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Fig. 8
1. A Buffer Vessel must be fitted if the minimum water volume in the heating system is below the
following volumes:
Ambiflo™ 75 system: Minimum water content = 50 Litres, with all valves which can automatically close
in the system closed, i.e Thermostatic Radiator valves or Proportional valves,
Ambiflo™ 90 system: Minimum water content = 70 Litres, as above,
Ambiflo™ 105 system: Minimum water content = 90 Litres, as above.
2. The heat loss from the 100 litre buffer vessel meets the basic CHESS insulation standards. The buffer
will lose an average of 1.1kW over a 24-hour period.
3. Please refer to the guidelines & recommendation below.
4. Baxi recommend the use of a 100 litre buffer as a general solution for all installations. This is available
either as part of a full system or as an accessory (Fig. 9).
Model(s)
Baxi Ambiflo™ 75
Baxi Ambiflo™ 90
Baxi Ambiflo™ 105
Baxi Ambiflo™
75,90 & 105
Baxi Ambiflo™
75,90 & 105
Fig. 9
5. The average UK air temperature in the winter months is 4°C, with relatively high humidity levels. In
normal operation these conditions cause the Baxi Ambiflo™ Evaporator coil to freeze up periodically.
Under these circumstances the fan is switched off and the heat pump circuit reversed to enable the defrost
phase. Without a buffer, the energy required for defrosting the unit is taken from the heating circuit,
which could lead to a reduced room temperature for short periods. Where a buffer vessel is used, the
Description
Baxi Code
No.
System kit & buffer
5131495
pack
System kit & buffer
5131533
pack
System kit & buffer
5131534
pack
Buffer 100 litres
5131537
Buffer 35 litres
5131503
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