An apparatus for controlling the operation of a HVAC system, where the apparatus
is adapted to be releasably connectable to a thermostat sub-base assembly connected
to an HVAC system. The apparatus is configured to be releasably connectable to
the connector pins in a manner such that the apparatus may be slid onto the sub-base
and easily removed without any disconnection of wiring. After completion of all
construction, the apparatus may be removed and saved for future use, and a new
digital thermostat may then be slid onto the connector pins of the sub-base.
