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TO VAPOR
SERVICE VALVE
HFC-410A
MANIFOLD GAUGE SET
OUTDOOR UNIT
HIGH
LOW
NITROGEN
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.
A
WITH BOTH MANIFOLD VALVES CLOSED, CONNECT THE CYLINDER OF HFC-410A REFRIGERANT TO THE CENTER PORT OF THE
MANIFOLD GAUGE SET. OPEN THE VALVE ON THE HFC-410A CYLINDER (VAPOR ONLY).
B
OPEN THE HIGH PRESSURE SIDE OF THE MANIFOLD TO ALLOW HFC-410A INTO THE LINE SET AND INDOOR UNIT. WEIGH IN A TRACE
AMOUNT OF HFC-410A.
[A TRACE AMOUNT IS A MAXIMUM OF TWO OUNCES (57 G) REFRIGERANT OR THREE POUNDS (31 KPA)
PRESSURE].
CLOSE THE VALVE ON THE HFC-410A CYLINDER AND THE VALVE ON THE HIGH PRESSURE SIDE OF THE MANIFOLD
GAUGE SET. DISCONNECT THE HFC-410A 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.
LINE SET AND INDOOR COIL
AFTER THE LINE SET HAS BEEN CONNECTED TO THE INDOOR AND OUTDOOR UNITS, CHECK THE LINE SET CON
NECTIONS AND INDOOR UNIT FOR LEAKS. USE THE FOLLOWING PROCEDURE TO TEST FOR LEAKS:
LEAK TEST
A
CONNECT AN HFC-410A MANIFOLD GAUGE SET
HIGH PRESSURE HOSE TO THE VAPOR VALVE
SERVICE PORT.
B
WITH BOTH MANIFOLD VALVES CLOSED, CONNECT
THE CYLINDER OF HFC-410A REFRIGERANT TO THE
CENTER PORT OF THE MANIFOLD GAUGE SET.
1
CONNECT GAUGE SET
2
TEST FOR LEAKS
A
B
NOTE - LATER IN THE PROCEDURE, THE HFC-410A
CONTAINER IS REPLACED BY THE NITROGEN
CONTAINER.
Figure 12. System Leak Test
