OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 18 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 2: INSTALLATION
Figure 2-8: Dual Inlets
2.5.4 Sequencing Isolation Valve
Centurion Water Heaters with Water Heater Management (WHM) will arrive with the actuator-
controlled Sequencing Isolation Valve, packed separately within the shipping container.
If installation is required, see
Section 2.13: Sequencing Isolation Valve Installation
. See
Section
Recommendations for WHM Operation
and
SECTION 8: Water Heater Management
for
more information on implementing WHM.
NOTE:
Sequencing Isolation Valves are required in a multi-unit configuration.
2.6 Temperature and Pressure Relief Valve Installation
An ASME rated Temperature and Pressure Relief Valve is supplied with each Centurion Water
Heater. The valve setpoint is 150 psig (1034 kPa) at 210°F (98.9°C). The relief valve is installed
on the hot water outlet of the Water Heater, as shown below. A suitable pipe joint compound
should be used on the threaded connections. Any excess should be wiped off to avoid getting
any joint compound into the valve body. No valve is allowed between the relief valve and the
heat exchanger.
The relief valve must be piped to
within 12 inches (30.5 cm)
of the floor to prevent injury in the
event of a discharge. No valves, restrictions, or other blockages are allowed in the full port
discharge line.
In multiple unit installations the discharge lines must
NOT
be manifolded together. Each must
be individually run to a suitable discharge location.
Figure 2-9: Temperature and Pressure Relief Valve Location
TEMPERATURE & PRESSURE
RELIEF VALVE
3” HOT WATER OUTLET
BUILDING RECIRCULATION
INLET (WARMER WATER)
COLD WATER INLET
(COOLER WATER)
