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25-30-31
Oct. 24, 2011
CMM & IPL
1010099 SERIES
Page 1001
TESTING AND TROUBLE SHOOTING
1 GENERAL
This chapter outlines procedures based on test point/location methods for bench/shop testing and
trouble shooting of the rapid water heater.
2 OPERATIONAL TESTS (Ref. Fig. 102)
A. Heating elements circuit (Ref. Items 1 through 17)
(1) Circuit
function
(a) Heating elements (11,12,13) are activated/deactivated by the power switch (4) via
the relay (2).
(b) The relay is controlled by a thermostat (6) to control the operation of the heating
elements (11,12,13).
(2) Check
procedure
(a) Connect water heater to bench power supply (Ref. Fig. 101).
(b) Set power switch (4) to ON position.
(c) Observe current consumption of phases A, B and C on test bench ammeter. Phase
currents must be 14.5 ± 0.2A. If the phase currents are different, relevant heating
element A, B or C is defective. Replace heating element.
(d) Power lamp white (10) and lamp amber (8) illuminated, no readout on ammeters.
Heating elements (11,12,13) are defective and have to be replaced or relay (2) is
defective and has to be replaced.
(e) Lamp white (10) illuminated, lamp amber (8) extinguished, no readout on the
ammeters. Overheat protector is activated or relay or the thermostat is defective.
Reset overheat protector (5) or replace relay (2) or thermostat (6).
B. Lamps (Ref. Items 8,10)
(1) Circuit
function
(a) Lamps (8,10) illuminate when power switch (4) is set to ON position.
(2) Check
procedure
(a) Use power switch (4) to switch on a cold rapid water heater.
(b) If lamp amber (8) or lamp white (10) does not illuminate, bulb (9) is defective.
Replace relevant bulb.