CleaverBrooks CFC-500 Operation, Service And Parts Manual page 169

Parameter
T-Rise degrees per second limit
T-Rise response
T-rise delay
T-rise retry limit
Heat Exchanger High Limit
A temperature limit may be imposed on the exchanger
temperature.
Parameter
Heat exchanger high limit
Heat exchanger high limit
setpoint
Heat exchanger high limit
response
Heat exchanger high limit delay
Heat exchanger retry limit
Heat exchanger T-rise enable
Table 19. T-Rise Parameters. (Continued)
Degrees or None
For any input that has T-rise detection enabled, this parameter provides the maximum rate of
temperature increase that will be allowed. If the temperature increases at a rate greater than
this, and this rate of increase persists for 4 seconds then the response specified by T-rise
response occurs.
Lockout, recycle & delay, Recycle & delay with retry limit
Specifies response should "T-Rise degrees per second limit" is exceeded.
mm:ss or None
Specifies the delay time that occurs whenever a recycle occurs due to a T-rise event and the
specified response includes "Recycle..." The burner will remain in the Standby Hold condition
until the delay expires.
n
If the "T-rise response" specifies a retry limit, then any recycles due to reaching the
corresponding response threshold are counted. If this count ever exceeds the "n" value, then
a lockout occurs.
Table 20. Heat Exchanger High Limit Parameters.
Disable, Enable
This enables/disables temperature rise detection for the heat exchanger sensor S9 (J9
terminal 6).
If this selection is "Enable" then the Stack Connector Type must be either "10K single non-
safety NTC" or "12K single non-safety NTC." If this condition is not met then a lockout occurs
because the exchanger input requires using the Stack sensor as two separate sensors. Stack
being S8 (J9 terminal 4) and heat exchanger being S9 (J9 terminal 6).
Temperature or none
Provides the setpoint at which a response occurs if "Heat exchanger high limit" function is
enabled.
Lockout, recycle & delay, Recycle & delay with retry limit
Specifies response should "Heat exchanger high limit setpoint" threshold is reached.
mm:ss or None
Specifies the delay time that occurs whenever a recycle occurs due to a Heat exchanger high
limit event and the specified response includes "Recycle..." The burner will remain in the
Standby Hold condition until the delay expires.
n
If the "Heat exchanger high limit response" specifies a retry limit, then any recycles due to
reaching the heat exchanger high limit threshold are counted. If this count ever exceeds the
"n" value, then a lockout occurs.
Enabled, Disabled
Comment
Comment
45
CB FALCON
750-265