Multiaqua MAC-036HE - Propylene Glycol Mixture Chart

Installation Notes: (continued)
Propylene Glycol must be added to the water used in the system. Propylene
helps prevent freeze-ups due to low ambient temperature conditions and low
chilled liquid solution temperatures. In comparison to water, Propylene Glycol
slightly lessens the temperature exchange in the chiller’s heat exchanger.
However, that is offset by the increased flow of liquid solution through the
piping system enabled by the Propylene Glycol. To determine the Propylene
Glycol content for various ambient temperatures, refer to Table 6.
In no instance should a Multiaqua chiller be installed with less than 10%
Propylene Glycol content in the piping system. Using less than the
recommended Propylene Glycol percentage content voids equipment
warranty.
Cold ambient mitigation is mandatory. Failure to do so will result in the
damage to components, property damage, and void warranty.
Table 6
Percent of Propylene Glycol to Water Content
Propylene
Glycol %
Water Flow
Capacity
Min. ambient
Temperature
GPM Adjustment
= 100 % Capacity
10%
x 1.020
x .99
26  F
x 1.01
20%
x 1.028
x .98
18  F
x 1.03
30%
x 1.036
x .98
8  F
x 1.07
40%
x 1.048
x .97
-7  F
x 1.11
50%
x 1.057
x .96
-29  F
x 1.16
.
Ethylene Glycol is environmentally hazardous and not recommended. Inhibited
Propylene Glycol (typical automotive coolant) is not to be used in a Multiaqua
Chiller under any circumstances. Dow Chemical's "Ambitrol" Glycol-based
coolant of food grade Propylene Glycol is suggested. Information on Ambitrol
is available from Dow at www.dow.com, search word "Ambitrol"
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