Zehnder Rittling HC Installation and operating instructions

i
Cooling Fresh Air Clean AirHeating
Induction Unit
Installation, Operation and Maintenance

Models and arrangements 1
Performance data 3
Dimensions and data 12
General information 21
Receiving 21
Safety considerations 22
Unpacking and preparation 23
Handling and installation 24
Chilled/hot water connections 25
Ductwork connections 26
Start-up 26
Air system balancing 27
Cooling/heating system 27
Water system balancing 28
Water treatment 28
Normal operation/maintenance 29
Replacement parts 30
Troubleshooting 30
Equipment start-up checklist 31
IMPORTANT: Submittal documentation, specific to
each project, supersedes the general guidelines
contained within this manual.

Water control
models
Nine models are available in low
profile wall hung, wall hung and
ceiling mounted types. Each
model has 4 lengths and 5 nozzle
arrangements to meet the desired air
flow.
The vertical units are best suited for
under the window applications to
counteract downdrafts during the
heating season. Horizontal units are
the best choice where the use of full
length draperies is desirable and
heating requirements are not too
severe.
Ceiling models
Wall models
Model H4C: Horizontal ceiling
4-pipe system
Model V4L: Vertical wall low
profile 4-pipe system
Model HC: Horizontal ceiling
2-pipe system
Model VL: Vertical wall with low
profile 2-pipe system
1Models and arrangements

Wall models
Model V2H: Vertical wall with
heat recovery stack high
capacity coil 2-pipe system
Model VW: Vertical wall 2-pipe
system
Model VH: Vertical wall with
heat recovery stack 2-pipe
system
Model V4H: Vertical wall with
heat recovery stack 4-pipe
system
Model V4W: Vertical wall 4-pipe
system
2

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 1383
(0.89)
20 432 1820
(1.59)
1872
(0.94)
1888
(0.81)
25 540 2251
(2.48)
2316
(1.47)
2358
(0.97)
2199
(1.26)
2402
(0.74)
30 648 2678
(3.57)
2756
(2.11)
2806
(1.39)
2490
(1.82)
2720
(1.07)
2904
(0.71)
2375
(0.89)
35 756 3192
(2.88)
3250
(1.90)
3233
(1.10)
2766
(2.48)
3022
(1.46)
3227
(0.97)
2612
(1.21)
2884
(0.71)
40 864 3625
(3.76)
3691
(2.48)
3672
(1.44)
3030
(3.24)
3310
(1.91)
3534
(1.26)
3746
(0.73)
2837
(1.58)
3131
(0.94)
2646
(0.92)
45 972 4129
(3.14)
4108
(1.82)
3587
(2.42)
3830
(1.60)
4060
(0.93)
3050
(2.01)
3367
(1.19)
3627
(0.78)
2823
(1.17)
3200
(0.72)
50 1080 4565
(3.88)
4542
(2.25)
3854
(2.99)
4116
(1.97)
4362
(1.14)
3255
(2.48)
3594
(1.46)
3870
(0.96)
4151
(0.56)
2991
(1.45)
3391
(0.89)
2852
(0.95)
55 1188 4974
(2.72)
4113
(3.62)
4392
(2.39)
4655
(1.39)
3453
(3.57)
3811
(1.77)
4105
(1.17)
4403
(0.68)
3152
(1.75)
3573
(1.07)
3860
(0.68)
2995
(1.15)
60 1296 5403
(3.24)
4661
(2.85)
4940
(1.65)
3643
(3.57)
4022
(2.11)
4331
(1.39)
4645
(0.81)
3307
(2.09)
3748
(1.28)
4049
(0.81)
3131
(1.36)
3545
(0.81)
65 1405 5832
(3.80)
4923
(3.34)
5217
(1.94)
4225
(2.48)
4550
(1.63)
4881
(0.95)
3455
(2.45)
3917
(1.50)
4231
(0.95)
3263
(1.60)
3693
(0.95)
70 1512 5178
(3.88)
5488
(2.25)
4423
(2.87)
4763
(1.90)
5109
(1.10)
3599
(2.84)
4079
(1.74)
4407
(1.11)
3389
(1.86)
3836
(1.10)
4215
(0.72)
75 1620 5753
(2.58)
4615
(3.30)
4971
(2.18)
5331
(1.26)
3738
(3.26)
4237
(2.00)
4578
(1.27)
5027
(0.75)
3511
(2.13)
3974
(1.26)
4366
(0.83)
80 1730 6012
(2.94)
4803
(3.76)
5173
(2.48)
5548
(1.44)
3873
(3.71)
4390
(2.27)
4743
(1.45)
5209
(0.86)
3629
(2.43)
4108
(1.44)
4513
(0.95)
85 1838 6265
(3.32)
5370
(2.80)
5759
(1.62)
4539
(2.57)
4904
(1.63)
5385
(0.87)
3743
(2.74)
4238
(1.62)
4656
(1.07)
90 1942 6515
(3.72)
5563
(3.14)
5966
(1.82)
4684
(2.88)
5060
(1.83)
5557
(1.09)
3855
(3.08)
4364
(1.82)
4794
(1.20)
5279
(0.69)
95 2055 5751
(3.50)
6168
(2.03)
4825
(3.21)
5213
(2.04)
5725
(1.21)
3963
(3.43)
4486
(2.03)
4929
(1.34)
5427
(0.77)
100 2160 5936
(3.87)
6367
(2.25)
4963
(3.56)
5362
(2.26)
5888
(1.34)
4069
(3.80)
4606
(2.25)
5060
(1.48)
5572
(0.86)
105 2265 6561
(2.48)
5098
(3.92)
5508
(2.50)
6048
(1.48)
4722
(2.48)
5188
(1.63)
5713
(0.95)
110 2375 6752
(2.72)
5650
(2.74)
6205
(1.63)
4836
(2.72)
5313
(1.79)
5851
(1.04)
115 2482 6940
(2.97)
5790
(2.99)
6359
(1.78)
4948
(2.97)
5436
(1.96)
5986
(1.14)
120 2590 7125
(3.24)
5927
(3.26)
6509
(1.94)
5057
(3.24)
5556
(2.13)
6118
(1.24)
125 2700 7307
(3.51)
6061
(3.54)
6657
(2.10)
5164
(3.51)
5673
(2.32)
6247
(1.34)
130 2810 7486
(3.80)
6194
(3.83)
6802
(2.27)
5269
(3.80)
5788
(2.51)
6374
(1.45)
135 2918 6944
(2.45)
5901
(2.70)
6498
(1.57)
140 3022 7084
(2.64)
6012
(2.91)
6620
(1.69)
145 3130 7222
(2.83)
6121
(3.12)
6741
(1.81)
150 3240 7358
(3.03)
6229
(3.34)
6859
(1.94)
155 3350 7492
(3.23)
6334
(3.56)
6975
(2.07)
160 3460 7624
(3.44)
6438
(3.80)
7089
(2.20)
165 3565 7754
(3.66)
7202
(2.34)
170 3675 7882
(3.89)
7313
(2.49)
Performance Data
H4C: Cooling coil capacities (Btuh)
Notes:
 Coil capacity for other than 25 °F T use the following formula:
(trm - tew)/25 x rating at 25 °F T.
 To aide in balancing the water systems, all units regardless of size
have the same pressure drop across the water coils.
 The values in the ( ) indicate the nozzle pressure (inches of wg).
 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.
 All ratings include allowance for lint screens.
 T = trm - tew (trm = room temperature and tew = entering water
temperature).
 All ratings include reduction in capacity for double coil (4-pipe).
3Ratings

