Page 3 - Electric
/ Rugged extruded aluminum frames and protective grilles provide strength and good looks. Unit will not sag during rigging. Low silhouette — The cabinet has no vents or hoods to break up the clean appearance. The curb-mounted unit seldom requires a parapet to hide it from street level view. <5 Hu...
Page 5 - Low operating costs; operating; Superior humidity control
and why it’s best. Low operating costs On partial load, the Carrier compres sors unload cylinders to match compressor output to cooling needed with up to 6 steps of reduction. To maintain balanced operation, the hot gas bypass system diverts hot refrigerant to the outdoor air cooling coil as neede...
Page 6 - Accessories and factoryii'stalled options; Cooling only unit (SOME) — Unit is
Accessories and factoryii'stalled options Hot water/glycol heating (SOME) — Often, such as when renovating existing buildings, a heating plant is available. For these applications, Carrier’s hot water/glycol heating unit may be ideally suited Each zone module has its own high-capacity heating coil A...
Page 8 - UNIT
Roof curb dimensions (48MA) COMPRESSOR, CONDENSER AND CONTROL BOX END ' OF UNIT 48MA0M. 040 02 ZONE) ZONE MODULE END CURB DETAIL '6'.4|"4SMA028, '030 (10 ZONE MODULES) 5'-r 48MA016, 024 (8 ZONE MODULES) MAIN GAS l3 FPT CONN ON SASE UNIT evaporator (ZONE MODULE ¡AIRFLOW * NOT USED ON 48MA0t6,024(...
Page 11 - iilL
Roof curb dimensions (SOME) COMPSeSSOR, CONDENSER AND CONTROL SOX END OF UNIT ELECTRIC resistance HEATER POWER Ag'KO ON UNIT ) GLYCOL CONN I г"РРТ ON UNIT -10Й SUPPLY’ 030 OOZONE MODULES) 5' 50ME0I6.024 ¡8 ZONE MODULES) ЮЙ' SUPPLY GLYCOL CONN 2"PPT ON UNIT i f ) evaporator (ZONE module ; AIR...
Page 12 - Selection procedure
Selection procedure (with example) Refer to Carrier’s Engineering Guide for Multizone Unit Systems and contents of this booklet for typical multizone design considerations. Using the Engineering Guide, calculate cooling and heating load estimates for the areas to be served by the multizone unit. Di...
Page 13 - CAPACITY VS CFM CHANGES; ZONE COOLING CAPACITY MULTIPLIERS; Determine fan requirements
CAPACITY VS CFM CHANGES ZONE NO. OF RSL/ZONE % DEVIATION % CFM CHANGE jUNIT TOTAL CFM3 CAPACITY I multiplier UNIT NOMINAL RTC/ZONE ADJUSTED NO. MODULES PEAK LOAD (RSL/NOM UNIT RSHC) FROM NOMINAL UNIT RTC ... 1 1 16,935 16,935/19,720 .86* -20 720 i 9 X 23,556 21,200 2 1 22,505 22,505/19,720 1.14 +20 ...
Page 14 - Performance data; COOLING CAPACITIES
Performance data Room Design 75 F/50% Rh COOLING CAPACITIES 48MA/50ME016 OUTDOOR Db 85 90 95 100 105 no 115 OUTDOOR T O T A L U N I T C F M R 4,000 5,000 6,000 Outdoor Air Cfm Outdoor Air Cfm Outdoor Air Cfm 0 750 1500 0 750 1500 0 750 1500 Wb TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SHC K w TC SH...
Page 18 - IS
Performance data Room Design 78 F/50% Rh COOLING CAPACITIES 48MA/50ME016 Db 85 90 95 100 105 no 115 T O T A L U N I T C F M R 5,000 . 6,000 7,000 IP Outdoor Air Cfm Outdoor Air Cfm Outdoor Air Cfm 0 750 1500 0 750 1500 0 750 1500 Wb TC SHC Kw TC SHC Kw TC SHC Kw TC SHC Kw TC SHC K w TC SHC Kw TC SHC...
Page 21 - U U 1 U U U K
Performance data Room Design 78 F/50% Rh COOLING CAPACITIES 48MA/50ME040 i'i T O T A L U N I T C F M U U 1 U U U K AIR TEMP 11,000 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 SHC Kw TC SHC Kw TC SHC Kw 85 65 372 ...
