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Lennox ZGB Series User Manual

Lennox ZGB Series
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Page 33
D-GAS HEAT COMPONENTS
๎˜“๎˜–๎˜™๎˜๎˜ƒ๎˜“๎˜—๎˜›๎˜๎˜ƒ๎˜“๎˜™๎˜“๎˜๎˜ƒ๎˜“๎˜š๎˜—๎˜ƒ๎˜ถ๎™—๎™‡๎˜ƒ๎™Š๎™„๎™–๎˜ƒ๎™‹๎™ˆ๎™„๎™—๎˜ž๎˜ƒ๎˜”๎˜๎™–๎™—๎™„๎™Š๎™ˆ๎˜ƒ๎˜™๎˜˜๎˜ฎ๎™…๎™—๎™˜๎™‹๎˜ƒ๎™Œ๎™‘๎™“๎™˜๎™—
๎˜“๎˜–๎˜™๎˜๎˜ƒ๎˜“๎˜—๎˜›๎˜๎˜ƒ๎˜“๎˜™๎˜“๎˜๎˜ƒ๎˜“๎˜š๎˜—๎˜ƒ๎˜ฐ๎™ˆ๎™‡๎˜ƒ๎™Š๎™„๎™–๎˜ƒ๎™‹๎™ˆ๎™„๎™—๎˜ž๎˜ƒ๎˜”๎˜๎™–๎™—๎™„๎™Š๎™ˆ๎˜ƒ๎˜”๎˜“๎˜›๎˜ฎ๎™…๎™—๎™˜๎™‹๎˜ƒ๎™Œ๎™‘๎™“๎™˜๎™—
๎˜“๎˜–๎˜™๎˜๎˜ƒ๎˜“๎˜—๎˜›๎˜๎˜ƒ๎˜“๎˜™๎˜“๎˜๎˜ƒ๎˜“๎˜š๎˜—๎˜ƒ๎˜ฐ๎™ˆ๎™‡๎˜ƒ๎™Š๎™„๎™–๎˜ƒ๎™‹๎™ˆ๎™„๎™—๎˜ž๎˜ƒ๎˜•๎˜๎™–๎™—๎™„๎™Š๎™ˆ๎˜ƒ๎˜›๎˜”๎˜’๎˜”๎˜“๎˜›๎˜ฎ๎™…๎™—๎™˜๎˜ƒ๎™Œ๎™‘๎™“๎™˜๎™—
๎˜“๎˜—๎˜›๎˜๎˜ƒ๎˜“๎˜™๎˜“๎˜๎˜ƒ๎˜“๎˜š๎˜—๎˜ƒ๎˜ซ๎™Œ๎™Š๎™‹๎˜ƒ๎™Š๎™„๎™–๎˜ƒ๎™‹๎™ˆ๎™„๎™—๎˜ž๎˜ƒ๎˜”๎˜๎™–๎™—๎™„๎™Š๎™ˆ๎˜ƒ๎˜”๎˜˜๎˜“๎˜ฎ๎™…๎™—๎™˜๎˜ƒ๎™Œ๎™‘๎™“๎™˜๎™—
๎˜“๎˜—๎˜›๎˜๎˜ƒ๎˜“๎˜™๎˜“๎˜๎˜ƒ๎˜“๎˜š๎˜—๎˜ƒ๎˜ซ๎™Œ๎™Š๎™‹๎˜ƒ๎™Š๎™„๎™–๎˜ƒ๎™‹๎™ˆ๎™„๎™—๎˜ž๎˜ƒ๎˜•๎˜๎™–๎™—๎™„๎™Š๎™ˆ๎˜ƒ๎˜”๎˜”๎˜–๎˜’๎˜”๎˜˜๎˜“๎˜ฎ๎™…๎™—๎™˜๎˜ƒ๎™Œ๎™‘๎™“๎™˜๎™—
๎˜ถ๎™ˆ๎™ˆ๎˜ƒ๎˜ช๎™„๎™–๎˜ƒ๎˜ซ๎™ˆ๎™„๎™—๎˜ƒ๎˜ถ๎™“๎™ˆ๎™†๎™Œ๎šฟ๎™†๎™„๎™—๎™Œ๎™’๎™‘๎™–๎˜ƒ๎™’๎™‘๎˜ƒ๎˜ณ๎™„๎™Š๎™ˆ๎˜ƒ๎˜š๎˜ƒ๎™‰๎™’๎™•๎˜ƒ๎™๎™’๎™•๎™ˆ๎˜ƒ๎™‡๎™ˆ๎™—๎™„๎™Œ๎™๎˜‘
1-Heat Exchanger Figure 10
The ZGB units use aluminized steel inshot burners with
tubular aluminized steel heat exchangers and redundant
gas valve. Burners in all units use a burner venturi to mix