Performance Data
HC: Cooling coil capacities (Btuh)
Notes:
 Coil capacity for other than 25 °F T use the following formula:
(trm - tew)/25 x rating at 25 °F T.
 To aide in balancing the water systems, all units regardless of size
have the same pressure drop across the water coils.
 The values in the ( ) indicate the nozzle pressure (inches of wg).
 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.
 All ratings include allowance for lint screens.
 T = trm - tew (trm = room temperature and tew = entering water
temperature).
 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 1537
(0.89)
20 432 2022
(1.59)
2080
(0.94)
2098
(0.81)
25 540 2501
(2.48)
2573
(1.47)
2620
(0.97)
2443
(1.26)
2669
(0.74)
30 648 2976
(3.57)
3062
(2.11)
3118
(1.39)
2767
(1.82)
3022
(1.07)
3227
(0.71)
2639
(0.89)
35 756 3546
(2.88)
3611
(1.90)
3592
(1.10)
3074
(2.48)
3357
(1.46)
3585
(0.97)
2902
(1.21)
3204
(0.71)
40 864 4028
(3.76)
4101
(2.48)
4080
(1.44)
3367
(3.24)
3678
(1.91)
3927
(1.26)
4163
(0.73)
3152
(1.58)
3479
(0.94)
2940
(0.92)
45 972 4588
(3.14)
4564
(1.82)
3986
(2.42)
4256
(1.60)
4511
(0.93)
3389
(2.01)
3742
(1.19)
4030
(0.78)
3137
(1.17)
3555
(0.72)
50 1080 5073
(3.88)
5046
(2.25)
4283
(2.99)
4573
(1.97)
4847
(1.14)
3617
(2.48)
3993
(1.46)
4300
(0.96)
4612
(0.56)
3324
(1.45)
3767
(0.89)
3169
(0.95)
55 1188 5526
(2.72)
4570
(3.62)
4880
(2.39)
5173
(1.39)
3836
(3.00)
4235
(1.77)
4561
(1.17)
4892
(0.68)
3503
(1.75)
3970
(1.07)
4289
(0.68)
3328
(1.15)
60 1296 6004
(3.24)
5179
(2.85)
5489
(1.65)
4048
(3.57)
4469
(2.11)
4812
(1.39)
5162
(0.81)
3674
(2.09)
4164
(1.28)
4499
(0.81)
3479
(1.36)
3939
(0.81)
65 1405 5470
(3.34)
5797
(1.94)
4695
(2.48)
5056
(1.63)
5423
(0.95)
3839
(2.45)
4352
(1.50)
4702
(0.95)
3625
(1.60)
4104
(0.95)
70 1512 6098
(2.25)
4915
(2.87)
5293
(1.90)
5677
(1.10)
3999
(2.84)
4533
(1.74)
4897
(1.11)
3765
(1.86)
4263
(1.10)
4683
(0.72)
75 1620 6392
(2.58)
5128
(3.30)
5523
(2.18)
5924
(1.26)
4154
(3.26)
4708
(2.00)
5086
(1.27)
5586
(0.75)
3901
(2.13)
4416
(1.26)
4852
(0.83)
80 1730 6680
(2.94)
5337
(3.76)
5747
(2.48)
6164
(1.44)
4304
(3.71)
4878
(2.27)
5270
(1.45)
5788
(0.86)
4032
(2.43)
4564
(1.44)
5015
(0.95)
85 1838 6962
(3.32)
5966
(2.80)
6399
(1.62)
5043
(2.57)
5449
(1.63)
5984
(0.97)
4159
(2.74)
4709
(1.62)
5173
(1.07)
90 1942 6181
(3.14)
6629
(1.82)
5204
(2.88)
5622
(1.83)
6175
(1.09)
4283
(3.08)
4849
(1.82)
5327
(1.20)
5866
(0.69)
95 2055 6390
(3.50)
6854
(2.03)
5361
(3.21)
5792
(2.04)
6361
(1.21)
4403
(3.43)
4985
(2.03)
5476
(1.34)
6030
(0.77)
100 2160 7074
(2.25)
5514
(3.56)
5958
(2.26)
6543
(1.34)
4521
(3.80)
5118
(2.25)
5622
(1.48)
6191
(0.86)
105 2265 7290
(2.48)
5664
(3.92)
6120
(2.50)
6721
(1.48)
5247
(2.48)
5765
(1.63)
6348
(0.95)
110 2375 7503
(2.72)
6278
(2.74)
6895
(1.63)
5374
(2.72)
5904
(1.79)
6501
(1.04)
115 2482 7711
(2.97)
6433
(2.99)
7065
(1.78)
5498
(2.97)
6040
(1.96)
6651|
(1.14)
120 2590 7917
(3.24)
6586
(3.26)
7232
(1.94)
5619
(3.24)
6173
(2.13)
6797
(1.24)
125 2700 8119
(3.51)
6735
(3.54)
7396
(2.10)
5738 )
(3.51)
6303
(2.32)
6941
(1.34)
130 2810 7558
(2.27)
5854
(3.80)
6431
(2.51)
7082
(1.45)
135 2918 7716
(2.45)
6557
(2.70)
7220
(1.57)
140 3022 7872
(2.64)
6680
(2.91)
7356
(1.69)
145 3130 8025
(2.83)
6802
(3.12)
7490
(1.81)
150 3240 8176
(3.03)
6921
(3.34)
7621
(1.94)
155 3350 8325
(3.23)
7038
(3.56)
7750
(2.07)
160 3460 8471
(3.44)
7154
(3.80)
7877
(2.20)
165 3565 8002
(2.34)
170 3675 8126
(2.49)
4

