YOKOI KIKAI KOSAKUSHO HOPE CRU-10, Manual, Page: 13 / 18

12
Inspection
１
) Check the orifice differential pressure between air and gas, and if there is any deviation,
readjust the differential pressure (semiannually or on a timely basis according to the
status of use).
２
) In starting the operation (with the furnace at a cold temperature), set the reference
burner pressure appropriately, and record the combustion air differential pressure under
that pressure. If the differential pressure lowers to 80% or less clean or replace the heat
storage body. If the differential pressure rises to 110% or more, check or replace the
selector valve.
３
) Periodically check the flame condition and the glowing of the front panel, and check the
sight hole for crack, etc. If any defect is found, immediately remedy the defect by
replacing the defective parts or taking other measures.
４
) Check Ultra Vision for contamination, signal, etc. (semiannually or so).
５
) Check the bolts and nuts for looseness.
６
) Check, clean or replace the filter of the combustion blower (weekly or so).
７
) Check and clean the filter, mist separator, auto drain, etc, of the high-pressure air
(semiannually or so).
８
) Lubricate the selector valve with grease (periodically).
Use SUMICO LUBRICANTCO.,LTD.Sumitemp Grease NO.2 or an equivalent
９
) Periodically check the movement and condition of the selector valve. If any defect is
detected, replace the valve.
１０
) When replacing the ceramic balls of the heat storage body, be sure to check the trap. If a
substantial crack or break is found, since the ceramic balls may escape through the trap,
replace or repair the heat storage body.
１１
) If the pilot burner fails to ignite, check the spark plug. If the insulator is cracked or the
insulator end portion is damaged or contaminated with carbon, clean the insulator or
replace the spark plug
１２
) Periodically check the manual valve and control valve of the exhaust line. Since exhaust
gas contains a large quantity of moisture, corrosion due to moisture and resultant
malfunction may be caused.
１３
) Periodically check the ceramic balls for clogging and the number of balls. If the balls are
contaminated, clean them. If the balls are deficient, supply balls to cover the deficits.
Precautions
１
) When the in-furnace temperature is 500
℃
or less, set the excess air ratio to 1.5 or more.
(Otherwise, CO may be generated or accidental fire may be caused.)
２
) Stop the combustion blower after the in-furnace temperature lowers to 500
℃
or less to
protect the nozzle. Also, when the blower is in operation, do not stop the actuator of the
selector valve.
３
) When you have to come close to the burner or its periphery or touch the burner or the
piping for the purpose of checking, etc., since their temperatures are high, be sure to wear
protective gloves, a protective cap, protective glasses, etc.
４
) Design the piping with allowance enough to prevent pressure loss or drift.
５
) Take countermeasures against noise, such as attaching a noise filter or the like, as need
arises.