en – Original Instructions
34
Installation, Operation and Maintenance Manual
5.6.5
Autocirc pumps
These pumps are the timer controlled versions of the fix speed models with temperature control,
equipped with a special pump housing for simple under sink installation.
There are two models:
•
e
3
-4F/BAPQC: Fix value temperature controlled (for operation details see section 5.6.3 on
page 33).
•
e
3
-4F/BAPRC: Variable value temperature controlled with adjustable restart temperature
(see the second paragraph of section 5.6.4 on page 33).
Depending on the set position of the timer’s green slider (see point 4 of section 5.5 Setting the
timer on page 32), the pump operation can be controlled either by both the temperature sensor
and the timer (slider is in “
” position), or only by the temperature sensor (slider is in “On” position).
The timer mode will provide the most cost effective method of operation and can be
programmed to run only during the time periods when hot water is most frequently required.
Even during timer controlled operation, the Autocirc will only turn on when the built-in
temperature sensor senses that additional hot water is required at the point of installation.
NOTICE:
The Autocirc will most likely start running immediately and turn off after a few minutes once hot
water reaches the faucet. It will then continue cycling on and off, as required during the
programmed sequence of operation. Do not be concerned if the pump does not begin running
immediately after the pump is plugged in. This just means that there is already hot water at the
hot water faucet and the pump will turn on automatically when the hot water line cools down.
5.6.6
LED light
The standard pump models with control knob, have a green operation light integrated in the
knob. It indicates the main operating modes and the error codes as well, if any is present. This
function may be switched off in some special OEM versions.
Mode indications:
Operating mode
LED light status
Normal operation, the pump is running
Continuous on
Air purge sequence is active
Blinking 200 ms on – 200 ms off – 200 ms on…
Standby mode
Blinking 50 ms on – 1.5 s off – 50 ms on…
For error codes see section 7.2 Error signals on page 38.
Figure 18
5.6.7
Motor protection from overtemperature
In order to protect the electronics inside the pumps from temperatures that are dangerously
high, the pump is equipped with an internal temperature sensor and a self-protecting algorithm.
The temperature is measured directly at the electronics. When the temperature of the
electronics is between 221 and 239 °F (105 and 115 °C), the pump power is continuously
lowered to minimum power and thus the flow of water is also decreasing. If despite the power
regulation the temperature still rises and reaches around 257 °F (125 °C), the pump stops
completely. Once the electronics have cooled down again to around 239 °F (115 °C) the pump
automatically restarts.
