Daikin EHYHBH05AAV3, Service Manual

Page: 74 / 170

Troubleshooting ESIE13-02A
Part 4 – Troubleshooting 74
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1.2.15 Room Temperature Set Point Isn’t Reached or Increases Too Slow
Applicable models EHB*CA, EHV*CA
Error detection
method
Error generating
condition
Supposed causes -
corrective action
(1)
The desired leaving water temperature is the result of several settings (preset values, shift values,
weather dependent curves, modulation). As a result, too high or too low leaving water temperature
could occur which lead to overtemperatures or capacity shortage. By limiting the leaving water
temperature range to adequate values (depending on the heat emitter), such situations can be
avoided.
(2)
The feasible room temperature dependents on the average heat emitter surface temperature. The
average heat emitter surface temperature is determined by the temperature difference between the
inlet and outlet water temperature of the heat emitter.
Possible causes Corrective action
See possible causes of item “2 Possible space
heating capacity shortage at low Ta”. See corrective actions of item “2 Possible space
heating capacity shortage at low Ta”.
The leaving water temperature set point
(weather dependent or fixed) is too low in rela-
tion with the target room temperature set point.
Select the desired leaving water temperature
(1)
in balance with the desired room temperature
(2)
and/or the capacity. Secondly the desired leav-
ing water temperature shall be in relation to the
temperature difference between inlet and outlet
water temperature of the heat emitters (accord-
ing to the design and selection of the heat emit-
ters).