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Carrier 48HC - page 1
48HC Single P ackag e Rooftop Gas Heating /Elec tric Cool ing U nit with Pur on r (R - - - 410A) Refrigera nt Siz es: 17, 20, 24, 28 Installation Instructions NOTE : Read the entire instru ction manual before star ting the ins tallation T ABLE OF CONTENTS SAFET Y CONSIDE RA TIONS 2 .................... INS T ALLA TION 9 ............................ ...
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Carrier 48HC - page 2
2 Field Connec tions 39 .......................... Sp ace T emper ature (S PT) S enso rs 40 ............ Indoor Air Quality (CO 2 )S e n s o r 4 0 ............. Outdoor Air Qua lity Sens or 41 ................. Space Relativ e Humidity S ensor o r Humidis tat 41 .. Smoke Detec tor/Fire Shutdown (FSD ) 42 ......... Connect ing Discrete Inputs 42 ... ...
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Carrier 48HC - page 3
3 C10896 Fig. 1 - - Unit Dimensional Drawing – 17 Size Unit 48HC ...
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Carrier 48HC - page 4
4 C10897 Fig. 1 - - Unit Dimensional Drawing – 17 Siz e Unit (cont.) 48HC ...
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Carrier 48HC - page 5
5 C10892 Fig. 2 - - Unit Dimensional Drawing – 20 and 24 Size Units 48HC ...
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Carrier 48HC - page 6
6 C10893 Fig. 2 - - Unit Dimensional Drawing – 20 and 24 Size Units (cont.) 48HC ...
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Carrier 48HC - page 7
7 C10900 Fig. 3 - - Unit Dimensional Drawing – 28 Size Unit 48HC ...
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Carrier 48HC - page 8
8 C10901 Fig. 3 - - Unit Dimensional Drawing – 28 Siz e Unit (cont.) 48HC ...
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Carrier 48HC - page 9
9 INST ALLA TION Jobsite Survey Complete th e follow ing check s befo re installatio n. 1. Consult local buildi ng codes a nd the NEC (National Electrical Code) AN SI/N FP A 70 for special installa- tion requ irements. 2. Determ ine unit loc ation (from proje ct plans) or selec t unit loca tion. 3. Chec k for possible overhea d obstructi ons which ...
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Carrier 48HC - page 10
10 Ste p 2 — Plan for Se quence o f Unit Inst allati on The support me thod used for thi s unit w il l dict ate different sequence s for the steps of unit insta llat ion. For e xample , on curb- - mounted units, some acce sso ries must be installed on the uni t before th e unit is p laced on the curb. Review the follow ing fo r recommended s eque ...
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Carrier 48HC - page 11
11 C10954 Fig. 6 - - Roof Curb D etai ls – 17 Size Unit 48HC ...
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Carrier 48HC - page 12
12 C10955 Fig. 7 - - Roof Curb D etai ls – 20 and 24 S iz e Units 48HC ...
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Carrier 48HC - page 13
13 C10956 Fig. 8 - - Roof Curb D etai ls – 28 Size Unit 48HC ...
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Carrier 48HC - page 14
14 A-B 0.25” (6) B-C 0.5” (12) A-C 0.5” (12) MAXIMUM ALL OWABLE DIFFERENCE IN. (MM) A B C C10628 Fig. 9 - - Unit L eveling T olerances Ste p 5 — Field Fabric ate D uctw ork Cabinet re turn-ai r static pressure (a negat ive condition) shall not exceed 0.5 in. wg (87 Pa) with economizer or without ec onomize r . For vertica l duct ed appli ca ...
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Carrier 48HC - page 15
15 P o s i t i o n i n go nC u r b— Po sition unit on ro of curb s o that the followin g clearances are maintained : 1 / 4 in. (6 mm) clearance betw een the ro of curb a nd the ba se ra il inside t he right and le ft, 1 / 2 in. (12 mm) clearance betw een the roof cu rb and the bas e rail insid e the fron t and back . This will resu lt in the dist ...
