SECTION IV: ORIFICE INSTALLATION
Failure to install Schrader Valve Core on orifice applications could result in total refrigerant loss of the system!
Install Schrader Valve Core and Orifice as follows:
1.Slide indoor coil out of cabinet far enough to gain access to equal- izer fitting on the suction line.
2.After holding charge is completely discharged remove black plas- tic cap on equalizer fitting.
3.Install Schrader Valve Core supplied with the outdoor unit into equalizer fitting using a valve core tool.
4.Loosen and remove the liquid line fitting from the orifice distributor assembly. Note that the fitting has right hand threads.
5.Install proper size orifice supplied with outdoor unit. Refer to sup- plied Tabular Data Sheet for specific orifice size and indoor coil match up.
6.After orifice is installed reinstall the liquid line to the top of the ori- fice distributor assembly. Hand tighten and turn an additional 1/8 turn to seal. Do not over tighten fittings.
7.Leak test system.
8.Replace black plastic cap on equalizer fitting.
9.Slide indoor coil back into cabinet.
LIQUID LINE SWIVEL COUPLING
(This fitting is a
ORIFICE
DISTRIBUTOR
FIGURE 5: Orifice Installation
SECTION V: TXV INSTALLATION
When using a TXV, 13 SEER models
The following are the basic steps for installation. For detailed instruc- tions, refer to the Installation Instructions accompanying the TXV kit. Install TXV kit as follows:
Only 1TVM900 series valves are to be used on this product.
1.Relieve the holding charge by pulling off the rubber cap plug on the suction manifold line of the coil.
2.After holding charge is completely discharged, loosen and remove the Schrader cap seal.
3.Loosen and remove distributor cap seal.
4.Install the thermal expansion valve to the orifice distributor assem- bly with supplied fittings. Hand tighten and turn an additional 1/4 turn to seal. Do not overtighten fittings.
5.Install the liquid line to the top of the thermal expansion valve with fitting supplied with the liquid line. Hand modify the liquid line to align with casing opening. Hand tighten the liquid line and an addi- tional 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 an additional 1/3 turn to seal.
7.Install the TXV bulb to the vapor line near the equalizer line, using the bulb clamp(s) furnished with the TXV assembly. Ensure the bulb is making maximum contact.
a.Bulb should be installed on a horizontal run of the vapor line if possible. The bulb should be installed on top of the line.
b.If bulb installation is made on a vertical run, the bulb should be located at least 16” (40.6 cm) from any bend, and on the tubing sides opposite the plane of the bend. The bulb should be positioned with the bulb tail at the top, so that the bulb acts as a reservoir.
c.Bulb should be insulated using thermal insulation provided to protect it from the effect of the surrounding ambient tempera- ture. Cover completely to insulate from
In all cases, mount the TXV bulb after vapor line is brazed and has had sufficient time to cool.
Schrader valve core MUST NOT be installed with TXV installation. Poor system performance or system failure could result.
SECTION VI: EVACUATION
It will be necessary to evacuate the system to 500 microns or less. If a leak is suspected, leak test with dry nitrogen to locate the leak. Repair the leak and test again.
To verify that the system has no leaks, simply close the valve to the vac- uum pump suction to isolate the pump and hold the system under vac- uum. Watch the micron gauge for a few minutes. If the micron gauge indicates a steady and continuous rise, it’s an indication of a leak. If the gauge shows a rise, then levels off after a few minutes and remains fairly constant, it’s an indication that the system is leak free but still con- tains moisture and may require further evacuation if the reading is above 500 microns.
Johnson Controls Unitary Products | 5 |
