York RecipPak YEAZ88DR6 User Manual (English)

Questions and Answers:

Q
qrodriguezAug 16, 2025
Why is my York Chiller showing a 'Low Suction' fault?
- P
  Paul RussellAug 16, 2025
  If your York Chiller is showing a 'Low Suction' fault, adjust per recommended settings and restart the unit. The fault may be caused by improper suction pressure cut-out adjustment, low refrigerant charge, a fouled filter drier, thermal expansion valve adjustment/failure, reduced chilled liquid flow, a defective suction pressure transducer, a fouled compressor suction strainer, or faulty wiring to the transducer.
J
Jill CarterAug 19, 2025
Why does my York RecipPak YEAZ88DR6 Chiller show a 'High Dsch' fault?
- K
  Kevin CookSep 12, 2025
  If your York Chiller cuts out due to high discharge pressure, check the condenser fans, fuses, and contactors. The causes can be in condenser fans not operating or rotating backwards, too much refrigerant, air in the refrigerant system, defective discharge pressure transducer, incorrect Programmable H.P. Cut-out setting, or incorrect OAT sensor reading.
K
Kimberly TylerAug 22, 2025
What to do if my York Chiller displays a 'Low Oil Press' fault?
- M
  Matthew BrownAug 22, 2025
  If you're seeing a 'Low Oil Press' fault on your York Chiller, the oil level should be visible in the sight glass at all times. Add YORK ?C? oil if necessary. The cause may be low oil charge, too much refrigerant in the oil (particularly on start-up), Liquid Line Solenoid Valve (LLSV) not operating, or defective Suction/Oil Pressure Transducer or wiring.
T
Timothy WilliamsAug 25, 2025
How to troubleshoot a York RecipPak YEAZ88DR6 with no display on the panel?
- M
  Matthew CarpenterAug 26, 2025
  If there is no display on the panel and the York Chiller unit will not operate, check the wiring and fuses (1 FU and 2 FU), and emergency stop contacts 5 to 1. Also, check the wiring from 2T to the Power Supply Board. If these steps don't resolve the issue, replace 2T or the Power Supply Board, or isolate any excessive load on the board. The cause may be no 115VAC to 2T, no 24VAC to the Power Supply Board, a defective 2T with no 24VAC output, or no +12V output from the Power Supply Board.
B
benitezkathrynAug 28, 2025
What does '?NO RUN PERM?' mean on my York Chiller and how do I fix it?
- T
  Tracy TurnerAug 28, 2025
  If your York Chiller displays a '?NO RUN PERM?' message, check the chilled liquid flow and ensure the flow switch is installed according to the manufacturer's instructions. Replace the flow switch if defective. Also, check any cycling devices connected to terminals 13 & 14 of the TB3 Terminal Block, and ensure the 'System' switch is in the ON position. The issue may be due to no flow, an improperly installed or defective flow switch, a remote cycling device being open, or the 'System' switch being in the OFF position. Place switches to the ON position.
V
vparksAug 31, 2025
What causes a 'High Ambient Temp' fault on my York RecipPak YEAZ88DR6 Chiller?
- C
  Christopher RussellAug 31, 2025
  If your York Chiller displays a 'High Ambient Temp' fault, verify the actual ambient temperature at the probe is within +10°F of a thermometer placed next to the OAT sensor. The fault may be caused by the temperature being sensed incorrectly by the thermistor, fans rotating backwards, restricted or re-circulated airflow to the unit, or a high ambient cut-out set too low.
S
Stephanie MontgomerySep 3, 2025
How to resolve low compressor oil level on York RecipPak YEAZ88DR6?
- H
  harriscatherineSep 3, 2025
  If you observe a low compressor oil level, especially during start-up of your York Chiller, ensure the oil level is visible in the sight glass at all times and add YORK 'C' oil if necessary. This issue can be caused by a low oil charge or excessive flood back of liquid refrigerant.
S
Steven RogersSep 6, 2025
What to do if my York RecipPak YEAZ88DR6 Chiller shows a 'Low Water Temp' fault?
- P
  Paul MccormickSep 6, 2025
  If your York Chiller experiences a low water temperature shutdown, and you have RWT Control ONLY, increase flow or increase the control range to match actual evaporator temperature difference. Also check the LWT cut-out point on the panel. The issue may be due to the control range being too small, the LWT cut-out point on panel, or a defective LWT or RWT sensor.
R
Russell MendezSep 8, 2025
Why won't the compressor load on my York RecipPak YEAZ88DR6 Chiller?
- C
  Carol ColeSep 9, 2025
  If the compressor on your York Chiller won't load, check the operating limitations for excessive load. The causes may be suction pressure greater than the programmed unload point, discharge pressure greater than the programmed load point, insufficient demand, a defective loading solenoid, faulty wiring to the loading solenoid, a defective water temperature sensor, or a defective evaporator/optional discharge transducer.
T
Traci FergusonSep 12, 2025
What does it mean when my York RecipPak YEAZ88DR6 Chiller shows a 'Low Ambient Temp' fault?
- M
  Maria MartinezSep 12, 2025
  If your York Chiller displays a 'Low Ambient Temp' fault, no problem exists. The cause can be the temperature of outside air being below the cutout setting, the temperature being sensed incorrectly by the thermistor, or the low ambient temperature Cut-out setting on the display.

