HVAC Pumps
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 6
to Rev 7
in HVAC Pumps.
---
title: HVAC Pumps
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### The hydraulic and mechanical requirements differ significantly among HVAC services because of differences in operating temperature, water chemistry, and the consequences of failure. {note}
+### The service for each pump shall be specified so its hydraulic and mechanical requirements match the operating temperature, water chemistry, and consequences of failure for that service.
+
```datasheet
label: Pump Service
…86 unchanged lines
### The pump configuration is selected based on flow, head, available space, redundancy requirements, and the suction approach. {note}
+### The pump configuration shall be specified for each pump based on its required flow, head, available space, redundancy, and suction approach.
+
```datasheet
label: Pump Configuration
…18 unchanged lines
### Typical arrangements include lead-lag pairs (one duty, one standby), parallel duty-and-standby (two pumps at 100% capacity each, alternating duty), parallel pairs (two pumps at 50% capacity each, both running at design load), and variable-speed sets of three or more pumps for variable-flow distribution systems. {note}
+### Pump count and redundancy arrangement shall be [[drawing: as indicated on the mechanical equipment schedules and piping diagrams]].
+
```datasheet
label: Pump Arrangement
…10 unchanged lines
```
−### Pump count and redundancy arrangement shall be [[drawing: as indicated on the mechanical equipment schedules and piping diagrams]].
−
# Performance Requirements {toc}
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### The pump manufacturer's published minimum submergence requirement shall be confirmed against the actual cooling tower sump water level at the design flow.
−### Inadequate submergence causes air-entraining vortices that destroy pump performance and damage the impeller; in many cases a vortex breaker plate or flow-conditioning intake structure must be added to allow the published submergence. {note}
+### Inadequate submergence causes air-entraining vortices that destroy pump performance and damage the impeller; in many cases a vortex breaker plate or flow-conditioning intake structure must be added to allow the published submergence.
## Open-Loop System Legionella Risk Management {toc}
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default: "Manufacturer's installation, operation, and maintenance manual per ANSI/HI 1.4"
```