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Carrier 38MVQ - page 1
38MVC/40MVC 38MVQ/40MVQ Comfort t S e r i e s H i g h --- W a l l D u c t --- F r e e S p l i t S y s t e m Sizes 009 - - - 024 Service Manual T ABLE OF CONTENTS P AGE SAFETY CONSIDERA TIONS 1 ......................... ST ANDARD FEA TURES AND ACCESSORIES 2 ........... SPECIFI CA TIONS - - COOLING ONL Y 3 .................. SPECIFI CA TIONS - - HEA ...
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Carrier 38MVQ - page 2
2 MODEL NUMBER NOMENCLA T URE OUTD OOR UNIT 38 MVC 3 - - - 01 --- 018 A i r --- C o o l e d C o n d e n s e r Unit T y pe MVC --- C o o l i n g O n l y MVQ --- H e a t P u m p Vo lt a ge 1 --- 1 1 5 --- 1 --- 6 0 3 - - - 208/230 - - - 1 - - - 60 Nominal C apaci ty 009 --- 3 / 4 T o n 012 --- 1 T o n 018 --- 1 --- 1 / 2 T o n 024 --- 2 T o n s INDOO ...
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Carrier 38MVQ - page 3
3 ST ANDARD FEA TURES AND ACCESSORIES Ease Of Installation Mount ing Bra cket s S Low V olta ge Cont rol s S Comfo rt F eature s Microprocessor C ontrols S Wireles s Remot e Control S Automa tic Air Sweep S Air Direct ion Control S Auto R estart Function S Cold B low Pr otection On Hea t Pumps S Tu r b o M o d e O n S i z e s 9 K a n d 1 2 K S Auto ...
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Carrier 38MVQ - page 4
4 SP ECIF ICA TIONS - - COOLIN G ONL Y UNITS System System Model Number 5 3 M V C 0 0 9 --- --- --- 1 5 3 M V C 0 1 2 --- --- --- 1 5 3 M V C 0 1 2 --- --- --- 3 5 3 M V C 0 1 8 --- --- --- 3 System Voltag e 115 V 115 V 208/230 208/230 Cont ro l V ol ta ge 0 --- 1 2 P u l s e D C 0 --- 1 2 P u l s e D C 0 --- 1 2 P u l s e D C Puls e DC Ca pacity ( ...
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Carrier 38MVQ - page 5
5 SP ECIF ICA TIONS - - HEA T PUMP UNITS System System Model Number 5 3 M V Q 0 0 9 --- --- --- 1 5 3 M V Q 0 1 2 --- --- --- 1 5 3 M V Q 0 1 2 --- --- --- 3 5 3 M V Q 0 1 8 --- --- --- 3 System Voltag e 115 V 115 V 208/230 208/230 Cont ro l V ol ta ge 0 --- 1 2 P u l s e D C 0 --- 1 2 P u l s e D C 0 --- 1 2 P u l s e D C Puls e DC Ca pacity (B tu ...
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Carrier 38MVQ - page 6
6 DIMENSIONS - - INDOOR A07336 Mod el Siz e W in. ( mm) H in. ( mm) D in. ( mm) Wei ght l b (kg) 9K 32.09 (815) 11.02 (280) 7.68 (195) 24. 2 (1 1) 12K 35.67 (906) 11.26 (286) 9.25 (235) 33.0 (15) 18K 49.21 (1250) 12.80 (325) 9.06 (230) 55.0 (25) 24K 49.21 (1250) 12.80 (325) 9.06 (230) 55.0 (25) DIMENSIONS - - OUTDOOR L1 L2 35 W H Air Flow L3 A07337 ...
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Carrier 38MVQ - page 7
7 CLEARANCES - - INDOOR 6 " (0.15m ) min. 5 " (0.13m) min. 6' 5 " (0.13m) min. (1.8m) A07891 Fig. 2 – Indoor unit cl ear anc e CLEARANCES - - O UTDOOR A D B Air-outlet Air-inlet C E A07894 UNIT 9k and 12k in. (m m) 18k and 24k in. ( mm) A 24 (610) 24 (610) B 24 (610) 36 (914) C 24 (610) 24 (610) D 4 (102) 12 (305) E 12 (305) 1 ...
