Bard QW3S1, QW4S1, QW5S1, QW2S1 Water Connections, Constant Flow Valves, Piping Diagram

Page 33

OPEN LOOP (Well System Applications)

WATER CONNECTIONS

It is very important that an adequate supply of clean, noncorrosive water at the proper pressure be provided before the installation is made. Insufficient water, in the heating mode for example, will cause the low pressure switch to trip, shutting down the heat pump. In assessing the capacity of the water system, it is advisable that the complete water system be evaluated to prevent possible lack of water or water pressure at various household fixtures whenever the heat pump turns on. All plumbing to and from the unit is to be installed in accordance with local plumbing codes. The use of plastic pipe, where permissible, is recommended to prevent electrolytic corrosion of the water pipe. Because of the relatively cold temperatures encountered with well water, it is strongly recommended that the water lines connecting the unit be insulated to prevent water droplets form condensing on the pipe surface.

Refer to piping, Figure 23. Slow closing Solenoid Valve (6) with a 24V coil provides on/off control of the water flow to the unit. Refer to the wiring diagram for correct hookup of the valve solenoid coil.

Constant Flow Valve (7) provides correct flow of water to the unit regardless of variations in water pressure. Observe the water flow direction indicated by the arrow on the side of the valve body. Table 7 is a table showing the flow rate of each valve. Two constant flow rate valves may be installed in parallel to increase the flow. For example, when a 8603-007 (6 GPM) and 8603-011 (5 GPM) are installed in parallel the total flow will be 11 GPM.

TABLE 7

CONSTANT FLOW VALVES

 

Min. Available

Flow Rate

Part No.

Pressure PSIG

GPM

 

 

 

CFV-5

15 1

5

 

 

 

CFV-6

15 1

6

 

 

 

CFV-7

15 1

7

 

 

 

CFV-9

15 1

9

 

 

 

1The pressure drop through the constant flow valve will vary depending on the available pressure ahead of the valve. Unless minimum of 15 psig is available immediately ahead of the valve, no water will flow.

Strainer (5) installed upstream of constant flow valve

(7)to collect foreign material which would clog the flow valve orifice.

Figure 22 shows the use of shutoff valves (9) and (11), on the in and out water lines to permit isolation of the unit from the plumbing system should future service work require this. Globe valves should not be used as shutoff valves because of the excessive pressure drop inherent in the valve design. Instead use gate or ball valves as shut-offs so as to minimize pressure drop.

Drain cock (8) and (10), and tees have been included to permit acid cleaning the refrigerant-to-water coil should such cleaning be required. See WATER CORROSION section.

Drain cock (12) provides access to the system to check water flow through the constant flow valve to insure adequate water flow through the unit. A water meter is used to check the water flow rate.

FIGURE 23

PIPING DIAGRAM

8

9

10

11

6

7

12

MIS-2749

Manual

2100-532B

Page

33 of 46

Image 33
Contents Bryan, Ohio QW2S1 QW3S1 QW4S1 QW5S1Contents Figures For More INFORMATION, Contact These Publishers Getting Other Information and PublicationsQW Model Nomenclature Electrical SpecificationsUnit Dimensions Unit Removal from Skid Shipping DamageHandling Unit After Removal from Skid Removal of Unit from SkidMinimum Installation Height GeneralProper Handling of Unit After Removal from Skid Installation of Unit Through Wall with Wall Sleeve Ducted Application Installation with Free Blow PlenumFilters Duct WorkCondensate Drain Supply Duct ConnectionsOptional Rear Drain Condensate DrainCommercial Room Ventilator Option Rear Drain TOP ViewRemoval of the Q-TEC Energy Recovery Ventilator TEC Energy Recovery Ventilator OptionInstallation Instructions Mounting the UnitRemoving Locking Screws from Wheels Unit Mounting Without Ventilation Wall Sleeve Component Location Wiring LOW Voltage Wiring Wiring Main PowerOperating Voltage Range Wall ThermostatsBlower Motor LOW Voltage Wire Harness Plug LOW Voltage ConnectionsLOW Voltage Connections for DDC Control 24VAC Remote Thermostat Wiring Diagram OptionRemote Thermostat Wiring Diagram Thermostat Option Plug #1 Start UP AdjustmentsDescription of Standard Equipment Compressor Control ModuleImportant Installer Note Optional CFM Service HintsPhase Monitor Delay on Make TimingPressure Service Ports Piping Access to UnitIndoor Blower Performance Fluid Connections on Unit with Ventilation Wall Sleeve Opening Rear of Unit Fluid Access From FloorFluid Connections on Unit Without Ventilation Wall Sleeve Flow Rate for Various Fluids Pressure TableOptional Accessories Circulation System Design Copper Water Coil ApplicationCirculation System Water Temperature and Pressure Procedure Start UP Procedure for Closed Loop SystemPerformance Model DORFC-2 Loop Pump Module Performance Model DORFC-1 Loop Pump ModulePiping Diagram Water ConnectionsConstant Flow Valves Well Pump Sizing System Start UP Procedure for Open Loop ApplicationsWater Corrosion Remedies of Water ProblemsCleaning Water Coil Lake and Pond InstallationsWater Well System Water Flow and Pressure Drop Cooling Tower / Boiler ApplicationWater Source Heat Pump Water Source Heat Pump Unbrazing System Components ServiceDon’t Troubleshooting GE ECM MotorsReplacing ECM Control Module Troubleshooting GE ECM Motors CONT’DCommon Cause Occasional Cause Denotes Ground Source Heat Pump Performance Report Following Information is Needed To Check Performance of Unit