IBC Technologies Inc.
39
VFC 15-150 and VFC 45-225
Pump
Check that the pump is on in normal
operation and that the water
∆
°T is
reasonable for a given firing rate - e.g. 10°F
between supply and return when firing at
75,000 Btu/hr. for a VFC 15-150 unit.
Gas Piping
Check for damage or leaks and repair as
needed.
Control Module
Check that boiler operation is consistent
with the steps in
section 2.5 - Sequence of
Operation
.
Check that water temperature targets and
setpoint is satisfactory and have not been
adversely amended.
Check the operating history using the
screen: - use
Installer Setup // Logs
, to scan
for hours of service, cycles per hour, and
any logged errors. One method is to use the
graphical presentation of the duty cycle by
load – go to
Logs
, move the cursor to a load
and push “Enter” to access. This gives a
profile of the boiler’s duty cycle by throttle
level – see below.
The screen shows that this boiler (a 15-150)
has operated for 44% of total Load 1 on-
time at the bottom 10% of the throttle range
– e.g. between 15,000 to 27,500 Btu/hr.
Where a load is heavily weighted to the
lowest firing rate and the cycles/day count
is in excess of 96/day, there may be
insufficient loading of the boiler. Consider
increasing the temperature target for such
load and/or the respective Minimum
Temperature setting.
If a problem exists with the control, consult
troubleshooting guide.
Water
Check water pressure and temperature.
There should be no noticeable change if
boiler is functioning normally. Check for
any noise in the system.
Check water piping for damage or leaks and
repair as needed.
Freeze Protection
Do not use Ethylene Glycol, automotive-
type antifreeze, or undiluted antifreeze.
This may result in severe boiler damage
Check freeze protection. Use only
antifreeze made specifically for hydronic
systems. Inhibited propylene glycol is
recommended. Antifreeze volume must not
exceed 50% of the total volume of water in
the system.
Boiler Treatment
Check consistency of any boiler treatment
used, e.g.. Furnox™, for appropriate
mixture. Chemical inhibitors are consumed
over time, lowering their density.
Verify proper operation after servicing.
