1-20
Pioneer Gold 3.00 Controller Technical Guide
Compressor Operation
Unless an alarm is active, the compressor will enable upon
receiving a 24 VAC input on the “Y1” terminal or upon receiving
a 24 VAC input on the “TH_NS” terminal if in Night Setback
Mode. The water valve/pump terminal will energize right away
when the input is received into “Y1”. If the Supply Fan was not
enabled prior to the compressor call, then the Supply Fan will
enable for 5 seconds before the compressor is started.
Compressor staging up and staging down are subject to the
following setpoints:
• Compressor On Delay
(5 seconds, non-adjustable)
• Compressor Minimum On Time
• Compressor Minimum O Time
• Compressor Interstage On Delay
• Compressor Interstage O Delay
If the unit goes into an alarm, the minimum on time of the
compressor(s) will be ignored and the compressor(s) will be
disabled. All alarms will disable the compressor(s).
Reversing Valve Operation
For a single stage compressor, the Reversing Valve will enable
if the controller receives a 24 VAC input on the “O” terminal
and the compressor has been operational for a minimum of
to assist the Reversing Valve in changing positions. Once the
compressor call is removed, the Reversing Valve will remain in
the same position until the mode change requires it to shift and
(one second later) the compressor will be disabled.
compressor stage “Y1” is called for and the Reversing Valve in
will change positions. Following an additional three seconds, the
compressor will stage down to “Y1” operation.
The default Reversing Valve position is for heating operation,
no 24 VAC input on the “O” terminal. Therefore, in compressor
cooling operation, 24 VAC must be applied to the “O” terminal.
Electric Heat Operation
External Duct Heater(s)
The W1 Heat Output is designed to be used with duct heaters.
The W1 heat output will be enabled whenever the W1 input has
24VAC applied to it. The duct heaters will provide any staging,
delays, and safety protections required. The Electric Heat
Integral Electric Heat (Electric Heat Board)
Integral Electric Heat Inputs and Outputs will be contained within
applied to it, the heat stages will enable and disable according
to its interstage delays.
Waterside Economizer Operation
(WSE)
On/Off Waterside Economizer (WSE)
Coil Operation
In this operation, the Waterside Economizer (WSE) can be
• O: Default. No condenser water loop function.
• Cool Only: WSE Valve cycles ON based on Cooling
Entering Water Temperature Setpoints.
• Heat Only: WSE Valve cycles ON based on Heating
Entering Water Temperature Setpoints.
• Dual: WSE Valve cycles ON based on Entering Water
Temperature Setpoints of corresponding mode demand.
Cool Only Operation
Entering Water Temperature drops below the Cooling Entering
call for the compressor, if enabled, will be removed once the
will be enabled, sending the cold loop water through the air coil to
utilize “free cooling”. Once the Entering Water Temperature rises
above the Cooling Entering Water Temperature Setpoint plus the
compressor cooling will be utilized following a 60 second delay.
minutes), the WSE Valve will disable. Following a 60 second
delay, the unit will resume normal compressor cooling operation
until the cooling input is removed. When this happens, the
Waterside Economizer alarm will signify the WSE was unable
to meet the cooling call.
For Freeze Protection, the Entering Water Temperature will be
monitored.
SEQUENCE OF OPERATION
Thermostat Controlled Compressor, Reversing Valve, and Electric Heat
To Next Page
Loading...
Need help?
General
