Variable Refrigerant Flow/Variable Refrigerant
Volume (VRF/VRV) systems have been around for years, but installation and
commissioning of these systems is rife with pitfalls and problems. Manufacturers
have specific requirements for installation and operation and the system
designer should identify system requirements such as cooling only, heating or
cooling, or simultaneous heating and cooling. VRF/VRV systems can be purchased
and installed by contractors without knowing system requirements and with
little support from the product vendor. All of this can lead to systems not
operating per the design intent or, worse, an installed system that can’t meet
the design intent.
Understanding the basic system components, how they should be installed and how
they should operate, is the start of any commissioning process. Will the system
be required to heat and cool? Simultaneously or not? Is the system provided
with a heat pump or with heat recovery? What specific components should be
installed? What items should be reviewed during pre-functional checks, and what
operational tests should be completed? How do these systems relate to a
Dedicated Outside Air System (DOAS), and what should we look for during the
commissioning process?
Find out more about proper installation and commissioning the VRF/VRV system to
ensure a reliable means for cooling and/or heating a building.
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