AM, EM, AQ, BA, ASW - IOM
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Ing.Ji
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5.9.4 Preheating in Accumulation Vessel of the Heating System and Electric
Afterheating
This scheme is also universally usable for all heat pumps. It is especially suitable for
reconstructions with pre-installed electric or gas heater of DHW. It is not suitable for high
demand of DHW. The DHW is preheated in the accumulation vessel with large-area copper
heat exchanger to a temperature nearing the actual temperature of heating water.
Subsequently, accumulation of through-flow afterheating to required temperature is performed.
Typical area of exchanger is 4 to 5m2. This kind of heating does not cause bacterial risk in the
low-temperature part of heating. This system requires no control, it is self-regulating.
DHW outlet
tap water inlet
electric DHW tank
optional circulation return
heat source
heating system outlets
copper/stainless steel heat exchanger 4 – 5m
2
5.9.5 Safety / PT relief valve outlet
Safety overpressure (and overtemperature) relief valve must be installed on each DHW tank.
During charging of the DHW, water leak occurs from safety valve due to water thermal volume
expansion.
Therefore draining to the waste must be provided in the area of DHW tank
installation
.