Performance Data
V2H: Cooling coil capacities (Btuh)
Notes:
 Coil capacity for other than 25 °F T use the following formula:
(trm - tew)/25 x rating at 25 °F T.
 To aide in balancing the water systems, all units regardless of size
have the same pressure drop across the water coils.
 The values in the ( ) indicate the nozzle pressure (inches of wg).
 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.
 All ratings include allowance for lint screens.
 T = trm - tew (trm = room temperature and tew = entering water
temperature).
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 2131
(0.89)
20 432 2803
(1.59)
2884
(0.94)
2839
(0.81)
25 540 3467
(2.48)
3567
(1.47)
3632
(0.97)
3306
(1.26)
3611
(0.74)
30 648 4125
(3.57)
4244
(2.11)
4321
(1.39)
3744
(1.82)
4089
(1.07)
4367
(0.71)
3484
(0.89)
35 756 4915
(2.88)
5005
(1.90)
4979
(1.10)
4159
(2.48)
4543
(1.46)
4851
(0.97)
3831
(1.21)
4230
(0.71)
40 864 5582
(3.76)
5684
(2.48)
5655
(1.44)
4556
(3.24)
4976
(1.91)
5314
(1.26)
5632
(0.73)
4160
(1.58)
4593
(0.94)
3784
(0.92)
45 972 6359
(3.14)
6326
(1.82)
5393
(2.42)
5758
(1.60)
6103
(0.93)
4474
(2.01)
4939
(1.19)
5319
(0.78)
4037
(1.17)
4576
(0.72)
50 1080 7031
(3.88)
6995
(2.25)
5795
(2.99)
6188
(1.97)
6558
(1.14)
4775
(2.48)
5271
(1.46)
5677
(0.96)
6088
(0.56)
4278
(1.45)
4849
(0.89)
3974
(0.95)
55 1188 7660
(2.72)
6184
(3.62)
6603
(2.39)
6999
(1.39)
5064
(3.00)
5590
(1.77)
6021
(1.17)
6457
(0.68)
4508
(1.75)
5109
(1.07)
5520
(0.68)
4173
(1.15)
60 1296 8332
(3.24)
7007
(2.85)
7427
(1.65)
5343
(3.57)
5899
(2.11)
6353
(1.39)
6813
(0.81)
4729
(2.09)
5360
(1.28)
5791
(0.81)
4363
(1.36)
4939
(0.81)
65 1405 8981
(3.80)
7400
(3.34)
7844
(1.94)
6197
(2.48)
6674
(1.63)
7158
(0.95)
4941
(2.45)
5601
(1.50)
6051
(0.95)
4546
(1.60)
5146
(0.95)
70 1512 7784
(3.88)
8251
(2.25)
6487
(2.87)
6987
(1.90)
7493
(1.10)
5147
(2.84)
5834
(1.74)
6303
(1.11)
4722
(1.86)
5345
(1.10)
5873
(0.72)
75 1620 8648
(2.58)
6769
(3.30)
7290
(2.18)
7819
(1.26)
5346
(3.26)
6059
(2.00)
6546
(1.27)
7189
(0.75)
4892
(2.13)
5538
(1.26)
6084
(0.83)
80 1730 9038
(2.94)
7045
(3.76)
7587
(2.48)
8137
(1.44)
5539
(3.71)
6278
(2.27)
6783
(1.45)
7449
(0.86)
5056
(2.43)
5724
(1.44)
6289
(0.95)
85 1838 9419
(3.32)
7876
(2.80)
8447
(1.62)
6491
(2.57)
7012
(1.63)
7701
(0.97)
5216
(2.74)
5905
(1.62)
6487
(1.07)
90 1942 9794
(3.71)
8159
(3.14)
8750
(1.82)
6698
(2.88)
7236
(1.83)
7947
(1.09)
5371
(3.08)
6080
(1.82)
6680
(1.20)
7356
(0.69)
95 2055 8435
(3.50)
9047
(2.03)
6900
(3.21)
7455
(2.04)
8187
(1.21)
5522
(3.43)
6251
(2.03)
6868
(1.34)
7562
(0.77)
100 2160 8707
(3.87)
9338
(2.25)
7097
(3.56)
7668
(2.26)
8421
(1.34)
5669
(3.80)
6417
(2.25)
7050
(1.48)
7764
(0.86)
105 2265 9624
(2.48)
7290
(3.92)
7876
(2.50)
8649
(1.48)
6580
(2.48)
7229
(1.63)
7960
(0.95)
110 2375 9904
(2.72)
8080
(2.74)
8873
(1.63)
6739
(2.72)
7403
(1.79)
8152
(1.04)
115 2482 10179
(2.97)
8280
(2.99)
9093
(1.78)
6874
(2.97)
7574
(1.96)
8340
(1.14)
120 2590 10450
(3.24)
8476
(3.26)
9308
(1.94)
7046
(3.24)
7741
(2.13)
8524
(1.24)
125 2700 10717
(3.51)
8668
(3.54)
9519
(2.10)
7195
(3.51)
7905
(2.32)
8704
(1.34)
130 2810 10979
(3.80)
8857
(3.83)
9727
(2.27)
7341
(3.80)
8065
(2.51)
8881
(1.45)
135 2918 9931
(2.45)
8223
(2.70)
9054
(1.57)
140 3022 10131
(2.64)
8377
(2.91)
9225
(1.69)
145 3130 10328
(2.83)
8529
(3.12)
9392
(1.81)
150 3240 10523
(3.03)
8679
(3.34)
9557
(1.94)
155 3350 10714
(3.23)
8826
(3.56)
9719
(2.07)
160 3460 10902
(3.44)
8971
(3.80)
9878
(2.20)
165 3565 11088
(3.89)
10035
(2.34)
170 3675 11272
(3.89)
10190
(2.49)
5

Performance Data
V4H: Cooling coil capacities (Btuh)
Notes:
 Coil capacity for other than 25 °F T use the following formula:
(trm - tew)/25 x rating at 25 °F T.
 To aide in balancing the water systems, all units regardless of size
have the same pressure drop across the water coils.
 The values in the ( ) indicate the nozzle pressure (inches of wg).
 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.
 T = trm - tew (trm = room temperature and tew = entering water
temperature).
 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)
6

Performance Data
V4L: Cooling coil capacities (Btuh)
Notes:
 Coil capacity for other than 25 °F T use the following formula:
(trm - tew)/25 x rating at 25 °F T.
 To aide in balancing the water systems, all units regardless of size
have the same pressure drop across the water coils.
 The values in the ( ) indicate the nozzle pressure (inches of wg).
 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.
 All ratings include allowance for lint screens.
 T = trm - tew (trm = room temperature and tew = entering water
temperature).
 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)
7

