Hussmann Proto-Aire, Руководство по установке

Страница: 54 / 124

Protocol™ Installation and
Service Manual
Air Vent Valves
Manual air vent valves are recommended. Air vent valves should be located at piping high
points where air will tend to collect. Momentarily open these vents and release trapped air
a few times during startup.
Tie-Ins to Supply Headers
Branch supply pipes SHOULD NOT tie into the bottom of main supply pipes. Always tie
into top of a main supply pipe; that is, the “T” fitting should point UP, NOT DOWN.
Pipe Supports
Pipe support should be provided as follows:
Nominal Pipe Size,
inches
Distance Between Supports,
feet
Schedule 40 Pipe @ 100 °F
Distance Between Supports,
feet
Schedule 80 Pipe @ 120 °F
1.0 4.5 3.5
1.5 5.0 3.5
2.0 5.0 4.0
3.0 6.0 4.5
4.0 6.5 5.0
6.0 7.5 6.0
Do not clamp supports tightly – this restricts axial movement of the pipe. Supports should
provide a smooth bearing surface that conforms to the bottom of the pipe, and should be a
minimum of 2 inches wide.
Exposure to Direct Sunlight
Piping that will be exposed to direct sunlight should be shaded or covered. A thin layer of
insulation is adequate for this.
Leak Check
Check for leaks in the piping before startup by filling with pressurized water at 50 psig.
Cleaning and Flushing
The pipe loop should be cleaned before the system is put into service. Fill the closed loop
with a solution of 1% trisodium phosphate and (99%) water, by weight.
Circulate the detergent/water solution for 24 hours.
Drain the loop and refill with fresh water. Circulate for at least 3 hours.
Drain and refill again. Repeat until all phosphate is gone.
Filling
The water loop MUST have adequate corrosion protection. In most situations, using fully
inhibited, industrial grade ethylene glycol or propylene glycol 30% by volume with water
50