6
CHAPTER
2
CHAPTER 2 - INSTALLATION - PIPING
2.12. Boiler Piping
• If plastic pipe is used for boiler water piping, it must
have a maximum oxygen diffusion rate of 0.1 mg/
liter-day for boiler and water heater protection.
The SMART IDWH must be installed on a closed
type hydronic system. Failure to provide such
a system will result in premature failure of the
tank and annulment of warranty.
• Boiler water (including additives) must be practical-
ly non-toxic, having toxicity rating or class of 1, as
listed in
Clinical Toxicology of Commercial Prod-
ucts
.
Antifreeze can only be used if the boiler water
pressure relief valve is set to 30 psig or below.
NOTICE
CAUTION
• If antifreeze is used in the boiler system, local codes
may require a backflow preventer on cold water
supply line. Use antifreeze specifically intended for
hydronic heating systems. Inhibited propylene gly-
col is recommended at a maximum 50/50 mixture.
Do not use automotive, ethylene glycol or
petroleum-based antifreeze. Do not use any
undiluted antifreeze. This can cause substan-
tial property damage, serious injury, or death.
DANGER
Summary of Contents for SMART Series
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