Liquid Level Sensor Modification RTAC

Liquid Level Sensor Modification - RTAC

Discussion:

RTAC chillers operating in various applications, under various conditions; exhibiting intermittent Liquid Level Sensor (LLS) abnormalities...resulting in various diagnostics:

• Pump Down Terminated
• Low Evaporator Temperature...Unit Off - Circuit 1 / 2
• Operational Pump Down into a vacuum
• Evaporator Refrigerant Drain - Circuit 1 / 2  ( Remote Evaporator Chillers ONLY )
• Low Suction Refrigerant Pressure - Circuit 1 / 2
• High Evaporator Refrigerant Pressure
• High Evaporator Water Temperature

Modification Parts KITs:

There are 4 kits available, depending on the specific RTAC chiller size and efficiency/performance configuration:

• KIT 17875 - 2 compressor

  • 140 TON STD, 120 TON HIGH

  • 155 TON STD, 130 TON HIGH
• KIT 17964 - 2 compressor
  • 170 TON STD / 140 TON PREM
  • 185 TON STD
  • 155 TON PREM
  • 200 TON STD
  • 170 TON PREM, 140 TON  XE 60 HZ
  • 225 TON STD 60 HZ
  • 185 TON PREM / 155 TON XE 60 HZ
  • 250 TON STD 60 HZ / 200 TON PREM / 170 TON XE 60 HZ
  • 225 TON HIGH / 250 TON HIGH 60HZ, 185, 200 TON XE 60 HZ
• KIT 17876 - 3 compressor
  • All units with 3 compressors
• KIT 17877 - 4 compressor
  • All units with 4 compressors

• HUS 04208
  • HOUSING; SPECIALTY, LIQUID LEVEL SENSOR
  • If there is a field requirement to replace a damaged RTAC Top-down LLS Canister (DO NOT ORDER THIS PART FOR FIRST TIME INSTALLATION)
• SEN 01552 - LIQUID LEVEL SENSOR; 3.54" [90MM] , TOP MOUNT

Note:  Each KIT listed contains all parts required for a single circuit modification (including the new housing and 90MM LLS).  Housing and Sensor part numbers listed are for service reference only.

Note:  Example piping/installation configuration:

Procedure Outline:

• Follow proper LOTO for chiller and/or circuit as required.
• Isolate evaporator by closing the appropriate refrigerant/oil isolation valves.
• Recover ALL refrigerant/oil from the affected circuit evaporator.
• Remove existing Liquid Level Sensor (LLS) canister and lines.
• From modification KIT...install the new top mounted LLS canister and lines.
  • NOTE:  New KITS do not contain existing brackets or mounting hardware.
• From modification KIT...install new 90MM top mounted LLS.
• Using TechView/KestrelView, make a local connection to the chiller controller (DynaView).
  • Select View \ Software...select Product 'RTA'; select Available Version 46.0 or newer (if not already installed).
  • Select 'Download Software to Main Processor'...
  • Once the correct MP software is loaded on the DynaView, if not already connected locally, make a local connection to the chiller controller (DynaView)
  • Select View \ Configuration \ Custom \ Circuit 'X' Liquid Level Sensor Type:  X13790508 ( 90 mm Top Mount Sensor )
  • 
  • ...next choose the 'Load Configurations' tab at the bottom of the screen to load the new configuration.
  • Loading the new configuration will result in TechView advancing to the 'Binding' process.  Once in BindingView, select and BIND in the new LLS to the appropriate circuit LLS LLID.
  • Exit BINDING back to UnitView.  Make sure there are not active diagnostics with the LLS.
• Pressure test evaporator.
• Evacuate and perform a rise test.
• Open up refrigerant/oil valve, and re-charge as necessary.

NOTE:

• This modification requires refrigerant handling...please follow all safety and standard refrigerant handling procedures and process per IOM; and per Ingersoll Rand / Trane EHS requirements.  This document does not replace, imply, or include any of those recommended/standard guidelines.

• Modification requires existing insulation to be removed.  Re-insulate all lines, canister, and brackets after modification.

FACTS:

• RTAC Liquid Level Sensor Top-Mount Retrofit