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Beckett 7600 Manuel D’Utilisation

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AquaSmart Boiler Control Manual
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75
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175
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225
250
275
300
How a Boiler Control Works
Figure 19 - Cold Start Operation (Low Limit ► OFF)
Figure 20 - Warm Start Operation (Low Limit ► ON)  
(To maintain domestic hot water temperature)
High Temperature Limit
(Adjustable 100° to 240°F)
Shuts burner off at HIGH LIMIT set point.
High Temperature Differential
(Adjustable 5° to 45°F)
Starts the burner when temperature drops to the 
HIGH LIMIT DIFFERENTIAL setting.
Example Shown:
High Limit = 200°
Differential = 20°
During a call for heat, the burner will be 
shut off at 200° and be turned back on at 
180° (200°-20°).  The circulator will 
continue to operate until the call for heat 
is satisfi ed.
Low Temperature Limit
(Adjustable 100° to 220°F)
Starts the burner at LOW LIMIT 
set point.
Low Temperature Differential
(Adjustable 10° to 45°F)
Shuts burner off when temperature rises to 
the LOW LIMIT DIFFERENTIAL setting.
High Temperature Limit
(Adjustable 100° to 240°F)
Shuts burner off at HIGH LIMIT set point.
High Temperature Differential
(Adjustable 5° to 45°F)
Starts the burner when temperature drops to the 
HIGH LIMIT DIFFERENTIAL setting.
Example Shown:
Low Limit = 140°
Differential = 10°
During the OFF cycle with no call for 
heat, the burner is turned on at 140° to 
maintain the boiler water temperature 
and is shut off at 150° (140°+10°). 
Example Shown:
High Limit = 200°
Differential = 20°
During a call for heat, the burner will be 
shut off at 200° and be turned back on at 
180° (200°-20°).  The circulator will 
continue to operate until the call for heat 
is satisfi ed.