Hamworthy QAA73.210, Installation, Commissioning And Servicing Instructions

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HAMWORTHY HEATING LTD QAA73.210
Programmable Room Unit
500001305/B
Minimum DHW temperature setpoint (HW MN):
Function for limiting the minimum settable nominal setpoint of the d.h.w. temperature.
Note: A d.h.w. setpoint minimum (TBWmin) of a BMU transmitted via OpenTherm is given priority and replaces
that of the room unit (setting 130).
Legionella function (L FCT):
The legionella function ensures that the d.h.w. in the storage tank will periodically be raised to a temperature
higher than nominal setpoint.
The setting activates or deactivates the legionella function. Entry:
OFF Function inactive
Weekly ON: Function is activated every Monday morning when d.h.w. is heated up for the first time and lasts
a maximum of 2.5 hours. The d.h.w. is heated up to the adjusted legionella setpoint.
Daily Function is activated every day when d.h.w. is heated up for the first time and lasts a maximum of 2.5
hours. The d.h.w. is heated up to the adjusted legionella setpoint.
Notes:
•
If on the starting day of the legionella function, d.h.w. is not heated, or if the function is aborted, it will be
repeated the next day when d.h.w. is heated for the first time.
•
This function is possible only when d.h.w. heating is released by the d.h.w. heating program.
Dwelling time at legionella function setpoint (L TIME):
The setpoint of the legionella function (operating line 92) is maintained for at least the period of time set here.
--- Function deactivated (no dwelling time)
The dwelling time starts as soon as the legionella setpoint is reached.
During the entire dwelling time, the temperature may not fall below the legionella setpoint by more than the set
BMU d.h.w. switching differential. The legionella function is terminated when this criterion is met.
Setpoint of the legionella function (L TEMP):
The setpoint of the legionella function is an adjustable temperature level to which the d.h.w. temperature is raised
when the legionella function is activated.
The setting changes the d.h.w. setpoint during the period of time the d.h.w. is heated up as a result of the
legionella function.
4.7 Configuration (CONF)
TSP DHW enable (HW PR)
The setting activates or deactivates time switch program.
0: DHW OFF
1: DHW always ON
2: DHW time switch program active
Cooling enable (COOL)
The setting activates or deactivates the cooling function
Default parameters (RESET)
All parameters can be reset to their default values.
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