Instruction manual

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P/N HN-IOM-1 82-0331 Copyright 2009 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Control manual
Menu item Under . . . Explanation
POST PURGE
DOMESTIC HOT WATER
This is the time that the DHW relay remains on after the DHW call ends.
DHW MASTER?
DOMESTIC HOT WATER
If set to YES, this boiler becomes the MASTER boiler and will use HeatNet to control MEMBER
boilers without the use of a header sensor.
If set to NO, only this boiler will run in DHW mode. This setting is only for stand-alone boilers,
NOT for a boiler in a HeatNet network.
SYSTEM CLOCK
Set the system clock (time, day of week, month, day and year) on start-up and after any
power outage to ensure the data log time stamp information will be accurate.
On HeatNet multiple boiler systems, you only have to set the MASTER boiler clock. The
MASTER boiler will automatically update all MEMBER boiler clocks.
CONTROL
ADVANCED SETUP
DISTRIBUTED CTRL
This is not adjustable. It only displays that the control is a HeatNet (H-Net) control.
H-NET Master
ADVANCED SETUP
DISTRIBUTED CTRL
This is not adjustable. It will automatically say YES for the Master boiler and NO for a MEMBER
boiler. (The Master boiler is the boiler with a sensor connected to the SYS/DHW HEADER
terminals.)
H-NET ADDRESS
ADVANCED SETUP
DISTRIBUTED CTRL
Assign each MEMBER boiler a unique address, any value from 2 through 16.
The Master boiler H-NET address is automatically set to 255. (The master boiler is
automatically recognized because it is the one with a sensor wired to its SYS/DHW HEADER
terminals.)
MODBUS ADDRESS
ADVANCED SETUP
DISTRIBUTED CTRL
This is used only when the boilers are regulated by a building management system, using
MODBUS, BACNET or LonWorks. Assign each member boiler AND the HEATNET master boiler
a unique address, any value from 1 to 247.
ADD BOILER DELAY
ADVANCED SETUP
MODULAR BOILER
This is the minimum wait time before an additional boiler can fire when called on by the
master boiler control.
MODULATE DELAY TIME
ADVANCED SETUP
MODULAR BOILER
The boiler will remain at minimum fire when first starting until this amount of time has
elapsed.
MOD MAX - LAST FIRE
ADVANCED SETUP
MODULAR BOILER
This sets the maximum firing percentage for boilers during times that some boilers are not
firing. It limits input of the boilers to keep them as efficient as possible. Once all boilers are
started (during high heat demand periods), this restriction is removed, and all boilers can fire
up to maximum input. Once any boiler is dropped offline, the restriction is applied again.
MOD MODE
ADVANCED SETUP
ADAPTIVE MOD
ADAPTIVE — the Master boiler lowers the modulation rate of all currently-operating boilers
before a newly-added boiler enters “main valve” state. After the new boiler main valve starts,
the Master boiler waits the DELAY RELEASE time (see below) before allowing return to normal
modulation.
ORIG KN — the Master boiler allows the HeatNet system to modulate normally as additional
boilers start.
DROP DOWN
ADVANCED SETUP
ADAPTIVE MOD
ON PILOT — the Master boiler (if MOD MODE is set to ADAPTIVE) waits until the newly-added
boiler reaches its PILOT state before lowering the modulation rate of running boilers.
IMMEDIATE — the Master boiler (if MOD MODE is set to ADAPTIVE) drops the modulating rate
of running boilers immediately when an additional boiler is started.
DELAY RELEASE
ADVANCED SETUP
ADAPTIVE MOD
When MOD MODE is set to ADAPTIVE, the Master boiler waits this amount of time before
allowing the system to return to normal modulation. This delay allows time for the newly-
added heat to impact the system.
ROTATION
ADVANCED SETUP
FIRING MODE
Select the rotation method. NOTE: The boiler setup as LEAD BOILER under
[SETUP/BOILERS/LEAD STAGE #] will always start first, regardless of rotation method selected.
For boilers on a common vent system, this allows specifying the boiler closest to the vertical
vent to start first to establish draft in the vent system.
TRUE ROTATION (or TRUE RUNTIME ROTATION) attempts to fire all boilers an equal amount of
time.
FIRST ON FIRST OFF jogs between boilers to balance usage.
LAST ON FIRST OFF maintains the same rotation sequence at all times.
Table 9 Setup menus — parameter explanations (continued)
Control menus and adjustments (continued)Control menus and adjustments (continued)
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