DHW METHODS
HeatNet Control V3
Page 48
This method is for controlling DHW utilizing a 10k sensor
in the tank connected to
DHW TANK
(J10A, 9 & 10)
of a
MASTER boiler. This method is only available on the
MASTER boiler since its purpose is to override the setpoint.
This method requires a jumper input to the
OR OVR (J12A
7 & 8),
which acts like an enable. The control
will sense this
closure and override the space heating setpoint with the
DHW setpoint when the DHW tank temperature drops
below the lower band of the DHW setpoint. All boilers are
started and stopped using the space heating “Modular
Boiler” settings.
SETTINGS: DISTRIBUTED
CONTROL: MASTER TYPE:
COMBINATION.
In this mode, the boiler will fire to the
DHW
setpoint.
The settings for space heating will be used except for
the addition of the
MASTER Boiler
controlling the
DHW pump/valve.
1.
Wire the 10K Tank sensor to the MASTER on
DHW TANK
(J10A, 9 & 10).
Jumper the input
on
J12A terminal 7 & 8 (OR OVR)
. Also, at
this time wire any pump or valve from the DHW
Pump relay contact
(J13 terminals 16, 17, & 18)
N/C, C, & N/O respectfully
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 pump/valve.
7.
Select the menu item
POST PURGE.
This is the time
that the DHW pump relay remains energized after the
DHW demand has been satisfied. Once the tank has
reached temperature, 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 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
Yes
.
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...
