27
50PEC15 — NOMINAL AIRFLOW 520 CFM
LEGEND NOTES:
1. Interpolation is permissible; extrapolation is not.
2. All entering air conditions are 80 F db and 67 F wb in cooling and
70 F db in heating.
3. ARI/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 ARI/ISO
conditions.
5. All performance is based upon the lower voltage of dual voltage rated
units.
6. Operation below 40 F EWT is based upon a 15% antifreeze solution.
7. Operation below 60 F EWT requires optional insulated water/refriger-
ant circuit (standard on residential models).
8. See performance correction tables for operating conditions other than
those listed above.
9. For operation in the shaded area when water is used instead of an anti-
freeze solution, the LWT must be calculated. Flow must be maintained
to a level so that the LWT is maintained above 42 F when the JW3
jumper is not clipped. Because the refrigerant temperature can poten-
tially reach as low as 32 F with 40 F LWT, a nuisance cutout could
occur due to the activation of the low temperature protection. JW3
should never be clipped for standard range equipment or systems with-
out antifreeze.
EWT (F) GPM
WPD* COOLING - EAT 80/67 F HEATING - EAT 70 F
PSI FT TC SC
Sensible/
Total
Ratio
kW HR EER HC kW HE LAT COP
20 3.7 5.1 11.8 Operation Not Recommended 8.9 0.92 5.8 85.9 2.86
30
1.9 1.5 3.5 16.9 11.0 0.65 0.62 19.0 27.1 10.0 0.94 6.8 87.8 3.11
2.8 3.0 6.9 16.5 10.4 0.63 0.58 18.5 28.6 10.5 0.95 7.2 88.6 3.22
3.7 4.7 10.9 16.3 10.1 0.62 0.56 18.2 29.2 10.7 0.96 7.5 89.1 3.28
40
1.9 1.2 2.8 16.9 11.4 0.67 0.70 19.3 24.1 11.7 0.98 8.4 90.8 3.51
2.3 4.2 9.7 12.6 8.2 0.65 0.58 14.6 21.9 9.9 0.83 7.1 90.4 3.48
3.7 4.3 9.9 16.9 11.0 0.65 0.62 19.0 27.1 12.6 0.99 9.2 92.4 3.71
50
1.9 1.0 2.3 16.6 11.5 0.69 0.79 19.3 21.0 13.4 1.01 10.0 93.9 3.91
2.8 2.3 5.3 16.9 11.5 0.68 0.73 19.4 23.1 14.1 1.02 10.7 95.2 4.06
3.7 3.9 9.0 16.9 11.4 0.67 0.70 19.3 24.2 14.5 1.03 11.0 95.9 4.15
60
1.9 0.9 2.1 15.9 11.3 0.71 0.89 18.9 17.9 15.2 1.04 11.7 97.1 4.29
2.8 2.1 4.9 16.4 11.4 0.70 0.82 19.2 19.9 16.0 1.05 12.4 98.5 4.46
3.7 3.5 8.1 16.6 11.5 0.69 0.79 19.3 21.0 16.4 1.06 12.8 99.3 4.56
70
1.9 0.9 2.1 15.0 10.9 0.73 0.99 18.4 15.2 16.9 1.06 13.3 100.1 4.66
2.8 2.0 4.6 15.6 11.2 0.72 0.92 18.8 16.9 17.8 1.08 14.1 101.6 4.84
3.7 3.3 7.6 15.9 11.3 0.71 0.89 18.9 17.9 18.2 1.08 14.5 102.5 4.93
80
1.9 0.9 2.1 14.0 10.5 0.75 1.10 17.8 12.7 18.5 1.09 14.8 103.0 4.99
2.8 1.8 4.2 14.6 10.8 0.74 1.03 18.2 14.2 19.4 1.10 15.6 104.5 5.17
3.7 3.1 7.2 15.0 10.9 0.73 1.00 18.4 15.0 19.8 1.10 16.1 105.3 5.26
85
1.9 0.9 2.0 13.4 10.3 0.77 1.16 17.4 11.6 19.2 1.10 15.5 104.3 5.14
2.8 1.8 4.0 14.1 10.5 0.75 1.09 17.8 13.0 20.1 1.11 16.3 105.8 5.31
3.7 3.0 6.9 14.4 10.7 0.74 1.05 18.0 13.8 20.5 1.11 16.7 106.5 5.40
90
1.9 0.8 1.8 12.9 10.0 0.78 1.22 17.0 10.5 20.0 1.11 16.2 105.6 5.29
2.8 1.7 3.9 13.5 10.3 0.76 1.15 17.5 11.8 20.8 1.12 17.0 107.0 5.45
3.7 2.9 6.7 13.9 10.5 0.75 1.11 17.7 12.5 21.2 1.12 17.3 107.7 5.53
100
1.9 0.8 1.8 11.7 9.6 0.82 1.35 16.3 8.7
Operation Not Recommended
2.8 1.6 3.7 12.4 9.8 0.80 1.27 16.7 9.7
3.7 2.8 6.5 12.7 10.0 0.78 1.23 17.0 10.3
110
1.9 0.8 1.8 10.6 9.2 0.87 1.48 15.7 7.2
2.8 1.6 3.7 11.2 9.4 0.84 1.40 16.0 8.0
3.7 2.7 6.2 11.5 9.5 0.83 1.37 16.2 8.4
120
1.9 0.7 1.6 9.6 9.0 0.94 1.62 15.1 5.9
2.8 1.5 3.5 10.1 9.1 0.90 1.54 15.4 6.5
3.7 2.7 6.2 10.4 9.2 0.88 1.51 15.5 6.9
ARI — Air Conditioning and Refrigeration Institute
db — Dry Bulb
COP — Coefficient of Performance
Cv — Coefficient of Velocity
EAT — Entering Air Temperature (F)
EER — Energy Efficiency Ratio
EWT — Entering Water Temperature (F)
GPM — Gallons per Minute
HC — Heating Capacity (MBtuh)
HE — Heat of Extraction (MBtuh)
HR — Heat of Rejection (MBtuh)
ISO — International Organization for Standardization
LAT — Latent Heat (MBtuh)
LWT — Leaving Water Temperature
MBtuh — Btuh in Thousands
MOPD — Maximum Opening Pressure Difference
SC — Sensible Capacity (MBtuh)
TC — Total Capacity (MBtuh)
wb — Wet Bulb
WPD — Water Pressure Differential
*WPD ADDER FOR MOTORIZED VALVE, 50PEC15 UNIT
(Cv = 4.9, MOPD = 125 psi)
GPM
WPD Adder
PSI FT
1.9 0.7 1.7
2.3 1.7 4.0
3.7 3.3 7.6
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