Zehnder Rittling HC, Installation, Operation And Maintenance Manual

Page: 8 / 36

Performance Data
V4H: 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

T = trm - tew (trm = room temperature and tew = entering water
temperature).
n n
All ratings include reduction in capacity for double coil (4-pipe
system).
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
1851
(0.89)
20 432
2436
(1.59)
2505
(0.94)
2375
(0.81)
25 540
3012
(2.48)
3100
(1.47)
3156
(0.97)
2765
(1.26)
3021
(0.74)
30 648
3584
(3.57)
3687
(2.11)
3754
(1.39)
3132
(1.82)
3421
(1.07)
3652
(0.71)
2803
(0.89)
35 756
4270
(2.88)
4348
(1.90)
4326
(1.10)
3479
(2.48)
3800
(1.46)
4057
(0.97)
3083
(1.21)
3403
(0.71)
40 864
4850
(3.76)
4939
(2.48)
4912
(1.44)
3811
(3.24)
4162
(1.91)
4445
(1.26)
4710
(0.73)
3347
(1.58)
3695
(0.94)
2900
(0.92)
45 972
5525
(3.14)
5496
(1.82)
4510
(2.42)
4816
(1.60)
5104
(0.93)
3000
(2.01)
3974
(1.19)
4280
(0.78)
3094
(1.17)
3508
(0.72)
50 1080
6108
(3.88)
6077
(2.25)
4847
(2.99)
5175
(1.97)
5485
(1.14)
3841
(2.48)
4241
(1.46)
4568
(0.96)
4899
(0.56)
3279
(1.45)
3716
(0.89)
2893
(0.95)
55 1188
6654
(2.72)
5172
(3.62)
5523
(2.39)
5854
(1.39)
4074
(3.00)
4497
(1.77)
4894
(1.17)
5195
(0.68)
3455
(1.75)
3916
(1.07)
4231
(0.68)
3038
(1.15)
60 1296
7230
(3.24)
5861
(2.85)
6212
(1.65)
4300
(3.57)
4746
(2.11)
5111
(1.39)
5482
(0.81)
3625
(2.09)
4108
(1.28)
4439
(0.81)
3177
(1.36)
3596
(0.81)
65 1405
7812
(3.80)
6190
(3.34)
6562
(1.94)
4986
(2.48)
5370
(1.63)
5760
(0.95)
3788
(2.84)
4293
(1.50)
4591
(0.95)
3309
(1.60)
3746
(0.95)
70 1512
6511
(3.88)
6901
(2.25)
5219
(2.87)
5621
(1.90)
6030
(1.10)
3945
(2.84)
4471
(1.74)
4831
(1.11)
3438
(1.86)
3899
(1.10)
75 1620
7233
(2.58)
5446
(3.30)
5865
(2.18)
6291
(1.26)
4098
(3.26)
4645
(2.00)
5018
(1.27)
5511
(0.75)
3562
(2.13)
4032
(1.26)
80 1730
7559
(2.94)
5667
(3.76)
6104
(2.48)
6547
(1.44)
4245
(3.71)
4812
(2.27)
5200
(1.27)
5710
(0.86)
3682
(2.43)
4167
(1.44)
85 1838
7878
(3.32)
6336
(2.80)
6796
(1.62)
4975
(2.57)
5375
(1.63)
5903
(0.97)
3797
(2.74)
4300
(1.62)
90 1942
8191
(3.72)
6564
(3.14)
7090
(1.82)
5134
(2.88)
5547
(1.83)
6092
(1.09)
3910
(3.08)
4426
(1.82)
95 2055
6787
(3.50)
7280
(2.03)
5289
(3.21)
5714
(2.04)
6275
(1.21)
4020
(3.43)
4551
(2.03)
100 2160
7005
(3.87)
7513
(2.25)
5440
(3.56)
5878
(2.26)
6454
(1.34)
4127
(3.80)
4672
(2.25)
105 2265
7743
(2.48)
5588
(3.92)
6037
(2.50)
6630
(1.48)
4790
(2.48)
5262
(1.63)
5795
(0.95)
110 2375
7968
(2.72)
6194
(2.74)
6802
(1.63)
4906
(2.72)
5390
(1.79)
5935
(1.04)
115 2482
8190
(2.97)
6397
(2.99)
6970
(1.78)
5018
(2.97)
5514
(1.96)
6072
(1.14)
120 2590
8408
(3.24)
6497
(3.26)
7134
(1.94)
5130
(3.24)
5636
(2.13)
6205
(1.24)
125 2700
8622
(3.51)
6644
(3.54)
7296
(2.10)
5238
(3.51)
5757
(2.32)
6337
(1.34)
130 2810
8834
(3.80)
6790
(3.83)
7455
(2.27)
5344
(3.80)
5871
(2.51)
6465
(1.45)
135 2918
7612
(2.45)
5986
(2.70)
6592
(1.57)
140 3022
7765
(2.64)
6099
(2.91)
6716
(1.69)
145 3130
7917
(2.83)
6210
(3.12)
6837
(1.81)
150 3240
8065
(3.03)
6318
(3.34)
6957
(1.94)
155 3350
8212
(3.23)
6425
(3.56)
7076
(2.07)
160 3460
8357
(3.44)
6531
(3.80)
7191
(2.20)
165 3565
8500
(3.66)
7306
(2.34)
170 3675
8640
(3.89)
7418
(2.49)
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