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Carrier 38MVQ - page 8
8 SYS TEM OPERA TING ENVELOPE 53MVC/MVQ Sy stem Operating En velope Chart 40 50 60 70 80 90 100 110 120 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 Outdoor Temperature (º F) Indoor Temperature (ºF) 0 5 10 15 20 25 30 35 40 45 50 55 60 - 4 0 - 3 5 - 3 0 - 2 5 - 2 0 - 1 5 - 1 0 - 5 0 5 1 01 52 02 53 03 54 04 55 05 56 0 Outdoor Temperature ...
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Carrier 38MVQ - page 9
9 WIRING The m ai n powe r i s suppl ie d t o the outdoor unit. The f ie l d suppl i ed c onne ct i ng ca ble from the outdoor unit to i ndoor unit consi s ts of four wir e s a nd pr ovide s t he power f or t he indoor uni t a s we ll a s the c ommunic at i on s igna l be twe e n the outdoor uni t a nd indoor unit . V olta ge dr op on the c onnec t ...
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Carrier 38MVQ - page 10
10 WIRING DIAGRAMS Fig. 6 – Wi r ing Di agr am 38MVC 009 - - - - - - 1 W/ 40MVC009- - - - - - 1 38/40MV C, MVQ ...
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Carrier 38MVQ - page 11
11 WIRING DI AGRAMS (CONT .) Fig. 7 – Wi r ing Di agr am 38MVC 012 - - - - - - 1 W/ 40MVC012- - - - - - 1 38/40MV C, MVQ ...
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Carrier 38MVQ - page 12
12 WIRING DI AGRAMS (CONT .) Fig. 8 – Wi r ing Di agr am 38MVC 012 - - - - - - 3 W/ 40MVC012- - - - - - 3 38/40MV C, MVQ ...
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Carrier 38MVQ - page 13
13 WIRING DI AGRAMS (CONT .) Fig. 9 – Wi r ing Di agr am 38MVC 018 - - - - - - 3 W/ 40MVC018- - - - - - 3 38/40MV C, MVQ ...
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Carrier 38MVQ - page 14
14 WIRING DI AGRAMS (CONT .) Fig. 10 – Wi r ing Di agr am 38MVQ 009 - - - - - -1 W/ 40MVQ 009 - - - - - - 1 38/40MV C, MVQ ...
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Carrier 38MVQ - page 15
15 WIRING DI AGRAMS (CONT .) Fig. 1 1 – W ir i ng Diagr am 38MVQ012- - - - - -1 W/ 40MVQ 012 - - - - - -1 38/40MV C, MVQ ...
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Carrier 38MVQ - page 16
16 WIRING DI AGRAMS (CONT .) Fig. 12 – Wi r ing Di agr am 38MVQ 012 - - - - - -3 W/ 40MVQ 012 - - - - - - 3 38/40MV C, MVQ ...
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Carrier 38MVQ - page 17
17 REFRIGERA TION CYCLE DIAGRAM CAPILL A RY TUBE HEA T EXCHANGER (CONDENSER) HEA T EXCHANGER (EV APORA TOR) FIELD PIPING COMPRESSOR FL ARE CONNECTION SERVICE V AL VE SERVICE V AL VE W/GUAGE PORT TWO PHASE LIQUID LINE SUCTION LINE FIELD PIPING FL ARE CONNECTION A08104 Fig. 13 – Coolin g CAPILL A RY TUBE HEA T EXCHANGER (CONDENSER) HEA T EXCHANGER ...
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Carrier 38MVQ - page 18
18 REFRIGERANT LINES Gen eral refrig eran t line sizin g: 1. The 38MVC/ MVQ unit s a re s hi pped wit h a ful l char ge of R410A ref r ige r ant . A ll c har ges , li ne s iz ing, and ca pa c ities ar e bas e d on runs of 25 f t ( 7.6 m). For runs ove r 25 f t (7. 6 m) , cons ult long- - li ne se c ti on on thi s page f or proper c ha r ge adju stm ...
