Miller Electric 280 NT Description Of Engine Controls See Section, Cold Weather Engine Operation

. A complete Parts List is available at www.MillerWelds.com

6-2. Description Of Engine Controls (See Section 6-1)

Engine Control Switch

Use switch to start engine, select speed, and stop engine. Use switch in combination with Engine Speed Control switch to select en- gine speed.

In Run/Idle 3600/2400 RPM position, engine runs at 2400 rpm no weld load and 3600 rpm under weld load.

In Run/Idle 3000/1800 RPM position, engine runs at 1800 rpm no weld load and 3000 rpm under weld load.

In either position, engine speed is deter- mined by weld load and position of Engine Speed Control switch.

.Generator power is available at recep-

tacles RC1 and RC2 only at 1800 rpm. If generator is not locked at 1800 rpm, engine speed increases in response to weld load and generator power output stops at receptacles RC1 and RC2. Generator power load does not affect engine speed.

Engine Choke Control

Use control to change engine air-fuel mix when starting engine.

To Start: pull out choke and turn Engine Control switch to Start position. Release switch and slowly push choke in when engine starts.

With Speed Control switch in Weld, the engine starts at 3000 rpm and remains there for two minutes. Engine speed then reduces to 2000 rpm.

The engine speed reduces from 3000 rpm to 2000 rpm when the Speed Control switch is toggled within the first two minutes of operation and no load is applied.

When an auxiliary power load is applied to 60 Hz receptacle RC1 or RC2, engine speed reduces to 1800 rpm.

.If the engine does not start, let the

engine come to a complete stop before attempting restart.

.During cold weather some gasoline en-

gines encounter difficulties that are easi- ly remedied. See Section 6-3and 8-7.

To Stop: turn Engine Control switch to Off position.

Engine Speed Control Switch

Use switch to control engine auto idle func- tion. Place switch in Generator Lock position when not welding to lock engine speed at 1800 rpm for generator power at 60 Hz ac re- ceptacles RC1 and RC2 (generator power is always available at 60−120 Hz receptacle RC3. See Section 7-2.)

Place switch in Weld position to allow engine speeds to be determined by position of En- gine Control switch. The Speed Control switch is not needed at start−up.

6-3. Cold Weather Engine Operation
		1	Engine Control Switch
		Carburetor Icing
1	Infrequently	Carburetor icing causes the unit to drop below the normal idle speed and then stall.
		This condition occurs when the temperature is near freezing and the relative humid-
	Loaded	ity is high. Ice forms on the throttle plate and inner bore of the carburetor. The engine
		typically restarts without problems but soon stalls again.
		S Treat gasoline with a fuel de−icer product (isopropyl alcohol).
		S Place the Engine Control switch in the Run position.
		S Run engine only when expecting to frequently load it.
		Breather Icing
		Oil breather/pulse line icing occurs in severe cold (continuously below 0_F). Mois-
		ture accumulates in the oil from piston ring blow−by if the engine is extensively idled.
		This may cause vacuum line freezing, oil breather tube freezing or ice in the carbure-
		tor. All of these cause operating problems. Due to ice in the lines, the engine may
		not restart until it is warmed to above freezing.
		S Load engine and reduce idle times to prevent engine shutdowns.
		S Use an electric fuel pump to avoid pulse line freezing.
	Frequently	S Install engine cold−weather kit.
	Loaded	Kohler offers a kit for cold weather operation. Contact engine manufacturer for kit
		information (1-800-544-2444). The user can install these kits. The kit pulls heated
		air from the muffler surface into the carburetor and shuts the cold air off. This in-
		creases engine temperature during operation in both idle and high speed.
		. When the ambient temperatures become warmer (above 45_F) the air flow will
			have to be returned to normal.
			Ref. 216 172

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