Performance Data
V4W: Cooling coil capacities (Btuh)
Notes:
 Coil capacity for other than 25 °F T use the following formula:
(trm - tew)/25 x rating at 25 °F T.
 To aide in balancing the water systems, all units regardless of size
have the same pressure drop across the water coils.
 The values in the ( ) indicate the nozzle pressure (inches of wg).
 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.
 All ratings include allowance for lint screens.
 T = trm - tew (trm = room temperature and tew = entering water
temperature).
 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 1383
(0.89)
20 432 1820
(1.59)
1872
(0.94)
1888
(0.81)
25 540 2251
(2.48)
2316
(1.47)
2358
(0.97)
2199
(1.26)
2402
(0.74)
30 648 2678
(3.57)
2756
(2.11)
2806
(1.39)
2490
(1.82)
2720
(1.07)
2904
(0.71)
2375
(0.89)
35 756 3192
(2.88)
3250
(1.90)
3233
(1.10)
2766
(2.48)
3022
(1.46)
3227
(0.97)
2612
(1.21)
2884
(0.71)
40 864 3625
(3.76)
3691
(2.48)
3672
(1.44)
3030
(3.24)
3310
(1.91)
3534
(1.26)
3746
(0.73)
2837
(1.58)
3131
(0.94)
2646
(0.92)
45 972 4129
(3.14)
4108
(1.82)
3587
(2.42)
3830
(1.60)
4060
(0.93)
3050
(2.01)
3367
(1.19)
3627
(0.78)
2823
(1.17)
3200
(0.72)
50 1080 4565
(3.88)
4542
(2.25)
3854
(2.99)
4116
(1.97)
4362
(1.14)
3255
(2.48)
3594
(1.46)
3870
(0.96)
4151
(0.56)
2991
(1.45)
3391
(0.89)
2852
(0.95)
55 1188 4974
(2.72)
4113
(3.62)
4392
(2.39)
4655
(1.39)
3453
(3.00)
3811
(1.77)
4105
(1.17)
4403
(0.68)
3152
(1.75)
3573
(1.07)
3860
(0.68)
2995
(1.15)
60 1296 5403
(3.24)
4661
(2.85)
4940
(1.65)
3643
(3.57)
4022
(2.11)
4331
(1.39)
4645
(0.81)
3307
(2.09)
3748
(1.28)
4049
(0.81)
3131
(1.36)
3545
(0.81)
65 1405 5832
(3.80)
4923
(3.34)
5217
(1.94)
4225
(2.48)
4550
(1.63)
4881
(0.95)
3455
(2.45)
3917
(1.50)
4231
(0.95)
3263
(1.60)
3693
(0.95)
70 1512 5178
(3.88)
5488
(2.25)
4423
(2.87)
4763
(1.90)
5109
(1.10)
3599
(2.84)
4079
(1.74)
4407
(1.11)
3389
(1.86)
3836
(1.10)
4215
(0.72)
75 1620 5753
(2.58)
4615
(3.30)
4971
(2.18)
5331
(1.26)
3738
(3.26)
4237
(2.00)
4578
(1.27)
5027
(0.75)
3511
(2.13)
3974
(1.26)
4366
(0.83)
80 1730 6012
(2.94)
4803
(3.76)
5173
(2.48)
5548
(1.44)
3873
(3.71)
4390
(2.27)
4743
(1.45)
5209
(0.86)
3629
(2.43)
4108
(1.44)
4513
(0.95)
85 1838 6265
(3.32)
5370
(2.80)
5759
(1.62)
4539
(2.57)
4904
(1.63)
5385
(0.97)
3743
(2.74)
4238
(1.62)
4656
(1.07)
90 1942 6515
(3.72)
5563
(3.14)
5966
(1.82)
4684
(2.88)
5060
(1.83)
5557
(1.09)
3855
(3.08)
4364
(1.82)
4794
(1.20)
5279
(0.69)
95 2055 5751
(3.50)
6168
(2.03)
4825
(3.21)
5213
(2.04)
5725
(1.21)
3963
(3.43)
4486
(2.03)
4929
(1.34)
5427
(0.77)
100 2160 5936
(3.87)
6367
(2.25)
4963
(3.56)
5362
(2.26)
5888
(1.34)
4069
(3.80)
4606
(2.25)
5060
(1.48)
5572
(0.86)
105 2265 6561
(2.48)
5098
(3.92)
5508
(2.50)
6048
(1.48)
4722
(2.48)
5188
(1.63)
5713
(0.95)
110 2375 6752
(2.72)
5650
(2.74)
6205
(1.63)
4836
(2.72)
5313
(1.79)
5851
(1.04)
115 2482 6940
(2.97)
5790
(2.99)
6359
(1.78)
4948
(2.97)
5436
(1.96)
5986
(1.14)
120 2590 7125
(3.24)
5927
(3.26)
6509
(1.94)
5057
(3.24)
5556
(2.13)
6118
(1.24)
125 2700 7307
(3.51)
6061
(3.54)
6657
(2.10)
5164
(3.51)
5673
(2.32)
6247
(1.34)
130 2810 7486
(3.80)
6194
(3.83)
6802
(2.27)
5269
(3.80)
5788
(2.51)
6374
(1.45)
135 2918 6944
(2.45)
5901
(2.70)
6498
(1.57)
140 3022 7084
(2.64)
6012
(2.91)
6620
(1.69)
145 3130 7222
(2.83)
6121
(3.12)
6741
(1.81)
150 3240 7358
(3.03)
6229
(3.34)
6859
(1.94)
155 3350 7492
(3.23)
6334
(3.56)
6975
(2.07)
160 3460 7624
(3.44)
6438
(3.80)
7089
(2.20)
165 3565 7754
(3.66)
7202
(2.34)
170 3675 7882
(3.89)
7313
(2.49)
8

Performance Data
VH: Cooling coil capacities (Btuh)
Notes:
 Coil capacity for other than 25 °F T use the following formula:
(trm - tew)/25 x rating at 25 °F T.
 To aide in balancing the water systems, all units regardless of size
have the same pressure drop across the water coils.
 The values in the ( ) indicate the nozzle pressure (inches of wg).
 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.
 All ratings include allowance for lint screens.
 T = trm - tew (trm = room temperature and tew = entering water
temperature).
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 1969
(0.89)
20 432 2591
(1.59)
2665
(0.94)
2581
(0.81)
25 540 3204
(2.48)
3297
(1.47)
3357
(0.97)
3005
(1.26)
3283
(0.74)
30 648 3812
(3.57)
3922
(2.11)
3994
(1.39)
3404
(1.82)
3718
(1.07)
3970
(0.71)
3114
(0.89)
35 756 4543
(2.88)
4626
(1.90)
4602
(1.10)
3781
(2.48)
4130
(1.46)
4410
(0.97)
3425
(1.21)
3781
(0.71)
40 864 5159
(3.76)
5254
(2.48)
5226
(1.44)
4142
(3.24)
4524
(1.91)
4831
(1.26)
5120
(0.73)
3719
(1.58)
4106
(0.94)
3296
(0.92)
45 972 5878
(3.14)
5847
(1.82)
4902
(2.42)
5235
(1.60)
5548
(0.93)
4000
(2.01)
4415
(1.19)
4755
(0.78)
3516
(1.17)
3986
(0.72)
50 1080 6498
(3.88)
6465
(2.25)
5268
(2.99)
5625
(1.97)
5962
(1.14)
4268
(2.48)
4712
(1.46)
5075
(0.96)
5443
(0.56)
3726
(1.45)
4223
(0.89)
3404
(0.95)
55 1188 7079
(2.72)
5622
(3.62)
6003
(2.39)
6363
(1.39)
4527
(3.00)
4997
(1.77)
5382
(1.17)
5772
(0.68)
3926
(1.75)
4450
(1.07)
4808
(0.68)
3574
(1.15)
60 1296 7691
(3.24)
6370
(2.85)
6752
(1.65)
4777
(3.57)
5273
(2.11)
5679
(1.39)
6091
(0.81)
4119
(2.09)
4668
(1.28)
5044
(0.81)
3737
(1.36)
4230
(0.81)
65 1405 8301
(3.80)
6728
(3.34)
7131
(1.94)
5540
(2.48)
5966
(1.63)
6399
(0.95)
4304
(2.45)
4878
(1.50)
5271
(0.95)
3893
(1.60)
4407
(0.95)
70 1512 7077
(3.88)
7501
(2.25)
5799
(2.87)
6246
(1.90)
6699
(1.10)
4483
(2.84)
5081
(1.74)
5490
(1.11)
4044
(1.86)
4578
(1.10)
75 1620 7862
(2.58)
6051
(3.30)
6517
(2.18)
6990
(1.26)
4656
(3.26)
5278
(2.00)
5702
(1.27)
6262
(0.75)
4190
(2.13)
4743
(1.26)
80 1730 8216
(2.94)
6297
(3.76)
6782
(2.48)
7274
(1.44)
4824
(3.71)
5468
(2.27)
5908
(1.45)
6488
(0.86)
4331
(2.43)
4902
(1.44)
85 1838 8563
(3.32)
7040
(2.80)
7551
(1.62)
5653
(2.57)
6108
(1.63)
6708
(0.97)
4467
(2.74)
5057
(1.62)
90 1942 8903
(3.72)
7293
(3.14)
7822
(1.82)
5834
(2.88)
6303
(1.83)
6922
(1.09)
4600
(3.08)
5207
(1.82)
95 2055 7541
(3.50)
8088
(2.03)
6010
(3.21)
6493
(2.04)
7131
(1.21)
4729
(3.43)
5354
(2.03)
100 2160 7783
(3.87)
8348
(2.25)
6182
(3.56)
6679
(2.26)
7334
(1.34)
4855
(3.80)
5496
(2.25)
105 2265 8603
(2.48)
6350
(3.92)
6860
(2.50)
7534
(1.48)
5635
(2.48)
6191
(1.63)
6818
(0.95)
110 2375 8853
(2.72)
7038
(2.74)
7729
(1.63)
5771
(2.72)
6341
(1.79)
6982
(1.04)
115 2482 9100
(2.97)
7212
(2.99)
7920
(1.78)
5904
(2.97)
6487
(1.96)
7143
(1.14)
120 2590 9342
(3.24)
7383
(3.26)
8107
(1.94)
6035
(3.24)
6630
(2.13)
7300
(1.24)
125 2700 9580
(3.51)
7550
(3.54)
8291
(2.10)
6162
(3.51)
6770
(2.32)
7455
(1.34)
130 2810 9815
(3.80)
7715
(3.83)
8472
(2.27)
6287
(3.80)
6907
(2.51)
7606
(1.45)
135 2918 8650
(2.45)
7042
(2.70)
7755
(1.57)
140 3022 8824
(2.64)
7175
(2.91)
7901
(1.69)
145 3130 8996
(2.83)
7305
(3.12)
8044
(1.81)
150 3240 9165
(3.03)
7433
(3.34)
8185
(1.94)
155 3350 9332
(3.23)
7559
(3.56)
8324
(2.07)
160 3460 9496
(3.44)
7683
(3.80)
8460
(2.20)
165 3565 9658
(3.66)
8595
(2.34)
170 3675 9818
(3.89)
8727
(2.49)
9

