York D2CE, D2CG300 VENT AND COMBUSTION AIR HOODS DCG Models, Vent And Combustion Air Hoods

530.18-N11Y

VENT AND COMBUSTION AIR HOODS (DCG Models)

Two vent hoods and a combustion air hood (with screens) are shipped attached to the blower housing in the blower compartment. 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 to the inside of the access panel opening with four fasteners and the screws used for mounting the hood to the panel. The top flange of this hood slips in under the top of the access panel opening when installing. Refer to the Vent and Combustion Hood figure.

Each vent hood is installed by inserting the top flange of the hood into the slotted opening in the access panel and securing in place.

	SLOTTED
VENT AIR	OPENINGS IN
	ACCESS PANEL
OUTLET
HOODS

COMBUSTION AIR INTAKE

HOOD

GAS HEAT

ACCESS

PANELS

FIG. 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 44-320-2. Use these instructions when field assembling an economizer rain hood onto a unit. 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.

CAUTION: 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 the Enthalpy figure. Adjust as follows:

•For a single enthalpy operation, carefully turn the set point adjusting screw to the “A”, “B”, “C” or “D” setting corresponding to the lettered curve.

•For a dual enthalpy operation, carefully turn the set point adjusting screw fully clockwise past the “D” setting.

2.To check that the damper blades move smoothly without binding, carefully turn the minimum position adjusting screw fully clockwise and then energize and de-energize terminals “R” to “G”. With terminals “R” to “G” energized, turn the minimum position screw counterclockwise until the desired minimum position has been attained.

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 44-320-10. The exhaust fan, all supporting brackets, angles, and the wiring are factory installed as part of the power exhaust option.

All of the components, including the dampers, hardware, and mounting instructions are shipped in a single package external from the unit. The hood must be field assembled and installed.

Power exhaust is not available as a field installed option.

8 Unitary Products Group