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Building Technologies
Modular Heating Controller RMH760B
CE1P3133en
HVAC Products
10 DHW heating
05.02.2007
Main menu > Commissioning > Settings > …
or
Main menu > Settings > DHW > DHW
Operating line
Range
Factory setting
Discharge protection
Yes / No
Yes
During storage tank charging, discharging protection switches the respective charging
pump off if:
DHW plant type
Condition for switching off
Discharging pro-
tection with
DHW 1
DHW 2
Flow temperature
<
[storage tank
temperature* + 1/8 setpoint
increase of DHW charging]
Primary pump
DHW 3
DHW 4
DHW 5
Primary flow temperature
<
[stor-
age tank temperature** + 1/
8
setpoint increase of heat ex-
changer]
Secondary pump
During overrun, discharging protection switches the primary pump off if:
DHW plant type
Condition for switching off
DHW 1
DHW 2
DHW 4
DHW 5
Flow temperature < storage tank temperature**
During overrun, discharging protection switches the secondary pump off if:
DHW plant type
Condition for switching off
DHW 3
Flow temperature < storage tank temperature**
DHW 4
DHW 5
Flow temperature < storage tank temperature**
*
If 2 storage tank sensors are used, the
lower
value will be considered
** If 2 storage tank sensors are used, the
higher
value will be considered
10.8.2 Limitation
of
the
return temperature
With DHW plant types using a primary mixing valve, return temperature limitation can
be configured. This applies to plant types DHW 2, DHW 3, DHW 4 and DHW 6.
DHW 2
DHW 3, DHW 4
DHW 6
TFlPr
PrPu
VlvPr
TRt
31
3
3S
82
VlvPr
TFlSec
Sec
Pu
TRt
31
3
3S83
VlvPr
FlSwi
TFlSec
TRt
313
3S
84
FlSwi Flow switch (optional)
TFlSec Secondary flow sensor
PrPu
Primary pump
TRt
Return sensor
SecPu Secondary pump
VlvPr Primary mixing valve
TFlPr Primary flow sensor
If the return temperature exceeds the limit value, the flow temperature setpoint of the
DHW circuit will be lowered. If the return temperature drops below the limit value, the
reduction of the flow temperature setpoint will be negated again. Limitation operates as
an I-controller whose integral action time can be adjusted.
Settings
Storage tank charging
active
Overrun active
Maximum limitation of
the return temperature