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Lennox SL297UHNV Series - Applications Using a Single-Stage Thermostat

Lennox SL297UHNV Series
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ξ˜³ξ™„ξ™Šξ™ˆξ˜ƒξ˜™ξ˜–
Applications Using A Single-Stage Thermostat
See FIGURE 55 for ignition control sequence
B - Heating Sequence -- Integrated Control Thermostat
Selection DIP Switch 1 ON in β€œSingle-Stage” Position
NOTE - In these applications, two-stage heat will be initi-
ated by the integrated control if heating demand has not
been satised after the eld adjustable period (7 or 12
minutes).
1 - ξ˜ƒξ˜²ξ™‘ξ˜ƒ ξ™„ξ˜ƒ ξ™†ξ™„ξ™ξ™ξ˜ƒ ξ™‰ξ™’ξ™•ξ˜ƒ ξ™‹ξ™ˆξ™„ξ™—ξ˜ξ˜ƒ ξ™—ξ™‹ξ™ˆξ™•ξ™ξ™’ξ™–ξ™—ξ™„ξ™—ξ˜ƒ ξšΏξ™•ξ™–ξ™—ξ˜ξ™–ξ™—ξ™„ξ™Šξ™ˆξ˜ƒ ξ™†ξ™’ξ™‘ξ™—ξ™„ξ™†ξ™—ξ™–ξ˜ƒ
ξ™†ξ™ξ™’ξ™–ξ™ˆξ˜ƒξ™–ξ™ˆξ™‘ξ™‡ξ™Œξ™‘ξ™Šξ˜ƒξ™„ξ˜ƒξ™–ξ™Œξ™Šξ™‘ξ™„ξ™ξ˜ƒξ™—ξ™’ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™Œξ™‘ξ™—ξ™ˆξ™Šξ™•ξ™„ξ™—ξ™ˆξ™‡ξ˜ƒξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ˜‘ξ˜ƒξ˜·ξ™‹ξ™ˆξ˜ƒ
ξ™Œξ™‘ξ™—ξ™ˆξ™Šξ™•ξ™„ξ™—ξ™ˆξ™‡ξ˜ƒ ξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ˜ƒ ξ™•ξ™˜ξ™‘ξ™–ξ˜ƒ ξ™„ξ˜ƒ ξ™–ξ™ˆξ™ξ™‰ξ˜ξ™‡ξ™Œξ™„ξ™Šξ™‘ξ™’ξ™–ξ™—ξ™Œξ™†ξ˜ƒ ξ™“ξ™•ξ™’ξ™Šξ™•ξ™„ξ™ξ˜ƒ
ξ™„ξ™‘ξ™‡ξ˜ƒ ξ™†ξ™‹ξ™ˆξ™†ξ™Žξ™–ξ˜ƒ ξ™‹ξ™Œξ™Šξ™‹ξ˜ƒ ξ™—ξ™ˆξ™ξ™“ξ™ˆξ™•ξ™„ξ™—ξ™˜ξ™•ξ™ˆξ˜ƒ ξ™ξ™Œξ™ξ™Œξ™—ξ˜ƒ ξ™–ξ™šξ™Œξ™—ξ™†ξ™‹ξ™ˆξ™–ξ˜ƒ ξ™‰ξ™’ξ™•ξ˜ƒ
ξ™‘ξ™’ξ™•ξ™ξ™„ξ™ξ™ξ™œξ˜ƒξ™†ξ™ξ™’ξ™–ξ™ˆξ™‡ξ˜ƒξ™†ξ™’ξ™‘ξ™—ξ™„ξ™†ξ™—ξ™–ξ˜ƒξ™„ξ™‘ξ™‡ξ˜ƒξ™“ξ™•ξ™ˆξ™–ξ™–ξ™˜ξ™•ξ™ˆξ˜ƒξ™–ξ™šξ™Œξ™—ξ™†ξ™‹ξ™ˆξ™–ξ˜ƒξ™‰ξ™’ξ™•ξ˜ƒ
