Central Heating Parameters; Outdoor Reset Parameters - Ace Heating Solutions Atlas A050 Operating And Maintenance Manual

4-18 Central Heating Parameters

Table 4.5 displays Central Heat configuration parameters.
Refer to 5-1 CENTRAL HEAT RELATED CONFIGURATION for Central Heat parameter programming.
Parameter
CH enable
CH demand source
CH outdoor reset
CH has priority over LL
CH setpoint source
CH setpoint
CH time of day setpoint
CH off hysteresis
CH on hysteresis
CH 4 mA water temperature
CH 20 mA water temperature
CH modulation sensor
CH P-gain
CH I-gain
CH D-gain
CH hysteresis step time

4-19 Outdoor Reset Parameters

Table 4.6 displays Outdoor Reset configuration parameters.
Refer to 5-2 OUTDOOR RESET RELATED CONFIGURATION for Outdoor Reset parameter programming.
Parameter
CH maximum outdoor
temperature
CH minimum outdoor
Temperature
Low water
temperature
CH minimum water
temperature
Table 4.4 – Honeywell Sola Controller Identification Information
Disable or Enable Central Heating Loop
Source for Central Heat demand
Modulation sensor only: CH loop is controlled only by
selected sensor which provides pump demand, operating
temperature and burner demand.
STAT terminal: the STAT input in the On condition
creates pump demand and it also must be on for burner
demand to exist; if it is off there is no demand
LCI: the Recycle Interlock input in the On condition
creates pump demand and selected sensor provides
operating temperature and burner demand.
Disabled or enable CH outdoor reset
This controls whether a local CH demand has priority
over the control asserted by the LL master, when enabled
as a slave.
Local: Local setpoint is used as CH setpoint.
4-20mA: Remote 4-20mA signal is used as CH setpoint.
Setpoint for normal Central Heat modulation
32 °F to 240 °F (0 °C to 115 °C)
This setpoint is used when the time-of-day input is off
Time Of Day setpoint
32 °F to 240 °F (0 °C to 115 °C)
This setpoint is used when the time-of-day input is on. If
the Outdoor Reset function is inactive then the setpoint is
used as-is. If the Outdoor Reset function is active then
this setpoint provides one coordinate for the shifted
outdoor reset curve.
Differential above setpoint when boiler is turned off
2 °F to 30 °F (1 °C to 16 °C)
Differential from setpoint when boiler is turned on
2 °F to 30 °F (1 °C to 16 °C)
CH setpoint when 4 mA is received from BMS System
CH setpoint when 20 mA is received from BMS System
Sensor for Central Heating modulation
Outlet sensor: Outlet sensor used as CH operating
sensor.
Inlet sensor: Inlet sensor used as CH operating sensor.
S5 sensor: S5 sensor (Header/Outdoor) used as CH
operating sensor.
Proportional term of PID
0-400
Integral term of PID
0-400
Differential term of PID
0-400
Time needed for one step of hysteresis shift, when the off
hysteresis threshold or on hysteresis threshold is shifted
due to a burner on or burn off event. Zero disables this
function.
Table 4.5 – Central Heat Configuration Parameters
-40 °F to 266 °F (-40 °C to 130 °C)
-40 °F to 266 °F (-40 °C to 130 °C)
32 °F to 240 °F (0 °C to 115 °C)
32 °F to 240 °F (0 °C to 115 °C)
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Rev 2.1