperature, regulates an unloader step controller and thus loads '`' '''`.iiiii "'"' and unloads the unit On a rise in supply , ,e S. , ,, ` air temperature, the controller allows A ;^ the economizer to act as the first step in tip. i..f rs cooling (provided the outdoor air is • ° ' below the enthalpy set point of the • cy ` r changeover controller). As the supply I, r; ;a, i }, f 3s+ air temperature continues to rise, the s , y r economizer moves to vent position and ` ft' �:� S x the compressor loads up sequentially . tit <' until it reaches 100% capacity ,�.. , - , 3 e O t o s a dac , so i (ci n ) . Motormastero Head Pressure Con- Time Guard® circuit protects corn- Economizer assembly — Provides trol —Units are designed to operate at pressor against"jiggling"of thermostat; low-cost cooling on in-between days. outdoor temperatures down to 35 F. automatically prevents compressor Automatically controlled dampers open Below 35 F, accessory 32LT Motor- from restarting for at least 5 minutes to admit cool, filtered outdoor air.Out- master control modulates outdoor fan after shutdown. Accessory prevents door air damper is fully gasketed for low motor to maintain correct condensing short cycling of compressor if thermo- leakage. Low leakage dampers save temperature at outdoor temperatures stat is rapidly changed. Field-installed energy because outside air leakage into _ down to-20 F.Field-installed accessory. accessory. the unit is minimized when the out- door air damper is closed. Compres- sors and outdoor air fan remain off to save energy if the outdoor enthalpy is �, E low enough to satisfy cooling require- ments without compressor operation : i.` • • " 2 E Economizer is factory option or field- *Vail_ x 41MB : installed accessory. Easily installed • c, because of complete factory assembly I1 and comes complete with wiring plug _- ` 3 ,+ ` - for quick connection to base unit. r -*Power exhaust — Coupled with the economizer, up to 75%of the return air . . � N at 0 4 in wg static pressure may be ex- control panel consists of a ex- hausted. Also eliminates overpressuri- Remotezation of the building. Designed for use separate heating and cooling thermo- with bottom duct connection arrange- stat assembly plus a decorative wall- Thermostat assembly—Precise tern- ments. Field-installed accessory mounted panel. In addition to switches perature control for cooling systems for heating, cooling and fan operation, and optional heaters is provided by this the panel contains indicator lights and, attractive wall-mounted 24-volt acces- for economizer-equipped units,a venti• sory. One- or 2-stage heating available, lation control knob. Field-installed depending on base unit and application ^"'"' . accessory requirements. A thermostat subbase is available />' o r that goes hand-in-hand with Cycle- iwA Y� ""� LOC'"circuitry. If a safety device trips, f . yvi'.•. :`.,,; compressor shuts off and light on they- 4 M mostat comes on. Reset is accom- ;;„„,.....N. 01" .,,," t. si plished by following standard Cycle- :; freasolg LOC procedures Field-installed Saccessory. Electric resistance heaters-Corn- o�70� :: plete with high temperature limit _ �: n _-.-. switches and overcurrent protection. . Offered in 3 heating capacities for each -. unit size When heaters are installed, 1 unit electrical input is single point at the factory-supplied terminal block. Con- L ® nection point is suitable for copper or Relief damper operates automatically aluminum wire Available as factory- to help exhaust stale indoor air during installed option or field-installed acces- economizer operation Accessory sory, both UL listed for use in the unit comes fully assembled for easy The accessory heaters are fully factory installation assembled for slip-in installation with an Roof curb with insulated basepans Indoor fan motor and drive — Pro easy-connect wiring harness. supports unit and frames roof opening vides increased performance for appli- for plenum and interior ductwork cation requirements beyond standard When curb is in place and ductwork unit operation range Factory-installed connected, unit can be installed any- option :` ': time, to meet your tightest schedule. Two-position damper—Single blade Curb design meets all National Roofing damper, operated by a spring return .';<;i Contractors Association (NRCA) re- motor,closes off the 25%air inlet when 4. quirements Field-installed accessory. unit is shut down. Field-installed ^r accessory Hydronic coil installs easily into elec- tric heater compartment. (Both cannot be used simultaneously) Designed for add-on type applications or new work where boiler system is utilized. Field- installed accessory. • 4 . Base unit dimensions 25%AIR OR ECONOMIZER HOOD 6 0 „ S`-1I 7 �' '%i=;'' COMPRESSOR 3'-84 ,;t END' 3- 3 1 KO a ` PT DRAIN __.