ξ™‘ξ™’ξ™•ξ™ξ™„ξ™ξ™ξ™œξ˜ƒξ™’ξ™“ξ™ˆξ™‘ξ˜ƒξ™†ξ™’ξ™‘ξ™—ξ™„ξ™†ξ™—ξ™–ξ˜‘ξ˜ƒξ˜·ξ™‹ξ™ˆξ˜ƒξ™†ξ™’ξ™ξ™…ξ™˜ξ™–ξ™—ξ™Œξ™’ξ™‘ξ˜ƒξ™„ξ™Œξ™•ξ˜ƒξ™Œξ™‘ξ™‡ξ™˜ξ™†ξ™ˆξ™•ξ˜ƒ
ξ™Œξ™–ξ˜ƒξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™‡ξ˜ƒξ™„ξ™—ξ˜ƒξ™ξ™’ξ™šξ˜ƒξ™–ξ™“ξ™ˆξ™ˆξ™‡ξ˜‘
2 - ξ˜ƒξ˜²ξ™‘ξ™†ξ™ˆξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ˜ƒ ξ™•ξ™ˆξ™†ξ™ˆξ™Œξ™™ξ™ˆξ™–ξ˜ƒ ξ™„ξ˜ƒ ξ™–ξ™Œξ™Šξ™‘ξ™„ξ™ξ˜ƒ ξ™—ξ™‹ξ™„ξ™—ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™ξ™’ξ™šξ˜ƒ
ξ™“ξ™•ξ™ˆξ™–ξ™–ξ™˜ξ™•ξ™ˆξ˜ƒ ξ™–ξ™šξ™Œξ™—ξ™†ξ™‹ξ˜ƒ ξ™‹ξ™„ξ™–ξ˜ƒ ξ™†ξ™ξ™’ξ™–ξ™ˆξ™‡ξ˜ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™†ξ™’ξ™ξ™…ξ™˜ξ™–ξ™—ξ™Œξ™’ξ™‘ξ˜ƒ ξ™„ξ™Œξ™•ξ˜ƒ
ξ™Œξ™‘ξ™‡ξ™˜ξ™†ξ™ˆξ™•ξ˜ƒξ™…ξ™ˆξ™Šξ™Œξ™‘ξ™–ξ˜ƒξ™„ξ˜ƒξ˜”ξ˜˜ξ˜ξ™–ξ™ˆξ™†ξ™’ξ™‘ξ™‡ξ˜ƒξ™“ξ™•ξ™ˆξ˜ξ™“ξ™˜ξ™•ξ™Šξ™ˆξ˜ƒξ™Œξ™‘ξ˜ƒξ™ξ™’ξ™šξ˜ƒξ™–ξ™“ξ™ˆξ™ˆξ™‡ξ˜‘
NOTE - If the low re pressure switch does not close
the combustion air inducer will switch to high re.
After a 15 second pre-purge the high re pressure
switch will close and the unit will begin operation on
high re. After 10 to 20 seconds of high re operation
the unit will switch to low re.
ξ˜–ξ˜ƒξ˜ξ˜ƒ ξ˜ƒξ˜ƒξ˜€ξ™‰ξ™—ξ™ˆξ™•ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™“ξ™•ξ™ˆξ˜ξ™“ξ™˜ξ™•ξ™Šξ™ˆξ˜ƒξ™Œξ™–ξ˜ƒξ™†ξ™’ξ™ξ™“ξ™ξ™ˆξ™—ξ™ˆξ˜ξ˜ƒξ™„ξ˜ƒξ˜•ξ˜“ξ˜ξ™–ξ™ˆξ™†ξ™’ξ™‘ξ™‡ξ˜ƒξ™Œξ™‘ξ™Œξ™—ξ™Œξ™„ξ™ξ˜ƒ
ξ™Œξ™Šξ™‘ξ™Œξ™—ξ™’ξ™•ξ˜ƒξ™šξ™„ξ™•ξ™ξ˜ξ™˜ξ™“ξ˜ƒξ™“ξ™ˆξ™•ξ™Œξ™’ξ™‡ξ˜ƒξ™…ξ™ˆξ™Šξ™Œξ™‘ξ™–ξ˜‘ξ˜ƒξ˜·ξ™‹ξ™ˆξ˜ƒξ™†ξ™’ξ™ξ™…ξ™˜ξ™–ξ™—ξ™Œξ™’ξ™‘ξ˜ƒξ™„ξ™Œξ™•ξ˜ƒ
