îłîîîîîî
S18
Combustion Air
Prove Switch
Gas Valve
Gas
Manifold
Vent Connector
B6
Combustion
Air Inducer
Combustion Air
Prove Switch Tubing
FIGURE 11
6-Combustion Air Inducer B6
Combustion air inducers provide air to the corresponding
burners while clearing the combustion chamber of ex-
haust gases. The inducer begins operating immediately
upon receiving a thermostat demand and is de-energized
îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîżîîî
îˇîîî îîîîîîîî îîîîî îî îîîîîîîîšî îîîîîîîîîîîîî îłîśîŚî îîîîîî
îîîîîî îîîîîîîîî îî îîîîîîîî
îîîîîî îîîîîîîî¤îîîîîîîîîî îîîîîîîî
îîî îîîîîľîłî°î îîîî îîîî îîîîîîîîî îîîîî îîîîîîîîîîî îîîîîîîîî
protection. Inducers are supplied by various manufactur-
îîîîîîľîîîîîîîîîîîîîîîîî
îîîîîîîîîîîîîîîîîśîîîîîżîîîîîîîîîî
electrical ratings can be found on the unit rating plate.
î˛îî îî îîîîîîîî îîîîîîî îîşîîîî îîîî îîîîîîîîî îîîîîîîî î¤îî îîî-
îîîîîîî îîîî îîîîîîîî îîîîîîîî¤îî îîîîî îîîîîîî îîî îîîîîîîî îîîî
the combustion air inducer to vent exhaust gases from
îîîîî
îîîîîîîîîşîîîîîîîîîîîî
îîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîîîîîîîîîîîîîîîîîîîîîî-
îîîî îîîîîîîî îîîîî îîîî îîîî
îîîîîîî îîîî îîîîîîîî îîî îîîîîîîîîî
î
îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîşîîîî
the combustion air prove switch is closed and the delay is
îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîżîîîîîîîîîîîîîîîîîîî
îîîîîîîîîîîîîîîîîîîîîîîżîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî-
îîîî îîîîîîîîîîî îśîîîîîîîî îîîîîî îîîîîîîîîîîî îîîîîî îîîîî îîî
sensed or at the end of the eight second trial for ignition.
î˛îî îîîîîîîîîî îîîîîîîî îîîî îîîîîîî îîîî îîîîîîîî îîîîîî îî-
îîîîîî îîî îîîî îîîîîîîîîîîîî¤î îşîî îîîîîîîîîîî îîîîîîî îîîîî
start the inducer in high speed for second-stage heat
îîîîîîîşîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîîîîîżîîîîîîîîîîîîîîî
All combustion air inducer motors are sealed and cannot
be oiled. The inducer cannot be adjusted but can be re-
moved from the vestibule to clean the wheel.
7-Combustion Air Motor Capacitor C3
The combustion air inducer motors in all ZGB units require
run capacitors. Capacitor C3 is connected to combustion
îîîîîîîîîîîîîĽîîîîľîîîîîîîîîîîîî
îîîîîîîîîîîîîîîîîîîîîîîîîîîîî-
bustion air motor nameplate.
8-Gas Valves GV1
Units are equipped with a single or two stage gas valve.
î˛îîîîîîîîîîîîîîżîîîîîîîîîîîîîîîîîîîîîżîîîîîîîîîîîîîîîîîîîîîî-
gized by the ignition control simultaneously with the spark
îîîîîîîîîîîî˛îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîżîîîîîîîîî
second stage operator is energized directly from A3. A
îîîîîîîîîîîîîó°¨îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
îó°¨îîî°îîîîîîîîîîîîó°¨îîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîîîîî
îîîîîîîîîîîîîîîî˛îîî
îîîîîîîîîîîîżîîîîîîîîîîîîîîîîżîîîîîîîîîîîîî
îîîîîîîîîîîîîîîîîó°¨îîîîîîîîîîîîîîîîîîîîîîîîî
îˇîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîî
îîîîîîîîîżîîîîîîîîîîîîîżîîîî
îŠîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîˇîî
îîîîî
shows factory gas valve regulation pressures.
TABLE 7
î˛îîîîîîîîîî°îîîîîîîîîłîîîîîîîîîłîîîî
Natural îŻîłîîłîîîîîî
îŻîî High îŻîî High
1.7 îîîîîî´ 3.5 îîîîîî´î îîîî´îîîîîîî´î îîîîî´ îîîîîî´
9-Spark Electrode (Ignitor) Figure 12
An electrode assembly is used for ignition spark. The elec-
trode is mounted through holes under the burner located
farthest to the right. The electrode tip protrudes into the
îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîîˇîîîîîîîîîîîîîîî-
sembly is fastened to burner supports and can be removed
for service without removing any part of the burners.
î§îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîżîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîîŠîîîîîîîîîîîîîîîîîî
burner to burner until all are lit.
The spark electrode is connected to the ignition control by
îîîˇîîîîîîîîîîîîîîîîîîîîîîîîîîˇîîîîîîîîîîîîîîîîî´îîîîîîîîîîî
female quick connects on both ends of the wire.
NOTE - If electrode wire must be replaced, wire and sup-
pression must be same type cable. See www.davenet for
replacement.
The spark electrode assembly can be removed for inspec-
tion by removing the screw securing the electrode assem-
bly and sliding it out of unit.
îŠîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîîîîîîî
and gapped correctly. Spark gap may be checked with
appropriately sized twist drills or feeler gauges. Discon-
nect power to the unit and remove electrode assembly.
îˇîîîîîîîîîîîîîîî
îîî
îîîîîîîîîîîîî´îîîîîîîîî´îîîîîîîîîîîîîî
îîîîîîśîîîîżîîîîîîîî
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