gas and air for proper combustion. Combustion takes
place at each tube entrance. As hot combustion gases are
drawn upward through each tube by the combustion air in-
๎™‡๎™˜๎™†๎™ˆ๎™•๎˜๎˜ƒ๎™ˆ๎™›๎™‹๎™„๎™˜๎™–๎™—๎˜ƒ๎™Š๎™„๎™–๎™ˆ๎™–๎˜ƒ๎™„๎™•๎™ˆ๎˜ƒ๎™‡๎™•๎™„๎™š๎™‘๎˜ƒ๎™’๎™˜๎™—๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎™—๎™’๎™“๎˜ƒ๎™„๎™‘๎™‡๎˜ƒ๎™‰๎™•๎™ˆ๎™–๎™‹๎˜ƒ๎™„๎™Œ๎™•๎˜’
gas mixture is drawn in at the bottom. Heat is transferred
to the air stream from all surfaces of the heat exchanger
tubes. The supply air blower forces air across the tubes
to extract the heat of combustion. The shape of the tubes
ensures maximum heat exchange.
The gas valves on two stage units accomplish staging by
allowing more or less gas to the burners as called for by
๎™‹๎™ˆ๎™„๎™—๎™Œ๎™‘๎™Š๎˜ƒ๎™‡๎™ˆ๎™๎™„๎™‘๎™‡๎˜‘๎˜ƒ๎˜ฏ๎™’๎™š๎˜ƒ๎˜ฑ๎˜ฒ๎™›๎˜ƒ๎™๎™’๎™‡๎™ˆ๎™๎™–๎˜ƒ๎™„๎™•๎™ˆ๎˜ƒ๎™„๎™™๎™„๎™Œ๎™๎™„๎™…๎™๎™ˆ๎˜ƒ๎™—๎™‹๎™„๎™—๎˜ƒ๎™๎™ˆ๎™ˆ๎™—๎˜ƒ
the California Air Quality Management NOx requirement
๎™’๎™‰๎˜ƒ๎˜—๎˜“๎˜ƒ๎™‘๎™„๎™‘๎™’๎™Š๎™•๎™„๎™๎˜’๎˜ƒ๎™๎™’๎™˜๎™๎™ˆ๎˜‘๎˜ƒ๎˜ถ๎™—๎™„๎™Œ๎™‘๎™๎™ˆ๎™–๎™–๎˜ƒ๎™–๎™—๎™ˆ๎™ˆ๎™๎˜ƒ๎™…๎™˜๎™•๎™‘๎™ˆ๎™•๎˜ƒ๎™Œ๎™‘๎™–๎™ˆ๎™•๎™—๎™–๎˜ƒ๎™„๎™•๎™ˆ๎˜ƒ
๎™˜๎™–๎™ˆ๎™‡๎˜ƒ๎™—๎™’๎˜ƒ๎™†๎™’๎™‘๎™—๎™•๎™’๎™๎˜ƒ๎›€๎™„๎™๎™ˆ๎˜ƒ๎™—๎™ˆ๎™๎™“๎™ˆ๎™•๎™„๎™—๎™˜๎™•๎™ˆ๎™–๎˜ƒ๎™—๎™’๎˜ƒ๎™๎™ˆ๎™ˆ๎™—๎˜ƒ๎™—๎™‹๎™Œ๎™–๎˜ƒ๎™ˆ๎™๎™Œ๎™–๎™–๎™Œ๎™’๎™‘๎˜ƒ
level.
