APC NetworkAIR AFX Series: Guide Specifications 33
double-inlet centrifugal type, with forward-curving blades, dynamically and
statically balanced. Each blower shall be independently driven by a high-
efficiency motor. The drive package shall be designed for 200% of the fan
motor horsepower. Minimum bearing life shall be 200,000 L10 hrs. The
motor and blower shall be mounted on a common frame which is isolated
from the vibration of the unit frame. Each blower shall discharge conditioned
air into an insulated static-regain duct located within the dow nflow unit.
Electrical. The electrical system shall conform to National Electrical Code
(NEC) requirements. The control voltage shall be 24 VAC, wired in
accordance with NEC Class 1 requirements. The control circuit wire shall not
be smaller than 18-gauge AWG. Each wire shall end with a service loop and
be securely fastened by an approved method. Control wires more than 6"
(150 mm) shall be color-coded or numbered every 3" (80 mm) for ease of
service tracing. All electrically-actuated components shall be easily
accessible from the front of the unit. Each high-voltage unit shall be
individually protected on all three phases. Main power shall be connected to
a circuit breaker mounted on the electrical panel. The compressor and motor
shall have overload and short-circuit protection. The electrical box shall
include all components and controls required for system operation. An
emergency cool-override manual switch shall be provided with provision for
control using a field supplied thermostat.
•Incoming power is __________V, ______ ph, 60 Hz.
Humidifier. The humidifier(s) shall be self-contained steam-generating
type, factory piped and wired, with disposable cylinder and automatic solid-
state control circuit.
•Capacity: ____________lb/h (g/s).
Reheat. The reheat elements shall be low watt density resistance type, sized
to offset the sensible cooling capacity in the dehumidification mode and shall
be electrically and thermally protected by Safety Agency approved safeties.
•Reheat capacity shall be __________ MBH, _______ kW,
controlled in ________ (#) steps.
Refrigeration system. Each refrigeration system shall consist of a fully
protected scroll compressor, evaporator coil mounted over an insulated
stainless steel condensate pan, adjustable expansion valve, filter–drier, liquid
line solenoid valve, sight glass, receiver, liquid line isolation valve, low
pressure switch and manual reset high pressure switch.
Cooling coil. The evaporator coil shall use the latest heat-transfer
technology, raised lanced-aluminum fins and rifle-bored copper tubes. Coil
end-supports shall be galvanized steel. To enhance dehumidification, the coil
shall be split into two circuits by a microprocessor-controlled solenoi d valve.
An insulated stainless steel drain pan for condensate shall be included.
Air filters. The air filters shall be 30% efficient per ASHRAE Standard
52.1–92, UL Class 2. The full 4" (102 mm) deep, pleated filters shall be
replaceable from the top on downflow units and from the front on upflow
units.