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6
Water Piping and Trim
D. Special Situation Piping Installation
Requirements
Observe the following guidelines when making the
actual installation of the boiler piping for special
situations:
1. Systems containing high level of dissolved
oxygen – Many hydronic systems contain
enough dissolved oxygen to cause severe
corrosion damage to Apex boiler heat
exchanger. Some examples include but not
limited to:
• Radiant systems employing tubing without
oxygen barrier
• Systems with routine additions of fresh
water
• Systems open to atmosphere
If the boiler is used in such a system, it
must be separated from oxygenated water
being heated with a heat exchanger as
shown in Figures 6-12 and 6-13. Consult
the heat exchanger manufacturer for proper
heat exchanger sizing as well as flow and
temperature requirements. All components on
the oxygenated side of the heat exchanger,
Figure 6-12: Isolation of the Boiler From Oxygenated Water with A Plate Heat Exchanger
106308-05 - 3/23
(continued)
(IWH Piped as Part of Boiler Piping)
APEX
Installation, Operating, & Service Instructions
such as the pump and expansion tank, must
be designed for use in oxygenated water.
2. Piping with a Chiller - If the boiler is used
in conjunction with a chiller, pipe the boiler
and chiller in parallel. Use isolation valves to
prevent chilled water from entering the boiler.
3. Boiler Piping with Air Handlers - Where the
boiler is connected to air handlers through
which refrigerated air passes, use flow control
valves in the boiler piping or other automatic
means to prevent gravity circulation during the
cooling cycle.
Table 6-11: Multiple Boiler Water Manifold Sizing
Boiler
2
3
Model
Recommended Minimum Common Water
Manifold Size (NPT)
APX425C 2½ in. 3 in. 3 in. 4 in. 5 in. 5 in. 5 in.
APX525C
3 in.
4 in. 4 in. 5 in. 5 in. 6 in. 6 in.
APX625C
3 in.
4 in. 5 in. 5 in. 6 in. 6 in. 6 in.
APX725C
4 in.
4 in. 5 in. 6 in. 6 in. 8 in. 8 in.
APX825C
4 in.
5 in. 5 in. 6 in. 6 in. 8 in. 8 in.
Number of Units
4
5
6
7
8
49
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