HP QuarterHorse Series 0.25 hp Portable Chiller PS-025 - Manual (Page 12)

Page 12 PS QuarterHorse Series Chillers
Process Water Bypass
All PS chillers have an internal bypass device. 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 PS Condenser Air Supply
PS chillers use the surrounding air to cool the condenser.
; Condenser air entering the PS unit should be at least 65 °F (18°C). Operation
with air below 65 °F (18°C) can cause the chiller to have 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 PS 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 6 on Page 21 for cleaning instructions.
; Normal condensing pressure with 95 °F (35°C) air is approximately 180 psi
(1,241 kPa).
PS Ambient Temperature Ranges
Ambient temperature range Minimum temperature Maximum temperature
Operation 65°F (18°C) 100°F (38°C)
Storage 40°F (4°C) 120°F (49°C)
2-4 Water Reservoir
During startup and when additional solution is required, see Figure 3 on Page 14 for the
recommended ethylene glycol/water solution. This chart shows the proportions needed
to provide freeze protection to 20
°F/11°C below the desired process set point.
; Add a pre-mixed solution to provide freeze protection to a temperature 20 °
F/11 °C below the normal operating temperature of the chiller.
; Use industrial quality (not automotive) ethylene glycol.
; A corrosion inhibitor suitable for the materials in the system should be
added to the glycol/water solution.