Fan-Coil Units
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 2
to Rev 3
in Fan-Coil Units.
---
title: Fan-Coil Units
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### Design conditions shall be taken from the project basis-of-design and the unit schedule.
−### Cooling capacity shall be confirmed at the actual entering air wet-bulb temperature because sensible and latent split varies with entering humidity. {note}
+### Cooling capacity shall be confirmed at the actual entering air wet-bulb temperature because sensible and latent split varies with entering humidity.
### AHRI 440 rates cooling at 80 °F dry-bulb and 67 °F wet-bulb entering air with 45 °F entering water; capacity at other conditions shall be confirmed against the manufacturer's selection program. {note}
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### Pressure-independent control valves (PICVs) maintain the commanded coil flow regardless of differential pressure variations across the building and are preferred where differential pressure varies widely between the nearest and most remote units. {note}
−### Low close-off leakage shall be coordinated with the valve actuator selection so that a closed valve does not allow chilled water through an idle coil, which produces unwanted condensation on the cabinet and coil. {note}
+### Low close-off leakage shall be coordinated with the valve actuator selection so that a closed valve does not allow chilled water through an idle coil, which produces unwanted condensation on the cabinet and coil.
### Control valve datasheets {toc}
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### Hydronic coils serving zones with outdoor-air exposure or located in spaces subject to freezing shall be protected against coil freeze-up by a means appropriate to the installation, such as a freezestat that maintains minimum flow, fail-open heating valves, or a glycol solution where the plant permits.
−### A chilled or hot water coil exposed to subfreezing air with stagnant water will burst; freeze protection shall be confirmed for every unit with any path to freezing air before the coil is allowed to remain wet through winter. {note}
+### A chilled or hot water coil exposed to subfreezing air with stagnant water will burst; freeze protection shall be confirmed for every unit with any path to freezing air before the coil is allowed to remain wet through winter.
# Filters {toc}
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### The filter shall be accessible for replacement without removing the unit from its installed position and, for concealed units, through the ceiling access provided.
−### Filter access location shall be coordinated so that the filter can be changed from the occupied side or through an access panel and does not require entry into an adjacent tenant space. {note}
+### Filter access location shall be coordinated so that the filter can be changed from the occupied side or through an access panel and does not require entry into an adjacent tenant space.
### Filter access datasheet {toc}
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### The condensate float switch shall shut down the unit, close the cooling valve, or both on detection of a high condensate level so that the overflow is stopped before water reaches the finished space.
−### Condensate overflow onto finished construction is the single most common cause of water damage from fan-coil units and is preventable with a secondary pan and a float switch; the protection shall not be omitted on units over occupied or finished space. {note}
+### Condensate overflow onto finished construction is the single most common cause of water damage from fan-coil units and is preventable with a secondary pan and a float switch; the protection shall not be omitted on units over occupied or finished space.
### Condensate overflow protection datasheet {toc}
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### Condensate piping in the conditioned space shall be insulated where surface condensation would drip onto finished construction.
−### The condensate trap depth shall be coordinated with the unit cabinet static pressure so that the trap holds a seal and the pan drains under operating conditions. {note}
+### The condensate trap depth shall be coordinated with the unit cabinet static pressure so that the trap holds a seal and the pan drains under operating conditions.
## Ducted Connections (Concealed Units) {toc}
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### The balancing agent shall set the waterside flow through each coil to the scheduled design flow per [[sync/testing-adjusting-and-balancing]] and [[sync/hydronic-piping]].
−### Where pressure-independent control valves are used, the design flow limit shall be confirmed at the valve rather than set with a separate balancing valve. {note}
+### Where pressure-independent control valves are used, the design flow limit shall be confirmed at the valve rather than set with a separate balancing valve.
## Condensate and Functional Verification {toc}
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# Spare Parts {toc}
−## The following spare parts datasheet establishes the spares to be delivered at substantial completion. {note}
+## The following spare parts datasheet establishes the spares to be delivered at substantial completion.
```datasheet
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## The O&M manual shall include a spare-parts inventory list with manufacturer part numbers and reorder information so that additional spares can be procured during the building's service life.