ATH KN-10, Control Manual

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OPTIONAL FEATURES HeatNet Control V3 2.x
B. Pump on the Master boiler functions as a global
pump.
8. Now, is the system to use a DHW sensor? USE
SENSOR in this example should be set to YES. This
will allow the boiler to control the tank or DHW loop
temperature using the DHW sensor. The upper and
lower differential temperatures will also be loaded.
9. The SHARING item is set to OFF, only boilers that
are not firing will be checked for runtimes and fired.
10. Set the LOCAL PUMP OFF 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.
The Master‟s DHW relay will remain on as long as
there are boiler‟s firing and the DHW temperature is
below the (DHW SE UPPER BAND).
Once all boilers are off and the DHW temp is equal
to or above the (DHW SE UPPER
BAND), the DHW pump will begin its post-purge
time. If during this post-purge time the DHW temp
falls below the (DHW SE UPPER
BAND), the DHW pump will remain on.
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.
11. Press the DOWN arrow again and the menu item :
will be displayed.
Set the PURGE TO 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.
If the PURGE TO : 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
should only be used only for combination space and
DHW heating.
12. Set the HYB SENSOR = OFF . This sensor is
selectable for Method 5A only.
Now in the,
SETTINGS: DISTRIBUTED CONTROL:
MASTER TYPE select DHW .
NOTE: JPS1 MUST be cut on all boilers providing
DHW.
DHW METHOD 2: Combination DHW
and Space Heating using a MASTER
Boiler and Member boiler(s)
(Master Type: MIXED(Combination))
This Method works much the same as DHW METHOD 1,
but also has the ability to provide space heating. The Master
boiler will use two PID controls to simultaneously maintain
the DHW and space heating setpoints. This method is
determined by
SETTINGS: DISTRIBUTED CONTROL:
MASTER TYPE: MIXED (Combination).
This method utilizes a 10k thermistor connected to the
DHW Sensor input and the HEADER sensor input of a
MASTER boiler. Setting up the DHW portion of this
method is done via the menus in:
SETTINGS:
DOMESTIC HOT WATER. For information on setting
up the space heating portion of this method, Refer to Heat
Demand Control Method 1 located in the CONTROL
METHODS section.
DHW TANK 2
MEMBER
Main Heating Loop
MASTER
DHW TANK 1
Master Header
Sensor
Master DHW
Sensor
Parallel Stat
Inputs from tanks
using RIB relays.
DHW
DHW
LOCAL
LOCAL
HS
HS
HS = Hydraulic separator
RIB
OR OVR
DHW Heating Loop
Example: Combination DHW/Space Heating
Simplified Drawing
When this method is used (due to use of the DHW sensor),
the OR OVR input functions as an enable/disable. This
allows the DHW heating function to be enabled or disabled
much in the same way as the Heat Demand input for space
heating.
The DHW pump is individually controlled on each boiler
that fires in DHW. The Master does not use its pump
globally when any DHW boiler is called. The Master only
engages its DHW pump if it was called to perform DHW
heating.
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