Closed Loop Cooling System (AC Unit) Z23x Enclosures
Introduction
When it becomes necessary to have a lower internal temperature than the external ambient temperature around
the enclosure, then an air conditioner (AC unit) is required. The AC unit will result in an increase in the average heat
dissipation of a Z23 enclosure and therefore it may allow more equipment to be deployed. The T15 AC unit can be
used with or without a power shield and provides 30 CFM of 75°F air to cool the equipment inside the enclosure.
Figure 12 provides the T15 cutout dimensions required to externally mount it on a Z23 enclosure. The unit should
be mounted on the hinge side of the enclosure (figure 13). Figures 14 and 15 provide additional aids in locating
the cutouts on a Z23 enclosure.
Recommendations for Closed Loop (with AC Units) Z23x
1. Follow vendor recommendations for minimum clearances around active equipment (e.g. 2" for convection
cooled switches).
2. Read the instruction manual available from the vendor for the T15 AC Unit. A hyperlink to the manual is provided
at the end of this document.
3. Follow vendor recommendations for minimum clearances around exterior of the AC unit.
4. Mount equipment with lower operating temperatures on the lower DIN rails.
5. When possible stagger switches to avoid placing a switch directly below another switch as the lower switch can
increase the air temperature significantly for the upper switch.
6. The graph following (figure 11) provides a heat dissipation guide for a Panduit Z23 enclosure with a T15 air conditioner.
7. For outdoor deployments a 150-watt heater will increase the internal temperature of a Panduit Z23 enclosure by
15 °C above the external ambient temperature. Depending on ambient conditions and equipment specifications
an additional heater may be required. Outdoor models of the T15 unit include a 150-watt heater.
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