DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS
HeatNet Control REV 1.38-1
Page 50
Default Settings & Menu Item Descriptions — ADVANCED SETUP
DISTRIBUTED CTRL
CONTROL
H-Net
Displays method of operation: HeatNet (H-Net)
H-Net MASTER
YES
Auto detected, based on the HEADER sensor.
If the HEADER sensor is present and is set to TYPEZ, the
Smith-Series control is run as a H-Net MASTER (YES).
If the HEADER sensor is not TYPEZ, H-Net MASTER = NO.
H-NET ADDRESS
255
(2 –16)
The local address is the address of a member device. This is no
MODBUS ADDRESS
1
(1 – 247)
The MODBUS address is for communicating with Laptop,
PC, or other MODBUS capable device. It is the 2nd
communication port reserved for host control.
MODULAR BOILER SET
ADD BOILER DELAY
10mins
(0 – 15min)
This is the delay time in 30sec intervals, before starting a
new boiler. Boiler #1 is started immediately after a call for
heat. If a second boiler needs to start, the ADD BOILER
DELAY will need to expire before starting.
SHED BOILER DELAY
2mins
(0-15min)
This is the delay time in 30 second intervals, before stopping
a boiler. A boiler is stopped immediately when the top of the
heat band is exceeded. If a second boiler needs to stop, the
SHEDBOILER DELAY will need to expire before stopping.
MODULATE DELAY
TIME
10 secs
(0 – 60min)
This is the time the boiler remains in min-fire before it
relinquishes control to the modulation % signal.
MOD MAX – LAST
FIRE
70%
(25 – 100%)
This value represents the maximum % of input on the boilers
if all the available boilers are not firing. Once all boilers are
firing, this clamp is removed and all boilers are allowed to
modulate up to 100%. When this value is limiting the input an
‘*’ is displayed and the “INPUT CLAMP” message is
displayed in the STATUS screen. This value is derived by:
multiplying twice the minimum fire rate of the boiler with the
least turndown (2* turndown(20% 5:1, 25% 4:1, 33% 3:1)). In
mixed boiler size configurations, more than (2) boilers in a
system, or when “bumps” in the temperature occur as boilers
are added and subtracted, this value may need adjustment.
The adjustments will help produce smooth temperature
control when each boiler is started and stopped. This method
ensures that, once a new boiler starts to fire, and holds its
fire rate at the minimum setting, it does not add its BTU
output to a boiler already firing at 100%. The boilers can not
be fired starting @ 0%, but start at a minimum (example:
20%) and introduce a minimum amount of BTUs into the
system. Section: SETUP & OPERATION