York RecipPak YEAZ88DR6 Specifications

General

Model	YEAZ88DR6
Category	Chiller
Cooling Capacity	88 Tons
Refrigerant Type	R-134a
Compressor Type	Reciprocating
Voltage	460 V
Phase	3
Width	48 in
Length	142 in
Height	72 in

Summary

General Information

Unit Nomenclature

Explains how to interpret the unit model number and its components.

Code Status

Details compliance with industry standards and codes for unit design.

Compressor Nomenclature

Z Models

Describes the nomenclature specific to Z series compressors, detailing their model structure.

J Models

Describes the nomenclature specific to J series compressors, detailing their model structure.

Operational Limitations

Voltage Limitations

Specifies the absolute and operational voltage limits for safe compressor operation.

Temperatures and Flows

Provides minimum and maximum temperature and flow rate data for various chiller models.

Dimensions

Weight Distributions (LBS.)

Details the approximate operating weight distribution in pounds for different unit models.

Physical Data

Electrical Data

Installation

Installation Check List

Lists essential checks required before placing units into operation for proper installation.

Location and Clearances

Specifies requirements for selecting an installation location and maintaining necessary clearances.

Foundation

Details requirements for a stable and level foundation to support the unit's operating weight.

Installation Site Preparation

Ground Level Locations

Recommendations for installing units on ground level foundations.

Rooftop Locations

Guidelines for selecting and preparing rooftop locations for chiller installation.

Shipping Braces

Instructions for removing shipping brackets to ensure proper unit mounting.

Spring Isolators (Optional)

Details the installation procedure for optional spring isolators to minimize vibration.

Installation Mounting and Piping

Compressor Mounting

Explains how compressors are mounted on isolator pads and the importance of not loosening bolts.

Chilled Liquid Piping

Provides general guidelines and considerations for connecting the chilled liquid piping system.

Wiring Diagrams

Connection Diagram, Electrical Box

Condenser Fans

Illustrates the wiring connections for the condenser fans.

Cooler

Shows the wiring connections for the cooler components.

Compressors

Details the wiring connections for the compressor systems.

Unit Controls and Operation

Introduction

Provides an overview of the microprocessor control system for maintaining chilled liquid temperature.

Microprocessor Board

Describes the function of the microprocessor as the central controller and decision maker.

System Components Overview

Describes key components like Power Supply, CT, Display, Keypad, and Battery Back-up.

"Display" Keys

General

Explains how DISPLAY keys retrieve system operating data for monitoring and diagnostics.

Temperature Displays

Covers displays for chilled liquid temperatures and ambient temperature readings.

Pressure Displays

Explains displays for System 1 and System 2 pressures, including oil, suction, and discharge.

Operational Status Displays

Covers displays for motor current, operating hours, start counts, and selected options.

Switch Settings

Switch 1

Configures comfort cooling or brine/process duty, affecting temperature setpoint range.

Switch 4

Selects between return water control or leaving water control for chiller operation.

Switch 2

Sets the low ambient cut-out behavior, standard or programmable.

Switch 5

Determines whether display messages are shown in English or Metric units.

Switch Settings Continued

Switch 3

Configures local control mode or remote control mode for system operation.

Switch 6

Sets standard condenser fan control or shared condenser fan control.

Switch 7

Selects between manual lead/lag or automatic lead/lag compressor operation.

Switch 8

Configures fan control based on ambient/discharge pressure or discharge pressure only.

"Status" Key

General

Explains how the STATUS key retrieves current chiller operating status and fault information.

