Modulation; Modulation Sensor Parameters - CleaverBrooks CFC Operation, Service & Parts Manual

Modulation

HEADER
LL MODULATION TEMPERATURE
LL MODULATION BACKUP SENSOR
DISABLE
LEAD OUTLET
OUTLET AVERAGE
LL MASTER'S
SETPOINT
Modulation Sensor
Parameter
LL Modulation sensor
LL Modulation backup sensor
When the burner demand is off and no burners are firing then,
for either Lead Outlet or Slave Outlet Average, the lead boiler's
outlet temperature is used to monitor for burner demand.
MASTER ACTIVE SERVICE
MASTER HEAT DEMAND
LL MASTER FROST PROTECTION
FROST PROTECTION RATE
BURNER ON/OFF
DEMAND
OFF
HYSTERESIS
STAGING
ON
HYSTERESIS
ALLOCATION
RATE
PID
P-GAIN
I-GAIN
D-GAIN
Fig. 31. Modulation.
Table 39. Modulation Sensor Parameters.
S10
The LL master's modulation sensor uses the S10 sensor wired at J10 terminal 7 and 8.
If the LL master is enabled and its sensor is faulty then an alert will be issued.
Disable, Lead Outlet, Slave Outlet Average
If the sensor chosen by the LL Modulation sensor is faulty then the backup sensor provided
here may be used.
If Disable is selected then no backup will be used.
If Lead Outlet is selected then the outlet temperature of the lead boiler will be used as the
backup during firing.
If Slave Outlet Average is selected then average of the outlet temperatures of all slave
boilers that are firing will be used as a backup.
MASTER SERVICE
ALL SLAVES KNOW WHAT
THE MASTER IS DOING.
PUMP CONTROL
LL SLAVE DEMAND
SLAVE COMMAND
A UNIQUE COMMAND
RATE
IS SENT TO EACH
LL SLAVE FIRING RATE
SLAVE STATUS
EACH SLAVE TELLS LL
MASTER WHAT
Comment
81
ModBus
STATUS
USED FOR
TO
SLAVES
LL SLAVE
FROM
SLAVES
IT IS DOING
CB FALCON
750-265