Performance Data
VL: Cooling coil capacities (Btuh)
Notes:
 Coil capacity for other than 25 °F T use the following formula:
(trm - tew)/25 x rating at 25 °F T.
 To aide in balancing the water systems, all units regardless of size
have the same pressure drop across the water coils.
 The values in the ( ) indicate the nozzle pressure (inches of wg).
 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.
 All ratings include allowance for lint screens.
 T = trm - tew (trm = room temperature and tew = entering water
temperature).
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 1614
(0.89)
20 432 2123
(1.59)
2185
(0.94)
2151
(0.81)
25 540 2626
(2.48)
2702
(1.47)
2752
(0.97)
2504
(1.26)
2735
(0.74)
30 648 3125
(3.57)
3215
(2.11)
3274
(1.39)
2836
(1.82)
3098
(1.07)
3308
(0.71)
2639
(0.89)
35 756 3724
(2.88)
3792
(1.90)
3772
(1.10)
3151
(2.48)
3441
(1.46)
3675
(0.97)
2902
(1.21)
3204
(0.71)
40 864 4229
(3.76)
4306
(2.48)
4284
(1.44)
3451
(3.24)
3770
(1.91)
4025
(1.26)
4267
(0.73)
3152
(1.58)
3479
(0.94)
2867
(0.92)
45 972 4818
(3.14)
4793
(1.82)
4085
(2.42)
4362
(1.60)
4624
(0.93)
3389
(2.01)
3742
(1.19)
4030
(0.78)
3058
(1.17)
3466
(0.72)
50 1080 5326
(3.88)
5299
(2.25)
4390
(2.99)
4687
(1.97)
4968
(1.14)
3617
(2.48)
3993
(1.46)
4300
(0.96)
4612
(0.56)
3241
(1.45)
3673
(0.89)
3011
(0.95)
55 1188 5803
(2.72)
4685
(3.62)
5002
(2.39)
5302
(1.39)
3836
(3.00)
4235
(1.77)
4561
(1.17)
4892
(0.68)
3415
(1.75)
3871
(1.07)
4182
(0.68)
3161
(1.15)
60 1296 6304
(3.24)
5308
(2.85)
5626
(1.65)
4048
(3.57)
4469
(2.11)
4812
(1.39)
5162
(0.81)
3582
(2.09)
4060
(1.28)
4387
(0.81)
3305
(1.36)
3742
(0.81)
65 1405 6804
(3.80)
5606
(3.34)
5942
(1.94)
4695
(2.48)
5056
(1.63)
5423
(0.95)
3743
(2.45)
4243
(1.50)
4584
(0.95)
3444
(1.60)
3898
(0.95)
70 1512 5897
(3.88)
6250
(2.25)
4915
(2.87)
5293
(1.90)
5677
(1.10)
3899
(2.84)
4419
(1.74)
4775
(1.11)
3577
(1.86)
4049
(1.10)
4449
(0.72)
75 1620 6552
(2.58)
5128
(3.30)
5523
(2.18)
5924
(1.26)
4050
(3.26)
4590
(2.00)
4959
(1.27)
5446
(0.75)
3706
(2.13)
4195
(1.26)
4609
(0.83)
80 1730 6847
(2.94)
5337
(3.76)
5747
(2.48)
6164
(1.44)
4196
(3.71)
4756
(2.27)
5138
(1.45)
5643
(0.86)
3830
(2.43)
4336
(1.44)
4764
(0.95)
85 1838 7136
(3.32)
5966
(2.80)
6399
(1.62)
4917
(2.57)
5312
(1.63)
5834
(0.97)
3951
(2.74)
4473
(1.62)
4914
(1.07)
90 1942 7419
(3.72)
6181
(3.14)
6629
(1.82)
5074
(2.88)
5482
(1.83)
6020
(1.09)
4069
(3.08)
4606
(1.82)
5060
(1.20)
5572
(0.69)
95 2055 6390
(3.50)
6854
(2.03)
5227
(3.21)
5647
(2.04)
6202
(1.21)
4183
(3.43)
4735
(2.03)
5203
(1.34)
5729
(0.77)
100 2160 6596
(3.87)
7074
(2.25)
5376
(3.56)
5809
(2.26)
6379
(1.34)
4295
(3.80)
4862
(2.25)
5341
(1.48)
5881
(0.86)
105 2265 7290
(2.48)
5523
(3.92)
5967
(2.50)
6552
(1.48)
4985
(2.48)
5476
(1.63)
6030
(0.95)
110 2375 7503
(2.72)
6121
(2.74)
6722
(1.63)
5105
(2.72)
5609
(1.79)
6176
(1.04)
115 2482 7711
(2.97)
6272
(2.99)
6888
(1.78)
5223
(2.97)
5738
(1.96)
6318
(1.14)
120 2590 7917
(3.24)
6421
(3.26)
7051
(1.94)
5338
(3.24)
5864
(2.13)
6457
(1.24)
125 2700 8119
(3.51)
6567
(3.54)
7211
(2.10)
5451
(3.51)
5988
(2.32)
6594
(1.34)
130 2810 8317
(3.80)
6710
(3.83)
7369
(2.27)
5561
(3.80)
6110
(2.51)
6728
(1.45)
135 2918 7523
(2.45)
6229
(2.70)
6859
(1.57)
140 3022 7675
(2.64)
6346
(2.91)
6988
(1.69)
145 3130 7824
(2.83)
6462
(3.12)
7115
(1.81)
150 3240 7972
(3.03)
6575
(3.34)
7240
(1.94)
155 3350 8116
(3.23)
6686
(3.56)
7363
(2.07)
160 3460 8259
(3.44)
6796
(3.80)
7483
(2.20)
165 3565 8400
(3.66)
7602
(2.34)
170 3675 8539
(3.89)
7719
(2.49)
10

