IBC Technologies Inc.
22
VFC 15-150 and VFC 45-225
2 Boiler Systems and Operation
2.1 GENERAL
VFC modulating series boilers are
designed to service three separate,
directly piped heating loads using
different pre-selected water
temperatures and heat regulation
routines. External controls can extend
applications.
The control is outfitted to provide for
outdoor reset, set point regulation and
DHW. The design objective is DHW
plus radiant floor and baseboard space
heating, each operable at a unique
temperature.
The three load "channels" actual stand
available on delivery as generic
platforms, which can be programmed
for set-point control or with outdoor
reset parameters. See Section 2.7 –
Set
Up and Load Definition
. The strategy is
to deliver high temperature water, as
required by most indirect DHW tanks
on the market, and by finned tube
baseboards, but default to the lowest
possible boiler supply temperature to
maximize efficiency. The VFC
modulating series boilers can handle
supply temperatures within the range
60°F to 180°F.
2.2
CONTROL
The control unit provides overall
management of boiler operations,
including:
1.
power-up / set-up / boiler state
machine (standby / heat call
management etc)
2.
burner, pumps (p external)
and/or zone valve management
3.
temperature and throttle operation
4.
maintenance of a service log with
diagnostics
5.
2 way communications
Operating and historical data may be
accessed at any time, using the Log and
Advanced Settings fields, available
using the permanently lit LCD screen –
see below. Data includes the following:
•
Ignition counter
•
Time records, including burn time
by load and the throttle duty cycle
•
Error log
2.3 USER
INTERFACE
2.3.1 Keypad Functions
A five button keypad is provided for
intuitive navigation around the screen.
The four outer keys are used to move
the cursor up or down, and side to side.
The centre button is used to make
selections and confirm inputs. The left
hand key is also used to back-step to the
previous screen; multiple key stokes are
used to withdraw back to the operating
status screen. Alternatively, after an
interval of 2 minutes without use, the
display will default back to the
operating status window.
2.3.2 LCD Display
Upon power-up, the LCD screen
initially flashes a software release
number then switches to a
Standby
-
display mode, showing real time data
plus key temperature target settings.
