HydroTherm HeatNet KN -6 User Information page 46

OPTIONAL FEATURES
30. Scroll down to USE SENSOR? Press the
SELECT key and select YES, then press the
SELECT key again. This will allow the boiler to
control the local tank or DHW loop temperature
using the DHW sensor. The upper and lower
differential temperatures will also be loaded.
31. Press the DOWN arrow again and the menu item:
SHARING?, will be displayed.
Set this item is to OFF or CYLE if the boiler is
currently running in space heating and needs to
be shut down before starting up in DHW.
If SHARING? is set to NO CYCLE a hot swap
will occur. A hot swap is when the boiler is
running in space heating mode and does not need
to be shut down. The DHW pump will be
energized without the boiler stopping. Once the
DHW cycle has completed, the boiler will stop
and wait to be called again for either space
heating or DHW heating. A shutdown always
occurs after a DHW cycle completes.
32. Press the DOWN arrow again and the menu item
LOCAL PUMP OFF: will be displayed.
Set this value to NO. This will leave the local
pump on during a DHW heating cycle
(backwards compatibility). Setting this value to
YES will always keep the local pump off.
Setting this value to YES, will shut the local
pump off during a DHW heating cycle, but will
keep the local pump on for the LOCAL DELAY:
10s time before shutting off. This LOCAL
DELAY: time can be adjusted in the next menu
item by pressing the down arrow again.
33. Press the DOWN arrow again and the menu item
PURGE TO THE: will be displayed.
Set this value to TANK. This will purge the heat
from the boiler into the tank or system loop. This
will be done using the DHW pump after the
DHW heating cycle is complete. Set PURGE TO
THE: TANK.
If the PURGE TO THE: is set to SPACE, once
the DHW cycle has completed, the Master will
shut the DHW pump off within a few seconds.
The SPACE setting is to be used only for mixed
space and DHW heating.
HYB SENSOR = OFF
ADVANCED SETUP:DISTRIBUTED CTRL:
MASTER TYPE select DHW.
NOTE: JPS1 MUST be cut on all boilers
providing DHW.
Method 5B using a Thermostat & Sensor.
Method 5(B) can also be used in a hybrid mode on
Member boilers with a thermostat connected to the OR
OVR input. This will enable DHW heating, and be used
instead of having the 10k sensor's temperature detect
when DHW heating is needed, but will use a selectable
sensor instead to maintain setpoint.
Main Heating Loop
LOCAL
Thermistor Sensor
MASTER
DHW
Simplified Drawing
When the OR OVR input sees the thermostat close, the
DHW pump/valve will be engaged and remain energized
as long as the OR OVR input sees that the thermostat is
closed. The DHW setpoint along with the DHW heating
band will then be loaded. A steady temperature will now
be maintained using the HYB SENSOR setting in the
DHW menu. This sensor will control the water
temperature at the sensor's location, enabling or disabling
the boiler as needed until the OR OVR input sees the
thermostat open. Once the thermostat opens, the DHW
pump post purge will begin.
The difference between setting up the 5A method vs 5B
method is the ―USE SENSOR?" setting. 5A requires that
the ―USE SENSOR?" setting be set to YES, and the 5B
"USE SENSOR?" setting be set to NO. The HYB
SENSOR setting must also be set in the 5B mode to the
sensor where temperature needs to be maintained. It must
be set to OFF in the 5A mode.
Method 5A
USE SENSOR? = YES
HYB SENSOR: OFF
Method 5B
USE SENSOR? = NO
HYB SENSOR: SUPPLY, DHW,
Each sensor selection/location has its advantages.
Selecting the:
HeatNet Control V3 2.x
LOCAL
Thermostat
MEMBER
DHW
DHW TANK
= Hybrid mode sensor locations.
RETURN
DHW TANK
(Selectible)
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