GENERAL DESCRIPTION
Page 2-2
REFRIGERATION/HEATING COMPONENTS
A. Refrigeration
MC-Series chambers have a cascade mechanical refrigeration system. The cascade system for a
MCB-1.2 and the MC-3 (230V and 400V) have an ultimate low temperature of -94ºF (-70ºC) and
the MC-3 (115V) has an ultimate low temperature of -85°F (-65°C). The MCB single stage has a
temperature range of -22°F (-30ºC) to +375°F (+190ºC). There are some options that will affect
ultimate low temperature. The cascade system uses refrigerant R-404A in System #1 and R-508B
in System #2. The refrigeration system is air cooled. The ambient around the unit should not exceed
80ºF (26.7ºC) for proper operation. Ultimate low temperatures will vary with ambient conditions.
All refrigeration components are selected to ensure safe, reliable, and balanced operation. The
components may be purchased from the CSZ Service Department or a local refrigeration wholesaler.
B. Heater
Open-coil nichrome heating elements are standard on all systems. The heaters are mounted in
porcelain insulators attached to stainless steel frames. The heaters are located in the plenum area
and do not radiate directly into the test space.
HUMIDITY (OPTIONAL)
The MCBH-1.2 and the MCH-3 Series chambers provide the same temperature ranges for heating and
cooling as the MCB-1.2 and the MC-3 Series, but add the ability to control humidity within the range of 10% to
95% relative humidity as limited by a +185°F (+85°C) dry bulb temperature and a +45°F (+7°C) dewpoint. The
MCBH-1.2 and the MCH-3 both use a steam generator.
***In some instances and at certain setpoints, the PID parameters in the controller can be changed to achieve
better control in humidity mode. Please see Chapter 4 and the controller manual for instructions on
how to edit PID’s.
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