Trane CAB-PRC001-EN manual Selecting the Correct Modulating Valve Size

Page 17

General Data

Selecting the Correct

Modulating Valve Size

Modulating valves are available in any of four port sizes. These four port sizes relate to a Cv of 0.7, 1.5, 2.5 or 4.0, which is the coefficient of flow. The coefficient of flow is defined as the volume of water flow through a control valve in the fully open position with a 1 psig (6.895 kPa) differential across the valve. It is calcu- lated using the following formula:

Cv = Q/Square root ∆P where: Cv = flow coefficient

Q = flow rate (GPM)

∆P = pressure drop across the valve or coil (psig).

For good control, the valve Cv should be approximately equal to the Cv of the water coil.

Modulating Valve Selection Example Assume a size 06 cabinet heater is selected to operate at the following conditions:

Vertical cabinet cabinet heater

Entering water temperature = 180 F (82 C) Leaving water temperature = 150 F ( C) EAT = 70 F (21 C)

The coil is selected as a four-row coil. Select the best modulating valve size for this unit.

1

Find the ∆P across the water coil. Refer to the ARI performance table to determine the ∆P across the water coil or use the Trane Official Product Selection System, TOPSS™, selection program. The water pressure drop is found to be 5.7’ (17.0 kPa) of water at a flow rate of 3.59 gpm. This converts to a pressure drop of 2.47 psig (1.0 feet of water = 0.4328 psig.)

2

Calculate the Cv of the water coil. Cv = GPM/Square root ∆P.

Cv = 3.59/Square root 2.47 Cv = 2.29

Therefore, select the valve with the Cv of

2.5since it is closest to the Cv of the water coil. The following tables illustrate possible valve selections at ARI condi- tions for horizontal concealed units with a high static motor and vertical cabinet units with a free discharge motor. For other applications, use TOPSS to determine the flowrate and make calculations using the formulas above.

Table GD-3. Modulating Valve Selections for Horizontal Concealed Units, High Static Motor, 70 F (21 C) EAT, 180 F (82 C) EWT, 30 F (-1 C) ∆T

Unit

 

 

Coil

Coil

Valve

Size

Coil

GPM (L/s)

WPD (kPa)

Cv

Cv

 

2-Row

1.19 (0.08)

6.0

(17.8)

0.74

0.7

02

3-Row

1.52 (.10)

13.8

(41.2)

0.62

0.7

 

4-Row

1.59 (.10)

3.8

(11.5)

1.24

1.5

 

2-Row

1.53 (.10)

10.3

(30.8)

0.72

0.7

03

3-Row

1.82 (.11)

4.3

(12.8)

1.33

1.5

 

4-Row

1.98 (.12)

6.2

(18.6)

1.21

1.5

 

2-Row

1.73 (.11)

3.3 (9.8)

1.45

1.5

04

3-Row

2.57 (.16)

9.1

(27.0)

1.29

1.5

 

4-Row

2.81 (.18)

13.4

(39.9)

1.17

1.5

 

2-Row

2.87 (.18)

9.9

(29.5)

1.39

1.5

06

3-Row

3.96 (.25)

5.9

(17.7)

2.48

2.5

 

4-Row

4.37 (.28)

8.2

(24.6)

2.32

2.5

 

2-Row

3.71 (.23)

4.7

(14.2)

2.60

2.5

08

3-Row

4.74 (.30)

9.1

(27.1)

2.39

2.5

 

4-Row

5.22 (.33)

12.7

(37.8)

2.23

2.5

 

2-Row

4.71 (.30)

8.1

(24.1)

2.52

2.5

10

3-Row

6.50 (.41)

18.1

(54.0)

2.32

2.5

 

4-Row

7.13 (.45)

25.3

(75.6)

2.15

2.5

 

2-Row

5.48 (.35)

11.4

(34.0)

2.47

2.5

12

3-Row

7.19 (.45)

14.5

(43.2)

2.87

2.5

 

4-Row

7.83 (.51)

10.5

(31.4)