Page 26 - FAN PERFORMANCE; INDOOR AIR FAN MOTOR DATA
Performance data U N I T 4 8 M A / S O M E 0 1 6 a n d 0 2 4 0 2 8 a n d 0 3 0 0 3 4 a n d 0 4 0 FAN PERFORMANCE E X T E R N A L S T A T I C P R E S S U R E ( i n . w g ) C F M 0:2 1 " 0 74 0.6 0.8 y i.b u ; F a n R p m 1.4 1 1.8 ^ 1 2.0 2.2 B h p 5,000 ' - 1 740 810 i 880 945 1005 ' 1060 1100 '...
Page 28 - Electrical data; ELECTRICAL DATA, 48MA
Electrical data ELECTRICAL DATA, 48MA UNIT MODEL 48MA016 48MA024 48MA028 48MA030 48MA034 48MA040 - ' - - - — . ....--- -- - COMPRESSOR COMPRESSOR OUTDOOR COMBUST INDOOR POWER SUPPLY V/PH/HZ VOLTAGE NO 1 Nn 9 FAN MOTOR FAN FAN '-------- --- -- RANHF — - FLA MOTOR MOTOR Min Max — RLA LRA CB RLA LRA CB...
Page 29 - ELECTRICAL DATA, SOME
ELECTRICAL DATA, SOME UNIT MODEL 50ME016 50ME024 50ME028 50ME030 50ME034 '0 50ME040 — ■ ... . ---- - ■ ■ V/PH/HZ VOLTAGE COMPRESSOR NO. 1 COMPRESSOR NO. 2 OUTDOOR FAN MOTOR PI A INDOOR FAN luinmo RANGE CB MTA CB MTA Min Max RLA LRA RLA LRA No. 1 No. 2 No. 3 Hp FLA 200/3/60 180 229 63 6 266 89 0* — —...
Page 30 - ELECTRIC RESISTANCE HEATER DATA
Electrical data (cont) U N I TS O M E 0 1 6 a n d 0 2 4 0 2 8 a n d 0 3 0 0 3 4 a n d 0 4 0 ELECTRIC RESISTANCE HEATER DATA ' E L E C H E A T K W - — --- V O L T S ( 3 - P h 6 0 - H i ) H E A T I N G F U L L L O A D C B M T A M A X F U S E M I N W I R E E L E M E N T S A M P S P E R E A C H A M P S ...
Page 31 - POWER WIRING DATA; General information
UNIT 50ME016 50ME024 50ME028 50ME030 V O L T S K W M I N I M U M C K T A H o o t i n g M P ( N o m ) ( U n i t T o t o l ) C o o l i n g C i r c 1 u i t 2 C o m m o n 2 00 53 109 8 190.5 _ 206 7 230 53 98 9 165.6 — 181 7 460 53 49 5 82.9 - 90.9 2 00 70 109.8 254.0 — 270.2 230 70 98 9 220.9 - 234 1 4...
Page 32 - Electriccü data; Operating sequence
Electriccü data (cont) Operating sequence When unit power is on and no zone thermostat is calling for cooling or heating, the indoor air fan and crankcase heaters are on. The outdoor air dampers are at the preset position, the burner pilots are lit and the forced-draft fan is on. Cooling — On call f...
Page 33 - Refrigeration system; Psychrometrics — The 48MA/50ME units differ psychro-; Application data; PSYCHROMETRIC CHART — EXAMPLE
Refrigeration system Psychrometrics — The 48MA/50ME units differ psychro- metrically from the conventional multizones due to the operation of the outdoor air coil. The coil in the Carrier units cools and dehumidifies the outdoor air entering the unit thus assuring that raw outdoor air is not passed ...
Page 34 - Field-fabricated ductwork; Balancing
Application data (cont) heating coil. One connection is required for supply and return hot water/glycol. Connect external piping to the unit in accordance with existing codes. Include proper relief for water flow (the maximum allowable hot water/glycol system working pressure is 30 psi) or a modulat...
Page 35 - MODULE PRESSURE DROP; Diversity
MODULE PRESSURE DROP # NOTE: Greatest module pressure drop represents entire coil pres sure drop. velocity, the friction loss per 100 ft increases significantly. Also, seam and joint leakage in a small duct of long length can prevent delivery of required cfm at the outlet grille. If long runs with ...
