All water supplies contain some solids, dissolved gases or dissolved minerals. These may encourage
corrosion, deposition and/or fouling of equipment. To prevent these contaminants from impacting boiler
performance, valve operation and general pipe longevity, each location must be analysed and treated
accordingly.
Adhere to the following for water piping installation.
1. The boiler requires a minimum temperature differential across the heat exchanger at high re,
and has a minimum ow requirement.
2. Ensure piping arrangements allow for heat-up times at or below 30 seconds; this will reduce
condensation which may contribute to equipment failure.
3. Pipe unions and isolation valves are recommended on both water connections for ease of
service.
4. Install piping so that the boiler is not supporting any additional piping.
5. The top water connection on the back of the boiler is the hot water inlet and must be connected
as the return from the system. The bottom connection is the ow/boiler outlet.
6. Install a hot water circulator, remote mounted from the boiler. Do not attach directly to the boiler.
7. If the boilers are connected to heating coils, located in air handling units where they may be
exposed to refrigerated air circulation, such boiler piping system shall be equipped with ow
control valves or other automatic means to prevent gravity circulation of the boiler water during
the cooling cycle.
8. The boiler is not provided with a drain valve directly on the boiler. A drain valve should be
installed near the system return (water inlet) connection to the boiler and piped to a drain.
9. Before installing a FHE-250 boiler into a hydronic loop, be sure that the system piping and
any other components of the system are clean and free of debris and any foreign matter. The
hydronic system should be completely ushed prior to installing the boiler itself. Install a strainer
upstream of each boiler to ensure that no foreign matter will have the opportunity to get inside
the heat exchanger.
WARNING
The boiler must be disconnected at the boiler shut off valve from the
gas supply piping system during any pressure testing of the system.
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