- -- r CONNECTION I 3 e &s KO (BOTH SIDES) - 3" I' 2 if KO � .7 68. 5- 9 2DIA DRAIN HOLE �'`, 5 6" 1101 ' t (BOTHSFOES) t4"HOLE (4 PLACES) I ��' ALTERNATE`�II REAR RETURN MR - 'I T-3! V I EW PANEL 2` ° rT a r 4` pff I EA ' ENTRANCELECTRIC L .' ::, ...........::: 'V :.n' 1 f .1 { Y • 6.. OUTDOOR AIR FANS r' p a i` 25.AIR OR ECONOMIZER RHO OD RECTRiC HEATER \.\ ACCESS PANEL , \ *UNIT CONTROL O BOX ACCESS 1°' PANEL \\ >> INDOOR COIL . 2"KO \� _� RETURN .„.. 3- KO \ \ AIR * 3 wS„ a HOLE COMPRESSOR ii ��s*1� END \ SUPPLY If I' AIR ,.s- 73' 9 onponroonto• OUTDOOR COIL f 1— �_ —� 21-61 `� 5.. _ I p�DRA1N I ,Jrf' 1110 �" ,FPT DRAIN HOLE FRONT VIEW CONNECTION r SPACE REQUIRED FOR E>INDOOR AIRFLOW *OUTDOOR AIRFLOW , >ALTERNATEAIRFLOW 1.=(`` "````VVVVVV ���777 ' y� SERVICE AND AIRFLOW b Accessory dimensions . el. ouTuNE0,:itifT PLAN VIEW OF ROOF opi N:NGS NOAI.Ifx 4" ROOF CURS (321x 1102) _r_ _ / -.'f-----/--._, ___, TYR A PL.AS MITERED CORNERS 1 Winiii1i1X::::Pr.- - i 4 (TOP ONLY) • 4i.ine1:1"--. 0.• . , ililK*ks:::: 0'.-4. , _.--"------1-1-', . (SLCCK OFF ."-•' • (43) i.......„.>•„---- ---. i i --...- PAN POR SIOE ninM"' •-•...,, i ,---- - -----. CI'-Ii" /SRETA IADLY 4:•:gi-.:,•,:1•:...s1.,, •.. i...-#. - 0-If i r.`•,....ny- . eenel*Ng COMP (44) 4.4- ,„"" T•• r'-'• .---•-•.. (44) '''''S.!*-• AS-r) ff „yi---...... ..... -- ->- -•. (:)‘-.1* SECTV•i"---i....,n :ii1.•:.nr.' :: Inf.' ` l'. :•:.',.% 1 „''',:•.:-... ..._ (32 , A :.if• ci A !..- .. --.-r- GASKET f Nil':l .'?/, •-•Ole 3 •••..... BASEPANS „ --,..---„,%.,_ , , .-.7 W";,,,,T, :.:::•:es. 411 ^NTRAKE ' NN ---.,r--- .n ., • ;ECTION ri .... .. 1 I.T.,••...:'1.I.. N. '-'• NL, N. N.. -.N.„,..„. NN '`t ,,), -'.?•-. 1'-.7•11- r-oi e-lot . e-21 11,...BASE UNiT (1703) N, N. ' •' Z676) "**6) i N .4'. •- A 11 GASKET(SOPFLIED LI ''''''' a/88 (457) WITH CURB) NDTE 3 DIMENSIONS(ft-in.) UNIT A B ' C n DESCRIPTION !L.-- ..-, ••--•. 50DP012,014 ' 1-0 i Stan:land REF. , /Y.00TS)17E Ai A . • &01 6 ^ — (305) . Curb 0-21 :1 4"'•----NAII7-- 157) ' OPTNDNAL SODP012,014 2-0 Double Height ,-4-''''REn:R24 .:.'')!! COUNTER FLASHING 1-2-7: ''.. .....,...*•""''... , • &016 - -- t6101 Curb .•r- ,,,,e ',::::r"--FIELD SAPPLIED itIlr-, FDUCTIELD - n'i'•:ii'S SODP012,014 04-1/8 0-2-1/2 2 0 , Side Supply i -,--- . 1 t , , _: ROOFING FELT &016 CISS) n64) (610) : and Return Curb S.IPLIED -...••:...)„„....---FIELD SLiPPLIE0 - -•• • , (SEE NOTE 21 Isill, 02,1-r ma, NOTES: 1 Dimensions in parentheses( )are mil)imeterS ' ;-.. . FIELD SUPPLIED 2 Attach all it ucrworir,to roo(curtn --Y 3 These PunenSion$apply to side supply and return cure only SECTION A-A ROOFNG ROOF CURB RIGID INSULATION FIELD&APPLIED MATERIAL FIELO SUPP•-IE0 25%VENT AtR/ —_—,, C.Illir \$j '. ECONOMtZER HOOD '4% 4% AIR 0 IN %% oc,KoFF PAN ta% r—I'-7 --al IS • J AIR 1 1.-Sf ' - / ,.....-'// I SIDE SUPPLY CuRD— / no...o SUPPUED .-.: : ••'.i:: (50130900150 TRANSITION DUCT ••••InIni _:i'n'nIn SIDE SUPPLY/RETURN CURB •::::::: 6 ..ii?:•::. 0 0 -;,: ccet4soleylreenstC a nt (coat) 4r ' ._ 2 a --r, ,r VENTILATION4110 � I MAX©OFF {�-y- NORM 1 S 5. m— SYSTEM ❑ I II ❑ I I I• NEnr 60 70 80 90 T- 0,F El I I 3: ❑ I I 14;. rQ 10 $ [ I FAN 0 CI I I 35 aN e Adel T° ESA Imo—2. A �r ACCESSORY ZONE THERMOSTAT I I I n r —L I' T I -5—;- 1-fix_ "-WACCESSORY REMOTE CONTROL PANEL ACCESSORY REMOTE CONTROL PACKAGE f)) 1 vG vo 4 • UNIT SIZE—500P 012 014 016 OPERATING WEIGHT(lb) Unit 1350 ! 1410 1590 with Economizer 1500 1560 1740 Roof Curb 200 200 200 COMPRESSOR No ,Type � 2 P( )64 2 P( )77 1 06D( )537 Capacity Steps(%) 0, 50, 100I. 0. 50, 100 0, 67, 100 REFRIGERANT 22 . __ ._ Charge (Ibs) Sys 1, Sys 2 7 9, 6 6 8 3, 8 3 — 232,— CONDENSER COIL -_ - __.�_-- . -_ I__- _ --- . 14 Aluminum Plate Fins per inch Rows 2 3 1 3 Total Face Area(sq ft) 18 9 �� 18 9 ..