ξ™Œξ™‘ξ™‡ξ™˜ξ™†ξ™ˆξ™•ξ˜ƒξ™†ξ™’ξ™‘ξ™—ξ™Œξ™‘ξ™˜ξ™ˆξ™–ξ˜ƒξ™—ξ™’ξ˜ƒξ™’ξ™“ξ™ˆξ™•ξ™„ξ™—ξ™ˆξ˜ƒξ™„ξ™—ξ˜ƒξ™ξ™’ξ™šξ˜ƒξ™–ξ™“ξ™ˆξ™ˆξ™‡ξ˜‘
4 - ξ˜ƒξ˜ƒξ˜€ξ™‰ξ™—ξ™ˆξ™•ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ˜•ξ˜“ξ˜ξ™–ξ™ˆξ™†ξ™’ξ™‘ξ™‡ξ˜ƒ ξ™šξ™„ξ™•ξ™ξ˜ξ™˜ξ™“ξ˜ƒ ξ™“ξ™ˆξ™•ξ™Œξ™’ξ™‡ξ˜ƒ ξ™‹ξ™„ξ™–ξ˜ƒ ξ™ˆξ™‘ξ™‡ξ™ˆξ™‡ξ˜ξ˜ƒ
ξ™—ξ™‹ξ™ˆξ˜ƒξ™Šξ™„ξ™–ξ˜ƒξ™™ξ™„ξ™ξ™™ξ™ˆξ˜ƒξ™Œξ™–ξ˜ƒξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™‡ξ˜ƒ ξ™’ξ™‘ξ˜ƒξ™ξ™’ξ™šξ˜ƒξšΏξ™•ξ™ˆξ˜ƒξ˜‹ξšΏξ™•ξ™–ξ™—ξ˜ƒξ™–ξ™—ξ™„ξ™Šξ™ˆξ˜Œξ˜ƒ
ξ™„ξ™‘ξ™‡ξ˜ƒ ξ™Œξ™Šξ™‘ξ™Œξ™—ξ™Œξ™’ξ™‘ξ˜ƒ ξ™’ξ™†ξ™†ξ™˜ξ™•ξ™–ξ˜‘ξ˜ƒξ˜€ξ™—ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™–ξ™„ξ™ξ™ˆξ˜ƒ ξ™—ξ™Œξ™ξ™ˆξ˜ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ˜ƒ
ξ™ξ™’ξ™‡ξ™˜ξ™ξ™ˆξ˜ƒ ξ™–ξ™ˆξ™‘ξ™‡ξ™–ξ˜ƒ ξ™„ξ˜ƒ ξ™–ξ™Œξ™Šξ™‘ξ™„ξ™ξ˜ƒ ξ™—ξ™’ξ˜ƒ ξ™…ξ™ˆξ™Šξ™Œξ™‘ξ˜ƒ ξ™„ξ™‘ξ˜ƒ ξ™Œξ™‘ξ™‡ξ™’ξ™’ξ™•ξ˜ƒ ξ™…ξ™ξ™’ξ™šξ™ˆξ™•ξ˜ƒ
ξ˜–ξ˜“ξ˜ξ™–ξ™ˆξ™†ξ™’ξ™‘ξ™‡ξ˜ƒ ξ˜²ξ˜±ξ˜ξ™‡ξ™ˆξ™ξ™„ξ™œξ˜‘ξ˜ƒ ξ˜Ίξ™‹ξ™ˆξ™‘ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™‡ξ™ˆξ™ξ™„ξ™œξ˜ƒ ξ™ˆξ™‘ξ™‡ξ™–ξ˜ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ
ξ™Œξ™‘ξ™‡ξ™’ξ™’ξ™•ξ˜ƒ ξ™…ξ™ξ™’ξ™šξ™ˆξ™•ξ˜ƒ ξ™ξ™’ξ™—ξ™’ξ™•ξ˜ƒ ξ™Œξ™–ξ˜ƒ ξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™‡ξ˜ƒ ξ™’ξ™‘ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™ξ™’ξ™šξ˜ƒ ξšΏξ™•ξ™ˆξ˜ƒ
ξ™‹ξ™ˆξ™„ξ™—ξ™Œξ™‘ξ™Šξ˜ƒξ™–ξ™“ξ™ˆξ™ˆξ™‡ξ˜ƒξ™„ξ™‘ξ™‡ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ˜«ξ˜Έξ˜°ξ˜ƒξ™†ξ™’ξ™‘ξ™—ξ™„ξ™†ξ™—ξ™–ξ˜ƒξ™„ξ™•ξ™ˆξ˜ƒξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™‡ξ˜‘ξ˜ƒ
