DHW METHODS
HeatNet Control V3
Page 45
This method is for controlling DHW utilizing a tank
thermostat connected to a MASTER boiler. This method
requires a thermostat input to the OR OVR. When the
thermostat contact closes across the input
OR OVR (J12A
.7 & .8),
the control
will sense this closure and override the
space heating setpoint with the DHW setpoint.
SETTINGS:
DISTRIBUTED CONTROL: MASTER TYPE:
COMBINATION.
This method is for backwards compatibility.
In this mode, the boiler will fire to the
DHW
setpoint.
The settings for space heating will be used except for
the addition of controlling the DHW pump by the
MASTER boiler.
1.
Wire the dry contact from the thermostat on the
tank to the input on J12A terminal 7 & 8 (
OR
OVR)
. Also, at this time wire any pump or valve
from the DHW Pump relay (normally open)
contact (J13 terminals 16, 17, & 18) of the
MASTER to control flow of the heating water
into the tank’s coil.
2.
Enter the
DOMESTIC HOT WATER MENU
.
Go to
BOILER MODE
and enter
AUTO
.
3.
DHW SETPOINT
The setpoint should reflect the
temperature desired in the heating loop when a tank is
calling for DHW heat.
4.
LOWER BAND
This is not used.
5.
UPPER BAND
This is not used.
6.
PUMP PRIORITY
Setting this value to
YES
will turn
OFF the system pump when the DHW setpoint override
mode is active. Setting this value to
NO
leaves the
system pump on. This active period includes the post
purge of the DHW/valve pump.
7.
Select the menu item
POST PURGE.
This is the time
that the DHW pump relay remains energized after the
DHW thermostat has been satisfied. Once the tank has
opened its thermostat, the system/local setpoint will be
reloaded and the post purge time will begin.
8.
Select the menu item:
LOCAL PUMP OFF:
When a
DHW heating cycle begins, what to do with the local
pump/valve is determined:
NO
The local pump/valve will remain running during
DHW heating.
YES
The local pump/valve will shut off with a delay
determined by
LOCAL DELAY: seconds.
This
allows the DHW pump/valve to prove before
shutting off the local pump.
Piping of the system will determine which setting to
use.
9.
Select the menu item:
PURGE TO.
After a DHW cycle
completes, the pump/valve can be selected to either
purge to the
TANK
, or to the
SPACE
for the duration
of the post purge time. This selection can use the space
to dump the heat from the boiler and not overheat the
DHW tank/load.
10.
Set the
HYB SENSOR = OFF
. This sensor is
selectable for Method 5A only.
Follow the same steps as used to program DHW
Heating using a Header Sensor INPUT.
USE
SENSOR,
select
NO
.
JPS1 MUST be cut on all boilers
providing DHW.
Summary of Contents for FUTERA XLF Series
Page 27: ...CONTROL METHODS HeatNet Control V3 Page 27 Figure 25 Base loading relay...
Page 67: ...WIRING CONNECTIONS HeatNet Control V3 Page 67 Figure 49 Jumper Dip Switch Locations...
Page 73: ...WIRING CONNECTIONS HeatNet Control V3 Page 73 Figure 57 Temperature sensors...
