$99198$

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CLASS PROJECT#$2$

DRAW A LADDER DIAGRAM TO PERFORM THE FOLLOWING.

UPON CLOSING OF THE SPST SWITCH$($FIRST IN CIRCUIT$)$ AND PROVIDED THAT THE COOLING TSTAT AND SAFETIES ARE CLOSED, $"$CR$"$ RELAY WHICH IS IN SERIES WITH THE ABOVE CONTROLS WILL BECOME ENERGIZED. THE $"$LLS$"$ RELAY IS TO BE WIRED IN PARALLEL WITH $"$CR$".$

THE EVAP. FAN RELAY IS TO BE WIRED IN PARALLEL WITH THE ABOVE CIRCUIT AND IS TO OPERATE WHEN THE COOL SWITCH IS MADE.

ALL COMPONENTS ARE IN THE $24$ VOLT CONTROL CIRCUIT.

MATERIAL LIST

$1$ COOLING RELAY

CR

$1$ SPST SWITCH

c$/$SW

$1$ HIGH PRESSURE SWITCH HP

$1$ LOW PRESSURE SWITCH LP

$1$ LIQUID LINE SOLENOID LLS

$1$ COOLING THERMOSTAT TC

$123024$ VOLT IRON CORE TRANSFORMER X$/$FORM

$1$ EVAP FAN RELAY EFR

Vitul