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FIGURE 11
SUCTION LINE SERVICE VALVE (VALVE OPEN)
SCHRADER
VALVE
SERVICE PORT
SERVICE PORT
CAP
INSERT HEX
WRENCH HERE
INLET (TO
INDOOR COIL)
OUTLET (TO
COMPRESSOR)
STEM CAP
SCHRADER VALVE OPEN
TO LINE SET WHEN VALVE IS
CLOSED (FRONT SEATED)
SERVICE
PORT
SERVICE PORT
CAP
RETAINING RING
STEM CAP
INSERT HEX
WRENCH HERE
SUCTION LINE SERVICE VALVE (VALVE CLOSED)
(VALVE FRONT
SEATED)
INLET (TO
INDOOR COIL)
OUTLET (TO
COMPRESSOR)
Suction Line (Ball Type) Service Valve(5 Ton Only)
A ball-type full service valve is used on 10ACC 5 ton
units. These suction line service valves function the
same way, differences are in construction. Valves are
not rebuildable. If a valve has failed it must be replaced. A ball
valve is illustrated in figure 12.
The ball valve is equipped with a service port. A schrader
valve is factory installed. A service port cap is supplied to pro-
tect the schrader valve from contamination and assure a
leak free seal.
SUCTION LINE (BALL TYPE) SERVICE VALVE
(VALVE OPEN)
FIGURE 12
SCHRADER CORE
SERVICE PORT
SERVICE
PORT
CAP
STEM CAP
INLET
(FROM INDOOR COIL)
OUTLET
(TO
COMPRESSOR)
STEM
USE ADJUSTABLE WRENCH
ROTATE STEM CLOCKWISE 90
_
TO CLOSE
ROTATE STEM COUNTER-CLOCKWISE 90
_
TO OPEN
BALL
(SHOWN OPEN)
IV - CHARGING
A - 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.
B - 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-If electronic leak or Halide detector is used, add a
small amount of R-22 (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.
