Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: HVAC Condensate Drainage Piping
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## Where referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
−## The locally adopted mechanical and plumbing codes govern; the International Mechanical Code is referenced here as the predominant model code, but the adopted edition and any state amendments (for example the California Mechanical Code) shall be verified for each project. {note}
+## The locally adopted mechanical and plumbing codes govern; the International Mechanical Code is referenced here as the predominant model code, but the adopted edition and any state amendments (for example the California Mechanical Code) shall be verified for each project.
| Standard | Title |
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## The designer shall provide one of the permitted overflow protection methods on every unit where a primary drain blockage could cause water damage to the structure or its contents.
−## The Three Permitted Methods {note}
−
−## The permitted methods are: a separate secondary (overflow) drain piped from a second pan outlet to a conspicuous point of disposal, where a visible discharge warns occupants of a primary blockage; a condensate overflow safety switch, a float device that detects rising water and shuts the associated HVAC unit down before the pan overflows; or an auxiliary drain pan installed beneath the equipment with its own independent drain to a conspicuous location. The switch is the most common choice on modern equipment because it stops the source rather than merely relocating the spill, but it requires a control connection that the electrical and controls scope must carry. {note}
−
−## Where a condensate overflow safety switch is used, it shall be wired to shut down the associated HVAC unit and the shutdown shall be reflected in the equipment sequence of operations.
−
−## Where a secondary drain or auxiliary pan drain is used, it shall terminate at a conspicuous location so that discharge signals a primary-drain failure.
−
−## Coordination of the overflow safety switch shutdown wiring between the mechanical and electrical drawings is a recurring miss; the switch is only protective if the control connection is actually made. {note}
−
```datasheet
label: Overflow protection method
…6 unchanged lines
```
+## The Three Permitted Methods {note}
+
+## The permitted methods are: a separate secondary (overflow) drain piped from a second pan outlet to a conspicuous point of disposal, where a visible discharge warns occupants of a primary blockage; a condensate overflow safety switch, a float device that detects rising water and shuts the associated HVAC unit down before the pan overflows; or an auxiliary drain pan installed beneath the equipment with its own independent drain to a conspicuous location. The switch is the most common choice on modern equipment because it stops the source rather than merely relocating the spill, but it requires a control connection that the electrical and controls scope must carry. {note}
+
+## Where a condensate overflow safety switch is used, it shall be wired to shut down the associated HVAC unit and the shutdown shall be reflected in the equipment sequence of operations.
+
+## Where a secondary drain or auxiliary pan drain is used, it shall terminate at a conspicuous location so that discharge signals a primary-drain failure.
+
+## Coordination of the overflow safety switch shutdown wiring between the mechanical and electrical drawings is a recurring miss; the switch is only protective if the control connection is actually made. {note}
+
## Auxiliary Drain Pan {note}
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# Installation {toc}
−## General {note}
−
## Installation follows the routing, slope, and support rules established above, with the run kept as short and direct as the architecture allows. The drain is installed so that it can be maintained — traps, cleanouts, and pumps reachable without cutting finishes. Coordination with adjacent trades is continuous, because the condensate line shares ceilings and chases with refrigerant, hydronic, and electrical work. {note}
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# Delivery, Storage, and Handling {toc}
−## All condensate drainage materials shall be received, stored, and protected as follows: pipe, fittings, pumps, switches, and pans are delivered in the manufacturer's original packaging and stored under cover away from dirt, sunlight, and physical damage; solvent cement and primer are kept within the temperature range and shelf life printed on the container; PVC and CPVC pipe is shielded from prolonged direct sunlight to prevent ultraviolet degradation before installation. {note}
+## All condensate drainage materials shall be received, stored, and protected as follows: pipe, fittings, pumps, switches, and pans are delivered in the manufacturer's original packaging and stored under cover away from dirt, sunlight, and physical damage; solvent cement and primer are kept within the temperature range and shelf life printed on the container; PVC and CPVC pipe is shielded from prolonged direct sunlight to prevent ultraviolet degradation before installation.
# Warranty {toc}
−## Condensate pumps and manufacturer-furnished pans carry the manufacturer's standard warranty; the installation is warranted against defects in materials and workmanship for one year from substantial completion. The warranty period and any extended-warranty option are as established in the project general conditions. {note}
+## Condensate pumps and manufacturer-furnished pans carry the manufacturer's standard warranty; the installation is warranted against defects in materials and workmanship for one year from substantial completion. The warranty period and any extended-warranty option are as established in the project general conditions.
```datasheet
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# Spare Parts {toc}
−## Where condensate pumps are installed, spare float switches and a spare pump head or complete spare pump should be furnished for critical-service equipment so that a failed pump can be replaced without an extended outage. {note}
+## Where condensate pumps are installed, spare float switches and a spare pump head or complete spare pump should be furnished for critical-service equipment so that a failed pump can be replaced without an extended outage.
```datasheet
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- Drain-line treatment tablets / strips (one year supply)
```