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Hot Gas Reheat Dehumidification
For Hot Gas Reheat Dehumidification,
switch 1, position 9 must be set to "OFF".
Hot Gas Reheat Dehumidification Mode is
enabled based on a 24VAC input to the
"DH" terminal.
Cooling and heating modes are always
priority over dehumidification. Hot Gas
Reheat Dehumidification is only available
when the cooling and heating demands are
satisfied.
The compressor is enabled at full capacity
"Y2" when dehumidification mode is
enabled. The supply fan low speed (if EC
motor) and reheat valve "RH" 24VAC
outputs are enabled. If the unit is equipped
with waterside economizer, the Entering
Water Temperature setpoint will be ignored,
and freeze protection will be monitored.
On/Off Waterside Economizer (WSE)
Coil Operation
As the entering water temperature drops
below the Entering Water Temperature
setpoint, if the compressor is enabled, the
call for the compressor will be removed
once the minimum on time has been
satisfied, and the WSE 24VAC output will
be enabled, sending the cold loop water
through the air coil to utilize "free cooling".
The WSE will act as the unit's only stage of
cooling. If the cooling call has not been
satisfied within 10 minutes of operation, the
WSE valve will disable. Following a delay,
the unit will resume normal compressor
cooling operation until the cooling input is
removed. When this happens, the Pioneer
Silver controller green LED will flash,
signifying the WSE was unable to satisfy the
cooling call.
If the entering water temperature rises above
the Entering Water Temperature setpoint
plus the deadband, the WSE will be
disabled, and compressor cooling will be
utilized.
Maintenance
See back of the manual for maintenance log.
At least once each year, a qualified service
technician must check out the unit. Supply
fans, evaporator coils and air filters must be
inspected monthly.
WARNING
Improper
installation,
alteration, service or maintenance
can
cause
personal
injury
Installation and service must be
performed by a qualified installer.
Keep a copy of this IOM with the unit.
See Startup section for information on air
flow adjustment.
DX Cooling
Set unit controls to cooling mode of
operation with supply fans on. Check the
fans
for
correct
amperage and voltage. Check compressor
operation, rotation, amperage and voltage to
the unit nameplate (check the amperage on
the load side of the compressor contactor).
Check for 24V signal across the reversing
valve terminals.
Condensate Drain Pans
Drain pans will have moisture present and
require
periodic
microbial growth. Cleaning of the drain pans
will also prevent any possible plugging of
the drain lines and overflow of the pan itself.
Cleaning of the drain pans and inside of the
unit must be done only by qualified
personnel.
adjustment,
property
damage,
or
loss
of
life.
operating
direction,
cleaning
to
prevent
49
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