AERCO Innovation (G-13-1854 and above) - Manual (Page 45)

Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 3 – OPERATION
OMM-0078_0J
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Page 45 of
196
GF-128
Phone: 800-526-0288
PRI: 11/22/2013
3.9 START SEQUENCE
When the Control Box ON/OFF switch is set to the ON position, it checks all pre-purge safety
switches to ensure they are closed. These switches include:
• Safety Shut-Off Valve Proof of Closure (POC) switch
• Low Water Level switch
• High Water Temperature switch
• High Gas Pressure switch
• Low Gas Pressure switch
• Blower Proof switch
NOTE
The downstream Low Gas Pressure switch is not checked prior to starting
the pre-purge.
If all of the above switches are closed, the READY light above the ON/OFF switch will light and
the unit will be in the Standby mode.
When there is a demand for hot water, the following events will occur:
NOTE
If any of the Pre-Purge safety device switches are open, the appropriate
fault message will be displayed. Also, if the required conditions are not
observed at any point during the start sequence, appropriate messages will
be displayed and the unit will go into fault mode.
1. The DEMAND LED status indicator will light.
2. The unit checks to ensure that the Proof of Closure (POC) switch in the downstream
Safety Shut-Off Valve (SSOV) is closed. See Figure 3-3 for SSOV location.
Figure 3-3. SSOV Location (INN1060 Gas Train)
GAS INLET
MANUAL
SHUTOFF
VALVE
SSOV