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SIM Inverter Monobloc Air-to-Water Heat Pump
SECTION 3: GLYCOL/WATER SYSTEM
Table 1 SIM Glycol Concentrations (10% Minimum, 50% Maximum)
Ethylene Glycol % 10 20 30 40 50
Min. Ambient Temp for Operation 23°F/-5°C 14°F/-10°C 2°F/-17°C -13°F/-25°C -36°F/-38°C
SpacePak Capacity Multiplier 0.98 0.96 0.93 0.91 0.89
Pressure Drop Multiplier (Cooling) 1.06 1.12 1.16 1.25 1.36
Pressure Drop Multiplier (Heating) 1.06 1.12 1.16 1.22 1.28
Minimum Expansion Volume / System Volume
Heating and Cooling (Gallons) 1 gallon expansion per 15 gallons system volume
Heating only, HP only (Gallons) 1 gallon expansion per 20 gallons system volume
Heating Only, with Boiler (Gallons) 1 gallon expansion per 15 gallons system volume
Propylene Glycol % 10 20 30 40 50
Min. Ambient Temp for Operation 26°F/-3°C 18°F/-8°C 8°F/-13°C -7°F/-22°C -29°F/-34°C
SpacePak Capacity Multiplier 0.99 0.98 0.96 0.93 0.88
Pressure Drop Multiplier (Cooling) 1.10 1.20 1.34 1.5 1.65
Pressure Drop Multiplier (Heating) 1.10 1.20 1.34 1.46 1.5
Minimum Expansion Volume / System Volume
Heating and Cooling 1 gallon expansion per 15 gallons system volume
Heating only, HP only 1 gallon expansion per 20 gallons system volume
Heating only, with Boiler 1 gallon expansion per 15 gallons system volume
Non use of propylene glycol will void warranty.
* A 35% concentration will prevent solid freezing, and protect from bursting, in all conditions. However, this solution
will become a thick sludge at extremely low temperatures, possibly resulting in pump overloading, pump damage, or
high pressures. Therefore this concentration should only be used in systems that will remain inactive during the winter.
Use the higher value shown for systems that must start and run at the coldest temperatures.
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