What is VRF
VRV Variable Refrigerant Volume systems were invented in Japan in 1982 by Daikin and brought to the United States in 2004. These systems are used worldwide. Daikin VRV (Variable Refrigerant Volume) is their trademarked name, that’s why...
VRF System Control Wiring
This VRF System control wiring is for a VRF VRV Heat Recovery System with single port branch selector boxes. The control wiring is very simple, it’s basically two 18 gauge wires that go from the thermostat...
Tenant Submetering
How do you bill tenants for their share of the use of a piece of air conditioning equipment that is shared amongst more than one tenant in your building? If you have a VRF Air Conditioning system, where...
VRF System Cost
We know that VRF system cost varies based on many factors which must be considered when budgeting or bidding on a commercial HVAC project. Of course, it’s not the best option to provide a GMP (Guaranteed Maximum...
VRF Ventilation
The building requirement for ventilation air and the methods of delivering this air vary by geographic location. We’ll discuss several methods commonly found in various region of the United States. Indoor air quality (IAQ) is important for occupant...
This Mitsubishi Hybrid VRF System is a Heat Recovery System that uses Refrigerant on the primary side of the branch controller box and water on the secondary side to the indoor units. This VRF system mixes the best of...
How Much does a VRF System Cost per Ton ($/Ton) or per Square Foot ($/Ft2)? How many Ft2/Ton should you figure? How much does the Electrical Cost per Indoor Unit ($/IDU)? Track all of these and MORE with the...
ZoomLock Cost Analysis
Determining if there is value in using a press-fit joint such as ZoomLockâ„¢ requires that you look at several factors that impact cost and quality. We covered the technical aspects of ZoomLockâ„¢ in another article; see ZoomLock...
Refrigerant Monitoring Code Requirements
ASHRAE 15 requires the monitoring of refrigerant leaks under certain conditions within a mechanical room, but what about an occupied space where refrigerant is circulated through VRF/VRV (Variable Refrigerant Flow) Indoor Fan Coils? When is a...
VRF Piping Hangers and Expansion Loops
When hanging or fastening VRF copper refrigerant piping that involves long runs, then some form of considerations needs to be made for expansion due to temperature differences.
If no allowances are made for expansion in...
