
4
|
Components
Service manual
248
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05
T
t
UiH
UiL
T
Period of time of complete cycle
t
Period of time of high‑level input voltage
U
IH
High‑level input voltage
U
IL
Low‑level input voltage
d
Duty cycle (t/T x 100) [%]
▪
When using any equipment that is capable to measure the duty cycle, the
measured signal MUST show profile A (see illustration below). The PWM signal
(duty cycle) is disproportional to the water pump speed (flow rate) in the range
of 10% to 84% and the speed (flow rate) remains at its maximum value when the
PWM signal (duty cycle) is below 10%.
a
b
a
Pump speed
b
PWM signal (duty cycle) [%]
Is the measured PWM signal correct?
Action
Yes
Replace the water pump, see
No
Continue with the next step.
15
Unplug the water pump connector X25A and measure the PWM signal
between pins 1‑2 on the hydro PCB. The measured signal MUST be as
mentioned in the previous step.
Is the measured PWM signal correct?
Action
Yes
Replace the PWM signal harness
between the water pump and the hydro
PCB, see
No
Perform a check of the hydro PCB, see
4.23.2 Repair procedures
To remove impurities from the water pump
Prerequisite:
248].
1
Remove any impurities or objects that may block the water pump.
2
Install the water pump, see
draft – 31/05/2022 15:53
Содержание EBLA04E V Series
Страница 322: ...14 14...
Страница 323: ......
Страница 324: ...draft 31 05 2022 15 53 ESIE22 09 2022 05 Copyright 2022 Daikin Verantwortung f r Energie und Umwelt...