HeatNet Smith Series, Руководство пользователя, Страница: 49 / 82

DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control REV 1.38-1
Page 49
MENU
DEFAULT
VALUE
RANGE DESCRIPTION
HEAT EXCHANGER
ALARM TYPE: WARNING
This setting determines the way in which the control reacts
when the differential temperature across the heat exchanger
exceeds the specified maximum differential temperature. The
default alarm condition is a WARNING. The WARNING state
will allow the boiler to keep functioning and display a warning
message and a timestamp in the status screen when the
maximum differential temperature is exceeded. If FAULT is
selected, the boiler will shut down and act as if an interlock
has tripped. After the Delta T has dropped by 10F the boiler
will restart if the demand is still present.
EXCHR DELTA T
40 ° F
per Boiler
This is the maximum differential temperature the heat
exchanger can see before the ALARM TYPE is applied. This
value can not be changed and is defined for each boiler size.
LIM-> HALF RATE YES
Limit to Half Rate: When set to YES, and the maximum
differential temperature (delta T) has been exceeded, the fire
rate called for is cut in half. In other words: if we are calling
for 80% modulation and have exceeded the delta T, the
boiler will only fire at 40%. The delta T needs to drop 10F
below the maximum delta T to reset this limit. The message “
½ INPUT” will be displayed on a member boiler and a Master
Boiler will display the Modulation % for the system even
though it is running at ½ of this rate. This method helps
protect the heat exchanger from damage due to excessive
delta T’s. If this Master boiler is running
LOW TEMP HOLD 130
°
F 130 – 160
°
F
The boiler will be held in low fire until the return temperature
exceeds the set value. The default is 130F, but can be
increased to 160F
DOMESTIC HOT WATER
DHW BOILER? NO
Setting this value to YES enables the Boiler/System for DHW
operation. DHW settings are only looked at if set to YES.
DHW SETPOINT
160 ° F 40 – 200 ° F
Setpoint that the boiler/system will target when a call for
DHW.
DHW DIFF
5 ° F 1- 30 ° F
DHW SETPOINT – DHW DIFF : if DHW water temperature is
less than this temperature, the Boiler/System will enter DHW
Heating mode. Once the DHW SETPOINT is reached, DHW
mode is exited.
USE SENSOR? NO
If this entry is set to YES, the DHW 10k Sensor is looked to
for controlling DHW water temperature. If set to NO, A
thermostat is used.
DHW PRIORITY NO
If the DHW PRIORITY is set to YES, then when there is a
call for DHW, the system pump shuts off. If NO, the system
pump stays on.
POST PURGE 120s 0-600 secs
This is the time that the DHW relay remains on after the
DHW call ends.
DHW MASTER? NO
This parameter can only be used if USE SENSOR? is set to
YES, and there is NO Header sensor Present..
If set to YES, this boiler becomes the DHW Master Boiler
and will use HeatNet to control member boilers based on the
DHW Sensor, DHW SETPOINT, and DHW DIFF. If set to
NO, only this boiler will run in DHW mode.
SYSTEM CLOCK
TIME
This time needs to be entered at first turn-on and inthe event
that power has been lost for more than 3 days. The time is
only required for an accurate log entry time-stamp and fault
time stamp.
DAY OF WEEK
MONTH
DAY
YEAR
PRESS SEL TO SAVE
The SEL key must be pressed after all time values have
been entered to save all time values at once.