Parker Sporlan LAC-4 Installation & Servicing Instructions

Head Pressure Control Valves
LAC-4 and LAC-4-DS
INSTALLATION AND SERVICING INSTRUCTIONS
SD-134 / 82021
INSTALLATION INSTRUCTIONS
To ensure proper performance, head
pressure control valves must be selected
and applied correctly. This is covered
thoroughly in Bulletin 90-30. However,
proper installation procedures are equally
important.
Valve Location/Piping Suggestions
LAC-4 valves can be installed in horizontal
or vertical lines, whichever best suits the
application and permits easy accessibil-
ity of the valves. However, consideration
should be given to locating these valves
so they don't act as oil traps or that solder
cannot run into the internal parts dur-
ing brazing. Care should also be taken
to install the valves with the flow in the
proper direction.
Figure 3 is a piping schematic only to illus-
trate the general location of the LAC-4
valve. In most cases the valve is located at
the condensing unit. When the condenser
is remote from the compressor, the usual
location is near the compressor. Spor-
lan recommends that recognized piping
references be consulted for assistance in
piping procedures. Sporlan is not respon-
sible for system design, any damage aris-
ing from faulty system design, or for mis-
application of its products. If these valves
are applied in any manner other than as
described in this bulletin, the Sporlan
warranty is void.
Inlet Strainer
- The need for an inlet
strainer is a function of system cleanliness.
Inlet strainers are available for the LAC-4
and LAC-4-DS (3/8" ODF fittings must
have a rolled stop to support the strainer).
Keep in mind that the LAC model actu-
ally has two inlet fittings (condenser and
discharge) and it may be desirable to use
an inlet strainer in both fittings.
Table 1
FITTING SIZE
3/8"
-
1/2"
Brazing Procedures
monly used brazing alloys for high side
usage are satisfactory. However, when sol-
dering or brazing, it is very important that
the internal parts be protected by wrap-
ping the valve with a wet cloth to keep the
body temperature below 250°F. Also, when
using high temperature solders, the torch
tip should be large enough to avoid pro-
longed heating of the copper connections.
And, always direct the flame away from the
valve body.
Test and Operating Pressures
dry gases such as nitrogen, CO
are often used for leak detection. Excessive
leak testing or operating pressures may
damage these valves or reduce the life of
the diaphragm or bellows.
CAUTION: Inert gases must be added
to the system carefully through a
pressure regulator. Unregulated gas
pressure can seriously damage the
system and endanger human life.
Never use oxygen or explosive gases.
The maximum pressure that this valve
can withstand without damage is 500 psig.
Care must be taken to keep test or operat-
ing pressures below this maximum rated
pressure.
INLET STRAINER
PART NUMBER
825-003
825-004
- Any of the com-
- Inert
or helium
2