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5. Line Set Installation
WARNING
• R-404A itself is not flammable at atmospheric pressure and temperatures up to
176°F (80°C).
• R-404A itself is not explosive or poisonous. However, when exposed to high
temperatures (open flames), R-404A can be decomposed to form hydrofluoric
acid and carbonyl fluoride both of which are hazardous.
• Do not use silver alloy or copper alloy containing arsenic.
• Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of
refrigerant to the line set tubing through the service valve access ports (if using
an electronic leak detector), and then raise the pressure using nitrogen gas
(140 PSIG). Do not use R-404A as a mixture with pressurized air for leak testing.
NOTICE
• Do not open any service valve until the line set installation is complete and leak
tested.
• Ensure that there are no traps and no kinks in the line set.
• Do not coil extra line set.
1) Route the factory line set or appropriate size copper tubing. When field fabricating,
insulate the copper tubes separately. Leave a service loop behind the icemaker to allow
the icemaker to be pulled out for service. See Fig. 8.
Note: • The service loop is not considered an oil trap.
• The maximum line length for the standard line sizes and refrigerant charge is
66' (20 m). With larger line sizes and/or additional refrigerant, the maximum line
length is 100' (30.5 m). For details, see "II.G.4 Line Set Size and Refrigerant
Charge."
2) Remove any extra line set length, then insulate the two copper tubes separately.
3) Remove the Schrader valve cores from the icemaker service valves.
4) Braze the line set copper tubes to the icemaker liquid and discharge line service valves.
NOTICE
• Before brazing, remove the Schrader valve cores from the service valve access
ports.
• When brazing, protect the service valve by using a wet cloth to prevent the service
valve from overheating.
• Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4
PSIG.
