28
Sealed System
Fig. 25 - Rayburn 680KCD C/F shown
THE BY-PASS BALANCING VALVE SHOULD BE OF AN AUTOMATIC TYPE AND MUST
HAVE AT LEAST 2.5 METRES OF 28mm PIPE EACH SIDE BETWEEN IT AND THE
COOKER.
THE BY-PASS LOOP MUST NOT BE INSULATED.
SHOULD THE PUMP BE FITTED TO THE RETURN SIDE, THEN THE PRESSURE GAUGE
AND EXPANSION VESSEL ARE FITTED ADJACENT TO THE SUCTION SIDE OF THE
PUMP. THE SAFETY VALVE REMAINS AS SHOWN ON THE FLOW PIPE.
