York RecipPak YEAJ66HT9

Questions and Answers

O
olsonjenniferAug 15, 2025
Why is my York RecipPak YEAJ66HT9 showing a 'Low Suction' fault?
- S
  Sabrina EvansAug 15, 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.
L
Lori PriceAug 18, 2025
Why does my York RecipPak YEAJ66HT9 Chiller show a 'High Dsch' fault?
- C
  Chad JohnsonAug 18, 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.
J
James SandersAug 21, 2025
What to do if my York RecipPak YEAJ66HT9 displays a 'Low Oil Press' fault?
- A
  Anna SimonAug 21, 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.
K
Kevin PhelpsAug 25, 2025
How to troubleshoot a York RecipPak YEAJ66HT9 Chiller with no display on the panel?
- J
  James RochaAug 25, 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.
D
Danielle MillerAug 27, 2025
What does '?NO RUN PERM?' mean on my York RecipPak YEAJ66HT9 Chiller and how do I fix it?
- N
  Nicole KnightAug 27, 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.
M
mark66Aug 30, 2025
What causes a 'High Ambient Temp' fault on my York RecipPak YEAJ66HT9 Chiller?
- J
  Jonathan NicholsonAug 30, 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.
H
harrisjasonSep 2, 2025
How to resolve low compressor oil level on York Chiller?
- A
  andersonjessicaSep 2, 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
Samantha ScottSep 5, 2025
What to do if my York RecipPak YEAJ66HT9 Chiller shows a 'Low Water Temp' fault?
- K
  karen22Sep 5, 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.
S
Samantha HenrySep 8, 2025
Why won't the compressor load on my York RecipPak YEAJ66HT9 Chiller?
- T
  tracymillsSep 8, 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.
M
Michael MorrowSep 12, 2025
What does it mean when my York RecipPak YEAJ66HT9 Chiller shows a 'Low Ambient Temp' fault?
- A
  Amanda HillSep 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.

Summary

GENERAL INFORMATION

UNIT NOMENCLATURE

Explains the structure and meaning of the chiller model number.

COMPRESSOR NOMENCLATURE

Z MODELS

Details the nomenclature for Z model compressors.

J MODELS

Details the nomenclature for J model compressors.

OPERATIONAL LIMITATIONS

VOLTAGE LIMITATIONS

Specifies the acceptable voltage ranges for safe chiller operation.

TEMPERATURES AND FLOWS

Lists temperature and flow parameters for various chiller models.

DIMENSIONS

ELECTRICAL DATA

WIRING DIAGRAMS

INSTALLATION

INSTALLATION CHECK LIST

A checklist of essential steps before placing units into operation.

LOCATION AND CLEARANCES

Guidelines for selecting an appropriate installation site and necessary clearances.

FOUNDATION

Requirements for a stable and level foundation for unit placement.

CHILLED LIQUID PIPING

CONNECTION DIAGRAM (SYSTEM WIRING)

UNIT CONTROLS AND OPERATION

INTRODUCTION

Overview of the microprocessor control system's capabilities and features.

MICROPROCESSOR BOARD

Details the function and operation of the central control unit.

DISPLAY KEYS

Chilled Liquid Temps

Shows chiller leaving and return water temperatures.

Ambient Temp

Shows the current outdoor ambient air temperature.

OPTIONS

TABLE 1 - SWITCH POSITION AND DISPLAY

SWITCH 1, SWITCH 4, SWITCH 2, SWITCH 5, SWITCH 3, SWITCH 6

STATUS KEY

UNIT SWITCH IS IN THE OFF POSITION

Indicates the main unit ON/OFF switch is in the OFF position.

DAILY SCHEDULE SHUTDOWN

Informs that the chiller is not running due to the programmed daily schedule.

CHILLER FAULTS, SYSTEM FAULTS

ENTRY KEYS

Numerical Keypad

Details the numerical keypad used for programming values.

PROGRAM KEY

DISCHARGE CUT-OUT

Sets a backup for the mechanical high pressure cut-out.

SUCTION PRESSURE CUT-OUT

CLOCK KEYS

Set Time

Programs the system clock, date, and time.

SELECTION OF RETURN OR LEAVING CHILLED LIQUID CONTROL

GENERAL

Mode selection overview for water temperature control.

PROGRAMMING RETURN WATER CONTROL

Chilled Liquid Temp;Range

Sets the desired chilled liquid temperature and its acceptable control range.

PROGRAMMING RETURN WATER RATE CONTROL

PROGRAMMING LEAVING WATER CONTROL

RATE CONTROL TEMP

RATE SENSITIVITY

FIG. 15 - 5 STEP LOADING;UNLOADING (RETURN WATER CONTROL)

LOADING AND UNLOADING LEAVING WATER TEMPERATURE CONTROL

SYSTEM SAFETIES

MANUAL RESET SAFETIES

Details safeties that shut down the system and require manual reset.

