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Reversing Valve Operation
For a single stage compressor, the Reversing Valve will enable if
the controller calls for compressor cooling and the compressor has
been operational for a minimum of 5 seconds. This delay allows the
difference in line pressures to assist the reversing valve in changing
positions. Once the mode of operation has been satisfied, and there
is no longer a need for compressor operation, the Reversing Valve
will be reset, and (1 second later) the compressor will be disabled.
For a single compressor 2-stage application, when the first
compressor stage "Y1" is called for, the compressor will first
enable at full capacity "Y2". After 5 seconds, the reversing valve
will change positions, and following an additional 3 seconds, the
compressor will stage down to "Y1" operation.
The default Reversing Valve position is for Heating operation.
The Pioneer Gold energizes its reversing valve for
NOTE:
cooling. If the Pioneer Gold is used in a unit where the
reversing valve energizes for heating, you will need
to install a normally closed pilot relay to control the
reversing valve.
Electric Heat Operation
External Duct Heaters
The W1 Heat Output is designed to be used with duct heaters. It will
be enabled based on the conditions listed below. The duct heaters
will provide any staging, delays, and safety protections required.
If the Electric Heat Configuration is set to Off, then the W1 additional
heat staging output will not be used for external duct heat.
If the Electric Heat Configuration is set to Auxiliary, then the W1
heat output will be used as a supplemental stage of heating to the
compressors. It will be the last stage of heating enabled and the
first stage disabled when maintaining the PID Heating Supply Air
Temperature Setpoint. Auxiliary Heat is enabled when the Supply
Air Temperature is below the active Supply Air Temperature Heat
Setpoint (default: 90°F; range: 55-120°F) minus the Auxiliary Heat
deadband (default: 5°F; range: 1-10°F) and the PID staging and
interstage delays have been met. Additionally, if the compressor
is locked out, the Electric Duct Heat will be used in an attempt to
maintain the active Supply Air Temperature Heat Setpoint.
If the Electric Heat Configuration is set to Emergency, then the W1
heat output will be enabled when compressor heating is locked out
and there is a demand for heating. Emergency heat will not operate
in addition to compressor heating. There is no supply air control.
Pioneer Gold 1.10 & 2.05 Controller Technical Guide
Space/Room Sensor Controlled Electric Heat & WSE
SEQUENCE OF OPERATIONS
Waterside Economizer Operation
On/Off Waterside Economizer (WSE)
Coil Operation
In this operation, the Waterside Economizer (WSE) can be configured
for four modes:
– Default. No condenser water loop function.
Off
–WSE Valve cycles On based on Cooling
Cool Only
Entering Water Temperature Setpoints.
– WSE Valve cycles On based on Heating
Heat Only
Entering Water Temperature Setpoints.
–WSE Valve cycles On based on Entering Water
Dual
Temperature Setpoints of corresponding mode demand.
Cool Only Operation
The WSE will act as the unit's first stage of Cooling. As the
Entering Water Temperature drops below the Cooling Entering
Water Temperature Setpoint (default: 45°F; range: 45-60°F), the call
for the compressor, if enabled, 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". Once the Entering Water Temperature rises above
the Cooling Entering Water Temperature Setpoint plus the deadband
(2.5°F, non-adjustable), the WSE will be disabled, and compressor
cooling will be utilized following a 60 second delay.
If the cooling call has not been satisfied within 10 minutes of
operation, 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 display will signify
the WSE was unable to meet the cooling call.
For Freeze Protection, the Entering Water Temperature will be
monitored.
Heat Only Operation
The WSE will act as the unit's first stage of Heating. As the
Entering Water Temperature rises above the Heating Entering
Water Temperature Setpoint (default: 85°F; range: 80-90°F), 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 hot loop water through the air
coil to utilize "free heating". Once the Entering Water Temperature
falls below the Heating Entering Water Temperature Setpoint minus
the deadband (2.5°F, non-adjustable), the WSE will be disabled, and
compressor heating will be utilized following a 60 second delay.
The max allowable Entering Water Temperature as
NOTE:
listed in the WH/WV operating limits is 90°F when
the unit is in Heating Mode.
1-25
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