The Speeds; System Balancing; Heat Mode (Automatic Heating) - PSG MAX CADDY Installation And Operating Instructions Manual

4.5.1 The speeds

Your furnace is equipped with a 4-speed blower. Using the PC board, we have created 6 functional speeds. Refer to
Table 2 below for the various speed configurations.
*These results were measured at exit of plenum during laboratory tests. Results may vary depending of the

4.5.2 System Balancing

It is important to call upon a professional installer for the installation of the furnace and the ducting system
configuration. Certain check-ups must be performed and certain rules must be respected in order not to damage the
blower. When all components are installed on the furnace and the ducting system is connected to the various rooms
of the house, you must balance the ducting system. In order to do so, start the furnace blower by selecting the
recirculation mode (CIRC). Then, in the FAN section, use the arrows to select speed #4 (refer to Table 2). It is
important to respect the velocity in the main duct, the secondary ducts, as well as the velocity at the room outlets.
The static pressure of your system must be adjusted to at least 0.2 IN.W.C. and must not exceed 0.5 IN.W.C.
Finally, make sure that you never exceed the maximum blower motor full load amperage.

4.5.3 HEAT Mode (automatic heating)

Operation
When the temperature in your house is below the value at which your wall thermostat is programmed, a signal is
sent to your furnace through the PC board, activating the motorized damper located in front of the furnace and thus
allowing more oxygen to the fire. The RTD temperature probe, located inside the hot air plenum of your furnace,
reads the plenum temperature continuously. When the temperature reaches the start-up value selected by the user
(KIP – Kick-in Point), the distribution blower starts functioning at the minimum speed. Thereafter, the blower
increments its speed until it reaches the best efficiency point (BEP) determined by the manufacturer. If the
temperature inside the hot air plenum exceeds the limit determined by the manufacturer, the blower automatically
selects the maximal speed and the motorized damper closes in order to slow down combustion. When the
temperature returns to a safe level, the blower speed gradually returns to the speed required to maintain the BEP.
Programming
Make sure that your wall thermostat is well connected to the PC board. Make sure that the right port has been
selected based on the type of thermostat (e.g. 24VAC or Millivolt).
In the MODE menu, select HEAT by pushing the SELECT button. Then, using the arrows buttons, choose from the
different selections: KIP, TEMP, or UNIT. Consult the "Selections" section in order to obtain a complete definition
of the terms KIP, TEMP, and UNIT.
Table 2 – The Speeds
Speed Corresponding data
1 Blower speed #1 using 98V
2 Blower speed #1 using 115V 760
3 Blower speed #2 using 98V
4 Blower speed #2 using 115V 950
5 Blower speed #3 using 115V 1150
6 Blower speed #4 using 115V
configuration and installation.
32
CFM* Static pressure
600 0.2'' H O
2
0.2'' H O
2
840 0.2'' H O
2
0.2'' H O
2
0.2'' H O
2
1260 0.2'' H O
2