Carrier SINGLE PACKAGE ROOFTOP UNITS 48PG20-28 - Manual (Page 6)

6
Table 1 — Physical Data
LEGEND
*Aluminum evaporator coil/aluminum condenser coil.
UNIT 48PG 20 24 28
VOLTAGE 208/230 and 460 575 208/230 and 460 575 208/230 and 460 575
NOMINAL CAPACITY (Tons) 18 18 20 20 25 25
OPERATING WEIGHT (lb)
48 Series (Low Heat) Al/Al* 2480 2480 2588 2588 2773 2773
COMPRESSOR Fully Hermetic Scroll
Quantity 2 2 2 2 3 3
Number of Refrigerant Circuits 2 2 2 2 2 2
Oil (ounces) Comp A1, A2, B1 85, NA, 85 85, NA, 85 85, NA, 85 85, NA, 85 85, 85, 85 85, 85, 85
REFRIGERANT TYPE Puron® Refrigerant (R-410A)
Expansion Device TXV TXV TXV TXV TXV TXV
Change Type
Operating Charge (lb)
Circuit A 25.3 25.3 35.7 35.7 49.3 49.3
Circuit B 25.3 25.3 33.5 33.5 24.3 24.3
REFRIGERANT SUBCOOLER
Heat Exchanger Size B15Hx26x26 B15Hx26x26 B15Hx26x26 B15Hx26x26 B15Hx26x36 B15Hx26x36
Expansion Device TXV TXV TXV TXV TXV TXV
CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced Fins
Rows...Fins/inch 2...17 2...17 3...17 3...17 3...17 3...17
Quantity 2 2 3 3 3 3
Length of Tube Sheets (in.) 80.3 80.3 80.3 80.3 80.3 80.3
Width (in.) 60 60 60 60 60 60
Total Face area (sq. ft) 33.46 33.46 33.46 33.46 33.46 33.46
CONDENSER FAN Propeller
Nominal Cfm (Total, all fans) 14,000 14,000 21,000 21,000 21,000 21,000
Quantity...Diameter (in.) 4...22 4...22 6...22 6...22 6...22 6...22
Motor Hp...Rpm 1 / 4 ...1100 1 / 4 ...1100 1 / 4 ...1100 1 / 4 ...1100 1 / 4 ...1100 1 / 4 ...1100
Watts input (Total) 1400 1400 2100 2100 2100 2100
EVAPORATOR COIL Enhanced Copper Tubes, Face Split, Aluminum Double-Wavy Fins
Rows...Fins/inch 4...15 4...15 4...15 4...15 4...15 4...15
Length of Tube Sheets (in.) 69.4 69.4 69.4 69.4 69.4 69.4
Width (in.) 48 48 48 48 60 60
Total Face area (sq ft) 23.13 23.13 23.13 23.13 28.92 28.92
EVAPORATOR FAN Centrifugal, Belt Type
Quantity...Size (in.) 2...15 x 11 2...15 x 11 2...15 x 11 2...15 x 11 2...15 x 11 2...15 x 11
Type Drive Belt Belt Belt Belt Belt Belt
Nominal Cfm 7000 7000 8000 8000 10,000 10,000
Motor Bearing Type Ball Ball Ball Ball Ball Ball
Maximum Allowable Fan Rpm 1400 1400 1400 1400 1400 1400
FURNACE SECTION
Rollout Switch Cutout Temp (F) Vertical 225 225 225 225 225 225
Burner Orifice Diameter (in. ...drill size) 0.136 ...29 0.136 ...29 0.136 ...29 0.136 ...29 0.136 ...29 0.136 ...29
Gas Natural Natural Natural Natural Natural Natural
Thermostat Heat Anticipator Setting
Stage 1 (amps) 0.98 0.98 0.98 0.98 0.98 0.98
Stage 2 (amps) 0.44 0.44 0.44 0.44 0.44 0.44
Gas Input (Btuh) HIGH HEAT Stage 1 317,000 317,000 317,000 317,000 317,000 317,000
Stage 2 400,000 400,000 400,000 400,000 400,000 400,000
Efficiency (Steady State) % Vertical 82 82 82 82 82 82
Temperature Rise Range 25-55 25-55 25-55 25-55 25-55 25-55
Gas Input (Btuh) MEDIUM HEAT Stage 1 281,000 281,000 281,000 281,000 281,000 281,000
Stage 2 365,000 365,000 365,000 365,000 365,000 365,000
Efficiency (Steady State) % Vertical 81 81 81 81 81 81
Temperature Rise Range 25-55 25-55 25-55 25-55 25-55 25-55
Gas Input (Btuh) LOW HEAT Stage 1 199,000 199,000 199,000 199,000 199,000 199,000
Stage 2 250,000 250,000 250,000 250,000 250,000 250,000
Efficiency (Steady State) % Vertical 82 82 82 82 82 82
Temperature Rise Range 15-45 15-45 15-45 15-45 15-45 15-45
Manifold Pressure
Natural Gas (in. wg) Vertical 3.00 3.00 3.00 3.00 3.00 3.00
Natural Gas (in. wg) Horizontal 2.95 2.95 2.95 2.95 2.95 2.95
Gas Valve Quantity 1 1 1 1 1 1
Gas Valve Pressure Range (in. wg) 5.5-13.0 5.5-13.0 5.5-13.0 5.5-13.0 5.5-13.0 5.5-13.0
Min-Max Allowable (psig) .235-.469 .235-.469 .235-.469 .235-.469 .235-.469 .235-.469
Field Gas Connection Size (in...FPT) 3 / 4 3 / 4 3 / 4 3 / 4 3 / 4 3 / 4
HIGH-PRESSURE SWITCHES (psig)
Cutout 630 ± 10 630 ± 10 630 ± 10 630 ± 10 630 ± 10 630 ± 10
Reset (Auto) 505 ± 20 505 ± 20 505 ± 20 505 ± 20 505 ± 20 505 ± 20
OUTDOOR AIR INLET SCREENS
Quantity...Size (in.) 3...20 x 25 3...20 x 25 3...20 x 25 3...20 x 25 3...20 x 25 3...20 x 25
RETURN-AIR FILTERS
Quantity...Size (in.) 9...16 x 25 x 2 9...16 x 25 x 2 9...16 x 25 x 2 9...16 x 25 x 2 9...20 x 25 x 2 9...20 x 25 x 2
TXV — Thermostatic Expansion Valve