2-Burner Box Assembly Figure 11
๎˜ท๎™‹๎™ˆ๎˜ƒ๎™…๎™˜๎™•๎™‘๎™ˆ๎™•๎˜ƒ๎™„๎™–๎™–๎™ˆ๎™๎™…๎™๎™œ๎˜ƒ๎™†๎™’๎™‘๎™–๎™Œ๎™–๎™—๎™–๎˜ƒ๎™’๎™‰๎˜ƒ๎™„๎˜ƒ๎™–๎™“๎™„๎™•๎™Ž๎˜ƒ๎™ˆ๎™๎™ˆ๎™†๎™—๎™•๎™’๎™‡๎™ˆ๎˜๎˜ƒ๎›€๎™„๎™๎™ˆ๎˜ƒ
sensing electrode and gas valve. Ignition board A3 con-
trols all functions of the assembly.
Burners
All units use inshot burners. Burners are factory-set and
do not require adjustment. A peep hole with cover is fur-
๎™‘๎™Œ๎™–๎™‹๎™ˆ๎™‡๎˜ƒ ๎™Œ๎™‘๎˜ƒ ๎™—๎™‹๎™ˆ๎˜ƒ ๎™‹๎™ˆ๎™„๎™—๎™Œ๎™‘๎™Š๎˜ƒ ๎™„๎™†๎™†๎™ˆ๎™–๎™–๎˜ƒ ๎™“๎™„๎™‘๎™ˆ๎™๎˜ƒ ๎™‰๎™’๎™•๎˜ƒ ๎›€๎™„๎™๎™ˆ๎˜ƒ ๎™™๎™Œ๎™ˆ๎™š๎™Œ๎™‘๎™Š๎˜‘๎˜ƒ
Always operate the unit with the access panel in place.
Burners can be removed as a one piece assembly for ser-
vice. Do not try to separate.
๎˜ฒ๎™•๎™Œ๎šฟ๎™†๎™ˆ
๎˜จ๎™„๎™†๎™‹๎˜ƒ๎™…๎™˜๎™•๎™‘๎™ˆ๎™•๎˜ƒ๎™˜๎™–๎™ˆ๎™–๎˜ƒ๎™„๎™‘๎˜ƒ๎™’๎™•๎™Œ๎šฟ๎™†๎™ˆ๎˜ƒ๎™š๎™‹๎™Œ๎™†๎™‹๎˜ƒ๎™Œ๎™–๎˜ƒ๎™๎™„๎™—๎™†๎™‹๎™ˆ๎™‡๎˜ƒ๎™—๎™’๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎™…๎™˜๎™•๎™‘-
๎™ˆ๎™•๎˜ƒ๎™Œ๎™‘๎™“๎™˜๎™—๎˜‘๎˜ƒ๎˜ท๎™‹๎™ˆ๎˜ƒ๎™’๎™•๎™Œ๎šฟ๎™†๎™ˆ๎˜ƒ๎™Œ๎™–๎˜ƒ๎™—๎™‹๎™•๎™ˆ๎™„๎™‡๎™ˆ๎™‡๎˜ƒ๎™Œ๎™‘๎™—๎™’๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎™…๎™˜๎™•๎™‘๎™ˆ๎™•๎˜ƒ๎™๎™„๎™‘๎™Œ๎™‰๎™’๎™๎™‡๎˜‘๎˜ƒ
๎˜ท๎™‹๎™ˆ๎˜ƒ๎™…๎™˜๎™•๎™‘๎™ˆ๎™•๎˜ƒ๎™Œ๎™–๎˜ƒ๎™–๎™˜๎™“๎™“๎™’๎™•๎™—๎™ˆ๎™‡๎˜ƒ๎™…๎™œ๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎™’๎™•๎™Œ๎šฟ๎™†๎™ˆ๎˜ƒ๎™„๎™‘๎™‡๎˜ƒ๎™š๎™Œ๎™๎™๎˜ƒ๎™ˆ๎™„๎™–๎™Œ๎™๎™œ๎˜ƒ๎™–๎™๎™Œ๎™‡๎™ˆ๎˜ƒ
๎™’๓ฐ€จ๎˜ƒ ๎™‰๎™’๎™•๎˜ƒ ๎™–๎™ˆ๎™•๎™™๎™Œ๎™†๎™ˆ๎˜ƒ ๎™’๎™‘๎™†๎™ˆ๎˜ƒ ๎™—๎™‹๎™ˆ๎˜ƒ ๎™๎™’๎™˜๎™‘๎™—๎™Œ๎™‘๎™Š๎˜ƒ ๎™–๎™†๎™•๎™ˆ๎™š๎™–๎˜ƒ ๎™„๎™•๎™ˆ๎˜ƒ ๎™•๎™ˆ๎™๎™’๎™™๎™ˆ๎™‡๎˜ƒ
from the burners.
