Heating System Piping - RBI LCD Series Installation & Operation Manual

Page 14
Freeze Protection
This boiler/water heater is CSA designed certified for
outdoor installation. Outdoor installations in areas where
the danger of freezing exists are not recommended
unless proper freeze protection is provided. If the unit
is to be installed in such an area the following
precautions MUST be observed:
1. A continuous flow of water through the boiler/water
heater MUST be maintained! The pump responsible
for flow through the boiler/water heater must run
continuously!
2. An ethylene glycol/water mixture suitable for the
minimum temperature that the unit will be exposed
to must be used. The pump must be capable of
producing 15% more flow and overcoming a 20%
increase in head loss. Domestic water systems must
be isolated from the water heater by the use of a
heat exchanger or other approved method.
3. If the boiler/water heater must be shut off for any
reason the electric, gas and water supplies MUST
be shut off and the unit and its pump completely
drained.
CAUTION: Improper outdoor installation of this
boiler/water heater can cause boiler failure voiding
the manufacturer's warranty!
Relief Valve
Pipe the discharge of the pressure relief valve to prevent
scalding in the event of a discharge, see Figure 10. 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 10 - Relief Valve Piping
LCD INSTALLATION AND OPERATION INSTRUCTIONS
WARNING: 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.
CAUTION: 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 when required, 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.
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 piping should be sized to suit the
system. The supply and return connection sizes are
listed in Table 7.
Table 7 - Supply & Return Connection Sizes
Model Size
225 thru 300 1-1/2" NPT
400 thru 2300 2-1/2" NPT
Pump Requirements
This low mass boiler requires a continuous minimum
water flow for proper operation. The 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 6 provides the heat exchanger
pressure drop and temperature rise figures.
Supply Return
1-1/2" NPT
2-1/2" NPT