Performance Data
VW: Cooling coil capacities (Btuh)
Notes:
 Coil capacity for other than 25 °F T use the following formula:
(trm - tew)/25 x rating at 25 °F T.
 To aide in balancing the water systems, all units regardless of size
have the same pressure drop across the water coils.
 The values in the ( ) indicate the nozzle pressure (inches of wg).
 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.
 All ratings include allowance for lint screens.
 T = trm - tew (trm = room temperature and tew = entering water
temperature).
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 1537
(0.89)
20 432 2022
(1.59)
2080
(0.94)
2098
(0.81)
25 540 2501
(2.48)
2573
(1.47)
2620
(0.97)
2443
(1.26)
2669
(0.74)
30 648 2976
(3.57)
3062
(2.11)
3118
(1.39)
2767
(1.82)
3022
(1.07)
3227
(0.71)
2639
(0.89)
35 756 3546
(2.88)
3611
(1.90)
3592
(1.10)
3074
(2.48)
3357
(1.46)
3585
(0.97)
2902
(1.21)
3204
(0.71)
40 864 4028
(3.76)
4101
(2.48)
4080
(1.44)
3367
(3.24)
3678
(1.91)
3927
(1.26)
4163
(0.73)
3152
(1.58)
3479
(0.94)
2940
(0.92)
45 972 4588
(3.14)
4564
(1.82)
3986
(2.42)
4256
(1.60)
4511
(0.93)
3389
(2.01)
3742
(1.19)
4030
(0.78)
3137
(1.17)
3555
(0.72)
50 1080 5073
(3.88)
5046
(2.25)
4283
(2.99)
4573
(1.97)
4847
(1.14)
3617
(2.48)
3993
(1.46)
4300
(0.96)
4612
(0.56)
3324
(1.45)
3767
(0.89)
3169
(0.95)
55 1188 5526
(2.72)
4570
(3.62)
4880
(2.39)
5173
(1.39)
3836
(3.00)
4235
(1.77)
4561
(1.17)
4892
(0.68)
3503
(1.75)
3970
(1.07)
4289
(0.68)
3328
(1.15)
60 1296 6004
(3.24)
5179
(2.85)
5489
(1.65)
4048
(3.57)
4469
(2.11)
4812
(1.39)
5162
(0.81)
3674
(2.09)
4164
(1.28)
4499
(0.81)
3479
(1.36)
3939
(0.81)
65 1405 5470
(3.34)
5797
(1.94)
4695
(2.48)
5056
(1.63)
5423
(0.95)
3839
(2.45)
4352
(1.50)
4702
(0.95)
3625
(1.60)
4104
(0.95)
70 1512 6098
(2.25)
4915
(2.87)
5293
(1.90)
5677
(1.10)
3999
(2.84)
4533
(1.74)
4897
(1.11)
3765
(1.86)
4263
(1.10)
4683
(0.72)
75 1620 6392
(2.58)
5128
(3.30)
5523
(2.18)
5924
(1.26)
4154
(3.26)
4708
(2.00)
5086
(1.27)
5586
(0.75)
3901
(2.13)
4416
(1.26)
4852
(0.83)
80 1730 6680
(2.94)
5337
(3.76)
5747
(2.48)
6164
(1.44)
4304
(3.71)
4878
(2.27)
5270
(1.45)
5788
(0.86)
4032
(2.43)
4564
(1.44)
5015
(0.95)
85 1838 6962
(3.32)
5966
(2.80)
6399
(1.62)
5043
(2.57)
5449
(1.63)
5984
(0.97)
4159
(2.74)
4709
(1.62)
5173
(1.07)
90 1942 6181
(3.14)
6629
(1.82)
5204
(2.88)
5622
(1.83)
6175
(1.09)
4283
(3.08)
4849
(1.82)
5327
(1.20)
5866
(0.69)
95 2055 6390
(3.50)
6854
(2.03)
5361
(3.21)
5792
(2.04)
6361
(1.21)
4403
(3.43)
4985
(2.03)
5476
(1.34)
6030
(0.77)
100 2160 7074
(2.25)
5514
(3.56)
5958
(2.26)
6543
(1.34)
4521
(3.80)
5118
(2.25)
5622
(1.48)
6191
(0.86)
105 2265 7290
(2.48)
5664
(3.92)
6120
(2.50)
6721
(1.48)
5247
(2.48)
5765
(1.63)
6348
(0.95)
110 2375 7503
(2.72)
6278
(2.74)
6895
(1.63)
5374
(2.72)
5904
(1.79)
6501
(1.04)
115 2482 7711
(2.97)
6433
(2.99)
7065
(1.78)
5498
(2.97)
6040
(1.96)
6651
(1.14)
120 2590 7917
(3.24)
6586
(3.26)
7232
(1.94)
5619
(3.24)
6173
(2.13)
6797
(1.24)
125 2700 8119
(3.51)
6735
(3.54)
7396
(2.10)
5738
(3.51)
6303
(2.32)
6941
(1.34)
130 2810 7558
(2.27)
5854
(3.80)
6431
(2.51)
7082
(1.45)
135 2918 7716
(2.45)
6557
(2.70)
7220
(1.57)
140 3022 7872
(2.64)
6680
(2.91)
7356
(1.69)
145 3130 8025
(2.83)
6802
(3.12)
7490
(1.81)
150 3240 8176
(3.03)
6921
(3.34)
7621
(1.94)
155 3350 8325
(3.23)
7038
(3.56)
7750
(2.07)
160 3460 8471
(3.44)
7154
(3.80)
7877
(2.20)
165 3565 8002
(2.34)
170 3675 8126
(2.49)
11

RIGHT SIDE VIEW
FRONT VIEW
D
3"
3" E
F
PLENUM
END PLUG
OPTIONAL AIR
VENT AVAILABLE
SEE CHART BELOW
FOR OPTIONAL
FITTINGS
OPTIONAL
LINT SCREEN
AVAILABLE
OPTIONAL
CONDENSATE PAN
WITH 11/16" DRAIN
ODF SWEAT
SUPPLY
RETURN
BALANCING
DAMPER ADJUSTMENT
5/16" x 5/8" SLOTS IN
SUSPENSION MTG.
"Z" BARS
TYP (6) PLACES
3 1/2"
4 7/8"
4"
MIN
4 1/2"
3/4"
9 7/8"
10 5/16"
12 11/16"
3 3/16" 6 11/16" 6 11/16" 1"
13/16"
7 3/16"
TYP.
4 1/2"
TYP.
1 5/16"
5 1/4"
22 7/16"
14 1/4"
WALL
3 9/16"
4" O.D.
OPTIONAL TRANSITION
FITTING AVAILABLE
PRIMARY
AIR INLET
All listed dimensions are approximate and are subject to change without notice. Modifications to the product specifications must be accepted
by Hydro-Air at its base office.
Dimensions and data Model H4C
Notes:
Condensate connection mounted same side as coil connection
Four inch minimum distance from wall required to obtain rated
capacity; 8-1/2" minimum for screen removal
Shipping weight includes packaging
Description:
The H4C is shipped from the factory with the following:
Acoustically designed plenum and nozzles as specified
Two 6-tube coils with copper tubes and aluminum fins
Condensate pan as specified
Two Z brackets for mounting unit to a rigid flat horizontal surface
Coil connections as specified
Hardware kit includes:
(8) Mounting screws
(8) Tinnerman nuts
(1) Lint screen clip
Unit size (H4C) 24" 32" 40" 52"
Dimensions (in.)
Drain pan (D) 30-1/4" 38-1/4" 46-1/4" 58-1/4"
Nom. coil (E) 24-1/8" 32" 40" 52"
Z Bar (F) 27-1/8" 35" 43" 55"
Min. free areas (sq. In.)
Discharge grille 81 108 135 175
Recirculation grille 234 288 343 439
Approx. shipping
weight (LB) 38 57 59 73
Optional fittings
Code digit #8 Description
0 1/2" ODF sweat fitting
1 1/2" ODF sweat fitting w/vent
2 1/2" ODM flare fitting
3 1/2" ODM flare fitting w/vent
12 Dimensions and data

