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13
Table 1 — Physical Data — 50AJ,AK,AW,AY Units
LEGEND
†Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the
upper portion.
Sizes 050-060: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have
intertwined evaporator coils.
UNIT 50AJ,AK,AW,AY
020
025
027
030
NOMINAL CAPACITY (tons)
20
25
27
30
BASE UNIT
See Operating Weights Table
OPERATING WEIGHT (lb)
COMPRESSOR
Quantity...Type (Ckt 1, Ckt 2)
2…SR*782AT/1…SR*782AE
1…SR*812AT,
1…SR*942AT/1…SR*942AE
2...SR*942AT/1…SR*942AE
2…SR*782AT/2…SR*812AT
Number of Refrigerant Circuits
2
2
2
2
Oil (oz) (Ckt 1, Ckt 2)
Precharged
Precharged
Precharged
Precharged
REFRIGERANT TYPE
R-22
Operating Charge (lb-oz)
Circuit 1
26-8
32-0
34-0
27-8
Circuit 2
14-0
17-0
19-0
29-0
CONDENSER COIL†
Cross-Hatched
3
/
8
″
Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
Quantity
1
1
1
1
Rows...Fins/in.
2...15
3...15
3...15
4...15
Total Face Area (sq ft)
33.3
33.3
33.3
33.3
CONDENSER FAN
Propeller Type
Nominal Cfm
17,200
15,850
15,850
14,500
Quantity...Diameter (in.)
2...30
2...30
2...30
2...30
Motor Hp
1
1
1
1
EVAPORATOR COIL
Cross-Hatched Copper Tubes, Aluminum Plate Fins
Tube Size (in.)
3
/
8
3
/
8
3
/
8
3
/
8
Rows...Fins/in.
3...15
3...15
4...15
4...5
Total Face Area (sq ft)
31.7
31.7
31.7
31.7
EVAPORATOR FAN
Centrifugal Type
Quantity...Size (in.)
2...20 X 15
2...20 X 15
2...20 X 15
2...20 X 15
Type Drive
Belt
Belt
Belt
Belt
Nominal Cfm
8,000
10,000
11,000
12,000
Motor Hp
5
10
15
5
10
15
10
15
20
10
15
20
Motor Frame Size
184T
215T
254T
184T
215T
254T
215T
254T
256T
215T
254T
256T
Motor Bearing Type
Ball
Ball
Ball
Ball
Maximum Allowable Rpm
1200
1200
1200
1200
Motor Pulley Pitch Diameter
4.8
4.4
5.7
4.8
6.1
5.5
4.4
4.9
5.9
4.4
5.7
5.9
Nominal Motor Shaft Diameter (in.)
1
1
/
8
1
3
/
8
1
5
/
8
1
1
/
8
1
3
/
8
1
5
/
8
1
3
/
8
1
5
/
8
1
5
/
8
1
3
/
8
1
5
/
8
1
5
/
8
Fan Pulley Pitch Diameter (in.)
12.4
8.6
9.1
12.4
11.1
8.7
9.4
8.1
8.7
9.5
9.1
8.7
Nominal Fan Shaft Diameter (in.)
1
15
/
16
1
15
/
16
1
15
/
16
1
15
/
16
Belt Quantity
1
1
2
1
1
2
2
2
2
2
2
2
Belt Type
BX56
BX50
5VX530
BX56
5VX570
5VX530
BX50
5VX530
5VX530
BX50
5VX530
5VX530
Belt Length (in.)
56
63
53
56
57
53
50
50
53
50
53
53
Pulley Center Line Distance (in.)
16.0-18.7
15.6-18.4
15.0-17.9
15.6-18.4
15.6-18.4
15.0-17.9
15.6-18.4
15.0-17.9
15.0-17.9
15.6-18.4
15.0-17.9
15.0-17.9
Factory Speed Setting (rpm)
717
924
1096
773
962
1106
848
1059
1187
856
1096
1187
HIGH-PRESSURE SWITCH (psig)
Cutout
426
426
426
426
Reset (Auto.)
320
320
320
320
RETURN-AIR FILTERS
Quantity...Size (in.) Standard
10...20 x 24 x 2
10...20 x 24 x 2
10...20 x 24 x 2
10...20 x 24 x 2
Pleated
5... 20 x 20 x 4
5...20 x 24 x 4
5...20 x 20 x 4
5...20 x 24 x 4
5...20 x 20 x 4
5...20 x 24 x 4
5...20 x 20 x 4
5...20 x 24 x 4
OUTDOOR-AIR FILTERS
Quantity...Size (in.)
8...16 x 25 x 2
4...20 x 25 x 2
POWER EXHAUST
Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan
Housing
Motor, Quantity...Hp
4...1
Fan, Diameter...Width (in.)
11 x 10
Al
—
Aluminum
Cu
—
Copper
Summary of Contents for 48AJ/AK/AMD020
Page 3: ...3 Fig 1 Roof Curb 50AJ AK020 035 Units...
Page 4: ...4 Fig 2 Roof Curb 50AJ AK040 050 Units...
Page 5: ...5 Fig 3 Roof Curb 50AJ AK060 Units...
Page 6: ...6 Fig 4 Reduced Supply Duct Opening Roof Curb 50AJ AK060 Units...
Page 7: ...7 Fig 5 Base Unit Dimensions 50AJ AK020 035...
Page 8: ...8 Fig 6 Base Unit Dimensions 50AJ AK040 050...
Page 10: ...10 Fig 8 Base Unit Dimensions 50AW AY020 035...
Page 11: ...11 Fig 9 Base Unit Dimensions 50AW AY040 050...
Page 32: ...32 CONTROLS OPTION BOARD Fig 19 Small Chassis Component Location Size 020 035 Units...
Page 33: ...33 CONTROLS OPTION BOARD Fig 20 Large Chassis Component Locations Size 040 060 Units...
Page 34: ...34 Fig 21 Typical Main Control Box Wiring Schematic TO NEXT PAGE TO NEXT PAGE...
Page 35: ...35 FROM PREVIOUS PAGE FROM PREVIOUS PAGE Fig 21 Typical Main Control Box Wiring Schematic cont...
Page 36: ...36 TO NEXT PAGE TO NEXT PAGE Fig 22 Auxiliary Control Box Wiring Schematic...
Page 38: ...38 Fig 23 Typical Power Schematic Size 060 Unit Shown...
Page 39: ...39 Fig 23 Typical Power Schematic Size 060 Unit Shown cont...
Page 40: ...40 Fig 24 Controls Option Wiring Schematic...
Page 41: ...41 Fig 25 Electric Heat Control Circuit Size 060 Unit Shown...
Page 47: ......