Garland Air-Deck G56PT, Инструкция по установке и эксплуатации

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Part # 1382670 (12/07) Page 14
INTERMITTENT PILOT INSTRUCTIONS Continued
Note: If the ground circuit path is incomplete the S86C, D, G
and H system control will allow one trial-for-ignition before
going into safety lockout .
Electrical grounding connections at the pilot burner,
ignitor/sensor and S86 must be clean and tight . If lead wire
is damaged or deteriorated, use only No . 14 of 18 gauge,
moisture-resistant, thermoplastic insulated wire with
105C . (221 F) minimum rating as replacement . Excessive
temperature at the ceramic flame rod insulator can also
permit electrical leakage to ground . Examine the flame rod
and mounting bracket, and correct if bent out of position .
Replace Q345, Q346 Q348 or ignitor/sensor if insulator is
cracked .
Check Spark Ignition Circuit
The electronic module and step-up transformer in the S86
provides spark ignition at 15,000 Volts (open circuit) . This
circuit can be checked at the S86 module as follows:
1 . Turn off the manual gas cock to prevent the flow of gas .
2 . Disconnect the ignition cable at the S86 stud terminal to
isolate the circuit from the pilot burner/ignitor/sensor,
and prepare a short jumper lead using heavily insulated
wire, such as ignition cable .
3 . Energize the S86, touch one end of the jumper firmly to
the S86 ground terminal (GND) . Do not disconnect the
existing ground lead . Move the free end slowly toward
the stud terminal to establish a spark and then pull the
lead wire slowly away from the stud . Note the length of
the gap at which arcing stops .
CAUTION: Do not touch either stripped end of jumper or
stud terminal . This is a very high voltage circuit and electrical
shock can result . Perform the test immediately upon
energizing the system – before the S86C,D,G goes into safety
lockout and interrupts the spark circuit .
4 . An arc length of 1/8” (3 .2 mm) or more indicates
satisfactory voltage output . Replace the S86 if not arc can
be established or the maximum gap is less then 1/8” (3 .2
mm), and the fuse and power to the S86 input terminal
was okay .
Control Module Flame Sensor Circuit
The control module provides AC power to the ignitor/sensor
which the pilot burner flame rectifies to direct current . If the
flame signal back to the control module is not at least 1 .5 µA
DC, the system will lockout . The output of the flame sensing
circuit cannot be checked directly, so check the flame
sensing circuit indirectly by checking the flame sensing
current from the ignitor/sensor to the control module as
follows .
1 . Connect a meter (DC micrometer scale) in series with
the flame signal ground wire as shown below . Use the
Honeywell W136A Test Meter, or equivalent . Disconnect
the ground wire at the control module .
Connect the red (positive) lead of the meter to the free
end of the ground wire . Connect the black (negative)
meter lead to the quick-connect ground terminal on the
control module .
2 . Restart the system and read the meter . The flame sensor
current must be at least 1 .5µA, and the reading must be
steady . If the reading is below the value designated or the
reading is unsteady, check the pilot flame and electrical
connections as described above . Also, replace the ignitor/
sensor if the ceramic insulator is cracked .