Hamworthy QAA73.210, Installation, Commissioning And Servicing Instructions

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HAMWORTHY HEATING LTD QAA73.210
Programmable Room Unit
500001305/B
Note:
•
The function is not active in operating mode "Continuously Comfort temperature"
•
To give consideration to the building ’ s thermal dynamics, the outside temperature will be attenuated
Gain factor of room influence (KORR):
Defines the influence of room temperature setpoint deviations on the controlled system. The room influence can
be activated and deactivated (operating line 75).
Changing this setting has the following impact:
Increase: Authority of room influence will increase
Decrease: Authority of room influence will decrease
The following example shows how and according to which formula the room temperature setpoint will be
corrected.
Room temperature setpoint :
TRw = Actual room temperature
TRx = 22°C
Correction factor KORR = 8
TRwk = TRw + KORR/2 (TRw - TRx) TRwk = 20 °C + 4 (20 °C – 22 °C) = 12 °C
KORR Constant for room influence
TRx Actual value of the room temperature
TRw Room temperature setpoint
TRwk Room temperature setpoint (readjusted)
As the example shows, if the room temperature is 2 °C too high, the room influence temporarily shifts the room
temperature setpoint down to a level of 12 °C.
Note: KORR works only if the room temperature influence is acti-
vated.
Type of building construction (BUILD):
Enables the control system's rate of response to be matched to the type of building construction.
When the outside temperature varies, the room temperature changes at different rates, depending on the build-
ing's thermal storage capacity. The above setting ensures that the generation of the composite outside tempera-
ture will be matched to the type of building construction. Also refer to "Composite outside temperature".
5…10 Heavy building structures:
The room temperature will respond slower to outside temperature variations
1…5 Light building structures:
The room temperature will respond quicker to outside temperature variations
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