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3.1
PELLET CENTRAL PROCESSING UNIT (PELLET CPU)
On the Caddy Alterna furnace, a new electronic control was developed. This system is more polyvalent. All
connections are done from the the pellet central processing unit (Pellet CPU). 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 the pellet central processing unit (Pellet CPU) (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 the pellet central processing unit (Pellet CPU) 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 the pellet central processing unit (Pellet
CPU) 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 the pellet central processing unit (Pellet CPU) will vary the distribution
blower's speed in order to maintain the BEP inside the hot air plenum.
3.2
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 the pellet central
processing unit (Pellet CPU). It is an electronic fan limit. First, you must configure your pellet central processing unit
(Pellet CPU). During the start-up, the pellet central processing unit (Pellet CPU) will display some information such
as the name of the company as well as the version of the program.
3.3
MODES, OPTIONS, AND PROGRAMMING
Your pellet central processing unit (Pellet CPU) 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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