Check all connections for leaks when piping is completed, using a soap solution. NEVER USE A FLAME.
VENT AND COMBUSTION AIR HOODS
Two vent hoods and a combustion air hood (with screens) are shipped attached to the blower housing in the blower com- partment. These hoods must be installed to assure proper unit function. All hoods must be fastened to the outside of the gas heat access panel with the screws provided in the bag also attached to the blower housing.
The screen for the combustion air intake hood is secured as shown on the label attached to the hood. The top flange of this hood slips in under the top of the access panel opening when installing. Refer to Figure 8.
Each vent hood is installed by inserting the top flange of the hood into the slotted opening in the access panel and secur- ing in place.
The outdoor and return air dampers, the damper actuator, the damper linkage, the outdoor and return air divider baffles, and all the control sensors are factory mounted as part of the Factory installed economizer option.
ENTHALPY SET POINT ADJUSTMENT
Remove the economizer access panel from the unit to check the following adjustments. Loosen but do not remove the two
panel latches.
Extreme care must be exercised in turning both the setpoint and minimum position adjusting screws to prevent twisting them off.
1.The enthalpy set point may now be set by selecting the desired setpoint shown in Figure 9. Adjust as follows:
•For a single enthalpy operation, carefully turn the set point adjusting screw to the A, B, C or D setting corre- sponding to the lettered curve.
•For a dual enthalpy operation, carefully turn the set point adjusting screw fully clockwise past the D setting.
VENT AIR
OUTLET
HOODS
COMBUSTION AIR INTAKE HOOD
SLOTTED OPENINGS IN ACCESS PANEL
GAS HEAT
ACCESS
PANELS
2.To check that the damper blades move smoothly without binding, carefully turn the minimum position adjusting screw fully clockwise and then energize and
3.Replace the economizer access panel. Reposition the two latches horizontally and retighten the screws.
POWER EXHAUST/BAROMETRIC RELIEF DAMPER AND RAIN HOOD OPTION
The instructions for the power exhaust/barometric relief damper and rain hood can be found in form
FIGURE 8 : VENT AND COMBUSTION AIR HOODS
OPTIONAL ECONOMIZER/MOTORIZED DAMPER RAIN HOOD
The instruction for the optional economizer/motorized damper rain hood can be found in form
All of the components, including the dampers, hardware, and mounting instructions are shipped in a single package exter- nal from the unit. The hood must be field assembled and installed.
Power exhaust is not available as a field installed option.
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