YORK YVAA Air-Cooled Screw Liquid Chillers Installation Operation & Maintenance Manual 201.28-NM1.1

Description

YORK YVAA Air-Cooled Screw Liquid Chillers Installation, Operation & Maintenance Manual

This is the complete Installation, Operation and Maintenance (IOM) manual for the YORK YVAA Style A Air-Cooled Screw Liquid Chillers with Variable Speed Drive, covering frame sizes 015 through 052 (150 ton to 500 ton / 525 kW to 1,750 kW), 2-compressor, 50 Hz units using R-134a or R-513A refrigerant. Issued as Form 201.28-NM1.1.EN.GB dated 10/20/2023, this 184-page document is the single reference needed for rigging, installing, commissioning, operating, and maintaining YVAA chillers in the field.

File Details

• Manual type: Installation, Operation and Maintenance (IOM) manual
• Brand: YORK (Johnson Controls)
• Model: YVAA Style A Air-Cooled Screw Liquid Chiller with Variable Speed Drive
• Frame sizes covered: 015 to 052
• Capacity range: 150 ton to 500 ton / 525 kW to 1,750 kW
• Refrigerants: R-134a or R-513A
• Language: English
• Page count: 184
• File format: PDF
• Document number: 201.28-NM1.1.EN.GB
• Issue date: 10/20/2023

Chapters Covered

• Section 1: General chiller information and safety — safety symbols, fluorinated greenhouse gases, responsibility for safety, misuse of equipment, pressure systems, electrical, rotating parts, refrigerant and oil handling, generator operation, emergency shutdown, safety labels
• Section 2: Product description — general system description, semi-hermetic YORK twin-screw compressors, evaporator, condenser, refrigerant circuit, electrical, building automation system capabilities, microcomputer control center, accessories and options, fan options, condenser coils, evaporator options, controls options, vibration isolation
• Section 3: Rigging, handling, and storage — lifting weights, delivery and storage, inspection, moving the chiller, unit removal from shipping container, lifting using lugs, lifting using shackles, unit rigging tables
• Section 4: Installation — location requirements, outdoor installations, location clearances, vibration isolators, shipping braces, chilled liquid piping, evaporator pressure drop, water treatment, pipework arrangement, minimum water volume, leaving water temperature out of range, thermal storage, variable primary flow, connection types and sizes, evaporator connections, refrigerant relief valve piping, electrical connection, power wiring, 115 VAC control supply transformer, control wiring, volts free contacts, system inputs, power supply wiring, customer control wiring, thermal dispersion flow switch connections, field assembly procedure for YVAA split units
• Section 5: Technical data — physical data tables, one-pass / two-pass / three-pass evaporator dimensions, isolator selection and mounting locations, elastomeric and spring isolator specifications, YVAA dimensions
• Section 6: Commissioning — preparation, inspection, refrigerant charge, service and oil line valves, compressor oil, fans, isolation and protection, control panel, power connections, grounding, water system, flow switch, thermal dispersion flow switch setup, temperature sensors, programmed options, programmed settings, date and time, start/stop schedule, setpoint and remote offset, first time start up, general operation, freeze damage protection
• Section 7: Operation — operating controls, unit switch, keypad, display, anti-recycle timer, evaporator pump control, evaporator heater control, compressor heater control, alarms, chiller run contact, flow switch control, remote run/stop, basic operating sequence, unit warning, microboard 331-03478-xxx, BAS communications, E-Link or SC-EQ interface, program update, data logging, unit safeties, system safeties (faults)
• Section 8: Micropanel — status key operation, unit data key, system data keys 1 through 4, VSD data key, operating hours / start counter key, history key, setpoints key, program key, options key, date/time and schedule keys, manual override key, print key, system switches key
• Section 9: Maintenance — general requirements, weekly maintenance, checking system for leaks, system pressure test, soap visual gas leak test, trace gas leak test, system evacuation, vacuum dehydration, dehydration, refrigerant charging, removing the refrigerant charge for service, checking and trimming the refrigerant charge, draining the glycol liquid, microchannel coil cleaning, chilled liquid system maintenance, maintenance requirements for YVAA chillers, R-134a and R-513A conversion tables, temperature sensor input voltage tables, pressure transducer output voltage table, motor temperature sensor resistance table
• Section 10: Decommissioning, dismantling, and disposal — general dismantling procedure, refrigerant recovery, glycol disposal, lifting considerations, SI metric conversion table

