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5.4 System Construction Standards
OPTI TEMP standard chillers are designed with NEMA 1 construction suitable for indoor use.
Unless the unit was specifically ordered with NEMA 4 construction for outdoor duty, it should
not be installed or stored in an outdoor location.
Section 6 – Installation
6.1 Chiller Location
The OPTI TEMP units utilize air-cooled refrigeration systems and must be placed in well
ventilated areas only. Air is drawn and/or discharged through the front, rear, side and top
panels of the unit. The unit must be located so the intake and discharge air is not restricted.
A minimum clearance of “one width” of the unit is suggested on all vented sides. Failure to
provide adequate ventilation may cause a reduction in cooling capacity, excessively high
refrigeration pressures, and/or pre-mature failure.
Never place the unit in a location where excessive heat, moisture, airborne oils, or corrosive
materials are present. The unit should be periodically cleaned to insure optimum
performance. A regular maintenance schedule based on operating conditions is
recommended. Please reference Section 8 of this manual for more information. Please note
that oil, dust, and/or other airborne agents can build up on air-cooled condensers resulting in
a decrease in performance or system failure.
NOTE: Serviceability was a primary concern when designing your portable chiller.
Removable panels permit easy access for periodic maintenance or repair. Do not
compromise this feature by locating the chiller in an inaccessible area.
NOTE: The condenser air inlet temperature should be maintained above 60°F (15°C) in order
to avoid possible low refrigerant pressure safety trips during start-up. If it is necessary to
store the chiller in an unheated area when not in use, be sure that all water is drained or that
an adequate amount of antifreeze is added to prevent freeze-up of the unit.
6.2 Process Fluid Connection
Connect “TO PROCESS” and “FROM PROCESS” connections on rear of chiller to your
process lines. Standard process connections provided on OTC Series chillers are stainless
steel male pipe fittings. See specifications table in Section 5.2 for connection sizes on
specific chiller models. It is suggested that valves be installed on the “TO PROCESS” line
and “FROM PROCESS” line at the OPTI TEMP unit to be used as balancing valves and to
isolate the chiller should maintenance be required on the unit.
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