All installations and services must be performed by qualified service personnel.
Figure 8
M. SETTING TEMPERATURE RISE
The
The blower motor is wired on low speed for heating mode of the
The blower motor is wired on medium low speed for heating mode of the
The temperature rise through the furnace may vary depending on the duct system, elevation, heating value, etc. for each installation.
After 10 to 15 minutes of continuous operation, the temperature rise through the
furnace must fall within a range of 55°F to 85°F. If the outlet or supply duct temperature is too high, check to make sure the return air filter is clean, the return air registers are free from obstruction, the outlet registers are properly adjusted and clear, and the supply and return air ducts are open.
The circulating air blower is not moving enough air if the supply air temperature is still too high. Before proceeding further, turn off the power supply to the furnace and remove the blower door. The speed of the blower must be increased by changing the speed tap from the motor (see wiring diagram). This is accomplished by locating the control panel attached to the blower housing and switching the blower lead, which should be connected to the “Heat” terminal on the
24