Dimensions and data Model HC
RIGHT SIDE VIEW
FRONT VIEW
D
3"
3" E
F
PLENUM
END PLUG
OPTIONAL AIR
VENT AVAILABLE
SEE CHART BELOW
FOR OPTIONAL
FITTINGS
OPTIONAL
LINT SCREEN
AVAILABLE
OPTIONAL
CONDENSATE PAN
WITH 11/16" DRAIN
ODF SWEAT
SUPPLY
RETURN
BALANCING
DAMPER ADJUSTMENT
5/16" x 5/8" SLOTS IN
SUSPENSION MTG.
"Z" BARS
TYP (6) PLACES
3 1/2"
4 7/8"
4"
MIN
7 3/16"
4 1/2" 4 1/2"
3/4"
9 7/8"10 5/16"
11 3/8"
1"6 11/16"6 11/16"3 3/16"
13 7/16"
1 5/8"
21 9/16"
WALL
3 9/16"
4" O.D.
OPTIONAL TRANSITION
FITTING AVAILABLE
PRIMARY
AIR INLET
All listed dimensions are approximate and are subject to change without notice. Modifications to the product specifications must be accepted
by Zehnder Rittling at its base office.
Notes:
Condensate connection mounted same side as coil connection
Four inch minimum distance from wall required to obtain rate
capacity; 8-1/2" minimum for screen removal
Shipping weight includes packaging
Description:
The HC is shipped from the factory with the following:
Acoustically designed plenum and nozzles as specified
One 6-tube coil with copper tubes and aluminum fins
Condensate pan as specified
Two Z brackets for mounting unit to a rigid flat horizontal surface
Coil connections as specified
Hardware kit includes:
(8) Mounting screws
(8) Tinnerman nuts
(1) Lint screen clip
Unit Size (HC) 24" 32" 40" 52"
Dimensions (in.)
Drain pan (D) 30-1/4" 38-1/4" 46-1/4" 58-1/4"
Nom. coil (E) 24-1/8" 32" 40" 52"
Z Bar (F) 27-1/8" 35" 43" 55"
Min. free areas (sq. In.)
Discharge grille 81 108 135 175
Recirculation grille 234 288 343 439
Approx. shipping
weight (LB) 36 45 52 64
Optional fittings
Code digit #8 Description
0 1/2" ODF sweat fitting
1 1/2" ODF sweat fitting w/vent
2 1/2" ODM flare fitting
3 1/2" ODM flare fitting w/vent
13

RIGHT SIDE VIEW
FRONT VIEW
BALANCING
DAMPER ADJUSTMENT
D
E2 5/8"
PLENUM
END PLUG
OPTIONAL AIR
VENT AVAILABLE
SEE CHART BELOW
FOR OPTIONAL
FITTINGS
OPTIONAL
LINT SCREEN
AVAILABLE
OPTIONAL
CONDENSATE PAN
WITH 11/16" DRAIN
ODF SWEAT
SUPPLY
RETURN
(DISCH)
3 1/2"
2 1/4"
8 13/16"
12 1/4"
1 7/16"
23"
1 9/16"
2 15/16"
18 5/8"
3/4"
3 5/8"
WALL
LEVELING
SCREW
BOTH ENDS
4" O.D.
3 9/16"
OPTIONAL TRANSITION
FITTING AVAILABLE
PRIMARY
AIR INLET
Dimensions and data Model V2H
All listed dimensions are approximate and are subject to change without notice. Modifications to the product specifications must be accepted
by Zehnder Rittling at its base office.
Notes:
Condensate connection mounted same side as coil connection
Shipping weight includes packaging
Description:
The V2H is shipped from the factory with the following:
Acoustically designed plenum and nozzles as specified
One 12-tube coil with copper tubes and aluminum fins
Condensate pan as specified
Coil connections as specified
Recovery stack and drain pan assembled and ready for
wall mounting
Hardware kit includes:
(2) Leveling screws
(2) Leveling screw clips
(4) Lint screen clips
(2) Coil condensate plates with clips
Unit Size (V2H) 24" 32" 40" 52"
Dimensions (in.)
Drain pan (D) 29-1/2" 37-1/2" 45-1/2" 57-1/2"
Nom. coil (E) 24-1/8" 32" 40" 52"
Z Bar (F) 3 inches
Min. free areas (sq. In.)
Discharge grille 81 108 135 175
Recirculation grille 473 630 788 1023
Approx. shipping
weight (LB) 35 43 52 66
Optional fittings
Code digit #8 Description
0 1/2" ODF sweat fitting
1 1/2" ODF sweat fitting w/vent
2 1/2" ODM flare fitting
3 1/2" ODM flare fitting w/vent
14 Dimensions and dataDimensions and data

Dimensions and data Model V4H
RIGHT SIDE VIEW
FRONT VIEW
BALANCING
DAMPER ADJUSTMENT
E3 1/16"
D
PLENUM
END PLUG
OPTIONAL AIR
VENT AVAILABLE
SEE CHART BELOW
FOR OPTIONAL
FITTINGS
OPTIONAL
LINT SCREEN
AVAILABLE
OPTIONAL
CONDENSATE PAN
WITH 11/16" DRAIN
ODF SWEAT
SUPPLY
RETURN
(DISCH)
3 1/2"
2 1/4"
10 5/16"
12 1/4"
1 7/16"
23"
1 9/16"
3/4"
8 7/16"
1 1/2"
3 5/8"
WALL
LEVELING
SCREW
BOTH ENDS
4" O.D.
3 9/16"
OPTIONAL TRANSITION
FITTING AVAILABLE
PRIMARY
AIR INLET
RETURN
SUPPLY
All listed dimensions are approximate and are subject to change without notice. Modifications to the product specifications must be accepted
by Zehnder Rittling at its base office.
Notes:
Condensate connection mounted same side as cooling coil
connection
Shipping weight includes packaging
Orientation of coil connections to be determined
Inner coil is always for cooling and determines whether it is RH or
LH connections. Heating coil connections are opposite of cooling
connections
Description:
The V4H shipped from the factory with the following:
Acoustically designed plenum and nozzles as specified
Two 6-tube coil with copper tubes and aluminum fins
Condensate pan as specified
Coil connections as specified
Recovery stack and drain pan, assembled ready for wall mounting
Hardware kit includes:
(2) Leveling screws
(2) Leveling screw clips
(4) Lint screen clips
(2) Coil condensate plates with clips
Unit Size (V4H) 24" 32" 40" 52"
Dimensions (in.)
Drain pan (D) 29-1/2" 37-1/2" 45-1/2" 57-1/2"
Nom. coil (E) 24-1/8" 32" 40" 52"
Min. free areas (sq. in.)
Discharge grille 81 108 135 175
Recirculation grille 237 315 394 512
Approx. shipping
weight (LB) 37 45 55 70
Optional fittings
Code digit #8 Description
0 1/2" ODF sweat fitting
1 1/2" ODF sweat fitting w/vent
2 1/2" ODM flare fitting
3 1/2" ODM flare fitting w/vent
15

