Installer's Guide - Trane 4TTR3 Installer's Manual

LiqUid LinE SERVicE VALVE
3
NOTE:
Use care to make sure that no moisture enters pressure
tap port, while wet rag is being used.
NOTE:
Precautions should be taken to avoid heat damage to
basepan during brazing. It is recommended to keep the
flame directly off of the basepan.
7. Use a Dry Nitrogen Purge and Brazing Alloy without
flux when brazing the field line to the copper factory
connection. Flow dry nitrogen into either valve
pressure tap port, thru the tubing and out the other
port while brazing.
8. Braze using accepted good brazing techniques.
leAk CheCk
IMPORTANT:
Replace pressure tap port valve core before attaching hoses
for evacuation.
After the brazing operation of refrigerant lines to both the
outdoor and indoor units is completed, the field brazed
connections must be checked for leaks. Pressurize through
the service valve ports, the indoor unit and field refrigerant
lines with dry nitrogen to 350-400 psi. Use soap bubbles or
other leak-checking methods to see that all field joints are
leak-free! If not, release pressure; then repair!
SyStEM EVAcUAtiOn
NOTE:
Since the outdoor unit has a refrigerant charge, the gas
and liquid line valves must remain closed.
1. Upon completion of leak check, evacuate the refrigerant
lines and indoor coil before opening the gas and liquid
line valves.
2. Attach appropriate hoses from manifold gauge to gas
and liquid line pressure taps.
NOTE:
Unnecessary switching of hoses can be avoided and
complete evacuation of all lines leading to sealed system
can be accomplished with manifold center hose and
connecting branch hose to a cylinder of R-410A and
vacuum pump.
3. Attach center hose of manifold gauges to vacuum
pump.
4. Evacuate until the micron gauge reads no higher than
350 microns.
5. Close off valve to vacuum pump and observe the micron
gauge. If gauge pressure rises above 500 microns in one (1)
minute, then evacuation is incomplete or system has a leak.
18-AC71D1-5

Installer's Guide

6. If vacuum gauge does not rise above 500 microns in one
(1) minute, the evacuation should be complete.
7. Blank off vacuum pump and micron gauge, close valves
on manifold gauge set.
NOTE:
DO NOT VENT REFRIGERANT INTO THE ATMOSPHERE.
NOTE:
A 3/16" Allen wrench is required to open liquid line
service valve. A 1/4" Open End or Adjustable wrench is
required to open gas line valve. A 3/4" Open End wrench
is required to take off the valve stem cap.
8. The liquid line shut-off valve can now be opened.
Remove shut-off valve cap. Fully insert hex wrench
into the stem and backout counterclockwise until valve
stem just touches rolled edge (approximately five [5]
turns) observing WARNING statement on page 2. See
Figure 3.
9. Replace liquid service pressure tap port cap and valve
stem cap. These caps MUST BE REPLACED to
prevent leaks. Replace valve stem cap and pressure tap
cap finger tight, then tighten an additional 1/6 turn.
10. The gas valve can now be opened. Open the gas valve
by removing the shut-off valve cap and turning the
valve stem 1/4 turn counterclockwise, using 1/4" Open
End or Adjustable wrench. See Figures 4 and 5.
11. The gas valve is now open for refrigerant flow. Replace
valve stem cap to prevent leaks. Again, these caps
MUST BE REPLACED to prevent leaks. Replace
valve stem cap and pressure tap cap finger tight, then
tighten an additional 1/6 turn. See Figures 4 and 5.
If refrigerant lines are longer than fifteen (15) feet
and/or a different size than recommended, it will be
necessary to adjust system refrigerant charge upon
completion of installation. See page 6 or the unit
Service Facts.
GAS LinE BALL SERVicE VALVE
4
CAP
UNIT SIDE
OF VALVE
PRESSURE TAP PORT
GAS LINE CONNECTION
GAS LinE SERVicE VALVE
5
1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION
VALVE STEM
3