Motor Current Safety

Protects the motor from damage due to low or high current conditions.

Suction Pressure Safety

Prevents operation under low refrigerant conditions to avoid evaporator freeze-up.

Oil Pressure Safety

Discharge Pressure Safety

Pumpdown Safety

AUTOMATIC RESET SAFETIES

Low Water Temperature Safety

Protects the evaporator from freezing by monitoring chilled liquid temperature.

High Ambient Temperature Safety

Shuts down the chiller if ambient temperature exceeds operational limits.

Flow Switch

Monitors water flow to prevent evaporator freeze-ups.

INTERNAL TIMERS AND PUMPDOWN CONTROLS

ANTI-RECYCLE TIMER

Sets the minimum time before a compressor can restart after shutdown.

PRINT KEYS

REMOTE PRINTOUT

Obtains printouts of system data or fault history.

LOCAL DISPLAY READOUT

Oper Data

Provides access to real-time system operating data for monitoring.

UNIT ON; OFF SWITCH

UNIT ON;OFF SWITCH

Controls the overall operation of the chiller unit.

SYSTEM SWITCHES

Allows selective activation or deactivation of individual refrigerant systems.

LEAD;LAG COMPRESSOR SELECTION

MEMORY BATTERY BACK-UP

EMS;BAS CONTROLS

REMOTE START;STOP BY A CYCLING DEVICE OR TIME CLOCK

Details how to remotely start or stop the chiller using external devices.

REMOTE SETPOINT RESET (REMOTE RESET TEMP RANGE)

Allows remote adjustment of the water temperature setpoint.

FAN CONTROL STRATEGY ABOVE 25°F AMBIENT

COMPRESSOR CAPACITY CONTROL

“Z” COMPRESSOR (STYLE B) LOADING;UNLOADING

J COMPRESSOR (STYLE G) LOADING;UNLOADING

SYSTEM START-UP CHECKLIST

CHECKING THE SYSTEM 24 HOURS PRIOR TO INITIAL START-UP (NO POWER)

Pre-start checks for unit, piping, and electrical connections.

INITIAL START-UP

CHILLED LIQUID TEMPERATURES

Parameters for recording chilled liquid temperatures during start-up.

CHECKING SUPERHEAT AND SUBCOOLING

OPERATING SEQUENCE

PREVENTATIVE MAINTENANCE

DAILY MAINTENANCE

Recommended daily checks for oil level, pressure, and superheat.

ANNUAL MAINTENANCE

Annual checks including controls, oil, and refrigerant circuits.

OPTIONS

CONDENSER WATER PUMP CONTACT;RUN STATUS OPTION

Option to control condenser water pump or indicate run status.

EVAPORATOR WATER PUMP CONTACT OPTION

0°F LOW AMBIENT OPTION

Operation

How the low ambient option reduces condenser capacity for cold weather operation.

Programming

Ambient and Pressure Fan Control 0°F - 25°F

Fan control strategy for ambient temperatures between 0°F and 25°F.

Ambient and Pressure Fan Control 25° - 45°F

Pressure Control Only, Fan Control by Discharge Pressure

HOT GAS BYPASS (LOADMINDER) OPTION

General

Explains the purpose of the hot gas bypass option for load management.

LWT Control Hot Gas Operation

How hot gas bypass functions with leaving water temperature control.

FIELD INSTALLATION

HIGH AMBIENT OPTION

Details the components and operation of the high ambient option.

LOCAL PRINTER OPTION

Installation Limitations

Printer Configuration

OPTIONAL TAMPERPROOF ENCLOSURE (WIRE GRILLE)

General

Describes the purpose and components of the wire grille enclosure.

Installation

Instructions for installing the wire grille tamperproof enclosure.

OPTIONAL DECORATIVE TAMPERPROOF ENCLOSURE (LOUVERED & WIRE GRILLE)

General

Describes the decorative/tamperproof enclosure with louvers and grilles.

Installation

Instructions for installing the louvered and wire grille enclosure.

OPTIONAL DECORATIVE TAMPERPROOF ENCLOSURE (LOUVERED)

General

Describes the decorative/tamperproof enclosure with louvers.

Installation

Instructions for installing the louvered enclosure.

BAS INTERFACE OPTION (REMOTE RESET OPTION)

0-10 VDC

Wiring and programming for 0-10VDC remote temperature setpoint offset.

4-20 mA

Wiring and programming for 4-20mA remote temperature setpoint offset.

Dry Contact

Wiring and programming for dry contact remote temperature setpoint offset.

TROUBLESHOOTING CHART

No display on panel Unit will not operate

Troubleshooting steps for when the unit fails to power on or display any information.

Low Suction Fault

High Dsch Fault

Chiller Fault: Low Water Temp

Compressor wont load