Lennox SCA 010 Installation, Operation & Maintenance Manual page 41

HO HO HOT W HO HO T W T W T WA A A A A TER BA T W TER BA TER BA TER BATTERY TER BA
HYDRAULIC CONNECTIONS
When a hot water heating coil is installated (option), the
heating coil pipe connections should be connected to
isolating valves provided by others, on system side of the
unit.
However, 3-way control valve is provided and hard wired to
unit controllers supplied with the unit.
Proceed as follows:
- Open the stop valves and set the 3-way valve to the
intermediate position (manual position and turn the
thumbwheel to a mid position).
- Fill the hydraulic system and bleed the battery using the
air vent.
- Check the connections for possible leaks.
- Reset the 3-way valve to automatic.
PROTECTION AGAINST FREEZING
1) Use glycol water
GLYCOL IS THE ONLY
EFFECTIVE PROTECTION AGAINST FREEZING
The antifreeze must protect the unit and avoid icing under
winter conditions.
Warning : monoethylene glycol-based antifreeze may
produce corrosive agents when mixed with air.
If possible, use glycol with corrosion inhibitor.
2) Drain the installation
You must ensure that the manual or automatic air vents have
been installed on all high points in the system. In order to
drain the system check that all the drain cocks have been
installed on all low points of the system.
To drain, ensure isolating valves are closed, open drain
cocks and airvents to drain off water.
A HEATING COIL FROZEN DUE TO LOW AMBIENT
CONDITIONS IS NOT COVERED BY THE WARRANTY.
ELECTROLYTIC CORROSION
Attention is drawn to the corrosion problems resulting from
electrolytic reaction created from unbalanced earth
connections.
ANY COIL DAMAGED BY ELECTROLYTIC REACTION
IS NOT COVERED BY THE WARRANTY.
Page 40 - IOM / Rooftop Smart and Linéa™ Range
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