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MODEL C24EA - SUPER HEATER
F25213 (May 2006)Page 21 of 52
DIAGNOSTIC CHECKS
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS
WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT / TAGOUT
PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.
1. Check voltage across super heater wires at limiting and regulating contactor terminals.
A. If voltage is correct, check current draw (step 2).
B. If voltage is not correct, check the following:
1) Voltage supply to steamer.
2) Fuses or breaker open.
3) Relay K4.
4) Power to contactor coils.
5) Contactors not pulling in. (Mechanical)
2. Check current draw (amps) through super heater lead wires using an amp clamp meter.
A. If current is correct, then super heater is ok.
B. If current is not correct, check resistance (step 3).
3. Remove one of the super heater lead wires from the regulating contactor and check resistance using a VOM.
A. If resistance is not correct, replace super heater.
VOLTAGE TOTAL kW CURRENT RESISTANCE (OHMS)
208/240 0.75 3.1 76.8
480Y/277
1
0.75 2.7 102.3
1
Elements of 480V machines are connected in Wye configuration for 277V across super heater.
NOTE: Values in table are nominal. Tolerance is ±10 %.
4. Check steamer for proper operation.