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• Install radiation units (panels, radiators or cabinets) and
supply and return mains fi rst then make connections at
boiler.
• Verify clean water supply is available when connecting
cold water supply to water valve. Install sand strainer at
pump when water supply is from well or pump.
• Provide low water cutoff device when boiler is installed
above radiation level or as required by the Authority
having jurisdiction, either provide as part of boiler
or at time of boiler installation. Periodic inspection
is necessary, as is fl ushing of fl oat type devices, per
manufacturers specifi c instructions.
• Boiler used in connection with refrigeration systems shall
be installed so chilled medium is piped in parallel with
heating boiler with appropriate valves to prevent chilled
medium from entering heating boiler. See
Figure 5
.
• Boiler connected to heating coils located in air handling
units exposed to refrigerated air circulation, piping
system shall be equipped with fl ow control valves or
other automatic means to prevent gravity circulation of
boiler water during cooling cycle.
INSTALLATION SYSTEM PIPING
Figure 5
- Piping Arrangements For Boiler When
Used In Connection With Refrigeration
System
Low Design Water Temperature Systems (Below
140°F) And Large Water Content Systems
Condensation is corrosive and can eventually cause severe
damage to boiler and venting system.
• Minimum design return water temperature to prevent
condensation in boiler and venting is 120°F. Minimum
high limit setting is 140°F.
• Boiler used in heating systems where design water
temperatures below 140°F are desired (e.g. radiant fl oor
heating), a 3-way or 4-way mixing valve or suitable
alternative is required to prevent low temperature return
water from entering boiler. When using mixing valve,
follow manufacturer’s installation instructions.
• Boiler connected to system having large water content
(such as former gravity system), suggest use of bypass
piping. See
Figure 6
.
Figure 6
- Bypass Piping