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General| Model | RTAA-70 |
|---|---|
| Type | Air-Cooled Chiller |
| Cooling Capacity | 70 tons |
| Compressor Type | Scroll |
| Sound Level | 75 dBA |
| Voltage | 460V |
| Refrigerant | R-22 (CFC based) |
Details on unit nameplates and their information.
Procedures for inspecting the unit upon delivery and checking for damage.
Overview of the RTAA series units and their key features.
Explanation of how the unit's model number is structured and what each part signifies.
Contractor's duties for installing the RTAA unit according to manual specifications.
Guidelines for storing the outdoor unit prior to installation, including periodic checks.
Considerations for selecting an appropriate installation site, including noise and clearances.
Requirements for the unit's foundation to ensure stability and proper support.
Recommended space around the unit for installation and maintenance access.
Instructions for safely moving and lifting the chiller unit, including weight considerations.
Methods to minimize sound and vibration, such as direct mounting or isolators.
Procedures to ensure the unit is properly leveled end-to-end and front-to-back.
Guidelines and precautions for connecting the evaporator's water piping.
Information on the drain connection for the evaporator and its servicing.
Details on the optional chilled water flow switch and its installation.
Proper installation of relief valves in the evaporator inlet piping.
Methods to protect the unit from freezing in subfreezing ambient temperatures.
How the system is configured and requirements for refrigerant piping.
Steps to determine the correct outside diameter for field-installed liquid and suction lines.
Guidelines for installing refrigerant piping, including materials and pitch.
Instructions for installing refrigerant sensors in the piping.
Procedures for testing the system for leaks and performing evacuation.
Determining and adding the correct refrigerant and oil charge for the system.
Calculating the amount of oil to add based on refrigerant added.
Responsibility for venting relief valves on remote evaporators.
Compliance with codes and ensuring proper electrical data for wiring.
Components the installer must provide, such as wiring and disconnect switches.
Sizing and selecting power supply wiring according to codes and unit requirements.
Connecting interlocks for chiller water pump operation and preventing evaporator freeze-up.
Guidelines for wiring remote devices to the UCM using shielded, twisted-pair conductors.
Using contact closures for auxiliary control of individual refrigerant circuits.
Setting the chilled water setpoint using remote inputs like resistor/potentiometer.
Setting the current limit setpoint independently using remote inputs.
Connecting the unit for information exchange with higher-level control devices.
Steps for connecting the communication link wiring to the Tracer unit and UCM.
Function of the LCI-C module as a translator for building automation systems.
Mounting and wiring instructions for the remote Clear Language Display.
Hardware and steps for physically mounting the remote CLD display box.
Wiring requirements for the remote CLD, including power and communication link.
How to set the ICS address for the Remote CLD.
Capability of the Remote CLD Panel to communicate with multiple units.
Description of the refrigeration cycle and its control components.
Overview of the compressor components, motor, and rotors.
Details on the semi-hermetic, direct-drive helical rotary compressor rotors and their function.
How compressors are started and their load is balanced based on cooling demand.
Explanation of the oil's path and function within the system, including the oil separator.
How oil is supplied to the compressor bearing housings.
The circuit for oil flow to the compressor rotor housing for lubrication and sealing.
How the female unloader valve controls compressor capacity based on pressure.
Purpose of the oil filter and its role in compressor protection.
How condenser fans are staged based on pressure and temperature inputs.
Description of the keypad and display interface for operator interaction.
How to select and view different operational reports on the display.
Accessing operator settings, service settings, and service tests.
Procedures for entering service and configuration menus using passwords.
Functionality of the Auto and Stop keys for controlling unit operation.
How the UCM monitors and compares evaporator water temperatures.
How the current limit setpoint is entered and used to modulate compressor slide valves.
Method to prevent unit start-up below a set outdoor air temperature.
Procedure to confirm the proper operation of the electronic expansion valve.
Protection against freezing caused by low leaving water temperature.
Protection for both circuits from low saturated evaporator refrigerant temperature.
How low ambient temperature cutouts are ignored during initial circuit starts.
Monitoring current in each phase to calculate and address imbalance.
Explanation of diagnostic message types and their associated actions.
Verifying the unit's power supply voltage meets specifications and checking for imbalance.
Confirming the correct electrical phase sequence for compressor motor rotation.
Establishing proper chilled water flow through the evaporator for optimal performance.
Measuring and comparing the chilled water pressure drop through the evaporator.
Adjusting settings via the Clear Language Display keypad.
Checking normal suction superheat levels for optimal compressor operation.
Verifying normal subcooling ranges and contacting service if issues arise.
Steps for temporarily stopping and restarting the unit.
Procedures for taking the system out of service for extended periods.
Steps to follow when restarting the unit after an extended shutdown.
Routine checks after the unit has been operating and stabilized.
Performing weekly procedures plus measuring superheat and subcooling.
Comprehensive maintenance procedures including oil analysis and component inspection.
Procedures for cleaning condenser coils to maintain efficiency and prevent damage.
Steps for chemically cleaning the evaporator if backflushing is unsuccessful.
Importance of proper water treatment to prevent scale, algae, or corrosion.
Procedure to check the oil level in the oil separator.
Guidelines for replacing the oil filter if oil contamination is detected.
Procedures for isolating and repairing refrigerant issues on the low side of the unit.
Steps for isolating and repairing refrigerant issues on the high side of the unit.
Procedures for recharging the unit with refrigerant after repairs or removal.
Guidelines for storing the pump package unit when not in immediate use.
Advice on piping connections to avoid air pockets and strain on the unit.
Importance of checking and tightening piping and wiring connections after transit.
Reviewing system information and visually inspecting components before startup.
Features of the control panel, including starters, lights, and protection devices.
Conditions under which the unit will operate and wiring requirements.
Steps to verify power, water, and valve positions before pump operation.
Procedures for starting up the pump system and ensuring proper operation.
Procedures for temporarily or long-term shutdown of the pump package.
Periodic maintenance requirements for the pumps, including strainer cleaning and motor greasing.
Common problems with the pump package and their possible causes and solutions.
Information on specific electrical characteristics found on unit nameplates.
