Johnson Controls AV*(C) Series Duct Connections, Duct Work Transition, AIR Filters

536636-UIM-D-1211

FEEDER

TUBES

CONDENSATE

DEFLECTOR

S-CLIPS ON HORIZONTAL PAN

FIGURE 5: Condensate Deflecctor on Horizontal Drain Pan Edge

DEFLECTOR

DRAIN PAN

WALL

S-CLIP

FIGURE 6: S-Clip Installation

DUCT CONNECTIONS

Use 1/2" screws to connect ductwork to bottom of unit. Longer screws will pierce the drain pan and cause leakage. If pilot holes are drilled, drill only though field duct and unit bottom flange.

Air supply and return may be handled in one of several ways best suited to the installation. See Figure 3 for dimensions for duct inlet and outlet connections.

The vast majority of problems encountered with combination heating and cooling systems can be linked to improperly designed or installed duct systems. It is therefore highly important to the success of an instal- lation that the duct system be properly designed and installed.

Use flexible duct collars to minimize the transmission of vibration/noise into the conditioned space. If electric heat is used, non-flammable material must be used.

Where return air duct is short, or where sound may be a problem, sound absorbing glass fiber should be used inside the duct. Insulation of duct work is a must where it runs through an unheated space during the heating season or through an uncooled space during the cooling season. The use of a vapor barrier is recommended to prevent absorp- tion of moisture from the surrounding air into the insulation.

The supply air duct should be properly sized by use of a transition to match unit opening. All ducts should be suspended using flexible hang-

ers and never fastened directly to the structure. This unit is not designed for non-ducted (freeblow) applications. Size outlet plenum or transition to discharge opening sizes shown in Figure 3.

Duct work should be fabricated and installed in accordance with local and/or national codes. This includes the standards of the National Fire Protection Association for Installation of Air-Conditioning and Ventilat- ing Systems, NFPA No. 90B.

DUCT WORK TRANSITION

Duct work that is not designed to match the supply air opening can cause turbulence inside the plenum box. This turbulence can change the air flow patterns across the heat kit limit switch. If the factory sug- gested transition can not be fabricated, it is recommended a block off plate (approximately 8” in height and running the full width of the ple- num) be attached to the supply opening Please refer to Figure 7 as a visual aid. The use of this block off plate will keep better air circulation across the limit switch.

RECOMMENDED	SUGGESTED LOCATION
TRANSITION
	OF BLOCK OFF PLATE

FIGURE 7: Duck Work Transition

The above suggestions will not alleviate problems caused by improper installation. When receiving intermittent fault codes pertaining to the limit switch, always double check your airflow CFM, motor speed and static pressures.

AIR FILTERS

Air filters must be field supplied. A 1" filter access rack has been built into the unit. See Figure 3. Remove filter access cover shown. Install proper size filter. Standard 1" size permanent or throw away filter may be used, or, permanent washable filters are available using model num- bers: 1PF0601, 602, 603BK. See Table 8 for filter size.

Equipment should never be operated without filters.

HORIZONTAL SUSPENSION (AV ONLY)

For suspension of these units in horizontal applications, it is recom- mended to use angle steel support brackets with threaded rods, sup- porting the units from the bottom, at the locations shown in Figure 8.

When an evaporator coil is installed in an attic or above a finished ceil- ing, an auxiliary drain pan should be provided under the air handler as is specified by most local building codes.

Johnson Controls Unitary Products 5