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7.4.5 Gas connection
Connect the boiler to the incoming gas in accordance with the requirements of the
Gas supply company. Install the main gas cock near the boiler. The gas connection
is located at the bottom of the boiler. Fit a gas filter in the gas supply piping to avoid
debris in the gas control unit.
NOTE: The boiler is suitable for both natural gas and propane firing.
It is supplied as standard set for natural gas. For propane firing please contact Broag.
7.4.6 System pump
The boiler must be installed on a fully pumped system.
7.4.7 Waterflow
The Quinta series of boilers have no minimum water flow requirement provided the
factory default modulation start point (parameter *) is not raised and the following
conditions are met:
- the two wire modulating controls are used,
- on a pressurised system with the high limit temperature set to flow temperature set
point + 20.
7.5 DHW production
The Remeha Quinta 85 is supplied as standard with an inbuilt DHW control.
This control, when used in conjuction with the optional Broag DHW sensor or
thermostat (not a Broag supply), a 3-way diverting valve* or DHW pump, can provide
boosted primary flow temperature independent of the variable temperature flow for
the fully condensing mode. However it can be independantly time controlled and will
isolate the HTG system during the demand period.
* Note: Because of the boiler water resistance (140 mbar at 20°C ∆T) we advise you
to use a DHW pump for DHW production instead of the 3-way valve.
On demand of the DHW sensor or thermostat and depending on parameter J (reference:
Par. 6.6.11), the boiler powers the DHW pump and turns off the HTG or boiler pump.
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 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).
A Broag high output indirect calorifier can be connected to the Remeha Quinta 85 in
accordance with the schematic sketch shown (see Fig. 10).
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