__ 18 9 OUTDOOR AIR FAN Propeller Type, Direct Drive Nominal Cfm 9000 8000 12,000 No . Diam (in.) 2 22 2 22 2 26 Watts Input 1385 1400 — 2672 EVAPORATOR COIL(Copper Tube) Aluminum Plate Fins per Inch 14 15 14 Total Face Area(sq ft) 14 7 , 13 8 16 5 Rows 2 3 3 INDOOR AIR FAN Centrifugal Adjustable Belt Drive Qty, Size(in ) 2(10x10) 2 (10x1Q) 2(10x10) Nominal Cfm 4000 5000 6000 Max Rpm 1550 1550 1550 Rpm Range—Std 753-1066 805-1093 916-1186 —Alt 878-1191 978-1265 1159-1429 Max Allowable Rpm 1550 1550 1550 Fan Pulley Pitch Diam(in ) —Std 5 5 6 0 6 4 —Alt 55 60 64 Motor Pulley Pitch Diam—Std 2 4-3 4 2 8-3 8 3 4-4 4 —Alt 2 8-3 8 3 4-4 4 4 3-5 3 11, Motor Hp[SF](Nominal 1750 rpm)—Std 1 [1 251 2[115] 3 [1 15] —__ —Alt 1-1/2[120] 1 3[115] 3 [115] INDOOR AIR FILTERS (50DP) TYPE — 10%efficient, Disposable Fiber Glass No ...Size(in [ (4) 16x25x2 (4) 16x25x2 (4)20x20x2 (2) 16x20x2 (2)16x20x2 (4) 16x20x2 SF — Motor Service Factor 7 e ttho procedure (wit example) I Determine cooling and heating requirements at field conditions dictate, the optional drive may make a design conditions. better selection because of its ability to be adjusted Given: to higher rpm's. 41110 Cooling Capacity Required (TC) 179,000 Btuh V Select unit that corresponds to power source Sensible Heat Capacity (SHC) 128,000 Btuh electrical characteristics. Condenser Entering Air Temperature 95 F Edb/78 F Ewb From Electrical Data table, select 50DP016 unit with . Indoor Air Temperature 80 F Edb/67 F Ewb 230-v, 3-ph, 60-Hz electrical characteristics. Evaporator Air Quantity 6,000 cfm VI Calculate EER for full load operating condition External Static Pressure 75 in. wg of unit. Heating Capacity 76,000 Btuh Power Supply 230-3-60 Re-enter the 50DP016 Cooling Capacities table at 80 db, 11 Determine unit size. 67 wb entering air on the indoor coil and 95 db ambient on the outdoor coil. At this condition, the compressor Select unit based on cooling requirements. kw input is 16.3 kw or 16,300 watts. Enter 50DP016 Cooling Capacities table at given cool The outdoor fan watts from the Physical Data table ing requirements. Read that at 95 F condenser entering is 2,672 watts. Using the bhp previously determined dry-bulb and 67 F evaporator entering wet-bulb at 6,000 from the Fan Performance table, at 6,000 cfm and cfm, unit 50DP016 provides a Total Capacity of 187,000 0.75-in. ESP,the watts input can be calculated using the Btuh and a Sensible Heat Capacity of 135,000 Btuh.For formula and motor efficiencies on the Fan Performance indoor air temperature other than 80 F Edb, calculate table page. sensible heat correction using formula in notes follow- ing Cooling Capacities table. 2.96 x 746 Watts input = = 2,629 watts 111 Select electric heat. 0.84 Heating load required is 76,000 Btuh. The gross capacity must be reduced by the indoor fan 76,000 Btuh heat to get net cooling capacity. 3,414 Btu/kw = 22.3 kw of heat required This is then divided by total watts input. Enter the Electric Resistance Heater Data table for the Gross capacity - (Indoor fan watts 50DP016 at 230-3-60. The 31 kw electric heat most EER = x 3.413 Btu/watt) closely satisfies the heating required. Compressor watts + Outdoor fan watts IV Determine fan speed and motor hosepower re- + Indoor fan watts •' quirements at design conditions. 187,000 (2,629 x 3.413) Enter Fan Performance table for unit 50DP016.Interpo- = late to see that at 6,000 cfm and 0.75-in. wg external 16,300 + 2,672 + 2,629 static pressure, the fan speed is 1184 rpm and bhp is 178,027 2 96. The standard motor and drive is suitable but if EER = 21 601 = 8 24 Btu/watt -> STATIC PRESSURE LOSSES* (in. wg) ACCESSORY/FLOP CFM `Static pressure losses must be added to Electric Heaters external static pressure before entering Fan MODEL Unit Vottage ' Kw 4000 , 5000 i 6000 Performance table I 14-17 05 i 07 09 208-230/3/60 26-31 05 07 09 42-52 06 08 12 50DP012,014 _ _ _ 56 07 10 15 16 05 07 09 460/3/60 30 05 07 09 51 06 08 12 _ 26-31 05 07 09 208-230/3/60 42-52 06 08 12 50DP016 - -- - __ 56-69 07 10_ _ 15 30 05 07 09 411 460/3/60 51 06 08 12 73 07 10 15 Economizer 03 05 07 Hydronic Coil 18 26 35 8 I r . once data (cont.) COOLING CAPACITIES 50DP012 50DP014 • Temp IF) I Evap Air - Cfm/BF Temp (F) Evap Air- Cfm/BF -� Air Ent } 3000/ 153 00 40/ 187 : 5000/ 216 Air Ent I 3750/.058 , ' 000 5 /0090_I 6250/.125 Cond Evap Air - Ewb (F) Cond Evap Air- Ewb(F) (Edb) 72 67_ 62 72 67 Cr2., 72 67 62 (Edb) 72 .1_67 1 62 72 €67 t 662 " 72 167 162- TC 132 123 110 IV, t2$ 0$ 138 131 124 TC I169 156 140 174 163 f4911801169 163 99 ' 145 105 143 163 85 SHC 1 65 81 95 �kl 1.09' 75 99 120 85(SHC • 85 106 125 82 127 < Kw 12 2 11.7 11 1 1 2.4 33& 71 4;t12.5 12,1 11.7 Kw 15 0 14.3 13 5 ]Si4 f4.$ i14.] ii15.6 15.1 14.8 i. TC 128 116 100 133 323 ##O; 135 126 I117 ITC 162 147 128 168 1'64.H.40 ;175162 156 951 SHC, 63 79 91 70 90 105` 75 99 ' 117 95 I SHC 82 103 120 92 117 #140. 