APC NetworkAIR AFX Series: Guide Specifications 35
Water-and glycol-cooled systems. The water/glycol-cooled systems shall
consist of an evaporator section including evaporator coil, blower package(s),
controls and electrical section, compressor(s), and a water/glycol-cooled
condenser section. The condenser shall be stainless steel brazed plate design
and shall be controlled by 2-way (3-way optional) head pressure-regulated
valve(s). Maximum water pressure is 150 psi (1030 kPa).
•Outside heat exchanger (drycooler) for glycol cooled systems only:
The drycooler casing shall be of aluminum, and all structural supports,
coil frame, motor-drive supports, and mounting legs shall be made of
galvanized steel. The drycooler coil shall have copper tubes expanded
into aluminum fins. Headers and connections shall be copper. The coil
shall be pressure-tested and sealed for shipment. The drycooler motors
shall have permanently lubricated, sealed, ball bearings, and internal
overload protection. Motors shall be mounted inside the drycooler
casing for weather protection and wired to a terminal strip in a weather-
proof panel on the unit. The direct-drive, aluminum fan blade and
painted steel hub assembly, shall be protected by a heavy-gauge, vinyl-
coated, steel-wire fan guard. On multiple fan units, each fan section shall
be separated by full-width baffles to prevent bypass air. The drycooler
shall be sized for 95° F (35° C) ambient, and operate on _______ -V,
______ -ph, 60-Hz power.
•Indoor floor mounted drycooler: The indoor floor-mounted drycooler
shall be a draw-through design and include a quiet belt-driven, double
inlet centrifugal blower(s), and a condenser coil with copper tubes
expanded into aluminum fins. Belt(s) shall be sized for 200% of the
system horsepower. All components shall be housed in a corrosion-
resistant, heavy-gauge, steel cabinet to match the evaporator section in
finish and construction, equipped with 1" (25 mm) supply and return air
duct flanges. The drycooler section shall be sized _________° F (° C)
ambient. The drycooler section shall be remotely mounted suitable for
__________ -V, ______ -ph, 60-Hz power.
•Single pump package for glycol cooled systems only: The pump
package shall be comprised of a centrifugal pump in a vented enclosure
with pump starter, separate drycooler fan and pump circuit breakers,
Aquastat, and fan cycling contractor(s) to control the fluid temperature.
The controls shall be mounted in a weather-tight box. An expansion tank
and Airtrol fitting shall be supplied for field installation. The pump size
shall be sized for ______ GPM (L/s) at ________ ft (m) external head,
and operate on _______-V, ______ -ph, 60-Hz power.
•Dual pump package for glycol cooled system only: The dual pump
package shall consist of two centrifugal pumps in an enclosure. Pump
starters, automatic pump switch-over controls, lead-lag pump selector
switch, separate drycooler fan and pump circuit breakers, aquastat, and
fan cycling contractor to control the fluid temperature shall be mounted
in a separate weather-tight box. An expansion tank and airtrol fitting
shall be supplied for field installation. Each pump shall be sized for
______GPM(L/s) at ______ft (m) external head, and operate on
______-V, ______ -ph, 60-Hz power.