3.67

4.0

Table GD-4. Modulating Valve Selections for Vertical Cabinet Units, Free Discharge Motor, 70 F (21 C) EAT, 180 F (82 C) EWT, 30 F (-1 C) ∆T

Unit

 

 

Coil

Coil

Valve

Size

Coil

GPM (L/s)

WPD (kPa)

Cv

Cv

 

2-Row

1.06 (.07)

4.8

(14.4)

0.74

0.7

02

3-Row

1.31 (.08)

10.5 (31.4)

0.61

0.7

 

4-Row

1.34 (.08)

2.8 (8.4)

1.22

1.5

 

2-Row

1.40 (.09)

8.8

(26.3)

0.72

0.7

03

3-Row

1.70 (.11)

3.8

(11.3)

1.33

1.5

 

4-Row

1.81 (.11)

5.3

(15.7)

1.20

1.5

 

2-Row

1.71 (.11)

3.2 (9.5)

1.45

1.5

04

3-Row

2.12 (.13)

6.4

(19.0)

1.27

1.5

 

4-Row

2.28 (.14)

9.1

(27.3)

1.15

1.5

 

2-Row

2.70 (.17)

8.9

(26.5)

1.38

1.5

06

3-Row

3.31 (.21)

4.2

(12.6)

2.46

2.5

 

4-Row

3.59 (.23)

5.7

(17.0)

2.29

2.5

 

2-Row

3.39 (.21)

4.0

(11.9)

2.58

2.5

08

3-Row

4.11 (.26)

6.9

(20.7)

2.38

2.5

 

4-Row

4.45 (.28)

9.4

(28.1)

2.21

2.5

 

2-Row

4.32 (.27)

6.8

(20.4)

2.52

2.5

10

3-Row

5.55 (.35)

13.4 (40.2)

2.30

2.5

 

4-Row

6.00 (.38)

18.3 (54.8)

2.13

2.5

 

2-Row

4.99 (.32)

9.6

(28.6)

2.45

2.5

12

3-Row

6.10 (.38)

10.5 (31.4)

2.86

2.5

 

4-Row

6.48 (.42)

7.3 (21.8)