106 1142 156 fKw 13.0 12.3 11.9 Y32 123 9 11 13.4 12:9 12.3 Kw j160 15.1 144 16.4 56-149 1671160 15.7 TC 122 107 90 127 334 F00 130 119 } 109 TC 1153' 1351 115 159 144 130 1167 152 148 1051 SHCI 61 75 85 68-1b' 87 300: 73 97 109 105(SHC I 79 98 113 88 114 1 130 105 140 148 "Kw 13,6 13,1 12,6 't•3'933# 129' 141 13:5 ' 13,1 , JKw- 168116,0 153 17,3 164c15.9f 17,7 168 16.6 115ITC 113 96 81 '120 'f03 92' 123 109 101 TC 143 121 103 149 129 i 119'II. 156 140 138 SHC 58 71 80 66 33 92'y 72 93 101 115 SHC 1 76 , 98 103 85 109 1119 i 102 135 138 I 144 138 133 146 14d 438 1481142 139 Kw 1761169 164 18:1 17.31169;185 176 175 BF -- Bypass Factor 50DP016 Edh - Entering Dry-Bulb ,_ Ewb - Entering Wet-Bulb Tern (F) Evap Air- Cfm/BF Kw - Compressor Motor Power Input P -- - - SHC - Sensible Heat Capacity(1000 Btuh) Air • 3000/.056 4500/.086 ;'6000%.112 7500/.136 TC - Total Capacity(1000 Btuh) Cond Evap Air - Ewb (F) _ TLDB - Temperature Leaving Dry-Bulb (Edb) 72 ; 67 62 i 72 67 62-i.72 ' 67 `62 172_ f 67 62 1 Direct interpolation is permissible Do not extrapolate TC 186' 169 151 203. 188 169 212 196¢:180 224 208 196 2 The following formulas may be used SHC 89 105 120 98 122 145 105 t 133 i 167: 120 158 ; 186 sensible capacity(Btuh) 85 Kw 156',149 14.21163 155 146 16.3. 636;034.5 170 163 156 tldh = tedb - 109 x cfm TLDB 52,8'47.9 43.3'600 55.1 50.4 639 589':54.5, - - - _ tlwb = Wet-bulb temperature corresponding to en- TC 179 158 136 1961 178 154 :1204 187. 168' 216 199 188 thalpy of air leaving evaporator coil(hlwb) 95 SHC 86 100 113 t 95: 119 138 103 1351 161. 117 155 178 total capacity(Btuh) Kw 167 160 1541174 164,158 172 163 155 182 173 167 hlwb - hewb 4 5 x cfm TLDB 53 7 49.4 45.4160 61 55 7151 9 4594 55 4_ - - - TC 168 144 121 186, 164 138 t94 175 156 205 188 178 ewbe= Enthalpy of air entering evaporator coil 105 SHC 82 94 106 1 91 1113 130 ;i.Q1 `330�.`34$ 115 152 168 Kw 178 171 16 5118 5 176 169 3831 8<7$ .'Se193 183 178 3 SHC is based on 80 F edb temperature of air entering TLDB<54.9 51.347.6161.41 57.0153 5 64 6 603 $72iA - - { - evaporator coil IC 155 130 108 1751 149 126 183 358 :144? 194 172 '' 166 Below 80 F edb subtract(corr factor x cfm)from SHC SHC 76 88 100 871 107 120 °97 '12 1 136 112 147 157 AboyP,MiE dk.:A.4(c tit: Ctflt.X0m to SHO' 115 Kw 19 0 18.3 17.5119 5 18 8 18 2 119 47 8 t8 d 20 4 19 3 19 1 TLDB 56 8 $3.1 49.4162 3 58 2155 5,.65 2-'61.0 592f - - - ENTERING AIR DRY-BULB TEMP(F) Ratings apply only to units with variable volume option BF 79 ..75 77 76 f„2,6�4 vndet 75 81 . a8Z -c 53 : _F 8 :_3_W rover85:1 ; Correction Factor 01 107 I 216 324 I. 432 540 use formula 05 1 D4 207 ( 3 11 414 518 shown below .10 .98 1 96 12 94 3.92 4.91 Interpolation is permissible Correction Factor = 1 09 x (1 - BF) x ledb - 80) -* ELECTRIC RESISTANCE HEATER DATA HEATER KW HEATING MA IMUM HYDRONIC COIL CAPACITY 50 UNIT (208t Vol 460( S AGES a/0 HEAT { STAGES* -t PER STAGE STAGES" . .. . . CFM 4000 -.�- 5000 6000 _ 14 17 16 1 100 1 Ent --�- 26 i 31 30 '. 2 50/50 2 012,014 Fluid Cap GPM OP Cap GPM a Cap GPMII AP 42 52 . 51 2 33/67 3 Temp (F) - -i 56 - - I 2 50/50 4 -fff - _ - 200 , 259 27 1 21 294 31 1 5 325 35 i 1 8 26 31 30 2 50/50 2 Ill 180 207 22 0 9 235 25 1 1 259 27 1 3 016 42 52 51 2 33/67 3 160 156 16 I 0 6 176 19 0.7 194 20 0.8 56 69 73 2 1 50/50 L_ 4 1 Ratings @ 70 F entering air temperature with 25%by volume 'Maximum number of stages using accessory outdoor air thermostats ethylene glycol 2 A P is fluid pressure in ft of head 3 Cap is 1000's of Btuh 9 r oor to c . t (drat) - FAN PERFORMANCE UNIT EXTERNAL STATIC PRESSURE (in wg) MODEL CFM ' 0 20 0 40 0 60 1 0.80 1 1 00 1 1.20 1.40 I 1 60 1.80 I 2 00 50DP ,Rpm Bhp 1Rpm Bhp Rpm; Bhp 1Rpm IBhp ;Rpm Bhp !Rpm Bhp Rpm IBhp IRpm Bhp .RpmI Bhp IRpm IBhp 3000 630 0.39( 733 '0 53 ' 826 0 64 910 0 78 : 988 0 92 1062E 1 08 1135 1 26 1 E 3200 659 0.45. 