EC POWER XRGI 20G-TO, Manual

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60
Version 1.0 - 2012 Manual XrGi 20G-To
Installation diagram 4
Fig. 3.21.
3.4.4. Transmitting heat to the consumer side
3.4.4.1. overflows
3.4.4.2. Hot water production
Stable and low return temperatures (below 65 °C) are essential for an economic an reliable operation of XRGI systems. Over-
flows, short circuits and bypasses must thus be avoided.
In the worst case, high return temperatures are taken to mean that the storage tank is full, and the system will switch off until
electricity and heat conditions allow it to restart.
Overflows should be limited and fitted with temperature sensors for reasons of frost protection. When this is done only a limited
amount of water prevents freezing when there is a risk of frost.
Overflows for hydraulic reasons (e.g. differential pressure free distributors) are harmful to today's energy systems in principle.
They cause circulating pumps to use current unnecessarily, increase line losses, reduce storage tank performance and make
the heat sources less efficient. They must therefore be replaced with suitable variable flow hydraulic systems.
Hot water storage tanks cause high return temperatures, particularly towards the end of the loading process. For this reason
the charge pump should be switched off before the return temperature rises significantly. The loading pump will also cause
excessive return temperatures if it pumps too powerfully.
If the existing control system does not end the loading process in due time, a return temperature control valve should be fitted.
XRGI n
XRGI 2
XRGI 1
sToraGe ConTrol sToraGe ConTrol
Heat installation
return
header Flow
header
sToraGe TanK sToraGe TanK
additional
heat source
Temperature sensor
Signal cable for sensor
Pump
Valve (manual)
3-way valve
Regulator
Heat consumption
Installation pipe
Q-Network Cable (heat circuit)
Q-Network Cable (control circuit)