Installation Instructions

Document No. 553-087
Installation Instructions
August 15, 2006
Page 2 of 4 Siemens Building Technologies, Inc.
NOTE: The PXC Compact with extended
temperature range option may use the 115V
or 230V MEC Service Box or any 24 Vac
Class 2 transformer.
For more information on the service box,
see the MEC Service Box Installation
Instructions (586-135).
CE Compliance Requirements
For installations requiring CE compliance, the PXC
Compact must be installed inside a metal enclosure
rated at IP20 minimum.
See the APOGEE Wiring Guidelines for Field Panels
and Equipment Controllers (125-3002) for CE
compliance wiring requirements.
Energy Management Applications
For energy management only (low voltage (Class 2)
and non-smoke control applications), you may
mount the PXC Compact on a flat surface.
NOTE: Use an enclosure if the operating
environment exceeds the environmental
ratings of the PXC Compact. For example,
an environment where the controller may be
directly exposed to water.
Outdoor Applications
For outdoor applications, mount the rooftop PXC
Compact inside a NEMA-4 rated enclosure or a
similarly protected environment.
Applications Requiring a Secure
Enclosure
For any application requiring a secure enclosure,
mount the PXC Compact inside a listed enclosure
along with the MEC Service Box and Sidewall Kit, if
needed.
CAUTION:
UL Listings require that NEC Class I and
Class II wiring be kept separate from each
other. Use separate conduit and cable tie
bars inside the enclosure to separate Class I
DO wires from all other Class II wiring.
Installation
The PXC Compact can be mounted either vertically
(with 24 Vac and DOs on the right) or horizontally
(with 24 Vac and DOs at the top).
NOTE: Always fasten the PXC Compact at four
points so that the controller remains
securely fastened when point connectors
are removed.
1. Select one of the following options for fastening
the PXC Compact:
• Connect the controller to a DIN rail by using
the four slide-out mounting tabs (see
Figure 1).
• Drive screws through the four slide-out
mounting tabs (see Figure 2).
• Drive screws through the two mounting
holes in the controller cover and through two
mounting tabs at the opposite corners
(see Figure 2).
2. Gently slide out the mounting tabs (see
Figure 1).
NOTE: Do not force the tabs to extend
beyond the screw holes! If you need
to reinsert one of the mounting tabs,
see the PXC Owner’s Manual (553-
104) for instructions.
PXC0006R1
DIN Rail
Channel
Slide-out
Mounting Tabs
Figure 1. Back View of the PXC Compact.