Coolpak PCA050, Operation Manual

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Process Water Bypass
All PCA chillers have an internal bypass device (patent pending). If the process flow becomes
blocked during chiller operation, this component allows water to flow through the chiller. This
protects the chiller from freeze-up, excessive pressures, and pump damage, and allows other safety
features to remain effective.
2-3 PCA Condenser Air Supply
PCA chillers use the surrounding air to cool the condenser.

Condenser air entering the PCA unit should be at least 65°F (18°C). Operation with air below
65°F (18°C) can cause the low pressure cut-out to shut down the chiller due to the low
refrigerant pressure.

Install the chiller in an area where there is free passage of air for condensing.

Provide 18" (46 cm) or more clearance for the chiller's air intake.

Make provisions to exhaust the heated air discharged from the chiller.

Do not put the PCA unit where steam, hot air or fume exhausts will be drawn into the
condenser.

Air-cooled condensers must be cleaned frequently. Neglect reduces capacity, increases
operating costs, and leads to possible chiller failure. See Chapter 7 on Page 29 for cleaning
instructions.

Normal condensing pressure with 95°F (35°C) air is approximately 1.241Bar for the PCA050
and PCA100; 1.897 Bar for the PCA150.
PCA Ambient Temperature Ranges
Ambient Temperature Range Minimum Temperature Maximum Temperature
Operation 18°C 38°C
Storage 4°C 49°C
2-4 Water Reservoir
During start-up and when additional solution is required, see Figure 6 on page 16 for the
recommended ethylene glycol/water solution. This chart shows the proportions needed to provide
freeze protection to 7°C below the desired process set point.

Add a pre-mixed solution to provide freeze protection to a temperature 7°C below the normal
operating temperature of the chiller.

Use industrial quality ( not automotive) ethylene glycol.