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Carrier 48HC - page 16
16 T o ass emble the outside air hood: 1. Remove hood top panel from shipping position on unit end. 2. Install four angles to the upper end pane l using the screws provided. 3. Apply seal strip to m ating fl anges on the side plat es of the hood (see Fig. 14). A pply Seal Strips to the back of these flanges Apply Seal Strip to the front of this fla ...
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Carrier 48HC - page 17
17 T able 2 – T ypical 3 / 4 - - i n NPT Fi el d Suppli ed P i ping P ar ts Item Qty CPN Descript ion 1 1 C A15RA201 90 Deg Street Elbow 2 1 C A01CA226 5 Inch Long Ni pple 3 1 C A85RA201 Ground - - - Join t Unio n 4 1 C A01CA218 3 Inch Long Ni pple 5 1 C A05RA201 90 Deg Elbow 6 1 C A01CA250 12 Inc h Long Nipple 7 1 C A05RA201 90 Deg Elbow 8 1 C A ...
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Carrier 48HC - page 18
18 Fa cto ry - - Opti on Thr u - - Base Connec ti ons — Electrica l Conn ection s: Knockouts a re loca ted in the control box area . Rem ove t he appropria te size knoc kout for high vol tage conne ction. Use the fie ld supplied connector depe nding on wiring or c onduit being utilized. Remove t he 7 / 8 - - i n (22m m) knockout and appropri ate ...
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Carrier 48HC - page 19
19 Ste p 1 1 — Inst all Exte rna l Condens ate T ra p and Line The uni t has one 3 / 4 -in. c ondensate dra in connec tion on the end of the condensat e pan (see Fig. 21). See Figs. 1, 2 and 3, item “E”, in the view labeled “BACK (HORIZ ONT AL DISC HARGE) ” fo r the l oca t ion o f the condensat e drain c onnecti on. CONDENSA TE DRAIN CON ...
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Carrier 48HC - page 20
20 FIRE H AZARD Failure t o follow this warning c ould result in intermittent op eration or un satis factory perfo rmance. Do not connect al uminum wire between disconnect switch and a ir condit ioning unit . Use only copper w i r e .( S e eF i g .2 4 . ) ! W ARNING COPPER WIRE ONLY ELECTRIC DISCONNECT SWITCH ALUMINUM WIRE A93033 Fig. 24 - - Discon ...
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Carrier 48HC - page 21
21 T wo types of convenie nce out lets are of fere d on 48HC models: Non - - unit powered a nd unit - - powere d. Both types provide a 125 - - volt GFCI (ground - - faul t circui t - - int errupte r) duplex recept acle rated at 15 - - A behind a hinged access cover , loc ated on the corne r panel of the unit. See Fig. 26 . Convenience Outlet Electr ...
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Carrier 48HC - page 22
22 2.0 50HE501288 NOTICE/AVIS Convenience Outlet Utilization Maximum Intermittent Use 15 - Amps Maximum Continuous Use 8 - Amps Observe a 50% limit on the circuit Loading above 8 - Amps Utilisation de la prise utilitaire Usage intermittent maximum 15 - Amps Usage continu maximum 8 - Amps Observez une limite de 50% sur le circuit Chargement au-dessu ...
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Carrier 48HC - page 23
23 C W2 G W1 R Y1 T ypical Thermostat Corrections O/B/ Y2 (see Note) Note: T ypical multi-function marking. Follow manufacturer’s configuration instructions to select Y2. Field Wiring Central T erminal Board W1 Y2 Y1 R W2 G C X W1 Y2 Y1 R W2 G C X T–ST A T See Caution UNIT DAMAG E HAZARD Failure t o follow this ca ution ma y cause a short c irc ...
