Freeze Protection; Boiler Treatment - IBC VFC 15-150 Manual

WARNING
For service replacement of the
fan on the VFC 45-225 boiler,
use the NRG-137; DO NOT
ATTEMPT TO PLACE A RG-
148 FAN (as used on previous
versions of the VFC 45-225
boiler) ON A BOILER HAVING
A CONDENSATE TRAP DEPTH
OF LESS THAN 28" – an RG
148 fan can blow a clear a
shorter trap, allowing noxious
fumes to enter living space.
WARNING
Do not use automotive-type
ethylene or other types of
automotive glycol antifreeze,
or undiluted antifreeze of
any kind. This may result in
severe boiler damage. It is the
responsibility of the Installer to
ensure that glycol solutions are
formulated to inhibit corrosion
in hydronic heating systems
of mixed materials. Improper
mixtures and chemical
additives may cause damage
to ferrous and non-ferrous
components as well as non-
metallic, wetted components,
normally found in hydronic
systems. Ethylene glycol is
toxic, and may be prohibited
for use by codes applicable
to your installation location.
For environmental and toxicity
reasons, IBC recommends
only using non-toxic propylene
glycol.
CAUTION
Installers should inquire of
local water purveyors as to
the suitability of their supply
for use in hydronic heating
systems. If water quality is
questionable, a local water
treatment expert must
be consulted for testing,
assessment and, if required,
treatment. Alternatively, water
or hydronic fluid of known
quality can be brought to the
site.
MAINTENANCE
VFC 15-150 - VFC 45-225 MODULATING GAS BOILERS
•
the second screen (below) shows another boiler (a 45-225) has operated for
26% of the total load 2 on-time at the bottom 30% of the throttle range and
virtually no time below that.
interpretation of this type of operation must be done carefully, by observing
the system as it runs. this could either be a classic case of over-sizing to a
load that cannot sink heat fast enough, resulting in short cycling - or - it may
be normal and healthy operation for some loads, such as air handlers or heat
exchangers that can always sink heat above the lower firing rates.
4.1.10 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.

4.1.11 Freeze Protection

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.

4.1.12 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.
4.1.13 Relief Valve - Maintenance and Testing
the relief valve manufacturer requires that under normal operating conditions
a "try lever test" must be performed every two months. under severe service
conditions, or if corrosion and/or deposits are noticed within the valve body,
testing must be performed more often. a "try lever test" must also be performed
at the end of any non-service period.
test at or near maximum operating pressure by holding the test lever fully open
for at least 5 seconds to flush the valve seat free of sediment and debris. Then
release the lever and permit the valve to snap shut.
CAUTION
Before testing the relief valve,
make certain the discharge
pipe is properly connected to
the valve outlet and arranged to
contain and safely dispose of
equipment discharge.
4-3