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FlowCon By-Pass Assembly 1B95200 - 09/2021 4. For terminal flushing , both forward and back flushing is possible, either through the coil or around the coil, according the BSRIA BG29/2021. Choose your flushing procedure according to local standards and require- ments. FlowCon recommends terminal flush- ing with the pre-installed flushing cap and fit- ting of the PICV insert after proper flushing. For FORWARD FLUSHING , connect hose to blow-down valve ( ) on the strainer, slowly open the inlet bypass handle ( ) by turning it 90° to pressurize the coil. Open the blow-down valve ( ) and forward flush around the coil. Close the bypass handle again, close the blow- down valve and disconnect hose. Alternatively, perform forward flushing through the coil following the above procedure, but connect the hose to the combination p/t drain ( ) on the PICV valve. For BACK FLUSHING , connect hose to blow- down valve ( ) on the strainer, slowly open the inlet bypass handle ( ) to pressurize the coil and turn it 180°. Open the blow-down valve ( ) and back flush around the coil. Close the bypass handle again, close the blow-down valve and disconnect hose. Alternatively, perform back flushing through the coil. If the PICV insert is installed, FlowCon rec- ommends that the PICV is set to 3.0 during back flushing to safeguard it against high water velo- city. Connect hose to blow-down valve ( ) on the strainer, slowly open the outlet bypass han- dle ( ) to pressurize the coil. Open the blow- down valve ( ) and back flush through the coil. Close the bypass handle again, close the blow- down valve and disconnect hose. FlowCon International assumes no responsibility for mistakes, if any, in any printed material. This paper is a supplement to the FlowCon General Instruction Latest release of any FlowCon material is available on www.flowcon.com Page 2 of 4
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FlowCon By-Pass Assembly 1B95200 - 09/2021 PICV Insert and Actuator Installation After proper flushing, set bypass handles to By- pass Operation and drain. Remove the flushing cap on the PICV valve housing and fit the PICV insert with required max. flow setting (please see specific installation instruction for selected insert regarding setting) and fit the selected actuator on the insert. Bypass Operation During Bypass Operation the coil is isolated from the main system. The coil can be serviced after draining, while the main system is still running. Electrically connect the actuator. Please see specific installation instruction for selected ac- tuator. Normal Operation During Normal Operation the coil is an integrated part of the main system. To go from any other op- eration mode and into Normal Operation, slowly open inlet bypass handle 90° to pressurize the coil and then slowly open the outlet bypass handle 90° to put the system in Normal Operation. In Normal Operation the bypass is closed and water will flow through the strainer, into the coil and return through the PICV valve. During this operation, the PICV will balance the flow from closed valve to design flow depending on actual requirements and corresponding to actuator po- sition. Service Exchange of actuator is easily done. Remove ac- tuator and replace without affecting the system or PICV setting. To exchanging of PICV insert, isolated the by- pass by turning the handles to Bypass Opera- tion position, remove the insert and replace with a new pre-set insert. Slowly open inlet bypass handle to re-pressurize the coil and then slowly open the outlet bypass handle to put the system in Normal Operation. This paper is a supplement to the FlowCon General Instruction Latest release of any FlowCon material is available on www.flowcon.com Page 3 of 4
