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Quest 185 Cool
Installation, Operation and Maintenance Instructions
11
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5.4 Brazing the Line Set
WARNING!
Polyol ester (POE) oils used with HFC-410A refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept closed as much as possible. Do not remove line set
caps or service valve stub caps until you are ready to make connections.
When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning
system, use a regulator that can control the pressure down to 1 or 2 PSIG.
CAUTION!
Brazing alloys and flux contain materials which are hazardous to your health. Avoid breathing
vapors or fumes from brazing operations. Perform operations only in well-ventilated areas. Wear
gloves and protective goggles or face shield to protect against burns. Wash hands with soap and
water after handling brazing alloys and flux.
To prevent stripping of the various caps used, the appropriately sized wrench should be used and
fitted snugly over the cap before tightening.
Allow braze joint to cool before removing the wet rag from service valve. Temperatures above 250°
can damage seals.
Use silver alloy brazing rods with 5% minimum silver alloy for copper-to-copper brazing. Use 45%
minimum silver alloy for copper-to-brass and copper-to-steel brazing.
WARNING!
Fire, explosion and personal safety hazard. Failure to follow this warning could result in damage,
personal injury or death. Never use oxygen to pressurize or purge refrigeration lines. Oxygen when
exposed to a spark or open flame, can cause fire and/or an explosion, that could result in property
damage, personal injury or death.
Note: There is a service port inside the dehumidifier (on the gas line) and both stub tubes of condensing unit. These
service ports can be used to introduce and release nitrogen during brazing.
CAUTION!
The dehumidifier is shipped from the factory pressurized with a charge of inert gas and with rubber
plugs in the lines. Purge the inert gas from the dehumidifier by removing the rubber plugs in the
liquid and gas lines to release the inert gas before connecting the line set.
Note: If there is no pressure in the dehumidifier when the first plug is removed, check the dehumidifier for damage
and leaks before continuing with the installation.
