Primo HE - Manual

workeD exAMple The

workeD exAMple The example below is for a G1⁄2 temperature & pressure relief valve with a discharge pipe (D2) having 4 no. elbows and length of 7m from the tundish to the point of discharge. From tABle 2; Maximum resistance allowed for a straight length of 22mm copper discharge pipe (D2) from G1⁄2 temperature & pressure valve is 9m. Subtract the resistance for 4 no. 22mm elbows at 0.8m each = 3.2m. Therefore the maximum permitted length equates to: 5.8m. As 5.8m is less than the actual length of 7m therefore calculate the next largest size. Maximum resistance allowed for a straight length of 28mm pipe (D2) from G1⁄2 temperature & pressure valve equates to: 18m. Subtract the resistance for 4 no. 28mm elbow at 1.0m each = 4m. Therefore the maximum permitted length equates to: 14m As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory. wArninGs The outlet from the temperature & pressure relief valve must not be used for any other purpose. This also applies to the expansion relief valve. No other valve is to be fitted between the cold water combination valve and the cylinder. The temperature & pressure relief valve must not be removed in any circumstances. Any of the above will totally invalidate the guarantee. 16

3.13 electricAl connection The electrical installation must be in accordance with the current I.E.E. wiring regulations. protecH electronic Anti-corrosion systeM (st 100 models only) iMportAnt: The ProTech anti-corrosion system MUST be permanently connected to a fused non-switched 240V electricity supply see FiG 3.11. Anode circuit L 1 N Electronic anode FiG. 3.11 240V~ The ProTech system, an exclusive solution, is an electronic anti-corrosion protection system which ensures maximum longevity of the appliance, regardless of water quality. The electronic circuit creates a difference in potential between the hot water tank and the titanium electrode, thereby guaranteeing optimum protection of the tank and preventing corrosion. To ensure the proper operation of the protection system, it Must Be perMAnently connecteD to A FuseD non-switcHeD 240v, 3A electricity supply even in the event of shut-down of the system. To prevent risk to the appliance’s lifespan when disconnecting the protection system for an extended period of time, it is necessary to drain the appliance beforehand. In addition to the 240V network, the electronic circuit is also connected to the tank, which is to be protected, and to the titanium protection electrode, inForMAtion For tHe enD user Proper operation of the protection system is shown by a continuous green L.E.D, indicating that the circuits terminals are being supplied with electricity. In the event of failure, a red L.E.D. indicates that there is a short-circuit between the electrode and the cylinder tank, that one of the leads (tank or electrode) is disconnected or that there is no water in the cylinder. Your appliance is thus properly protected when the green L.E.D. is illuminated and the red L.E.D. is off. Should this not be the case, please contact your installer. 17