NOTE-Do not use thread sealing compound on the ori๎šฟc-
es. Using thread sealing compound may plug the ori๎šฟces.
๎˜จ๎™„๎™†๎™‹๎˜ƒ๎™’๎™•๎™Œ๎šฟ๎™†๎™ˆ๎˜ƒ๎™„๎™‘๎™‡๎˜ƒ๎™…๎™˜๎™•๎™‘๎™ˆ๎™•๎˜ƒ๎™„๎™•๎™ˆ๎˜ƒ๎™–๎™Œ๎™๎™ˆ๎™‡๎˜ƒ๎™–๎™“๎™ˆ๎™†๎™Œ๎šฟ๎™†๎™„๎™๎™๎™œ๎˜ƒ๎™—๎™’๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎™˜๎™‘๎™Œ๎™—๎˜‘๎˜ƒ
๎˜ต๎™ˆ๎™‰๎™ˆ๎™•๎˜ƒ ๎™—๎™’๎˜ƒ ๎˜ณ๎™•๎™’๎™‡๎™˜๎™†๎™—๎˜ƒ ๎˜ฝ๎™’๎™‘๎™ˆ๎˜ƒ ๎™„๎™—๎˜ƒ ๎™š๎™š๎™š๎˜‘๎™‡๎™„๎™™๎™ˆ๎™‘๎™ˆ๎™—๎˜‘๎™†๎™’๎™๎˜ƒ ๎™‰๎™’๎™•๎˜ƒ ๎™†๎™’๎™•๎™•๎™ˆ๎™†๎™—๎˜ƒ
sizing information.
3-Primary High Temperature Limit S10
๎˜ถ๎˜”๎˜“๎˜ƒ๎™Œ๎™–๎˜ƒ๎™„๎˜ƒ๎˜ถ๎˜ณ๎˜ถ๎˜ท๎˜ƒ๎˜ฑ๎˜‘๎˜ฆ๎˜‘๎˜ƒ๎™‹๎™Œ๎™Š๎™‹๎˜ƒ๎™—๎™ˆ๎™๎™“๎™ˆ๎™•๎™„๎™—๎™˜๎™•๎™ˆ๎˜ƒ๎™“๎™•๎™Œ๎™๎™„๎™•๎™œ๎˜ƒ๎™๎™Œ๎™๎™Œ๎™—๎˜ƒ๎™‰๎™’๎™•๎˜ƒ๎™Š๎™„๎™–๎˜ƒ
๎™‹๎™ˆ๎™„๎™—๎˜ƒ ๎™Œ๎™‘๎˜ƒ ๎™„๎™๎™๎˜ƒ ๎™˜๎™‘๎™Œ๎™—๎™–๎˜‘๎˜ƒ ๎˜ถ๎˜”๎˜“๎˜ƒ ๎™Œ๎™–๎˜ƒ ๎™๎™’๎™†๎™„๎™—๎™ˆ๎™‡๎˜ƒ ๎™’๎™‘๎˜ƒ ๎™—๎™‹๎™ˆ๎˜ƒ ๎™™๎™ˆ๎™–๎™—๎™Œ๎™…๎™˜๎™๎™ˆ๎˜ƒ ๎™“๎™„๎™‘๎™ˆ๎™๎˜‘๎˜ƒ
๎˜ถ๎™ˆ๎™ˆ๎˜ƒ ๎šฟ๎™Š๎™˜๎™•๎™ˆ๎˜ƒ ๎˜”๎˜“๎˜‘๎˜ƒ ๎˜ณ๎™•๎™Œ๎™๎™„๎™•๎™œ๎˜ƒ ๎™๎™Œ๎™๎™Œ๎™—๎˜ƒ ๎˜ถ๎˜”๎˜“๎˜ƒ ๎™Œ๎™–๎˜ƒ ๎™š๎™Œ๎™•๎™ˆ๎™‡๎˜ƒ ๎™—๎™’๎˜ƒ ๎™—๎™‹๎™ˆ๎˜ƒ ๎™Œ๎™Š๎™‘๎™Œ๎™—๎™Œ๎™’๎™‘๎˜ƒ
control A3. Its N.C. contacts open to de-energize the igni-
tion control when excessive temperature is reached in the