3.65

4.0

CAB-PRC001-EN

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Contents December Force-Flo Cabinet HeaterIt isn’t just a fan and a coil… Contents Features and Benefits Selection ProcedureModel Number DescriptionDigit 28 Not Used Digit 27 Main Control ValveDigit 29 Piping Packages Digit 30 Control TypeUnit General Data ConfigurationsModel a Vertical Concealed Model B Vertical CabinetModel C Horizontal Concealed Fresh Air Outlet Model D Horizontal CabinetOutlet Inlet Model F Vertical Wall Hung Cabinet General Data Unit ConfigurationsModel E Horizontal Recessed Vertical Recessed Model HModel J Vertical Cabinet Slope TopModel N Inverted Vertical Recessed General DataModel M Inverted Vertical Cabinet Table GD-2. Cabinet Heater Air Flow Table GD-1. Force-Flo Cabinet Heater General DataElectric Heat Electric HeatPiping Packages Factory-Installed Piping PackagesPiping Package Options General DataSelecting the Correct Modulating Valve Size Hot Water PerformanceData CoilsTable PD-3. Free Discharge Motor, Group Table PD-2. Free Discharge Motor, GroupTable PD-4. Free Discharge Motor, Group Table PD-6. High Static Motor, Group Table PD-5. High Static Motor, GroupTable PD-7. Free Discharge Motor, Group Performance Steam DataCoilsTable PD-8. Free Discharge Motor, Group Table PD-9. Free Discharge Motor, GroupTable PD-12. Steam Properties Table PD-10. High Static Motor, GroupTable PD-11. High Static Motor, Group Controls Manual Fan Mode SwitchControl Options Tracer ControlsSequence of Operation SequenceControls Operation Table C-2. Controller Function Summary General Controls InformationTable C-1. Controller Input/Output Summary Controls Options Zone SensorZone Sensor Options ZN.010ZN.520 Additional Features Controls FeaturesControl Features Control Valve Two-Position Fresh Air Damper Actuator End Device OptionsTwo-Position Control Valves Units with Electric Heat Electrical DataCalculating MCA Calculating MFSRPM Table ED-6. Two-Stage Electric Heat Digit 18 = U Table ED-8. Single Stage, Low kW Electric Heat Digit 18 = Table ED-7. Single-Stage, Max kW Electric Heat Digit 18 = NTable DW-2. Shipping Weights lbs. kg Dimensions WeightsTable DW-1. Operating Weights lbs. kg Vertical Concealed Unit Dimensions DimensionsVertical ConcealedVertical Cabinet, Model B Vertical Cabinet Unit DimensionsHorizontal Concealed, Model C Horizontal Concealed Unit DimensionsHorizontal Horizontal Cabinet, Model D Horizontal Cabinet Unit DimensionsCabinet Horizontal Recessed, Model E Horizontal Recessed Unit DimensionsRecessed Vertical Wall Hung Cabinet, Model F Vertical Wall Hung Cabinet Unit DimensionsWall Hung Vertical Recessed, Model H Vertical Recessed Unit DimensionsVertical Slope Top, Model J Vertical Slope Top Unit DimensionsSlope Top Inverted Vertical Cabinet, Model M Inverted Vertical Cabinet Unit DimensionsInverted Vertical Inverted Vertical Recessed, Model N Inverted Vertical Recessed Unit DimensionsConnections CoilCoil Connections Vertical Units Horizontal Units Inverted UnitsOpening Fresh Air Opening Dimensions, Horizontal UnitsFresh Air Fresh Air Opening Dimensions, Vertical Units Continuous Mortar Ribs TOP and Bottom Wall BoxProjection Panel Dimensions Projection PanelProjection Panel Dimensions Mechanical Specifications Filters Electric Heat CoilFresh Air Damper Manual DamperMechanical Specifications Options Recessing Flanges False BacksAluminum Wall Boxes Projection PanelsAuto Circuit Setter Piping Components Ball ValveManual Circuit Setter Balance Fitting Control ValveUnion StrainerTrane Company Division of American Standard Inc

CAB-PRC001-EN specifications

The Trane CAB-PRC001-EN is an advanced control system designed to enhance the efficiency and performance of commercial heating, ventilation, and air conditioning (HVAC) systems. This building automation system plays a crucial role in optimizing indoor climate conditions while maximizing energy savings.

One of the standout features of the CAB-PRC001-EN is its capability for real-time monitoring and control. The system integrates seamlessly with various HVAC components, allowing users to adjust settings, schedules, and operational modes from a centralized interface. This flexibility ensures that building managers can respond promptly to changes in occupancy or external weather conditions, optimizing comfort while minimizing energy consumption.

The CAB-PRC001-EN employs a robust set of advanced technologies aimed at enhancing system reliability. Utilizing adaptive control algorithms, it intelligently balances heating and cooling loads across different zones, ensuring a consistent temperature environment throughout the building. The system can quickly adapt to variable load conditions, improving energy efficiency and reducing wear on equipment.

Another defining characteristic is its commitment to user-friendly operation. The intuitive interface utilizes a clear graphical display, making navigation straightforward for users of all skill levels. Furthermore, the system can be accessed remotely through web-enabled devices, providing convenience and flexibility for building managers who are often on the move.

Integration capabilities are another hallmark of the CAB-PRC001-EN. It is designed to work with a multitude of third-party devices and protocols, enabling a comprehensive building management solution. This compatibility allows for smooth communication between different systems, including lighting, security, and fire safety systems, fostering an environment of enhanced operational efficiency.

In addition, the CAB-PRC001-EN supports advanced analytics and reporting features. Users can generate detailed reports on energy usage, system performance, and maintenance needs, enabling informed decision-making that can lead to further energy savings and improved system longevity.

In summary, the Trane CAB-PRC001-EN control system is a cutting-edge solution designed for commercial buildings, offering a combination of real-time monitoring, advanced control technologies, user-friendly interfaces, seamless integration capabilities, and powerful analytics. This makes it an ideal choice for any organization looking to enhance their HVAC operations while promoting sustainability and energy efficiency.
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