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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.
Before brazing, ensure the system is fully
recovered of all refrigerant. Application of a
brazing torch to a pressurized system may
result in ignition of the refrigerant and oil
mixture. Check the high and low pressures
before applying heat.
To prevent the build-up of high levels of
nitrogen when purging, it must be done in a
well-ventilated area. Purge low-pressure
nitrogen (1 to 2 psig, 6.9 to 13.8 kPa)
through the refrigerant piping during
brazing. This will help to prevent oxidation
and the introduction of moisture into the
system.
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.
Recommended line length is 50' or less. If more than 50'
line set is required, contact Blue Summit.
507787B02
WARNING
WARNING
WARNING
CAUTION
NOTE
Sealing the Unit
Seal the unit so that warm air is not allowed into the cabinet.
Warm air introduces moisture, which results in water blow-
off problems. This is especially important when the unit is
installed in an unconditioned area.
If installed in an unconditioned space, sealant should be
applied around the electrical wires, refrigerant tubing, and
condensate lines where they enter the cabinet.
There must be an airtight seal between the bottom of
the air handler and the return air plenum. Use fiberglass
sealing strips, caulking, or equivalent sealing method
between the plenum and the air handler cabinet to
ensure a tight seal. Return air must not be drawn from a
room where this air handler or any gas-fueled appliance
(i.e., water heater), or carbon monoxide-producing
device (i.e., wood fireplace) is installed.
Use duct tape and/ or Permagum to seal closed any
space around the holes where the drain lines exit the
cabinet. Warm air must not be allowed to enter through
any gaps or holes in the cabinet.
Electrical Connections
Electric shock hazard! - Disconnect all power
supplies before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical
shock.
Run 24V Class II wiring only through specified low
voltage opening. Run line voltage wiring only through
specified high voltage opening. Do not combine voltage
in one opening.
Issue 2336
WARNING
IMPORTANT
WARNING
WARNING
Page 11 of 22
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