Boiler System Piping - Lochinvar 000 - 2 Installation And Service Manual

Figure 24A - Stand Alone Operation - Models 985,000 -
2,065,000 Btu/hr Only
Figure 24B - Remote On/Off Boiler or Water Heater -
Models 985,000 - 2,065,000 Btu/hr Only
Figure 24C - Two-Stage (High/Low Fire) Boiler or Water
Heater - Models 985,000 - 2,065,000 Btu/hr Only
Figure 24D - Field-Installed Safety Devices - Models
985,000 - 2,065,000 Btu/hr Only
Installation and
Service Manual

BOILER SYSTEM PIPING

The drawings in this section show typical boiler piping
installations. Before beginning the installation, consult local
codes for specific plumbing requirements. Be sure to provide
unions and valves at the boiler inlet and outlet so it can be
isolated for service. You must install an air separation device in
the installation piping to eliminate trapped air in the system.
Locate a system air vent at the highest point in the system. The
system must also have a properly sized expansion tank
installed. Typically, an air charged diaphragm-type
compression tank is used. You must install the expansion tank
close to the boiler and on the suction side of the system pump
to ensure proper operation.
CAUTION: This boiler system should not
be operated at less than 12 PSIG.
Provide suitable hangers or floor stands to support hot water
piping. The boiler alone should not support hot water piping.
Copper pipe systems are subject to considerable expansion and
contraction. Rigid pipe hangers could allow the pipe to slide in
the hanger resulting in noise transmitted into the system. Use
padding on rigid hangers installed with a copper system. Pipe
the boiler pressure relief valve to a suitable floor drain. See the
relief valve section in this manual.
CAUTION: A leak in a boiler "system" will
cause the "system" to intake fresh water
constantly, which will cause the tubes to
accumulate a lime/scale build up. This will cause
a non-warrantable failure.
General Plumbing Rules
1. Check all local codes.
2. For serviceability of boiler, always install unions.
3. Always pipe the pressure relief valve to an open drain.
4. Locate system air vents at the highest point of system.
5. Expansion tank must be installed near the boiler and on the
suction side of the pump.
6. Support all water piping.
Water Connections: Heating
Boilers Only
Inlet and outlet water connections on models 495,000 -
745,000 Btu/hr have 2" NPT and on models 985,000 -
2,065,000 Btu/hr the inlet and outlet connections are
2 1/2" NPT.
Note: Field-installed reducing bushings may decrease flow
resulting in boiler noise or flashing to steam.
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