Alpine Installation, Operating, and Service Instructions

62
103448-10- 6/18
VI. Water Piping and Trim (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 flow 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 flow 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