blower compartment. If the limit trips the blower relay coil
๎˜ฎ๎˜–๎˜ƒ๎™š๎™Œ๎™๎™๎˜ƒ๎™…๎™ˆ๎˜ƒ๎™ˆ๎™‘๎™ˆ๎™•๎™Š๎™Œ๎™๎™ˆ๎™‡๎˜ƒ๎™…๎™œ๎˜ƒ๎™Œ๎™Š๎™‘๎™Œ๎™—๎™Œ๎™’๎™‘๎˜ƒ๎™†๎™’๎™‘๎™—๎™•๎™’๎™๎˜ƒ๎˜ค๎˜–๎˜‘๎˜ƒ๎˜ฏ๎™Œ๎™๎™Œ๎™—๎˜ƒ๎™–๎™ˆ๎™—๎™“๎™’๎™Œ๎™‘๎™—๎™–๎˜ƒ
are factory set and cannot be adjusted. See www.daven-
et.com for setpoint and replacement.
4-Flame Rollout Limit Switch S47
๎˜ฉ๎™๎™„๎™๎™ˆ๎˜ƒ๎™•๎™’๎™๎™๎™’๎™˜๎™—๎˜ƒ๎™๎™Œ๎™๎™Œ๎™—๎˜ƒ๎™–๎™š๎™Œ๎™—๎™†๎™‹๎˜ƒ ๎˜ถ๎˜—๎˜š๎˜ƒ๎™Œ๎™–๎˜ƒ๎™„๎˜ƒ ๎˜ถ๎˜ณ๎˜ถ๎˜ท๎˜ƒ๎˜ฑ๎˜‘๎˜ฆ๎˜‘๎˜ƒ๎™‹๎™Œ๎™Š๎™‹๎˜ƒ ๎™—๎™ˆ๎™-
perature limit located just above the burner air intake
๎™’๎™“๎™ˆ๎™‘๎™Œ๎™‘๎™Š๎˜ƒ๎™Œ๎™‘๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎™…๎™˜๎™•๎™‘๎™ˆ๎™•๎˜ƒ๎™ˆ๎™‘๎™†๎™๎™’๎™–๎™˜๎™•๎™ˆ๎™–๎˜ƒ๎˜‹๎™–๎™ˆ๎™ˆ๎˜ƒ๎šฟ๎™Š๎™˜๎™•๎™ˆ๎˜ƒ๎˜”๎˜“๎˜Œ๎˜‘๎˜ƒ๎˜ถ๎˜—๎˜š๎˜ƒ๎™Œ๎™–๎˜ƒ
๎™š๎™Œ๎™•๎™ˆ๎™‡๎˜ƒ๎™—๎™’๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎™Œ๎™Š๎™‘๎™Œ๎™—๎™Œ๎™’๎™‘๎˜ƒ๎™†๎™’๎™‘๎™—๎™•๎™’๎™๎˜ƒ๎˜ค๎˜–๎˜‘๎˜ƒ๎˜บ๎™‹๎™ˆ๎™‘๎˜ƒ๎˜ถ๎˜—๎˜š๎˜ƒ๎™–๎™ˆ๎™‘๎™–๎™ˆ๎™–๎˜ƒ๎›€๎™„๎™๎™ˆ๎˜ƒ
๎™•๎™’๎™๎™๎™’๎™˜๎™—๎˜ƒ ๎˜‹๎™Œ๎™‘๎™‡๎™Œ๎™†๎™„๎™—๎™Œ๎™‘๎™Š๎˜ƒ ๎™„๎˜ƒ ๎™…๎™๎™’๎™†๎™Ž๎™„๎™Š๎™ˆ๎˜ƒ ๎™Œ๎™‘๎˜ƒ ๎™—๎™‹๎™ˆ๎˜ƒ ๎™†๎™’๎™๎™…๎™˜๎™–๎™—๎™Œ๎™’๎™‘๎˜ƒ ๎™„๎™Œ๎™•๎˜ƒ ๎™“๎™„๎™–-