755 0 58 846 0 72 929 0 86 1004 1 01 1076 1 17 1145 1 34 11213,1 53 3400 689 0 53 779 0 66 869 0 80 948 '0 95 1022 1 11 1091 1 27 1158 1 44 T2223 1 63- 128.7 1,83 t - i 3600 719 0.61 804 ,0 75 890 0 90 967 1 05 1041 1 22 1108 1 38 '1173 1 56 :€235 3 1 74 12961.1.94 1357 2 16 3800 750 0,70 830 0 85 ; 912 II 00 99811 16 1060 1 33 1126 1 50 t 189 i 68 132501 t 8'7 1309;2,07 13671y2,28 012 14000 1782 0 BO 1; 857 i 0 96 935 '1 12 1010.1 28 1079 1 46 1146 1 64 11207 11 82112663 2 01 1324>2.21 1379 2,42 '4200 814 0 91 885 1 07 959 II 24 1032 1 41 1 100 .1 59 1 165 1.78 11226 111.97 11283 2 16 .134012.36 3394 2 57 4400 846 1 03 ' 914 1 20 984 137 1054 156 1'22 1.74 1184 1,9311245 1 2,13 :1302 233 1356 2:53 1430 .2.74 4600 879 1,16 943 1 33 1010 1 52 1077 1 71 1143 '1:90 11205 2.09 126412,30'13 321 2 51 .i 375,2.71 1426,-i2 32 4800 912 1 30 973 1 48 1036 1.67 :1101 11 87 p 1165 )2 07 i 1227: 2.27 1284 12.47 {3.340 2.69 1394E 2,91 1444::'9.12 5000 945 1 45 1003 1 64 1064 1 84 1.1126 204!1 188 12 25 1248 2.46 1305)2.67 3 359 2.89 1413 E 3;12 1463 .3.34 3750 732 0.77 848 0 94 1 949 i 1 10 '1041 '1 26 :1 124 '1 43 1194 161 '.1247 1.80 I274 1.99 - r 4000 764 :0.901 876 11 09 1974 ,1 25 31065 1 42 1146 1 59 1221 1 77 E1284 3.97 1331 2_17 1357 2,37 ; 4250 797 1.051 904 1 2411001 1 42 1089 1 59 1170 1 78 1244 1 96 :1312 2,15 1363 236 1413 2.57 144022.78 4500 831 1 21 934 1 41 11028 1 61 1113 1 78 1193 1 97 11267 12-16 11335 2.36 1398 257: 1461 f 2.79 1493 3 01 4750 865 1 38' 965 1 60 11056 1 81 1139 1 99 1217 2 19 t3290;.12.39 11358 2,59 1422 2.60. 148013.02 1531:.3 24 014 5000 ' 900 1 58 996 1 80 1084 2 03 1166 2 23 1241 2.42 S1314 12,63 1381 2.84 3444`3.05 1504 3,27 } 5250 935 1 1 79 1028 202 1112 2 26 1193 248 !1266 2.67 11338 12.89 .3 405 3.11 1468`3 32 1527)3.54 1 5500 971 1 2 021106012 26 1142 2 51 1221 2 74 11294 2.96 13362 13.16 .1429 3,39 1491 y 3.62 - - ' 5750 100712 27 1093 2.52 1173 2.78 1249 3.02 111321 3.26 )1387 13.47 '1452 3.69 1516)3.93 ' - 3 - 6000 .1044 2 54'1126 2 80 1205 3 06 F1277 3:32 %1349 3.57 11414 13.80 1476 4.02 1539;4.27 j'j 6250 1080 2 83 1159 3 10 1236 3 37 1.3307'3.64.11377 3.91 1441 14 15 1502 4.38 i- i j - - ' 3000 - - - ] 940 089 1038 I1 13 1115 1 37 1 167 11 53 1193 1 56 1201 1 40 1 198 107 3300 - - (,- - ( - - 951 0 98 104911 22 1 138 ;1 50 1211 1 76 1265 1 97 1299-208 1316 204 3600 1 _ 1 - - 1 - ` - ` 966 1 10 1059 11 34 1 149 1 60 1231 1 90 1301 2 20 1357 2 46 1 398 2.64 3900 1 1. :- ` - 986 125 1073 147 1159 173 1241 203 1318 235 1386 267 1443. 2:97 4200 1 - 1 -- 929 1 24 1012 1 43 1091 1 65 1172 1.89 1251 2 18 1328 2 49 1400 2 83 1466'.318 4500 79011 02 3 879 1.23 960 143 1039 1 64 1114 1 85 1189 209 1264 236 1338 267 1410 3 00 1479 3,36 4800 8301121 i 915 1.43 1 993 5100 870 42 953 1 65 1028 1 64 106811 86 1140 '2 09 1210 2 32 1280 2 58 3 351 2 88 1420 3 20 1488;3.55 ' 016 1 88 1099 2 11 1168 12 35 1235 2.59 1301 2 85 1367 3 13 1433 3::44 1499 3.78 5400 911 1.66 1 991 1 90 E 1063 2 15 '1131 239 1 197 2 64 1262 2 89 1325 3 15 1386 3 42 1449 3 72 1512 4 05 5700 952 1 92 11030 2 18 11099 2 44 '1165 2 69 1228 2 95 1290 3 22 3351 13.48 1410. 3,76 4;0 11468 6 1528: 4 37 6000 994 2 21 1069'2 48 1 136 2 76 1200 3 03 1260 3 29 33203 57 1376 •3 85' 1436 4:13 f3492:4.43 i547;4.73 6300 1035,2 53 ,1109 1 2 82 1 174 310 1235 339 1294:13.67 1351 3 95 E 1408 :4.24 3 463 4.54 1518 1484 , - 6600 '1078 2 88 1 148..3 18 i 1213 3.48 1271 3.78'1329'34.07 1384 4,37.1!1433 E4.67 14.92 4.98 3544 15 29 6900 1120'3.26 1188 3.58 11251 3-89 '13*, 4.2013364 14.51 1417 4,82 11470 15.13 11522 5.45 - E'---- - - �1 7200'1163 3.68 1229`4.01 11290 4.33 1347 4 66'1400`4 98 1452 5 31 1 - 1 -- 7500`1205.4.13 1270 4.47 31329 4.81 1385 5 15 11437 5 49 - - - - -• - - .1. i ( ( Standard motor and drive NOTES Optional motor and drive(016 unit offered with optional drive only) 1 Fan performance is based on wet coils, . I, Field-supplied motor and/or drive 1 clean filters and casing losses 2 Add electric heater pressure loss to Rpm - Revolutions per minute external static pressure required before Bhp - Brake horsepower input to fan using table Conversion - Bhp to watts 3 Motors have service factors as shown in Bhp x 746 Motor efficiencies physical data table on page 7 Watts input = Motor efficiency 1 Hp - 0 81 4 Condenser fan watts input 1-1/2 Hp - 0 78 50DP012 1385 watts 2Hp - 0 83 50DP014 1400 watts 3Hp - 0 84 50DP016 2672 watts AI L 10 ili LEJr. Ci. 1CUl di. di - 50DP012 • — ^— VOLTAGE OUTDOOR INDOOR FACTORY- POWER SUPPLY VOLTS/PH/HZ RANGE COMPR FAN MOTOR : FAN MOTOR IN HEATER Min MOCP 1 -- _ .-. Ckt Min Max RLA I LRA Qty ' FLA Hp � FLA � FLA Kw Amp (Amps( 1 0 f 3 45 — 70- 60 70 1 5 5 5 — — 70- 60 70 1 0 3 45 72- 82 26-31 100-110 90 208-230/3/60 167 253 24 113 2 4 6 1 0 3 45 117-135 42-52 155-180 150 1 0 345 39- 47 14-17 70- 60 - --- '70 1 5 5 5 72- 82 26-31 100-110 90 1 1 5 5 5 117-135 42-52 155-180 150 1 5 5 5 39- 47 14-17 70- 65 70 - 1 0 1 6 — — 30 35 15 26 — — 35 35 10 16 39 30 55 50 460/3/60 414 508 10 5 49 2 2 1 1 0 1 6 66 51 85 $Q 1 0 1 6 21 16 30 35 1 5 2 6 39 30 55 50 1 5 2 6 66 51 90 80 1 5 2 6 21 16 35 35 575/3/60 518 632 [ 8 3-1— 41 - 2 1 8 1 0 1 35 _ —1.,. 