Carrier 48MA- Manuals

Carrier 48MA– User Manual, Manual in PDF format online.

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User Manual
Manual

User Manual Carrier 48MA

Summary

Page 2 - Table 1 — Physical Data

Table 1 — Physical Data UNIT 48MA OR SOME Zone Modules OPERATING WT (lb) Bose Unit 48MABose Unit SOME (with heat)Roof Curb REFRIG CHARGE (lb, R-22) COMPRESSOR No. 1 Type Cylinders ... Unloaders No. 2 Type Cylinders (has no unloaders) System Oil Charge (pts) Unlaader Settings (psig) Left Bank Right B...

Page 5 - LBS OF DRY AIR

GRAINS OF MOISTURE/ LBS OF DRY AIR % removed 99 - 68 100 = 88.5% 99 - 64 The 1000 cfm of outdoor air at 68 grains is mixed with 8000 cfm of return air at 75 F/50% room conditions (64 grains). This mixture then enters the zone modules and is cooled and dehumidified by the zone coil. Heating (General)...

Page 6 - NATURAL GAS FIRED UNITS

GV - Gas Vaive (Zone Module) MS ~ Main Burner MGV - PS - Main Gas Vaive Pilot Sorrier PV ~ Pilot Valve (shutoff; MOTSS: t Pirst stage of gas valve is a 115-vott sok-noid; second stage is a 24-voit soienoid with .60% gas bvpess. Gnits 48MA034 ano 040 fi ave one pilot shotoff valve feeding all pilot b...

Page 7 - нот; SYSTEM SELECTION AND OPERATION; у XT

нот WATER/GLYCOL HEATING SYSTEM - Hot water is a frequent selection for heating due to simplicity of the piping system, the ease in maintaining uniform temperature control and quieter operation. In addition, when renovating an existing building, a hot water heating plant is usually available. Carrie...

Page 8 - The outdoor air load with respect to room condi-; outdoor ail; conditions illustrated in the 48MA/50ME rating; OA WET BULB; Fig. 6 — Outdoor Air Load Selection Chart

The outdoor air load with respect to room condi- as follows: outdoor ail total heat (OATH) = 4 5 (hgg:,- Ьго,ошХ (OA cfm) = 4.5 (38.61 - 28.29) (1000)= 46,440 Btuh Or, a graph, shown 'in Fig. 6, can be used to find the OA load factor, 4.5 (hoa “ hfoom). for all conditions illustrated in the 48MA/50M...

Page 9 - Table 2 — Capacity vs Cfm Changes; RSHC; — Room Sensible Heat Capacity; RSL; — Room Sensible Load; RTC; — Room Total Capacity

The unit capacity available to offset room loads is. Room TC = Unit TC — outdoor air TC = 282,000 -46,500 = 235,500 Btuh Room SHC = Unit SHC — outdoor air sensible heat = 219,000 -21,800 = 197,200 Btuh For comparison: GTLSL RTLRSL Load 275.000 Btuh 215.000 Btuh 226.000 Btuh 197,200 Btuh Unit Capacit...

Page 10 - II; L O A D

a: LJ II a z> 2 2 O O I 0 95 90 85 80 75 < a . < •% CFM CHANGE ■ FROM NOMINAL Fig. 7 — 48MA/50ME Room Capacity Multipliers Power Wiring Data — The 50ME028, 460-3-60 unit with 132 kw of electric resistance heat, has a 75.8 cooling circuit minimum wire ampere and a heating circuit minimum wir...

Page 12 - NEGATIVE STATIC PRESSURE AT UNIT RETURN

3,000 100 I 15 2 25 3 .4 5 .6 7 8 9 10 NEGATIVE STATIC PRESSURE AT UNIT RETURN Fig. 8 — Ventilation Air Chart, 48MA/50ME016 Fig. 9 — Ventilation Air Chart, 48MA/50ME024 Fig. 10 — Ventilation Air Chart, 48MA/50ME028,030 Fig. 11 — Ventilation Air Chart, 48MA/50ME034,040 1 2

Page 13 - Fig. 14 — Economizer Condensing Schematic

If a zone thermostat calls for cooling while in economizer mode, a set of cooling relay (CR) contacts close, energizing the economizer relay (ECR). See Fig. 14. The ECR is a DPDT plug-in relay. For economizer damper control, the ECR locks out the outside air damper adjustable poten tiometer and shi...

