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PART 5. PIPING
1) Attach hose to balance and purge
hose connector and run to drain.
2) Close the other side of the balance
and purge valve.
3) Open first zone balance and
purge valve, so as to let the water
flow out of the hose. If zone
valves are used, open zone valves
one at a time, manually. (NOTE:
please check manufacturer’s
instructions prior to opening
valves manually, so as not to
damage the valve.)
4) Manually operate fill valve
regulator. When water runs out
of hose, connected to the balance
and purge valve, in steady
stream (with no air bubbles),
close balance and purge valve
to stop the water from flowing.
Disconnect hose and connect to
next zone to be purged.
5) Repeat procedure for additional
zones (one at a time).
Upon completion, make sure that the
fill valve is in automatic position and
each zone balance and purge valve
is in the open position and zone
valves are positioned for automatic
operation.
NOTE:
Installations that incorporate
Standing Iron Radiators and systems
with manual high point vents:
Follow the above procedure, then
starting with nearest manual air
vent, open vent until water flows
out; close vent. Repeat procedure,
working your way toward furthest
air vent. It may be necessary to
install a basket strainer or filtration
in an older hydronic system where
larger amounts of sediment may
be present. Periodic cleaning of the
strainer may be necessary.
For boiler water and/or odd water
systems, please make note of these
additional guidelines:
• Thoroughly flush the system
(without boiler connected) to
remove sediment. The high-
efficiency heat exchanger can
be damaged by build-up or
corrosion due to sediment.
• Do not use petroleum-based
cleaning or sealing compounds
in the boiler system. Gaskets
and seals in the system may
be damaged. This can result in
substantial property damage.
• Do not use ‘homemade cures’ or
‘boiler patent medicines’. Serious
damage to the boiler, personnel,
and/or property may result.
• Continual fresh make-up water
will reduce boiler life. Mineral
buildup in the heat exchanger
reduces heat transfer,
overheats the stainless steel
heat exchanger, and causes
failure. Addition of oxygen
carried in by makeup water
can cause internal corrosion
in system components. Leaks
in boiler or piping must be
repaired at once to prevent
makeup water.
C. FILL & PURGE HEATING SYSTEM
D. REMOVING AIR FROM THE HEAT EXCHANGER
The EVO 299–599 has an automatic air vent on the top of the appliance and the air vent cap must be loosened to
allow trapped air to escape when the appliance is initially filled and put into operation. If this air vent should start to
leak, there are two possible solutions:
a. Close the cap—the air vent is not needed anymore after the heat exchanger has been purged of air. This air vent
MUST be operable if the appliance is drained and refilled.
b Replace the air vent. When replacing the air vent, the water must be shut off and pressure released first.
