CB FALCON
31 750-265
Whenever the burner turns off, the turn-on threshold is lowered
by doubling the on hysteresis, and then increasing it by 2
degrees F per step until it reaches its original value.
The time of each step is provided by the hysteresis step time
parameter. The number of steps required to reach the original
on hysteresis is the on hysteresis value divided by
2 degrees F.
Fig. 12. Hydronic Setpoint and hysteresis.
Setpoint and Hysteresis (Steam
Control)
The Steam and LL master each have similar setpoint and
hysteresis functions. The parameters for each are separate
and independent.
Whenever the burner turns on, the turn-off threshold is raised
by 10psi (1.0 for 0-15 psi), and then it is decreased in steps.
The time of each step is provided by the hysteresis step time
parameter. If the time (T) is not-zero, then the following
schedule is followed until the off threshold reaches its original
value:
Whenever the burner turns off, the turn-on threshold is lowered
by doubling the on hysteresis, and then increasing it by 2 psi
(.2 psi for 0-15 psi) per step until it reaches its original value.
The time of each step is provided by the hysteresis step time
parameter. The number of steps required to reach the original
on hysteresis is the on hysteresis value divided by 2 psi per
step for (0–150 PSI .2 psi per step for; 0–15 PSI).
Step Time since turn-on Hydronic Turn-on threshold
1 0<=timer <1T Setpoint - 2 * On hysteresis
2 1T<=time <2T Setpoint - 2 * On hysteresis +
1*2°F
3 2T<=time <3T Setpoint - 2 * On hysteresis +
2* 2°F
4 nT<=time <(n+1)T Setpoint -2 * On hysteresis + n
* 2°F
5 (on hysteresis/
2F*T<=time
Setpoint
SETPOINT + OFF HYSTERESIS
SETPOINT
SETPOINT - ON HYSTERESIS
BURNER
+18°F
+8°F
+6°F
+4°F
+2°F
1 MINUTE
SETPOINT - 2 * ON HYSTERESIS
1 MINUTE
OFF
ON
ANTI-SHORT-CYCLE DELAY
SETPOINT AND HYSTERESIS
HST = HISTERESIS STEP TIME
(0 = DISABLE)
2°F
ANTI SHORT CYCLE DELAY TIME
(DOES NOT APPLY FOR DHW)
TOD SETPOINT
SETPOINT
ON HYST.
OFF HYST.
CH PARAMETERS
SYSTEM PARAMETER
TOD SETPOINT
SETPOINT
ON HYST.
OFF HYST.
DHW PARAMETERS
TOD SETPOINT
HYSTERESIS STEP TIME HYSTERESIS STEP TIME HYSTERESIS STEP TIME
SETPOINT
ON HYST.
OFF HYST.
LL MASTER PARAMETERS
Steam Turn-off Threshold
Step 150psi Sensor 15psi Sensor
110 1.0
2
8
0.8
3
6
0.6
4
4
0.4
5
2
0.2
6 Setpoint Setpoint
Steam Turn-on Threshold
Step 150psi Sensor 15psi Sensor
1 0<=timer<1T Setpoint - 2* On
hysteresis
2 1T<=time<2T Setpoint - 2 * On
hysteresis + .2psi
3 2T<=time<3T Setpoint - 2 * On
hysteresis + .2psi
4 nT<=time<(n+1)T Setpoint - 2 * On
hysteresis + .2psi
5 (on hysteresis/
2psi<=time)
Setpoint
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