Generac Power Systems IM Series - Manual (Page 9)

d. Battery voltage is delivered through a diode
(housed in the Choke Module) and to the Wire 14 cir­
cuit. Wire 14 is now electrically hot, to operate (a) a
Fuel Pump (FP), (b) a Choke Heater (CH), and (c)
an "Engine Run" lamp on the optional remote panel.
3. Control Relay (CR2) energizes, its nonnaiiy-closed
contacts open and the Wire 18 circuit is effectiveiy iso­
lated from frame ground. Ignition can now occur, since
that circuit Is now open to ground.
4. With automatic choking, and with fuel flow and ignition
available, the engine will start.
5. Engine oli pressure buildup opens the Low Oil Pres­
sure Swritch (LOP).
Circuit Condition- Startup and Running
C
When engine fires and starts, the operator will release
the Start/Stop Switch. Circuit condition may then be
described as follows:
1. When a-c output from the generator's Battery Charge
Winding reaches approximately 9-12 volts a-c. Control
Relay (CR1) energizes and its normally open contacts
close, to deliver battery voltage to the Wire 14 circuit (Fuel
Pump and Choke Heater actions continue).
2. The Starter Contactor (SC) and Control Relay (CR2)
circuits to ground are opened.