159
Hot Gas Bypass
Systems should be designed to avoid HGBP whenever possible. But, if HGBP is necessary for the
application - like 100% OA - then the system must be designed to support HGBP.
As an example, the line lengths are limited to 75 feet.
For more information, please reference Trane Application Guide Hot Gas Bypass Installation Guidelines
for Direct Expansion (DX) Equipment, APP-APG017-EN.
Line Sizing
For line lengths 25 feet or less use the line sizes in the unit IOM.
For line lengths greater than 25 feet, use the line sizes in the Odyssey Application Guide (SS-APG008*-
EN).
Oil-Traps
Trane does not recommend oil traps on any application.
Leak Checking
Pressurize the system through the gauge port with dry nitrogen to 200 psi.
System Evacuation
Attach appropriate hoses from manifold gauge to gas and liquid line pressure taps.
Evacuate the system to hold a 500 micron vacuum.
Close off valve to vacuum pump and observe the micron gauge. If gauge pressure rises above 500
microns in one minute, then evacuation is incomplete, or the system has a leak.
If vacuum gauge does not rise above 500 microns in 10 minutes, the evacuation should be complete.
To Next Page
Loading...