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Carrier 38MVQ - page 19
19 SYSTEM EV ACUA TI ON AND CHARGING UNIT DAMAGE HAZARD Failu re to fo llow thi s cautio n m ay result in eq uip men t dam age or i mpr ope r oper a ti on. Ne ver us e the s ys te m com pre s sor a s a vac uum pump. CAUTION ! Ref r ige ra nt tubes a nd indoor coil s houl d be e va cua te d usi ng the re c omme nde d dee p va cuum me thod of 500 mic ...
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Carrier 38MVQ - page 20
20 CONTROL SYSTEM The 40M VC/ MVQ uni t i s equippe d wi th a mic ropr oc e ss or c ont rol to pe rf orm two func t ions : 1. Provi de s af e ty for t he sys te m 2. Contr ol the s ys te m and provi de opti mum le ve ls of c omf ort a nd ef fic ie nc y The m ai n mi cr opr oce s sor is loc ate d on the cont rol boar d of t he f a n coi l unit ( out ...
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Carrier 38MVQ - page 21
21 Ind oo r Co il F reeze Protectio n The indoor c oil c a n fr eeze due to any of th e fo llowin g : S Low sys t em c ha r ge S Reduc e d indoor ai rf l ow S Restricted refrig erant flo w S Low ambi ent t e mper a tur e ( outdoor ) S Low loa d (i ndoor ) In c ool ing mode, the t her mi st or loc at e d on a ret ur n bend of t he indoor c oi l moni ...
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Carrier 38MVQ - page 22
22 MODES OF OPERA TION The uni t s ha ve 5 main ope rat ing m odes : 1. Fan O nly 2. Cooli ng 3. He at i ng ( hea t pumps onl y) 4. Auto 5. D ehum idificatio n (Dry ) The unit s ha ve 2 othe r modes (ma nua l oper at i on) t ha t ar e ope ra te d in unique s it ua ti ons : 1. A uto F orced Mo d e (Em er g ency ) 2. T e st M ode Fan Mode Only In thi ...
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Carrier 38MVQ - page 23
23 Auto Fan Wh en th e fan speed is set to A uto , the fan will ru n at either th e me dium or low spee d bas ed on the dif f er e nce be t wee n the room te mpe r at ure a nd the s et poi nt te mpe r at ure a s shown below : Room temp. up Room temp. down T- T s 0 Med. Speed Low . Speed 3.6°F T = Room T emperature T s = Set Point T emperature A081 ...
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Carrier 38MVQ - page 24
24 Dry (Dehu mid ificatio n) Mode Wh en mo re h um idity co ntro l is d esired, the Dry setting can be se l ec t ed. Lowe r humidi t y is a c hie ved w hen the mic r oproc e ss or adj us ts the indoor f an s peed a nd compr es sor c yc li ng by compa ri ng the r oom te mper a tur e ( T) and the s et poi nt te mpe ra t ure ( TS). Th ere are two d if ...
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Carrier 38MVQ - page 25
25 TROUBLESHOOTING This s e ct i on pr ovide s the r e quir e d flow cha r ts t o troubl e shoot pr oble ms t ha t may ar i se . NOTE : Inf or mati on r equir ed i n the diagnos es can be found ei the r on the wi r ing di agram s or in the appendi x. Requi re d Tool s: The f ol lowi ng t ools are nee de d when di a gnosi ng t he uni ts : S Dig ital ...
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Carrier 38MVQ - page 26
26 CHAR T 1 - - INDOOR F AN SP EED OUT OF CONTROL Reset main power and restar t syste m using remote . Proble m persi sts? Replace indoor fan motor No further ac tion is requi red No Yes Check IFM output and input on indoor board. Values good? Yes Check motor connection. Connection good? No Fix connection Yes No Replace indoor board Reset main powe ...
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Carrier 38MVQ - page 27
27 CHAR T 2 - - TEMPERA TURE SENSOR Reset main power and restar t syste m using remote . Proble m persi sts? Appendix 6 No further ac tion is requi red No Yes Check input and output on indoor or outdoor board. Yes Check sensor connec tor at ID or OD boa rd Connection good? No Fix connection Yes No Replace board Check sensor resistance. No Yes Yes N ...
