Rinnai Q85SN Instructions D'installation Et D'entretien page 79

Complaint
Temperature drop of the
DHW (Combi)
temperature drop of the
Solo hot
water with the DHW
cylinders
radiators do not get hot
enough or warming them
up takes too long
Description
1. Flow reducing valve
2. Thermostatic mixing valve incorrectly set. Adjust (by measuring the temperature)
3. DHW power for the boiler is set too low.
1. Synchronising valve
2. Thermostatic mixing valve incorrectly set
3. Hot water temperature too low
4. Hot water power for the boiler is set too
low.
1. Check setting of room thermostat or
RS100
2. Supply water temperature too low.
3. Incorrect choice of installation
4. Installation resistance too high (given an
average T > 36°F the boiler decreases
the load).
Solution
Check flow reducing valve for the correct type
in accordance with the installation instructions
-Check PARA chapter Step No. 43
- Check the functioning and wiring of the
DHW sensor T3.
Check the setting in accordance with
the illustrated DHW cylinder installation
instructions
Adjust by measuring the temperature
Check PARA chapter Step No. 31 or RS100 is
set too low. Check the functioning and wiring
of the DHW sensor T3
Check PARA chapter Step No. 43
See installation and user manual RS100
Check setting PARA chapter Step No. 1 and
increase if necessary
PARA chapter Step No. 2 if necessary change.
- See installation instructions.
- Check / clean water filter check dimensions
of pipes.
- If necessary, increase pump rpm Para 48.
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