8 CONNECTION 8.1 Connecting CH installation 1. Flush the CH system thoroughly (please refer to current Standard Codes of Practice). 2. Fit the flow and return pipes to the isolation valves. 3. All pipes must be fitted unstressed in order to prevent the pipes from ticking. 4. Existing connections must not be twisted, in order to avoid leakages. Make sure the compression fittings are thightened thoroughly to prevent leakage. 8.1.1 The CH system should be equipped with: A drain tap in the return pipe immediately below the appliance. A drain tap at the lowest point(s) of the installation. A non return valve, if pipes run upwards at a short distance from the appliance.
This avoids the occurrence of thermosyphon effect during DHW operation mode. 8.1.2 Thermostatic radiator valves If all radiators are equipped with thermostatic or radiator valves, an auto bypass must be fitted in order to guarantee minimum water circulation. The auto bypass must be as far as possible from the appliance in order to prevent overheating of the appliance. 8.1.1 Weather compensation and heating DHW cylinder on hot water priority or W system When connecting a Compact HRE to an indirectly heated DHW storage cylinder the folowing parts can be ordered: DHW storage cylinder sensor (art. nr. 065.117) Diverter valve 230V (art. nr.
092.647) Connect the DHW storage cylinder and diverter valve accourding to the diagram. Remove the loop in 9 – 10 to connector X4. Connect the diverter valve to connector X2 and connect the DHW storage cylinder sensor or thermostat to connector X4 according to the electrical diagram (See chapter 13). Electrical diagram indirectly heated DHW storage cylinder C. Boiler D. DHW storage cylinder E . Radiator F. Expansion vessel G. Pressure relief valve 3 Bar H. Diverter valve I. DHW storage cylinder sensor or thermostat 8.1.2 Floor heating For effective operation of the DHW supply any undesired circulation through the appliance as a result of a second pump in the CH circuit must be avoided.
Connect the floor heating system in a hydraulically neutral manner to the appliance, or equip the CH circuit with an electric shut-off valve or check valve to prevent flow through the appliance when there is no CH request for heat. Connection diagram for floor heating A. Boiler B. Pump C. Floor heating valve D. Non return valve (spring operated) E. Electrical valve 230 V AC F. Radiators G. Room thermostat H. Maximum thermostat Intergas Heating Ltd 24