17
Table 1 — Physical Data — 50A Units
LEGEND
*Sizes 020 to 027: Circuit 1 uses the lower portion of condenser coil,
Circuit 2 uses the upper portion.
Sizes 030 and 035: Circuit 1 uses the upper portion of condenser coil,
Circuit 2 uses the lower portion.
Sizes 040 and 050: Circuit 1 uses the left condenser coil, Circuit 2 the right.
Size 060: Circuit A uses the two MCHX coils near the bulkhead, Circuit B
uses the two MCHX coils near the control box.
UNIT 50A
020
025
027
030
NOMINAL CAPACITY (tons)
20
25
27
30
BASE UNIT
See Unit Weights Table
OPERATING WEIGHT (lb)
COMPRESSOR
Quantity ... Type (Ckt 1/Ckt 2)
2 ... ZP67/1…ZP91
2 ... ZP91/1…ZP91
2 ... ZP91/1…ZP91
2…ZP72, 2…ZP72
Number of Refrigerant Circuits
2
2
2
2
Oil
Precharged
Precharged
Precharged
Precharged
REFRIGERANT
R-410A
Operating Charge (lb), Ckt 1/Ckt 2
RTPF Coils
26.2/18.8
30.2/15.2
32.8/16.5
30.5/34.3
MCHX Coils
14.9/11.8
16.5/11.0
16.5/11.0
15.1/15.3
MCHX Coils with Humidi-MiZer
®
Coil
22.1/11.8
23.7/11.0
23.7/11.0
15.1/22.5
MCHX CONDENSER*
Quantity
1
1
1
1
Total Face Area (sq ft)
32.9
32.9
32.9
32.9
RTPF CONDENSER
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
19,500
19,500
19,500
19,500
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 with Intertwined Circuits
Tube Size (in.)
3
/
8
3
/
8
3
/
8
3
/
8
Rows ... Fins/in.
3 ... 15
4 ... 14
4 ... 15
4 ... 15
Total Face Area (sq ft)
31.7
31.7
31.7
31.7
HUMIDI-MIZER COIL
Quantity
1
1
1
1
Face Area (sq ft)
14.4
14.4
14.4
14.4
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 (in.)
4.8
4.4
5.7
5.2
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
9.0
9.1
8.7
Nominal Fan Shaft Diameter (in.)
1
15
/
16
1
15
/
16
1
15
/
16
1
15
/
16
Belt Quantity
1
2
2
1
1
2
2
2
2
2
2
2
Belt Type
BX56
BX50
5VX530
BX56
5VX570 5VX530
BX50
5VX500
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
650
650
650
650
Reset (Auto.)
500
500
500
500
MIXED-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
MCHX—
Microchannel Heat Exchanger
RTPF —
Round Tube Plate Fin
