35
IOM, BS/BT Models
Enertech Global
Section 6: Unit Piping Installation
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.
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
Table 5: Antifreeze Percentages by Volume
Antifreeze
Type
Minimum Temperature for
Freeze Protection
10°F
-12.2°C
15°F
-9.4°C
20°F
-6.7°C
25°F
-3.9°C
ProCool
(Ethanol)
25%
22%
17%
12%
Methanol
25%
21%
16%
10%
Propylene
Glycol
38%
30%
22%
15%
Geothermal
Transfer
Fluid (GTF)
Mix according to manufactures’s
directions on container label
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.
0.9600
0.9700
0.9800
0.9900
1.0000
1.0100
1.0200
1.0300
1.0400
1.0500
-5
0
5
10
15
20
25
30
32
Specific Gravity
Freeze Protection (deg F)
Procool
Methanol
Propylene Glycol
NOTE:
Most manufacturers of antifreeze
solutions recommend the use of de-ionized
water. Tap water may include chemicals that
could react with the antifreeze solution.
⚠
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.