General Status Message

Discusses various general status messages displayed by the micro.

Unit Switch is in the Off Position

A specific status message indicating the main unit switch is off.

Daily Schedule Shutdown

Indicates that the programmed schedule is preventing chiller operation.

"Status" Key Continued

Manual Override

Describes the function of the manual override key for emergency or service operations.

Fault Status Messages

Explains that fault messages indicate safety thresholds have been exceeded, leading to shutdown.

Fault Status Messages Continued

Chiller Faults

Lists specific fault conditions that can cause a complete chiller shutdown.

System Faults

Lists faults specific to one system that cause only that system to shut down.

"Entry" Keys

General

Explains how the ENTRY key is used to change programmed numerical values like setpoints.

Numerical Keypad

Describes the keypad used for entering numerical values and programming.

Enter Key

Details the function of the ENTER key to accept new values and advance through menus.

Cancel Key

Explains how the CANCEL key is used to correct errors during data entry.

AM/PM Key

Used for changing AM/PM designation when setting time or schedules.

Advance Day Key

Used for advancing the day when programming the system clock or schedule.

"Program" Key

Programming User Programmable Safeties and Limits

Guides the user on programming system operating limits, safeties, and timers.

Discharge Cut-Out

Explains how to program the discharge cut-out, a backup for mechanical high pressure cut-out.

Ambient Temperature Limits

Details programming high and low ambient temperature cut-out points for chillers.

Pressure Control Programming

Guides programming discharge pressure unload and suction pressure unload points.

"Program" Key - Control Parameters

Rate Control and Anti-Recycle Settings

Guides programming rate control temperature, sensitivity, and anti-recycle time for compressor protection.

Temperature and Load Step Settings

Details programming leaving water temperature cut-out and the number of load steps.

"Clock" Keys

Programming the System Clock and Daily Start/Stop Schedule

Guides programming the internal clock, daily schedules, and holiday settings.

Set Time

Explains how to set the current day, time, and date for the chiller's internal clock.

"Clock" Keys Continued

Programming the Daily Start/Stop and Holiday Schedule

Details how to program daily start/stop times and designate holidays for automated operation.

Manual Override

Describes the function of the manual override key to ignore the programmed schedule.

Selection of Return or Leaving Chilled Liquid Control

General

Explains the user's ability to select between Return or Leaving temperature control methods.

RWT Control: SW 4 Open

Specifies the dip switch setting for Return Water Temperature control.

LWT Control: SW 4 Closed

Specifies the dip switch setting for Leaving Water Temperature control.

"Setpoints" Keys

Programming Chilled Liquid Setpoints and Remote Reset Temp Range

Guides programming chilled liquid setpoints and remote reset temperature ranges.

Programming Return Water Control

Details programming setpoints and control ranges for return water control.

"Setpoints" Keys - Control Procedures

Programming Return Water Rate Control

Guides programming rate control parameters for return water to manage cycling.

Programming Leaving Water Control

Details programming setpoints and control ranges for leaving water control.

Programming Leaving Water Rate Control

Guides programming rate control for leaving water to manage cycling.

"System Safeties"

Manual Reset Safeties

Explains safeties that shut down a system until manually reset after a threshold is exceeded.

Pressure and Component Safeties

Covers oil, discharge pressure, pumpdown, motor protector, and HPCO safeties for system protection.

Automatic Reset and Environmental Safeties

Details automatic reset safeties, low/high ambient, low water temp, under voltage, and flow switch safety.

Timer and Control Safeties

Explains power failure, anticipation controls, suction/discharge unloading, and anti-recycle timers.

"Print" Keys

General

Explains how PRINT keys obtain real-time data or fault history printouts.

Remote Printout

Guides obtaining printouts of system data or fault history using a remote printer.

Oper Data

Explains how to obtain a printout of current system operating parameters.

History

Guides obtaining printouts of information related to the last 3 safety shutdowns.

Local Display Readout

Oper Data and System Timers

Accesses and displays operating data, system run times, load, and unload timer information.

Operational Status Displays

Shows temperature demand, pump status, and system lead/control type information.

Fault History and System Parameters

Provides access to fault history and displays system parameters like cooling range.

"Unit" On / Off Switch

Unit On/Off Switch

Describes the master switch to turn the entire chiller ON or OFF.

System Switches

Explains how to selectively turn individual systems (compressors) ON or OFF.

