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DIAGRAM III
Thermostat wires disconnected, or integral thermostat removed. Jumper clip
across
thermostat terminals. White cable plugged into MA lack and attached to thermocouple
post. Selector switch set at 0-300 MA scale.
PROCEDURE No. III
(See Diagram III)
(For testing with a millivoltmeter
Isolated Test of Actuator and Safety Shutoff
only, use Procedure V)
Step A. - BASO Safety Power Unit Test
Before attaching meter cables, set plug valve knob to PILOT position.
Attach proper cables as shown.
With plug valve in PILOT position, turn meter adjustment knob right to highest
reading position, push reset button and light the pilot. (The meter will hold
the BASO power unit open.)
Slowly turn meter adjustment knob to left until BASO power unit drops out,
shutting off the pilot flame. THIS SHOULD OCCUR BETWEEN 45 MA AND
90 MA. A dropout point higher than 90 MA indicates a weak holding unit and
requires replacement.
Step B. - Actuator Test - For Valves with Pilot Line Baso
With plug valve knob in PILOT position, turn meter adjustment knob to right
to highest setting.
Push reset button down and light pilot.
Turn plug valve knob to ON, lighting main burner.
Push down on reset button, holding it down while turning the meter adjustment
knob slowly to the left to the point where the main burner goes off, and to the
right to the point where the main burner comes on. THE CLOSING POINT
SHOULD BE AT 35 MA OR BELOW. THE OPENING POINT SHOULD BE AT
ANY POINT UP TO 110 MA. Repeat two or more times and take an average
reading. A higher opening or closing point indicates replacement.
Actuator Test - For Valves with Main Line Baso
Turn meter adjusting knob to the left as far as possible. Attach thermocouple
to Baso.
With plug valve knob in pilot position, push reset button down and light pilot.
Turn plug valve knob to on.
Turn meter adjusting knob slowly to the right until main burner comes on. The
point at which this occurs would be any point up to 110 MA. Turn meter
adjusting knob slowly to left until main burner goes off.
(If adjustment does
not reduce low enough, remove plug from Test Kit jack to accomplish closing.)
Any closing point below 35 MA is satisfactory.
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