Slant/Fin CHS-399 - Manual (Page 29)

CHS Series Controller and Display
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Slant Fin Corp.
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2.4.6 Delta T & T-rise Limits
Delta T Limits – accessed by selecting “Delta T Limits” from the “Advanced Setup” screen; Delta T is the
difference in water temperature between Inlet and Outlet of the boiler. If the temperature difference (Delta T) is
greater than 60
o
F the burner is shut off for the time specified before firing again. An initial cycle and two recycles
are allowed before Lockout occurs.
T-rise Limits – accessed by selecting “T-rise Limits” from the “Advanced Setup” screen; T-rise is the rate of
increase of the boiler Outlet temperature. If the boiler outlet temperature increases by a rate greater than
4
o
F/second the burner will recycle with a delay equal to the “Outlet T-rise delay” setting. An initial cycle and two
recycles are allowed before Lockout occurs.
Figure 2-25 Delta T & T-rise Limits Screens
Table 2-19 Delta T & T-rise Limits Parameters
Parameter Description Factory Settings
Delta T
delay * Delay time between burner cycles when Delta T limit is exceeded. Range 1 to 60
minutes.
5 min
Outlet T-rise
delay * Delay time between burner cycles when T-rise limit is exceeded. Range 1 to 60
minutes.
5 min
*=Password Protected
Outlet T-rise delay 5 min
T-rise Limits
Delta T delay 5 min
Delta T Limits