ξ˜·ξ™‹ξ™ˆξ˜ƒξ™Œξ™‘ξ™—ξ™ˆξ™Šξ™•ξ™„ξ™—ξ™ˆξ™‡ξ˜ƒξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ˜ƒξ™„ξ™ξ™–ξ™’ξ˜ƒξ™Œξ™‘ξ™Œξ™—ξ™Œξ™„ξ™—ξ™ˆξ™–ξ˜ƒξ™„ξ˜ƒξ™–ξ™ˆξ™†ξ™’ξ™‘ξ™‡ξ˜ξ™–ξ™—ξ™„ξ™Šξ™ˆξ˜ƒ
ξ™’ξ™‘ξ˜ƒξ™‡ξ™ˆξ™ξ™„ξ™œξ˜ƒξ˜‹ξ™‰ξ™„ξ™†ξ™—ξ™’ξ™•ξ™œξ˜ξ™–ξ™ˆξ™—ξ˜ƒξ™„ξ™—ξ˜ƒξ˜šξ˜ƒξ™ξ™Œξ™‘ξ™˜ξ™—ξ™ˆξ™–ξ˜žξ˜ƒξ™„ξ™‡ξ™ξ™˜ξ™–ξ™—ξ™„ξ™…ξ™ξ™ˆξ˜ƒξ™—ξ™’ξ˜ƒξ˜”ξ˜•ξ˜ƒ
ξ™ξ™Œξ™‘ξ™˜ξ™—ξ™ˆξ™–ξ˜Œξ˜‘
ξ˜˜ξ˜ƒξ˜ξ˜ƒ ξ˜ƒξ˜¬ξ™‰ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™‹ξ™ˆξ™„ξ™—ξ™Œξ™‘ξ™Šξ˜ƒ ξ™‡ξ™ˆξ™ξ™„ξ™‘ξ™‡ξ˜ƒ ξ™†ξ™’ξ™‘ξ™—ξ™Œξ™‘ξ™˜ξ™ˆξ™–ξ˜ƒ ξ™…ξ™ˆξ™œξ™’ξ™‘ξ™‡ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ
ξ™–ξ™ˆξ™†ξ™’ξ™‘ξ™‡ξ™–ξ™—ξ™„ξ™Šξ™ˆξ˜ƒ ξ™’ξ™‘ξ˜ƒ ξ™‡ξ™ˆξ™ξ™„ξ™œξ˜ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™Œξ™‘ξ™—ξ™ˆξ™Šξ™•ξ™„ξ™—ξ™ˆξ™‡ξ˜ƒ ξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ˜ƒ
ξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™–ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™†ξ™’ξ™ξ™…ξ™˜ξ™–ξ™—ξ™Œξ™’ξ™‘ξ˜ƒξ™„ξ™Œξ™•ξ˜ƒξ™Œξ™‘ξ™‡ξ™˜ξ™†ξ™ˆξ™•ξ˜ƒξ™„ξ™—ξ˜ƒξ™‹ξ™Œξ™Šξ™‹ξ˜ƒξ™–ξ™“ξ™ˆξ™ˆξ™‡ξ˜‘ξ˜ƒ
ξ˜·ξ™‹ξ™ˆξ˜ƒξ™†ξ™’ξ™‘ξ™—ξ™•ξ™’ξ™ξ˜ƒξ™„ξ™ξ™–ξ™’ξ˜ƒξ™†ξ™‹ξ™ˆξ™†ξ™Žξ™–ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒξ™‹ξ™Œξ™Šξ™‹ξ˜ƒξšΏξ™•ξ™ˆξ˜ƒξ˜‹ξ™–ξ™ˆξ™†ξ™’ξ™‘ξ™‡ξ˜ƒξ™–ξ™—ξ™„ξ™Šξ™ˆξ˜Œξ˜ƒ
ξ™“ξ™•ξ™ˆξ™–ξ™–ξ™˜ξ™•ξ™ˆξ˜ƒξ™–ξ™šξ™Œξ™—ξ™†ξ™‹ξ˜ƒξ™—ξ™’ξ˜ƒξ™ξ™„ξ™Žξ™ˆξ˜ƒξ™–ξ™˜ξ™•ξ™ˆξ˜ƒξ™Œξ™—ξ˜ƒξ™Œξ™–ξ˜ƒξ™†ξ™ξ™’ξ™–ξ™ˆξ™‡ξ˜‘ξ˜ƒξ˜·ξ™‹ξ™ˆξ˜ƒξ™‹ξ™Œξ™Šξ™‹ξ˜ƒ
