HTP 399M - Manual (Page 59)

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2. Freeze protection fluid must be replaced periodically due to degradation of inhibitors over time. Follow all fluid manufacturer
instructions.
NOTE: Boiler failure due to improper water chemistry is not covered by warranty.
B. FREEZE PROTECTION (WHEN USED)
NEVER use automotive or standard glycol antifreeze, or ethylene glycol made for hydronic systems. System water, including additives,
must be non-toxic, having a toxicity rating or Class of 1, as listed in Clinical Toxicology of Commercial Products. Use only freeze-
prevention fluids certified by fluid manufacturer as suitable for use with stainless steel boilers, verified in fluid manufacturer literature.
Thoroughly clean and flush any system that has used glycol before installing the new boiler. Provide boiler owner with a material safety
data sheet (MSDS) on the fluid used.
1.
Determine freeze protection fluid quantity using total system water content, following fluid manufacturer’s instructions. Remember to
include expansion tank water content.
2. NOTE: Local codes may require back flow preventer or actual disconnect from city water supply.
3. When using freeze protection fluid with automatic fill, install a water meter to monitor water makeup. Freeze protection fluid may leak
before the water begins to leak, causing concentration to drop, reducing the freeze protection level.
C. FILL AND TEST WATER SYSTEM
Ensure the boiler is full of water before firing the burner. Failure to do so will damage the boiler. Such damage IS NOT covered by
warranty, and could result in property damage, severe personal injury, or death.
1. Fill system only after ensuring the water meets the requirements of this manual.
2. Close manual and automatic air vents and boiler drain valve.
3. Fill to correct system pressure. Correct pressure will vary with each application.
a. Typical cold water fill pressure for a residential system is 12 psi.
b. Pressure will rise when boiler is turned on and system water temperature increases. Operating pressure must never exceed
25 psig.
4. At initial fill and during boiler startup and testing, check system thoroughly for any leaks. Repair all leaks before proceeding further.
Eliminate all system leaks. Continual fresh make-up water will reduce boiler life. Minerals can build up in the heat exchanger, reducing
heat transfer, overheating heat exchanger, causing heat exchanger failure, and possibly resulting in property damage, severe personal
injury, or death.
5. The system may have residual substances that could affect water chemistry. After the system has been filled and leak tested, verify
water pH and chlorine concentrations are acceptable.
D. PURGE AIR FROM WATER SYSTEM
It is important that you purge the system of air to avoid damage to the boiler. Make sure that this procedure is followed before firing the
boiler.
To purge air from system:
a. Connect a hose to the purge valve and route hose to an area where water can drain and be seen.
b. Close the boiler or system isolation valve between the purge valve and fill connection to the system.
c. Close zone isolation valves.
d. Open quick-fill valve on cold water makeup line.
e. Open purge valve.