10
Multiple Heat Pump Connections
All plumbing on multiple heat pump installations must be done in parallel see Figures 9 and 10. An equal flow of water to each heat pump is important for optimum operation.
NOTE: It may be necessary to adjust water pressure switch if a unit is installed below the water level. See page 20 for details on when and how to adjust the pressure switch.
Each heat pump allows a maximum flow rate of 125 gpm and requires a minimum of 30 gpm.
24 inches min. clearance around evap.
24"
2" PVC Pipe
Extend12" past end heater inlet for hydraulic balancing
Flow Meter | OPTIONAL |
2" Check Valve Bypass |
To Pool
Figure 9. Two Heat Pump Plumbing Layout
24 inches min. clearance around evap.
24"
Check Valves are optional on heater inlets but will help system balancing
Extend12" past end heater inlet for hydraulic balancing
Flow Meter
Pool Pump
Minimum
2" PVC Pipe
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| 2" PVC | 2" PVC | 2" PVC |
| 2" PVC Pipe | Pipe | Pipe | Pipe |
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Extend12" past | 3" PVC Pipe |
| 3" PVC Pipe |
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end heater inlet |
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for hydraulic |
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balancing |
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| Flow Meter | 3" Ball Valve Bypass |
| Flow Meter |
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Check Valves are optional on heater inlets but will help for system balancing
Extend12" past end heater inlet for hydraulic balancing
To Pool
Pool Pump
Minimum
3" PVC Pipe
Figure 10. Four Heat Pump Plumbing Layout
ThermalFlo Installation and User’s Guide