York D2CG 072, D7CG 036, D7CG 048 Vent And Combustion Air Hoods, Optional Economizer Rain Hood

VENT AND COMBUSTION AIR HOODS

The vent and combustion air hoods are shipped attached to the blower housing in the blower compartment. These hoods must be installed on the outside of the gas heat access panel to ensure proper unit function. The necessary mounting screws are provided in a 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 three 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 Figure 5. Remove the protective label covering the opening just prior to installing this hood.

The vent hood (including its screen) is installed by inserting the top flange of the hood into the slotted opening in the access panel. The top screw secures the hood to the access panel. The remaining two side screws must be installed after the access panel is installed on the unit. These screws engage the bottom flue box flange.

CAUTION: All three screws in the vent hood must be properly installed before furnace operation to insure all com- bustion products are exhausted from the unit.

FIG. 5 - VENT AND COMBUSTION AIR HOODS

OPTIONAL ECONOMIZER RAIN HOOD

The following procedure should be used when assembling an economizer rain hood onto a unit. Refer to Figure 6. The outdoor and return air dampers, damper actuator, the linkage and all the controls are factory mounted as part of the economizer option.

All of the hood components, including the filters, the gasketing and the hardware for assembling are located above the top filter racks within the filter section. The outdoor air sensor is in the bag of parts located at the bottom of the return air section.

530.18-N8Y

1.With filter section access panel removed, take out hood components, filters and sensor described above. Remove and discard outdoor air opening cover on back unit (Upper right hand corner).

2.Remove the 1/2" knockout (A) in the units rear panel (located to the right side of the outdoor air opening). Insert the two loose wires from inside the unit, into the 1/2" bushing provided. Insert wires and bushing into knockout. Snap bushing into place.

3.Mount the outdoor air sensor to the rear panel, just below the knockout described in Step 2. Secure with two self-drilling screws at dimples (B) provided in the panel.

NOTE: Sensor must be positioned so that the sensing ports are at the top (louvers pointing downward) and terminal connections to the right.

4.Connect the two wires, indicated in Step 2, to the sensor as follows:

∙Wire #73 to terminal (+)

∙Wire #74 to terminal (S)

5.Assemble the LH and RH side plates to the top cover (2 screws each side) to form the hood. Apply gasketing to the flange surface on each side plate. Extend gasketing 1/4" beyond top and bottom of each flange to insure adequate corner sealing. Secure this assembly to the unit back panel (upper right hand corner). First, remove screw (C) on unit top cover. Then slip flange of hood cover in under flange of unit top cover, replace screw (C), engaging hole (E) in hood flange and tighten. Attach the two side plates to the unit panel by using two self-drilling screws for each side plate at dimples (D) provided in the panel.

6.Position fillpiece at bottom of hood, between the two side plates but do not secure at this time. (Slotted openings MUST be downward for drainage). After fillpiece is properly posi- tioned, note where contact is made with the unit panel. Re- move fillpiece and apply gasket material to this area to provide a seal. Reposition fillpiece and secure with 2 screws.

7.Install the two filters into the hood assembly, sliding down along retainers on side plates, into fillpiece at bottom of hood.

	OUTDOOR AIR
	OPENING COVER	C
	HOOD
FILTER	COVER
COVER	D			OUTDOOR AIR
	E
			D	SENSOR
GASKETED		A
	D
FLANGE			D	GASKET
	B

L. H. SIDE

PLATE

FILTER SECTION

	GASKETED	ACCESS PANEL
	FLANGE
FILTERS	R. H.	SIDE DUCT
		APPLICATION SHOWN
	SIDE
	PLATE

FILLPIECE

FIG. 6 - ECONOMIZER RAIN HOOD ASSEMBLY (OPTION)

Unitary Products Group 7