25 25 1 5 1 7 25 25 "" 1 Fuse only, unshaded values indicate fuses or circuit breakers may be used Compr — Compressor LRA — Locked Rotor Amps FLA — Full Load Amps MOCP — Maximum Overcurrent Protection Hp — Nominal Horsepower RLA — Rated Load Amps -+50DP014 VOLTAGE OUTDOOR I INDOOR FACTORY- POWER SUPPLY VOLTS/PH/HZ RANGE COMPR INSTALLED Min FAN MOTOR FAN MOTOR HEATER Ckt MOCP -- - — --- - -._.. - -- - - (Amps( Min Max RLA LRA Qty FLA I Hp FLA FLA Kw Amp 78 30 84 — 81 90 2 0 7 4 72- 82 26-31 110-112 100-110 208-230/3/60 187 253 27 0 137 2 4 6 2 0 7 4 117-135 42-52 152-179 125-450 2 0 7 4 39- 47 14-17 78 90 3 0 j 8 4 72- 82 26-31 104-116 110 3 0 8 4 117-135 42-52 160-182 150.175 3 0 8 4 39- 47 14-17 .1 81 90 -- — 20 33 ( — — 35 40 3 0 4 2 — — 40 40 20 33 39 30 55 50 460/3/60 414 508 11 6 69 2 2 3 2 0 3 3 66 51 90 80 20 33 21 16 35 40 ' 30 42 39 30 55 50 30 42 ( 66 51 90 80 40 3 0 4 2 21 16 40 40 ' • 575/3/60 518 632 9 3 55 2 1 8 30 I. 3 0 3 8 — -- i 30 30 — Fuse only, unshaded values indicate fuses or circuit breakers may be used Compr - Compressor LRA — Locked Rotor Amps FLA — Full Load Amps MOCP — Maximum Overcurrent Protection Hp — Nominal Horsepower RLA — Rated Load Amps 11 • YYY —> 50DP016 —1- I FACTORY- • VOLTS/PH/H2 VOLTAGE OUTDOOR INDOOR COMPR INSTALLED FAN MOTOR FAN MOTOR HEATERPOWER SUPPLY" l Min 1 MOCPt Min Max RLA LRA Qty I FLA Hp I FLA FLA Kw A kts (amps) ——E — 105 125 208-230/3/60 187 253 61 6 266 2 6 6 3 10 4 156-180 56-69 210-240 220-225 i 117-135 42-52 165-185 150-175 -- 1 I -I 72- 62 __I 26-31 f - 105-120__ . 125 _ — — 55 60 460/3/60 414 508 32 120 2 33 3 4 7 66 51 90 90 96 73 130 125 1 39 _j 30 55 I 60 575/3/60 518 632 25 6 96 i 2 2 6 —I 3 1 3 8 — — 50 45 Compr — Compressor 'Power Exhaust Accessory FLA is 4 6A @ 208-230 volts and 2 3A @ FLA — Full Load Amps 460 volts Unit Min Ckt Amps and MOCP values are unchanged Hp — Nominal Horsepower LRA — Locked Rotor Amps tFuse only MOCP — Maximum Overcurrent Protection ALA — Rated Load Amps ((.: ���))LI�L.Lf �����Ic Base unit operating sequence ALL UNITS — Upon a fall in room temperature, heating Cooling — Power on and thermostat assembly set at contact no 1 in the thermostat closes,energizing the heat- COOL and desired temperature Fan switch set at AUTO. ing contactor to bring on first-stage heat. Fan contactor is position. energized, indoor fan starts and runs Upon a rise in room temperature, cooling contact no. 1 UNITS WITH TWO-STAGE HEAT — Upon a further fall in the thermostat closes, energizing the first-stage cooling in room temperature, heating contact no 2 in the thermo- contactor and the indoor fan contactor. The first-stage stat closes energizing the second-stage heating contactor, compressor,outdoor fan motor and indoor fan motor start and second-stage electric heat operates and run Air circulation — Unit power on. Control set at OFF,fan Upon a further rise in room temperature,cooling contact switch set at ON Indoor fan contactor is energized thru the no. 2 in the thermostat closes,energizing the second-stage switch on the thermostat, and the indoor fans run contin cooling contactor The second-stage compressor starts and uously. When controls are set at HEAT or COOL,opera- runs. tion is as above, except indoor fan runs continuously. If unit operation is interrupted by the low-pressure switch, Economizer operating sequence (if supplied) — Unit power on, thermostat set at COOL or AUTO ,outside air high-pressure switch or compressor line-break device enthalpy below setting of enthalpy changeover control (motor overload or overtemperature), and there is a call for cooling, the Cycle-LOCI" circuit prevents the corn- Upon a rise in room temperature,cooling contact no 1 in pressor from restarting until manual reset is accomplished the thermostat closes. Indoor fan motor starts and outside at the thermostat by turning the unit off and then on. air damper modulates to maintain mixture of outside air and All units have condenser fan cycling thermostats which return air at preset temperature. Cooling is provided with y g outside air Mechanical cooling is locked out at 55 F shut off one outdoor fan motor. This permits unit At outside air enthalpy above enthalpy changeover con- to operate down to 35 F outdoor air temperature trol setting, outdoor air damper moves to vent position Heating — Power on and thermostat assembly set at whenever fan is running. Cooling