These heaters are located within the central compartment of the unit with the heater elements extending into the supply air chamber. Refer to Figure 7 for access panel location.
Fuses are supplied, where required, by the factory. Some KW sizes require fuses and others do not. Refer to Table 2 for minimum air flow limitations and to Table 8 for electrical data.
OPTIONAL ECONOMIZER / MOTORIZED DAMPER RAIN HOOD
The instructions for the optional economizer / motorized damper rain hood can be found in form
ENTHALPY SETPOINT ADJUSTMENT
Remove the economizer access panel from the unit to check the following adjustments. Loosen but do not remove the two panel latches.
CAUTION: Extreme care must be exercised in turning both the setpoint and minimum position adjusting screws to prevent twisting them off.
1.The enthapy set point for the dampers may now be set by selecting the desired setpoint shown in Figure 6. Adjust as follows:
•For single enthalpy operation, carefully turn the setpoint adjusting screw to the “A”, “B”, “C” or “D” setting corre- sponding to the lettered curve.
•For dual enthapy operation, carefully turn the setpoint adjusting screw fully clockwise past the “D” setting.
2.To check that the damper blades move smoothly without binding, carefully turn the minimum postion adjusting screw fully clockwise and then energize and
3.Replace the economizer access panel. Reposition the two latches horizontally and retighten the screws.
6 | Unitary Products Group |