Page 14 - MIXED AIR THERMOSTAT; CHR; Fig. 15 — Economizer Damper Control Schematic; Fig. 16 — Exhaust Damper Operation

OA damper adjust MIXED AIR THERMOSTAT MOTOR POT LEGEND CHR — Crankcase Heater Relay ECR — Economizer Relay LAT — Low Ambient Thermostat OA — Outside Air Fig. 15 — Economizer Damper Control Schematic Economizer And Exhaust Performance — An economizer can be readily factory installed on the 48MA/50ME ...

Page 15 - Economizer Economics; qqq

m complicated return air duct systems with static pressure greater than -0.2 in. wg at the return air plenum, duct mounted return air exhaust fans can be installed for proper airflow. However, return air exhaust fans add to the operating cost and increase noise level. More efficient duct design meth...

Page 16 - Night Setback

The cooling load for this comparison is the internal load (lights and people) minus the negative transmission at the changeover temperature (48 F). To determine the percent cooling load, compare this value to the unit design cooling capacity. Night Setback — Niglit setback control can be added to a ...

Page 17 - P i g; — Resistor

1 AB — Accessory Board AFS - AirfI ow Switch APS — Air Pressure Switch C — Compressor Contactor Cap. — Capacitor CB — Circuit Breaker CCB — Compressor Circuit Breaker CCP — Capacity Control Pressurestat CH — Crankcase Heater CHR — Crankcase Heater Relay CL — Switch, Cooling Lockout CO — Convenience ...

Page 18 - Fig. 19 — Unit As Shipped From The Factory

C2-2 OFCI L2 ZB L2 *B ----------- aSlL------------------ LLS7 1 9 41^ 7 LLS6 1 ——lF=------------------------- 3C*S»i LLS9 1 LLS4 1 LLS3 1 ----------- aSUi----------------- LLS* 1 ——|F=------------------------- ^CRI, LLSI ---------------II----------------- I lls zb (• zone only ) TO ZONE CONTBOL SCHE...

Page 19 - i cb

In this system, the MUR is energized by the NS controls. This opens a set of normally closed contacts and shuts down the unit, including indoor fans. The outdoor air dampers are also closed by the MUR. Cooling lockout is attained by energizing the MCR. Energizing these relays turns the unit off and ...

Page 21 - Dimension A is approximately 7 in for optimum performance; Fig. 23 — Acoustical Trap Installation

Again, 2 jumper wires have to be removed from the back of the remote panel to isolate the day/night switch. MORNING START-UP — To conserve energy and lower total operating costs, the outdoor dampers may be closed when starting the system in the morning. During a warm-up period, when the system is op...

Page 24 - r O; E L; HCII; lo; O O; O O; Fig. 24 — Zone Control Board

fR Q-Q MODULE I NEAR SIDE r O wi O—a ,. CR3 [Y X '"CW Y O-io , GV5 w*0^ 0 0 o 0 HCI -2 0 0 o 0 o o HR2-I HR2-2 0 0 0 HC2 0 0 o •2 o o 0 0 o HCZ o o 0 HR3-I HC3 HR3-2 0 0 0 0 0 0 HC3 0 -2 0 O 0 HR4-I HR4-2 O 0 o HC4 0 0 o -2 0 o 0 o o HC4 0 O 0 HR5-I HC5 -1 HR5-2 0 O O 0 O 0 HC9 0 •2 o o o HR«-I ...

Page 31 - COOLING

ANTICIPATOR SETTINGS HAI .13 HA2 .57 NOTE: COOLING Stage 1 — Module 3 Stage 2 — Module 2 & 4 If thermostat wires are interchanged, the reverse may be obtained HEATING Stage 1 — First Stage of Modules 2,3 & 4 Stage 2 — Second Stage of Modules 2,3 & 4 LEGEND CR - Control Relay GV - Gas Val...

Page 32 - PERFORMANCE DATA; COOLING CAPACITIES; n o; no IT

PERFORMANCE DATA Room Design 75 F/50% Rh COOLING CAPACITIES 48MA/50ME016 OUTDOOR TOTAL UNIT CFM AlP 4,000 5,000 6,000 TEMP Outdoor A r Cfm Dutdoor A r Cfm Outdoor Air Cfm 0 750 1500 6 750 1500 0 750 1500 Db Wb TC SHC K w TC SHC K w TC SHC K w TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SHC ...

