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2012-2015 Reliable Controls Corporation
INSTALLATION PROCEDURE
USER GUIDE
INSTALLATION
SMART-SPACE CONTROLLER
™
TERMINATING THE CONTROLLER
Prior to terminating any wiring, ensure that all power is disconnected. Accidentally
touching the controller circuit board with a live wire can cause serious damage.
Termination is most easily accomplished with the terminal strips removed from the
controller head. On new construction projects, it may be convenient to detach the
terminals, terminate the field wiring, then tuck loose wire and terminal strips into the
electrical box until wall construction and painting is complete. The terminal strips can be
attached to the controller head during final commissioning.
FIGURE 14: TERMINATING WITH TERMINALS DETACHED
POWER WIRING
The SSC and SSCE each consume 10 VA from a Class 2, 24 VAC transformer or 24 VDC
power supply. The SSCP consumes up to 65 VA, with all 4 relay outputs powering external
loads.
Beginning with Revision C SSC hardware (shipped after Jan 1, 2012), the SSC EIA-485
transceiver uses the COM power terminal as its voltage reference. Therefore the return
wire from the COM terminal to the transformer must be connected to earth ground. SSC
hardware Revisions A and B can also have the return wire to the transformer grounded for
safety reasons, however the EIA-485 for those SSCs do not use the COM terminal as an
EIA-485 reference, they use the REF terminals instead.
If power is taken from a transformer located in a packaged HVAC unit, the SMART-Space
Controller must be isolated from noise generated from contactors and motors. Install a
Reliable Controls PLF-2 power filter to isolate the controller from electrical noise on the
power wires.
All Reliable Controls controllers must have the return wire to the 24 VAC transformer
connected to Earth ground for proper EIA-485 communications.
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