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Carrier 48HC - page 24
24 Humidi- - Mi Zer R Con tr ol Conne ct ions Humi di - - Mi Zer – Spac e RH Contro ll er — NOTE : The Humidi- - MiZer is a factory in stalled optio n. The Humidi- - MiZer dehumidif ication sys tem requir es a field- - supplied an d - - ins talled space relative hu midity contro l device. This device may be a s eparate hu midistat control (cont ...
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Carrier 48HC - page 25
25 C11139 Fig. 34 - - T ypical H umidi- - Mi Zer R Adap tive Deh umid ificatio n Sy stem Hum idis tat W iring Rc Rh W1 G Y2 C O/W2/B Y1 OAT RRS SRTN HUM D1 D2 V+ Vg X* C G W2 W1 Y2 Y1 R EDGE Pro THERMIDISTAT Unit CTB THERMOSTAT *Connection not required. Humidi-MiZer™ FIOP C09298 Fig. 35 - - T ypical Rooftop Unit with Humidi - - MiZe r Adaptive De ...
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Carrier 48HC - page 26
26 PremierLi nk t (Factory - - O pti on) C08199 Fig. 36 - - Premier Link Contr olle r The Premier Link contro ller (see Fig . 36) is compatible with Car rier Comfo rt Netwo rk r (C CN) devices . This contro l is designed to allow us ers the access and ability to change fact ory- - defi ned setti ngs, thus expandi ng the function of t he standa rd u ...
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Carrier 48HC - page 27
27 C11140 Fig. 38 - - PremierL ink W iring Sch ematic 48HC ...
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Carrier 48HC - page 28
28 C11141 Fig. 39 - - PremierL ink W iring Sch ematic wit h Humid i - - MiZer R 48HC ...
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Carrier 48HC - page 29
29 Supply Air T em per ature (SA T) Se nsor — On FIOP- - e quipped 48HC unit, the unit is supplied with a supply- - a ir tem perature (SA T ) sensor (33ZCSENSA T). This sensor is a tubula r probe type, approx 6- - inc hes (12.7 mm) in leng th. It is a n ominal 10- - k ohm thermis tor . The SA T is factory - - wired. The SA T probe is mounted in t ...
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Carrier 48HC - page 30
30 T abl e 5 – Space Se nsor Mo de TB3 TERMINA L FIELD C ONNEC TION INPU T SIG NAL 1 T 5 5 --- S E N / T 5 6 --- S E N An alog (10k th ermi stor) 2 RMTOC C Discrete, 24VAC 3 T 5 5 --- S E N / T 5 6 --- S E N An alog (10k th ermi stor) 4 CMPS AF E Discrete, 24VAC 5 T56 - - - SE T An alog (10k th ermi stor) 6 FSD Discrete, 24VAC 7 L OOP - - - PW R ...
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Carrier 48HC - page 31
31 Spac e Se nsors — The Premi erLi nk controll er is fact ory- - shipped c onfigured for Space Sensor Mode. A Carrier T - - 55 or T- - 56 s pac e sensor must be us ed. T - - 55 space te mperat ure s ensor provides a signal of spac e te mperat ure to t he PremierL ink control. T - - 56 provides same space t empera ture signal plus it al lows for ...
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Carrier 48HC - page 32
32 Economizer Contr ols Indoor Ai r Qua li ty (CO 2 )S e n s o r— The indoor air quality sensor access ory monitors space carbon di oxide (CO 2 ) levels. This info rmation is used to monito r IAQ lev els. Several typ es of s ensor s are available, for w all mounting in the s pace or in return du ct, with and without LCD display , and i n combina ...
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Carrier 48HC - page 33
33 J5-2 J5-3 13 11 TB3 TB3 OAQ Sensor PL 24 V AC 4-20mA SIG COM C11157 Fig. 49 - - O utdoor C O 2 Se nsor Conne ct io ns Spac e Rel ati ve Hum idi ty Senso r or Hum idi stat Conne cti ons — Spac e Re lat iv e Humi dit y Senso r co nnec tio ns: The access ory s pace relative humidity sens or (33ZCS ENS RH-0 1) is ins talled on an interior wall to ...
