50
LP- 428 REV. 9.2.14
B. FREEZE PROTECTION (WHEN USED)
NEVER use automotive or standard glycol antifreeze, or ethylene glycol made for hydronic systems. Use only freeze-protection fluids
certified by fluid manufacturer as suitable for use with stainless steel boilers, verified in fluid manufacturer’s 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. Local codes may require back flow preventer or actual disconnect from the 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
1. Fill system only after ensuring the water meets the requirements of this manual.
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.
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
160psig.
4. At initial fill and during boiler startup and testing, check system thoroughly for any leaks. Repair all leaks before proceeding.
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, and causing heat exchanger failure. Such failure IS NOT covered by warranty.
5. The system may have residual substances that could affect water chemistry. After the system has been filled and leak tested, verify
that water pH and chlorine concentrations are acceptable by sample testing.
It is important to purge the system of air to avoid damage to the boiler.
D. PURGE AIR FROM WATER SYSTEM
IMPORTANT! While commissioning the system, the air vent on top of the boiler must remain fully open to allow the boiler to properly
fill. Failure to keep the air vent open could lead to improper boiler and system operation.
To purge air from the 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 make-up line.
e. Open purge valve.
f. Open the isolation valves one zone at a time. Allow water to run through the zone, pushing out the air. Run water until no
noticeable air flow is present. Close the zone isolation valves and proceed with the next zone. Follow this procedure until all
zones are purged.
g. Close the quick-fill water valve and purge valve and remove the hose. Open all isolation valves. Watch the system pressure
rise to correct cold-fill pressure. It is recommended that you put the pumps into manual operation to assist in purging the
circuits.
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