Carrier 09BY006-024 DIMENSIONS in, Ð Condenser Ductwork Details, 111¤8, 171¤8, 411¤8, 481¤4

CHECK VALVE Ð When the 09BY condenser is installed with the condenser located above the compressor evapora- tor, it is recommended that a ®eld-supplied check valve be installed on the hot gas discharge line. This prevents refrig- erant which condenses in the discharge line during the off cycle from draining back into the compressor. Install the check valve at the compressor line before the line goes up to the condenser. Check valve part no. EC37BP183 or similar may be used.

SERVICE VALVES Ð Service valves are not factory in- stalled on the 09BY units. If isolation of the refrigerant charge in the condenser from the unit or the piping system is de- sired, it is recommended that ®eld-supplied service valves be installed in the discharge and liquid line inside the 09BY condenser. A Schrader port connection is also recommended on the liquid and discharge line at the condenser for ease in troubleshooting when the condenser is located out of sight from the compressor evaporator unit.

Step 6 Ð Ductwork Ð The 09BY unit is designed for use either with or without ductwork or rain louvers. If either is used, care must be taken to eliminate air recirculation. Re- circulation can be minimized by blocking the front dis- charge and discharging through an extension elbow. When properly designed, hinged discharge louvers can be applied to ductwork and to the condenser air discharge. Fixed rain louvers over discharge outlets can cause excessive recircu- lation and nuisance high-pressure switch cutouts. Obstruc- tions closer than 10 ft to the discharge air pattern can cause signi®cant recirculation. See Fig. 9 for ductwork installation to prevent recirculation of air.

If ductwork is used from standard discharge openings and another bird screen is provided, remove factory-supplied screen to reduce static pressure loss. Units 09BY006-014 have a factory-installed ¯ange to connect ductwork to the con- denser air inlet. Units 09BY016 and 024 are provided with ¯anges taped inside the unit for shipping. To attach the duct to the unit inlet, mount the ¯ange by removing the screws that hold the condenser coil. Insert the ¯ange and replace the screws. See Fig. 10. Take care not to puncture the coil when removing and installing screws.

CONDENSER AIR DUCT INSULATION Ð The con- denser air duct must be insulated on indoor installations to prevent moisture condensation on the unit panels during cold weather. Insulate as follows:

1.If metal ductwork is used, insulation may be applied on the inside of the duct. This installation should be ex- tended to cover the inside of the 09BY duct ¯anges.

It is necessary to insulate the inside of the ducts at the duct ¯anges to reduce heat loss from the metal cabinet by conduction through the duct ¯anges and into the cold duct. Interior insulation allows the metal duct to approach room temperature. It also prevents condensation from forming and collecting under the insulation which will occur with exterior duct insulation.

NOTE: Fiberglass duct board may also be used if per- mitted by local codes.

2.If insulation is applied to the outside of the metal duct, the inside must be insulated for a length of 10 in. from the unit (including the duct ¯anges) or up to the ¯exible duct vapor barrier on the outside, which must be tightly sealed to prevent condensation under the insulation.

DIMENSIONS (in.)

UNIT	A	B	C	D	E	F	G
09BY
006	24	111¤8	6	171¤8	161¤8	223¤8	411¤8
008	24	14	6	20	161¤8	267¤8	481¤4
012	24	14	6	20	161¤8	267¤8	555¤8
014	30	14	6	20	303¤8	267¤8	631¤4
016	30	20	6	26	303¤8	363¤8	859¤16
024	30	20	6	26	303¤8	367¤8	857¤16

Fig. 9 Ð Condenser Ductwork Details

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