Carrier 38TDB instruction manual → FAN Coil, LONG-LINE Applications, Make Piping Connections

COIL

SENSING

BULB

EQUALIZER

TUBE

	THERMOSTATIC
	EXPANSION
	VALVE
	A91277
→	Fig. 4—TXV Installed
	8. Install vapor elbow (see Fig. 5B) with equalizer adapter to
	suction tube of line set and suction connection to indoor coil.
	Adapter has a 1/4-in. male connector or attaching equalizer	→
	tube.

9.Connect equalizer tube of TXV to 1/4-in. equalizer fitting on vapor line adapter.

10.Attach TXV bulb to horizontal section of suction line using bulb straps provided. (See Fig. 5C.) Insulate bulb with factory-supplied insulation tape. (See Fig. 5E.) See Fig. 6 for correct positioning of sensing bulb.

11.Proceed with remainder of unit installation.

→FAN COIL

To obtain efficiency rating for 38TDB037 with FV4ANB006 fancoil TXV must be replaced with factory supplied TXV.

Replacing R-22 TXV or Non-Balance Port Puron TXV

→1. Remove any existing refrigerant and ensure coil has not been exposed to atmospheric pressure for more than 15 minutes.

2.Remove coil access panel and fitting panel from front of cabinet.

3.Remove and save TXV support clamp using the 5/16-in. nut driver. Save the clamp.

B

INLET

D A

COIL

E

BULB

INSULATION

TAPE

C

A01418

Fig. 5—TXV Kit Contents

SENSING BULB

STRAP

8 O'CLOCK 4 O'CLOCK

A00399

Fig. 6—Positioning of Sensing Bulb

4.Remove TXV using a backup wrench on flare connections to prevent damage to tubing.

5.Using wire cutters, cut equalizer tube off flush with vapor tube inside cabinet.

6.Remove bulb from vapor tube inside cabinet.

7.Braze equalizer stub-tube closed. Use protective barrier as necessary to prevent damage to drain pan.

IMPORTANT: Route the equalizer tube of the approved Puron® TXV through suction line connection opening in fitting door prior to replacing fitting panel around tubing.

8.Install TXV (Fig. 5A) with 3/8-in. copper tubing through small hole in service panel. Use wrench and backup wrench, to avoid damage to tubing valve.

9.Reinstall TXV support clamp (removed in item 3).

10.Attach TXV bulb to vapor tube inside cabinet, in same location as original was when removed, using supplied bulb straps. (See Fig. 5C.) See Fig. 6 for correct positioning of sensing bulb. Insulate bulb with factory-supplied insulation tape. (See Fig. 5E.)

11.Route equalizer tube through suction connection opening (large hole) in fitting panel and install fitting panel in place.

12.Sweat inlet of TXV, marked “IN” to liquid line. Avoid excessive heat which could damage valve.

13.Install vapor elbow (see Fig. 5B) with equalizer adapter to vapor line of line set and vapor connection to indoor coil. Adapter has a 1/4-in. male connector for attaching equalizer tube. (See Fig. 5B.)

14.Connect equalizer tube of TXV by 1/4-in. equalizer fitting, on vapor line adapter. Use backup wrench to prevent damage to equalizer fitting.

15.Proceed with the remainder of unit installation.

LONG-LINE APPLICATIONS

For refrigerant piping arrangements with equivalent lengths greater than 50 ft or when elevation difference between indoor and/or outdoor unit is more than 20 ft, follow all requirements of the Long-Line Guideline section in the Application Guideline and Service Manual—Air Conditioners and Heat Pumps Using Pu- ron® Refrigerant.

Step 6—Make Piping Connections

Relieve pressure and recover all refrigerant before system repair or final unit disposal to avoid personal injury or death. Use all service ports and open all flow-control devices, including solenoid valves.

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