TM 3-4230-218-30&P
2-14.
CONTROL PANEL - Continued.
b.
Testing.
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NOTE
The following procedures test all electrical switches for proper operation.
This test procedure requires being familiar with the control panel wiring
schematic on page 2-61.
All wiring designations and item numbers refer to
this schematic.
The use of a multimeter is required throughout this test procedure.
(1) Thermostat Selector Switch (S2).
Thermostat selector switch has two normally closed contacts.
Test switch for proper operation as follows:
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
Remove front panel (page 2-64).
Disconnect switch S4 and S3 leads from terminals 1 and 2
on switch S2.
Set switch S2 to 45°C position.
With temperature at water outlet below 45°, check continui-
t y across terminals (1 and 2). (Previously connected to
switch S4).
If no continuity exists, replace switch S2.
Check continuity on other set of contacts on switch desig-
nated 1 and (2).
If continuity does not exist, replace
switch S2.
Set switch S2 to 120°C position.
Check continuity across terminals 1 and 2 (previously con-
nected to switch S4).
If continuity does not exist, replace
switch S2.
Check continuity across adjacent terminals 1 and 2. If
continuity does not exist, replace switch S2.
For thermostat selector switch replacement refer to page
2-68) .
—
(2) Start Burner Button S1.
START BURNER switch S1 has one normally open switch and
one normally closed switch.
It is a momentary contact switch.
Check this switch for proper operation as follows:
(a) Remove front panel (page 2-64).
2-62
