Test Hose Bib Connection; System Recirculation Loop - Watts Aerco Innovation 800 User Manual

Innovation Hot Water Hot Water Boiler User Manual

2.6 TEST HOSE BIB CONNECTION

A Test Hose Bib connection, upstream of the shut off valve on the hot water outlet, is required
for startup and testing (Figure 2-4). The pipe diameter should be a minimum of 3/4" (1.9 cm).
The Test Hose Bib cannot be omitted.
HOT
WATER
OUT

2.7 SYSTEM RECIRCULATION LOOP

The System Recirculation Loop Assembly is located inside the unit enclosure at the rear of the
unit. In order to access this assembly, the right rear middle panel must be removed. Refer to
Figure 2-5. This assembly contains a recirculation pump that connects the upper hot water
outlet to the 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.
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CHAPTER 2 – INSTALLATION
Figure 2-4. Test Hose Bib Location
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
- INTERNATIONAL
TEST
HOSE BIB
TEST HOSE
TO DRAIN
OMM-0120_0A
GF-128-I