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Carrier 48HC - page 34
34 Smoke De te cto r/ Fi re Shutdown (FSD) — This fun ction is available only w hen Premier Link is conf igured fo r (Space) S enso r Mode. The unit is factory- - wired f or Premier Link FS D operation wh en Premier Link is factory- - installed . On 48HC units equipped with factory - - installe d Smoke Detector (s), th e smoke d etector contr oll ...
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Carrier 48HC - page 35
35 CCN Comm unic ati on Bus — The Premie rLink cont rolle r connects to the bus in a dai sy chain arrangement. Nega tive pins on each component must be con nected to resp ective n egative pins , an d likewis e, positive pins o n each component must be connected to res pective po sitive pin s. The controller signal pins must be wired to the signal ...
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Carrier 48HC - page 36
36 R TU O pen Contr ol Syste m The R TU Open control is fa ctory - - mounted in the 48HC unit’ s main c ontrol box, to the right of the CTB. See Fig. 37. Factory wiri ng is comple ted t hrough harnesses connected to th e CTB. Field connections for R TU Open sensors w ill be m ade at the Phoeni x connect ors on the R T U Open board. The fact ory- ...
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Carrier 48HC - page 37
37 C11142 Fig. 58 - - R TU Open System Control Wiring Diagram 48HC ...
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Carrier 48HC - page 38
38 C11143 Fig. 59 - - R TU Open System Control Wiring Diagram with H umidi- - Mi Zer R 48HC ...
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Carrier 48HC - page 39
39 T abl e 9 – RTU Ope n Control l er Inputs a nd Out puts POINT NAME BACne t OBJ ECT NAM E TYPE OF I /O CON NECTI ON PIN NUM BE R( S) DEDICATE D INPUTS Spa ce T emp / Z one T emp zone_tem p AI (10K Th ermist or) J 2 0 --- 1 , 2 Suppl y Air T empera ture sa_ temp AI (10K T hermistor) J 2 --- 1 , 2 Ou tdoor Air T e mpera ture oa_temp AI (10K Th er ...
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Carrier 48HC - page 40
40 to the R TU Open . Conn ect to the wires to the removable Phoenix conne ctors and then re connect the c onnectors to the board. Sp ace T emperatu re ( SPT) S ens ors — There are two t ypes of SPT sensors avai lable from Ca rrier , resistive i nput non-com munica ting (T55, T 56, and T 59) an d R net c omm uni c at ing ( SPS, SPPL , SPP , a nd ...
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Carrier 48HC - page 41
41 isolate d 24 vac power source to the sensor and t o connect the sensor to the cont rol board te rminal s. T o connect the sens or to the contro l, identify the positive (4 to 20 mA) and ground (SIG COM) terminal s on the sensor . See Fig. 46. Connect the 4- - 20 mA te rmina l to R TU Open ter minal J4- - 2 and connect the SIG COM terminal to R T ...
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Carrier 48HC - page 42
42 Relative Humidity Sensor (Polarized Male Connector ) J4-1 or J4-4 + 24 VDC Supply Voltage J4-2 or J4-5 (-) 4 to 20 mA Cu rrent Loop Output to RTU-OPEN 4-20 VAC GND 0-5V mA or or VDC 0 -10V SPAN ZERO C10839 Fig. 66 - - Duct Relative H umidity Sensor T ypical Wiring Humidistat: The accesso ry humidistat p rovides the R TU Open in sight to th e rel ...
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Carrier 48HC - page 43
43 Com munic atio n W iring - - Pr otocols Genera l — Protocols are t he c ommuni cati on language s spoken by control devi ces. The m ain purpose of a protoc ol i s to communi cate informatio n in the most eff icient method pos sible. D iff erent pro tocols ex ist to prov ide dif ferent kinds of informat ion for different a pplica tions. In the ...
