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4. Reinstall the filters, taking note of
correct orientation with regard to
airflow.
5. If necessary, close the filter access door
and press the fastener clip firmly until
locked into position.
Duct Connection
Attach duct to flanges provided on the unit.
Use a properly sized duct transition to
connect supply duct to unit supply air
opening. The installer is responsible for
sealing ducts to the flanges to prevent air
leaks.
Intake air enters the side of the WH/WV
Series units, where the air filters are located.
The left or right hand return depends on
feature selected when ordering the units.
Ductwork must be sized in accordance with
the ASHRAE Handbook. Ductwork must be
installed in accordance with NFPA Standard
90A.
When attaching duct to the unit, use a
flexible/compressible material rated for duct
connections. A three inch flexible connector
for both return and supply duct connections
is recommended.
Waterside Economizer
An optional cooling and pre-cooling
waterside economizer coil is factory
installed upstream of the evaporator coil.
Factory tested and installed water piping kit
includes an on/off waterside economizer
valve.
The waterside economizer circuit operates in
either “WSE” or “Mechanical Cooling” only
modes.
During waterside economizer only mode of
operation water is 100% diverted through
the waterside economizer coil via an internal
3-way valve.
During mechanical cooling only mode of
operation water flows around the waterside
economizer coil with the waterside
economizer valve fully closed. The water
passes only through the refrigerant-to-water
heat exchanger.
Waterside economizer coil condensate
drains into unit drain pan. See the previous
section on condensate drain piping.
Mineral content of the 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 must 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 operation is
configurable between 45-60°F (all 1°
increments) via dip switches (Pioneer
Expansion Board) or programming menus
(Pioneer Gold).
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