6
Table 1A — Physical Data, 50TJ016-028 (SI)
LEGEND *Circuit 1 uses the lower portion of condenser coil and lower portion of evapo-
rator coils, and Circuit 2 uses the upper portion of both coils.
†The 50TJ028 units requires 50-mm industrial-grade filters capable of han-
dling face velocities of up to 3.2 m/s (such as American Air Filter no. 5700 or
equivalent).
UNIT SIZE 016 024
028
(Standard)
028
(High Static DEC Option)
NOMINAL CAPACITY (kW) 52.8 70.3 87.9 87.9
OPERATING WEIGHT (kg) 708 816 885 885
EconoMi$er 36.3 36.3 36.3 36.3
MoistureMiser Dehumidification Package 18.1 18.1 18.1 18.1
COMPRESSOR Scroll
Quantity...Model (Ckt 1, Ckt 2)
2...ZR108KC
1...ZR16M3,
1...ZR125KC
1...ZR19M3,
1...ZR16M3
1...ZR19M3,
1...ZR16M3
Capacity Stages (%) 50/50 55/45 60/40 60/40
Number of Refrigerant Circuits 222 2
Oil (ml) (Ckt 1, Ckt 2) 3135 4022, 3135 4022, 4022 4022, 4022
REFRIGERANT TYPE R-22
Expansion Device TXV
Operating Charge (kg)
Circuit 1* 4.81 6.76 9.07 9.07
Circuit 2 4.81 5.72 6.03 6.03
CONDENSER COIL Cross-Hatched
3
/
8
-in. Copper Tubes, Aluminum Lanced,
Aluminum Pre-Coated, or Copper Plate Fins
Rows...Fins/m 2...669 3...590 4...590 4...590
Total Face Area (sq m) 2.02 2.02 2.02 2.02
CONDENSER FAN Propeller Type Propeller Type
Nominal L/s 6700 8600
Quantity...Diameter (mm) 2...762 2...762
Motor BkW...r/s 0.75...17.9 3.73...17.9
Watts Input (Total) 3400 7800
EVAPORATOR COIL Cross-Hatched
3
/
8
-in. Copper Tubes, Aluminum Lanced
or Copper Plate Fins, Face Split
Rows...Fins/m 2...669 3...590 4...590 4...590
Total Face Area (sq m) 1.63 1.63 1.63 1.63
EVAPORATOR FAN Centrifugal Type
Quantity...Size (mm) 2...254 x 254 2...305 x 305 2...305 x 305 2...305 x 305
Type Drive Belt Belt Belt Belt
Nominal L/s 2832 3776 4720 4720
Motor kW 2.76 5.59 7.46 7.46
Motor Nominal r/s 28.8 29.1 29.0 29.0
Maximum Continuous BkW
3.17 (400 v),
2.57 (220 v)
7.68
9.92 (400 v),
8.60 (220 v)
9.92 (400 v),
8.60 (220 v)
Motor Frame Size 56H 213T 215T 215T
Fan r/s Range Low-Medium Static 12.38-16.38 12.8-15.2 14.8-17.8 14.8-17.8
High Static 17.05-21.67 16.6-20.3 18.6-22.4 18.6-22.4
Motor Bearing Type Ball Ball Ball Ball
Maximum Allowable r/s 25.8 25.8 25.8 25.8
Motor Pulley Pitch Diameter (mm) Low-Medium Static 79/104 140/165 125/150 125/150
High Static 94/119 137/168 125/150 125/150
Nominal Motor Shaft Diameter (mm) 22 35 35 35
Fan Pulley Pitch Diameter (mm) Low-Medium Static 152 239 203 203
High Static 132 201 163.0 163.0
Nominal Fan Shaft Diameter (mm) 30 36.5 36.5 36.5
Belt, Quantity...Type...Length (mm) Low-Medium Static 1...BX...1067 1...BX...1372 2...BX...1270 2...BX...1270
High Static 1...BX...1067 1...BX...1270 2...BX...1194 2...BX...1194
Pulley Center Line Distance (mm) 343-394 371-391 371-391 371-391
Speed Change per Full Turn of
Movable Pulley Flange (r/s)
Low-Medium Static .80 .47 .60 .60
High Static .92 .62 .75 .75
Movable Pulley Maximum Full Turns
From Closed Position
Low-Medium Static 555 5
High Static 565 5
Factory Setting 3.5 3 3 3
Factory Speed Setting (r/s) Low-Medium Static 13.58 13.75 16.01 16.01
High Static 18.43 18.42 20.08 20.08
HIGH-PRESSURE SWITCH (kPa)
Cutout 2951
Reset (Auto.) 2206
LOW-PRESSURE SWITCH (kPa)
Cutout 186
Reset (Auto.) 303
FREEZE PROTECTION THERMOSTAT (C)
Opens –1 ± 2
Closes 7 ± 2
ELECTRONIC PROTECTION MODULE
Cutout (ohms) 4500 ± 900 4500 ± 900 4500 ± 900 4500 ± 900
Reset (ohms) 2750 ± 450 2750 ± 450 2750 ± 450 2750 ± 450
OUTDOOR-AIR INLET SCREENS Cleanable
Quantity...Size (mm) 2...508 x 635 x 25
1...508 x 508 x 25
RETURN-AIR FILTERS Throwaway†
Quantity...Size (mm) 4...508 x 508 x 50
4...406 x 508 x 50
Bhp — Brake Horsepower
DEC — Design Enhancement Center
TXV — Thermostatic Expansion Valve
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