Briggs & Stratton 01931-0 Installation Manual download pdf (Page 14)

Bri_s& Stratton Power Products Home Generator

Installation Manual

I I

Engine Adjustment

There are regional variances in the composition of natural

gas. Each HSG unit is adjusted at the factory for NG

operation. If the generator output voltage or frequency

measured during initial Start-Up (paragraph #9 on page 13)

is outside the listed ranges, the combustibility of the gas

supplied at the installation site may be substantially different.

To adjust the engine for this difference, proceed as follows.

I. Remove the Air Intake access door.

2. Remove the three M5 sheet metal screws that hold

the control panel wiring cover to the air intake guard

(Figure 13).

_,_ I1_]__'--! _i_:_ lil_lll!_! _lllll_ll

Remove

Access

Plug

3. Remove the six (M5) sheet metal screws that hold the

air intake guard to the engine fan panel.

4. An access hole is visible above the engine fan panel

(see Figure 13). It will be covered with a plug. Remove

the plug to gain access to the adjustment screw.

NOTE: The mixture adjustment screw is the brass slotted

screw in the center of the aluminum boss directly visible in

the access hole.

5. Connect an accurate frequency meter to the load side

of the main circuit breaker (on the back of the control

panel).

6. Ensure that the 15 Amp fuse is installed.

7. Set the generator's main circuit breaker ON.

8. Set the AUTO/OFF/MANUAL switch to MANUAL.

When the engine starts, allow it to warm up for two

minutes.

When the engine speed has stabilized, slowly rotate

the adjustment screw clockwise and/or

counterclockwise until the maximum (peak) frequency

is reached. Normal no load frequency is 62.0 to

62.5 Hz.

10. Turn the service disconnect to the transfer switch off.

The transfer switch will connect to the generator after

a short time delay.

I I. Load generator to rated Natural Gas rating.

12. Connect an accurate frequency meter to the load side

of the main circuit breaker (on the back of the control

panel). Frequency should be above 57.0 Hz.

13. If frequency is below 57.0 Hz, slowly rotate the

adjustment screw clockwise and/or counterclockwise

until frequency is above 57.0 Hz. Reinstall the access

hole plug.

14. Turn the service disconnect to the transfer switch on.

The transfer switch will connect to the utility after a

short time delay.

Set the AUTO/OFF/MANUAL switch to OFF.15.

16. After the engine has stopped running, reinstall the air

intake guard.

17. Reinstall the control panel wiring cover to the air

intake guard.

18. Reinstall the air intake access panel.

19. Set the AUTO/OFF/MANUAL switch to AUTO.

AUTOMATIC OPERATION

SEQUENCE

The generator's control panel houses a logic control circuit

board.This control board constantly monitors utility power

source voltage. Should that voltage drop below a preset

level, control board action will signal the engine to crank

and start.

When utility source voltage is restored above a preset

voltage level, the engine is signaled to shut down.

The actual system operation is not adjustable and is

sequenced by sensors and timers on the control board, as

follows:

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 47 48

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Briggs & Stratton 01931-0 Installation Manual Page 14

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