RIGHT SIDE VIEW
FRONT VIEW
BALANCING
DAMPER ADJUSTMENT
E
D
3 1/16"
PLENUM
END PLUG
OPTIONAL AIR
VENT AVAILABLE
SEE CHART BELOW
FOR OPTIONAL
FITTINGS
OPTIONAL
LINT SCREEN
AVAILABLE
OPTIONAL
CONDENSATE PAN
WITH 11/16" DRAIN
ODF SWEAT
SUPPLY
RETURN
RETURN
SUPPLY
3 1/2"
2 1/4"
7 1/16"
11"
4 1/2"
8 7/16"
3/4"
2 7/16"
12 1/4"
3/4"
1 1/4"
1 9/16"
WALL
LEVELING
SCREW
BOTH ENDS
4" O.D.
3 9/16"
OPTIONAL TRANSITION
FITTING AVAILABLE
PRIMARY
AIR INLET
Dimensions and data Model V4L
All listed dimensions are approximate and are subject to change without notice. Modifications to the product specifications must be accepted
by Zehnder Rittling at its base office.
Notes:
Condensate connection mounted same side as cooling coil
connection
Shipping weight includes packaging
Orientation of coil connections to be determined
Inner coil is always for cooling and determines whether it is RH or
LH connections. Heating coil connections are opposite of cooling
connections
Description:
The V4L is shipped from the factory with the following:
Acoustically designed plenum and nozzles as specified
Two 6-tube coils with copper tubes and aluminum fins
Condensate pan as specified
Coil connections as specified
Hardware kit includes:
(2) Leveling screws
(2) Leveling screw clips
(4) Lint screen clips
(2) Coil condensate plates with clips
Unit Size (V4L) 24" 32" 40" 52"
Dimensions (in.)
Drain pan (D) 29-1/2" 37-1/2" 45-1/2" 57-1/2"
Nom. coil (E) 24-1/8" 32" 40" 52"
Min. free areas (sq. in.)
Discharge grille 81 108 135 175
Recirculation grille 124 165 206 269
Approx. shipping
weight (LB) 26 31 36 47
Optional fittings
Code digit #8 Description
0 1/2" ODF sweat fitting
1 1/2" ODF sweat fitting w/vent
2 1/2" ODM flare fitting
3 1/2" ODM flare fitting w/vent
16 Dimensions and data

FRONT VIEW
D
E3 1/16"
RETURN
SUPPLY SUPPLY
RETURN
PRIMARY
AIR INLET
OPTIONAL
CONDENSATE PAN
WITH 11/16" DRAIN
ODF SWEAT
PLENUM
END PLUG BALANCING
DAMPER
ADJUSTMENT
SEE CHART BELOW
FOR OPTIONAL
FITTINGS
OPTIONAL AIR VENT
AVAILABLE
OPTIONAL
ACCESSORY
LINT SCREEN
3 9/16"
4" O.D.
OPTIONAL TRANSITION
FITTING AVAILABLE
RIGHT SIDE VIEW
2 1/4"
7 1/4"
8 13/16"
3 1/2"
2 1/2"
3" MIN
4 1/2"
7 3/16"
13/16"
4 1/2"
22 7/8"
1 5/16"
1 1/4"
FLOOR
HEATING
COIL
COOLING
COIL
WALL
Dimensions and data Model V4W
All listed dimensions are approximate and are subject to change without
notice. Modifications to the product specifications must be accepted
by Zehnder Rittling at its base office.
Notes:
Condensate connection mounted same side as cooling coil
connection
Shipping weight includes packaging
Orientation of coil conenctions to be determined
Inner coil is always for cooling and determines whether it is RH
or LH connections. Heating coil connections are opposite of cooling
connections
Description:
The V4W is shipped from the factory with the following:
Acoustically designed plenum and nozzles as specified
One 6-tube coil with copper tubes and aluminum fins
Condensate pan as specified
Coil connections as specified
Hardware kit includes:
(2) Leveling screws
(2) Leveling screw clips
(4) Lint screen clips
(2) Coil condensate plates with clips
Unit Size (V4W) 24" 32" 40" 52"
Dimensions (in.)
Drain pan (D) 29-3/8" 37-3/8" 45-3/8" 57-3/8"
Nom. coil (E) 24-1/8" 32" 40" 52"
Min. height from floor 3 inches
Min. free areas (sq. in.)
Discharge grille 81 108 135 175
Recirculation grille 237 315 394 512
Approx. shipping
weight (LB) 37 47 55 69
Optional fittings
Code digit #8 Description
0 1/2" ODF sweat fitting
1 1/2" ODF sweat fitting w/vent
2 1/2" ODM flare fitting
3 1/2" ODM flare fitting w/vent
17

RIGHT SIDE VIEW
(DISCH)
3 1/2"
2 1/4"
8 13/16"
12 1/4"
8 7/16"
1 7/16"
23"
1 9/16"
3/4"
3 5/8"
WALL
LEVELING
SCREW
BOTH ENDS
FRONT VIEW
BALANCING
DAMPER ADJUSTMENT
D
E2 5/8"
PLENUM
END PLUG
SEE CHART BELOW
FOR OPTIONAL
FITTINGS
OPTIONAL
LINT SCREEN
AVAILABLE
OPTIONAL
CONDENSATE PAN
WITH 11/16" DRAIN
ODF SWEAT
SUPPLY
RETURN
4" O.D.
3 9/16"
OPTIONAL TRANSITION
FITTING AVAILABLE
PRIMARY
AIR INLET
Dimensions and data Model VH
All listed dimensions are approximate and are subject to change without notice. Modifications to the product specifications must be accepted
by Zehnder Rittling at its base office.
Notes:
Condensate connection mounted same side as coil connection
Shipping weight includes packaging
Description:
The VH is shipped from the factory with the following:
Acoustically designed plenum and nozzles as specified
One 6-tube coil with copper tubes and aluminum fins
Condensate pan as specified
Coil connections as specified
Recovery stack and drain pan, assembled and ready for wall
mounting
Hardware kit includes:
(2) Leveling screws
(2) Leveling screw clips
(4) Lint screen clips
(2) Coil condensate plates with clips
Unit Size (VH) 24" 32" 40" 52"
Dimensions (in.)
Drain pan (D) 29-1/2" 37-1/2" 45-1/2" 57-1/2"
Nom. coil (E) 24-1/8" 32" 40" 52"
Min. height from floor 3 inches
Min. free areas (sq. in.)
Discharge grille 81 108 135 175
Recirculation grille 237 315 394 512
Approx. shipping
weight (LB) 32 40 48 61
Optional fittings
Code digit #8 Description
0 1/2" ODF sweat fitting
1 1/2" ODF sweat fitting w/vent
2 1/2" ODM flare fitting
3 1/2" ODM flare fitting w/vent
18 Dimensions and data