AUX EL Series Instrukcje Operacyjne Pobierz pdf (Strona 13)

09/11/2014 11 NI401

versus the pressure drop table (Table#3) and determine the actual flow rate. If the flow rate is low, recheck the

selection of the loop pump module model for sufficient capacity. If the model is correct, there is likely trapped

air or a restriction in the flow circuit.

System pressure should increase rapidly as the flush pump works to force more water into the system.

Additional flushing of the loop is needed if the water level in the loop falls. This shows that there is air in the

system. System operating pressures should be between 10 to 40 PSI.

Antifreeze

DO NOT mix more than 25% propylene glycol with water to achieve a lower than 15°F [-9°C] freeze

protection. (See Table 3) A more concentrated mixture cannot be pumped through the earth loop at low

temperatures. Lack of antifreeze will cause unit shutdown problems during cold weather operation (longest unit

run time) when the loop temperatures fall below the freeze protection of the antifreeze. Flow rate requirements

for closed loop solutions are higher than open loop systems because water temperatures supplied to the heat

pump are generally lower. Typically 2.0 to 3.0 gallons per minute (GPM) per ton are required for proper

operation of the heat pump and the earth coupled heat exchanger.

Table 3 – Antifreeze Percentages by Volume*

Minimum Temperature for Freeze Protection

10°F 16°F 17°F 21°F 25°F

Type -12°C -9°C -8°C -6°C -4°C

Methanol 25% 21% 18% 16% 10%

Propylene

Glycol

38% 30% 25% 22% 15%

Ethanol 22% 20% 18% 14% 10%

*Reference information only, see product manufacturer

specification for percentage.

WARNING

DO NOT USE CALCIUM AS ANTI-FREEZE. FOLLOW CGC/IGSHPA RECOMMENDATIONS

FOR THE APPROPRIATE TYPE AND AMOUNT OF ANTI-FREEZE.

WARNING

PREVENTING FREEZE-UP IS INSTALLER/USER RESPONSIBILITY. LEAKING HEAT

EXCHANGER OR PIPING (EXTERNAL OR INTERNAL WITHIN THE REFRIGERANT/

COMPRESSOR) ARE NOT COVERED BY WARRANTY.

Table 2 – Approximate Fluid Volume (gal)

per 100ft

Pipe Size Volume

Polyethylene

¾” IPS SDR 11 2.8

1” IPS SDR 11 4.5

1-1/4” IPS SDR 11 8.0

1-1/2” IPS SDR 11 10.9

2” IPS SDR 11 18.0

Rubber Hose 1” 3.9

Copper

1” 4.1

1.25” 6.4

1.5” 9.2

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 55 56

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