VRF selection, refrigerant piping, branch kits and leak safety.
Typical insulation thicknesses for VRF and split refrigerant pipes, a quick surface-temperature check against the dew point with a worked 3/4″ example, and the installation rules that matter most.
Refrigerant Pipe Insulation: Thickness and Condensation Read More »
A step-by-step method for VRF condensate drains: quantity, materials, diameters, the 1 % fall budget, pump lifts, ducted unit traps, vents, insulation and discharge through an air break.
VRF Condensate Drainage Design Read More »
How heat pump and heat recovery VRF differ, where each fits, the BS box design rules and a worked office floor comparing three heat pump systems with one heat recovery system.
VRF Heat Recovery vs Heat Pump Systems Read More »
The ten VRF design mistakes we see most in drawing reviews, from oversold connection ratios and missing capacity corrections to refrigerant concentration in small rooms and condensate falls.
10 Common VRF Design Mistakes Read More »
How to select VRF branch kits (refnet joints and headers) by downstream indoor capacity, with a worked six-unit example and the installation rules that keep refrigerant flow even.
VRF Branch Kits (Refnets): Selection and Installation Rules Read More »
How to size VRF gas and liquid lines by downstream capacity, check the length and height limits that catch most designers, and calculate the additional refrigerant charge — with a full two-floor example.
VRF Refrigerant Piping Design: Sizing, Limits and Charge Read More »
If the whole VRF charge leaks into the smallest room, is the concentration still safe? Here is the five-step EN 378 check, a worked store-room example that fails, and the fixes that work.
Refrigerant Leak Safety to EN 378: The Smallest Room Check Read More »
The connection ratio tells you whether an indoor/outdoor combination is allowed, not whether it is big enough. Here is the conservative rule we design with and a full outdoor unit selection you can copy.
VRF Connection Ratio: How to Select the Right Outdoor Unit Read More »