Page 13
13HPD SERIES
Leak Test Line Set and Indoor Coil
After completing the leak testing of the line set and indoor
coil as outlined in figure 10, proceed to
Evacuating Line Set
and Indoor Coil
on page 14.
IMPORTANT
The Environmental Protection Agency (EPA) prohibits
the intentional venting of HCFC refrigerants during
maintenance, service, repair and disposal of appliance.
Approved methods of recovery, recycling or reclaiming
must be followed.
IMPORTANT
Leak detector must be capable of sensing HCFC
refrigerant.
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal injury
or death.
TO VAPOR
SERVICE VALVE
HCFC−22
MANIFOLD GAUGE SET
OUTDOOR UNIT
HIGH
LOW
NITROGEN
A
With both manifold valves closed, connect the cylinder of HCFC−22 refrigerant to the center port of the manifold gauge set. Open the valve
on the HCFC−22 cylinder (vapor only).
B
Open the high pressure side of the manifold to weigh in a trace amount of HCFC−22 into the line set and indoor unit.
A trace amount is a
maximum of two ounces (57 g) refrigerant or three pounds (31 kPa) pressure.
Close the valve on the HCFC−22 cylinder and the valve on
the high pressure side of the manifold gauge set. Disconnect the HCFC−22 cylinder.
C
Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
D
Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set
and the indoor unit.
E
After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak
detector
.
F
After leak testing disconnect gauges from service ports.
After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the
following procedure to test for leaks:
A
Connect an HCFC−22 manifold gauge set high pressure hose
to the vapor valve service port.
NOTE
Normally, the high pressure hose is connected to
the liquid line port. However, connecting it to the vapor port
better protects the manifold gauge set from high pressure
damage.
B
With both manifold valves closed, connect the cylinder of
HCFC−22 refrigerant to the center port of the manifold gauge
set.
NOTE Later in the procedure,
the HCFC−22 container will be
replaced by the nitrogen
container.
1
CONNECT GAUGE
SET
2
TEST FOR LEAKS
A
B
DIGITAL SCALE
Figure 10. Leak Test