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Table 1 — Physical Data
LEGEND
*Indoor coil fin material/outdoor coil fin material.
†Weight of 14-in. roof curb.
**Requires an accessory or optional controls upgrade kit.
NOTE:
The 548D units have a loss-of-charge switch located in the liquid line avail-
able as an option or an accessory. (Standard on 120 units.)
UNIT SIZE 548D 090 102 120
NOMINAL CAPACITY (tons)
7
1
/
2
8
1
/
2
10
OPERATING WEIGHT (lb)
Unit
Al/Al*
940 965 1015
Economizer
Durablade
44 44 44
EconoMi$er
62 62 62
Roof Curb†
143 143 143
COMPRESSOR
Hermetic Scroll
Quantity
222
Oil (oz)
45 ea 62 ea 54 ea
REFRIGERANT TYPE
R-22
Operating Charge (lb-oz)
Circuit 1
5-14 8- 6 7-14
Circuit 2
5-13 8-13 8- 3
OUTDOOR COIL
Enhanced Copper Tubes, Aluminum Lanced Fins, Acutrol™ Feed Device
Rows...Fins/in.
1...17 2...17 2...17
Total Face Area (sq ft)
20.50 18.00 18.30
OUTDOOR FAN
Propeller Type
Nominal Cfm
6500 6500 6500
Quantity...Diameter (in.)
2...22 2...22 2...22
Motor Hp...Rpm
1
/
4
...1100
1
/
4
...1100
1
/
4
...1100
Watts Input (Total)
600 600 600
INDOOR COIL
Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Acutrol Fixed Orifice Metering Feed Device
Rows...Fins/in.
3...15 3...15 3...15
Total Face Area (sq ft)
8.0 8.0 11.1
INDOOR FAN
Centrifugal Type
Quantity...Size (in.) Std
1...15 x 15 1...15 x 15 1...15 x 15
Alt
1...15 x 15 — 1...15 x 15
Type Drive Std
Belt Belt Belt
Alt
Belt — Belt
Nominal Cfm
3000 3600 4000
Maximum Continuous Bhp Std
2.40 2.40 2.40
Alt
——2.90
Motor Frame Size Std
56 56 56
Alt
——56
Nominal Rpm High/Low Std
———
Alt
———
Fan Rpm Range Std
590-840 685-935 685- 935
Alt
685-935 — 835-1085
Motor Bearing Type
Ball Ball Ball
Maximum Allowable Rpm
2100 2100 2100
Motor Pulley Pitch Diameter Min/Max (in.) Std
2.4/3.4 2.8/3.8 2.8/3.8
Alt
2.8/3.8 — 3.4/4.4
Nominal Motor Shaft Diameter (in.) Std
5
/
8
5
/
8
5
/
8
Alt
—
—
7
/
8
Fan Pulley Pitch Diameter (in.) Std
7.0 7.0 7.0
Alt
7.0 — 7.0
Belt, Quantity...Type...Length (in.) Std
1...A...48 1...A...48 1...A...48
Alt
1...A...48 — 1...A...48
Pulley Center Line Distance (in.) Std
16.75-19.25 16.75-19.25 15.85-17.50
Alt
15.75-19.25 — 15.85-17.50
Speed Change per Full Turn of
Movable Pulley Flange (rpm) Std
50 50 50
Alt
50 — 50
Movable Pulley Maximum Full Turns
From Closed Position Std
555
Alt
5—5
Factory Setting Std
555
Alt
5—5
Factory Speed Setting (rpm) Std
590 685 685
Alt
685 — 835
Fan Shaft Diameter at Pulley (in.)
111
HIGH-PRESSURE SWITCH (psig)**
Standard Compressor Internal Relief (Differential)
450 ± 50
Cutout
428
Reset (Auto.)
320
LOSS-OF-CHARGE SWITCH (psig)**
Cutout
7 ± 3
Reset (Auto.)
22 ± 5
FREEZE-PROTECTION THERMOSTAT (F)**
Opens
30 ± 5
Closes
45 ± 5
OUTDOOR-AIR INLET SCREENS
Cleanable
Quantity...Size (in.)
1...20 x 25 x 1
1...16 x 25 x 1
RETURN-AIR FILTERS
Throwaway
Quantity...Size (in.)
4...16 x 20 x 2 4...16 x 20 x 2 4...20 x 20 x 2
Al —
Aluminum
Bhp —
Brake Horsepower