T Therm Geo TST-***, Инструкция по установке и эксплуатации

Страница: 21 / 53

12/03/2012
19 GI301
Coil in Supply Plenum Method Coil in Return Ductwork Method
Installing the TXV on TTHERM GEO TST Units
1. Be familiar with the following sections in the Installation & Operating Instructions manual:

Mechanical Installation Refrigeration (line set size and length)

Charging Procedure (adding or removing refrigeration)

Superheat and Sub-Cooling (adjusting charge for best performance)
2. Determine if there is enough room to install the TXV inside the plenum. Depending on plenum, it may
be possible on the TST 024 and 036. It is best to plan on installing the TXV outside the plenum on TST
048 and 060. If the TXV is mounted outside the plenum you will need to braze a copper pipe extension
to the refrigerant distributor cone and route it outside the plenum.
Note: Check TXV installation illustrations in this manual and those packaged with it to be sure the TXV
is installed in an orientation that will allow it to work properly.
All brazing will need to be done at the same time so a 2-3 psi nitrogen purge can flow through the line set,
TXV, and coil while brazing. Low silver copper braze alloy shall be used on all copper to copper brazed
connection points. A high silver brazing material like Harris Safety-Silv® 45FC – (45% silver) should be
used when brazing the Brass Distributer cone to the copper pipe. Be careful to keep the temperature
sensitive components (TXV) cool during the brazing process.
3. Position the TXV and construct a copper refrigerant line from the out port on the TXV to the distributor
cone of the A-coil.
Note: Remember the capillary tube must extend far enough for proper installation of the bulb. The bulb
must be located past the last refrigerant circuit getting on the manifold and in a horizontal plane. The
bulb must be in contact with the horizontal line for it entire length, and positioned at the 9 or 3 o’clock
position on the pipe. Remember do not attach the TXV bulb to the suction line until all brazing is
complete and the line has cooled.