Figure 3: Recommended Water Piping for
Zone Valve Zoned Heating Systems
WARNING
Safety relief valve discharge piping must be piped near floor to eliminate potential of severe burns. Do not pipe in any area where freezing could occur. Do not install any shut-off valves.
D.Install circulator with flanges, gaskets and bolts provided. Five foot long circulator harness allows circulator to be mounted on supply or return. Connect harness to circulator and secure any excess conduit.
E.For heating only system piping, see Figure 3. Consult also I=B=R Installation Guides.
F.For space heating and domestic water heating with Alliance SL™ water heater (intermittent circulation only); install Alliance SL™ water heater as a separate heating zone. Refer to Alliance SL™
Installation, Operating and Service Instructions for additional information.
G.If this boiler is used in connection with refrigeration systems, the boiler must be installed so that the chilled medium is piped in parallel with the heating boiler using appropriate valves to prevent the chilled medium from entering the boiler, see Figure 4. Also consult I=B=R Installation and Piping Guides.
If this Boiler is connected to heating coils located in air handling units where they may be exposed to refrigerated air, the boiler piping must be equipped
Figure 4: Recommended Piping for Combination Heating & Cooling (Refrigeration) Systems
with flow control valves to prevent gravity circulation of boiler water during the operation of the cooling system.
H.Use a boiler bypass if the boiler is to be operated in a system which has a large volume or excessive radiation where low boiler water temperatures may be encountered (i.e. converted gravity circulation system, etc.).
Install a pipe tee at the boiler return along
with a second tee in the supply piping as shown in Figure 3. The bypass should be the same size as the supply and return lines with valves located in the bypass and supply outlet as illustrated in Figure 3 in order to regulate water flow to maintain higher boiler water temperatures.
Set the
Adjust the valves to provide 180° to 200°F supply water temperature. Opening the boiler supply valve will raise the system temperature, while opening the
I.A hot water boiler installed above radiation level must be provided with a low water cutoff device as part of the installation.
If a low water
The minimum safe water level of a hot water boiler is just above the highest water containing cavity of the boiler; that is, a hot water boiler must be full of water to operate safely.
Refer to Section VI for low water
J.If it is required to perform a long term pressure test of the hydronic system, the boiler should first be isolated to avoid a pressure loss due to the escape of air trapped in the boiler.
