Zone
Zone
SEQUENCE OF OPERATIONS
Pioneer Gold 1.10 & 2.05 Controller Technical Guide
1-24
Space/Room Sensor Controlled Compressor
Space-Supply Air Reset
Space-Supply Air Cooling Reset reads the Space Temperature and
linearly calculates a Supply Air Temperature Setpoint. This is a
selectable sequence that can be disabled.
NOTE:
Space-Supply Reset is only allowed with 2 or more
stages of capacity control.
Space-Supply Reset is subject to the following setpoints:
Cooling Space Temp High Reset
(default: 75°F; range: 55-85°F)
Cooling Space Temp Low Reset
(default: 72°F; range: 55-85°F)
Cooling Supply Temp High Reset
(default: 57°F; range: 45-65°F)
Cooling Supply Temp Low Reset
(default: 53°F; range: 45-65°F)
Heating Space Temp High Reset
(default: 72°F; range: 55-85°F)
Heating Space Temp Low Reset
(default: 69°F; range: 55-85°F)
Heating Supply Temp High Reset
(default: 100°F; range: 55-120°F)
Heating Supply Temp Low Reset
(default: 90°F; range: 55-120°F)
Cooling
The Supply Air Reset calculation will hold the Cooling Supply Temp
High Reset Setpoint if the space temperature is below the Cooling
Space Temperature Low Reset Setpoint. As the Space Temperature
increases above the Cooling Space Temp Low Reset Setpoint and
toward the Cooling Space Temp High Reset Setpoint, the Supply
Air Temperature Cooling Setpoint calculation will decrease in a
linear fashion toward the Cooling Supply Temp Low Setpoint. The
calculated Supply Air Reset will hold the Cooling Supply Temp Low
Reset Setpoint if the space temperature is above the Cooling Space
Temp High Reset Setpoint.
In the example chart that follows, the Supply Air Temp Setpoint
decreases linearly from 60°F to 50°F as the space temperature
increases from 72°F to 76°F. When the space temperature is outside
of those ranges, the Supply Air Temp Setpoint will remain at the
High or Low values; at 70°F space temperature, the Supply Air Temp
Setpoint will remain at the Supply Temp Cool High Setpoint, 60°F,
and at 78°F space temperature, the Supply Air Temp setpoint will
remain at the Supply Temp Cool Low Setpoint, 50°F.
Heating
The Supply Air Reset calculation will hold the Heating Supply
Temp High Reset Setpoint if the space temperature is below the
Heating Space Temperature Low Reset Setpoint. As the Space
Temperature increases above the Heating Space Temp Low Reset
Setpoint and toward the Heating Space Temp High Reset Setpoint,
the calculated Supply Air Heating Setpoint will decrease in a linear
fashion toward the Heating Supply Temp Low Setpoint. The Supply
Air Reset calculation will hold the Heating Supply Temp Low Reset
Setpoint if the space temperature is above the Heating Space Temp
High Reset Setpoint.
In the example below, the Supply Air Temp Setpoint decreases
linearly from 95°F to 85°F as the space temperature increases from
68°F to 72°F. When the space temperature is outside of those ranges,
the Supply Air Temp Setpoint will remain at the High or Low values;
at 66°F space temperature the Supply Air Temp Setpoint will remain
at the Supply Temp Heat High Setpoint, 95°F, and at 74°F space
temperature the Supply Air Temp Setpoint will remain at the Supply
Temp Heat Low Setpoint, 85°F.
