Sterlco GP Series 5-15 HP Portable Chillers - Manual (Page 11)

GP Series Portable Chillers Chapter 2: Functional Description 11 of 93
Process Fluid Temperature – The standard range for the leaving fluid temperature for this
series of packaged chillers is 20°F to 80°F (-6.7°C to 26.7°C). When the process requires
fluid temperatures below 45°F (27.2°C) it is imperative that the process fluid is a mix of an
industrial grade ethylene or propylene glycol and water to the proper percentage (by volume)
to protect the system. See Chapter 3 for a further discussion regarding the use of glycol
within the system for these applications.
ACS Group does not warrant the freeze up of the evaporator
under any circumstances.
Chilled Water Circuit
Cooling water “To Process” and “From Process”
connections are made at the female NPT couplings
provided outside the unit.
Warm coolant (water and glycol mixture) returns
from the process and goes into the reservoir tank.
The coolant is then pumped through the evaporator
where it is cooled.
The coolant flows to the process and returns to
repeat the cycle.
A process water bypass valve located between the supply
line and reservoir tank (single pump models only) allows
minimal flow through the unit during the intermittent
fluctuating flow conditions. It is not intended to provide
continuous full bypass flow.
This minimal flow allows the flow switch to make when
the process flow is stopped. If the flow switch is not made the controller shuts down the
compressor to prevent freezing up the evaporator.