Chillers
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 7
to Rev 8
in Chillers.
---
title: Chillers
…778 unchanged lines
### A subcooler section at the condenser outlet increases refrigerant liquid subcooling, improves cycle efficiency, and is standard on most centrifugal and screw chillers. {note}
+### Marine waterboxes are strongly recommended for water-cooled condensers because open-loop condenser water service produces scale and biofilm on tube interiors that must be brushed out periodically.
+
```datasheet
label: Condenser Water-Side Provisions
…8 unchanged lines
default: "Marine waterbox (removable cover for tube cleaning)"
```
−
−### Marine waterboxes are strongly recommended for water-cooled condensers because open-loop condenser water service produces scale and biofilm on tube interiors that must be brushed out periodically.
### Automatic tube brush cleaning systems circulate small brushes through the condenser tubes continuously and substantially reduce manual cleaning labor; they are common on large central plants in continuous service. {note}
…17 unchanged lines
### E-coated coils provide additional corrosion protection for coastal, urban, and industrial environments where airborne chlorides, sulfides, or particulates would otherwise degrade the standard fin material. {note}
+### The condenser fan type shall be specified consistent with the sound, energy, and head-pressure control requirements of the installation.
+
```datasheet
label: Condenser Fan Type
…55 unchanged lines
### VFDs eliminate the inrush problem entirely (VFD starting current is essentially full-load), provide variable-speed compressor operation for part-load efficiency, and are the standard starter type for new chillers above approximately 75 tons. {note}
+### Factory-mounted and factory-wired integral starters and VFDs eliminate field power wiring between the starter and the compressor and avoid the cable length and filtering issues associated with remote-mounted VFDs. {note}
+### Remote starters are appropriate where machinery room thermal load must be minimized, where the starter or VFD requires its own cooled enclosure, or where service access to the starter is poor at the chiller location.
+
```datasheet
label: Starter Location
…7 unchanged lines
```
−### Factory-mounted and factory-wired integral starters and VFDs eliminate field power wiring between the starter and the compressor and avoid the cable length and filtering issues associated with remote-mounted VFDs. {note}
−### Remote starters are appropriate where machinery room thermal load must be minimized, where the starter or VFD requires its own cooled enclosure, or where service access to the starter is poor at the chiller location.
−
### The starter and motor selection shall be coordinated with the electrical engineer for short-circuit current rating (SCCR), maximum inrush, and harmonic compatibility with the building service.
…368 unchanged lines
## The Owner is responsible for ongoing refrigerant management under 40 CFR Part 82. {note}
+## The Contractor shall document the refrigerant type, total system charge weight, and date of charge on the chiller's nameplate and in the closeout submittals.
+
+## The Contractor shall ensure that any field refrigerant addition is performed only by EPA Section 608 certified technicians.
+
+## The Contractor shall provide refrigerant recovery during any major service that opens the refrigerant circuit; venting of refrigerant to atmosphere is prohibited under EPA rules and constitutes a federal violation.
+
+## The Contractor shall provide the Owner with the refrigerant management documentation, the recommended leak inspection interval, and the manufacturer's leak rate threshold for triggering corrective action.
+
```datasheet
label: Refrigerant Management Documentation
…8 unchanged lines
```
−## The Contractor shall document the refrigerant type, total system charge weight, and date of charge on the chiller's nameplate and in the closeout submittals.
−
−## The Contractor shall ensure that any field refrigerant addition is performed only by EPA Section 608 certified technicians.
−
−## The Contractor shall provide refrigerant recovery during any major service that opens the refrigerant circuit; venting of refrigerant to atmosphere is prohibited under EPA rules and constitutes a federal violation.
−
−## The Contractor shall provide the Owner with the refrigerant management documentation, the recommended leak inspection interval, and the manufacturer's leak rate threshold for triggering corrective action.
−
# Delivery, Storage, and Handling {toc}
…84 unchanged lines
## A spare control board is justified only for critical installations because the boards are expensive and prone to fail individually rather than predictably across a fleet. {note}
+## The maintenance tools and documentation to be furnished with the chiller at substantial completion shall be specified from those available for the installation.
+
```datasheet
label: Maintenance Tools and Documentation
…9 unchanged lines
default: "Manufacturer's installation, operation, and maintenance manual"
```