๎™–๎™„๎™Š๎™ˆ๎™–๎˜Œ๎˜๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎›€๎™„๎™๎™ˆ๎˜ƒ ๎™•๎™’๎™๎™๎™’๎™˜๎™—๎˜ƒ๎™๎™Œ๎™๎™Œ๎™—๎˜ƒ ๎™—๎™•๎™Œ๎™“๎™–๎˜๎˜ƒ ๎™„๎™‘๎™‡๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ ๎™Œ๎™Š๎™‘๎™Œ๎™—๎™Œ๎™’๎™‘๎˜ƒ๎™†๎™’๎™‘-
๎™—๎™•๎™’๎™๎˜ƒ๎™Œ๎™๎™๎™ˆ๎™‡๎™Œ๎™„๎™—๎™ˆ๎™๎™œ๎˜ƒ๎™†๎™๎™’๎™–๎™ˆ๎™–๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎™Š๎™„๎™–๎˜ƒ๎™™๎™„๎™๎™™๎™ˆ๎˜‘๎˜ƒ๎˜ฏ๎™Œ๎™๎™Œ๎™—๎˜ƒ๎˜ถ๎˜—๎˜š๎˜ƒ๎™Œ๎™–๎˜ƒ๎™‰๎™„๎™†๎™—๎™’๎™•๎™œ๎˜ƒ
๎™“๎™•๎™ˆ๎™–๎™ˆ๎™—๎˜ƒ๎™—๎™’๎˜ƒ๎™’๎™“๎™ˆ๎™‘๎˜ƒ๎™„๎™—๎˜ƒ๎˜–๎˜˜๎˜“๎˜ฉ๎˜ƒ๎˜Ž๎˜ƒ๎˜”๎˜—๎˜ฉ๎˜ƒ๎™’๎™‘๎˜ƒ๎™„๎˜ƒ๎™—๎™ˆ๎™๎™“๎™ˆ๎™•๎™„๎™—๎™˜๎™•๎™ˆ๎˜ƒ๎™•๎™Œ๎™–๎™ˆ๎˜ƒ๎™’๎™‘๎˜ƒ๎™„๎™๎™๎˜ƒ
๎™˜๎™‘๎™Œ๎™—๎™–๎˜‘๎˜ƒ๎˜ค๎™๎™๎˜ƒ๎›€๎™„๎™๎™ˆ๎˜ƒ๎™•๎™’๎™๎™๎™’๎™˜๎™—๎˜ƒ๎™๎™Œ๎™๎™Œ๎™—๎™–๎˜ƒ๎™„๎™•๎™ˆ๎˜ƒ๎™๎™„๎™‘๎™˜๎™„๎™๎˜ƒ๎™•๎™ˆ๎™–๎™ˆ๎™—๎˜‘
5-Combustion Air Prove Switch S18
๎˜ณ๎™•๎™’๎™™๎™ˆ๎˜ƒ ๎™–๎™š๎™Œ๎™—๎™†๎™‹๎˜ƒ ๎˜ถ๎˜”๎˜›๎˜ƒ ๎™Œ๎™–๎˜ƒ ๎™„๎˜ƒ ๎˜ถ๎˜ณ๎˜ถ๎˜ท๎˜ƒ ๎˜ฑ๎˜‘๎˜ฒ๎˜‘๎˜ƒ ๎™–๎™š๎™Œ๎™—๎™†๎™‹๎˜ƒ ๎™๎™’๎™†๎™„๎™—๎™ˆ๎™‡๎˜ƒ ๎™—๎™’๎˜ƒ ๎™—๎™‹๎™ˆ๎˜ƒ
๎™•๎™Œ๎™Š๎™‹๎™—๎˜ƒ ๎™’๎™‰๎˜ƒ ๎™—๎™‹๎™ˆ๎˜ƒ ๎™Œ๎™‘๎™‡๎™˜๎™†๎™ˆ๎™‡๎˜ƒ ๎™‡๎™•๎™„๎™‰๎™—๎˜ƒ ๎™„๎™–๎™–๎™ˆ๎™๎™…๎™๎™œ๎˜‘๎˜ƒ ๎˜ถ๎™ˆ๎™ˆ๎˜ƒ ๎šฟ๎™Š๎™˜๎™•๎™ˆ๎˜ƒ ๎˜”๎˜”๎˜‘๎˜ƒ ๎˜ถ๎˜”๎˜›๎˜ƒ
