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7.5 DHW production
The Remeha Quinta 45 and 65 is supplied as standard with an inbuilt DHW control.
This control, when used in conjuction with the Broag DHW sensor or thermostat,
a three way valve or DHW pump, can provide boosted primary flow temperature
independent of the variable temperature flow for the fully condensing mode.
However it cannot be independantly time controlled and will isolate the HTG system
during the demand period.
NOTE:
For multiple boiler installations the DHW pump option must be used.
On demand of the DHW sensor or thermostat and depending on parameter J
(reference: Par. 6.6.11), the boiler:
- either operates the three way valve diverting flow water from HTG to the calorifier
(Note: please refer to the resistance graph below)
or
- powers the DHW pump and turns off the HTG or boiler pump.
Fig. 10 DHW three way valve resistance graph
The boiler flow temperature is boosted to the DHW set point + DHW control stop set
point (see Par. 6.6.7 and 6.6.10).
When the DHW sensor or thermostat is satisfied the boiler turns off. The control
powers the three way valve from DHW to HTG or turns off the DHW pump and turns
on the system pump (provided there was still a HTG demand. If no HTG demand, the
selected pump will run on for a maximum of 5 minutes).
0
20
40
60
80
100
120
10 20 30 40 50 60
Output (kW)
dP (mBar)
0
500
1000
1500
2000
2500
3000
Flow (l/h)
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