Mueller Compact Chiller Models CP2-10 and CP2-20
Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238
Revised January 31, 2019
2.4 LIQUID SOLUTION FLOW COMPONENTS
A 3 hp centrifugal pump circulates the chilled solution from the reservoir, through the evaporator heat exchangers
and remote Accu-Therm plate cooler, and back to the reservoir.
The chilled-liquid circulation system incorporates a threaded suction screen located internally in the reservoir at
the suction connection. This will prevent particulate matter from entering the circulation pump, evaporator heat
exchanger, and Accu-Therm plate cooler. It should be removed and cleaned as necessary.
Isolation valves are provided in the liquid solution lines for servicing the pump.
The system has two liquid solution flow switches that utilize normally open (N.O.) contacts connected in series to
the chiller control. In the event of a pump failure, flow blockage, or loss of liquid solution, the paddle in one of the
flow switches will open and de-energize both condensing units. In the event that one of the flow switches breaks
the control circuit and de-energizes the condensing units, the units will re-energize when the switch is closed
again, indicating adequate fluid flow.
This condition indicates that there was a flow restriction and a service technician should be contacted to
troubleshoot and repair the cause prior to multiple restarts.
IMPORTANT: The above condition could be caused by improper temperature settings of the electronic
temperature control. Multiple restarts prior to repair or adjustment could cause a non-warranted failure
of an evaporator due to expansion from freezing.
The 90-gallon insulated reservoir is constructed of polyethylene. The cover should remain on the reservoir at all
times to prevent particulate and contaminants from entering the liquid solution.
2.5 ELECTRICAL COMPONENTS
The Mueller compact chiller comes with a complete electrical control system. The electronic temperature control
is housed in a separate enclosure. The multi-stage chiller control must be mounted and wired to the flow switches
condensing units, temperature sensors, and pump.
The power supply must be connected to a 240 volt, 60 hertz, single-phase fused disconnect, fused at a maximum of
20 amps.
IMPORTANT: Do not expose the electrical control enclosure to ambients above 140°F or below 32°F.
All wiring must be performed in accordance with the National Electric Code (NEC) or regulatory agency for the
installation locality.
2.6 CONTROL OPERATION
See the Mueller multi-stage chiller control manual (Part No. 8825582) for control operation.
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