---
title: HVAC Water Treatment
−category: Mechanical
+category: Mechanical / Piping & Pumps
toc_depth: 3
description: >
…1110 unchanged lines
The treatment program established by this standard depends on the physical systems built per [[sync/hydronic-piping]] and [[sync/hvac-pumps]]. The cleanliness of the system at start-up determines whether the chemistry can establish effective control; the velocity profile of the system determines whether side-stream filtration reaches all zones; the placement of sample ports and chemical-feed connections affects whether the program can be operated and monitored without disassembly. The Engineer shall coordinate the treatment design with the piping and pump design early — at the schematic phase — so that sample-port and feed-connection locations are integrated with the piping layout rather than added afterward as field modifications. The cooling coils in [[sync/air-handling-units]] are direct beneficiaries of the chilled water treatment program, and the chemistry shall be confirmed compatible with the coil construction (copper tube, aluminum fin where present, gasketed or brazed headers). The chemical-feed controllers and the BAS integration described here interface with the building automation system per [[sync/building-automation-system]]; the controller's communication protocol, point list, alarm priority, and trend logging configuration are agreed at the BAS submittal stage.