Page 16
Vapor Line (Ball Type) Service Valve
A ball-type full service valve is used on 14HPX. Valves
are not rebuildable. If a valve has failed it must be replaced. A
ball valve is illustrated in figure 17.
The ball valve is equipped with a service port. A schrader valve
is factory installed. A service port cap is supplied to protect the
schrader valve from contamination and assure a leak free
seal.
SUCTION LINE (BALL TYPE) SERVICE VALVE
(VALVE OPEN)
FIGURE 17
SCHRADER CORE
SERVICE PORT
SERVICE
PORT
CAP
STEM CAP
FROM INDOOR COIL
TO COMPRESSOR
STEM
USE ADJUSTABLE WRENCH
ROTATE STEM CLOCKWISE 90
_
TO CLOSE
ROTATE STEM COUNTER-CLOCKWISE 90
_
TO OPEN
BALL
(SHOWN OPEN)
C − Pumping Down System
CAUTION
Deep vacuum operation (operating compressor
at 0 psig or lower) can cause internal fusite
arcing resulting in a damaged or failed
compressor. This type of damage will result in
denial of warranty claim.
The system may be pumped down when leak checking the
line set and indoor coil or making repairs to the line set or
indoor coil.
1− Attach gauge manifold.
2− Front seat (close) liquid line valve.
3− Start outdoor unit.
4− Monitor suction gauge. Stop unit when 0 psig is reached.
5− Front seat (close) suction line valve.
D − Leak Testing (To Be Done
Before Evacuating)
1− Attach gauge manifold and connect a drum of dry nitro-
gen to center port of gauge manifold.
2− Open high pressure valve on gauge manifold and
pressurize line set and indoor coil to 150 psig (1034
kPa).
3− Check lines and connections for leaks.
NOTE-The preferred method is to use an electronic leak or
Halide detector. Add a small amount of HFC−410A (3 to 5
psig [20kPa to 34kPa]) then pressurize with nitrogen to 150
psig.
4− Release nitrogen pressure from the system, correct any
leaks and recheck.
WARNING
Danger of explosion!
When using a high pressure gas such
as dry nitrogen to pressurize a refriger-
ant or air conditioning system, use a
regulator that can control the pressure
down to 1 or 2 psig (6.9 to 13.8 kPa).
WARNING
Fire, Explosion and Personal Safety
Hazard.
Failure to follow this warning could
result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause damage by fire
and / or an explosion, that can re-
sult in personal injury or death.
E − Evacuating the System
1− Attach gauge manifold. Connect vacuum pump (with vac-
uum gauge) to center port of gauge manifold. With both
manifold service valves open, start pump and evacuate
indoor coil and refrigerant lines.
IMPORTANT
A temperature vacuum gauge, mercury vacuum
(U−tube), or thermocouple gauge should be used.
The usual Bourdon tube gauges are not accurate
enough in the vacuum range.
IMPORTANT
The compressor should never be used to evacu-
ate a refrigeration or air conditioning system.
2− Evacuate the system to 29 inches (737mm) vacuum. Dur-
ing the early stages of evacuation, it is desirable to stop
the vacuum pump at least once to determine if there is a
rapid loss of vacuum. A rapid loss of vacuum would indi-
cate a leak in the system and a repeat of the leak testing
section would be necessary.
3− After system has been evacuated to 29 inches
(737mm), close gauge manifold valves to center port,
stop vacuum pump and disconnect from gauge man-
ifold. Attach an upright nitrogen drum to center port of
gauge manifold and open drum valve slightly to purge