operation is as described for base unit. When heat is energized,outdoor air damper HEAT and desired temperature Fan switch set at AUTO. moves to vent position It closes when fan is not operating. position I 12 I `Y- � �119c11lC) ° �1CJ1i: Ductwork — Ductwork should be attached to the curb on Low ambient cooling operation—Units are designed to all units Interior installation may proceed before unit is set operate at outdoor temperatures down to 35 F. At ternsr - in place on roof If ductwork will be attached to unit,do not peratures below 35 F, accessory Motormastero will drill in condensate drain pan area — leaks may result. permit operation at outdoor temperatures as low as -20 F. Field power connections — Factory-installed and field- • installed electric heat allows single power entry to unit for Roof curb — All curb installations must be counterflashed both heating and cooling. Values shown for Minimum Cir- to prevent water leakage. cuit Amps and Maximum Overcurrent Protection Amps in Power supply Electrical Data apply to factory- or field-installed heaterspp Y — Electric power may be brought to unit within curb perimeter thru fittings provided in basepan. Condensate traps—Evaporator coil is draw-thru configu- Provide power supply in accordance with local codes. ration Trap (minimum 4 in. deep) must be field provided Branch circuit protection to unit must be provided by fuses prior to start-up on cooling cycle. Install plug in condensate no larger than Maximum Overcurrent Protection Amps drain on opposite side of unit from trap. shown in Electrical Data Operating limits — Cfm and other values indicated illus- trate the operating range of the equipment. Operation Control wiring — 24-volt wiring to thermostat is NEC outside these limits is not recommended Class II. r, --a O o o 0 `l 0 0 �'. � I._ Ii( (cll,, -I I(�F 111C01 c� �fll .� WilT 1lrn C r �-•._ „.4.,..__ _,. 25'Ya AIR OR T •- ?'r�'•l t• ECONOMIZER hoop Irtoa•�aos �` , \, • . FUSED DISCONNECT \\q\- a `' . +jinni i ELECTREC HEAT(FAR V. ; SIDE FROM ACCESS . PANEL) .1 ..+,�� _ �► - ROOF CJR$ •�� `��, I I \.� • '� I 1 ---=— •tf► 1. iI '� • 1 SUPPLY CONTROL `, `� A:R POWER WIRING IRING t�'� CONDENSATE DRAIN - (a0TH SIDES-MUST r,.�.:..:3' ' i;.:ki S A IM SE TRAPPED) +� S'ho �o�, . }ly. {'' rRETURN '°"' f4' AIdRl OUTDOOR AIRFLOW INDOOR AIRFLOW 13 . 1 ',��i')(>>ll« (61I �;� ) it ii!��N; , > c,,l�. 11.(, ,1'(ica�.<r lii.) , OFF HEAT A TO 4COOL ————— —— • . 0 O • — FAN '�J --- -9 ® • AUTO • • OAT L la • • CC I CL01 I-- oPs� t I TCI _ . -:1 , • CC TC2 — — -p — LPS2 HPS2 CLO2 Q b • THI AHA - --- -- • TH2 AHA CI THERMOSTAT ASSEMBLY 0 LEGEND AH ---Adjustable Heat Anticipator OPTION ECONOMIZER C —Contactor, Compressor ,,,,4_,.,_ CC —Cooling Compensator TRAN CLO —Compressor Lock-Out DM —Damper Motor • • DR —Damper Relay EC -- Enthalpy Control Fu --- Fuse HPS - High-Pressure Switch DRI DRI IFC ---- Indoor Fan Contactor •1 L —Lamp LPS —Low-PressuredAir Swimosth • MAT — Mixed Air Thermostat DR2 DR2 . j OAT —Outdoor Air Thermostat OFC —Outdoor Fan Contactor 1 irrilM • 11111 TC —Thermostat, Cooling TH —Thermostat, Heating ` DM TRAN —Transformer ❑ Terminal Block Connection40 Q Terminal (Unmarked) DR2 Co Terminal(Marked) it EC ____ _— Field Splice En • 12 Q. Splice (Marked) DR3 •41' am, --� Wire Marker I v Factory Wiring Q • Factory Splice Accessory or Optional Wiring —--— Field Control Wiring Field Power Wiring To indicate common potential only; not to represent wire 14 n o coo 0 Base unit Roof curb shall be of the same manufacture as unit and Unit shall be a one-piece air-cooled electric cooling unit and shall include an insulated panel under compressor section ill shall be mounted on a full perimeter roof curb. Standard to prevent condensation forming on the bottom. Dimen- sions shall include a manual outdoor air inlet and shall include sions shall be provided to allow for easy duct location and provisions for electric heat. connection to roof curb prior to unit placement Curb Total cooling capacity of unit shall be _Btuh or design shall comply with National Roofing Contractors Association requirements. (Accessory) • greater, and sensible capacity shall be Btuhor Economizer shall include return air (R.A ) and outside air greater at conditions of cfm evaporator air entering unit at F wet-bulb, F dry-bulb and condenser (O.A.)dampers,outdoor air filter and hood,and fully modu- entering air temperature of F dry-bulb. lating electric control system with enthalpy