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Carrier 38MVQ - page 28
28 CHAR T 3 - - COMPRESSOR O VERCURRENT PROTECTION Is unit running in outdoor ambient higher than 125 °F? Beyond operating range Outdoo r coil cl ean? Clean coil. Problem p ersists? Problem solved Check connections fro m OD board. Corrosion, or high resistance Outdoo r fan Ok? Connect gauges to unit. pres sures ok ? Chec k amp draw to compresso r? ...
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Carrier 38MVQ - page 29
29 CHAR T 4 - - I NDOOR UNIT COMMUNICA TION ERROR SIZE 9K AND 12K Reset main power and restar t system using rem ote. Problem persists? . No further action is require d No Yes Measure Volts DC on outdoor TB betw een 1 & 3. Ok?** Yes Check the wires and connections between Indoor and outdoor units* No Fix connection or replace wiring No Yes Repl ...
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Carrier 38MVQ - page 30
30 CHAR T 5 - - OUTDOOR UNIT PROTECTS Suction and head equal? Outdoo r coil clean? Clean coil. Problem persists? Check sensors. Flow Chart #2 Connect gauges to unit. Pressure s ok? Check compressor Normal suction, high head? Non condensables in sys. Pump down and recharge unit High head, high suction? Unit is overcharged. Reclaim charge and weigh i ...
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Carrier 38MVQ - page 31
31 CHAR T 6 - - INDOOR UNIT COMMUNI CA TION ERROR SIZ E 18K AND 24K * Make sure wires are c onnected per connection diagrams i.e. L1 to L1 and L2 to L2. Failing to do that will result in a communication error. ** T here is a 2 to 3 min ute wi ndo w to tak e meas urem ents b efore t he dia gnos tic lig ht is o n agai n. Reset main power and restar t ...
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Carrier 38MVQ - page 32
32 CHAR T 7 - - UNIT NOT RUNNING, N O DIAGNOSTIC CODE Yes Use auto forced function. Unit ru ns? Reset re mote and resta rt the unit. Is unit running? Problem solved Check batteries. OK? Replace battery Go to chart #13 Reset circ uit breaker. Is unit running? Yes Problem solved Is the re pow er to ou tdoor unit? Yes Check fuse on outdoor boar d. Ok? ...
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Carrier 38MVQ - page 33
33 CHAR T 8 - - UNIT NOT RUNNING OPTIMALL Y Suction and head equal? Outdoo r coil clean? Clean coil. Problem persists? Indoor filter clean? Clean f ilter. Problem persists? Check indoor fan moto r Connect gauges to unit. Pressure s ok? Replace indoor fan moto r. Check compressor Normal suction, high head? High head, high suction? Unit is overcharge ...
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Carrier 38MVQ - page 34
34 CHAR T 9 - - UNIT NOT RUNNING OPTIMALL Y (HP IN HEA TING)* Visuall y chec k outdoor Unit for ice blockage. ** Check reversing valve. Go to flow chart #12 No Yes Yes Check defrost sensor. Ok? No Replace sensor Check application limit s. Ok? ** Check for blockage on ou tdoor coil and drain pan. Are the holes in d rain pans blocked? No Beyond opera ...
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Carrier 38MVQ - page 35
35 CHAR T 10 - - COMPRESSOR Check contacto r outpu t on ou tdoor board if not done already. If bad, replace outdoo r board. * For size 9 and 12k uni ts contactor is on outdoor boa rd. Trace connections fro m OD b oard . Con nectio ns ok? Check compre ssor windings. Ok ? No fix connection No Yes Check capacitor. Capacitor ok? Yes Check contacto r.* ...
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Carrier 38MVQ - page 36
36 CHAR T 1 1 - - OUTDOOR MOTO R Trace connections fro m OD board. Connections ok? Mot or ok. Fix connection No Yes Yes No Replace capacitors Yes No Replace motor Check capacitor. Capacitor ok? Check motor winding s. Ok? Visu ally confir m tha t fan blades and outdoor coil are not blocked. Clear blockag e Yes No Trace connections fro m OD board. Co ...
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Carrier 38MVQ - page 37
37 CHAR T 12 - - REVERSING V AL VE Check RV connection on outdoor board. Ok? Clean or r epair the connection No Yes Yes Check R V outpu t o n ou tdo or boar d. Ok ? No Replace outdoor board Replace reversing valve. Yes Check RV solenoid. Ok? Replace solenoid No Check RV connection on outdoor board. Ok? Clean or r epair the connection No Yes Yes Che ...
