Carrier 30HX076-271 Dehydrate and Recharge Circuit, Installing Fittings and Valves, 30HX Typical

INSTALL BALL AND SOLENOID VALVES Ð Using good piping practice, braze ball valve and solenoid valve into 5¤8-in. minimum load piping. Fig. 2 shows a typical 30HX installation and Fig. 3 shows a typical 30GX installation, in- cluding valve locations and orientation. Ensure that ball valve is fully open, and that both the ball and solenoid valve are protected from excess heat during brazing process. Wrap wet cloths around valve bodies during brazing to prevent dam- age to the valves from heat.

IMPORTANT: When installing solenoid valve, make sure that ¯ow direction arrow on valve body points towards the cooler. The minimum load control will not function correctly if this valve is installed backwards.

CONNECT PIPING Ð Check the ends of the tubes where they will be inserted into the Swagelok ®ttings. To avoid leaks, tube ends must be round and free of burrs, nicks, and grooves.

Insert tube ends into ®ttings as far as they will go. When tube bottoms out, tighten the compression nut ®nger-tight while holding the ®tting body. Use backup wrench to hold ®tting body and tighten compression nut another 11¤4 turns.

IMPORTANT: Do NOT overtighten the ®ttings. Over- tightening the ®ttings can deform the tube ends and cause leaks.

30GX UNITS ONLY Ð Using good brazing practice, braze the 5¤8-in. minimum load tubing to the copper nipple on the discharge line (minimum load port) between the condenser coil and oil separator. See Fig. 1 and 3.

Step 3 Ð Dehydrate and Recharge Circuit

ÐWhen piping has been completed, leak test the assem- bly. If one of the Swagelok ®ttings leaks, slowly tighten the compression nut until the leak stops. If this does not ®x the leak, the connection must be reinstalled using a new ferrule and backup ring in the ®tting. Contact your Carrier repre- sentative for assistance in locating these parts.

After leak testing, evacuate, dehydrate, and recharge the circuit using an approved refrigerant recovery device. Cor- rect type and amount of refrigerant are listed on unit name- plate and in base unit documentation.

Fig. 2 Ð Installing Fittings and Valves, 30HX (Typical)

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