Laars MagnaTherm HTD Series, Инструкция по установке и эксплуатации

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Page 69
HTD
C O N F I G U R AT I O N
NOTE:
By default, the control
sensor is the unit outlet sensor, or
when installed, the system supply
sensor.
8.D.1.a.3 PID Parameters
Note that in most cases, PID parameters will not need to be changed. The PID Parameters Screen allows adjustment
to the following parameters:
• On Hysteresis – The temperature below the set point (Set Point – On Hysteresis) at which the control begins
calculating the PID output to turn on stages.
•OffHysteresis
– The temperature above the set point (Set Point + Off Hysteresis) at which the controller will stop
calculating the PID output and set the PID output to 0 to turn off all stages.
• Proportional Gain – This value is the
corrective action that is proportional to the
error (set point – control temperature).
• Integral Time – This value is applied to the
sum of the error over a period of time.
• Derivative Time – This value is applied to
the rate of change of the error.
8.D.1.b CH2-DHW1-DHW2
Additional heat demands CH2, DHW1 and DHW2 are available, and are set up in the same manner as CH1.
8.D.2 DHW/DHW3
To navigate to the DHW/DHW3 Screen, touch the DHW faucet icon on the Configure Screen.
DHW/DHW3 has all the same parameters as CH1/DHW1 and CH2/DHW2 with one exception. DHW/DHW3 has the
following additional parameter for adjustment:
•DHWOffset – Upon a DHW/DHW3 heat demand, the unit will control the outlet temperature to the DHW Set Point
plus the DHW Offset (set point + DHW
Offset).
For example, with a DHW/DHW3 Set Point
of 140°F and a DHW Offset of 40°F, the
unit will control the boiler/heater outlet
temperature to 180°F (140°F + 40°F) to
satisfy the heat demand.
NOTE: A DHW/DHW3 heat
demand can be initiated by
an aquastat or sensor, see
Section 7.D.3 on page 36