Startup; Supply Fans - AAON WH Series Installation Operation & Maintenance

Waterside economizer
drains into evaporator coil drain pan. See
the previous section on evaporator coil
condensate drain piping.
Mineral content of the condenser water must
be controlled. All make-up water has
minerals in it and as the water is evaporated
in the cooling tower, these minerals remain.
As the mineral content of the water
increases, the conductivity of the water
increases.
Field provided and installed water treatment
program must be compatible with stainless
steel, copper, aluminum, ABS plastic, and
PVC. Batch feed processes should never be
used as concentrated chemicals can cause
corrosion. Never use hydrochloric acid
(muriatic acid) or chlorine as it will corrode
stainless steel.
Units with a waterside economizer coil
require the Pioneer Expansion Board or the
Pioneer Gold controller. The entering water
temperature is monitored by the control
board. Changeover temperature to activate
waterside economizer
configurable between 45-60°F (all 1°
increments) via dip switches (Pioneer
Expansion Board) or programming menus
(Pioneer Gold).
coil condensate
operation is

Startup

(See back of the manual for startup form)
WARNING
Improper installation,
alteration, service or maintenance
can cause
personal injury or loss of life. Startup
and service must be performed by a
Factory Trained Service Technician.
A copy of this IOM should be kept
with the unit.
WARNING
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
During startup, it is necessary to perform
routine checks on the performance of the
unit. This includes checking of the air flow,
the air filters, condenser water flow and
refrigerant charge. Due to the charge-critical
nature of these units, refrigerant pressure
gauges should only be hooked up to the unit
if there is suspicion of an issue within the
circuit.

Supply Fans

WSHP Series units are equipped with direct
drive forward curved plenum supply fan
assemblies that deliver the air volume
specified according to unit size and job
requirements.
adjustment,
property damage,
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