ξšΏξ™•ξ™ˆξ˜ƒξ˜‹ξ™–ξ™ˆξ™†ξ™’ξ™‘ξ™‡ξ˜ƒξ™–ξ™—ξ™„ξ™Šξ™ˆξ˜Œξ˜ƒξ™Šξ™„ξ™–ξ˜ƒξ™™ξ™„ξ™ξ™™ξ™ˆξ˜ƒξ™Œξ™–ξ˜ƒξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™‡ξ˜ƒξ™„ξ™‘ξ™‡ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒ
ξ™Œξ™‘ξ™‡ξ™’ξ™’ξ™•ξ˜ƒ ξ™…ξ™ξ™’ξ™šξ™ˆξ™•ξ˜ƒ ξ™ξ™’ξ™—ξ™’ξ™•ξ˜ƒ ξ™Œξ™–ξ˜ƒ ξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™‡ξ˜ƒ ξ™‰ξ™’ξ™•ξ˜ƒ ξ™’ξ™“ξ™ˆξ™•ξ™„ξ™—ξ™Œξ™’ξ™‘ξ˜ƒ ξ™„ξ™—ξ˜ƒ
ξ™—ξ™‹ξ™ˆξ˜ƒξ™‹ξ™Œξ™Šξ™‹ξ˜ƒξšΏξ™•ξ™ˆξ˜ƒξ™‹ξ™ˆξ™„ξ™—ξ™Œξ™‘ξ™Šξ˜ƒξ™–ξ™“ξ™ˆξ™ˆξ™‡ξ˜‘
ξ˜™ξ˜ƒξ˜ξ˜ƒ ξ˜ƒξ˜Ίξ™‹ξ™ˆξ™‘ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒ ξ™—ξ™‹ξ™ˆξ™•ξ™ξ™’ξ™–ξ™—ξ™„ξ™—ξ˜ƒξ™‹ξ™ˆξ™„ξ™—ξ™Œξ™‘ξ™Šξ˜ƒ ξ™‡ξ™ˆξ™ξ™„ξ™‘ξ™‡ξ˜ƒξ™Œξ™–ξ˜ƒ ξ™–ξ™„ξ™—ξ™Œξ™–ξšΏξ™ˆξ™‡ξ˜ξ˜ƒ
ξ™—ξ™‹ξ™ˆξ˜ƒξ™†ξ™’ξ™ξ™…ξ™˜ξ™–ξ™—ξ™Œξ™’ξ™‘ξ˜ƒξ™„ξ™Œξ™•ξ˜ƒξ™Œξ™‘ξ™‡ξ™˜ξ™†ξ™ˆξ™•ξ˜ƒξ™…ξ™ˆξ™Šξ™Œξ™‘ξ™–ξ˜ƒξ™„ξ˜ƒξ˜˜ξ˜ξ™–ξ™ˆξ™†ξ™’ξ™‘ξ™‡ξ˜ƒξ™ξ™’ξ™šξ˜ƒ
ξ™–ξ™“ξ™ˆξ™ˆξ™‡ξ˜ƒξ™“ξ™’ξ™–ξ™—ξ˜ξ™“ξ™˜ξ™•ξ™Šξ™ˆξ˜‘ξ˜ƒξ˜·ξ™‹ξ™ˆξ˜ƒξšΏξ™ˆξ™ξ™‡ξ˜ξ™–ξ™ˆξ™ξ™ˆξ™†ξ™—ξ™ˆξ™‡ξ˜ƒξ™Œξ™‘ξ™‡ξ™’ξ™’ξ™•ξ˜ƒξ™…ξ™ξ™’ξ™šξ™ˆξ™•ξ˜ƒ
ξ™’σ°€¨ξ˜ƒξ™‡ξ™ˆξ™ξ™„ξ™œξ˜ƒξ™…ξ™ˆξ™Šξ™Œξ™‘ξ™–ξ˜‘ξ˜ƒξ˜·ξ™‹ξ™ˆξ˜ƒξ™Œξ™‘ξ™‡ξ™’ξ™’ξ™•ξ˜ƒξ™…ξ™ξ™’ξ™šξ™ˆξ™•ξ˜ƒξ™’ξ™“ξ™ˆξ™•ξ™„ξ™—ξ™ˆξ™–ξ˜ƒξ™„ξ™—ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒ
ξ™ξ™’ξ™šξ˜ξšΏξ™•ξ™ˆξ˜ƒξ™‹ξ™ˆξ™„ξ™—ξ™Œξ™‘ξ™Šξ˜ƒξ™–ξ™“ξ™ˆξ™ˆξ™‡ξ˜‘
7 - ξ˜ƒξ˜Ίξ™‹ξ™ˆξ™‘ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™†ξ™’ξ™ξ™…ξ™˜ξ™–ξ™—ξ™Œξ™’ξ™‘ξ˜ƒ ξ™„ξ™Œξ™•ξ˜ƒ ξ™“ξ™’ξ™–ξ™—ξ˜ξ™“ξ™˜ξ™•ξ™Šξ™ˆξ˜ƒ ξ™“ξ™ˆξ™•ξ™Œξ™’ξ™‡ξ˜ƒ ξ™Œξ™–ξ˜ƒ
ξ™†ξ™’ξ™ξ™“ξ™ξ™ˆξ™—ξ™ˆξ˜ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ™Œξ™‘ξ™‡ξ™˜ξ™†ξ™ˆξ™•ξ˜ƒ ξ™„ξ™‘ξ™‡ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒ ξ˜«ξ˜Έξ˜°ξ˜ƒ ξ™†ξ™’ξ™‘ξ™—ξ™„ξ™†ξ™—ξ™–ξ˜ƒ ξ™„ξ™•ξ™ˆξ˜ƒ
