CleaverBrooks CFC-500 Operation, Service And Parts Manual page 149

The Hydronic Central Heating function is implemented as
shown in Fig. 8.
ENVIRACOM REMOTE
STAT (ON/OFF
MESSAGE, WITH
TIMEOUT)
OUTLET
INTLET
4-20 mA
HEADER
4-20 mA
MINIMUM WATER 4-20 mA TO
PRESSURE SETPOINT
SETPOINT
TOD
SETPOINT
TOD
OUTDOOR
MAX OUTDOOR
SENSOR IS OK
The function of each parameter and feature is given below.
Parameter
CH demand switch
CH sensor
CH setpoint
CH ENABLE
STAT
LCI
1
CH SENSOR SELECT
PRESSURE SENSOR TYPE: 0-15 PSI OR 0-150 PSI
CONVERSION
A
ODR ENABLE
MAX INDOOR
ODR SETPOINT
Fig. 8. Central heating hydronic diagram.
Table 8. Central Heating Hydronic Parameters.
STAT, LCI, Sensor Only, EnviraCOM Remote STAT J7-3 120 Vac
The CH demand switch may be selected from four options. In all cases, for burner demand to
exist, the sensor must be generating a demand as determined by values.
• When "Sensor Only" is chosen, no other input is considered and pump demand is derived
from burner demand.
• When "STAT" is chosen, the STAT input (J8 Terminal 3) in the On condition creates pump
demand and it also must be on for burner demand to exist; if it is off there is no demand.
• When "LCI" is chosen, the LCI input (J6 Terminal 3) in the On condition creates pump
demand and it also must be on for burner demand to exist; if it is off there is no demand.
Outlet, Inlet
The sensor used for modulation and demand may be the Outlet sensor, the 4-20 mA Header
or inlet sensor.
Degrees or None
This setpoint is used when the time-of-day input is off. If the ODR function is inactive, the
setpoint is used as-is.
If the ODR function is active (input on J10-2), this setpoint provides one coordinate for the
outdoor reset curve, as described in "Outdoor Reset and Boost" on page 26.
CH DEMAND SOURCE
SETTINGS ARE:
TOP: STAT AND SENSOR
REMOTE STAT AND SENSOR
LCI AND SENSOR
BOTTOM: SENSOR ONLY
HYSTERESIS
BURNER
TIME SINCE:
STATE: ON/OFF
BURNER TURN-ON
BURNER TURN-OFF
A
ON HYSTERESIS
OFF HYSTERESIS
PID
P-GAIN
RESTART (RESTART
INTEGRATOR WHENEVER
A LIMIT OR OVERRIDE
I-GAIN
ENDS, OR TURN-ON
OCCURS.)
D-GAIN
Comment
25
CH PUMP
DEMAND
CH BURNER
DEMAND
CH FIRING RATE
SETPOINT DEMAND
4-20 mA TO
PRATE
CH 4-20 mA REMOTE CONTROL
SETTINGS ARE:
DISABLE
SETPOINT
MODULATION
SENSOR TERMINALS
INPUT
PARAMETER
"PRATE" = 0 TO 99.99% OF CAPACITY
CB FALCON
OUTPUT
750-265