Operating instructions

The following instructions should be followed in
evacuating and charging a Cruisair remote con
-
densing unit system with R-22.
CHAPTER 4: Start Up Procedures - Initial Charging Of A New System
Warning • • • • • • •
Federal law prohibits the intentional
release of refrigerant gas into the
environment and requires that you use
EPA approved refrigerant handling
equipment and procedures to prevent any
refrigerant gas from escaping into the air.
10
There are three refrigerant circuit components
in a Cruisair remote condensing unit system: the
condensing unit, the cooling/heating unit and
the copper refrigerant lines. The condensing
unit is shipped from the factory charged with
approximately the amount of refrigerant needed for
the whole system. The cooling unit is pressurized
with dry nitrogen and the copper tubing contains air.
The procedure will be to evacuate the nitrogen
and air from the cooling unit and the copper tubing,
then release the refrigerant from the condensing
into the entire system. To facilitate this procedure,
there is a special port with a red cap located on the
right hand base valve of the condensing unit.
Required Tools
• Refrigerant 22 container (typically the
disposable type container color coded green
for R-22)
• Four valve gauge manifold with self closing
ttings on the charging hoses
• Vacuum pump
• Base valve wrench and hand tools
• Accurate thermometer
Proceed as Follows
1. Make sure all are joints are well made and
tight.
2. Do not touch the condensing unit base valve
stem covers or service port caps. Remove the
red port cap on the right hand base valve.
3. Connect the vacuum pump hose to the
vacuum pump. Connect the refrigerant supply
line to the refrigerant container (make sure
the container valve is OFF). Connect the low
pressure gauge hose, equipped with self
closing ttings to the red capped port. At
this point do not connect the high pressure
charging hose to anything.
4. Close all gauge manifold valves.
5. Energize the vacuum pump and open manifold
valves for the vacuum pump, the refrigerant
container, and the red capped access port low
pressure test gauge).
6. As the pump operates, you will see the low
pressure test gauge fall to a vacuum. When he
vacuum reaches 28 in. HG, close the vacuum
pump valve and turn the vacuum pump off.
Leave the system for 15 minutes and then
observe the gauge. If any vacuum is lost, a
leak is indicated. Find the source of the leak
and correct. Return to step #3 above and
re-evacuate the system. Continue until the
system will hold the vacuum.
7. Open the vacuum pump valve and leave the
vacuum pump operating for at least 6 hours
or until a vacuum of at least 29 in. HG is
achieved. Close the vacuum pump valve and
turn the vacuum pump off. Wait one hour. If
no vacuum is lost, proceed with charging. If
any vacuum is lost, a leak is indicated. Find
the source of the leak and correct. Return to
step #3 above and re-evacuate the system.
Continue until the system will hold the
vacuum.
8. Open the refrigerant container valve slowly
and allow gas to enter the system until the
gauge rises to zero. You have now lled the
evacuated lines and cooling/heating unit with
refrigerant to a gauge pressure of zero. Close
the refrigerant container valve.
9. Remove the low pressure gauge hose from
the red capped port. Replace and tighten the
red cap.
10. Remove both condensing unit base valve
stem caps. Open both base valves fully by
turning the valve seems fully counterclock
wise. This will allow the refrigerant in the
condensing unit to enter the system. Replace
and tighten the valve stem caps.
At this point, the system is basically charged and
ready for nal gas charge adjustment.