AERCO AM Series Boiler User Manual - Manual (Page 129)

AM Series Boilers and Water Heaters
CHAPTER 8 – SPARE PARTS
OMM-0100_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 129 of 156
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6.1.3 Control Board Replacement
The AM Series multi-
burner units are configured to be driven by one control board (named
Burner 1 (Master)). On this board are connected all external devices such as: room thermostat,
outdoor sensor, pump commands, LWCO, and some internal safety devices such as blocked
drain magnetic switch, flue blocked pressure switch, etc. If the Burner 1 control board fails, the
complete unit stops functioning. If installer does not have a spare replacement part, the burner
control board from one of the other burners may be used to replace the Burner 1 (master)
control board in order to resume the function of the unit. To do so, perform the following:
Replacing the Burner 1 (Master) Control Board
1. Turn off all electrical power to the unit.
2. Follow the steps in Section 6.1.15 to remove the front cover.
3. Disconnect plug “B” (plug coming from display) from plug “A” (plug coming from “Burner 1
(Master).
4. Disconnect all other plugs from the Burner 1 (Master) control board.
5. Loosen screws “C” and “D” (Figure 14-13) and remove the Burner 1 (Master) control board
from the unit.
Figure 6-12: Changing the Display Connections for Each Burner
6. Repeat step 5 above to remove another control board from its location.
7. Install this control board to the location where the Burner 1 (Master) control board was
installed, and reconnect all plugs to this board.
8. Locate Switch “B” (“S4”)
per figure 6-12, and move from OFF (down) to ON (up) position.