Alarm Contacts (Annunciation Alarm)

Details dry contacts for warning of faults or power loss, triggering external alarms.

Lead/Lag Compressor Selection

Explains how to set up automatic or manual lead/lag compressor operation.

Memory Battery Back-Up

Details the function of the RTC chip's battery backup for retaining data during power failures.

Clock Jumper

Explains the jumper's role in controlling the Real Time Clock and its impact on timekeeping.

Crankcase Heater

Explains the purpose of the crankcase heater to prevent refrigerant migration during shutdown.

Evaporator Heater

Describes the function of the evaporator heater to prevent freezing in low ambient temperatures.

Metric Display

Explains how to set the control panel to display readings in metric units.

EMS/BAS Controls

Covers remote start/stop, unloading, and setpoint reset capabilities via external contacts.

Compressor Capacity Control

60 Hz

Lists compressor models, types, cylinder counts, and unloading steps for 60 Hz units.

50 Hz

Lists compressor models, types, cylinder counts, and unloading steps for 50 Hz units.

Compressor Capacity Control - Loading/Unloading

“Z” Compressor (Style B) Loading/Unloading

Explains the loading/unloading mechanism for Z compressor style.

"J" Compressor (Style G) Loading/Unloading

Explains the loading/unloading mechanism for J compressor style.

System Start-Up Checklist

Checking the System 24 Hours Prior to Initial Start-Up (No Power)

Lists pre-start checks for unit and piping before applying power.

Panel Checks (Power On-Both System Switches "Off")

Outlines checks to perform on the control panel after applying power with systems off.

System Start-Up Checklist - Initial Start-Up

Initial Start-Up

Guides the initial startup procedure after all preceding checks and programming are complete.

Checking Superheat and Subcooling

Example:

Provides an example calculation for subcooling based on pressure and temperature readings.

Record:

Provides fields to record suction temperature, pressure, and superheat measurements.

NOTES:

Includes notes on leak checks, fitting integrity, and the satisfactory operation of the unit.

Operating Sequence

Preventative Maintenance

IMPORTANT

Contains a disclaimer regarding warranty and maintenance responsibilities.

Daily Maintenance

Recommends daily checks for oil level, oil pressure, superheat, and operating parameters.

Weekly Maintenance

Recommends weekly checks including oil color and refrigerant circuit for leaks.

Annual Maintenance

Outlines recommended annual checks for controls, compressor oil, and valves.

Options

Control and Interfacing Options

Covers Condenser/Evaporator Pump, BAS Interface, and Low Ambient options.

Performance Monitoring and Control Options

Covers Discharge Pressure Readout and Hot Gas Bypass options for performance tuning.

Physical Protection Options

Covers various tamperproof enclosure options for physical security and aesthetics.

Fan Control Strategy

Ambient and Pressure Fan Control 25° - 45°F

Describes fan control strategy based on discharge pressure and ambient temperature between 25°F and 45°F.

Ambient and Pressure Fan Control 45°F and Higher

Details fan control strategy strictly based on temperature for ambients above 45°F.

Pressure Control Only, Fan Control by Discharge Pressure

Explains fan control strategy solely based on discharge pressure, ignoring ambient temperature.

Hot Gas Bypass (Loadminder) Option

General

Explains the purpose of the Hot Gas Bypass option to prevent cycling and reduce temperature fluctuation.

LWT Control Hot Gas Operation

Details how the hot gas solenoid is activated by the microprocessor in Leaving Water Control.

RWT Control Hot Gas Operation

Explains how the hot gas solenoid is activated in Return Water Control based on temperature and pressure.

Hot Gas Bypass (Loadminder) Option - Field Installation

Field Installation

Provides instructions and part numbers for field installation of the Hot Gas Bypass Option.

Discharge Pressure Readout Option

Allows obtaining discharge pressure displays and enables related features like fan control.

High Ambient Option

Allows chiller operation in higher ambients up to 115°F by managing discharge pressure and fan control.

Local Printer Option

Explains the capability of supplying chiller condition or fault shutdown printouts.

Weigh-Tronix IMP-24 Model 2600 Printer

Recommends a specific compact printer for service work and data logging.

Local Printer Option - Assembly and Wiring

Installation Limitations

Lists limitations for printer installation, including cable length and power source.

Parts

Lists the required parts for installing the printer option.

Assembly and Wiring

Provides instructions for assembling and wiring the printer components.

