| 摘要 |
<p>PURPOSE:To prevent a malfunction of storing arroneously regulated value data from being stored by operator's misoperation in a semiconductor nonvolatile memory by an operator. CONSTITUTION:A mode controller 55 transfers, when a test switch 550 is pressed during a normal operation mode, an operating mode of a warm-air heater to a test mode, and transfers, when a gas switch 551, a proportional valve switch 552, or fan Lo-Hi switches 553, 554 are pressed during the test mode, to Lo side. Hi side flame failure decision level regulation and write mode, a proportional valve current regulating and write mode and a Lo side-Hi side fan current regulating and write mode.</p> |
