25 750-265
The DHW function is implemented as shown in Fig. 10.
Fig. 10. Domestic hot water function.
The DHW loop’s ability to override the normal demand priority
is described in the System Operation Settings section.
Otherwise the behavior of each parameter and feature is
given below.
OUTLET
DHW FIRING RATE
M24977
HYSTERESIS
DOMESTIC HOT WATER (DHW)
TIME SINCE:
BURNER TURN-ON
BURNER TURN-OFF
TOD
DHW
SENSOR IS SHORTED
DHW
INLET
SENSOR’S
ANALOG
VALUE
BURNER
STATE: ON/OFF
ENVIRACOM REMOTE STAT
(ON/OFF MESSAGE, WITH TIMEOUT)
DHW DEMAND SOURCE
DHW PUMP
DEMAND
DHW BURNER
DEMAND
SENSOR SIGNAL
CONDITIONING
SETTINGS ARE:
TOP: INLET SENSOR AND DHW SWITCH
2: OUTLET SENSOR AND DHW SWITCH
3: REMOTE STAT AND DHW SENSOR
BOTTOM: DHW SENSOR ONLY
1
SETPOINT DEMAND
ON HYST.
OFF HYST.
TOD SETPOINT
SETPOINT
P-GAIN
I-GAIN
D-GAIN
PID
PARAMETER
SENSOR
“PRATE” = 0 TO 99.99% OF CAPACITY
INPUT
OUTPUT
TERMINALS
DHW ENABLE
DHW HIGH
LIMIT ACTIVE
(SUSPEND DHW DURING
DHW HIGH LIMIT CONDITION)
RESTART
(RESTART INTEGRATOR
WHENEVER A LIMIT OR
OVERRIDE ENDS, OR
TURN-ON OCCURS.)
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