OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 17 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 2: INSTALLATION
2.5.2 Test Hose Connection
A test hose must be connected from the drain valve on the hot water outlet to the floor drain.
This is
required
for startup and testing. The test hose diameter should be a minimum of 3/4"
(1.9 cm).
2.5.3 Dual Inlet Return Piping
The standard dual-inlet connections
allow Centurion Water Heaters to be configured with a
separate cooler return temperature zone, rather than blending high and low return temperature
zones. Utilizing the dual return capability, these Water Heaters can take further advantage of
the
unit’s condensing capabilities. When configured in this way, thermal efficiency can improve
by up to 6% (based on an 80 °F (26.7 °C) minimum return water temperature at full fire).
To use the recirculation inlet, pipe the warmer building return water to the building recirculation
(upper) inlet and the cold domestic inlet water to the lower inlet.
Contact your PVI representative for additional information.
DRAIN VALVE
(Connect Test
Hose Here)
HOT
WATER
OUTLET
Figure 2-7: Test Hose Location
