constant volume regulators · constant volume regulator models: cvr, cvrh, cvrl, cvr-t, cvr-gm and...
TRANSCRIPT
• Automatically responds to Varying Duct Pressures
• CVR Models for Standard, Low and High Pressure
Applications
The Nailor Constant Volume Regulator (CVR) is an extremely cost-effective way to precisely control
the airflow in HVAC systems – especially high-rise buildings (such as exhaust shafts) – without
the need for controls or sensors. The CVR is a pressure independent self-regulating damper which
adjusts to maintain a constant set airflow.
CONSTANT VOLUMEREGULATORS
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• Minimizes Building Stack Effect
• Conserves Energy
The Nailor Constant Volume Regulator (CVR) is an extremely cost-effective way to precisely control
CVR-SP, CVR-LP, CVR-HPThe CVR contains a blade and spring piston which self-adjust to maintain the preset constant airflow volume. They adjust automatically for variable duct pressures caused by building pressure, thermal stack effect, dust buildup and other variable adverse conditions. The CVR can be used in either supply or exhaust applications by simply placing the factory mounted collar-side against the airflow direction in all models offered.
Operational Static Pressure Ranges:CVR-SP Standard Pressure – 0.2" to 0.8" w.g. (50 to 200 Pa)CVR-LP Low Pressure – 0.08" to 0.4" w.g. (20 to 100 Pa)CVR-HP High Pressure – 0.6" to 2.4" w.g. (148 to 597 Pa)
CVR-FDThe CVR-FD is the Constant Volume Regulator assembled with a UL 555 Listed 1-1/2 hour static or dynamic curtain fire damper. This model is available for supply or exhaust applications. This labor saving model is complete, requires no rear retaining angles, and reduces installation time.
CVR-GMThe CVR-GM is the Constant Volume Regulator in a flanged box for grille mount purposes (factory supplied or by others). This model is available for supply or exhaust applications. Used in applications where fire dampers are not required, this model comes preassembled for quick and easy installation.
CVR-TThe CVR-T is the Constant Volume Regulator with a square or round transition collar on either side, allowing for any duct shape application. The CVR features a blade and spring piston which self-adjust to maintain the preset constant airflow volume.
CVR-FD
SIZE (NOMINAL)
C DEPTH
DDIA.
4" (102) 2.8" (70) 3.7" (94)5" (127) 3.4" (86) 4.625" (117)6" (152) 3.6" (91) 5.9" (150)8" (203) 3.6" (91) 7.7" (196)
10" (254) 5.0" (127) 9.625" (244)
SIZING:PERFORMANCE CURVESSTANDARD PRESSURE
* set point numbers on regulator are in m3/H
Sample of airflow setting: Set Point Mark 140 = 140 m3/H = 83 CFM
265 − 470 CFM900850800750700650600550500450
M�/h*530500470441412382353325295265
CFM SET POINT (CFM)800 (470)
750 (441)
700 (412)
650 (382)600 (358)550 (325)500 (295)450 (265)
"w.g. 0.2 0.4 0.6 0.8 1.0 PRESSURE DIFFERENCE
175 − 295 CFM600
550
500
450
400
350
300
250
M�/h*350
325
295
265
235
206
175
147
CFM SET POINT (CFM)500 (295)
450 (265)
400 (235)
350 (206)
300 (175)
"w.g. 0.2 0.4 0.6 0.8 1.0 PRESSURE DIFFERENCE
105 − 175 CFM350330310290270250230210190170
M�/h*206194182171160148136124112100
CFM SET POINT (CFM)300 (175)
270 (160)
240 (141)
210 (124)180 (105)
"w.g. 0.2 0.4 0.6 0.8 1.0 PRESSURE DIFFERENCE
60 − 105 CFM230
210
190
170
150
130
110
90
M�/h*135
124
112
100
88
77
65
53
CFM SET POINT (CFM)
180 (106)
150 (88)
120 (70)100 (60)
"w.g. 0.2 0.4 0.6 0.8 1.0 PRESSURE DIFFERENCE
30 − 60 CFM
120
100
80
60
40
M�/h*
70
60
47
35
24
CFM SET POINT (CFM)
100 (60)
90 (53)
75 (44)
60 (35)
50 (30)
"w.g. 0.2 0.4 0.6 0.8 1.0 PRESSURE DIFFERENCE
SIZE (NOMINAL) FLOW RATE RANGE (CFM)
4" (102) 30-60 − − − −
5" (127) 30-60 60-105 − − −
6" (152) 30-60 60-105 105-175 − −
8" (203) − 60-105 105-175 175-295 −
10" (254) − − 105-175 175-295 265-470
AIRFLOW:
When choosing a CVR model, select the appropriate size for your building needs. Then select the desired flow rate range among those available for your size.
For adjusting your CVR, reference our performance curve table and choose your maximum desired flow rate versus pressure. Choose a Set Point on the CVR that best matches that flow rate (see graphic for example). Using a Torx T-10 bit, loosen the adjustment screw. Re-tighten the screw when the self-adjusting aerowing lines up with desired Set Point.
THERMAL STACK EFFECT Without the use of a CVR there can be what is called "Stack Effect". Stack Effect is an imbalance of exhaust airflow from floor to floor due to varying pressure changes, creating an inefficient and imbalanced exhaust system throughout the building. This can create stale or uncomfortable settings and be costly. The CVR eliminates Stack Effect by automatically adjusting to these varying pressures, creating equalized airflow and exhaust among all floors.
WCVR 10.20
Each size is supplied with factory installed shims where necessary to achieve different airflow ranges. See the graphic for an example and the chart for a detailed total assembly.
Size (Nominal)
FLOW RATE (CFM)
TOTAL ASSEMBLY
4" (102) 30-60 4" (102) Regulator5" (127) 30-60 4" (102) Regulator + 1 Shim5" (127) 60-105 5" (127) Regulator6" (152) 30-60 4" (102) Regulator + 2 Shim6" (152) 60-105 5" (127) Regulator + 1 Shim6" (152) 105-175 6" (152) Regulator8" (203) 60-105 5" (127) Regulator + 2 Shims8" (203) 105-175 6" (152) Regulator + 1 Shim8" (203) 175-295 8" Regulator
10" (254) 105-175 6" (152) Regulator + 2 Shims10" (254) 175-295 8" Regulator + 1 Shim10" (254) 265-470 10 Regulator
-100-120-140-160-180
110-130-150-170-
-180-200-220-240-260-280-300
190-210-230-250-270-290-
-300-350-400-450-500
320-370-420-470-
8" 175-195 CFM(8" regulator)
8" 105-175 CFM(6" regulator + 1 Shim)
8" 60-105 CFM(5" regulator + 2 Shims)
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45 CFM
45 CFM
45 CFM
45 CFM
45 CFM
160 CFM
126 CFM
84 CFM
42 CFM
0 CFM
WITHOUT CVR WITH CVR