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BASO POWER UNIT
0 C
0
BA S 01 RON
ACTUATOR
- B300
THE RhIOCOUPLE
TEST KU
THERMOSTAT
DIAGRAM V
BLftCK
Thermocouple connected,
Thermostat wires connected. Clip cable plugged into MV lack. Black clip to Terminal 1.
Red clip to cover screw (ground). Selector switch set at 300 MV scale.
PROCEDURE No. V (See Diagram V)
Closed Circuit MV Test of Actuator
Step A. - MV Opening Point - For Valves with Pilot Line Baso
Turn plug valve to OFF position and allow thermocouple to cool.
Turn thermostat to highest setting.
Attach millivoltmeter cables as shown.
Turn plug valve to ON position, hold down reset of BASO, light pilot burner.
Continue to hold down reset and watch the millivoltmeter needle. THE POINT
AT WHICH THE VALVE OPENS AND THE MAIN BURNER IGNITES SHOULD
BE BETWEEN 50 MV AND 65 MV. If actuator pulls in above 65 MV, it should
be replaced.
Step B. - MV Closing Point
1.
If the installation includes a pilot cock, use the following procedure.
With the thermostat contacts closed, and the main burner on, extinguish
the pilot flame by turning off the pilot cock.
As the thermocouple is cooling, watch for the millivolt reading at the point
where the main burner shuts
off. THIS SHOULD OCCUR SOMEWHERE
BETWEEN 20 MV AND 15 MV.
2.
If the installation does not include a pilot cock, use the following procedure.
With the thermostat contacts closed and the main burner on, push in and
turn plug valve knob to OFF to extinguish pilot and main burner flame.
As the thermocouple
is
cooling, watch the millivoltmeter needle for the
indication of the point of closing of the actuator. (This can occur at the
same time or after the BASO safety shutoff audibly drops out. The closing
action of the actuator
is
barely audible.
It can be noted by a sudden
slight deflection of the millivoitmeter needle at the actual time of closing.)
THIS SHOULD OCCUR SOMEWHERE BETWEEN 20 MV AND 15 MV. If the
reading at this point is greater than 20 millivolts, the following could be
at fault:
High resistance in the actuator. Replace entire unit.
Loose or high resistant thermocouple. (Test under Procedures
I and II)
High resistant thermostat or loose thermostat circuit connections.
(Test
under Procedure IV)
.4
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