๎™๎™’๎™‘๎™Œ๎™—๎™’๎™•๎™–๎˜ƒ ๎™†๎™’๎™๎™…๎™˜๎™–๎™—๎™Œ๎™’๎™‘๎˜ƒ ๎™„๎™Œ๎™•๎˜ƒ ๎™Œ๎™‘๎™‡๎™˜๎™†๎™ˆ๎™•๎˜ƒ ๎™’๎™“๎™ˆ๎™•๎™„๎™—๎™Œ๎™’๎™‘๎˜‘๎˜ƒ ๎˜ถ๎™š๎™Œ๎™—๎™†๎™‹๎˜ƒ ๎˜ถ๎˜”๎˜›๎˜ƒ
is wired to the ignition control A3. The switch closes at
๎™‘๎™ˆ๎™Š๎™„๎™—๎™Œ๎™™๎™ˆ๎˜ƒ๎˜“๎˜‘๎˜•๎˜˜๎šด๎˜บ๎˜‘๎˜ฆ๎˜‘๎˜ƒ๎˜Ž๎˜ƒ๎˜“๎˜‘๎˜“๎˜˜๎šด๎˜ƒ๎˜‹๎˜™๎˜•๎˜‘๎˜•๎˜ƒ๎˜ณ๎™„๎˜ƒ๎˜Ž๎˜ƒ๎˜”๎˜•๎˜‘๎˜—๎˜ƒ๎˜ณ๎™„๎˜Œ๎˜ƒ๎™’๎™‘๎˜ƒ๎™“๎™•๎™ˆ๎™–-
sure fall. This negative pressure fall and switch actuation
๎™„๎™๎™๎™’๎™š๎™–๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎™Œ๎™Š๎™‘๎™Œ๎™—๎™Œ๎™’๎™‘๎˜ƒ๎™–๎™ˆ๎™”๎™˜๎™ˆ๎™‘๎™†๎™ˆ๎˜ƒ๎™—๎™’๎˜ƒ๎™†๎™’๎™‘๎™—๎™Œ๎™‘๎™˜๎™ˆ๎˜ƒ๎˜‹๎™“๎™•๎™’๎™™๎™ˆ๎™–๎˜๎˜ƒ๎™…๎™œ๎˜ƒ๎™†๎™๎™’๎™–-
๎™Œ๎™‘๎™Š๎˜๎˜ƒ ๎™—๎™‹๎™„๎™—๎˜ƒ ๎™—๎™‹๎™ˆ๎˜ƒ ๎™†๎™’๎™๎™…๎™˜๎™–๎™—๎™Œ๎™’๎™‘๎˜ƒ ๎™„๎™Œ๎™•๎˜ƒ ๎™Œ๎™‘๎™‡๎™˜๎™†๎™ˆ๎™•๎˜ƒ ๎™Œ๎™–๎˜ƒ ๎™’๎™“๎™ˆ๎™•๎™„๎™—๎™Œ๎™‘๎™Š๎˜ƒ ๎™…๎™ˆ๎™‰๎™’๎™•๎™ˆ๎˜ƒ
๎™„๎™๎™๎™’๎™š๎™Œ๎™‘๎™Š๎˜ƒ๎™—๎™‹๎™ˆ๎˜ƒ๎™Š๎™„๎™–๎˜ƒ๎™™๎™„๎™๎™™๎™ˆ๎˜ƒ๎™—๎™’๎˜ƒ๎™’๎™“๎™ˆ๎™‘๎˜‘๎˜Œ๎˜ƒ๎˜ท๎™‹๎™ˆ๎˜ƒ๎™†๎™’๎™๎™…๎™˜๎™–๎™—๎™Œ๎™’๎™‘๎˜ƒ๎™„๎™Œ๎™•๎˜ƒ๎™“๎™•๎™’๎™™๎™ˆ๎˜ƒ
switch is factory set and not adjustable.

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Lennox ZGB Series Specifications

General IconGeneral
BrandLennox
ModelZGB Series
CategoryAir Conditioner
LanguageEnglish

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