RE-ASSEMBLING, BRAZING AND CLEANING
OF JOINT CONNECTIONS
CAUTION: When using hard solder, an inert gas such as dry
nitrogen must be introduced and permitted to flow
through tubing during brazing to displace air and
prevent oxidation.
Remove the Schrader valve cores from the service valves.
Remove the plugs from the service valve field tubing connec-
tions. Clean the joints to be brazed.
NOTE: Do not overheat the connection to be brazed as this
can cause improper flow of solder, resulting in a weak
and leaking joint. Never apply heat directly to face of
fitting. Do not heat solder by direct contact with flame
of the torch.
When brazing copper tubing it is very important to preheat the
entire joint before applying the solder. This is done by sweeping
the flame steadily and evenly around the fitting, to bring both
fitting and tubing up to equal temperature before applying the
solder.
Reassemble groups of tubing and fittings, brazing several joints
instead of one joint at a time. This reduces the chance for error
in the alignment of the assembly. Replace Schrader valve
cores. DO NOT OPEN SERVICE VALVES AT THIS TIME.
Clean joint connection immediately after brazing with wet rag.
REFRIGERANT LINE SUPPORT
Refrigerant lines should be supported in a way that no dips or
sags occur. We recommend four feet between supports. If
refrigerant lines are to be attached to the home structure, care
should be taken to eliminate the transmission of vibrations.
Attach the refrigerant lines to the indoor coil first. Remove plugs
from the indoor coil, then clean joints to be brazed. Braze
refrigerant lines to the indoor coil. Attach refrigerant lines to the
outdoor unit.
CHARGING AND LEAK TESTING
On systems with or without service valves the refrigerant
should be recovered or recycled in accordance with EPA regu-
lations. In some cases this may require putting piercing valves
on both the high and low sides of the system.
WARNING: DO NOT vent refrigerant to the outdoors.
When recovering refrigerant from a system, with a burnout,
follow a safe procedure due to possible contamination.
CAUTION: Avoid getting the refrigerant in the eyes or on the
skin.
Contaminated refrigerant must be recovered and returned to
the local refrigeration supply house for proper disposition.
TOTAL LINE LENGTH
For systems with total line length exceeding 50 feet, see
APPLICATION DATA, 690.01-AD1V (1296) and worksheet
690.01-AD1.1V(791) "General Piping Recommendations and
Refrigerant Line Length" for vapor and liquid line sizing, cali-
bration of liquid line pressure loss or gain, determination of
vapor line velocity, elevation limitations, orifice connections,
system charging, traps, etc.
Total line lengths are limited to 75 feet due to the storage
capacity of the accumulator. Systems with total line lengths
over 50 feet must be provided with:
1. Low Voltage Start Kit
Elevation differences are limited to:
Indoor above outdoor . . .50 ft.
Outdoor above indoor . . .50ft.
Systems with liquid line pressure loss or gain greater than 11
psi must be provided with corrected orifice size.
ORIFICE SELECTION (Orifice Type Coils Only)
NOTE: The proper orifice must be installed in the evaporator
coil liquid line connection prior to the connection of the
refrigerant lines.
WARNING:Coil is under 35 psig (Inert gas) pressure,
Each coil has an orifice installed in the fitting between the liquid
line connection and distributor. The orifice is identified on a label
next to the liquid line connection.
The orifice shipped with the condenser is based on the “most
sold” combination, but it may be changed, depending on the
capacity and efficiency of the outdoor unit, elevation differ-
ences, and/or long total line lengths. An additional orifice(s) is
shipped with most outdoor units for the most commonly re-
quired replacement combinations. Other sizes must be ordered
from the Source 1 Parts if required.
See the appropriate Tabular Data Sheet for the correct orifice
size and charge adder. If the orifice size matches, nothing
further is required and the refrigerant lines may be connected
per the outdoor unit instruction. However, if another orifice
should be used, see the coil instruction for details to change
the orifice in the coil.
REFRIGERANT VALVE OPERATION
WARNING:All outdoor units are shipped with the service
valves in the closed position. After installation of the
refrigerant lines and proper evacuation, make sure
that all valves are in the open position and that the
caps are securely tightened before turning ON the
electrical power to the outdoor unit.
All models in this series have brass service valves. These
valves are not back seating. Opening or closing valve does not
close service port. Service ports have Schrader valves for
gauge connections. Use back-up wrench on valve body when
removing cap to open or close the valve. To open, insert hex
wrench into stem and back out counter clockwise until stem just
touches retaining ring.
L I QUI D
L I NE
TAPE
INSULATED VAPOR LINE
CORRECT
INCORRECT
SHEET METAL HANGER
FIGURE 3 - Vapor Line Insulating
515.16-N3Y
4
Unitary Products Group
