Carrier 50HQ User Manual download pdf (Page 14)

50HQP072

2400 CFM NOMINAL AIRFLOW

LEGEND NOTES:

1. Interpolation is permissible, extrapolation is not.

2. All entering air conditions are 80 F db (dry bulb) and 67 F wb (wet bulb) in

cooling and 70 F db in heating.

3. AHRI/ISO certified conditions are 80.6 F db and 66.2 F wb in cooling and

68 F db in heating.

4. Table does not reflect fan or pump power corrections for AHRI/ISO condi-

tions.

5. All performance data is based upon the lower voltage of dual voltage rated

units.

6. Performance stated is at the rated power supply. Performance may vary as

the power supply varies from the rated voltage.

7. Operation below 60 F EWT requires optional insulated water circuit.

8. Operation below 40 F EWT is based upon 15% methanol antifreeze solu-

tion.

9. See Correction Factor tables for operating conditions other than those listed

above.

10. Performance capacities shown in MBtuh.

OPERATION IN SHADED AREAS

For operation in the shaded area when water is used in lieu of an anti-freeze solu-

tion, the LWT (Leaving Water Temperature) must be calculated. Flow must be

maintained to a level such that the LWT is maintained above 42 F [5.6 C] when

operating in the standard range. This is due to the potential of the refrigerant tem-

perature being as low as 32 F [0° C] with 40 F [4.4 C] LWT, which may lead to a

nuisance cutout due to the activation of the Low Temperature Protection.

Example:

At 50 F EWT (Entering Water Temperature) and 15 gpm, a 50HQP072 unit has a

THA of 57,800 Btuh. To calculate LWT, rearrange the formula for THA as follows:

THA = TD x GPM x 500, where THA = Total Heat of Absoption (Btuh); TD = tem-

perature difference (EWT - LWT) and GPM = U.S. Gallons per Minute.

TD = THA / (GPM x 500)

TD = 57,800 / (15 x 500)

TD = 8 F

LWT = EWT - TD

LWT = 50 - 8 = 42 F

In this example, a higher flow rate will be required for EWTs at or below 50 F with-

out antifreeze.

EWT (F) GPM

PRESSURE DROP COOLING CAPACITY HEATING CAPACITY

PSIG

TC TSC kW THR EER HC kW THA LAT COP

20 20 6.8 15.8 Operation Not Recommended

49.5 5.0 32.5 87.1 2.9

10 1.2 2.7 82.3 56.8 3.6 94.5 23.0

54.7 5.0 37.5 89.0 3.2

15 3.3 7.7 81.1 55.8 3.4 92.8 23.6 56.8 5.1 39.6 89.9 3.3

20 6.2 14.3 80.2 55.1 3.4 91.7 23.8

58.0 5.1 40.7 90.3 3.4

10 1.0 2.2 82.4 57.4 3.9 95.6 21.2

63.2 5.1 45.6 92.3 3.6

15 3.0 7.0 82.6 57.1 3.7 95.1 22.4 66.1 5.2 48.4 93.4 3.7

20 5.6 13.0 82.4 56.8 3.6 94.6 22.9

67.7 5.2 50.0 94.1 3.8

10 0.9 2.0 80.7 57.2 4.2 95.1 19.0

72.3 5.3 54.4 95.8 4.0

15 2.8 6.5 81.9 57.4 4.0 95.6 20.5 76.0 5.3 57.8 97.2 4.2

20 5.3 12.2 82.3 57.4 3.9 95.6 21.1

78.0 5.4 59.7 98.0 4.3

10 0.5 1.2 77.7 56.3 4.7 93.6 16.7 81.8 5.4 63.3 99.5 4.4

15 2.2 5.1 79.7 56.9 4.4 94.7 18.2 86.0 5.5 67.2 101.1 4.6

20 4.4 10.1 80.6 57.2 4.3 95.1 18.9 88.3 5.5 69.4 102.0 4.7

10 0.5 1.1 73.9 54.9 5.2 91.4 14.3 91.1 5.6 72.0 103.1 4.8

15 2.1 4.8 76.3 55.8 4.8 92.8 15.8 95.6 5.7 76.3 104.8 4.9

20 4.2 9.6 77.5 56.2 4.69 93.5 16.5 98.0 5.7 78.5 105.7 5.0

10 0.4 0.9 69.4 53.1 5.71 88.9 12.2 99.8 5.880.2 106.4 5.1

15 1.9 4.5 72.2 54.2 5.37 90.5 13.4 104.4 5.9 84.4 108.2 5.2

20 3.9 9.1 73.5 54.7 5.20 91.2 14.1 106.7 5.9 86.5 109.1 5.3

10 0.4 0.8 67.1 52.1 6.03 87.7 11.2 103.7 5.883.8 107.9 5.2

15 1.9 4.4 69.8 53.3 5.66 89.2 12.4 108.0 5.9 87.8 109.6 5.3

20 3.9 8.9 71.2 53.8 5.49 8 9.9 13.0 110.1 6.0 89.7 110.4 5.4

10 0.3 0.8 64.8 51.2 6.35 86.4 10.2 107.6 5.9 87.4 109.4 5.3

15 1.8 4.3 67.5 52.3 5.96

87.9 11.3 111.7 6.0 91.1 111.0 5.4

20 3.88.8 68.9 52.9 5.7888.6 11.9 113.5 6.0 92.8 111.7 5.5

100

10 0.3 0.7 60.1 49.2 7.06 84.2 8.5

Operation Not Recommended

15 1.8 4.1 62.7 50.3 6.64 85.4 9.4

20 3.7 8.5 64.1 50.9 6.44 86.1 10.0

110

10 0.2 0.6 55.8 47.5 7.87 82.7 7.1

15 1.7 3.9 58.1 48.4 7.41 83.4 7.8

20 3.6 8.3 59.4 48.9 7.19 83.9 8.3

120

10 0.2 0.5 52.2 46.3 8.7882.2 5.9

15 1.6 3.7 54.1 46.9 8.27 82.3 6.5

20 3.5 8.0 55.1 47.3 8.02 82.5 6.9

See below

COP — Coefficient of Performance

EER — Energy Efficiency Ratio

EWT — Entering Water Temperature

GPM — Gallons Per Minute

HC — Heating Capacity

kW — Total Power (Kilowatts)

LAT — Leaving Air Temperature

MBtuh — Btuh in Thousands

TC — Total Capacity (MBtuh)

THA — Total Heat of Absorption (MBtuh)

THR — Total Heat of Rejection (MBtuh)

TSC — Total Sensible Capacity (MBtuh)

Performance data (cont)

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 33 34

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Carrier 50HQ User Manual Page 14

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