Zehnder Rittling HC, Installation, Operation And Maintenance Manual

Page: 9 / 36

Performance Data
V4L: Cooling coil capacities (Btuh)
Notes:
n n
Coil capacity for other than 25 °F

T use the following formula:
(trm - tew)/25 x rating at 25 °F  T.
n n
To aide in balancing the water systems, all units regardless of size
have the same pressure drop across the water coils.
n n
The values in the ( ) indicate the nozzle pressure (inches of wg).
n n
The ratings above are based on 25 °F

T, 1.50 gpm water flow rate
and 8 ft water coil pressure drop (all sizes) for a single coil.
n n
All ratings include allowance for lint screens.
n n

T = trm - tew (trm = room temperature and tew = entering water
temperature).
n n
All ratings include reduction in capacity for double coil (4-pipe).
Primary Air Nozzle Arrangement
Cfm
F

T (Btuh)
Capacity
20°
F G H J K
Unit Size
24" 32" 40" 52" 24" 32" 40" 52" 24" 32" 40" 52" 24" 32" 40" 52" 24" 32" 40" 52"
15 324
1517
(0.89)
20 432
1996
(1.59)
2054
(0.94)
1979
(0.81)
25 540
2469
(2.48)
2540
(1.47)
2587
(0.97)
2304
(1.26)
2516
(0.74)
30 648
2938
(3.57)
3022
(2.11)
3079
(1.39)
2609
(1.82)
2850
(1.07)
3043
(0.71)
2375
(0.89)
35 756
3500
(2.88)
3565
(1.90)
3546
(1.10)
2899
(2.48)
3166
(1.46)
3381
(0.97)
2612
(1.21)
2884
(0.71)
40 864
3976
(3.76)
4048
(2.48)
4027
(1.44)
3175
(3.24)
3468
(1.91)
3703
(1.26)
3926
(0.73)
2837
(1.58)
3131
(0.94)
2523
(0.92)
45 972
4529
(3.14)
4506
(2.25)
3758
(2.42)
4013
(1.60)
4254
(0.93)
3050
(2.01)
3368
(1.19)
3627
(0.78)
2691
(1.17)
3050
(0.72)
50 1080
5007
(3.88)
4981
(2.25)
4039
(2.99)
4312
(1.97)
4571
(1.14)
3255
(2.48)
3594
(1.46)
3870
(0.96)
4151
(0.56)
2852
(1.45)
3231
(0.89)
2560
(0.95)
55 1188
5454
(2.72)
4310
(3.62)
4602
(2.39)
4958
(1.39)
3453
(3.00)
3812
(1.77)
4105
(1.17)
4403
(0.68)
3005
(1.75)
3407
(1.07)
3680
(0.68)
2687
(1.15)
60 1296
5926
(3.24)
4883
(2.85)
5176
(1.65)
3643
(3.57)
4022
(2.11)
4335
(1.39)
4646
(0.81)
3152
(2.09)
3573
(1.28)
3861
(0.81)
2809
(1.36)
3181
(0.81)
65 1405
6396
(3.80)
5158
(3.34)
5467
(1.94)
4226
(2.48)
4559
(1.63)
4881
(0.95)
3294
(2.45)
3734
(1.50)
4034
(0.95)
2927
(1.60)
3314
(0.95)
70 1512
5425
(3.88)
5750
(2.25)
4424
(2.87)
4769
(1.90)
5109
(1.10)
3431
(2.84)
3889
(1.74)
4202
(1.11)
3040
(1.86)
3442
(1.10)
3782
(0.72)
75 1620
6028
(2.58)
4615
(3.30)
4971
(2.18)
5332
(1.26)
3564
(3.26)
4039
(2.00)
4364
(1.27)
4793
(0.75)
3151
(2.13)
3566
(1.26)
3918
(0.83)
80 1730
6300
(2.94)
4803
(3.76)
5172
(2.48)
5548
(1.44)
3693
(3.71)
4183
(2.27)
4522
(1.45)
4966
(0.86)
3256
(2..43)
3686
(1.44)
4050
(0.95)
85 1838
6565
(3.32)
5370
(2.80)
5759
(1.62)
4327
(2.57)
4675
(1.63)
5134
(0.97)
3359
(2.74)
3803
(1.62)
4177
(1.07)
90 1942
6826
(3.72)
5563
(3.14)
5966
(1.82)
4465
(2.88)
4824
(1.83)
5298
(1.09)
3459
(3.08)
3915
(1.82)
4301
(1.20)
4736
(0.69)
95 2055
5751
(3.50)
6169
(2.03)
4600
(3.21)
4970
(2.04)
5458
(1.21)
3556
(3.43)
4025
(2.03)
4423
(1.34)
4870
(0.77)
100 2160
5936
(3.87)
6367
(2.25)
4731
(3.56)
5112
(2.26)
5614
(1.34)
3651
(3.80)
4133
(2.25)
4540
(1.48)
5000
(0.86)
105 2265
6561
(2.48)
4860
(3.92)
5251
(2.50)
5766
(1.48)
4237
(2.48)
4655
(1.63)
5126
(0.95)
110 2375
6753
(2.72)
5387
(2.74)
5916
(1.63)
4340
(2.72)
4768
(1.79)
5250
(1.04)
115 2482
6940
(2.97)
5520
(2.99)
6061
(1.78)
4440
(2.97)
4877
(1.96)
5370
(1.14)
120 2590
7126
(3.24)
5651
(3.26)
6205
(1.94)
4537
(3.24)
4985
(2.13)
5489
(1.24)
125 2700
7307
(3.51)
5780
(3.54)
6346
(2.10)
4633
(3.51)
5090
(2.32)
5605
(1.34)
130 2810
7485
(3.80)
5905
(3.83)
6485
(2.27)
4727
(3.80)
5194
(2.51)
5719
(1.45)
135 2918
6620
(2.45)
5295
(2.70)
5830
(1.57)
140 3022
6754
(2.64)
5395
(2.91)
5940
(1.69)
145 3130
6885
(2.83)
5493
(3.12)
6048
(1.81)
150 3240
7075
(3.03)
5589
(3.34)
6154
(1.94)
155 3350
7142
(3.23)
5683
(3.56)
6259
(2.07)
160 3460
7268
(3.44)
5777
(3.80)
6361
(2.20)
165 3565
7392
(3.66)
6462
(2.34)
170 3675
7515
(3.89)
6560
(2.49)
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