Bryant TSTATBBN2S01-C Manual de instalación descargar pdf (Pagina 7)

Page 7

Type Minimum Temperature for Freeze Protection

10°F 15°F 20°F 25°F

Methanol 25% 21% 16% 10%

100% USP food grade Propylene Glycol 38% 30% 22% 15%

GROUND LOOP APPLICATION

Piping Installation

The typical closed loop ground source system is shown

in Figure 10. All earth loop piping materials should be

limited to only polyethylene fusion in inground sections

of the loop and galvanized or steel ﬁ tting should not be

used at any time due to their tendency to corrode. All

plastic to metal threaded ﬁ ttings should be avoided as well

due to their potential to leak in earth coupled applications

and a ﬂ anged ﬁ tting substituted. P/T plugs should be used

so that ﬂ ow can be measured using the pressure drop of

the unit heat exchanger in lieu of other ﬂ ow measurement

means. Earth loop temperatures can range between

25-110°F and 2.25 to 3 gpm of ﬂ ow per ton of cooling

capacity is recommended in these applications. Upon

completion of the ground loop piping, pressure test the

loop to assure a leak free system. Horizontal Systems:

Test individual loops as installed. Test entire system when

all loops are assembled.

Vertical U-Bends and Pool Loop Systems: Test Vertical

U-bends and pond loop assemblies prior to installation

with a test pressure of at least 100 psi.

Flushing the Earth Loop

Once piping is completed between the unit, ﬂ ow center

and the ground loop (Figure 10), ﬁ nal purging and

charging of the loop is needed. A ﬂ ush cart (at least a 1.5

hp pump) is needed to achieve adequate ﬂ ow velocity

in the loop to purge air and dirt particles from the loop

itself. Antifreeze solution is used in most areas to prevent

freezing. All air and debris must be removed from the

earth loop piping system before operation. Flush the

loop with a high volume of water at a high velocity (2

fps in all piping), both directions. The steps below must

be followed for proper ﬂ ushing. Fill loop with water

from a garden hose through ﬂ ush cart before using ﬂ ush

cart pump to ensure an even ﬁ ll. Once full, do not allow

the water level in the ﬂ ush cart tank to drop below the

pump inlet line or air can be pumped back out to the

earth loop. Try to maintain a ﬂ uid level in the tank above

the return tee so that air can not be continuously mixed

back into the ﬂ uid. 50 psi surges can be used to help

purge air pockets by simply shutting off the return valve

going into the ﬂ ush cart reservoir. This "dead heads"

the pump to 50 psi. To purge, dead head the pump until

maximum pumping pressure is reached. Open the return

valve and a pressure surge will be sent through the loop

to help purge air pockets from the piping system. Notice

the drop in ﬂ uid level in the ﬂ ush cart tank. Note: If air

is purged from the system, the level will drop only 1-2

inches in a 10" diameter PVC ﬂ ush tank (about a half

gallon) since liquids are incompressible. If the level drops

more than this, ﬂ ushing should continue since air is still

being compressed in the loop ﬂ uid. Do this "dead head"

procedure a number of times.

When the ﬂ uid level is dropping less than 1-2" in a 10"

diameter tank the ﬂ ow can be reversed. Finally the dead

head test should be checked again for an indication of air

in the loop. This ﬂ uid level drop is your only indication of

air in the loop.

Pipe Size Volume

Copper 1" 4.1

1.25" 6.4

1.5" 9.2

Rubber Hose 1" 3.9

3/4" IPS SDR11 2.8

1" IPS SDR11 4.5

1 1/4" IPS SDR11 8.0

Polyethylene 1 1/2" IPS SDR11 10.9

2" IPS SDR11 18.0

1 1/4" IPS SCH40 8.3

1 1/2" IPS SCH40

10.9

2" IPS SCH40 17.0

Unit Heat Exchanger Typical 1.0

Flush Cart Tank 10" diam x 3 ft 10.0

Table 2. Approximate Fluid Volume (gal.) per 100' of Pipe

Table 3. Antifreeze Percentages by Volume

1 2 3 4 5 6 7 8 9 10 11 12 ... 31 32

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