Page 36 - Limitations; Module cfm limits and fan performance —; The limita; Dehumidification applications
Application data (cont) correction factors and formulas in the Capacity Correction Factor table. CAPACITY CORRECTION FACTOR (CCF) L O A D T C ( U n i t ) S H C ( U n i t ) D I V E R S I T Y F A C T O R 1 . 0 1 0 i 0 90 9 7 9 4 80 9 4 8 9 RTC (witli diversity) RSHC (witii diversity) [TC (CCF) - OATH]...
Page 38 - Economizer and exhaust performance; air; ECONOMIZER OPERATION; ECONOMIZER CONDENSING SCHEMATIC
Application data (cont) zone cooling thermostats are satisfied, economizer controls arc bypassed and the outdoor dampers are modulated to the minimum ventilation position. Refer to Economizer Economics to determine if the addition of an economizer is justified. Economizer and exhaust performance An ...
Page 39 - Return air systems; ECONOMIZER DAMPER CONTROL SCHEMATIC
The 48MA/50ME exhaust operation is similar in per formance to a relief damper except that the exhaust dampers are mechanically linked to the return air dampers and the condenser fans operate to produce a pressure differential which aids the exhaust cycle. At approximately 0 in. wg at the return air...
Page 40 - Economizer economics
temperature rise of 5 to 10 F does not cause a problem, and special ratings can be made available. In addition, when the supply cfm is reduced, as above, the outdoor air quantity remains constant. This results in a higher than normal percentage of outdoor air which the 48MA/50ME unit may not be capa...
Page 41 - ZONE CONTROL BOARD; Night setback
ZONE CONTROL BOARD SOME # Night setback Night setback control can be added to a 48MA/50ME unit using field-supplied components. There are 3 sets of fer- minals on fhe accessory section as shown in Zone Control Board. Terminal sets are: cooling lockout (CL), night setback (NS) and “Short To Close Dam...
Page 42 - Morning start-up — To conserve energy and lower total; Sound and vibration; ACOUSTICAL TRAP INSTALLATION
Method no. 3 — heating and cooling night setback and indoor fan cycling — This system requires a remote control panel, a heating and cooling thermostat with subbase, a night setback relay and a 7-day timer. Because cooling is not locked out, the clock switches that close at night close the outdoor a...
Page 43 - Carrier 48MA/50ME should ensure that the interfacing of; Thermostat usage and control; Usage — The thermostats used with the 48MA/50ME; The thermostats are automatic changeover with a 3 F; Typical piping and wiring
exercise care when selecting this equipment for use with a multizone. The design and installation of vibration rails on a Carrier 48MA/50ME should ensure that the interfacing of the vibration isolator and the curb maintain watertight integrity. Thermostat usage and control Usage — The thermostats us...
Page 44 - Typical schematic; T—r; —II—; L E G E N D
Typical schematic (SOME shown) L2 BASE UNIT POWER ,,.HR2 II5V aaa CH2 .---------- JfCHR -----------^^£HJ -------------------------------- -- 4 h > j T—r MUR AFS 3 * Jf W Jt * MHR MCR -o £0 ^ oSW ■ S— -O TO DAMPER MOTOR o- -o TO ROLL FILTER °----- II5V r AFS I 24V f- SYSTEM oOFF ^ REMOTE FILTER PA...
Page 45 - Guide specifications
Guide specifications .self-contained electric cooling, Base unit General — Install _ natural or propane gas heating or electric cooling/electric heating (hot water glycol heating) multizone unit(s) specifically designed for rooftop installation mounted on a curbsupplied by unit manufacturer. There ...
Page 46 - Exhaust feature — Provision shall be made for positive; exhaust of room air when unit is operating on economizer; Roll filter — Install a motorized roll filter with 65 ft x 2-in.; of media, a runout switch and automatic advancing switch.; Number One
Guide specifications (cont) Exhaust feature — Provision shall be made for positive exhaust of room air when unit is operating on economizer cycle. Remote control panel — Furnish a remote control panel which contains a ventilation position adjustment, SYSTEM switch, DAY/NIGHT switch, HEAT-COOL-AUTO.-...