ξ™‡ξ™ˆξ˜ξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™‡ξ˜‘ξ˜ƒξ˜·ξ™‹ξ™ˆξ˜ƒξ™Œξ™‘ξ™‡ξ™’ξ™’ξ™•ξ˜ƒξ™…ξ™ξ™’ξ™šξ™ˆξ™•ξ˜ƒξ™Œξ™–ξ˜ƒξ™‡ξ™ˆξ˜ξ™ˆξ™‘ξ™ˆξ™•ξ™Šξ™Œξ™ξ™ˆξ™‡ξ˜ƒξ™„ξ™—ξ˜ƒ
ξ™—ξ™‹ξ™ˆξ˜ƒξ™ˆξ™‘ξ™‡ξ˜ƒ ξ™’ξ™‰ξ˜ƒξ™—ξ™‹ξ™ˆξ˜ƒ ξ™’σ°€¨ξ˜ƒξ™‡ξ™ˆξ™ξ™„ξ™œξ˜ƒξ™„ξ™–ξ˜ƒξ™šξ™ˆξ™ξ™ξ˜ƒξ™„ξ™–ξ˜ƒ ξ™—ξ™‹ξ™ˆξ˜ƒξ˜”ξ˜•ξ˜“ξ˜Ήξ˜ƒξ˜€ξ˜¦ξ˜¦ξ˜ƒ
ξ™—ξ™ˆξ™•ξ™ξ™Œξ™‘ξ™„ξ™ξ™–ξ˜‘
1 stg heat demand
2 stg heat demand
15
ON
OFF
low speed CAI
35
1
Pre-Purge
Ignitor Warm-up
30* second
blower
β€œon” delay
Post
Purge
5 SEC80
ignitor
HEATING OPERATION WITH TWO-STAGE THERMOSTAT
low fire gas valve
indoor blower low heat
high speed CAI
high fire gas valve
indoor blower high heat
39
Trial For
Ignition
blower
β€œoff”
delay
RECOGNITION PERIOD
30 seconds
* Conventional thermostat 30 seconds, communicating thermostat set for 30 adjustable 15 to 45 seconds.
FIGURE 54
heat demand
15
ON
OFF
low speed CAI
35
1
Pre-Purge
Ignitor Warm-up
30* second
blower
β€œon” delay
Post
Purge
5 SEC
80
ignitor
HEATING OPERATION WITH SINGLE STAGE THERMOSTAT
low fire gas valve
high speed CAI
high fire gas valve
indoor blower high heat
39
Trial For
Ignition
7 or 12 minutes after heating demand begins, furnace switches to high fire (depends on setting)
blowe
r
β€œoff”
delay
indoor blower low heat
* Conventional thermostat 30 seconds, communicating thermostat set for 30 adjustable 15 to 45 seconds.
FIGURE 55

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