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Table 3 90MA/MF Physical Data -- Refrigerant 134a
R--134a -- English Units R--134a -- Metric Units
BASE UNIT 90MA/MF UNITS
English (Metric)
308 312 308 312
NOMINAL CAPACITY Tons (kW) 5. 5 8 19.3 28.1
OPERATING WEIGHT
Base Unit Pounds (kg) 895 950 406 431
Discharge Plenum Pounds (kg) 50 50 22.7 22.7
COMPRESSOR TYPE -- Reciprocating Semi--Hermetic Semi--Hermetic
Quantity of Cylinders 4 6 4 6
Quantity of Unloading Cylinders 0 2 0 2
Quantity of Capacity Steps 1 2 1 2
DISCHARGE PRESSURE SWITCH
Opens psig (kPa) 33510 231069
Closes psig (kPa) 23520 1620138
SUCTION PRESSURE SWITCH
Opens psig (kPa) 73 4821
Closes psig (kPa) 225 15235
OPERATING CHARGE pounds (kg) 11.2 10 5.1 4.5
CONDENSER
Number & T ype 1....T ube In Tube 1....T ube In Tube
Water Volume gallon (liter) 2.42 9.2
EVAPORATOR AIR FAN Adjustable, Belt Driven Centrifugal: 1750 RPM Motor @ 60 Hz
Nominal Flow cfm (m
3
/h) 3000 4000 4245 5660
Standard Speed Range RPM 495--700 600--850 412--583 500--708
Maximum Allowable RPM 1050
Belt Quantity / Pulley Pitch Diameter inc hes (cm) 1/8.5 1/7.0 1 / 21.6 1 / 17.8
Motor Pulley Pitch Diameter Range inches (cm) 2.4to3.4 6.1to8.6
Motor Nomina l Rating(@60 Hz)...Frame Size
Standard horse power 1...56 2...56 .75 / 56 1.5 / 56
Alternate(SeeNote1) horse power 2...56 3...56 1.5 / 56 2.2 / 56
Alternate(SeeNote1) horse power 3...56 -- -- 2.2 / 56 -- --
EVAPORATOR COIL 3/8 OD(0.95) cm, Copper Tubes, Aluminum Fins
Tube Type Prime
Quantity of Rows...fin Spacing fins/inch(cm) 3...12.5 3...14.9
Face Area sq ft (sq m) 7.3 8.5 0.68 0.79
RETURN AIR FILTERS Factory Supplied, Cleanable
Quantity...Size inches (cm) 4...16 x 20 x 1 4...40.6 x 50.8 x 2.5
CONDENSER CONNECTIONS
Water Inlet (bottom) & Outlet (top) inches FPT 1 1 1 1
Maximum Working Pressure (refrigerant side) psig (kPa) 400 2758
CONDENSATE DRAIN CONNECTIONS inches FPT 3/4 3/4
ACCESSORY HEATING COILS
HOT WATER
Quantity of Rows...fin spacing fins/inch(cm) 2 ...1 4 2 ...14 2...5.5 2...5.5
Face Area sq ft (m) 6 6 0.56 0.56
Water Inlet (top) & Outlet Connection (bottom) inches (cm) 1--1/4 MPT 1--1/4 MPT
STEAM
Quantity of Rows...fin spacing fins/inch(cm) 1 ...1 4 1 ...14 1...5.5 1...5.5
Face Area sq ft (m) 6.9 6.9 0.64 0.64
Water Inlet (top) & Outlet Connection (bottom) inches (cm) 1--1/4 MPT 1--1/4 MPT
LEGEND
FPT = Female Pipe Thread MPT = Male Pipe Thread ODF = Outside Diameter Female
NOTES:
1. Motorsand drives otherthanthosefurnished with unitmust bepurchased separately.Contact yourCarrier Transicoldrepresen-
tative.