OPTI TEMP OTC-3.0A - High Refrigerant Pressure Switch; Low Refrigerant Pressure Switch; Freezestat

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Solenoid Valve
The solenoid valve is controlled by the microprocessor based PID temperature controller and
supplies adequate amount of refrigerant necessary to cool the process fluid to the desired
temperature.
Reservoir
The reservoir material will vary depending upon the materials of construction option selected.
There is a removable cover on the top of the reservoir. During chiller operation the reservoir
should be at least half full. For most installations the reservoir has sufficient capacity to
handle coolant drain back from the process equipment which occurs during chiller shut down.
For installations with overhead piping special precautions will have to be made during
installation. Contact OPTI TEMP customer service department for details at 231-946-2931 or
information@optitemp.com
.
NOTE: The reservoir must not be pressurized. Modifications to the chiller that would result in
pressurization of the reservoir will void the warranty.
Coolant Pump
The standard close coupled pump is typically equipped with a mechanical seal. Material of
construction and seal type will vary by model and the options selected. The pump is factory
tested for the specified operating conditions and meets NEMA specifications / industry
standards.
High Refrigerant Pressure Switch
The High Refrigerant Pressure switch is designed to limit the compressor discharge pressure
within the design parameters of the compressor. The switch is located on the discharge side
of the compressor. All models feature automatic reset switches.
Low Refrigerant Pressure Switch
The Low Refrigerant Pressure switch is designed to limit the compressor suction pressure to
within the designed parameters of the compressor. The switch is located in the suction side
of the compressor. The low pressure refrigerant switch is an automatic reset switch.
Freezestat
The freezestat control is an electronic thermostat most commonly used that senses the
coolant temperature separately from the microprocessor based PID temperature controller.
The PID controller is sometimes used as the freezestat. This safety is designed to limit the
temperature of the coolant leaving the evaporator and prevent a possible freeze up situation.
This control should be set 10°F (5°C) below the minimum coolant supply temperature, and
there should be a sufficient glycol concentration for 10°F (5°C) below the freezestat setting.
NOTE: It is critical that the freezestat is set properly and that there is sufficient glycol in the
system to correspond with the freezestat setting. Freeze ups can cause extensive damage to
several components in the chiller, and the warranty does not cover repairs required due to a
freeze up.