This chart shown on next page must be followed to de-
termine how much liquid SCA must be added to
precharge different quantities of make-up coolant (water
and low-silicate antifreeze). Remember, a service filter
must also be installed.
In addition to using the chart as shown, the system re-
quirements can be also calculated as shown below.
NOTE: It is important to know the cooling system capacity.
If not sure of system capacity, contact the equipment OEM.
The following two examples illustrate how to calculate the
required SCA quantity to add to the coolant to reach the
desired concentration level.
When mixing 11 to 15 gallons fo Coolant, 4 pints of DCA4
liquid must be added to obtain the correct SCA concen-
tration level.
Example
15 gallons X 1.5 units
=
22.5 units
gallon
22.5 units ÷ 5 units
=
4.5 pints DCA4
pint DCA4
or approximately 4 pint of DCA4
For an 80-gallon system, three (3) gallons of DCA4 liquid
must be added to precharge the coolant to the correct
SCA concentration level.
Example
80 gallons X 1.5 units
=
120 units
gallon
120 units ÷ 20 units
=
6 half gallon containers of DCA4
1/2 gallon DCA4
or 3 gallons of DCA4
Coolant Replacement Requirement
Drain and flush the cooling system after 2 years, 6,000
hours, or 240,000 miles of service. Refill with new Heavy
Duty Coolant and install the correct service coolant
filter.
Supplemental Coolant Additives (SCA’s) Section 1 - Cooling System
N14Page 1-8
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