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...
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...
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 Connections
There are several methods for joining refrigerant piping to VRF System components and fittings. The following mechanical VRF Piping connections can save labor but will cost extra in material.
ZoomLockâ„¢ by Parker
This is a mechanical joint that can...
VRF Heat Recovery System
Using a VRF Heat Recovery system allows you to provide simultaneous cooling and heating. This means that one zone can be in cooling mode while another is in heating. This is not possible with a VRF...
VRF Manufacture Comparison
With so many VRF manufactures to compare, it’s hard to decipher all the variations between systems. Below you'll find a comparison of VRF manufactures such as, Daikin, Mitsubishi, LG, Carrier, Toshiba (Carrier), Fujitsu, Panasonic, Hitachi (York) and...
VRF Cost per Ton or Cost per Ft2 to Install?
How do you determine the cost per ton or cost per square foot for the installation of a VRF system?
What factors play a role in the VRF cost per ton...
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...
How to Estimate VRF Projects
HVAC Estimating is the foundation upon which all construction company profits are built. If you don’t get the estimates correct, your company won’t be in business very long. If you don’t understand your cost and...
DOAS - Energy Recovery
When is an Energy Recovery system required according to ASHRAE 90.1 (2013)?
ASHRAE 90.1 2013
(Energy Standards for Buildings, Except Low Rise Residential Buildings)
When using a VRF Dedicated Outside Air System (DOAS) to bring in ventilation air to...
