Heating installation automatic electric control system - has timer controlling two normally separate heating circuits for night and day operation

摘要

The heating installation electrical control uses a single timer. This timer (H1) is supplied by a conductor (5). The timer controls contacts which can be connected in resin with a three position control switch (9). This control switch (9) is connected to a conductor (13). The contacts of the timer (H1) can be connected to final (17) and record conduction. The first conduction (17) when connected to to the supply rim of the timer contacts can energise the windings of the day contactor (BJI) and the thermostat T3. The second conductor (19) can when connected to the supply energises the winding of the night contactor (BN1) and the thermostat (T4). Night and day circuits cannot both be energised at the same time with the control switch in the "auto position" they may be energised at the same time if the control switch is timed to "Manual" and both the manual switches (27) and (28) are closed.