Johnson Controls AV*(C) Series TXV Metering Devices, Refrigerant Line Connection

536636-UIM-D-1211

SUSPENSION SUPPORT LOCATIONS FOR HORIZONTAL APPLICATIONS

MIN. 3/8”

THREADED ROD

MIN. 1-1/2” x 1-1/2” Angle Recommended length 26” minimum with 2” clearance on both sides of Air Handler

		2					1-1/2
			WW			XX			YY
	Units						Dimension
(Nominal Tons)					WW					XX
	24B			20				46
	36C			24				52
AV*48D, 60D				28				57

FIGURE 8: Typical Horizontal Installation

TXV METERING DEVICES

If the model (C) number is of the following format: 4F, 4G, 4H, 4J, and 4K will have the coil with R410A TXV metering device installed at the factory.

If the model (C) number is of the 3X model series:

The coil will require an orifice or R410A TXV to be installed in the field. Refer to installation manual with TXV kit. It is recommended to install a orifice or TXV kit prior to brazing line sets.

VAPOR
LINE
THERMAL
EXPANSION
VALVE BULB	LIQUID
(Required insulation
	LINE
not shown for clarity)
	THERMAL
	EXPANSION
	VALVE
TXV
EQUALIZER
LINE	DISTRIBUTOR BODY
FIGURE 9: TXV

Please refer to Outdoor Unit Tech Guide to verify which metering device is installed in this coil and that this is a valid system match for the AC or HP unit installed.

The temperature sensing bulb is attached to the coil suction header line.

COIL UNDER PRESSURE.

Relieve pressure by depressing schrader core. Coil may have factory installed TXV or may require orifice or TXV to be added. See outdoor unit documentation for correct orifice or TXV to be used. Refer to coil nameplate for TXV identification for this unit.

NOTICE

The coil should be open to the air for no more than 2 minutes to keep moisture and contaminates from entering the system. If the coil can- not be installed into the refrigeration system in that time, the ends should be temporarily closed or plugged. For a short term delay, use masking tape over the ends of the copper tubing to close the tube to the air. For a longer term delay, use plugs or caps. There is no need to purge the coil if this procedure is followed.

REFRIGERANT LINE CONNECTION

Coil is under inert gas pressure. Relieve pressure from coil by depressing schrader core.

Dry nitrogen should always be supplied through the tubing while it is being brazed, because the temperature required is high enough to cause oxidation of the copper unless an inert atmosphere is provided. The flow of dry nitrogen should continue until the joint has cooled. Always use a pressure regulator and safety valve to insure that only low pressure dry nitrogen is introduced into the tubing. Only a small flow is necessary to displace air and prevent oxidation.

Connect lines as follows:

NOTICE

Route the refrigerant lines to the coil in a manner that will not obstruct service access to the coil, air handling system, or filter.

1.	Suction and liquid line connections are made outside the cabinet.
	Leave the tubing connection panel attached to the cabinet with the
	tubes protruding through it. Coil access panel should be removed
	for brazing. The lines are swedged to receive the field line set
	tubes.
2.	Cut the end of the suction tube using a tube cutter. Place the tube
	cutter as close as possible to the end of the tube to allow more
	space for the connection and brazing of the suction line.
3.	Remove the heat shield from the Customer Packet, soak in water,
	and install over coil tubing to prevent overheating of cabinet.
4.	Wrap a water soaked rag around the coil connection tubes inside
	the cabinet to avoid damaging the TXV bulb.

SCREW

NUT CLAMP

TXV BULB (Cover completely with insulation)

SUCTION LINE

5.	Remove grommets where tubes exit the cabinet to prevent burning
	them during brazing.
6.	Purge refrigerant lines with dry nitrogen. Follow outdoor unit braz-
	ing instructions.
7.	Braze the suction and liquid lines.
8.	Remove the heat shield.
9.	Re-attach the grommets to the lines carefully to prevent air leak-
	age.
10.	Attach the coil access panel to the cabinet.

FIGURE 10: Proper Bulb Location

Refer to Outdoor unit Installation Manual for evacuation, leak check and charging instructions.

Lines should be sound isolated by using appropriate hangers or strap- ping.

All evaporator coil connections are copper-to-copper and should be brazed with a phosphorous-copper alloy material such as Silfos-5 or equivalent. DO NOT use soft solder.

6 Johnson Controls Unitary Products