23
IOM, XT Models
Enertech Global
Propylene Glycol: Non-toxic, non-corrosive, mid to
high price, poor heat transfer, high viscosity when
cold, and can introduce micro air bubbles when
adding to the system. It has also been known to
form a “slime-type” coating inside the pipe. Food
grade glycol is recommended because some of the
other types have certain inhibitors that react poorly
with geothermal systems. A 25% brine solution is a
minimum required by glycol manufacturers, so that
bacteria does not start to form.
Ethylene Glycol: Considered toxic and is not
recommended for use in earth loop applications.
GS4 (POTASSIUM ACETATE): Considered highly
corrosive (especially if air is present in the system)
and has a very low surface tension, which causes
leaks through most mechanical fittings. This
brine is not recommended for use in earth loop
applications.
Notes:
1.
Consult with your representative or distributor
if you have any questions regarding antifreeze
selection or use.
2.
All antifreeze suppliers and manufacturers
recommend the use of either de-ionized or
distilled water with their products.
Antifreeze Charging
Calculate the total amount of pipe in the system
and use Table 4 to calculate the amount of volume
for each specific section of the system. Add the
entire volume together, and multiply that volume by
the proper antifreeze percentage needed (Table 5)
for the freeze protection required in your area. Then,
double check calculations during installation with
the proper hydrometer and specific gravity chart
(Figure 9) to determine if the correct amount of
antifreeze was added.
⚠
CAUTION
⚠
USE EXTREME CARE WHEN OPENING, POURING,
AND MIXING FLAMMABLE ANTIFREEZE SOLUTIONS.
REMOTE FLAMES OR ELECTRICAL SPARKS CAN
IGNITE UNDILUTED ANTIFREEZES AND VAPORS.
USE ONLY IN A WELL VENTILATED AREA. DO
NOT SMOKE WHEN HANDLING FLAMMABLE
SOLUTIONS. FAILURE TO OBSERVE SAFETY
PRECAUTIONS MAY RESULT IN FIRE, INJURY, OR
DEATH. NEVER WORK WITH 100% ALCOHOL
SOLUTIONS.
Table 4: Pipe Fluid Volume
Type
Size
Volume Per 100ft
US Gallons
Copper
1” CTS
4.1
Copper
1.25” CTS
6.4
Copper
1.5” CTS
9.2
HDPE
.75 SDR11
3.0
HDPE
1” SDR11
4.7
HDPE
1.25” SDR11
7.5
HDPE
1.5: SDR11
9.8
HDPE
2” SDR11
15.4
Additional component volumes:
Unit coaxial heat exchanger = 1 Gallon
Flush Cart = 8-10 Gallons
10’ of 1” Rubber Hose = 0.4 Gallons
Section 5: Unit Piping Installation