Page 33 - Sipop; б ’ о; TTo

PERFORMANCE DATA Room Design 78 F/50% Rh COOLING CAPACITIES 48MA/50ME016 OUTDOOR AIR TEMP Db 85 90 95 100 105 no 115 TC 183 J83 178 178 178 178 174174174 174 274 169169 ]6? 165 165 160 156 0 SHC Sipop Outdoor Air^Cfm 750 1 32 Ш 131 131 131 13] 129 129 129 129 229 127 127 1?7 125 2 25 223 121 Kw 15 5...

Page 35 - TOTAL UNIT CFM

PERFORMANCE DATA Room Design 75 F/50% Rh COOLING CAPACITIES 48MA/50ME030 TOTAL UNIT CFM 8,000 10,000 A1K Outdoor Air Cfm Outdoor Air Cfm ■ cMr 0 1000 2000 2500 0 1000 2000 2500 Db Wb TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw 65 298 215 "29 T' 311 229 30 5 31...

Page 36 - T O T A L U N I T C F M

COOLING CAPACITIES 48MA/50ME030 PERFORMANCE DATA Room Design 78 F/50% Rh O U T D O O R A I R T O T A L U N I T C F M 8,000 O u t d o o r A i r C f m 10,000 O u t d o o r A i r C f m 0 1 00 0 2 00 0 2 5 0 0 0 1 00 0 2 00 0 2 5 0 0 D b W b T C S H C К w T C S H C K w T C S H C К w T C S H C K w T C S ...

Page 37 - loop; IIP

PERFORMANCE DATA Room Design 80 F/50% Rh COOLING CAPACITIES 48MA/50ME030 O U T D O O R A I R T E M P pb _ 8 5 9 0 9 5 100 1 0 5 110 1 1 5 Wb ^ 6 5 7 0 6 5 7 0 7 3 7 5 6 5 7 0 7 5 7 8 1P_ 7 0 7 5 7 8 7 0 75 7 8 7 5 T C 319319 *312 312312312 306 306 306 306306 299 299299 292 292 266 261 0 S H C 218218...

Page 38 - TC

COOLING CAPACITIES 48MA/50ME034 PERFORMANCE DATA Room Design 75 F/50% Rh O U T D O O R A I R T E M P 0 — D b W b __ S H C K w 8 5 6 5 325 254 29 1 7 0 325 254 29 1 6 5 318 “зоТ 9 0 7 0 318 251 30 2 7 3 318 251 30 2 7 5 318 251 30.2 6 5 310 247 31 3 7 0 310 247 31.3 9 5 7 5 310 247 31 3 7 8 310 247 3...

Page 40 - lis; TQ

COOLING CAPACITIES 48MA/50ME034 PERFORMANCE DATA Room Design 80 F/50% Rh TOTAL UNIT CFM AIR 10,000 11,000 T P L 4 P Outdoor Air Cfm Outdoor Air Cfm _____ 0 lOOC 2000 3000 0 1000 2000 3000 Db Wb TC SHC Kw TC SHC Kw TC SHC Kw TC SHC К w TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Г Kw 85 65 343 247 30 1 352 ...

Page 42 - fm

COOLING CAPACITIES 48MA/50ME040 PERFORMANCE DATA Room Design 78 F/50% Rh OUTDOOR AIR . — - .... 11,000 — — TOTALU 1! .T C F M . .... — 12,000 - ^ ^ .. — ------------------- Outdoor Air Cfm Outdoor Air Cfm 0 1000 2000 3000 0 1000 2000 3000 Db Wb TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SH...

Page 43 - U U 1 D U U K

PERFORMANCE DATA Room Design 80 F/50% Rh COOLING CAPACITIES 48MA/50ME040 # TOTAL UNIT CFM OUTDOOR inooo 12,000 AIR Outdoor Air Cfm Ou tdoor Air Cfm TEMP 0 1000 2000 3000 0 ”K w 1000 2000 3000 Db Wb TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SHC TC SHC Kw TC SHC Kw TC SHC Kw 85 65 378 256 37.1 417 29...

Page 44 - FAN PERFORMANCE; Zone No; Pulley Selection

The procedure for determining required fan speed (rpm) and shaft horsepower for a 48MA (or SOME) unit is described below. Since the various unit zones operate at different air quantities and different external resistances, it is necessary to identify the zone having the highest static pressure requi...

