Hot Water Coils - Lennox FLEXY II Series Installation, Operating And Maintenance

HEATING : HOT WATER COIL
HYDRAULIC CONNECTIONS
Hot water coils offer f ully modulating control through the
use of a 3 way v alv e. The hot water coil, connections and
v alves are all tested at pressure of 15 bars. Frost
protection is prov ided by f orcing the opening the 3 way
v alve when supply temperature f rom hot water coil f alls
below 8°C and by stopping the outdoor fan when that
supply temperature f alls below 6°C. In addition to that, the
3 way s is also opened at 10% v alue if the outdoor
temperature f alls below an adjustable value.
Hot water coils are alway s f actory f itted, wired and f ully
tested, prior to shipment.
Hot water coil includes automatic purge system.
The hot water coil is f itted with a three way proportional
v alve and two isolating shut off valv es. Two spanners must
be used to tighten the connections. One spanner must
maintain the v alve body when connecting the pipe-work to
the main. Failure to do so may damage the pipes joints
and inv alidates the warranty.
Filling up and starting the system
- Adjust the control for Heating by reducing the
simulated ambient temperature down to 10°C
- Check that the red indicators located under the valv e
actuator are mov ing correctly with the signal.
- Fill the hy draulic system and bleed the coil using the
air v ents. Check incoming hot water.
- Check the various connections for possible leaks
IOM – FLEXY II – 1007 – E
FREEZE PROTECTION
1) Gly col f or f reeze protection.
Check the hy draulic system contains Glycol f or protection
against freezing.
GLY COL IS THE ONLY EFFECTIVE PROTECTION
AGAINST FREEZING
The antif reeze must protect the unit and avoid icing under
winter conditions.
WARNING: Mono-ethy lene glycol based f luids may
produce corrosiv e agents when mixed with air.
2) Drain the installation.
Y ou must ensure that the manual or automatic air bleeders
hav e been installed on all high points in the system. In
order to drain the system, check that all the drain cocks
hav e been installed on all low points of the system.
HOT WATER COILS FROZEN DUE TO LOW AMBIENT
CONDITIONS ARE NOT COVERED BY THE
WARRANTY .
ELECTROLY TIC CORROSION
Attention is drawn to the corrosion problems resulting from
electrolytic reaction created by unbalanced earth
connections.
ANY COIL DAMMAGED BY ELECTROLY TIC
CORROSION IS NOT COVERED BY THE WARRANTY
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