Carrier 48N Instrukcja Użytkownika Pobierz pdf (Strona 11)

TWO-STAGE GAS HEATING CAPACITIES - 48N UNITS

(Natural Gas on All Units)

NOTES:

1. Ratings are approved for altitudes to 2000 ft. At altitudes over

2000 ft, ratings are 4% less for each 1000 ft above sea level.

2. At altitudes up to 2000 ft, the following formula may be used to calcu-

late air temperature rise:

3. At altitudes above 2000 ft, the following formula may be used:

4. Minimum allowable temperature of mixed air entering the heat

exchanger during half-rate (first stage) operation is 35 F. There is no

minimum mixture temperature limitation during full-rate operation.

5. Temperature rise limits: see table.

6. On VAV (variable air volume) applications set the zone terminals to

provide minimum unit heating airflow as indicated in the table upon

command from Heat Interlock Relay (HIR) function.

UNIT SIZE

(NOMINAL CAPACITY, TONS)

NOMINAL

CAPACITY

GAS INPUT

(1000 Btuh)

EFFICIENCY

(%)

OUTPUT CAPACITY

(1000 Btuh)

TEMP

RISE (F)

AIRFLOW (Cfm)

Stage 1 Stage 2 Stage 1 Stage 2 Min Max

(75)

75 Low Heat 600 800 81 486 648 10-40 15,000 37,500

75 High Heat 900 1200 81 729 972 20-50 15,000 37,500

(90)

90 Low Heat 600 800 81 486 648 10-40 18,000 45,000

90 Medium Heat 900 1200 81 729 972 20-50 18,000 45,000

90 High Heat 1200 1600 81 972 1296 25-65 18,000 45,000

(105)

105 Low Heat 600 800 81 486 648 10-40 21,000 52,500

105 Medium Heat 900 1200 81 729 972 20-50 21,000 52,500

105 High Heat 1200 1600 81 972 1296 25-65 21,000 52,500

(120)

120 Low Heat 900 1200 81 729 972 15-45 24,000 60,000

120 Medium Heat 1200 1600 81 972 1296 20-50 24,000 60,000

120 High Heat 1500 2000 81 1215 1620 25-55 24,000 60,000

(130)

130 Low Heat 900 1200 81 729 972 15-45 26,000 60,000

130 Medium Heat 1200 1600 81 972 1296 20-50 26,000 60,000

130 High Heat 1500 2000 81 1215 1620 25-55 26,000 60,000

(150)

150 Low Heat 900 1200 81 729 972 15-45 30,000 60,000

150 Medium Heat 1200 1600 81 972 1296 20-50 30,000 60,000

150 High Heat 1500 2000 81 1215 1620 25-55 30,000 60,000

't =

maximum output capacity

1.10 x air quantity

't =

maximum output capacity

(.24 x specific weight of air x 60) (air quantity)

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 91 92

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