Ductwork, Ground Level -- Horizontal Units

INSTALLATION

GROUND LEVEL -- HORIZONTAL UNITS

For ground level installations, the unit should be positioned on a pad the size of the unit or larger. The unit must be level on the pad. The pad must not come in contact with the structure (See Figure 11.) Be sure the outdoor portion of the supply and return air ducts are as short as possible.

Proceed with the installation as follows:

1.Place the unit on the pad and the five (5) rubber isolators provided.

2.Attach the supply and return air ducts to the unit.

3.Insulate any ductwork outside of the structure with at least 2 inches of insulation and weatherproof. There must be a weath- erproof seal where the duct enters the structure.

4.Complete the installation according to the instructions in the following sections of this manual.

q	TYPICAL GROUND LEVEL APPLICATION
q		(WCY024-060G MODELS)
		(WCY024-060G MODELS)
				OUTDOOR AIR
				DISCHARGE
		SUPPLY AIR
	RETURN AIR	DUCT
	DUCT
SIDING
				OUTDOOR AIR
				INTAKE
				SUPPORT PAD
				FOUNDATION
EXTERIOR
WALL
	INSULATE	FLEXIBLE DUCT	ISOLATORS
	WEATHERPROOF	FLEXIBLE DUCT	ISOLATORS
	WEATHERPROOF	CONNECTORS	(1 PER CORNER
	OR RAIN SHIELD	CONNECTORS	(1 PER CORNER
	OR RAIN SHIELD		AND 1 UNDER
			UNIT CONTROL BOX)	2046.eps

DUCTWORK

ATTACHING DOWNFLOW DUCTWORK TO ROOF CURB

Supply and return air flanges are provided on the roof curb for easy duct installation. All ductwork must be run and attached to the curb before the unit is set into place.

Follow these guidelines for ductwork construction:

Connections to the unit should be made with three-inch canvas connectors to minimize noise and vibration transmission.

Elbows with turning vanes or splitters are recommended to mini- mize air noise and resistance.

The first elbow in the ductwork leaving the unit should be no closer than two feet from the unit, to minimize noise and resistance.

ATTACHING HORIZONTAL DUCTWORK TO UNIT

All conditioned air ductwork should be insulated to minimize heat- ing and cooling duct losses. Use a minimum of two (2) inches of insulation with a vapor barrier. The outside ductwork must be weatherproofed between the unit and the building.

When attaching ductwork to a horizontal unit, provide a flexible watertight connection to prevent noise transmission from the unit to the ducts. The flexible connection must be indoors and made out of heavy canvas.

NOTE: Do not draw the canvas taut between the solid ducts.

Page 10

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