Hiện đại hóa VỚI CÁC R4140 R4140 lửa Conffols trình lý tưởng cho thay thế cũ pt0g'8JlY'ners Thái Lan không còn meetlhe f8CJ, llremenis 01 ~ cơ quan roval. Họ incor porate tất cả các thay đổi lfming rllqJlred: PI OCIet: 1 Ler, '974, sửa đổi Underwrltel 'phòng thí nghiệm. Tiêu chuẩn 5afety-UL 296 oN ghi DVD | R4136C D INDUSTRIAL FLAME SAFEGUARD CONTROLS FIG. 65 These controls directly replace older R4138A and B models to meet the latest requirements. They are especially suitable where long periods of burner operation without shutdown are normal such as in heat-treating ovens and kilns. The R4138D is the same as the R4138C with the addition of a power failure override circuit to prevent shutdown during very short power outages power line switching second or less . The R4138C is available in 120 220 and 240 volt models the R4138D Is available only in a 120 voU model. SAFETY FEATURES The A4138C and D provide a Safe start Check for a flame or a condition simulating a flame at startup. If the 2K is pulled in before the START button Is pressed 2K2 is open preventing the load relay IK from pulling in. The system cannot be started until the condition Is corrected and 2K drops out. They also provide safety shutdown on -failure to ignite the pilot. Lockout will occur If the START button is held in longer than the lockout switch timing. - loss at flame during the run period. -failure in the flame detection system If e selfchecking system if used-see Table 11. Lockout will occur if the START button is held in longer than the lockout switch timing. On safety shutdown the pilot and main fuel valve s are de-energized. If used the external alarm is energized. The START button must be manually pressed to restart the system fl the lockout switch trips the load relay 1K drops out and the lockout switch must be manually reset to restart the system. OTHER FEATURES A plug-in S427D Purge Timer Is available as an accessory to provide e timed purge period prior to the manual startup. An options I remote reset assembly allows resetting the lockout switch from a remote location. Incandescent indicator lamps FLAME OFF PURGE COMPLETE FLAME ON provide a visual check of the system condition. The R4138C or D plugs into a subbase or cabinet equipped with quick-connect contacts. All .
