Data Aire gForce Ultra - 2.8 Condensate Drain Piping

gForce Ultra IOM
21
recommended that isolation backdraft dampers be installed on the discharge end of the unit or
somewhere prior to the common plenum to prevent cold discharge air from entering units that may be
on standby. Alternatively, we offer an AireSeal option which keeps the EC fans running at a selectable
speed between 20-50% when the unit is in standby to prevent air from entering the units from the
common plenum. Units are shipped with Electronically Commutated (EC) motors often referred to as
“plug fans”. Fan speed is factory set based on order. Fan speed can be changed in 1% increments
through the Data Alarm Processor (dap4) microprocessor controller, by several different methods. See
the dap4 User Manual for details and recommended settings.
WARNING: Do not operate upflow units without installing a plenum,
ductwork or guard over the fan opening(s) on the top surface of the
cabinet. Ductwork must be connected to the fan(s), or a plenum must be
installed on the top of the cabinet for protection from rotating blower
wheel(s) on upflow units. Risk of high-speed moving parts can cause
injury or death. Disconnect all local and remote electric power supplies
before working in the unit.
NOTE: Seal openings around piping and electrical connection to prevent
air leakage. Failure to do so could reduce the unit’s cooling performance.
Piping
• All refrigerant piping should be is Type L Air Conditioning Refrigeration (ACR) hard drawn
copper pipes. Soft copper is unacceptable.
• When brazing refrigerant lines, an inert gas should be passed through the line at low pressure
to prevent scaling and oxidation inside the tubing. Dry nitrogen is preferred. No soldering
allowed.
• Completely de-burr and clean tube end and inside surface of piping.
• Use only a suitable silver alloy on suction and liquid lines. Limit the flux to the minimum
required to prevent contamination of the joint internally. Flux only the male portion of the
connection, never the female. After brazing, remove excess flux.
• All refrigeration piping materials are subject to changes in temperature and will expand and
contract with temperature change. Installation techniques must allow for expansion and
contraction changes for piping connections, this will prevent stresses which may buckle and
rupture the copper tube piping or joints.
• Proper piping practices should be employed to ensure adequate oil return, even under
minimum load conditions with special consideration given to the size and proper slope of the
tubing coming from the evaporator. See section 2.14 Recommended Line Sizing, Air-cooled
Units for more information on line sizes.
• Tubing returns from the evaporator should be designed so as not to trap oil and to prevent
oil and refrigerant migration back to the compressor during compressor off cycles.