Altogether this IOM manual gives a technician the full lifecycle reference for the YVAA chiller platform. Rigging and lifting guidance, minimum clearances and evaporator tube removal dimensions, vibration isolator selection tables, chilled water piping arrangements, refrigerant relief valve sizing formula, single and dual point power wiring diagrams, thermal dispersion flow switch wiring, and the field assembly procedure for split units are all documented in Section 4 alone. Sections 6 and 7 walk through first-time start-up, interlocks, oil pressure checks, fan rotation, refrigerant charge verification, unit warnings, and the full safety-fault matrix. Section 8 is a complete micropanel reference, from the STATUS key through the SYSTEM SWITCHES key. Section 9 is the maintenance backbone: leak testing hold times, evacuation targets, vacuum dehydration with a saturation curve, refrigerant charge trimming using evaporator approach, subcooling, and discharge superheat, plus microchannel coil cleaning procedures for standard and Environment Guard Premium coils. Conversion tables for R-134a and R-513A pressure to saturated temperature are included, as are temperature sensor input voltage charts, pressure transducer output voltages, and motor temperature sensor resistance values.

Who this YORK YVAA manual is for

Rigging crews, installation contractors, commissioning engineers, and in-house service technicians working on YVAA Style A air-cooled screw chillers. Frame sizes 015 to 052 span the whole tonnage range covered in this document, so the same manual serves buildings running a single mid-size chiller or a plant with several large units. Anyone responsible for setting up evaporator piping, wiring the flow switch, programming the micropanel, or interpreting a fault code will find the relevant procedure indexed in the table of contents.

What this manual enables you to do

• Rig, lift, and place YVAA chillers using the factory lifting lug and shackle procedures, with rigging hole location tables for every covered frame size.
• Install chilled liquid piping correctly, including strainer placement, flow switch positioning, bypass arrangements for low and high flow applications, and relief valve piping sizing.
• Wire single point or dual point power supplies and route customer control wiring through the correct 1TB terminals.
• Commission the chiller: verify refrigerant charge, set thermal dispersion flow switch, configure micropanel options, and run the first-time start-up sequence.
• Operate the microcomputer control center — program setpoints, review history buffers, enable data logging to an SD card, and use the service keypad.
• Diagnose and clear unit and system faults, including high discharge pressure, low suction pressure, high motor temperature, sensor failures, VSD communications failures, and eductor clogs.
• Perform routine and major maintenance: leak testing, pressure hold tests, evacuation and dehydration, refrigerant charge trimming, glycol draining, and microchannel coil cleaning.
• Decommission the chiller safely with proper refrigerant recovery and glycol disposal procedures.

Why having the correct procedures matters

A screw chiller of this size is a high-value asset. The wrong refrigerant charge, an improperly seated flow switch, or a missed compressor heater check can lead to evaporator freeze-up, compressor damage, or voided warranty coverage. This manual spells out the specific values — the 5,000 micron vacuum hold test, the 150 micron per hour acceptable rise, the 22.4 barg high discharge pressure cutout, the R-134a and R-513A saturated temperature tables — so that service decisions are made on data rather than guesswork. The safety section covers refrigerant handling, high voltage in the VSD cabinet, DC bus bleed-down time, and hot surfaces on the IL line inductor, all of which apply every time a technician opens a panel.

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Instant PDF delivery

The YORK YVAA Installation, Operation & Maintenance Manual 201.28-NM1.1 is delivered as an instant PDF download after purchase. No shipping, no waiting for a physical binder. Open it on a laptop, tablet, or phone at the chiller, print the pages you need for the job site, and keep the full document on file for the life of the equipment.