Assessments - 2, GPA: 4.5
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Facilidade de uso
It may be used with either a 2-wire or a 3-wire Series 10 thermostat. This 668 control is equipped with a red Safety Reset Indi- -INSTALLATION-------- cator Light which glows whenever the control locks out on safety to stop the burner. The 668 is for use with the 956 Flame Detector. 'Formerly called constant ignition. SPECIFICATIONS The proper Location and Mounting of the primary oil burner control panel on the burner and the flame detector with respect to the oil flame shall be determined by the furnace, boiler, or burner manufacturer. Room Thermostat: Set dial of adjustable heater at ,4A. If Time Delay Fan Switch is used, set dial at .5A (for typical Fan Switch current of .15A.) Time Delay Fan Switch {.15A Max. at 25v): If used, connect to F-|-B terminals. Safety Timing: 45 seconds. WIRING-------------------------—------ If this control, supplied as part of a furnace, boiler or burner, is wired to the equipment or if the manufacturer of such equipment provides instructions for wiring this control, then follow his recommendations. If n& special wiring instructions are given, then follow the electrical connections shown. USING 668-430 TO REPLACE LOW VOLTAGE PRIMARY CONTROLS (SUCH AS TYPES 668-1 TO -99) For more complicated systems, especially for hot water heating, consult the manufacturer of the heating plant or write to White-Rodgers giving full details of the desired sequence of control operation. USING 668-430 TO REPLACE LINE VOLTAGE PRIMARY CONTROLS (SUCH AS TYPES 6L68-1 TO -99) TESTING The following control checks should be made after each installation to insure that the controls are correctly wired and functioning properly. 1. Open the main line switch. 2. Adjust thermostat or operating control to call for heat. 3. Operate the manual reset button on top of control. 4. Make certain that high limit control is set at the correct temperature. 5. Open the hand valve in the oil line. The system is now ready for the following tests. A. NORMAL CYCLE: Close the line switch. The burner should start and continue to run normally. (If burner starts, establishing flame, but then locks out on safety, make “Flame Detector Check” at this time. (TESTING CONTINUED ON NEXT PAGE) E. ISMISR5DN < WHITE-RODGERS DIVISION EMERSON ELECTRIC CO. 9797 REAVIS ROAD ST. LOUIS. MISSOURI 63123 Printed in U.S.A. PART No. 37-2649-A Replaces 37-2649 B. SAFETY TIMING: D. FLAME DETECTOR CHECK (Continued): 1. Let the burner run for about 5 minutes. Then remove one of Flame Detector leads from the “F” terminals. After a time period corresponding to the safety timing has elapsed, the control should lock out on safety, stopping the burner and causing the red Safety Reset Indicator Light to glow. 2. Open the line switch. 3. Replace Flame Detector lead removed in step 1. 4. Wait about 3 minutes. Then operate the manual reset button on top of control. C. HIGH LIMIT AND THERMOSTAT CHECK: 1. Close the line switch to start the burner. 2. Lower the setting of the high limit control to its lowest setting. This should stop the burner, unless furnace or boiler temperature is below the minimum setting of the high limit. 3. Return high limit control to its proper setting. Burner should restart. 4. With the burner running, turn thermostat to its lowest setting. This should stop the burner, unless actual room temperature is below the lowest setting of the thermostat. (Note: On systems supplying domestic hot water, burner will continue to run if low limit control is not satisfied.) 5. Return thermostat to its proper setting. D. FLAME DETECTOR CHECK: (This test is not required if the control performs as described in test A.) If the burner starts but the control locks out (stopping the burner), check the flame detector as follows: 1. Open the line switch. 2. Connect one end of a wire jumper to, one of the “F” terminals. 3. Start the burner by closing the line switch. As soon as flame has been established, connect other end of the wire jumper to the other “F” terminal. WARNING: The control provides no safety protection with this jumper installed. Do NOT leave burner in this condition except for making this check. If the control still locks out with the jumper installed, the control should be replaced. If the control does not lock out, however, check the operation of the 956 flame detector as follows: 4. If safety lockout problem is of an occasional nature, the following additional check may be made to insure that flame detector location is not a marginal one: (a) Disconnect flame detector leads from “F” terminals. Possible Cause of Trouble Correction Open circuit in Cell Replace Cell (or Cell Assembly) of 956 Flame Detector. Do not disturb position of bracket or socket assembly. Flame detector improperly positioned. Locate flame detector according to the burner manufacturer's specifications. TYPE 956 FLAME DETECTORS OLD STYLE NEW STYLE Da SOCKET ASSEMBLY Ml CELL ASSEMBLY Ml Rotate Cell Assembly co...