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Finned copper tube gas boilers & water heaters – Boiler Manual
13
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Figure 8
Futera III Piping
HEATING SYSTEM PIPING
General Piping Requirements
All heating system piping must be installed by a qualifi ed technician
in accordance with the latest revision of the ANSI/ASME Boiler
and Pressure Vessel Code, Section IV, and ANSI/ASME CSD-1,
Standard for Controls and Safety Devices for Automatically Fired
Boilers. All applicable local codes and ordinances must also be
followed. A minimum clearance of
1 in
,
25 mm
must be maintained
between heating system pipes and all combustible construction.
All heating system piping must be supported by suitable hangers
not the boiler. Th e thermal expansion of the system must be
considered when supporting the system. A minimum system
pressure of
12 psig
,
82.7 kPa
must be maintained.
Heating Boiler Piping Connections
Th e supply and return connections should be sized to suit the system,
see Table 6.
Table 6
Supply & Return Pipe Sizing (Flanged)
Model Size
Supply Size
Return Size
500 thru 1000
2”
2”
1250 thru 2000
2 1/2”
2 1/2”
Pump Requirements
Th is low mass boiler requires a continuous minimum water fl ow
for proper operation. Th e system pump must be sized to overcome
the head loss of the boiler and the heating system in order to achieve
the required temperature rise. Table 7 provides the heat exchanger
pressure drop and temperature rise fi gures. Th e temperature rise
across the boiler must never exceed
35°F
,
19.4°C
. Th e adjustable
pump delay turns the pump on each time the burner fi res and runs
the pump for 20 to 600 seconds aft er the call for heat is satisfi ed.
