Bard QW5S1, QW4S1, QW3S1, QW2S1 Cooling Tower / Boiler Application, Water Flow and Pressure Drop

Page 38

WARNING

Thin ice may result in the vicinity of the discharge line.

For complete information on water well systems and lake and pond applications, refer to Manual 2100-078 available from your distributor.

COOLING TOWER / BOILER

APPLICATION

The cooling tower and boiler water loop temperature is usually maintained between 50°F to 100°F to assure adequate cooling and heating performance.

In the cooling mode, heat is rejected from the unit into the source water loop. A cooling tower provides evaporative cooling to the loop water thus maintaining a constant supply temperature to the unit. When utilizing open cooling towers chemical water treatment is mandatory to ensure the water is free from corrosive minerals.

It is imperative that all air be eliminated from the source closed loop side of the heat exchanger to insure against fouling.

In the heating mode, heat is absorbed from the source water loop. A boiler can be utilized to maintain the loop at the desired temperature. In milder climates a “flooded tower” concept is often used. This concept involves adding makeup water to the cooling tower sump to maintain the desired loop temperature.

CAUTION

Water piping exposed to extreme low ambient temperatures are subject to freezing.

Units are equipped with double O-ring (female pipe thread) fittings. Consult the specification sheets for sizes. Teflon tape sealer should be used when connection to the unit to insure against leaks and possible condenser fouling. Do not overtighten the connections. Flexible hoses should be used between the unit and the rigid system to avoid possible vibration. Ball valves should be installed in the supply and return lines for unit isolation and unit water flow rate balancing.

Pressure / temperature ports are recommended in both supply and return lines for system flow balancing. Water flow can be accurately set by measuring the refrigerant to water heat exchangers water side pressure drop. See Table 8 for water flow and pressure drop information.

TABLE 8

WATER FLOW AND PRESSURE DROP

 

 

QW2S1 &

 

 

 

 

 

 

 

QW3S1

QW4S1

QW6S1

 

 

 

 

 

 

 

 

 

 

 

GPM

PSIG

Ft. Hd.

PSIG

Ft. Hd.

PSIG

Ft. Hd.

 

 

 

 

 

 

 

 

 

 

 

3

0.1

0.23

 

 

 

 

 

 

4

0.5

1.15

0.9

2.08

 

 

 

 

5

1.2

2.77

1.4

3.23

 

 

 

 

6

1.7

3.92

2.3

5.31

 

 

 

 

7

2.3

5.31

3.2

7.38

2

4.61

 

 

 

 

 

 

 

 

 

 

 

8

3.1

7.15

4.1

9.46

2.5

5.77

 

 

 

 

 

 

 

 

 

 

 

9

4.1

9.46

5.1

11.77

3.2

7.38

 

 

 

 

 

 

 

 

 

 

 

10

 

 

6.1

14.07

3.9

9.00

 

 

11

 

 

7.1

16.38

4.7

10.84

 

 

12

 

 

8.2

18.92

5.5

12.69

 

 

13

 

 

9.4

21.69

6.4

14.76

 

 

14

 

 

10.6

24.45

7.3

16.84

 

 

15

 

 

 

 

8.1

18.69

 

 

16

 

 

 

 

9

20.76

 

 

17

 

 

 

 

9.9

22.84

 

 

18

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Manual

2100-532B

Page

38 of 46

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Contents QW2S1 QW3S1 QW4S1 QW5S1 Bryan, OhioContents Figures Getting Other Information and Publications For More INFORMATION, Contact These PublishersElectrical Specifications QW Model NomenclatureUnit Dimensions Handling Unit After Removal from Skid Shipping DamageUnit Removal from Skid Removal of Unit from SkidProper Handling of Unit After Removal from Skid Minimum Installation HeightGeneral Installation of Unit Through Wall with Wall Sleeve Installation with Free Blow Plenum Ducted ApplicationCondensate Drain Duct WorkFilters Supply Duct ConnectionsCondensate Drain Optional Rear DrainRear Drain TOP View Commercial Room Ventilator OptionTEC Energy Recovery Ventilator Option Removal of the Q-TEC Energy Recovery VentilatorRemoving Locking Screws from Wheels Installation InstructionsMounting the Unit Unit Mounting Without Ventilation Wall Sleeve Component Location Operating Voltage Range Wiring Main PowerWiring LOW Voltage Wiring Wall ThermostatsLOW Voltage Connections for DDC Control Blower Motor LOW Voltage Wire Harness PlugLOW Voltage Connections Remote Thermostat Wiring Diagram Option 24VACRemote Thermostat Wiring Diagram Thermostat Option Plug #1 Description of Standard Equipment AdjustmentsStart UP Compressor Control ModulePhase Monitor Optional CFM Service HintsImportant Installer Note Delay on Make TimingIndoor Blower Performance Pressure Service PortsPiping Access to Unit Opening Rear of Unit Fluid Access From Floor Fluid Connections on Unit with Ventilation Wall SleeveFluid Connections on Unit Without Ventilation Wall Sleeve Pressure Table Flow Rate for Various FluidsOptional Accessories Circulation System Circulation System DesignCopper Water Coil Application Start UP Procedure for Closed Loop System Water Temperature and Pressure ProcedurePerformance Model DORFC-1 Loop Pump Module Performance Model DORFC-2 Loop Pump ModuleConstant Flow Valves Piping DiagramWater Connections System Start UP Procedure for Open Loop Applications Well Pump SizingRemedies of Water Problems Water CorrosionLake and Pond Installations Cleaning Water CoilWater Well System Cooling Tower / Boiler Application Water Flow and Pressure DropWater Source Heat Pump Water Source Heat Pump Service Unbrazing System ComponentsTroubleshooting GE ECM Motors Don’tTroubleshooting GE ECM Motors CONT’D Replacing ECM Control ModuleCommon Cause Occasional Cause Denotes Ground Source Heat Pump Performance Report Following Information is Needed To Check Performance of Unit
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