Chiller Commissioning Expertise

General

Ensure that individual components are installed and integrated to operate on a system level per the design intent and sequence of operations.

Sensors

Verify that the sensor installation and calibration is sufficient to achieve the design control strategies.

Safeties, Interlocks, and Alarms

Verify that all safeties, interlocks, and alarms are programmed (or hard-wired, if applicable) and functioning correctly. Safety and interlock tests, as well as some test procedures and loop tuning efforts (for example, high or low refrigerant cut-out set points, emergency shut-down procedures, and failure/back-up system operation)

Unit Capacity

We make sure that the chiller meets the specified performance requirements for temperature or part-load operation, as well as specified energy efficiency requirements.

Staging

We Validate that isolation valves are installed and operating correctly.
We ensure that the chillers and primary CHW pumps stage up and down appropriately, per the sequence of operations.
We make sure that the time delay between chiller start/stop commands follows the design sequence of operations.

Reset Controls

Verify proper reset parameters, which are verified per the design sequence of operations.
Verification of proper coordination between individual set points and reset strategies. The chilled water temperature reset strategy to coordinated with discharge air temperature (DAT) reset for each air handling unit.
Corroborate that the chilled water supply temperature reset does not adversely impact supply air dehumidification.

Control Accuracy and Stability

Proper control sequence and integration of all components (including set points and reset strategies, start-up / shut down procedures, and time delays).
PID loops generate the proper set points (e.g. CHW temperature) based on the reset parameters.
All PID control loops achieve stability (i.e. no hunting) within a reasonable amount of time (typically no more than five minutes) after a significant load change such as start-up and automatic or manual recovery from shut down.

Component-Level Testing.

 

System-Level Testing.

 

Key Preparations and Cautions

Successful execution of the chiller functional performance tests .
Testing chilled water temperature reset strategy when there is minimal to no cooling load.
Resetting the chilled water temperature to save chiller energy can result in a loss of humidity control within the building.

Necessary Instrumentation

  • Temperature measurement devices (hand-held devices to calibrate existing sensors)
  • Differential pressure measurement devices (to test installed flow meters)
  • Amperage and voltage measurement devices (for calculating chiller input power)
  • Flow measurement devices (installed or hand-held devices to measure water flows)
  • Data loggers (to supplement existing sensors to verify system operation)


Chiller System Pre-functional and Functional Test Procedures

  • Calibration and Leak-By Test Procedures.
  • Chilled Water System Verification Test Procedure.
  • Standard Functional Tests for Chilled Water Systems.
  • Verification and Functional Performance Test Plan for EMS.
  • Chiller Pre-functional Checklist and Functional Performance Verification.
  • Chiller Procedures.
  • Packaged Air-Cooled Chiller.
  • Chiller System Functional Test.
  • Chilled Water System Sequence of Operations.
  • Air-Cooled Chiller Functional Tes.t
  • DDC Commissioning Acceptance Procedures: Standard Chilled Water System Start/Stop Control.
  • Component-Level Functional Test Procedures.
  • Chilled Water Piping Pre-functional Checklist.
  • Hot Water System Pump Test.
  • Chilled Water System Pump Test.
  • Condenser Water System Pump Test.