changeover con- trol and adjustable mixed air thermostat. Economizer Heating capacity of units shall be kw. control shall be capable of introducing up to 100%outdoor Unit compressor(s)shall be serviceable semi-hermetic or air. The control changeover from mechanical cooling to welded fully hermetic with crankcase heater(s)and suitable economizer operation shall be fully automatic thru an vibration isolators. Compressors shall be of the same adjustable enthalpy control device. (Accessory or FLOP) manufacture as unit and shall have a 5-year warranty. Alternate motor and drive assembly to provide added Coils — Indoor and outdoor coils shall be of nonferrous cfm and static pressure capability. (FLOP) construction with aluminum plate fins mechanically bonded Electric resistance heaters shall be available in 3 selec- to seamless copper tubes with all joints brazed. tions (low, medium, high heat-to-cool ratio) and shall have Fans and motors — Indoor blowers shall be forward- open wire nichrome elements with all necessary safety and curved, centrifugal, belt-driven type capable of delivering operating controls. Heaters shall be UL listed and approved cfm at in. wg external static pressure Motor for use when factory installed. Units with factory-installed pulley shall be adjustable pitch. Indoor blower motor shall heat shall have single power entry by terminal blocks suit- be hp with permanently lubricated bearings.Outdoor able for copper or aluminum wires (Accessory or FLOP) fans shall be of the propeller type, with direct-driven per- Remote control panel — The panel shall provide central manently lubricated motor of hp or less. Outdoor control of heating, cooling, indoor fan and outdoor air fans shall discharge upward damper Indicator lights for unit functions shall be provided. Unit cabinet shall be constructed of galvanized steel, (Accessory) bonderized and coated with a baked enamel finish Cabinet Thermostat assembly shall provide staged heating and IDinterior shall be insulated with 1-in. thick neoprene-coated fiberglass. Cabinet panels shall be easily removable for cooling,automatic changeover and fan control. (Accessory) service to all operating components.A condensate drain for Head pressure control — A solid state outdoor air fan the indoor coil shall be provided. speed control to permit unit to operate down to-20 F shall be provided. (Accessory) Controls — The cooling system shall be protected with high pressurestat,low pressurestats,loss-of-charge protec- damper — An automatic damper to relieve positive tion, indoor coil freezestats, and current and temperature building pressure shall be provided. (Accessory) sensitive overload devices. Time Guard®circuit to prevent compressor short cycling Each of these devices shall be wired thru the Cycle-LOC' as a result of a rapid change in thermostat setting. Also, circuit to prevent compressor restart until reset at the automatically prevents compressor restart at least 5 min- thermostat (or unit circuit breaker). utes after shutdown (Accessory) Unit electrical connections—Unit with factory-installed Power exhaust to be used only in conjunction with econo- electric heat shall have single-point power connection to a mizer,exhausts up to 75%of return air at 0.1 S.P.Eliminates terminal block. Cabinet shall contain suitable openings for overpressurization of the building. (Accessory) routing of all utility connections. The base unit shall con- Two-position damper — Allowing remote closure of 25% taro a terminal strip in the control compartment to allow for outside air opening when unit shuts down shall be pro- terminal-to-terminal connection of room thermostat and vided. (Accessory) field-installed accessories Variable volume (50DP016) to match unit capacity with Maximum dimensions — Width in., depth changing load requirements. Used only with alternate drive in , height inches pulley and economizer Unit operation is programmed by a Accessories and options control panel located in the main control box. (FLOP) The following factory-installed options (FLOP) or field- installed accessories (accessory) shall be provided • 15 • e • Number One Air Conditioning ker Carrier 411110 uliecorwrala� Cane,Parkway•Syracuse N V 13121 Manufacturer reserves the right to discontinue,or change at any time,specifications or designs without notice and without incurring obligations. Book 1 4 Form 50DP-3P Supersedes 50DP-2P Printed in USA 10-80 PC 111 Catalog No 525-077 Tab 1b 6b