Install Instructions

62 103448-08- 9/16
VI. Water Piping and Trim D. Special Situation Installation Requirements (continued)
2. Piping with a refrigeration system - If the
boiler is used in conjunction with a refrigeration
system, pipe the boiler and refrigeration system in
parallel. Use isolation valves to prevent chilled
medium from entering the boiler.
3. Boiler Piping with Air Handlers - Boiler
connected to heating coils located in air handling
units with potential exposure to refrigerated air
circulation must be equipped with ow control
valves or other automatic means to prevent gravity
circulation of boiler water during the cooling cycle.
Table 15: Multiple Boiler Water Manifold Sizing
Boiler Model
Number of Boilers
2 3 4 5 6 7 8
Recommended Minimum Common Water
Manifold Size (NPT)
ALP080B 1¼” 1½” 1½” 2” 2” 2” 2½”
ALP105B 1¼” 1½” 2” 2” 2½” 2½” 2½”
ALP150B 1½” 2” 2½” 3” 3” 3” 3”
ALP210B 2” 2½” 2½” 3” 3½” 3½” 3½”
ALP285B 2” 3” 3” 3½” 4” 4” 5”
D. Special Situation 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 Alpine 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 Figure 23. Consult
the heat exchanger manufacturer for proper heat
exchanger sizing as well as ow and temperature
requirements. All components on the oxygenated
side of the heat exchanger, such as the pump
and expansion tank, must be designed for use in
oxygenated water.
Figure 23: Isolation of the Boiler From Oxygenated Water with A Plate Heat Exchanger