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Rev 2.1
5-8 Delta-T Limit Related Configuration
5-8.1 To Enable Or Disable Delta-T Limit
Configure Delta T Inlet to Outlet Flow Delta-T Enable Textbox (Default: No Delta-T)
x Select Enable to enable Delta-T limit
x Select Disable to disable Delta-T limit
This parameter enables or disables the entire delta-T limit function.
5-8.2 To Change Delta-T Limit Delay
Configure Delta T Inlet to Outlet Flow Delta-T Delay Textbox (Default: 5m0s)
x Type in desired time between 0 to 5 minutes
This parameter provides the delay time for the Delta-T limit.
5-8.3 To Change Delta-T Limit Response
Configure Delta T Inlet to Outlet Flow Delta-T Limit Response Textbox (Default: Lockout)
x Select Lockout to lockout in event of Delta-T limit
x Select Recycle & delay to recycle and delay in event of Delta-T limit
x Select Recycle & delay with retry limit to recycle and delay in event of Delta-T limit up to Delta-T retry limit
If the temperature difference exceeds the limit and Recycle and delay is selected then the burner control recycles and
holds while waiting for a delay (see the Delta-T Limit Delay parameter) to expire.
5-8.4 To Change Delta-T Limit Degrees
Configure Delta T Inlet to Outlet Flow Delta-T Degrees Textbox (Default: A050-A075: 47, A100: 63, A150: 94,
A200: 63, A250: 79, A300: 94)
x Type in desired temperature
If the outlet is hotter than the inlet temperature by the amount given by this parameter, the response defined for the
Delta-T Limit Response will occur. Stepped Modulation Limiting will occur as the temperature approaches this limit.
5-8.5 To Change Delta-T Retry Limit
Configure Delta T Inlet to Outlet Flow Delta-T Retry Limit Textbox (Default: 10)
x Type in desired retry limit
How many of retry will be tolerated. If demand I not satisfied and this number of recycles had happened, then lockout
occurs.
5-8.6 To Enable Delta-T Rate Limit
Configure Delta T Inlet to Outlet Flow Delta-T Rate Limit Enable Textbox (Default: Disabled)
x Select Enable to enable Delta-T rate limit
x Select Disable to disable Delta-T rate limit
Enabling this parameter causes Stepped modulation to occur as Delta-T temperature limit approached.
5-8.7 To Change Delta-T Inverse Limit Time
Configure Delta T Inlet to Outlet Flow Delta-T Inverse Limit Time Textbox (Default: 30m0s)
x Type in desired time
When temperature inversion detection is enabled for a pair of sensors, this parameter specifies a time during with this will
be tolerated.
5-8.8 To Change Delta-T Inverse Limit Response
Configure Delta T Inlet to Outlet Flow Delta-T Inverse Limit Response Textbox
(Default: Recycle & delay)
x Select Lockout to lockout in event of Delta-T inverse limit
x Select Recycle & delay to recycle and delay in event of Delta-T inverse limit
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