Page 45 - Shp; Ji±l; INDOOR AIR FAN MOTOR DATA

016 and 024 028 and 030 Table 4 — Fan Performance FAN PERFORMANCE U N IT 48 M A / S O M E C F M 0.2 0.4 0.6 E X TE R N A L S T A T IC P R E S S U R E (in. w g) 0.8 ] 1.0 ~J 1.2 [ 1.4 1[ 1.6 F an R pm Shp 1.8 1 2.2 5.000 6.000 7.000 8.000 9.000 9,600 7.000 8.000 9.000 10,000 11,000 12,000 7.000 8.000...

Page 46 - pp

pp INCHES H20 EXTERNAL STATIC PRESSURE BRAKE HORSEPOWER INCHES H20 EXTERNAL STATIC PRESSURE <jt b BRAKE HORSEPOWER ^ o> 00 o to CO CO 03 3 T3 (0 3 03 3 o m 00 o m s 00 o CO o s i > 30NviAiaoda3d wvd

Page 47 - cc

FAN PERFORMANCE * O < cc </> V) o z 6000 8000 10000 12000 CFM-STD AIR 14000 Fig. 34 - Fan Performance, 48MA/50ME034,040 45

Page 48 - Table 6 — Gas Heating Capacities (1000 Btuh)

HEATING PERFORMANCE Table 5 — Electric Heater Performance U N IT H E A T T O T O T A L S T E P S O F H E A T K W /S TE P S O M E C O O L R A T IO H E A TE R K W P E R M O D U LE P E R M O D U LE 016 .75 1 53 2 3 3 & 1 1 70 2 4.4 024 1.5 1 106 3 4.4 028 75 1 66 2 3.3 & 1 1 88 2 4.4 030 1.5 1 ...

Page 49 - Fig. 36 — Module Pressure Drop

1 Determine zone module air quantity as described in the Selection Procedure (1000 cfm) 2 Enter curve at determined zone moduie air quantity Project left to intersect with entering air temperature curve (70 F) 3 From this intersection, project up to intersect with entering water temperature (180 F) ...

Page 50 - coi; Full Load Amps

ELECTRICAL DATA Table 7 — Electrical Data, 48MA U N IT M O D E L 48M A 016 48M A 024 48M A 028 48M A 030 48M A 034 48M A 040 V -P H -H Z V O L TA G E R A N G E C Ô M P R E S ! N O . 1 ^ ■ -j >6 r C B coi 1P R E Î N O . 2 > S O R C B O U T D O O R F A N M O TO R FL A C O M B U S T F A N M O TO ...

Page 51 - Table 8 — Cooling Electrical Data, 50ME; FLA; LRA

Table 8 — Cooling Electrical Data, 50ME ELECTRICAL DATA (Contd) C O M P R E S S O R c o m p r e s s o r “ O U T D O O R IN D O O R ■ ' P O W E R S U P P L Y V O L TA G E N O . 1 N O . 2 F A N M O T O R F A N M O T O R M ax U N IT V -P H -H Z R A N G E C B ......... C B F LA F L A W ire F use M in M ...

Page 52 - Table 9 — Electric Resistance Heater Data; C8 MTA

ELECTRICAL DATA (Contd) Table 9 — Electric Resistance Heater Data H E A TIN G E L E M E N T S P E R ZO N E M O D U LE „ ---- ----... ------ --------- F U LL LO A D C B M TA M A X F U S E M IN W IR E A M P S P E R E A C H A M P S A M P S H E A TIN G Z O N E E A C H E A C H E L E M E N T M O D U LE C ...

Page 53 - Fig. 37 — Common Feeder Wiring

3. Where a single feeder is to be used, the cooling power tap may be sized according to the Cooling Minimum Wire Amps shown in the Power Wiring Data, Table 1 0, provided the tap is 10 ft or less in length and enclosed in a raceway Similarly, the heating power tap may be sized according to the Heatin...

Page 54 - Table 10 — Power Wiring Data; UNIT; MINIMUM WIRE AMPS; IFM

ELECTRICAL DATA (Contd) Table 10 — Power Wiring Data UNIT 50ME016 50ME024 50ME028 50ME030 MINIMUM WIRE AMPS V O L TS (N om ) K W (U nit T otal) C o oling H eatin g C ircu it _ U N IT L ro m m o n V O L TS (N om ) K W (U nit T o tal) C o oling H eatin g C ircu it C o m m on 1 2 1 2 200 53 109 8 215.0...