AERCO RECON 1000 - Manual (Page 24)

RECON Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
Page 24 of 178 AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 OMM-0103_0A
PRI: 10/28/2014 Phone: 800-526-0288 GF-147
2.7 SYSTEM RECIRCULATION LOOP
The RECON Recirculation Loop Assembly is located inside the unit enclosure on the right side
of the unit. Remove the upper and lower right side panels to access this assembly. Refer to
Figure 2-6. This assembly contains a recirculator pump which connects between the upper hot
water outlet and lower cold water inlet of the unit’s heat exchanger. The purpose of this loop is
to provide feed-forward (FFWD) temperature control by mixing a portion of the hot water outlet
with the cold water inlet of the unit. Temperature sensors located in the hot water outlet and cold
water inlet provide temperature data to the C-More Control System. The Control System utilizes
this data to modulate the fire rate (Air/Fuel Valve position) to precisely maintain the hot water
outlet temperature at the selected setpoint temperature.
Figure 2-6: Recirculation Loop Components – Right Side View, Covers Removed
P&T RELIEF VALVE
RECIRCULATION PUMP
RECIRCULATION LOOP PIPING
RIGHT SIDE VIEW –
COVERS REMOVED
BUILDING
RECIRCULATION
INLET