Printer Configuration

Details the required switch settings on the printer for proper configuration.

Optional Tamperproof Enclosure (Wire Grille)

General

Describes the wire grille enclosure for deterring unauthorized access to chiller components.

Installation

Provides instructions for installing the tamperproof enclosure and its associated parts.

Optional Decorative Tamperproof Enclosure (Louvered & Wire Grille)

General

Describes a decorative enclosure with louvered panels and wire grilles for aesthetics and access deterrence.

Installation

Provides instructions for installing the louvered and wire grille enclosure.

Optional Decorative Tamperproof Enclosure (Louvered)

General

Describes a decorative enclosure made entirely of louvered sheet metal panels.

Installation

Provides instructions for installing the louvered enclosure panels.

BAS Interface Option (Remote Reset Option)

0-10VDC

Details wiring and programming for using a 0-10VDC signal for remote temperature setpoint offset.

4-20mA

Explains wiring and programming for using a 4-20mA signal for remote temperature setpoint offset.

Dry Contact

Describes using a dry contact and potentiometer for a fixed offset of temperature setpoint.

Troubleshooting Chart

"No display on panel Unit will not operate"

Provides causes and solutions for the unit not displaying or operating.

"No Run Perm"

Addresses causes and solutions when the 'No Run Permissive' status is displayed.

"Motor Current" Fault

Covers causes and solutions when the motor contactor does not energize or the fault occurs.

"Low Oil Press" Fault

Details causes and solutions for low oil pressure faults.

Troubleshooting Chart - Pressure and Temperature Faults

"Low Suction" Fault

Addresses causes and solutions for low suction pressure faults.

"High Dsch" Fault

Covers causes and solutions for high discharge pressure faults detected by the microprocessor.

"Chiller Fault: High Ambient Temp"

Discusses causes and solutions for chiller shutdown due to high ambient temperatures.

"Chiller Fault: Low Ambient Temp"

Addresses causes and solutions for chiller shutdown due to low ambient temperatures.

Troubleshooting Chart - Water and Component Faults

"Chiller Fault: Low Water Temp"

Discusses causes and solutions for chiller shutdown due to low water temperature.

Low Compressor Oil Level (Particularly on start-up)

Addresses causes and solutions for low compressor oil level issues, especially on startup.

Crankcase Heater won't Energize

Covers causes and solutions for the crankcase heater not energizing when the unit is off.

Troubleshooting Chart - Load and Cooling Effect

Compressor won't load (Solenoid valve de-energizes to load compressor)

Addresses causes and solutions when the compressor fails to load, likely due to solenoid issues.

Lack of Cooling Effect

Covers potential causes and solutions for a general lack of cooling effect from the chiller.

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York RecipPak YEAZ88DR6 User Manual

Table of Contents

Questions and Answers:

York RecipPak YEAZ88DR6 Specifications

Summary

General Information

Unit Nomenclature

Code Status

Compressor Nomenclature

Z Models

J Models

Operational Limitations

Voltage Limitations

Temperatures and Flows

Dimensions

Weight Distributions (LBS.)

Physical Data

Electrical Data

Installation

Installation Check List

Location and Clearances

Foundation

Installation Site Preparation

Ground Level Locations

Rooftop Locations

Shipping Braces

Spring Isolators (Optional)

Installation Mounting and Piping

Compressor Mounting

Chilled Liquid Piping

Wiring Diagrams

Connection Diagram, Electrical Box

Condenser Fans

Cooler

Compressors

Unit Controls and Operation

Introduction

Microprocessor Board

System Components Overview

"Display" Keys

General

Temperature Displays

Pressure Displays

Operational Status Displays

Switch Settings

Switch 1

Switch 4

Switch 2

Switch 5

Switch Settings Continued

Switch 3

Switch 6

Switch 7

Switch 8

"Status" Key

General

General Status Message

Unit Switch is in the Off Position

Daily Schedule Shutdown

"Status" Key Continued

Manual Override

Fault Status Messages

Fault Status Messages Continued

Chiller Faults

System Faults

"Entry" Keys

General

Numerical Keypad

Enter Key

Cancel Key

AM/PM Key

Advance Day Key

"Program" Key

Programming User Programmable Safeties and Limits

Discharge Cut-Out

Ambient Temperature Limits

Pressure Control Programming

"Program" Key - Control Parameters

Rate Control and Anti-Recycle Settings

Temperature and Load Step Settings