Hypertherm DuraChill 5 HP Air-Cooled Chiller For Hypertherm - Manual (Page 10)

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4.2.2 Reservoir Vent
A ¾ inch female NPT connection is provided at top of sight glass for the reservoir vent line. This vent is intended to
prevent siphoning and/or overflows in the event of a problem with process liquid circulation. The vent pipe should
extend to a height at least 6 to 12 inches (15.2 to 30.5 cm) above the process equipment. If desired you may fill the
chiller through vent fitting providing the reservoir cap is off to let air escape.
4.2.3 Reservoir Drain
A ¾ inch female NPT connection is provided at bottom of sight glass for the reservoir’s gravity drain. It should be
piped to a drain or receptacle positioned lower than the bottom of the reservoir. If a receptacle is used, be sure is of
sufficient volume to hold all the water in the reservoir, process, and process lines.
4.3 Reservoir Low Level Float Switch Alarm
This is designed to alert you when the fluid level in the Chiller’s reservoir drops too low
4.4 Fan
The Chiller’s fan may be allowed to exhaust freely into the area in which the unit is located or may be vented to an
exhaust duct of the appropriate size. If it is connected to an exhaust duct, the duct work should incorporate an
auxiliary blower to prevent back pressure from impacting fan operation.
4.5 Electrical Power
All electrical connections should be made by a qualified, licensed electrician. Proper building
codes and safety regulations should be followed.
4.5.1 Electrical Phase Requirements
The Chiller is designed with a junction box on the rear of the unit to connect the electrical power supply conduit. See
Figure 4-1.
Be sure to connect the wires in the proper phase sequence. i.e.: L1, L2 and L3. Provide suitable conduit strain relief
and grounding.
Your chiller is equipped with a phase monitor. It is located inside the controls enclosure. It will prevent startup if phase
connection is incorrect. It will also turn the chiller off in the event of a loss of one phase. It will also prevent chiller
operation if the voltage mismatch between any two phases is greater than 8%.
IMPORTANT: Do not turn Controller power On until the Chiller reservoir has been
filled. When Controller power is turned On, both pumps automatically begin pumping.
If the reservoir has not been filled, the pumps will be damaged.
4.5.2 Remote On / Off
This allows the user to turn the Chiller on and off using a 24 VDC input to turn unit on and removal or loss of 24 VDC
will turn the unit off and “Ec“ (External control) will be displayed in the “Temperature Display”. A mating plug for
connector on rear panel has been shipped with manual. A 3 conductor, 22 AWG Cable (Consolidated PN: 5401-CL,
Multi-Conductor Cable or equivalent) to be supplied by user. Connect terminals “1” and “2” to user supplied source of
24VDC. See Figure 4-1 and A.2 Wiring Diagram.
Make sure that the power supply to the Chiller is the same voltage, frequency, and phase as
indicated on the identification label.