Echo PB-580 Operator's Manual page 22

Operation
Cold weather operation
1. Plug
1. Warm weather position
3. Plug
1. Back cushion
1. Intake cover
2. Cold weather position
Plug
1. Remove air filter cover.
2. For operation in cold weather, install plug in cold weather po-
sition, otherwise icing can occur.
3. For operation in normal weather, install plug in warm weath-
er position, otherwise over heating can occur.
4. Install air filter cover.
Intake cover (optional)
Install intake cover when you feel cold on your back.
1. Remove back cushion from frame.
2. Install intake cover on frame over air intake.
3. Install back cushion to frame over intake cover.
NOTE
Blower performance may be reduced slightly.
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