Step 2 — Install Piping
Shut off all power to the unit, then lock out and safety-tag all disconnects before proceeding with installation.
Remove refrigerant charge from circuits using an ap- proved refrigerant recovery device before proceeding with installation.
NOTE: The units have 2 circuits. Perform all of the following piping installation procedures on both A and B circuits.
REMOVE MINIMUM LOAD PORT PLUGS AND IN- STALL FITTINGS — Plugs must be removed from these ports and replaced with O-ring seal fittings. Note that plugs were factory-installed with Loctitet 554 or equivalent refrigerant-compatible sealant. Fittings should be installed with similar sealant on threads.
30GXN,R — Cut plug end off of minimum load port braze nipple on discharge line, located between oil separator and con- denser. Remove plug from minimum load port on cooler shell. See Fig. 1. Using thread sealant, install O-ring seal fitting in minimum load port on cooler. Port on nipple in discharge line is reserved for a brazed connection.
30HX — Remove plugs from minimum load ports on the cool- er shell and the condenser shell (30HXC) or oil separator (30HXA). See Fig. 2. Using thread sealant, install O-ring seal fittings in minimum load ports.
INSTALL PIPING — On 30GXN,R units, carefully thread the cooler tube assemblies (P/N 30GX503487) on the O-ring seal fittings installed in the cooler port. Do not tighten. Install field- supplied 5/8-in. OD copper tubing between the tube assembly and the brazed nipple on the discharge line.
On 30HX units, carefully thread the cooler tube assemblies (P/N 30GX503487) and the condenser oil separator tube as- sembly (P/N 30HX402343) on the O-ring seal fittings installed in the cooler and condenser/oil separator ports. Do not tighten. Install field-supplied 5/8-in. OD copper tubing between the tube assemblies on the cooler shell and condenser (30HXC) or oil separator (30HXA).
INSTALL BALL AND SOLENOID VALVES — 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. 3A and 3B show a typical 30GXN,R installation, in- cluding valve locations and orientation. Ensure that ball valve is fully open, and that both the ball and solenoid valve are pro- tected from excess heat during brazing process. Wrap wet cloths around valve bodies and tube assembly locking nuts during brazing to prevent damage to the valves and O-rings from heat.
CONNECT PIPING — Lubricate O-rings with a light coating of polyalphaolefin lubricant suitable for R-134a systems. Thread tube assembly nuts onto the O-ring seal fittings until they are finger-tight. Lightly snug the nut with a wrench; DO NOT OVER TIGHTEN. You should be able to feel the O- ring compress on the last 1/4-turn.
IMPORTANT: DO NOT over tighten the O-ring seal nut. Damage will occur to the seal, resulting in leaks.
