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The PELLET / ELECTRIC combination model uses two thermostats: one thermostat controls the electric heating,
and the other one controls the pellet heating. When the call for heat cannot be satisfied by pellet heating, the
electrical element will automatically take over to maintain the house at the temperature set on the electrical
o
o
element's thermostat. Therefore, under normal bi-energy use, you should set the pellet system thermostat 2
to 4
higher than the electric system thermostat; the bigger the gap, the more the pellet heating will contribute to the
overall heating needs.
THERMOSTAT (S)
Pellet furnace only
The thermostat must be installed on an inside wall and located where it is not likely to be affected by the draft
coming from an air outlet. It must be installed at a minimum of 55 inches above the floor.
Combination pellet-electric
The combination model uses two thermostats which must be located at the same height from the floor. If the main
thermostat (pellet) calls for heat and that demand is not satisfied with the energy supplied by the pellet, the optional
heating unit (electrical element) will take over and will maintain the home's temperature at the setting programmed
on the second thermostat (e.g. the option's thermostat). The main thermostat must be connected to the "WOOD
MECH" port on the PC board. The electric option's thermostat must be connected to the "USER MECH" port on the
PC board. The "WOOD24VAC" & "USER24VAC" ports are only necessary when connecting an external appliance
that shares the furnace blower (example : AC, heat pump).
FAN CONTROL
We recommend that the HEAT mode be programmed for the Caddy Alterna (this is done with the PC board #2).
Under the HEAT mode, the distribution blower uses various speeds that are controlled by the PC board #2 based on
the hot air plenum temperature.
The plenum temperature is read by the RTD temperature probe. The
manufacturer's programmed settings should provide the most efficient operation for a majority of installations. The
PC board #2 also has a manual mode ("MANU" – consult the MODES section of this manual). Under the manual
mode, the Caddy Alterna operates as a conventional furnace. That is, the distribution blower starts at the speed
programmed in the PC board #2 (one single speed) based on only one temperature point read by the RTD probe
inside the hot air plenum.
The adjustment of all controls must be performed by a qualified technician. In order to obtain a continuous air
circulation during summer, you simply need to change the PC board #2 modes to "CIRC".
To do so, consult the
MODES section of this manual.
It is not recommended to let the blower run on the continuous mode when heating with pellet since the
pellet furnace must reach a certain temperature before the blower starts in order to operate efficiently.
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