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Carrier 48HC - page 44
44 Loca l Acces s — BACvi ew 6 H andhe ld: The BAC view 6 is a keypad/ display interface us ed to conn ect to the R TU Open to access the control i nformat ion, rea d sensor values, a nd test the R TU, see Fig. 70. This is an accessor y interface that does n ot come with the R TU O pen contro ller and can only be us ed at the unit. Con nect the B ...
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Carrier 48HC - page 45
45 T able 10 – LEDs The LE Ds on the R T U Open Control Board (see Fig. 57) show the sta tus of certa in functi ons: If th is L ED is o n... Statu s is... Power R TU Open has power Rx RTU O pen is receivi ng data f rom the network segm ent Tx RTU O pen is tra nsmittin g data ov er the netw ork segmen t DO# The digital output is active The Run and ...
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Carrier 48HC - page 46
46 GRA BLK RED – 4-20 Main + VDC Out – 4-20 Main Out + 24-36 VDC In LOW GND 24V 7 PL6-1 (24- V) PL6-4 (COM) Outside Air Enthalpy Switch Return Air Enthalpy Sensor CTB ECON (P’LINK: to J4-2) or (RTU Open: to J2-6) C11161 Fi g. 72 - - O utside and Re tur n Air Ent halpy Senso r Wi r i ng T o wire the re turn air e nthalpy sensor , pe rform the ...
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Carrier 48HC - page 47
47 T o install the r eturn air sensor samp li ng tu be: 1. Remove t he tube from its shipping loca tion. 2. Open the unit end to acces s the retur n air s ensor (loc- ated on righ t - - hand partitio n) 3. Orient the tube’ s sampling h oles into the return air flow di rection. For vertical application, positio n the samplin g holes on the bottom ...
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Carrier 48HC - page 48
48 T abl e 1 1 - - Uni t W i re/F use or H ACR Breake r Siz ing Dat a (cont ) UNIT NOM. V --- P h --- H z IFM TYPE COMB USTIO N F AN MOTOR POWE R EXHAUS T w/ PWRD C .O. NO P .E . w/ P .E . (pwrd fr/ unit) FLA FLA MC A FUSE o r HACR BRKR DISC. SIZE MCA FUSE o r HACR BRKR DISC. SIZE FLA LRA FL A LRA 48HC * D17 208/230 - - - 3 - - - 60 STD 0.52 5.9 73 ...
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Carrier 48HC - page 49
49 Legend and Notes for T able 1 1 LEG END: BRKR - - - C ircuit breaker CO - - - C onveni ence out let DISC - - - Discon ne ct FLA - - - Full loa d a mps LRA - - - Locke d roto r amps MCA - - - Minimu m circuit a mps P E --- P o w e r e x h a u s t PWRD CO - - - Pow ered convenie nt outlet UNP WR C O - - - Un po wer ed co nv enie nt ou tlet NOT ES ...
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Carrier 48HC - page 50
50 Economizer 2 Position Damper Unit Without Economizer or 2 Position Damper C10645 Fig. 76 - - Ec onoMi$er t IV Wir ing Ste p 13 — Adjus t Fac tor y- - Installe d Optio ns Eco noM i$e r IV O c cupanc y Swi tc h — Refer to Fig. 76 for general EconoMi$er IV wiring. Externa l occ upancy cont rol is mana ged through a conn ection on the Centr al T ...
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Carrier 48HC - page 51
51 48HC ...
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Carrier 48HC - page 52
52 Copyright 2011 Carrier Corp. D 7310 W . Morris St. D In dianapolis, IN 46231 Printed in U.S .A. Edition Date: 04/11 Manufacturer reser ves the right to change , at any time, specifications and d esigns without notice and without oblig ations. Catal og No: 48HC - - - 11SI Replaces : 48HC - - - 08SI 48HC ...
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