Alpha E-Tec 33 Hybrid - External Heat Pump Dimensions and Connections; Grundfos UPM4 Pump Settings

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574
185
12
558
70
845
35
8
126
350
311
285
44
745
25
681
F
R
F R
MHT
RHT
Alpha E-Tec Hybrid - General Information
4.3 EXTERNAL HEAT PUMP DIMENSIONS AND CONNECTIONS
R .... Return to heat pump = 28mm
F .... Flow from heat pump = 28mm
The heat pump unit is supplied with Flow
and Return isolating valves and anti-
vibration mounts.
Fig. 4.2
4.3 GRUNDFOS UPM4 PUMP SETTINGS
The indoor boiler is equipped with a low power consumption pump with variable speed regulator, the pump also works for the
heat pump, since the two generators are placed in series with each other.
The pump speed is set using the parameters present in the Assistance Menu -> System Definition of the Control panel.
For the hybrid heat pump to work properly, it is not allowed to drop below the minimum value indicated in Fig. 4.3.
In domestic hot water mode, the pump always runs at full speed. The pump speed settings should not be adjusted.
NOTE: The boiler is supplied with the by-pass closed.
For correct operation of the system, the boiler by-pass must be kept closed.
It is essential for correct operation that a branch of the system always remains open; otherwise it will be required to
install an external by-pass (especially in the case of zone valves or thermostatic valves on the radiators) the purpose
is to allow the antifreeze function to be carried out (which occurs when the pump is restarted).
For proper system operation, make sure that the minimum flow rate in operating conditions never drops below 500 l/h.
An inline filter must be fitted in the return to the heat pump.
Treating the system water allows you to prevent problems and maintain the function and efficiency of the boiler over time.
Chemical treatment of the thermal system water, must be in compliance with the BS 7953.
NOTE: To ensure correct operation of the heat pump a minimum water content in the system is required, which must be 20
litres for all kinds of systems.
So attention must be paid to the systems spread over several zones, where the water content available to the unit changes
continuously.
MHT ..... Flow from heat pump
RHT ..... Return to heat pump
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