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Carrier 38MVQ - page 38
38 APP ENDIX APPENDIX T ABLE OF CONTENTS DESCRIPTI ON NUMBER Contr ol Boa rds I nput/ Out put ta bl es f or 53MVC009( 12)- - - - - -1 A1 ................................................... Contr ol Boa rds I nput/ Out put ta bl es f or 53MVQ 009(12)- - - - - -1 A2 ................................................... Contr ol Boa rds I nput/ Out put ...
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Carrier 38MVQ - page 39
39 A 1 -- 5 3 M V C 0 0 9 -- -- -- 1 / 5 3 M V C 0 1 2 -- -- -- 1 3 8 M V C 0 0 9 --- --- --- 1 / 3 8 M V C 0 1 2 --- --- --- 1 C O N T R O L B O A R D CON NECTO R INPUT or OUTPU T VAL UE CN2 OUT : (Pin 1: Pu lse 0 to 12 V olts DC) (Pin 2: 35±2 Volts DC) (Pin 3: GND) (Pin 4: 13±4 Vol ts DC) all relative to Pin 3 CN3 OU T : Neu tr al CN4 IN: Neu t ...
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Carrier 38MVQ - page 40
40 A 3 -- 5 3 M V C 0 1 2 -- -- -- 3 3 8 M V C 0 1 2 --- --- --- 3 C O N T R O L B O A R D CON NECTO R INPUT or OUTPU T VAL UE CN2 OUT : (Pin 1: Pu lse 0 to 12 V olts DC) (Pin 2: 35±2 Volts DC) (Pin 3: GND) (Pin 4: 13±4 Vol ts DC) all relative to Pin 3 CN3 OUT : L2 208/230 Volt AC CN4 IN : L2 208/230 Volt AC CN9 OUT : L1 208/230 Volt AC CN10 I N: ...
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Carrier 38MVQ - page 41
41 A 5 -- 5 3 M V C 0 1 8 -- -- -- 3 3 8 M V C 0 1 8 --- --- --- 3 C O N T R O L B O A R D CON NECTO R INPUT or OUTPU T V ALUE CN1 IN : 14.5±5V Vol ts AC CN3 Pulse Sign al 0 to 24 Volts DC (R elativ e to gr oun d) CN4 IN : L1 208/230 Volts AC CN5 IN : L2 208/230 Volts AC CN6 OUT : 208/230 Volts AC CN8 OUT : 208/230 Volts AC 4 0 M V C 0 1 8 --- --- ...
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Carrier 38MVQ - page 42
42 A6 - - Ch aracteris tics o f Tempera ture S enso r Te m p . ˚ F/ ˚ C Resistan ce K Ω Te m p . ˚ F/ ˚ C Re sistance K Ω Te m p . ˚ F/ ˚ C Resistance K Ω 14/ - - - 10 62.2756 62.6/17 14.6181 111.2/44 4.3874 15.8/ - - - 9 58.7079 64.4/18 13.918 113/ 45 4.2126 17.6/ - - - 80 56.3694 66.2/19 13.2631 114.8/46 4.0459 19.4/ - - - 7 52.2438 68/2 ...
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Carrier 38MVQ - page 43
43 A7 - - Fuse Ch art Unit Size Fuse Rating (Amps/Volts) Indoor Outdoor Outdoor 009 --- 3.15A/250V 2A/250V 012 --- 3.15A/250V 2A/250V 018 3.15A/250V 3.15A/250V --- 024 3.15A/250V 3.15A/250V --- Th e 3.15A fu ses protect the boa rd again st the indoor o r outdo or fa n motor s. The 2A fus es p rote ct t he board a gai ns t a Class I I c irc ui t boa ...
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Carrier 38MVQ - page 44
44 Copyright 2008 Carrier Corp. S 7310 W . Morris St . S Indianapolis , IN 46231 Manufacturer reser ve s the right to change, at any time, specifications and designs without notice and w ithout obligations. Catal og No .38 - - - 40MV - - - 1SM Replaces : New Printed i n U.S.A. Edi tion Da te: 03/0 8 38/40MV C, MVQ ...
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