44
NOTICE
The Apex boiler heat exchanger is made from stainless steel tubular coil having relatively narrow
waterways. Once filled with water, it will be subject to the effects of corrosion. Failure to take the
following precautions to minimize corrosion and heat exchanger waterways overheating could result in
severe boiler damage.
•
Before connecting the boiler, insure the system is free of impurities, grease, sediment, construction
dust, sand, copper dust, flux and any residual boiler water additives. Flush the system thoroughly
and repeatedly, if needed, with clear water mixed with concentrated rinse agent to remove these
contaminants completely.
•
Iron oxide (red oxide sludge Fe
2
O
3
) is produced during oxygenation. To minimize any oxygen pres-
ence in the system, the system must be air free and leak tight. Do not connect the boiler to radiant
tubing without an oxygen barrier. Using automatic water refill is not recommended, however, if such
refill is employed, a water meter must be added to evaluate the makeup water volume taken after ini
-
tial fill and eliminate any water leakage as early as possible.
•
Maintain the water pressure in the boiler at a minimum of 20 psi (140 kPa).
•
The boiler water pH must be within 7.5 < pH < 9.5. If the system contains any aluminum components,
pH must be less than 8.5.
•
Black oxide sludge (magnetite Fe
3
O
4
) forms as the result of continuous electrolytic corrosion in any
system not protected by an inhibitor.
•
Scale deposit is made up of lime scale contained in most distributed water and settles over the warm-
est surfaces of boiler heat exchanger causing subsequent overheating and eventual failure. Water
hardness must be maintained within 3 to 9 grain/gal range.
•
Refer to Section XI “Service and Maintenance” for recommended heating system water treatment products
(corrosion/scale inhibitors, cleaners etc) and their suppliers.
VI. Water Piping and Trim
C. Standard Installation Requirements (continued)
10. Isolation Valves (Strongly Recommended)
–
Isolation valves are useful when the boiler must be
drained, as they will eliminate having to drain and
refill the entire system.
11. Drain Valve (Required)
– Drain valve is
packaged loose with boiler and must be installed
in the location shown in Figure 19A, 19B or 19C
“Factory Supplied Piping and Trim Installation”.
Summary of Contents for APEX
Page 57: ...57 VIII Electrical continued Figure 26 Ladder Diagram ...
Page 58: ...58 VIII Electrical continued ...
Page 59: ...59 Figure 27 Wiring Connections Diagram VIII Electrical continued ...
Page 105: ...105 ...
Page 109: ...109 XIII Repair Parts continued APX625 APX725 and APX825 APX825 shown ...
Page 112: ...112 XIII Repair Parts continued APX425 and APX525 ...
Page 114: ...114 XIII Repair Parts continued APX625 APX725 and APX825 ...
Page 122: ...122 ...
Page 123: ...123 ...
