Leak Test Line Set And Indoor Coil - Lennox 13ACD-018-230 Installation Instructions Manual

Catalog
Capacity
Number
018 10W95
024 98M12
030 11W00
036 98M78
042 10W86
048 98M14
060 98M15
Table 3. Indoor Fixed Orifice Kits

Leak Test Line Set and Indoor Coil

After completing the leak testing of the line set and indoor
coil as outlined in Figure 9, proceed to Evacuating Line Set
and Indoor Coil on Page 13.
1
CONNECT GAUGE SET
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
container.
IMPORTANT —
must be capable of sensing
HCFC-22 refrigerant.
2
TEST FOR LEAKS
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 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.
Leak detector must be capable of sensing HCFC-22 refrigerant.
Page 12 of 16
Part
Drill Size
Number
100484-07 0.055
100484-12 0.062
100484-16 0.067
100484-24 0.076
100484-28 0.080
100484-36 0.089
100484-45 0.099
the nitrogen
Leak detector
NITROGEN
Figure 9. Leak Test
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.
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.
LOW
B
SERVICE VALVE
HCFC-22
DIGITAL SCALE
IMPORTANT
Issue 1720
IMPORTANT
WARNING
HIGH
MANIFOLD GAUGE SET
OUTDOOR UNIT
A
TO VAPOR
506694-01