90A or residence-type, NFPA 90B; and/or local codes and
ordinances.
Adhere to the following criteria when selecting, sizing, and
installing the duct system:
8. Units are shipped for side shot installation.
9. Select and size ductwork, supply-air registers, and return-air
grilles according to American Society of Heating, Refrigera-
tion and Air Conditioning Engineers (ASHRAE) recommen-
dations.
10. Use flexible transition between rigid ductwork and unit to
prevent transmission of vibration. The transition may be
screwed or bolted to duct flanges. Use suitable gaskets to
ensure weathertight and airtight seal.
11. All units must have field-supplied filters or accessory filter
rack installed in the return-air side of the unit. Recommended
sizes for filters are shown in Tables 1 and 2.
12. Size all ductwork for maximum required airflow (either
heating or cooling) for unit being installed. Avoid abrupt duct
size increases or decreases or performance may be affected.
13. Adequately insulate and weatherproof all ductwork located
outdoors. Insulate ducts passing through unconditioned space,
and use vapor barrier in accordance with latest issue of Sheet
Table 1—Physical Data—Unit 50GS
UNIT SIZE 018 024 030 036 042 048 060
NOMINAL CAPACITY (ton) 1-1/2 2 2-1/2 3 3-1/2 4 5
OPERATING WEIGHT (lb.) 254 260 258 268 294 324 389
COMPRESSOR Reciprocating Scroll Reciprocating
REFRIGERANT (R-22)
Quantity (lb.)
2.6 3.5 3.65 4.4 6.4 5.1 7.4
REFRIGERANT METERING DEVICE
Orifice ID (in.)
Accurater
.034 .034 .034 .032 .034 .032 .030
CONDENSER COIL
Rows...Fins/in.
Face Area (sq. ft.)
1...17
6.1
1...17
9.1
1...17
9.1
1...17
10.9
1...17
9.1
1...17
12.3
2...17
12.3
CONDENSER FAN
Nominal Cfm
Diameter
Motor Hp (Rpm)
2000
22
1/8 (825)
2400
22
1/8 (825)
2400
22
1/8 (825)
3000
18
1/4 (1100)
3000
22
1/4 (1100)
3600
22
1/4 (1100)
3600
22
1/4 (1100)
EVAPORATOR COIL
Rows...Fins/in.
Face Area (sq. ft.)
2...15
3.1
2...15
3.1
2...15
3.7
3...15
3.06
4...15
3.06
3...15
4.7
4...15
4.7
EVAPORATOR BLOWER
Nominal Airflow (Cfm)
Size (in.)
Motor HP (RPM)
600
10x10
1/4 (825)
800
10x10
1/4 (1075)
1000
10x10
1/4 (1075)
1200
11x10
1/2 (1075)
1400
11x10
3/4 (1075)
1600
11x10
3/4 (1075)
2000
11x10
1.0 (1100)
RETURN-AIR FILTERS (in.)*
Throwaway
20x20 20x20 20x20 20x24 20x24 24x30 24x30
* Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300
ft./min. for throwaway type or 450 ft./min. for high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
Table 2—Physical Data—Unit 50GX
UNIT SIZE 024 030 036 042 048 060
NOMINAL CAPACITY (ton) 2 2-1/2 3 3-1/2 4 5
OPERATING WEIGHT (lb.) 270 291 299 321 326 399
COMPRESSOR Scroll
REFRIGERANT (R-22)
Quantity (lb.)
3.7 4.4 5.2 7.6 8.3 8.1
REFRIGERANT METERING DEVICE
Orifice ID (in.)
Accurater
.034 .030 .032 .034 .034 .032
CONDENSER COIL
Rows...Fins/in.
Face Area (sq. ft.)
1...17
10.8
1...17
12.7
2...17
9.1
2...17
9.1
2...17
12.3
2...17
16.4
CONDENSER FAN
Nominal Cfm
Diameter (in.)
Motor Hp (Rpm)
2350
22
1/8 (825)
2350
22
1/8 (825)
2350
22
1/8 (825)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
EVAPORATOR COIL
Rows...Fins/in.
Face Area (sq. ft.)
3...15
3.1
3...15
3.1
3...15
3.7
3...15
4.7
4...15
4.7
4...15
4.7
EVAPORATOR BLOWER
Nominal Airflow (Cfm)
Size (in.)
Motor Hp (RPM)
800
10x10
1/4 (1075)
1000
10x10
1/4 (1075)
1200
11x10
1/2 (1075)
1400
11x10
3/4 (1075)
1600
11x10
3/4 (1075)
1750
11x10
1.0 (1040)
RETURN-AIR FILTERS (in.)*
Throwaway
20x20 20x20 20x24 20x30 24x30 24x30
*
Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300
ft./min. for throwaway type or 450 ft./min. for high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
8
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