Western Electric 407A-4, Instruction Manual

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ElF - Green lamp above DlF "Rectifier Filament " .
E3F - Green lamp above D2F uwater Systemn .
E54F - Green Lamp above DlOF 110s c . -.Amp. Filaments " .
These lamps l ight as s oon as power is supplied
to the control circuit . They are extinguished
only by opening the main dis connect circuit
breaker CB 51P, the b ranch circuit breaker CB 52P,
the a-c contro l ci rcuit b reaker D53F, or a
failure of TlF.
E2F - Red lamp above DlF 11Rect . Fil . " lights when DlF
is 110N11 •
E4F - Red lamp above D2F "Water System" lights when
D2F is 11 ON" .
E 5 5F - Re d lamp above DlOF "Os c . -Amp. Fil.11 lights when
DlOF in "ON" .
E5F - 11Rect. Fil . 11 lights if DlF 11Rect. Fil . 11 is "ON",
S57P is operate d and if D5H is "ON" energiz ing
relay SSH and permitting thermostat to control
the B lower MBlH.
E6F - Green lamp above D3F "Amplifier Filaments 11
lights when the water system is "oNn and the
flow re lay WDlW has operated to energiz e SlF.
E 7F - Re d lamp above D3F "Amplifier Filaments " l ights
when D3F is thrown to "ON" providing the green
lamp is als o lighted.
E8F - "Water System11 lights under same c onditions as
E6F .
E9F - "Amplifier Filaments 11 lights when D3F is "OW'
and has energiz ed the filament contactors S53P
and S59P.
ElOF - 11Rectifier Fil. Delay" lights provided E5F has
lighted and delay relays S 2F and Sl6F have
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