Victorum Exhaust Air Heat Pump Installation Guide
89
Victorum EAHP UFH ESBE
electronic mixing valve
Setting the differential by-pass valve
Setting the differential by-pass valve is essential in ensuring the Heat Pumps internal circulating pump
has a clear circuit and does not dead head. This would lead the Heat Pump to overheat and damage
the pump.
The by-pass valve is pre-plumbed on the tank and can be located using the image below as a
reference.
To carry out rapid adjustment of the by-pass valve it is possible to use the following method:
1. The system must be operating in heating mode and the corresponding zone valve must be fully
open.
NOTE: 1) The DHW zone valve MUST be closed during this process.
2. Set the by-pass valve to its maximum value (0.5 bar).
3. Fully close the ESBE mixing valve, using the manual feature (pull out control knob & rotate the
valve manually).
NOTE: 2) It may be necessary to wait until the system begins to warm up before continuing.
4. Gradually open the by-pass valve, by rotating the red control knob. When the hot water is felt to
be flowing through the by-pass circuit, stop opening the by-pass valve. Use a thermometer or
your hand to detect the hot water flowing through the by-pass circuit.
5. As soon as a rise in the temperature is noted, open the ESBE mixing valve again and check that
the hot water stops flowing through the by-pass circuit.
6. If the water does not flow through the by-pass then it is set correctly. Mark the final position on the
red plastic casing, using a permanent marker, to indicate the final position for future repair and/
or maintenance of the system.
0.1- 0.5 bar
0.1
0.2
0.3
0.4
0.5