Sea Frost DC 5000 - Manual (Page 26)

26
CONNECTING GAUGES
To connect service gauges to the access service ports, remove the protective sealing
caps from the service ports on the DC 5000. Note that the ports are of different sizes.
The larger diameter port is the discharge side and the smaller port is the suction side.
Pull back the collar on the connecting valve and push it over the appropriate access
port.
IMPORTANT: There may be a variation in the interface (depending on the brand of
service valve being used) between the connecting valve and the service port core valve.
It is important to open each connecting valve carefully. Do not force the connecting
valve or turn it to it's stop. Forcing the connecting valve will bend the service port
core valve creating a leak.
Turn the connecting valve clockwise to open. During the service operation these
valves are left open. Control of refrigerant and vacuum is by the manifold hand
wheels.
TO INSTALL GAUGES ON AN UNCHARGED SYSTEM to be evacuated no purging or
venting is needed.
TO INSTALL GAUGES ON A CHARGED SYSTEM, with the system off, attach the
connecting valves to the service ports. Proceed to Venting the Gauge Set.
DISCONNECTING GAUGES
Disconnecting the gauge set after running the system may be done by turning off the
discharge connecting valve first. Remove the connecting valve and re-cap the access
service port. Turn off the refrigerant supply. Be sure the end of the yellow center hose
is closed. Both hand wheels on the gauge set may now be opened and the compressor
operated to extract the refrigerant from the gauges. When the pressure in both gauges
drops to the low side operating pressure turn off the hand wheels and the connecting
valve. Turn off the compressor. Remove the remaining connecting valve and re-cap the
access service port.
Disconnecting the gauge set on a static system may be done by turning off the
connecting valves and disconnecting them from the access service ports. Re-cap the
access service ports.