Advertisement
E. INSTALLING REFRIGERANT LINES
The following steps are to be considered when installing the
refrigerant lines:
1.
Determine the most practical way to run the lines.
2. Consider types of bends to be made and space limita-
tions.
NOTE: Large diameter tubing sizes will be difficult
to
bend once it has been shaped.
3. Determine the best starting point for routing the refrig-
erant tubing --INSIDE OR OUTSIDE THE STRUC-
TURE.
4. Provide a pull through hole of sufficient size to allow
both liquid and gas lines to clear. The location of this
hole
(if
practical) should be just above the wall plate
which is resting on the foundation.
5. Be sure the roll of tubing is of sufficient length.
6. Uncoil the tubing- do not kink or dent.
7. Route the tubing making all required bends and prop-
erly secure the tubing before malting final connections.
NOTE: These lines must be isolated. from the struc-
ture and the holes must be sealed weather tight after
installation.
F. FIELD FABRICATED INTERCONNECTING LINES
The following procedure should be used for connecting
tub-
ing to the coil or the outdoor unit.
1.
More information concerning the installation ofrefriger-
ant lines is covered in the Installers Guide packaged
with the outdoor unit. Evacuation, leak testing and
brazing procedures are included in those instructions
before starting the installation of refrigerant lines.
Figure 12
18-AH4401-6
Installer's Guide
G. BRAZING TO EVAPORATOR SECTION
IMPORTANT: Do not unseal refrigerant tubing until ready
to
cut and fit refrigerant lines.
There is only a holding charge of dry Nitrogen in the indoor
coil, therefore no loss of operating refrigerant charge occurs
when the sealing plugs are removed.
NOTE: TXV bulb
MUST
be protected (wrapped with
wet rag) or removed, while brazing the tubing. Over-
heating of the sensing bulb will affect the functional
characteristics and performance of the coil.
NOTE: Torque specification for TXV equals 1/6
turn
past finger tight. Make sure to backwrench when
tightening. See Figure 12.
1.
Remove both seals from the indoor coil. The braze caps
are soft soldered.
2. Field supplied tubing should be cut squared-off, ensuring
the tube is still round and free of burrs at the connect-
ing end. Clean the tubing to prevent contaminants
from entering the system.
3. Run the refrigerant tubing into the stub tube sock-
ets of the indoor unit coil.
IMPORTANT: PAINTED AREAS OF THE UNIT MUST BE
SHIELDED DURING BRAZING.
4. Braze
and
evacuate according to indoor and outdoor
installation instructions.
5. li1ow a small amount of nitrogen through the tubing
while brazing.
6. Use good brazing technique to make leakproofjoints.
7. Minimize the use of
sharp
900 bends.
8. Insulate the suction line and its fittings.
9. Do NOT allow uninsulated lines to come into contact
with each other.
10. Upon completion of installation, evacuate the refriger-
ant lines.
A
CAUTION
Do
Nm
open refrigerant valve at
the
outdoor unit until the
re-
frigerant lines and coil hsvebeenbrszed, evacuated, and leak
checked. This would cause contamination of the refrigerant
or possible discharge of refrigerant to the atmosphere.
5
Advertisement
