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Performance
Data
UNT-PRC001-EN20
Two-Pipe
Coils
ARI cooling performance is based on 80/67 F (27/19 C) entering air temperature, 45 F (7 C) entering chilled water temperature with a
10 F (5.5 C) DT.
Heating performance is based on 70 F (21 C) entering air temperature, 180 F (82 C) entering hot water temperature with a
30 F (17 C) DT.
All performance measured on high speed tap, 115 V, zero ESP, with a throwaway filter. See page 18 for performance groupings.
Table PD-4. Free Discharge Motor, Two-Pipe, Group 3
Cooling Heating
CFM TMBH SMBH GPM WPD TMBH GPM WPD 115V 230V 277V
FC Coil (L/s) (TkW) (SkW) (L/s) (kPa) (TkW) Q/ITD (L/s) (kPa) Watt Watt Watt
2 2CH 198 (93) 4.8 (1.4) 3.7 (1.1) 1.00 (0.06) 5.7 (17.1) 13.8 (4.1) .13 0.92 (0.06) 3.8 (11.3) 60 95 65
3CH 188 (90) 6.5 (1.9) 4.5 (1.3) 1.34 (0.08) 14.4 (43.1) 16.7 (4.9) .15 1.11 (0.07) 8.0 (23.8) 60 95 65
4CH 177 (84) 6.5 (1.9) 4.5 (1.3) 1.34 (0.08) 3.5 (10.4) 17.3 (5.1) .16 1.16 (0.07) 2.2 (6.4) 60 95 65
3 2CH 262 (124) 6.1 (1.8) 4.6 (1.3) 1.28 (0.08) 9.7 (29.1) 18.3 (5.4) .17 1.22 (0.08) 6.9 (20.6) 70 80 83
3CH 260 (123) 7.3 (2.1) 5.4 (1.6) 1.51 (0.10) 3.7 (11.1) 22.1 (6.5) .20 1.47 (0.09) 2.9 (8.7) 85 89 101
4CH 242 (114) 8.8 (2.6) 6.0 (1.8) 1.82 (0.11) 6.6 (19.6) 23.7 (6.9) .22 1.58 (0.10) 4.1 (12.3) 85 89 101
4 2CH 330 (156) 7.8 (2.3) 6.2 (1.8) 1.63 (0.10) 3.5 (10.4) 22.8 (6.7) .21 1.52 (0.10) 2.6 (7.7) 95 96 104
3CH 320 (151) 10.6 (3.1) 7.4 (2.2) 2.19 (0.14) 8.2 (24.5) 28.1 (8.2) .26 1.87 (0.12) 5.1 (15.2) 100 107 106
4CH 304 (144) 12.0 (3.5) 8.0 (2.3) 2.47 (0.16) 12.9 (38.7) 30.3 (8.9) .28 2.02 (0.13) 7.3 (21.9) 100 107 106
6 2CH 512 (242) 13.5 (4.0) 10.0 (2.9) 2.77 (0.17) 11.0 (32.9) 35.8 (10.5) .33 2.38 (0.15) 7.0 (21.0) 110 154 165
3CH 508 (240) 14.9 (4.4) 11.1 (3.3) 3.07 (0.19) 4.1 (12.3) 43.3 (12.7) .39 2.88 (0.18) 3.3 (9.7) 125 130 124
4CH 483 (228) 17.7 (5.2) 12.1 (3.5) 3.62 (0.23) 6.6 (19.7) 47.2 (13.8) .43 3.14 (0.20) 4.4 (13.3) 125 130 124
8 2CH 665 (314) 14.7 (4.3) 11.9 (3.5) 3.04 (0.19) 3.6 (10.6) 45.0 (13.2) .41 3.00 (0.19) 3.2 (9.4) 135 150 159
3CH 623 (294) 19.1 (5.6) 13.5 (4.0) 3.90 (0.25) 7.1 (21.2) 54.3 (15.9) .49 3.62 (0.23) 5.5 (16.3) 120 123 133
4CH 596 (282) 21.2 (6.2) 14.3 (4.2) 4.32 (0.27) 10.3 (30.7) 59.2 (17.3) .54 3.94 (0.25) 7.5 (22.4) 120 123 133
10 2CH 829 (391) 20.5 (6.0) 15.7 (4.6) 4.25 (0.27) 7.3 (21.8) 57.5 (16.9) .52 3.83 (0.24) 5.5 (16.3) 205 250 269
3CH 835 (394) 26.4 (7.7) 18.4 (5.4) 5.43 (0.34) 14.6 (43.7) 72.9 (21.3) .66 4.86 (0.31) 10.5 (31.2) 225 237 230
4CH 796 (376) 27.9 (8.2) 18.6 (5.4) 5.73 (0.36) 19.5 (58.3) 79.0 (23.1) .72 5.26 (0.33) 14.4 (42.9) 225 237 230
12 2CH 940 (444) 24.9 (7.3) 18.4 (5.4) 5.13 (0.32) 11.1 (33.3) 66.5 (19.5) .60 4.43 (0.28) 7.6 (22.8) 230 246 263
3CH 923 (436) 29.1 (8.5) 20.6 (6.0) 5.96 (0.38) 10.6 (31.7) 80.6 (23.6) .73 5.37 (0.34) 8.2 (24.6) 220 230 239
4CH 876 (413) 34.5 (10.1) 22.5 (6.6) 7.04 (0.44) 14.7 (44.0) 87.9 (25.8) .80 5.86 (0.37) 9.4 (28.2) 220 230 239
Table PD-5. Free Discharge Motor, Two-Pipe, Group 4
Cooling Heating
CFM TMBH SMBH GPM WPD TMBH GPM WPD 115V
FC Coil (L/s) (TkW) (SkW) (L/s) (kPa) (TkW) Q/ITD (L/s) (kPa) Watt
3 2CH 300 (142) 6.8 (2.0) 5.4 (1.6) 1.36 (0.09) 2.5 (7.5) 21.2 (6.2) .19 1.41 (0.09) 2.3 (6.7) 86
3CH 270 (128) 7.8 (2.3) 5.5 (1.6) 1.56 (0.10) 4.5 (13.4) 24.4 (7.1) .22 1.62 (0.10) 3.9 (11.7) 86
4 2CH 380 (179) 10.7 (3.1) 7.7 (2.3) 2.14 (0.13) 6.9 (20.7) 28.3 (8.3) .26 1.89 (0.12) 4.6 (13.7) 98
3CH 350 (165) 10.0 (3.0) 7.4 (2.2) 2.00 (0.13) 1.9 (5.5) 31.5 (9.2) .29 2.10 (0.13) 1.8 (5.4) 98
6 2CH 620 (293) 13.6 (4.0) 11.1 (3.3) 2.71 (0.17) 2.9 (8.6) 42.8 (12.5) .39 2.85 (0.18) 2.9 (8.6) 105
3CH 570 (269) 16.4 (4.8) 11.7 (3.4) 3.28 (0.21) 5.2 (15.4) 50.5 (14.8) .46 3.36 (0.21) 4.8 (14.2) 105
Note:
1. CFM = Cubic feet per minute
2. TMBH = Total capacity (MBH)
3. GPM = Gallons per minute
4. WPD = Water pressure drop (feet of water)
5. Q/ITD = MBH (kW)/(Entering water temperature - Entering air temperature) when ∆T and GPM (L/s) remain constant. To determine heating capacities at a different entering water
temperature or entering air temp, compute the new ITD and multiply it by the Q/ITD shown.
6. Medium and low speed capacities are approximately 80 percent and 60 percent respectively of the high speed capacity.