|
| |
TM 5-4120-287-15
b.
Do not expose the eyes to the refrigerant. If refrigerant-12 comes in contact with eyes, observe the following
instructions.
(1) Do not rub the eye(s).
(2) Arrange at once to take the effected person to an eye specialist.
(3) Put drops of sterile mineral oil into the eyes to remove the excess refrigerant.
(4) Wash the eyes with either a weak solution of boric acid or a sterile salt solution (not to exceed 2 percent sodium
chloride).
c.
Do not expose the skin to the liquid refrigerant. If the liquid comes in contact with the skin treat the injury the same
as though the skin has been frostbitten or frozen. If a person is overcome in an area which lacks oxygen because of the
presence of a high concentration of refrigerant-12, treat the person by applying artificial respiration produced manually or
by a pulmotor.
7-3.
Refrigerant Service Cylinder Handling Procedures
The following precautions must be observed when handling refrigerant bottles.
a.
Do not leave the refrigerant bottle uncapped. All refrigerant bottles are shipped with a metal screw cap to protect
the valve and safety plug from damage. Replace the cap after each use of the refrigerant bottles.
b.
Do not carry or otherwise transport a refrigerant bottle in the passenger compartment of a vehicle or carrier. Do not
expose refrigerant bottle to radiant heat from the sun because the resulting increase in pressure can cause the safety plug
to release or the bottle to burst.
c.
Never subject the refrigerant bottle to high temperature when adding refrigerant to the air conditioning system. A
bucket of hot water (not over 125F), or hot wet rags around the bottle provides all the heat required to raise the refrigerant
in the bottle to a pressure higher than the pressure in the system when adding refrigerant.
7-4.
Checking Refrigerant Charge Level
a.
Check the refrigerant liquid sight indicator after the unit has been operating in the cooling cycle for five or more
minutes (2-8-c (1)). If the refrigerant system requires additional refrigerant, bubbles or milky flow will appear in the liquid
sight indicator glass.
b.
Set Master Circuit breaker to OFF position.-
7-5.
Adding Refrigerant
a.
Remove the air conditioner right-side panel access assembly (para 3-29 a).
b.
Set up the refrigeration system charging apparatus, (fig. 7-1) near the condenser stage section.
c.
Close the refrigerant control valve and vacuum control valve.
d.
Connect the refrigerant supply hose to a refrigerant-12 bottle.
WARNING
Wear protective gloves and goggles when handling refrigerant-12 service cylinders.
e.
Remove the air conditioner charge valve cap and connect the evacuation and charge hose to the charge valve. Do
not tighten the coupling on the hose at the air conditioner charge valve.
f.
Open the charging unit refrigerant control valve to permit refrigerant-12 to escape from the coupling at the charge
valve.
g.
When the refrigerant-12 has displaced the air trapped in the evacuation and charge hose, tighten the coupling on the
hose, and close the refrigerant charge valve.
h.
Unlock the scale lock and invert the refrigerant-12 bottle on the platform scale.
i.
Open the air conditioner charge valve.
NOTE
The maximum weight of the refrigerant-12 bottle shall not exceed 55 pounds
j.
Use three or four quarter-turn fasteners to mount the right-side panel assembly to the cabinet, allowing the
evacuation and charge hose to pass between the panel assembly and the cabinet.
k.
Operate the air conditioner in the cooling mode.
I.
Open the refrigerant-12 bottle valve.
m. While observing the liquid sight indicator, admit small quantities of refrigerant-12, using the refrigerant control valve
to meter the flow. When the bubbles or milky flow in
7-2
|
