Relief Valve; Heating System Piping - RBI Spectrum series Installation And Operation Instructions Manual

Relief Valve

Pipe the discharge of the pressure relief valve to prevent scalding in
the event of a discharge, see Figure 4. The discharge piping must be
sized the same as the pressure relief valve outlet and installed to allow
complete drainage of both the relief valve and the discharge piping.
Figure 4
1", 25 mm
Never install any type of valve between the boiler/water
heater and the relief valve or an explosion causing
extensive property damage, severe personal injury or
death may occur!
Flow Switch
The flow switch supplied with the boiler/water heater must
be wired to the terminal strip in the control panel to prevent the
boiler from firing unless there's adequate water flow through the
unit. The flow switch must be installed in the supply piping adjacent
to the boiler outlet connection.
Failure to properly install the flow switch may result
in damage to the boiler/water heater heat exchanger
voiding the warranty!

HEATING SYSTEM PIPING

General Piping Requirements
All heating system piping must be installed by a qualified 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.
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Finned copper tube gas boilers & water heaters – Boiler Manual
RIOM-57
The 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
The supply and return connections should be sized to suit the
system, see Table 6.
Table 6
Supply and Return Pipe Sizing
Model Size Supply Size
100 thru 400 1 1/2" NPT
Pump Requirements
This low mass boiler requires a continuous minimum water flow
for proper operation. The boiler pump must be sized to overcome
the head loss of the boiler and the near piping in order to achieve
the required temperature rise. Table 7 and 8 provides the heat
exchanger pressure drop and temperature rise figures.
The temperature rise across the boiler must never exceed 30°f,
16.7°C. A pump delay is installed, the pump delay turns the pump
on each time the burners fire and runs the pump up to 10 minutes
after the call for heat is satisfied.
A temperature rise outside of the range listed in Tables
7 or 8 indicates that the flow rate through the heat
exchanger is incorrect which will damage the heat
exchanger voiding the warranty!
The maximum allowable flow rate through a Spectrum
boiler with copper heat exchanger is 92 GPm,
5.8 L/s (2-pass heat exchanger) and 46 GPm,
2.9 L/s (4-pass heat exchanger).
Low Water Cutoff
If a boiler is installed above any radiation elements it must be fitted
with a low water cutoff device.
Refer to wiring diagram supplied with the boiler/water heater for
proper wiring connections.
Expansion Tank
An expansion tank or other means to control thermal expansion
must be installed in the heating system. An expansion tank must
be installed close to the boiler on the suction side of the system
pump.
Primary/Secondary Piping
Boilers connected to heating systems using zone valves, zone pumps,
or systems that have excessive flow rates or return water temperatures
less than 110°f, 43°C must be isolated from these systems to protect
the boiler.
Return Size
1 1/2" NPT