1-21
Pioneer Gold 3.00 Controller Technical Guide
Heat Only Operation
Entering Water Temperature rises above the Heating Entering
if the compressor is enabled, the call for the compressor will
the WSE 24VAC output will be enabled, sending the hot loop
water through the air coil to utilize “free heating”. Once the
Entering Water Temperature falls below the Heating Entering
adjustable), the WSE will be disabled, and compressor heating
will be utilized.
NOTE: The max allowable Entering Water Temperature
as listed in the WH/WV operating limits is 90°F
when the unit is in heating mode.
minutes), the WSE valve will disable. Following a 60 second
delay, the unit will resume normal compressor heating operation
until the heating input is removed. When this happens, the
controller will display a Waterside Economizer Failed alarm.
Dual Operation
The Entering Water Temperature is monitored according to
the demand required (heating or cooling), as described in its
corresponding mode above.
Dehumidication Operation
24 VAC is removed.
active anytime the “DH” input is receiving 24 VAC, regardless
of a demand for heating or cooling. Default is non-priority, where
Fan Speed Dehumidication
to the cooling sequence of operation, with the exception that
lieu of high/cooling speed (low speed for discrete speed ECMs,
Mode.
If a WSE is present, and the Entering Water Temperature falls
below the Cooling Entering Water Temperature Setpoint (default:
as described in the Waterside Economizer Operation section
(page 1-20).
For Freeze Protection, the Leaving Water Temperature will
be monitored, and the unit will be protected according to the
selected setpoints.
Hot Gas Reheat Dehumidication
The compressor is enabled at full capacity “Y2” when
dehumidification mode is enabled. The supply fan low
are enabled. If the unit is equipped with WSE, the Entering Water
Temperature Setpoint for WSE transition is ignored, and freeze
protection is still monitored. The Hot Gas Reheat Solenoid will
(one minute each).
For Freeze Protection, the Leaving Water Temperature will
be monitored, and the unit will be protected according to the
selected setpoints.
requires Cooling or Heating, the Cooling or Heating calls will be
then requires Cooling Mode, the controller will disable reheat and
Control Temperature Sensor then requires Heating Mode, the
controller will disable reheat and disable the Reversing Valve,
entering Heating Mode.
If the controller is transitioning from Cooling Mode directly to
priority, the compressors will remain enabled, reheat will be
enabled, and the supply fan will stage down.
Additional Feature Sequences
Outdoor Air Damper Operation
CO
2
Control Override
As the CO
2
(Space or Return Sensor) rises above the CO
2
Setpoint
be sent to the outdoor air damper to modulate open, and a General
Alarm will be displayed. As the CO
2
falls below the CO
2
Setpoint
outdoor air damper will be removed.
SEQUENCE OF OPERATION
Thermostat Controlled Waterside Economizer and Dehumidication
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