York THGD Series Installation Manual

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York THGD Series Installation Manual Manual pdf 5 page image

835961-UIM-D-0213Johnson Controls Unitary Products 5SECTION IV: ORIFICE INSTALLATIONInstall Schrader Valve Core and Orifice as follows:1. Relieve the holding charge by depressing the Schrader valve stemlocated in the end of the liquid line. Cut the spundown copper toallow installation of the suction line.2. Slide indoor coil out of cabinet far enough to gain access to equal-izer fitting on the suction line.3. After holding charge is completely discharged remove black plasticcap on equalizer fitting.4. Install Schrader Valve Core supplied with the outdoor unit into equal-izer fitting using a valve core tool.5. Loosen and remove the liquid line fitting from the orifice distributorassembly. Note that the fitting has right hand threads.6. Install proper size orifice supplied with outdoor unit. Refer to sup-plied Tabular Data Sheet for specific orifice size and indoor coilmatch up.7. After orifice is installed reinstall the liquid line to the top of the orificedistributor assembly. Hand tighten and turn an additional 1/8 turn toseal. Do not over tighten fittings.8. Leak test system.9. Replace black plastic cap on equalizer fitting.10.Slide indoor coil back into cabinet.SECTION V: TXV INSTALLATIONSFor installations requiring a TXV, the following are the basic steps forinstallation. For detailed instructions, refer to the Installation Instructionsaccompanying the TXV kit.Install TXV kit as follows:1. Relieve the holding charge by depressing the Schrader valve stemlocated in the end of the liquid line. Cut the spundown copper toallow installation of the suction line.2. After holding charge is completely discharged, loosen and removethe Schrader cap seal.3. Loosen and remove distributor cap seal.4. Install the thermal expansion valve to the orifice distributor assemblywith supplied fittings. Hand tighten and turn an additional 1/4 turn toseal. Do not overtighten fittings.5. Install the liquid line to the top of the thermal expansion valve with fit-ting supplied with the liquid line. Hand modify the liquid line to alignwith casing opening. Hand tighten the liquid line and an additional 1/4 turn to seal.6. Install the TXV equalizer line into the vapor line as follows:a. Hand tighten the 1/4” SAE nut to the Schrader fitting and anadditional 1/3 turn to seal.7. Install the TXV bulb to the vapor line near the equalizer line, usingthe bulb clamp(s) furnished with the TXV assembly. Ensure the bulbis making maximum contact.a. Bulb should be installed on a horizontal run of the vapor line ifpossible. On lines under 7/8" O.D. the bulb may be installedon top of the line. With 7/8" O.D. and over, the bulb should beinstalled at the position of about 2 or 10 o'clock.b. If bulb installation is made on a vertical run, the bulb shouldbe located at least 16” (40.6 cm) from any bend, and on thetubing sides opposite the plane of the bend. The bulb shouldbe positioned with the bulb tail at the top, so that the bulb actsas a reservoir.c. Bulb should be insulated using thermal insulation provided toprotect it from the effect of the surrounding ambient tempera-ture. Cover completely to insulate from air-stream.All connections to be brazed are copper-to-copper and should bebrazed with a phosphorous-copper alloy material such as Silfos-5 orequivalent. DO NOT use soft solder.Install the TXV bulb to the vapor line near the equalizer line, using thetwo bulb clamps furnished with the TXV assembly. Ensure the bulb ismaking maximum contact. Refer to TXV installation instruction for viewof bulb location.Failure to install Schrader Valve Core on orifice applications couldresult in total refrigerant loss of the system!FIGURE 5: Orifice InstallationLIQUID LINESWIVEL COUPLING(This fitting is a right-hand thread,turn counter-clockwise to remove)ORIFICEDISTRIBUTORIn all cases, mount the TXV bulb after vapor line is brazed and hashad sufficient time to cool.Schrader valve core MUST NOT be installed with TXV installation.Poor system performance or system failure could result.Dry nitrogen should always be supplied through the tubing while it isbeing brazed, because the temperature is high enough to cause oxi-dation of the copper unless an inert atmosphere is provided. The flowof dry nitrogen should continue until the joint has cooled. Always usea pressure regulator and safety valve to insure that only low pressuredry nitrogen is introduced into the tubing. Only a small flow is neces-sary to displace air and prevent oxidation.In all cases, mount the TXV bulb after vapor line is brazed and hashad sufficient time to cool.