Luvata Heatcraft Series - User Manual

Installation, Operation and Maintenance Guide
Condenser Coil Installation,
Operation and Maintenance
Guidelines for the installation, operation and maintenance of
the Heatcraft brand of refrigerant condenser coils manufactured
by Luvata in Grenada, MS have been provided to help insure
proper performance of the coils and their longevity. These are
general guidelines that may have to be tailored to meet the spe-
cifi c requirements of any one job. As always, a qualifi ed party
or technician should perform the installation and maintenance
of any coil. Protective equipment such as safety glasses, steel
toe boots and gloves are recommended during the installation
and routine maintenance of the coil.
Receiving Instructions
All Heatcraft coils are factory tested, inspected and carefully
packaged.
Damage to the coils can occur after they have left the factory.
Therefore, the coils should be inspected for shipping damage upon
receipt. The freight bill should also be checked against items
received for complete delivery. Damaged and/or missing items
should be noted on the carrier’s freight bill and signed by the driver.
For additional assistance, contact your local Luvata coil repre-
sentative.
About Luvata
Luvata is a world leader in metal solutions manufacturing and related engineering
services. Luvata’s solutions are used in industries such as renewable energy, power
generation, automotive, medicine, air-conditioning, industrial refrigeration, and
consumer products. The company’s continued success is attributed to its longev-
ity, technological excellence and strategy of building partnerships beyond metals.
Employing over 6,300 staff in 17 countries, Luvata works in partnership with
customers such as Siemens, Toyota, CERN, and Carrier.

Summary

Nomenclature and Installation

Nomenclature

Explains the coding system used for identifying condenser coil models and specifications.

Coil Types

Details the different types of Heatcraft coils available, such as CN and CF models.

Mounting

Provides essential guidance on positioning the coil for optimal counter-flow heat exchange.

Installation Steps

Covers the critical steps for installing condenser coils, including handling, connections, and leak testing.

Operation and Maintenance

Operation

Details optimal operating parameters for condenser coils, focusing on airflow and velocity.

Maintenance

Outlines recommended maintenance practices, including inspection, cleaning, and filter-dryer replacement.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Installation
5. Operation
6. Maintenance Features
7. Important Notes

This document provides an installation, operation, and maintenance guide for Heatcraft brand refrigerant condenser coils manufactured by Luvata in Grenada, MS. These guidelines aim to ensure proper performance and longevity of the coils.

Function Description

The Heatcraft condenser coils are designed for heat transfer in refrigeration systems. They facilitate the rejection of heat from the refrigerant to the surrounding air, converting the hot gas refrigerant into a liquid state. The coils are available in two main types:

• Model CN (Normal - Single Circuit): Used for applications where capacity control is not required for a single compressor circuit.
• Model CF (Face Control - Multiple Circuits): Offers a simpler form of capacity control, typically furnished with two or more hot gas connections and two or more liquid connections to provide various capacity reduction capabilities.

Important Technical Specifications

The coils are identified by a nomenclature system that includes:

• Tube O.D.: Available in 0.375", 0.500", and 0.625" diameters.
• Coil Type: Denoted by 'C' for Condenser.
• Circuiting: 'N' for Normal (Single Circuit) or 'F' for Face Control (Multiple Circuits).
• Fins Per Inch (FPI): Example given is 14 FPI.
• Rows: Example given is 06 rows.
• Fin Design: Various fin designs are available, including:
  • Flat (Aluminum, Copper)
  • Corrugated (Aluminum, Copper, Stainless Steel, Carbon Steel)
  • Sine Wave (Aluminum, Copper, Stainless Steel, Carbon Steel)
  • Raised Lance (Aluminum)
• Fin Height: Example given is 24.00 inches.
• Finned Length: Example given is 144.00 inches.

Proper coil orientation is crucial for optimal performance. The liquid header should be at the entering airside, and the hot gas header at the leaving airside, ensuring counter-flow heat exchange. The hot gas connection is at the top of the hot gas header, and the liquid connection is at the bottom of the liquid header.

Usage Features

Installation:

1. Unpacking and Inspection: Coils should be carefully removed from shipping packages to prevent damage to the finned area. Damaged fins can be straightened with a fin comb. Upon receipt, coils must be inspected for shipping damage, and the freight bill should be checked against received items. Any damage or missing items must be noted on the carrier's freight bill and signed by the driver.
2. Cleaning: Luvata recommends cleaning the coil with a commercially available coil cleaner prior to installation.
3. Clearance: Proper clearance must be maintained between the coil and other structures like fans, guards, and transition areas.
4. Brazing and Welding: All field brazing and welding should be performed using high-quality materials and an inert gas purge (e.g., nitrogen) to prevent internal oxidation and contamination.
5. Connections: Connect all fittings, valves, and bypass lines. Luvata recommends vibration suppressors between the incoming hot gas and the compressor to prevent stress cracks.
6. Leak Testing: Pressurize the coil, bypass line, and connections to 100 psig with dry nitrogen for a minimum of 10 minutes.
   • If pressure holds steady, the system is leak-free.
   • If pressure drops by 5 psi or less, repressurize and wait another 10 minutes. Further drops indicate small leaks requiring repair. Unauthorized repair may void the coil's warranty.
7. Evacuation: Use a vacuum pump to evacuate the coil and interconnecting piping to 500 microns or less. Measure vacuum as far from the pump as possible. If the vacuum holds for one minute, the system is ready for charging. A steady rise in microns indicates moisture, requiring further vacuuming.
8. Piping: All field piping must be self-supporting. Refer to the general plumbing diagram for proper connections, including liquid line filter drier, heat rejected, vibration suppression, expansion valve, evaporator, suction filter, and compressor.

Operation:

1. Air Distribution: Proper air distribution is vital, with airflow across the coil face not varying by more than 20%.
2. Air Velocities: Maintain air velocities at 400 feet per minute or above to ensure proper heat transfer.

Maintenance Features

1. Periodic Inspection: Regularly inspect the coil for signs of corrosion and leaks. Small leaks can be detected using a Halide torch. Repairs and replacements of the coil and connecting piping/valves should be performed by qualified individuals.
2. Routine Cleaning: Regular cleaning of the coil surface is essential for optimum performance.
   • Exercise caution in selecting cleaning solutions and equipment. High-pressure water can damage fins; low-pressure water is recommended.
   • Clean the coil from the leaving airside to wash foreign material out rather than pushing it further in.
   • Always read and follow manufacturer's recommendations for cleaning fluids.
3. Filter-Dryers: The use of filter-dryers in the system piping is recommended, with replacements as needed.

Important Notes:

• All installation and maintenance should be performed by a qualified party or technician.
• Protective equipment (safety glasses, steel toe boots, gloves) is recommended during installation and routine maintenance.
• Refrigerant conversions are beyond the scope of this manual and should only be performed by qualified parties.

Luvata Heatcraft Series Specifications

General

Brand	Luvata
Model	Heatcraft Series
Category	Air Conditioner
Language	English