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PC BOARD #2 (SYSTEM CONFIGURATION)
On the Caddy Alterna furnace, a new electronic control was developed. This system is more polyvalent. All
connections are done from the PC board #2. There are connector ports available for all components and options.
Under the HEAT mode, a logic was developed to provide you with the best comfort and efficiency.When you are
heating with pellets, the distribution blower starts at speed #1 based on a preselected temperature programmed into
the PC board #2 (this temperature is called the KIP – Kick-in Point). The temperature is read by the RTD probe
located inside the hot air plenum. As the temperature continues to rise inside the hot air plenum, the PC board #2
changes the speed of the blower to speed #2. This speed should maintain the most efficient temperature (BEP –
Best Efficiency Point) inside the hot air plenum. If the optional electrical unit provides the heat, the BEP is set at
145F. Whenever the temperature inside the hot air plenum continues to rise above the BEP, the PC board #2
selects a higher speed in order to stabilize the temperature into the ducting system and therefore maintain the BEP.
In the case of the electrical option, the blower starts as soon as that there is a request for heat from the option's
thermostat. In other words, for security reasons, the distribution blower does not wait for a minimum temperature to
be reached inside the hot air plenum before starting. However, the rest of the logic remains the same. That is, for
as long as there is a heat demand, the PC board #2 will vary the distribution blower's speed in order to maintain the
BEP inside the hot air plenum.
FIRST USE – GENERAL INFORMATION
The RTD probe reads the temperature inside the hot air plenum and plays the same role as a mechanical fan limit
control found on most conventional furnaces. The main difference is that the RTD is connected to a PC board #2. It
is an electronic fan limit. First, you must configure your PC board #2. During the start-up, the PC board #2 will
display some information such as the name of the company as well as the version of the program.
MODES, OPTIONS, AND PROGRAMMING
Your PC board #2 is equipped with four operating modes: HEAT (automatic heating), COOL (air conditioning), CIRC
(recirculation), and MANU (manual heating). You can pass from one mode to the other by pressing on the arrows
buttons. For each mode, some selections are available. A definition is provided below (see: "The Selections").
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