Lochinvar EGS-I&S-01 Installation & Service Manual page 7

4. NEVER OPERATE THE WATER HEATER
WITHOUT FIRST BEING CERTAIN THAT IT
IS FILLED WITH WATER.
INSTRUCTIONS FOR
BOILER CONNECTIONS
The Single-wall Indirect connection labeled "To Boiler
Return" should be piped to the boiler return piping as close
to the boiler as possible and especially after any flow control
or check valves in the space heating return piping. The use
of a union and a shut-off valve is recommended. The use of
a flow control or check valve is required to prevent back
flow through the water heater during operation of the space
heating system. Pipe and fittings between the boiler and
Single-wall Indirect should be ¾" diameter or larger.
CAUTION
Maximum boiler water supply temperature to the
indirect heat exchanger must not exceed 240°F
(116°C).
CONNECT WATER BOILER
SUPPLY PIPING
1. For a space heating system that utilizes
ZONE VALVES, refer to Figure 1. The Single-
wall Indirect connection labeled "FROM BOILER
SUPPLY"should be piped to the boiler supply
piping. Mount the circulator making sure the flow
arrow points toward the water heater. The use of
Shut-off valves and unions are recommended for
future service convenience. The use of an air
separator and vent is recommended to eliminate air
in the system. Pipe and fittings between the boiler
and Single-wall Indirect must be ¾" diameter or
larger.
Figure 1 - Water Boiler Piping with Zone Valves
2. For a space heating system that utilizes CIRCULATORS,
refer to Figure 2. The Single-wall Indirect connection
labeled "FROM BOILER SUPPLY" should be piped to
the boiler supply piping. Mount the circulator making
sure the flow arrow points toward the water heater. The
use of shut-off valves and unions are recommended for
future service convenience. The use of an air separator
and vent is recommended to eliminate air in the system.
Pipe and fittings between the boiler and Single-wall
Indirect must be ¾" diameter or larger.
Figure 2 - Water Boiler Piping with Circulators
CONNECT STEAM BOILER
SUPPLY PIPING
Figure 3 represents a typical steam boiler connection
diagram. Refer to the boiler installation manual or contact
the boiler manufacturer for an appropriate piping diagram.
The use of a union, shut-off valves, and a drain valve is
recommended for future service convenience. The use of
an in-line "Y"-style strainer is required to prevent
accumulation of sludge in the water heater's coil.
Figure 3 – Typical Steam Boiler Connections
(connections available below the water line)
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EGS-I&S-01